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二陈汤通过Nrf2/HO-1信号通路调节氧化应激和代谢紊乱改善SiO2诱导的肺损伤 认领 引用
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作者 芦俊 朱馨怡 +6 位作者 刘子怡 胡吉霞 陈佳露 肖荣 王智槟 刘畅 卢芳国 《中国实验方剂学杂志》 CAS CSCD 北大核心 2026年第13期32-42,共11页
目的:观察二陈汤对二氧化硅(SiO2)诱导肺损伤大鼠的保护作用,探讨其作用机制。方法:采用一次性气管滴注50 g·L-1 SiO2混悬液建立肺损伤大鼠模型。将30只雄性SD大鼠随机分为正常组,模型组,二陈汤低、高剂量组(4.5、9 g·k... 目的:观察二陈汤对二氧化硅(SiO2)诱导肺损伤大鼠的保护作用,探讨其作用机制。方法:采用一次性气管滴注50 g·L-1 SiO2混悬液建立肺损伤大鼠模型。将30只雄性SD大鼠随机分为正常组,模型组,二陈汤低、高剂量组(4.5、9 g·kg-1·d-1)和地塞米松组(0.2 mg·kg-1·d-1),连续干预4周。苏木素-伊红(HE)染色观察肺组织病理变化;生化法检测肺组织丙二醛(MDA)、超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GPX)水平;实时荧光定量聚合酶链式反应(Real-time PCR)、蛋白免疫印迹法(Western blot)及免疫荧光法检测核因子E2相关因子2(Nrf2)/血红素加氧酶-1(HO-1)信号通路关键分子的表达。超高效液相色谱-串联质谱法(UPLC-MS/MS)鉴定二陈汤主要活性成分,结合分子对接技术评估其核心成分与Nrf2/HO-1的结合能力。超高效液相色谱-四极杆-飞行时间质谱法(UPLC-Q-TOF-MS)非靶向代谢组学技术分析肺组织代谢谱,相关性分析筛选与Nrf2/HO-1信号通路密切相关的差异代谢物及指标。结果:与正常组比较,模型组大鼠体质量增长率显著降低,肺指数显著升高,肺组织MDA含量显著升高,SOD和GPX活性明显降低,Nrf2 mRNA及蛋白表达明显降低,HO-1、GPX4蛋白表达明显降低,Kelch样ECH关联蛋白1(Keap1)蛋白明显升高(P<0.05,P<0.01)。与模型组比较,二陈汤明显减缓SiO2诱导的大鼠体质量下降趋势(P<0.05);减轻大鼠肺泡炎性细胞浸润和矽结节形成;降低肺组织MDA含量,提高SOD和GPX活性(P<0.05,P<0.01)。UPLC-MS/MS和分子对接结果显示橙皮苷、甘草酸等二陈汤核心成分与Nrf2/HO-1具有强结合亲和力;分子生物学实验表明二陈汤可促进Nrf2核转位,上调HO-1、GPX4 mRNA及蛋白表达,下调Keap1表达(P<0.05,P<0.01)。代谢组学结果显示,二陈汤可回调SiO2诱导的亚油酸、谷氨酰胺等代谢物异常表达(P<0.05,P<0.01)。相关性分析表明,Nrf2、HO-1与SOD、GPX呈明显正相关(P<0.05,P<0.01),与谷氨酰胺、丝氨酸呈明显负相关(P<0.05,P<0.01)。结论:二陈汤可能通过核心成分激活Nrf2/HO-1信号通路,调节氧化应激及代谢紊乱,从而改善SiO2诱导的大鼠肺损伤,为防治职业性肺损伤提供实验依据。 展开更多
关键词 二陈汤 二氧化硅(SiO2) 肺损伤 核因子E2相关因子2(Nrf2)/血红素加氧酶-1(HO-1)信号通路 氧化应激 代谢紊乱
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考虑纳米SiO2颗粒作用的Cu-SiO2-Cu接触界面摩擦性能研究 认领 引用
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作者 马金兰 张肖 +2 位作者 佟瑞庭 张皓宸 张润成 《表面技术》 EI CAS CSCD 北大核心 2026年第13期99-110,共12页
目的为揭示空间尘埃环境纳米SiO2颗粒侵入软金属接触界面后的摩擦机理,本文系统研究了颗粒尺寸、形貌等因素对接触界面摩擦行为的影响,为空间机构Cu润滑膜的设计与防护提供理论依据。方法采用分子动力学方法构建Cu-SiO2-Cu三体纳... 目的为揭示空间尘埃环境纳米SiO2颗粒侵入软金属接触界面后的摩擦机理,本文系统研究了颗粒尺寸、形貌等因素对接触界面摩擦行为的影响,为空间机构Cu润滑膜的设计与防护提供理论依据。方法采用分子动力学方法构建Cu-SiO2-Cu三体纳米接触模型,将Cu视为比较厚的软金属润滑膜,引入不同形貌的SiO2颗粒,在不同条件下开展研究。结果颗粒尺度对界面摩擦具有显著的尺寸效应,当颗粒半径为1nm时,强黏附与局部变形导致平均摩擦力最高;随着颗粒半径增大至2nm,滚动作用增强,摩擦力降低;当继续增大颗粒尺寸时,接触面积增大、滚动被抑制,摩擦力开始回升。下压深度增加会导致接触区塑性变形与犁削作用增强,使摩擦力大幅度上升。滑动速度对摩擦力的影响表现出先减小后增大的特征。相较于光滑球形颗粒,具有表面凸起的近球形颗粒在接触表面会产生更强的应力集中与犁沟效应,并伴随温度急剧上升,导致摩擦水平进一步增加。结论SiO2颗粒作为第三体时,对于颗粒适中且表面平滑的情况,体系可形成滚-滑混合运动并表现出“纳米轴承效应”;颗粒过小或形貌尖锐时,黏附与犁沟共同主导摩擦,能量耗散加剧;过大尺寸、过大下压深度以及过高滑动速度则通过几何约束、剪切集中和热效应使摩擦力升高。 展开更多
关键词 分子动力学 SiO颗粒 Cu-SiO2-Cu 三体接触 滑动接触
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TiO2-Ag双功能涂层协同修饰的SiO基复合负极材料制备及高容量锂离子存储性能研究 认领 引用
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作者 吴霞 张海燕 洪浩群 《新能源进展》 CSCD 北大核心 2026年第2期167-175,共9页
为满足锂离子电池领域对高容量、长寿命储能技术的迫切需求,硅基负极材料因其高理论容量优势成为产业化应用研究的重点。然而,硅(Si)在锂化过程中严重的体积膨胀制约了其应用。与Si相比,一氧化硅(SiO)的体积膨胀虽有所降低,但仍存在本... 为满足锂离子电池领域对高容量、长寿命储能技术的迫切需求,硅基负极材料因其高理论容量优势成为产业化应用研究的重点。然而,硅(Si)在锂化过程中严重的体积膨胀制约了其应用。与Si相比,一氧化硅(SiO)的体积膨胀虽有所降低,但仍存在本征电导率低和初始库仑效率低等问题。为解决SiO材料的缺陷,采用二氧化钛(TiO2)和银(Ag)双功能涂层修饰策略,通过球磨法和溶胶凝胶法制备了TiO2和Ag双涂层修饰的SiO基复合材料(D-SiO@TiO2@Ag)。电化学测试表明,在0.2 A/g电流密度下,该复合材料经过100次循环后可逆容量为1164.3 mA·h/g,容量保持率为73.29%,显著高于未修饰SiO的547.9 mA·h/g和34.16%。D-SiO@TiO2@Ag复合材料结合了SiO的高容量和TiO2的缓解体积膨胀优势,同时通过Ag纳米颗粒提升了导电性和电荷传输性能,为新一代高容量、高稳定性的硅基负极材料提供了设计思路。 展开更多
