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Research on the Controllable Growth Mechanism and Structural Characterization Methods of Single-Walled Carbon Nanotubes 认领 引用
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作者 Jingchun Zhang Wenqing Shen Zhikun Chen 《Journal of Electronic Research and Application》 2026年第6期33-39,共7页
As a typical one-dimensional carbon nanomaterial,single-walled carbon nanotubes(SWCNTs)possess a unique electronic structure,excellent mechanical properties,and outstanding thermal and electrical conductivity,showing ... As a typical one-dimensional carbon nanomaterial,single-walled carbon nanotubes(SWCNTs)possess a unique electronic structure,excellent mechanical properties,and outstanding thermal and electrical conductivity,showing important application value in cutting-edge fields such as nanoelectronic devices and composite materials.Structure determines properties,which is the core foundation for the application of SWCNTs.Their physicochemical properties are significantly affected by microstructural parameters such as diameter and chirality.Therefore,in-depth analysis of the controllable growth mechanism and research on precise structural characterization methods are of great significance for promoting the large-scale application of SWCNTs. 展开更多
关键词 Single-walled carbon nanotubes Controllable growth mechanism Structural characterization methods Research progress
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Prospects of sea buckthorn(Hippophae rhamnoides L.)polysaccharides:preparation,structural characterization,and bioactivities diversity 认领 引用 被引量：1
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作者 Shuyuan Shi Ruiyun Wu +4 位作者 Zixin Han Yu Sun Pinglan Li Fazheng Ren Nan Shang 《Food Science and Human Wellness》 SCIE CAS CSCD 2025年第1期11-28,共18页
Sea buckthorn(Hippophae rhamnoides L.)is a natural homologous substance of medicine and food.Polysaccharide,as one of its primary active components,has very superior biological activity and can be used as a dietary su... Sea buckthorn(Hippophae rhamnoides L.)is a natural homologous substance of medicine and food.Polysaccharide,as one of its primary active components,has very superior biological activity and can be used as a dietary supplement for functional foods,with good commercial prospects.Although initial progress has been made in the study of sea buckthorn polysaccharides,related studies have been fragmented and lacked systematic and generalization.This manuscript presents a critical analysis and systematic summary of the extraction and purification methods,structural characterization and physicochemical properties,biological activity and potential mechanisms,and structure-activity relationships of sea buckthorn polysaccharides.Accumulating evidence has indicated that sea buckthorn polysaccharides,which were widely prepared by water extraction and column chromatography purifications,exhibited exhibit superior biological activities in vitro and in vivo,including antioxidant,immunomodulatory,anti-inflammatory,hepatorenal protective,antibacterial,antiviral,and prebiotic activities.After analysis,it was concluded that there is a correlation between the relevant activities of sea buckthorn polysaccharides and that the structure of sea buckthorn polysaccharides has a great influence on their biological activity.We reviewed the challenges and limitations of sea buckthorn polysaccharides,summarized the critical aspects,and provided suggestions for potential breakthroughs in the research and application of sea buckthorn polysaccharide. 展开更多
关键词 Sea buckthorn Polysaccharides Preparation Structural characterization Bioactivities
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Structural characterization of blueberry fruit polysaccharides and assessment of its hypolipidemic and immunological activity 认领 引用 被引量：1
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作者 Chuyan Wang Yuqi Qin +4 位作者 Xiaoao Cui Dongsheng Wang Yexian Hu Liuqing Yang Wei Lan 《Food Science and Human Wellness》 SCIE CAS CSCD 2025年第4期1360-1368,共9页
In this study,polysaccharides were extracted from blueberry fruit(BFP)and isolated to 3 components(BFP-1,BFP-2 and BFP-3).The molecular weight,monosaccharide composition,characteristic groups,microscopic morphology,an... In this study,polysaccharides were extracted from blueberry fruit(BFP)and isolated to 3 components(BFP-1,BFP-2 and BFP-3).The molecular weight,monosaccharide composition,characteristic groups,microscopic morphology,and triple helical conformation of the polysaccharides were characterized using high performance permeation chromatography,high performance liquid chromatography,gas chromatographymass spectrometry,Fourier transform infrared spectrometer,scanning electron microscope and Congo red staining.Moreover,the hypolipidemic and immunological activities of the polysaccharides were also