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采用HfO_2/SiO_2溶胶-凝胶薄膜制备衍射光栅 认领 引用 被引量：4
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作者 谢永军 赵福华 +2 位作者 魏伟 赵小侠 赵卫 《光子学报》 EI CAS 北大核心 2008年第1期133-135,共3页
采用溶胶-凝胶方法制备了具有光敏性的HfO2/SiO2溶胶-凝胶薄膜,并利用其光敏性制备了衍射光栅.采用XPS分析了薄膜的成份,证实了Hf元素的存在.并用椭偏仪测试了薄膜的折射率,结果证实了HfO2的加入确实提高了体系的折射率.利用其光敏性,采... 采用溶胶-凝胶方法制备了具有光敏性的HfO2/SiO2溶胶-凝胶薄膜,并利用其光敏性制备了衍射光栅.采用XPS分析了薄膜的成份,证实了Hf元素的存在.并用椭偏仪测试了薄膜的折射率,结果证实了HfO2的加入确实提高了体系的折射率.利用其光敏性,采用X射线作曝光光源通过掩模进行曝光,利用曝光部分与未曝光部分的溶解度差,在薄膜上制备了高为0.8μm、周期为1μm的衍射光栅. 展开更多
关键词 信息光学 HfO2/SiO2溶胶-凝胶 光栅 光敏
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HfO_2/SiO_2高反射膜的缺陷及其激光损伤 认领 引用 被引量：21
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作者 胡建平 陈梅 +1 位作者 付雄鹰 柴林 《强激光与粒子束》 EI CAS 北大核心 2001年第5期529-532,共4页
用原子力、Normaski和扫描电子显微镜等分析仪器 ,对高损伤阈值薄膜常采用的 Hf O2 /Si O2 薄膜进行了表面显微图象研究 ,分析了薄膜常见的表面缺陷 ,如节瘤 ,孔洞和划痕等。薄膜表面缺陷的激光损伤实验表明 ,不同缺陷的抗激光损伤能力... 用原子力、Normaski和扫描电子显微镜等分析仪器 ,对高损伤阈值薄膜常采用的 Hf O2 /Si O2 薄膜进行了表面显微图象研究 ,分析了薄膜常见的表面缺陷 ,如节瘤 ,孔洞和划痕等。薄膜表面缺陷的激光损伤实验表明 ,不同缺陷的抗激光损伤能力大不相同 ,节瘤缺陷最低 ,约为 1 5 J/ cm2 ,薄膜的损伤阈值主要由其决定 ,孔洞的激光损伤能力与节瘤相比较高 ,约为节瘤的 2～ 3倍。节瘤缺陷在低能量密度的激光损伤所形成的孔洞 ,与镀制过程中形成的孔洞形貌相似 ,激光再损伤能力也相似。 展开更多
关键词 HfO2/SiO2高反射薄膜 表面缺陷 激光损伤 原子电子显微镜 SEM 显微分析
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Sol-gel processed Ce3+, Tb3+ codoped white emitting phosphors in Sr_2Al_2SiO_7 认领 引用 被引量：6
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作者 潘文 宁桂玲 +1 位作者 林源 杨雪峰 《Journal of Rare Earths》 SCIE EI CAS 2008年第2期207-210,共4页
Sr2Al2SiO7：Ce^3＋, Tb^3＋ white emitting phosphors were fabricated using the sol-gel method. X-Ray Powder Diffraction （XRD） analysis confirmed the formation of Sr2Al2SiO7：Ce^3＋, Tb^3＋. Scanning Electron Microsco... Sr2Al2SiO7：Ce^3＋, Tb^3＋ white emitting phosphors were fabricated using the sol-gel method. X-Ray Powder Diffraction （XRD） analysis confirmed the formation of Sr2Al2SiO7：Ce^3＋, Tb^3＋. Scanning Electron Microscopy （SEM） observation indicated that the microstructure of the phosphor consisted of regular fine grains with an average size of about 0.5-1 μm. Luminescence properties were analyzed by measuring the photoluminescence spectra. The Ce^3＋, Tb^3＋-codoped Sr2Al2SiO7 phosphors showed four main emission peaks： one at 414 nm for Ce^3＋ and three at 482, 543, and 588 nm for Tb^3＋. The emission spectra of the samples with different doping concentrations showed that the Tb^3＋ emission was dominant because of the persistent energy transfer from Ce^3＋. The decay characteristic was better than that prepared by the solid-state process in the comparable condition. The codoped phosphor displayed long persistent white phosphorescence. 展开更多
关键词 sol-gel method luminescence phosphors Sr2Al2SiO7：Ce^3＋, Tb^3＋ rare earths
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BaFe12O19/SiO_2微晶玻璃陶瓷的柠檬酸盐Sol-Gel合成及其微波性能的研究 认领 引用 被引量：5
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作者 张海军 姚熹 张良莹 《无机材料学报》 SCIE EI CAS 北大核心 2001年第6期1069-1076,共8页