关键词 纳米复合材料 锂离子电池 硅基负极 银纳米颗粒 SiO TiO2
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丝胶蛋白/SiO2纳米复合溶胶对芳纶服用性能的影响 认领 引用
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作者 田恬 尉霞 +3 位作者 康青青 罗璟娴 王庆博 刘阳 《纺织科技进展》 CAS 2026年第1期27-30,共4页
为解决芳纶织物服用性能不足的问题,制备丝胶蛋白/SiO2纳米复合溶胶并将其整理到间位芳纶上,研制出不同复合溶胶的织物试样,并探究复合溶胶浓度对芳纶织物服用性能的影响。结果表明,当复合溶胶浓度为4%时,整理后织物的各项性能较好。在... 为解决芳纶织物服用性能不足的问题,制备丝胶蛋白/SiO2纳米复合溶胶并将其整理到间位芳纶上,研制出不同复合溶胶的织物试样,并探究复合溶胶浓度对芳纶织物服用性能的影响。结果表明,当复合溶胶浓度为4%时,整理后织物的各项性能较好。在最优整理条件(浓度4%)下,间位芳纶的回潮率、导湿性、抗静电性及透湿性均有所改善,而透气性略微下降,总体而言,芳纶织物的服用性能得到改善。 展开更多
关键词 丝胶蛋白/SiO2纳米复合溶胶 间位芳纶 服用性能
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SiO 2气凝胶复合材料的低温常压制备与节能性能研究 认领 引用
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作者 王婷 赵宝宝 白硕 《功能材料》 CAS CSCD 北大核心 2026年第7期170-178,共9页
以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为共前驱体,采用酸碱两步溶胶-凝胶法结合常压干燥工艺,制备了疏水改性SiO 2气凝胶复合材料,系统研究了TEOS与MTES摩尔比(8∶2、6∶4、4∶6、2∶8)对气凝胶化学结构、微观形貌、孔结构、疏... 以正硅酸乙酯(TEOS)和甲基三乙氧基硅烷(MTES)为共前驱体,采用酸碱两步溶胶-凝胶法结合常压干燥工艺,制备了疏水改性SiO 2气凝胶复合材料,系统研究了TEOS与MTES摩尔比(8∶2、6∶4、4∶6、2∶8)对气凝胶化学结构、微观形貌、孔结构、疏水性能、热稳定性、力学性能及导热性能的影响。结果表明,MTES成功以Si—CH3形式接枝于气凝胶骨架,实现由亲水向疏水的转变。当n(TEOS)∶n(MTES)=4∶6时,SiO 2气凝胶复合材料的综合性能最优,其接触角达141.8°、比表面积为678 m2/g、孔容为1.82 cm 3/g、平均孔径为10.7 nm、抗压强度达1.12 MPa、最大变形量为16.5%、密度为0.020 g/cm 3、导热系数低至0.15 W/(m·K),较未改性样品降低50%。同时,其5%和10%热失重温度分别提高至246和338℃,800℃残炭率达86.2%。适量MTES改性可有效抑制常压干燥过程中的收缩与开裂,构建均匀完整的三维介孔网络,显著提升气凝胶的结构稳定性、力学性能和隔热性能,所制备的SiO 2气凝胶复合材料在超低能耗建筑保温领域展现出良好的应用前景。 展开更多
关键词 SiO 2 气凝胶 疏水改性 热稳定性 力学性能
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Fracture Mechanism of 3D, Five-directional Braided (SiO_2)_f /SiO_2 Composites Prepared by Silicasol-infiltration-sintering Method 认领 引用 被引量：1
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作者 李斌斌 ZHU Jianxun +2 位作者 LIN Long LIU Yong CHEN Zhaofeng 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2013年第2期355-357,共3页
Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural stren... Three-dimensional （3D） five-directional braided （SiO2）/SiO2 composites were prepared by silicasol-infiltration-sintering （SIS） method. The flexural properties and microstructures were studied. The flexural strength and flexural elastic modulus were found to be 73 MPa and 12 GPa, respectively. The results of stress vs deflection curve and SEM examinations revealed that the fracture mechanism of 3D, five-directional braided （SiO2）/SiO2 composite was a mixture mode of ductile and brittle. The ductile mode was attributed to the weak bonding strength of fiber/matrix at low temperature. The brittle fracture might be caused by the propagation of micro defect or crack, which existed in the as-prepared composites for the ten-cycle process. 展开更多
关键词 fracture mechanism 3D five-directional （SiO2）y/SiO2 composite silicasol-infiltrationsintering method