assessed.Results showed that the molecular weights of polysaccharides BFP-1,BFP-2,and BFP-3 were 5.547×104,5.671×104,and 3.951×104Da,respectively,the main monosaccharides were glucose(Glc),galactose(Gal)and arabinose(Ara),but BFP-3 was mainly composed of galacturonic acid(Gal A),Glc,Gal,and Ara.The backbone of BFP-1 was→4)-Glcp-(1→,which branches to Ara and xylose(Xyl)residues,while the backbone of BFP-2 was→5)-Araf-(1→,which branches to Xyl,Glc,rhamnose(Rha)and Gal residues,in particularly,BFP-3 has a more complex branching with a→3,6)-Galp-(1→)backbone,the side chain is dominated by Araf-(1→).Blueberry polysaccharides are pyran-type polysaccharides withα-glycosidic bonds,and BFP-1 has a typical triple-helical structure.The activity assay revealed that the binding of BFP-3 to sodium glycylcholate hydrate and sodium taurocholate was 79.95%and 78.50%,respectively,indicating that it had better hypolipidemic activity than the others.Immunoactivity assay showed that BFP promoted NO secretion through activating the NF-κB signalling pathway in RAW264.7 cells,which played a role in enhancing the immune function of the organism.These findings may provide a reference for the development and application of blueberry polysaccharides in functional food and medicine. 展开更多
关键词 Blueberry fruit polysaccharides Structural characterization Hypolipidemic Immunological activity
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Panax notoginseng polysaccharides: a review focusing on the extraction, isolation, structural characterization, biological activities, and applications 认领 引用 被引量：1
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作者 Jiaqi Huang Yuheng Zhao +6 位作者 Mengyao Wang Xiaojin Tian Dianxin Cui Qilong Wang Xue Li Honghua Wu Wenzhi Yang 《Acupuncture and Herbal Medicine》 CAS CSCD 2025年第1期23-35,共13页
Panax notoginseng is a traditional Chinese medicine containing various constituents,including the saponins,polysaccharides,polyacetylenes,amino acids,etc.It has beneficial functions,such as the anti-inflammatory,antit... Panax notoginseng is a traditional Chinese medicine containing various constituents,including the saponins,polysaccharides,polyacetylenes,amino acids,etc.It has beneficial functions,such as the anti-inflammatory,antitumor,hepatoprotective,and anti-aging effects.Among these,P.notoginseng polysaccharides(PNPs)have been exploited because of their extensive pharmacological effects,being ranked as one of the current research hotspots,especially for the functional foods and medical practice.In this review,the literature related to PNPs in the past 20 years was surveyed and analyzed using both the China National Knowledge Infrastructure(CNKI)and Web of Science(WOS)databases.The visualization diagram shows that current studies on PNPs mainly focus on the antioxidant and immunomodulatory activities and structural characterization.In addition,the extraction,separation,purification,chemical analysis,structural characteristics,bioactivities,and applications of PNPs are outlined,in detail,aimed to provide valuable information for the further study,development,and utilization regarding PNPs. 展开更多
关键词 Biological activity Extraction Isolation Panax notoginseng polysaccharides Structural characterization
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Structural characterization and immunological function of a neutral polysaccharide from Areca catechu L.kernels 认领 引用
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作者 Jing Zhang Xuejie Feng +4 位作者 Jiahui Dai Shiping Wang Xiaoning Kang Wenting Dai Jianbang Ji 《Tropical Plants》 CSCD 2025年第1期223-235,共13页
Areca nut kernels are the byproduct of areca nut processing.Some of the major bioactive components of the areca nut are polysaccharides.Polysaccharides are known to exert numerous biological activities.Thus,polysaccha... Areca nut kernels are the byproduct of areca nut processing.Some of the major bioactive components of the areca nut are polysaccharides.Polysaccharides are known to exert numerous biological activities.Thus,polysaccharides isolated from areca nut kernels may be clinically valuable.To determine the medicinal value of areca nut kernel polysaccharides(AKP),ultrasonic-assisted extraction,ethanol precipitation,and dialysis were used for separation and purification.SEM,XRD,FTIR,and NMR were used for structural characterization and RAW264.7 macrophages were used for in vitro immune activity assessment.The AKP were isolated was a neutral polysaccharide,and the molecular weight(Mw)was 6.95×105Da,primarily composed of mannose(58.7%)and galactose(33.6%);the main chain of AKP is→4)-β-D-Manp-(1→,and the branched chain was mainly ofα-D-Galp-(1→attached to the O-6 position of→4,6)-β-D-Manp-(1→.Cell experiments show that AKP(20μg/mL)exerts its immune function via the TLR4/NF-κB signaling pathway regulation,decreasing TLR4,P65,IκB-α,and MyD88,and reducing the release of TNF-α,NO,IL-6,and IL-1β.In addition,AKP immune activity might be ascribed to its high Mw and rich monosaccharide composition.This study offers a solid scientific foundation for the development of AKP for wide clinical application. 展开更多