采用柠檬酸 Sol－gel工艺合成了 BaFe12O19／SiO2微晶玻璃陶瓷，并对其介电常数及其磁导率在100MHz～6GHz下的变化规律进行了研究.结果表明，BaFe12O19／SiO2微晶玻璃陶瓷的合成与体系中 Fe／Ba、烧结温度密切相关；其介电常数、磁导率... 采用柠檬酸 Sol－gel工艺合成了 BaFe12O19／SiO2微晶玻璃陶瓷，并对其介电常数及其磁导率在100MHz～6GHz下的变化规律进行了研究.结果表明，BaFe12O19／SiO2微晶玻璃陶瓷的合成与体系中 Fe／Ba、烧结温度密切相关；其介电常数、磁导率基本都随测试频率的增加而下降；介电损耗值最大达到0．40，磁损耗值较小． 展开更多
关键词 BaFe12O19/SiO2 微晶玻璃陶瓷 sol-gel 微波性能 柠檬酸盐 二氧化硅 钡铁氧化物
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Ti3+在Sol-gel多孔磷光SiO_2干凝胶中的发光 认领 引用 被引量：1
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作者 王建荣 杨中喜 王英姿 《硅酸盐通报》 CAS 2002年第4期28-30,共3页
采用常规的Sol gel工艺合成了Ti3+ 掺杂的多孔磷光SiO2 干凝胶 ,Ti3+ 离子作为间隙离子存在于SiO2 网络中 ,展示了一种新颖的发光现象 ,改变了Sol gelSiO2 干凝胶的发射光谱。这种掺杂SiO2 干凝胶的激发和发射光谱均由 2个带组成 ,短波... 采用常规的Sol gel工艺合成了Ti3+ 掺杂的多孔磷光SiO2 干凝胶 ,Ti3+ 离子作为间隙离子存在于SiO2 网络中 ,展示了一种新颖的发光现象 ,改变了Sol gelSiO2 干凝胶的发射光谱。这种掺杂SiO2 干凝胶的激发和发射光谱均由 2个带组成 ,短波长的发光峰在 44 0nm(λex=3 80nm) ,其相对荧光强度约是纯SiO2 干凝胶的 5倍 ;长波长的发光峰在 60 0nm(λex=5 5 0nm) ,其相对荧光强度约是Ti3+ 掺杂ZnS纳米晶的 2 0倍。由此可以得出 :过渡金属离子掺杂的多孔磷光SiO2 展开更多
关键词 sol-gel SiO2干凝胶 Ti^3+掺杂 光致发光 多孔磷光玻璃 钛离子
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Antireflective and Self-cleaning Properties of SiO2/TiO2 Double-Layer Films Prepared by Cost-Effective Sol-Gel Process 认领 引用
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作者 Hui Zhang Duo-wang Fan +1 位作者 Tian-zhi Yu Cheng-long Wang 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2015年第6期
关键词 SiO2/TiO2 double-layer films Antireflective Self-cleaning Sol-gel process
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Sol-Gel Preparation of TiO2/SiO2 Nanocomposites and Their Application in Self- cleaning Textiles 认领 引用
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作者 LI Wan-di LIU Jun +3 位作者 TANG Hong-yu XUE Hai-jun GAO Jing WANG Lu 《Journal of Donghua University(English Edition)》 EI CAS 2014年第5期589-594,共6页
The present study involves the preparation of TiO 2/ SiO 2nanocrystals and their application in self-cleaning wool-polyester fabrics.The TiO 2/ SiO 2nanocrystals were successfully synthesized and deposited onto wool-p... The present study involves the preparation of TiO 2/ SiO 2nanocrystals and their application in self-cleaning wool-polyester fabrics.The TiO 2/ SiO 2nanocrystals were successfully synthesized and deposited onto wool-polyester fabrics using the low-temperature sol-gel technique.The as-prepared nanocomposites and the nanocomposites coated samples were characterized by X-ray diffraction( XRD) and scanning electron microscopy( SEM),respectively.The XRD and SEM results showed that the single-phase anatase nanocrystallites were formed and loaded on the fabric surface successfully.The photocatalytic activities of TiO 2-coated and TiO 2/ SiO 2-coated wool-polyester fabrics were measured by studying photodegradation of methylene blue dye.Comparison of the photocatalytic activity of the coated samples reveals superiority of TiO 2/ SiO 2modified sample with respect to that of pure TiO 2modified sample.Our observations indicate that by applying this technique to the fabrics,self-cleaning materials can be designed for practical application. 展开更多
关键词 wool-polyester fabrics TiO2/SiO2 sol-gel photocatalytic self-cleaning