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Fe2O3-SiO2复合气凝胶材料的制备及耐温性能 认领 引用 被引量：1
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作者 侯建业 张忠伦 +2 位作者 付晓晴 王明铭 刘振森 《耐火材料》 CAS 北大核心 2025年第2期133-137,共5页
为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添... 为了提高SiO2气凝胶在高温下的隔热性能,以溶胶-凝胶两步法制备SiO2前驱体溶液,将遮光剂Fe2O3粉末添加到SiO2前驱体溶液中,结合二氧化碳超临界干燥技术,制备出Fe2O3-SiO2复合气凝胶,探究Fe2O3遮光剂的添加(Fe2O3外加质量分数分别为0、0.2%、0.5%、1.0%和3.0%)对气凝胶的影响。结果表明:1)Fe2O3添加到气凝胶中,不会影响气凝胶的形貌;Fe2O3的添加抑制了材料因高温造成的质量损失,提高了复合材料在高温下的稳定性。2)温度低于800℃时,Fe2O3外加量为0.5%(w)的试样,其热导率最低,隔热性能最好;而在800~1000℃温度下,Fe2O3外加量为1%(w)的试样,其热导率最低,仍保持较好的纳米多孔结构。3)通过控制Fe2O3外加量,可以得到适用于不同温度段的复合气凝胶。 展开更多
关键词 Fe2O3-SiO2复合气凝胶 遮光剂 孔结构 热导率 高温性能
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SiO2气凝胶水性保温隔热高温涂料性能研究 认领 引用
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作者 彭战军 韩荣荣 王天赋 《广东化工》 CAS 2025年第15期38-40,31,共3页
本文以SiO2气凝胶作为绝热填料,设计了一种水性保温隔热高温涂料,讨论了配方组成对涂料的稳定性影响,细致研究了SiO2气凝胶添加量和温度对涂料粘结强度、导热系数和耐温性能的影响规律。TG-DSC分析表明SiO2气凝胶水性隔热保温... 本文以SiO2气凝胶作为绝热填料,设计了一种水性保温隔热高温涂料,讨论了配方组成对涂料的稳定性影响,细致研究了SiO2气凝胶添加量和温度对涂料粘结强度、导热系数和耐温性能的影响规律。TG-DSC分析表明SiO2气凝胶水性隔热保温高温涂料,在20℃~500℃升温过程中只有20%的失重,表明涂料具有良好的稳定性,SEM照片和EDS分析表明涂料体系均匀;随着SiO2气凝胶含量的增加,涂料的导热系数降低,但涂料的粘结强度也随之下降;当SiO2气凝胶含量为45%时,涂料的综合性能最佳,常温粘接强度为0.20 Mpa,导热系数为0.036 W·m-1·K-1,500℃时,粘接强度0.1 MPa,导热系数为0.074 W·m-1·K-1。 展开更多
关键词 SiO2气凝胶 隔热保温涂料 高温性能 粘结强度 导热系数
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纳米SiO2/钢纤维改性煤矸石地聚物混凝土性能研究 认领 引用 被引量：5
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作者 周彦森 徐钟 +3 位作者 刘兵兵 孙晓静 杨瑞禧 余昊龙 《人民长江》 北大核心 2025年第2期201-208,共8页
为了提高煤矸石地聚物混凝土的力学性能,探索其工程应用潜力,以煤矸石、矿渣为原料制备地聚物混凝土,研究纳米SiO 2(0~2.5%)和钢纤维(0~1.25%)单独及复合掺入对地聚物混凝土力学性能的影响,并用扫描电子显微镜观察了地聚物混凝土的微观... 为了提高煤矸石地聚物混凝土的力学性能,探索其工程应用潜力,以煤矸石、矿渣为原料制备地聚物混凝土,研究纳米SiO 2(0~2.5%)和钢纤维(0~1.25%)单独及复合掺入对地聚物混凝土力学性能的影响,并用扫描电子显微镜观察了地聚物混凝土的微观形貌,分析改性机理。结果表明:适量的钢纤维或纳米SiO 2掺入均能显著提高地聚物混凝土的力学性能,两者混合使用改性效果则更好。在抗压强度方面,纳米SiO 2改性煤矸石混凝土优于钢纤维;在劈裂抗拉和抗折强度方面,钢纤维改性效果更好。纳米SiO 2和钢纤维的复合使用改性效果更好,是由于纳米SiO 2不仅提高了地聚物凝胶的微密度,而且增强了钢纤维与基体之间的结合。研究结果丰富了纳米SiO 2和钢纤维改性地聚物复合材料性能的知识体系,有助于煤矸石地聚物混凝土的进一步推广应用。 展开更多
关键词 地聚物混凝土 钢纤维 纳米SiO 2 微观形貌 改性机理
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SiO2嵌入分离层制备高性能薄膜复合膜 认领 引用 被引量：1
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作者 胡小杰 丰桂珍 +2 位作者 方圳生 张火梅 陈俊 《水处理技术》 CAS CSCD 北大核心 2025年第3期44-48,共5页
为提高传统纳滤膜的分离性与抗污染性,以聚砜超滤膜(PSF)为基膜,以哌嗪(PIP)、均苯三甲酰氯(TMC)分别为水、有机相单体,引入二氧化硅(SiO2)作为水相添加材料,通过界面聚合(IP)反应制备二氧化硅薄膜复合膜(TFN-SiO2),研究SiO2... 为提高传统纳滤膜的分离性与抗污染性,以聚砜超滤膜(PSF)为基膜,以哌嗪(PIP)、均苯三甲酰氯(TMC)分别为水、有机相单体,引入二氧化硅(SiO2)作为水相添加材料,通过界面聚合(IP)反应制备二氧化硅薄膜复合膜(TFN-SiO2),研究SiO2的添加对膜表面特性、分离性能及抗污染性能的影响。结果表明:SiO2的嵌入对膜的表面粗糙度、亲水性和负电性都有较大增强;当SiO2添加质量比为0.02%时,TFN-SiO2膜的水通量达到35.5 L/(m2·h),对Na2SO4的截留维持在95%以上,在30 h的脱盐试验中保持良好的稳定性,同时对腐殖酸(HA)、牛血清蛋白(BSA)、海藻酸钠(SA)三种模型污染物的抗污染性能有所提升。 展开更多
关键词 界面聚合 SiO2 薄膜复合膜 抗污染性
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纳米SiO2对樱桃萝卜光合特性及叶绿素荧光参数的影响 认领 引用 被引量：2
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作者 廖浩林 罗学刚 牟茂 《安徽农业科学》 CAS 2025年第4期32-35,92,共4页