关键词 structural char Immunological function Neutral polysaccharide Structural characterization areca nut kernels separation purificationsemxrdftirand areca nut kernel polysaccharides akp ultrasonic assisted Areca catechu kernels
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Structural characterization and anti-inflammatory activities of novel polysaccharides obtained from Pleurotus eryngii 认领 引用 被引量：4
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作者 Han Wang Sai Ma +5 位作者 Alfred Mugambi Mariga Qiuhui Hu Qian Xu Anxiang Su Ning Ma Gaoxing Ma 《Food Science and Human Wellness》 SCIE CAS CSCD 2024年第5期3031-3042,共12页
Natural polysaccharides named PEP-0.1-1,PEP-0-1 and PEP-0-2 from edible mushroom species Pleurotus eryngii were obtained in the present study.Results showed that molecular weights of these polysaccharides were 3235,20... Natural polysaccharides named PEP-0.1-1,PEP-0-1 and PEP-0-2 from edible mushroom species Pleurotus eryngii were obtained in the present study.Results showed that molecular weights of these polysaccharides were 3235,2041 and 23933 Da,respectively.Further,structural characterization revealed that PEP-0.1-1 had a→4-α-D-Glcp-1→backbone and contained→4)-α-D-Glcp and→4)-β-D-Glcp reducing end groups.PEP-0-1 backbone contained→4-α-D-Glcp-1→and→6-α-3-O-Me-D-Galp-1→,and the side chains containedα-D-Glcp,β-D-Manp-1→andα-D-Glcp-3→.However,PEP-0-2 backbone consisted of→4-α-DGlcp-1→and→6-α-3-O-Me-D-Galp-(1→6)-α-D-Galp-1→while the side chains containedα-D-Glcp andβ-D-Manp-1→.Biological activity analysis was then carried out and found that all these polysaccharides could significantly suppress the relative mRNA expression of toll-like receptor 4,nitric oxide(NO),tumor necrosis factor-α,interleukin(IL)-1βand IL-6 in lipopolysaccharide(LPS)-induced inflammation of RAW264.7 cells,as well as the over secretion of the above cell cytokines.Moreover,Western blotting analysis revealed that all these purified fractions displayed significant inhibition effects on the expression of c-Jun N-terminal kinases protein induced by LPS in mitogen activated protein kinase pathway,along with the relieving on the inhibition effect of LPS on IκB-αprotein expression.In summary,the information generated by the present study could provide a theoretical basis for the exploration of novel healthy food materials from edible mushroom with antiinflammation activities. 展开更多
关键词 Pleurotus eryngii Polysaccharides Structural characterization Anti-inflammatory activity
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Physicochemical, structural characterization, and antioxidant activities of chondroitin sulfate from Oreochromis niloticus bones 认领 引用 被引量：4
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作者 Jun Yang Mingyue Shen +3 位作者 Ting Wu Xianxiang Chen Huiliang Wen Jianhua Xie 《Food Science and Human Wellness》 SCIE CAS CSCD 2023年第4期1102-1108,共7页
In this study,chondroitin sulfate was extracted from Oreochromis niloticus bones(OCS)and isolated to three fractions(OCS-1,OCS-2,and OCS-3).The physicochemical properties and structure characterization including monos... In this study,chondroitin sulfate was extracted from Oreochromis niloticus bones(OCS)and isolated to three fractions(OCS-1,OCS-2,and OCS-3).The physicochemical properties and structure characterization including monosaccharide,disaccharide compositions,molecular weight(Mw)of OCS were determined by HPAEC,HPLC-SAX,HPGPC,FT-IR spectra,and 1D/2D NMR.Moreover,their thermal properties,crystalline structure,and microstructure were also analyzed.Results showed that their Mw were between 10 kDa and 50 kDa.CS-6 was the predominant disaccharide unit in four OCS,and the CS-4/CS-6 ratios were close to CS from shark cartilage.Besides,the results of antioxidant activity showed that different fractions of OCS had a distinct DPPH radical,hydroxyl radical,and ABTS+radical scavenging activity.OCS-1 has the highest scavenging activities in DPPH and hydroxyl radical compared with other fractions,which showed a higher medicinal value.Those findings may lay some theoretical basis for the potential application development of OCS. 展开更多
关键词 Oreochromis niloticus by-products Chondroitin sulfate Structural characterization Antioxidant
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Structural Characterization of Lignins Isolated from Caragana sinica Using FT-IR and NMR Spectroscopy 认领 引用 被引量：3
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作者 XIAO Ling-ping SHI Zheng-jun +2 位作者 XU Feng SUN Run-cang Amar K Mohanty 《光谱学与光谱分析》 SCIE EI CAS CSCD 北大核心 2011年第9期2369-2376,共8页