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Preparation and Magnetic Properties of (Fe_7Co_3)0.15(SiO_2)0.85Granular Solids Using the Sol-Gel Method 认领 引用
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作者 Wei CHEN Denglu HOU +4 位作者 Ying LIU Guide TANG Minggang ZHU Jianguo ZHAO Xiangfu NIE and Hongyan WUTo whom correspondence should be addressed E-mail: dlhou@hebtu.edu.cn 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第4期389-389,共1页
(Fe7Co3)0.15(SiO2)0.85 granular alloy solid was prepared successfully using sol-gel method. The samples with different reducing temperatures were investigated by X-ray diffractometer(XRD),transmission electron microgr... (Fe7Co3)0.15(SiO2)0.85 granular alloy solid was prepared successfully using sol-gel method. The samples with different reducing temperatures were investigated by X-ray diffractometer(XRD),transmission electron micrography(TEM) and vibrating sample magnetometer(VSM). The av-erage particIe sizes of the samples were also calculated from Scherrer formula. The magnetic properties of (Fe7Co3 )o. 15 (SiO2)0.85 were studied in detail. 展开更多
关键词 SiO2 Fe7Co3 Preparation and Magnetic Properties of Granular Solids Using the Sol-Gel Method
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Enhanced Emission of Eu3+ in Boron Ions-Doped Sol-Gel SiO_2 Phosphors 认领 引用
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作者 Hu Xiaoyun Fan Jun +2 位作者 Bai Jintao Ren Zhaoyu Hou Xun 《Journal of Rare Earths》 SCIE EI CAS 2005年第6期705-705,共1页
Al-doped and B, Al-codoped silica xerogel was fabricated by sol-gel process. The influence of B ions and annealing temperature on luminescent properties of phosphors were studied by using fluorescence spectrum, X-ray ... Al-doped and B, Al-codoped silica xerogel was fabricated by sol-gel process. The influence of B ions and annealing temperature on luminescent properties of phosphors were studied by using fluorescence spectrum, X-ray diffraction, DSC, TG/DTG analysis and IR spectrum. The heat treatment has a large effect on the luminescent properties. Under 248 nm excitation, the emission spectrum of samples heated shows characteristic emission peaks of Eu^3＋ ions are, which are due to the transitions of ^5D0→^7FJ（J = 0, 1, 2, 3, 4） of Eu^3＋ , respectively. The transition of ^5D0→^7F1 is split into two peaks. 展开更多
关键词 Boron ions sol-gel method luminescent properties （Eu^3＋,Eu^2＋,SiO2）xerogel rare earths
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Co Content Dependence of Crystal Structure and Specific Magnetization of Fe1-xCo_x-SiO_2 Granules Prepared by Sol-Gel Method 认领 引用
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作者 Guide TANG Wei CHEN +3 位作者 Jianguo ZHAO Denglu HOU Ying LIU Chengfu PAN and Xiangfu NIETo whom correspondence should be addressed E-mail: dlhou@hebtu.edu.cn 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第4期390-390,共1页