以樱桃萝卜为试验材料,采用水培试验设计,通过根部灌施纳米SiO2悬浊液的方法,研究不同浓度纳米SiO2(0、50、100、200、400 mg/L)对樱桃萝卜叶片光合色素含量、光合特征参数和叶绿素荧光参数的影响。结果表明,根部灌施纳米SiO2... 以樱桃萝卜为试验材料,采用水培试验设计,通过根部灌施纳米SiO2悬浊液的方法,研究不同浓度纳米SiO2(0、50、100、200、400 mg/L)对樱桃萝卜叶片光合色素含量、光合特征参数和叶绿素荧光参数的影响。结果表明,根部灌施纳米SiO2对樱桃萝卜的净光合速率(P_n)影响不显著,但对其气孔导度(Gs)、蒸腾速率(Tr)、胞间CO2浓度(Ci)有显著影响,尤其是在中高浓度时。光合色素即叶绿素和类胡萝卜素含量显著增加,但高浓度时有所下降。同时,添加纳米SiO2对樱桃萝卜的叶绿素荧光参数PS II的最大光化学量子产量(Fv/Fm)无明显影响,Y(II)(PS II的有效光量子产量)、ETR(相对光合电子传递速率)、qP(光化学荧光猝灭系数),qL(PS II天线色素光化学荧光猝灭系数)显著上升,在200 mg/L时最显著。qN(暗适应下光化学荧光猝灭系数)、NPQ(光照下非光化学荧光猝灭)无明显变化。研究结果表明,与对照组相比,添加纳米二氧化硅不会对樱桃萝卜光合系统产生胁迫。 展开更多
关键词 纳米SiO2 樱桃萝卜 水培 光合特征 叶绿素荧光参数
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Novel SiO2 nanoparticle-decorated BiOCl nanosheets exhibiting high photocatalytic performances for the removal of organic pollutants 认领 引用 被引量：21
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作者 Changlin Yu Hongbo He +2 位作者 Xingqiang Liu Julan Zeng Zhen Liu 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第8期1212-1221,共10页
Novel SiO2/BiOCl composites were fabricated by decorating BiOCl nanosheets with SiO2 nanoparticles via a simple hydrothermal process. The as-prepared pure BiOCl and SiO2/BiOCl composites were intensively characterized... Novel SiO2/BiOCl composites were fabricated by decorating BiOCl nanosheets with SiO2 nanoparticles via a simple hydrothermal process. The as-prepared pure BiOCl and SiO2/BiOCl composites were intensively characterized by various techniques such as XRD, FT-IR, SEM/TEM, BET, UV-vis, DRS, XPS, and photocurrent measurements. The SiO2/BiOCl composite nanosheets displayed high photocatalytic activity and excellent stability in the degradation of organic pollutants such as phenol, bisphenol A (BPA), and rhodamine B (RhB). With respect to those over bare BiOCl, the degradation rates of RhB, BPA, and phenol over 1.88% SiO2/BiOCl increased 16.5%, 29.0%, and 38.7%, respectively. Radical capturing results suggested that h^+ is the major reactive species and that hydroxyl (·OH) and superoxide (·O2^-) radicals could also be involved in the degradation of organic pollutants. The enhanced photocatalytic performances of SiO2/BiOCl composites can be mainly attributed to the improved texture and the formation of intimate SiO2/BiOCl interfaces, which largely promoted the adsorption of organic pollutants, enhanced the light harvesting, and accelerated the separation of e^– and h^+. 展开更多
关键词 SiO2/BiOCl Nanosheets Organic pollutant Photocatalysis Interface
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Joining of SiO2 ceramic and TC4 alloy by nanoparticles modified brazing filler metal 认领 引用 被引量：17
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作者 Hong BIAN Yanyu SONG +3 位作者 Duo LIU Yuzhen LEI Xiaoguo SONG Jian CAO 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2020年第1期383-390,共8页