In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were c... In order to efficiently explore and use woody biomass,six lignin fractions were isolated from dewaxed Caragana sinica via successive extraction with organic solvents and alkaline solutions.The lignin structures were characterized by Fourier transform infrared spectroscopy(FT-IR) and 1D and 2D Nuclear Magnetic Resonance(NMR).FT-IR spectra revealed that the "core" of the lignin structure did not significantly change during the treatment under the conditions given.The results of 1H and 13C NMR demonstrated that the lignin fraction L2,isolated with 70% ethanol containing 1% NaOH,was mainly composed of β-O-4 ether bonds together with G and S units and trace p-hydroxyphenyl unit.Based on the 2D HSQC NMR spectrum,the ethanol organosolv lignin fraction L1,extracted with 70% ethanol,presents a predominance of β-O-4′ aryl ether linkages(61% of total side chains),and a low abundance of condensed carbon-carbon linked structures(such as ββ′,β-1′,and β-5′) and a lower S/G ratio.Furthermore,a small percentage(ca.9%) of the linkage side chain was found to be acylated at the γ-carbon. 展开更多
关键词 Caragana sinica Lignin Structural characterization FT-IR NMR
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Effects of structural characterizations on fragility functions of bridges subject to seismic shaking and lateral spreading 认领 引用 被引量：8
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作者 Scott J.Brandenberg Pirooz Kashighandi 《Earthquake Engineering and Engineering Vibration》 SCIE EI 2008年第4期369-382,共14页
This paper evaluates the seismic vulnerability of different classes of typical bridges in California when subjected to seismic shaking or liquefaction-induced lateral spreading. The detailed structural configurations ... This paper evaluates the seismic vulnerability of different classes of typical bridges in California when subjected to seismic shaking or liquefaction-induced lateral spreading. The detailed structural configurations in terms of superstructure type, connection, continuity at support and foundation type, etc. render different damage resistant capability. Six classes of bridges are established based on their anticipated failure mechanisms under earthquake shaking. The numerical models that are capable of simulating the complex soil-structure interaction effects, nonlinear behavior of columns and connections are developed for each bridge class. The dynamic responses are obtained using nonlinear time history analyses for a suite of 250 earthquake motions with increasing intensity. An equivalent static analysis procedure is also implemented to evaluate the vulnerability of the bridges when subjected to liquefaction-induced lateral spreading. Fragility functions for each bridge class are derived and compared for both seismic shaking （based on nonlinear dynamic analyses） and lateral spreading （based on equivalent static analyses） for different performance states. The study finds that the fragility functions due to either ground shaking or lateral spreading show significant correlation with the structural characterizations, but differences emerge for ground shaking and lateral spreading conditions. Structural properties that will mostly affect the bridges＇ damage resistant capacity are also identified. 展开更多
关键词 fragility functions bridge seismic response liquefaction lateral spreading structural characterization
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Structural characterizations andα-glucosidase inhibitory activities of four Lepidium meyenii polysaccharides with different molecular weights 认领 引用 被引量：2
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作者 Luan Wen Zhou-Wei Wu +3 位作者 Li-Wu Lin Abdulbaset Al-Romaima Xing-Rong Peng Ming-Hua Qiu 《Natural Products and Bioprospecting》 CSCD 2023年第1期568-576,共9页
Four polysaccharides(MCPa,MCPb,MCPc,MCPd)were obtained from Lepidium meyenii Walp.Their structures were characterized by chemical and instrumental methods including total sugar,uronic acid and protein content determi-... Four polysaccharides(MCPa,MCPb,MCPc,MCPd)were obtained from Lepidium meyenii Walp.Their structures were characterized by chemical and instrumental methods including total sugar,uronic acid and protein content determi-nation,UV,IR and NMR spectroscopy,as well as monosaccharide composition determination and methylation analy-ses.Four polysaccharides were a group of glucans with different molecular weights ranging from 3.12 to 14.4 kDa,and shared a similar backbone chain consisting of(1→4)-glucose linkages with branches attached to C-3 and C-6.Furthermore,bioactivity assay showed that MCPs had concentration-dependent inhibitory activity onα-glucosidase.MCPb(Mw=10.1 kDa)and MCPc(Mw=5.62 kDa)with moderate molecular weights exhibited higher inhibitory activ-ity compared with MCPa and MCPd. 展开更多
关键词 Lepidium meyenii Polysaccharide Molecular weight Structural characterization α-Glucosidase inhibition