The Co content dependence of crystal structure and specific magnetization of Fe1-xCox-SiO2granular solid prepared by the sol-gel method have been studied. It is found that the crystal structure, Iattice parameter and ... The Co content dependence of crystal structure and specific magnetization of Fe1-xCox-SiO2granular solid prepared by the sol-gel method have been studied. It is found that the crystal structure, Iattice parameter and specific magnetization of the FeCo alloy particles depend on the Co content. 展开更多
关键词 SiO x)Cox-SiO2 Granules Prepared by Sol-Gel Method Fe Co Content Dependence of Crystal Structure and Specific Magnetization of Fe
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Preparation and electrochemical performance of Li_2Mn0.5Fe0.5SiO_4 cathode material with sol-gel method for lithium ion batteries 认领 引用
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作者 胡传跃 郭军 +1 位作者 文瑾 彭秧锡 《Journal of Central South University》 SCIE EI CAS 2014年第4期1285-1289,共5页
Li2Fe0.5Mn0.5SiO4 material was synthesized by a citric acid-assisted sol-gel method. The influence of the stoichiometric ratio value of n(citric acid) to n(Fe2+-Mn2+) on the electrochemical properties of Li2Fe0.5Mn0.5... Li2Fe0.5Mn0.5SiO4 material was synthesized by a citric acid-assisted sol-gel method. The influence of the stoichiometric ratio value of n(citric acid) to n(Fe2+-Mn2+) on the electrochemical properties of Li2Fe0.5Mn0.5SiO4 was studied. The final sample was identified as Li2Fe0.5Mn0.5SiO4 with a Pmn21 monoclinic structure by X-ray diffraction analysis. The crystal phases components and crystal phase structure of the Li2Fe0.5Mn0.4SiO4 material were improved as the increase of the stoichiometric ratio value of n(citric acid) to n(Fe2+-Mn2+). Field-emission scanning electron microscopy verified that the Li2Fe0.5Mn0.5SiO4 particles are agglomerates of Li2Fe0.5Mn0.5SiO4 primary particles with a geometric mean diameter of 220 nm. The Li2Fe0.5Mn0.5SiO4 sample was used as an electrode material for rechargeable lithium ion batteries, and the electrochemical measurements were carried out at room temperature. The Li2Fe0.5Mn0.5SiO4 electrode delivered a first discharge capacity of 230.1 mAh/g at the current density of 10 mA/g in first cycle and about 162 mAh/g after 20 cycles at the current density of 20 mA/g. 展开更多
关键词 lithium ion battery Li2Fe0.5Mn0.5SiO4 citric acid assisted sol-gel method cathode
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具有辐射聚合能力的HfO_2/SiO_2溶胶-凝胶玻璃的制备及其X射线光刻性能研究 认领 引用 被引量：2
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作者 赵福华 谢永军 +2 位作者 许素莲 刘刚 付绍军 《高等学校化学学报》 SCIE EI CAS 北大核心 2006年第7期1376-1379,共4页
采用溶胶-凝胶方法制备了一种新颖的具有辐射聚合能力的H fO2/S iO2凝胶薄膜.并采用X射线作曝光光源对薄膜进行了曝光,通过FTIR的测试,分析了薄膜曝光前后的结构变化.结果表明,该材料具有良好的辐射聚合能力.采用XPS分析了薄膜的成分,... 采用溶胶-凝胶方法制备了一种新颖的具有辐射聚合能力的H fO2/S iO2凝胶薄膜.并采用X射线作曝光光源对薄膜进行了曝光,通过FTIR的测试,分析了薄膜曝光前后的结构变化.结果表明,该材料具有良好的辐射聚合能力.采用XPS分析了薄膜的成分,并证实了H f元素的存在.用椭偏仪测试了薄膜的折射率,结果证实,加入H fO2提高了体系的折射率.利用其辐射聚合能力,采用X射线通过掩模板进行曝光,利用曝光部分与未曝光部分在溶剂中的溶解度差,在薄膜上制备了高为0.8μm、周期为1μm的衍射光栅,进一步证实了材料具有良好的辐射聚合能力. 展开更多
关键词 HfO2/SiO2 溶胶-凝胶 辐射聚合 光栅
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基频HfO_2/SiO_2高反射薄膜激光损伤生长特性 认领 引用 被引量：2
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作者 张艳云 马彬 +2 位作者 马宏平 焦宏飞 程鑫彬 《强激光与粒子束》 EI CAS CSCD 北大核心 2013年第9期2275-2280,共6页