Nano-Al2O3 particles modified Ag Cu Ni filler was adopted to braze the SiO2 ceramic and TC4.The effects of filler size as well as the brazing temperature on the interfacial microstructure and mechanical property of th... Nano-Al2O3 particles modified Ag Cu Ni filler was adopted to braze the SiO2 ceramic and TC4.The effects of filler size as well as the brazing temperature on the interfacial microstructure and mechanical property of the joints were investigated.Nanoscale filler reduced the phases dimension and promoted the homogeneous distribution of microstructure,obtaining a higher joint strength when compared to microscale filler.The increase of brazing temperature made the accelerating dissolution and diffusion of Ti,which promoted the increase of thickness of Ti4O7+TiSi2 layer adjacent to SiO2 ceramic and diffusion layer zone nearby TC4 alloy.The hypoeutectic structure was produced in the brazing seam due to the high Ti content.The maximum shear strength of^40 MPa was obtained at 950°C for 10 min. 展开更多
关键词 Brazing Microstructure Nanoparticles modified filler SiO2 ceramic TC4
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Preparation of SiO_2 coated Ce_2S_3 red pigment with improved thermal stability 认领 引用 被引量：23
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作者 陈观宏 朱振峰 +2 位作者 刘辉 武英峰 朱春奎 《Journal of Rare Earths》 SCIE EI CAS CSCD 2013年第9期891-896,共6页
SiO2 coated Ce2S3 red pigment was prepared in ethanol/H2O system via sol-gel method and TEOS were used as silica sources. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive spectroscopy... SiO2 coated Ce2S3 red pigment was prepared in ethanol/H2O system via sol-gel method and TEOS were used as silica sources. X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDX）, UV-visible spectro-photometer and automatic colorimeter were used to investigate the properties of the samples. The results showed that the compact SiO2 film formed on the surface of Ce2S3 pigment at a cerium silicon molar ratio of 2. The thermal stability temperature of Ce2S3 pigment was improved to 450 oC after SiO2 coating. In addition, the color of Ce2S3 pigment was not affected significantly through coating colorless and transparent SiO2 and it could be used as safe red pigment in higher temperature fields. 展开更多
关键词 Ce2S3 red pigment SiO2 coating cerium silicon molar ratio thermal stability rare earths
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Effect of boron doping on waterproof and dielectric properties of polyborosiloxane coating on SiO2f/SiO2 composites 认领 引用 被引量：8
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作者 Long XIA Siru LU +7 位作者 Bo ZHONG Longnan HUANG Hua YANG Tao ZHANG Haibo HAN Pan WANG Li XIONG Guangwu WEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2019年第8期2017-2027,共11页
A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among b... A hydrophobic coating of the silica fiber reinforced silica composites(SiO2f/SiO2) was synthesized by sol-gel method using methyltriethoxy-silane(MTES) and boric acid(B(OH)3) as raw materials. The relationship among boron doping, chemical structure of precursors and durability of hydrophobic coatings was discussed. The Si-O-B and methyl groups were successfully introduced in the gel