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Structural characterization of three acidic polysaccharides from Opuntia dillenii Haw.fruits and their protective effect against hydrogen peroxide-induced oxidative stress in Huh-7 cells 认领 引用 被引量：1
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作者 Rui Liu Fangxin Chu +1 位作者 Zheng Yan Hanqing Chen 《Food Science and Human Wellness》 SCIE CAS CSCD 2024年第4期1929-1942,共14页
Three novel acidic polysaccharide fractions(OFPP-1,OFPP-2,OFPP-3)with different m olecular weights(803.7,555.1 and 414.5 k Da)were isolated from the peeled Opuntia dillenii Haw.fruits by alkali-extraction,graded alcoh... Three novel acidic polysaccharide fractions(OFPP-1,OFPP-2,OFPP-3)with different m olecular weights(803.7,555.1 and 414.5 k Da)were isolated from the peeled Opuntia dillenii Haw.fruits by alkali-extraction,graded alcohol precipitation and column chromatography.Structural analysis indicated that OFPPs were pectic polysaccharides consisting of rhamnose,arabinose and galactose residues.The backbone of OFPP-1 consisted of a repeating unit→6-α-D-Galp A-(1→2)-α-L-Rhap-(1→with T-α-D-Galp A-(1→6)-α-D-Galp A-(1→4)-α-D-Glcp-(1→,T-β-D-Xylp-(1→6)-α-D-Galp A-(1→4)-α-D-Glcp-(1→or T-α-D-Galp A-(1→3)-α-L-Araf-(1→as the side chains.The backbone of OFPP-2 consisted of a disaccharide repeating unit→2)-α-L-Rhap-(1→4)-β-D-Galp A-(1→with T-β-L-Araf-(1→as the branches substituted at the O-4 position of→2,4)-α-LRhap-(1→.Whereas the backbone of OFPP-3 was→2,4)-α-L-Rhap-(1→2)-α-L-Rhap-(1→3)-β-L-Araf-(1→or→2,4)-α-L-Rhap-(1→2)-α-L-Rhap-(1→4)-β-D-Galp A-(1→,which was branched at the O-4 position of→2,4)-α-L-Rhap-(1→.Moreover,these three polysaccharide fractions could protect Huh-7 cells against H2O2-induced oxidative stress to different extents by decreasing the MDA content and increasing the SOD,CAT,GSH-Px activities and the GSH level in the Huh-7 cells.These results suggest that OFPPs have the potential to be used as natural antioxidants. 展开更多
关键词 Opuntia dillenii Haw.fruits Polysaccharide Alkali extraction Structural characterization Oxidative stress
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Synthesis and structural characterization of macroporous bioactive glass 认领 引用 被引量：1
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作者 周智华 阮建明 +2 位作者 邹俭鹏 周忠诚 申雄军 《Journal of Central South University of Technology》 2007年第3期301-304,共4页
Porous sol-gel glass of CaO-SiO2-P2O5 system with macropores larger than 100 μm was prepared by adding stearic acid as pore former when the sintering was carried out at 700 ℃ for 3h.The sol-gel porous glass shows an... Porous sol-gel glass of CaO-SiO2-P2O5 system with macropores larger than 100 μm was prepared by adding stearic acid as pore former when the sintering was carried out at 700 ℃ for 3h.The sol-gel porous glass shows an amorphous structure. The diameter of the pore created by pore former varies from 100 to 300 μm, and macroporous glass has a narrow and small pore size distribution in mesoporous scale. The porosity and pore size of macroporous bioactive glass can be controlled. 展开更多
关键词 macroporous glass sol-gel method synthesis structural characterization
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One-pot synthesis and structural characterization of urea-isobutyraldehyde-formaldehyde resin 认领 引用 被引量：1
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作者 张一甫 曾幸荣 《Journal of Central South University》 SCIE EI CAS 2009年第1期80-84,共5页
Urea-isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of isobutyraldehyde to form... Urea-isobutyraldehyde-formaldehyde (UIF) resin was synthesized from urea, isobutyraldehyde, and formaldehyde using sulfuric acid as a catalyst by one pot method. The effects of molar ratios of isobutyraldehyde to formaldehyde (n(I)(F)) and aldehyde to urea (n(A)(U)) on the yield, hydroxyl value (vs KOH) and softening point of the resin were investigated. The structure of the resin was characterized by FT-IR, 1H-NMR and 13C-NMR. The results show that when the molar ratio of urea to isobutyraldehyde to formaldehyde (n(U)(I)(F)) is 1.0/3.0/3.0, the yield UIF resin is 67.1%, and the softening point and hydroxyl value are 88 ℃ and 37 mg/g, respectively. The FT-IR, 1H-NMR and 13C-NMR results show that the lactam is formed by aminomethylation from urea, isobutyraldehyde, and formaldehyde. 展开更多
关键词 urea isobutyraldehyde formaldehyde resin synthesis structural characterization
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Extraction,Isolation and Structural Characterization of Polysaccharides from a Red Alga Gloiopeltis furcata 认领 引用 被引量：4
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作者 YU Guangli HU Yannan YANG Bo ZHAO Xia WANG Peipei JI Guoli WU Jiandong GUAN Huashi 《Journal of Ocean University of China》 CAS 2010年第2期193-197,共5页
Three kinds of polysaccharides： GFW, GFH and GFA, were sequentially extracted from a red alga Gloiopeltisfurcata with 25℃ and 85℃ water, and 60℃ 4% NaOH water solution. Based on the defatted alga, the yields of th... Three kinds of polysaccharides： GFW, GFH and GFA, were sequentially extracted from a red alga Gloiopeltisfurcata with 25℃ and 85℃ water, and 60℃ 4% NaOH water solution. Based on the defatted alga, the yields of the polysaccharide were 57.9%, 2.5% and 2.6%, respectively. Their monosaccharide compositions, average molecular weights and structural characters were determined by gas chromatography （GC）, high performance liquid chromatography （HPLC）, fourier transform infrared spectroscopy （FTIR） or ^13C-NMR spectroscopy. The results showed that GFW, GFH and GFA were all composed of D-galactose （Gal） and 3,6-anhydro-L-galactose （AnG）, and particularly GFA also contained xylose （Xyl）. The average molecular weights of GFW, GFH and GFA were 22.6 kD, 26.5 kD and 49.8 kD, respectively, with the respective sulfate content 31.2%, 25.1% and 22.7%. The data of FTIR and ^13C-NMR confirmed the sulfate ester location at C6 ofgalactose. It is concluded that all the three polysaecharides extracted from Gloiopeltisfurcata were sulfated galactans, two being sulfated-agarose, and one being xylose-containing sulfated galactan. 展开更多
关键词 Gloiopeltisfurcata sulfated galactan extraction structural characterization
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A facile method for fabrication of nano-structured Ni-Al_2O_3 graded coatings: Structural characterization 认领 引用 被引量：1
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作者 Arash YAZDANI Taghi ISFAHANI 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第1期77-87,共11页
Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings w... Powder charges of micron-size Ni and Al2O3were utilized to deposit nano-structured Ni-Al2O3composite coatings on analuminum plate fixed at the top end of a milling vial using a planetary ball mill.Composite coatings were fabricated using powdermixtures with a wide range of Ni/Al2O3mass ratio varying from1:1to plain Ni.XRD,SEM and TEM techniques were employed tostudy the structural characteristics of the coatings.It was found that the composition of the starting mixture strongly affects the Al2O3content and the microstructure of the final coating.Mixtures containing higher contents of Al2O3yield higher volume fractions of theAl2O3particles in the coating.Though Ni-Al2O3composite coatings with about50%of Al2O3particles were successfully deposited,well-compacted and free of cracks and/or voids coatings included less than20%(volume fraction)of Al2O3particles which weredeposited from powder mixtures with Ni/Al2O3mass ratios of4:1or higher.Moreover,mechanical and metallurgical bondings arethe main mechanisms of the adhesion of the coating to the Al substrate.Finally,functionally graded composite coatings withnoticeable compaction and integrity were produced by deposition of two separate layers under identical coating conditions. 展开更多
关键词 metal matrix composite Ni-Al2O3 graded coating structural characterization
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Recent progress in molten salt synthesis of low-dimensional perovskite oxide nanostructures, structural characterization,properties, and functional applications: A review 认领 引用 被引量：10
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作者 Piaojie Xue Heng Wu +1 位作者 Yao Lu Xinhua Zhu 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2018年第6期914-930,共17页
Molten salt synthesis （MSS） method has advantages of the simplicity in the process equipment, versatile and large-scale synthesis, and friendly environment, which provides an excellent approach to synthesize high pu... Molten salt synthesis （MSS） method has advantages of the simplicity in the process equipment, versatile and large-scale synthesis, and friendly environment, which provides an excellent approach to synthesize high pure oxide powders with controllable compositions and morphologies. Among these oxides, perovskite oxides with a composition of ABO3 exhibit a broad spectrum of physical properties and functions （e.g. ferroelectric, piezoelectric, magnetic, photovoltaic and photocatalytic properties）. The downscaling of the spatial geometry of perovskite oxides into nanometers result in novel properties that are different from the bulk and film counterparts. Recent interest in nanoscience and nanotechnology has led to great efforts focusing on the synthesis of low-dimensional perovskite oxide nanostructures （PONs） to better understand their novel physical properties at nanoscale. Therefore, the low-dimensional PONs such as perovskite nanoparticles, nanowires, nanorods, nanotubes, nanofibers, nanobelts, and two dimensional oxide nanostructures, play an important role in developing the next generation of oxide electronics. In the past few years, much effort has been made on the synthesis of PONs by MSS method and their structural characterizations. The functional applications of PONs are also explored in the fields of storage memory, energy harvesting, and solar energy conversion. This review summarizes the recent progress in the synthesis of low-dimensional PONs by MSS method and its modified ways. Their structural char- acterization and physical properties are also scrutinized. The potential applications of low-dimensional PONs in different fields such as data memory and storage, energy harvesting, solar energy conversion, are highlighted. Perspectives concerning the future research trends and challenges of low-dimensional PONs are also outlined. ~ 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science ＆ Technology. 