precursors according to the FT-IR and XPS results. The resins were filled in the internal and surface holes of the SiO2f/SiO2 composites partially or completely, which is beneficial to reduce the physical adsorption of the moisture. In addition, hydroxyl groups of the SiO2f/SiO2 composites reacted with the resins and hydrophobic methyl groups were introduced, leading to the reduction of the chemical adsorption of water. Also, the boron doping was beneficial to enhancing the physical cross-linking between the coating and the SiO2f/SiO2 composites, and improved the adhesion of the coating to the substrate. The results show that the optimal hydrophobic coating with contact angle 130.33°, moisture absorption 0.33% and adhesion level 1 is obtained when the molar ratio of MTES to B(OH)3 is 10:4. The real permittivity of M10B4 is constant in the range of 2.32–2.51 and the dielectric tangent loss is constant in the range of 5.5 × 10-4–8.7 × 10-3. The hydrophobic coating has excellent dielectric properties. 展开更多
关键词 Adhesion Dielectric Hydrophobic Polyborosiloxane SiO2f/SiO2 composites
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Reaction behaviour of Al_2O_3 and SiO_2 in high alumina coal fly ash during alkali hydrothermal process 认领 引用 被引量：28
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作者 蒋周青 杨静 +2 位作者 马鸿文 王乐 马玺 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第6期2065-2072,共8页
The reaction behaviours of A1203 and SiO2 in high alumina coal fly ash under various alkali hydrothermal conditions were studied. The means of XRD, XRF, FTIR and SEM were used to measure the mineral phase and morpholo... The reaction behaviours of A1203 and SiO2 in high alumina coal fly ash under various alkali hydrothermal conditions were studied. The means of XRD, XRF, FTIR and SEM were used to measure the mineral phase and morphology of the solid samples obtained by different alkali hydrothermal treatments as well as the leaching ratio of SiO2 to A1203 in alkali solution. The results showed that with the increase of the hydrothermal treating temperature from 75 to 160 ~C, phillipsite-Na, zeolite A, zeolite P, and hydroxysodalite were produced sequentially while the mullite and corundum phase still remained. Zeolite P was massively formed at low-alkali concentration and the hydroxysodalite was predominantly obtained at high-alkali concentration. By the dissolution of aluminosilicate glass and the formation of zeolites together, the leaching efficiency of SiO2 can reach 42.13% with the mass ratio of A1203/SIO2 up to 2.19：1. 展开更多
关键词 high alumina coal fly ash A1203 SiO2 alkali hydrothermal treatment reaction behaviour
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Simulated-sunlight-activated photocatalysis of Methylene Blue using cerium-doped SiO_2/TiO_2 nanostructured fibers 认领 引用 被引量：11
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作者 Yu Liu Hongbing Yu +5 位作者 Zhenning Lv Sihui Zhan Jiangyao Yang Xinhong Peng Yixuan Ren Xiaoyan Wu 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第10期1867-1875,共9页
Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, X-ray dif... Cerium-doped SiO2/TiO2 nanostructured fibers were fabricated by electrospinning technology. The prepared fibers were characterized by thermogravimetric analysis （TGA）, scanning electron microscopy （SEM）, X-ray diffraction （XRD） and Fourier transform infrared spectroscopy （FT-IR）. Using the fibers as catalysts, photoeatalytic degradation of Methylene Blue （MB） aqueous solution was carded out under simulated sunlight. The 0.2% Ce doping proved to be the optimal concentration for the doping of TiO2/SiO2, compared to other Ce-doped molar concentrations. The 0.2% Ce-doped SiOdTiO2 fibers exhibited higher photocatalytic activity than industrial Degussa P25 and the samples doped with only Ce or SIO2. The reasons for improving the photocatalytic activity were also discussed. Several operational parameters were studied, which showed that the photocatalytic efficiency of MB was influenced by parameters such as the initial dye concentration, the initial pH, inorganic anions, and so on. In addition, the influences of an electron acceptor and a radical scavenger suggested that OH was the dominant photooxidant during the photocatalytic process. The reuse evaluation of the fibers indicated that their photocatalytic activity had good stability. 展开更多
关键词 photocatalysis SiO2/TiO2 cerium nanostructured fibers Methylene Blue
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Kinetics of SiO_2 leaching from Al_2O_3 extracted slag of fly ash with sodium hydroxide solution 认领 引用 被引量：17
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作者 王若超 翟玉春 +1 位作者 宁志强 马培华 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第6期1928-1936,共9页
Kinetics of SiO2 leaching from Al2O3 extracted slag of fly ash with sodium hydroxide solution was studied.The effect of leaching temperature,mass ratio of NaOH to SiO2 and stirring speed on SiO2 leaching rate was inve... Kinetics of SiO2 leaching from Al2O3 extracted slag of fly ash with sodium hydroxide solution was studied.The effect of leaching temperature,mass ratio of NaOH to SiO2 and stirring speed on SiO2 leaching rate was investigated.The results show that increasing leaching temperature,mass ratio of NaOH to SiO2 and stirring speed increases SiO2 leaching rate.The SiO2 leaching rate is 95.66%under the optimized conditions.There are two stages for the SiO2 leaching process,and the leaching reaction is very rapid in the first stage but quite slow in the second stage.The whole leaching process follows the shrinking core model,and the outer diffusion of no product layer is the rate-controlling step.The activation energies of the first and second stages are calculated to be8.492 kJ/mol and 8.668 kJ/mol,respectively.The kinetic equations of the first and the second stages were obtained,respectively. 展开更多
关键词 fly ash leaching kinetics SiO2