展开更多
关键词 Low-dimensional perovskite nanostructures Molten salt synthesis Structural characterization Physical properties Functional applications
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Structural characterization and immunostimulatory activity of a water-soluble polysaccharide from abalone(Haliotis discus hannai Ino)muscle 认领 引用 被引量：3
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作者 Linfan Shi Gengxin Hao +2 位作者 Jun Chen Junling Wang Wuyin Weng 《Food Science and Human Wellness》 SCIE CAS CSCD 2023年第2期495-502,共8页
A water-soluble polysaccharide from abalone muscle(AMPP)was isolated.The contents of carbohydrate,protein,uronic acid,and sulfate in AMPP were 83.5%,0.5%,2.7%,and 2.6%,respectively.High-performance liquid chromatograp... A water-soluble polysaccharide from abalone muscle(AMPP)was isolated.The contents of carbohydrate,protein,uronic acid,and sulfate in AMPP were 83.5%,0.5%,2.7%,and 2.6%,respectively.High-performance liquid chromatography analysis indicated that AMPP was homogeneous and had an average molecular weight of approximately 3.2 kDa.The main monosaccharides of AMPP were glucose(Glc)and mannose with a molar ratio of 99.7:0.3.The structural characteristics of AMPP were elucidated through methylation analysis,Fourier transform infrared spectroscopy,and nuclear magnetic resonance spectroscopy.The linkages of AMPP consisted of terminal,1,4-linked,1,6-linked,and 1,4,6-linked Glcp with a molar ratio of 3.1:7.2:1.0:2.5.In one repeat unit of the proposed AMPP structure,the backbone chain was composed of eight 1→4 glycosidic bonds and one 1→6 glycosidic bond,with three branch chains linked by 1→6 glycosidic bond.In addition,AMPP was found to possess potent immunostimulatory activity via rising phagocytosis of RAW264.7 cells and promoting secretion of TNF-α. 展开更多
关键词 Polysaccharide Abalone muscle Structural characterization Immunostimulatory activity Nuclear magnetic resonance spectra
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Structural Characterization and Aquatic Toxicity Prediction of Esters 认领 引用 被引量：1
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作者 LI Jian-Feng LIAO Li-Min 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2021年第6期711-721,683,共11页
Based on the three-dimensional structures of the compounds,the structures of 48 ester compounds were expressed parametrically.Through multiple linear regression and partial least-squares regression,the relationship mo... Based on the three-dimensional structures of the compounds,the structures of 48 ester compounds were expressed parametrically.Through multiple linear regression and partial least-squares regression,the relationship models between ester compound structures and aquatic toxicity log(1/IGC50)were established.The correlation coefficients(R2)of the models were 0.9974 and 0.9940,and the standard deviations(SD)were 0.0469 and 0.0646,respectively.The stability of the models was evaluated by the leave-one-out internal cross-test.The correlation coefficients(RCV2)of the models of interactive tests were 0.9939 and 0.8952,and the standard deviation(SDCV)was 0.0715 and 0.0925,respectively.The external samples were used to test the predictive ability of the models,and the correlation coefficients(Rtest2)of the external predictions were 0.9955 and 0.9955,and the standard deviations(SDtest)were 0.0720 and 0.0716,respectively.The molecular structure descriptors could successfully represent the structural characteristics of the compounds,and the built models had good fitting effects,strong stability and high prediction accuracy.The present study has a good reference value for the study of the structure-toxicity relationship of toxic compounds in the environment. 展开更多
关键词 ester compounds structural characterization aquatic toxicity simulation prediction
Green Method, Optical and Structural Characterization of ZnO Nanoparticles Synthesized Using Leaves Extract of M. oleifera 认领 引用
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作者 Jose Vulfrano Gonzalez-Fernandez Diego David Pinzon-Moreno +1 位作者 Antony Alexander Neciosup-Puican Maria Veronica Carranza-Oropeza 《Journal of Renewable Materials》 EI CAS 2022年第3期833-847,共15页
ZnO nanoparticles(ZnO-NP)present innovative optical,electrical,and magnetic properties that depend on spe-cific characteristics,e.g.,size,distribution,and morphology.Thus,these properties are essential to address vari... ZnO nanoparticles(ZnO-NP)present innovative optical,electrical,and magnetic properties that depend on spe-cific characteristics,e.g.,size,distribution,and morphology.Thus,these properties are essential to address various applications in areas such as electronics,medicine,energy,and others.In addition,the performance of this ZnO-NP depends of their preparation which can be done by chemical,physical,and biological methods.Meanwhile,nowadays,the main interest in developing ZnO-NP synthesis through biological methods bases on the decrease of use of toxic chemicals or energy applied to the procedures,making the process more cost-effective and environ-mentally friendly.However,the large-scale production of nanoparticles by green synthesis remains a big challenge due to the complexity of the biological extracts used in chemical reactions.That being the case,the preparation of ZnO-NP using Moringa oleifera extract as an alternative biological agent for capping and reduction in synthesis was evaluated in this work.Then,the results based on the analysis of the optical and structural characterization of the ZnO-NP obtained by employing UV-Vis,DLS,zeta potential,XRD,ATR-FTIR,and FE-SEM indicate mostly the presence of spherical nanosized material with a mean hydrodynamic diameter of 47.2 nm measured by DLS and a mean size diameter of 25 nm observed with FE-SEM technique.Furthermore,in FE-SEM images a homo-geneous dispersion and distribution is observed in the absence of agglutination,agglomeration,or generation of significant lumps of the ZnO-NP.The XRD analysis showed that heat annealing induced the crystallite size favor-ing their monocrystallinity.Those obtained data confirm the synthesis of ZnO-NP and the absence of impurities associated with organic compounds in the annealed samples.Finally,those results and low-cost production pre-sent to the synthesized ZnO-NP by this biological method as a useful material in several applications. 展开更多
关键词 ZnO nanoparticles green chemistry Moringa oleifera extract optical characterization structural characterization
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Ultrasonic-enzymatic synergistic extraction of Ophiopogon japonicus polysaccharides:Structural characterization,in vitro hypoglycemic activity,and regulatory mechanism on human gut microbiota 认领 引用 被引量：2
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作者 Junlin Wu Meng Wang +6 位作者 Yutong Liao Sijie Huang Xincheng Ye Fengchuan Ma Siming Zhu Yunping Peng Dan Xu 《Food Bioscience》 SCIE 2026年第1期891-907,共17页
In this study,a novel ultrasound-enzyme synergistic extraction method was developed to obtain a structural variation Ophiopogon japonicus polysaccharide,OJP1-UE,with significantly improved extraction yield and bioacti... In this study,a novel ultrasound-enzyme synergistic extraction method was developed to obtain a structural variation Ophiopogon japonicus polysaccharide,OJP1-UE,with significantly improved extraction yield and bioactivity.Through systematic single-factor experiments,the optimal extraction parameters were determined as follows:solid-liquid ratio 1∶20,ultrasonic treatment(20 min,40% power),and enzymatic hydrolysis(6 h,50℃,pH 6,enzyme dosage 3%);under these conditions,the polysaccharide yield reached as high as 27.62%.The purified homogeneous OJP1-UE is composed mainly of glucose and mannose and contains four characteristic glycosyl residues:Glcp-(1→,→4)-Manp-(1→,→4)-Glcp-(1→,and→4,6)-Galp-(1→),with molar ratios of 0.143∶0.102∶0.633∶0.122,respectively.The main chain is primarily formed by(1→4)-α-D-Glcp(residue B)and(1→4,6)-α-D-Glcp(residue A),and the polysaccharide possesses a stable triple-helix conformation.In vitro biological evaluation showed that OJP1-UE exerted potent inhibitory effects against α-amylase(inhibition rate 96.52% at 10 mg/mL)and α-glucosidase(inhibition rate 75.07%).Furthermore,fermentation studies indicated that OJP1-UE could modulate gut microbiota by significantly increasing the production of SCFAs,enriching beneficial bacterial populations,and suppressing the abundance of the pathogenic phylum Proteobacteria.This study provides strong evidence that the ultrasound-enzyme synergy can enhance polysaccharide bioactivity by modulating molecular weight and conformation.These findings offer valuable theoretical insights and practical technical support for the application of OJP1-UE in functional foods and as an adjunctive therapy for diabetes. 展开更多
关键词 Ophiopogon japonicus polysaccharide Ultrasound-enzymatic extraction Structural characterization Hypoglycemic activity Gut microbiota regulation
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