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Preparation of TiO_2/SiO_2 Aerogels by Non-supercritical Drying Method and Their Photocatalytic Activity for Degradation of Pyridine 认领 引用 被引量：11
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作者 甘礼华 王玉栋 +2 位作者 郝志显 徐子颉 陈龙武 《Chinese Journal of Chemical Engineering》 SCIE EI CAS 2005年第6期758-763,共6页
TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XR... TiO2/SiO2 aerogels with different molar ratio of SiO2/TiO2 were prepared via non-supercritical method using tetrabutyl titanate and silica sols as raw materials. The samples were characterized by TEM, SEM, BET, IR, XRD and so on. The results indicate that the BET surface area of TiO2/SiO2 aerogels calcined at 550℃ which consisted of anatase structure of TiO2 with narrow distribution pores of 5-25 nm is as high as 357.89 m2·g-1. For the photocatalytic degradation of pyridine, the catalytic activities of TiO2/SiO2 aerogels are much higher than that of TiO2 powder. The photocatalytic activity of TiO2/SiO2 aerogels calcined at 800℃ is the optimum. The higher the content of SiO2, the higher the photocatalytic activity of TiO2/SiO2 aerogels. The cost for preparation of the aerogels is greatly reduced by using non-supercritical drying method, and the aerogels are hopefully applied in the treatment of industrial waste water such as coking effluent treatment. 展开更多
关键词 TiO2/SiO2 aerogels photocatalysis pyridine degradation
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Photocatalytic activity of TiO_2 supported SiO_2-Al_2O_3 aerogels prepared from industrial fly ash 认领 引用 被引量：9
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作者 王慧龙 齐慧萍 +2 位作者 魏晓娜 刘潇彧 姜文凤 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2016年第11期2025-2033,共9页
A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The struct... A ternary composite of TiO2 and a SiO2-Al2O3 aerogel with good photocatalytic activity was prepared by a simple sol-gel method with TiO2 nanoparticles and SiO2-Al2O3 aerogels derived from industrial fly ash.The structural features of the TiO2/SiO2-Al2O3 aerogel composite were investigated by X-ray powder diffraction,Fourier transform infrared spectroscopy,transmission electron microscopy,gas adsorption measurements and diffuse reflectance UV-visible spectroscopy.The optimal conditions for photocatalytic degradation of 2-sec-butyl-4,6-dinitrophenol（DNBP],included an initial DNBP concentration of 0.167 mmol/L at pH = 4.86 with a catalyst concentration of 6 g/L,under visible light irradiation for 5 h.A plausible mechanism is proposed for the photocatalytic degradation of DNBP.Our composite showed higher photocatalytic activity for DNBP degradation than that of pure TiO2.This indicates that this material can serve as an efficient photocatalyst for degradation of hazardous organic pollutants in wastewater. 展开更多
关键词 Titania SiO2-Al2O3 aerogel Composite photocatalyst Industrial fly ash 2-sec-butyl-4 6-dinitrophenol Wastewater treatment
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