以1064nm波长作用下的HfO2/SiO2高反射薄膜为研究对象,研究了高反射薄膜在损伤生长过程中分层剥落初始损伤结构的变化规律、损伤形貌特征和损伤生长阈值等特性。实验结果表明:分层剥落初始损伤结构的横向尺寸随激光能量密度的增加呈分... 以1064nm波长作用下的HfO2/SiO2高反射薄膜为研究对象,研究了高反射薄膜在损伤生长过程中分层剥落初始损伤结构的变化规律、损伤形貌特征和损伤生长阈值等特性。实验结果表明:分层剥落初始损伤结构的横向尺寸随激光能量密度的增加呈分段线性增长,破斑沿纵向拓展的损伤生长阈值是沿横向拓展的损伤生长阈值的2倍以上,初始损伤结构横向尺寸的生长率与能量密度呈指数关系,且生长阈值随着辐照次数的增加显著降低。 展开更多
关键词 HfO2 SiO2高反射薄膜 分层剥落 损伤生长 激光损伤阈值 横向尺寸
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HfO_2/SiO_2多层高反膜脉冲YAG激光预处理机理的研究 认领 引用 被引量：2
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作者 周业为 谢建 +1 位作者 李育德 曾传相 《激光杂志》 EI CAS 北大核心 2000年第2期13-13,16,共1页
本文研究了HfO2 /SiO2 多层高反膜脉冲YAG激光预处理提高抗激光损伤阈值的机理。通过分析和计算 ,我们提出了一种物理模型 ,即热扩散模型。由于扩散结果 ,导致HfO2 膜层的折射率增加 ,致使HfO2 、SiO2 膜层交界处光驻波波峰降低 。
关键词 HfO2/SiO2 多层高反膜 激光预处理 YAG激光
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HfO_2/SiO_2增透膜激光诱导损伤形貌分析 认领 引用 被引量：1
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作者 罗康 蒲云体 +4 位作者 乔曌 刘志超 罗晋 朱基亮 马平 《广州化工》 CAS 2015年第4期90-92,共3页
用电子束蒸发法制备了Hf O2/Si O2增透膜样品,并进行退火。测量未退火样品与退火样品的透射光谱,发现退火样品的光谱明显向短波方向移动,原因是退火后薄膜中的吸附水被去除。使用Nd:YAG激光器在"S-on-1"模式下对样品进行了激... 用电子束蒸发法制备了Hf O2/Si O2增透膜样品,并进行退火。测量未退火样品与退火样品的透射光谱,发现退火样品的光谱明显向短波方向移动,原因是退火后薄膜中的吸附水被去除。使用Nd:YAG激光器在"S-on-1"模式下对样品进行了激光诱导损伤处理。两种样品的损伤形貌均主要是损伤坑。考虑到损伤的成因是基底的亚表面微裂纹中的吸收颗粒吸收激光能量后导致裂纹扩大,最终形成损伤坑。基于这种损伤机制,退火对损伤没有明显影响。通过显微镜在损伤形貌中观察到了冲击波传输形成的波动条纹。 展开更多
关键词 增透膜 激光诱导损伤 损伤形貌 HfO2/SiO2
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Sol-Gel法制备非晶态SiO_2玻璃光纤预制棒“干胶”工艺研究 认领 引用 被引量：1
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作者 张金仲 汤卉 高维丽 《哈尔滨理工大学学报》 CAS 2008年第4期117-120,124,共4页
为采用Sol-Gel法制备低廉的SiO2光纤预制棒芯棒,讨论了以正硅酸乙酯为硅源,乙醇和水的混合物为溶剂,盐酸和甲酰胺为添加剂,用Sol-Gel法制备非晶态SiO2干胶的制备工艺.用XRD衍射仪等进行测试,结果表明,干胶的显微结构为SiO2非晶态,主要... 为采用Sol-Gel法制备低廉的SiO2光纤预制棒芯棒,讨论了以正硅酸乙酯为硅源,乙醇和水的混合物为溶剂,盐酸和甲酰胺为添加剂,用Sol-Gel法制备非晶态SiO2干胶的制备工艺.用XRD衍射仪等进行测试,结果表明,干胶的显微结构为SiO2非晶态,主要化学成分是Si和O.同时探讨了添加剂、热处理温度等制备工艺对生成的非晶态SiO2光纤预制棒"干胶"性能的影响.实验表明,溶胶加热温度在90℃、凝胶热处理温度为110℃、溶液配比为正硅酸乙酯:乙醇:水=1∶4∶8、加入适量的盐酸和甲酰胺,SiO2干胶透明度、纯度和减少裂纹扩展情况最佳. 展开更多
关键词 Sol-Gel法 SiO2光纤预制棒 干胶 添加剂 热处理温度
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Fabrication and Microstructure of SiO_2-GeO_2 Sol-gel Glass Coatings 认领 引用
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作者 敬承斌 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2003年第2期46-48,共3页
SiO 2-GeO 2 sols and gel glass coatings with different contents of germanium dioxide were fabricated.Stable and transparent sols could only be obtained when the content of GeO 2 was under 35%.It is shown by SEM that o... SiO 2-GeO 2 sols and gel glass coatings with different contents of germanium dioxide were fabricated.Stable and transparent sols could only be obtained when the content of GeO 2 was under 35%.It is shown by SEM that only one continuous phase is observed in the coating of 65SiO 2·35GeO 2 and plenty of Ge,O and Si were all found in it.However,the separated phase is found in the coating of 60SiO 2·40GeO 2 and a large number of Ge and O.It is proved by the Raman scattering investigation that the separated phase in the coating of 60SiO 2·40GeO 2 is germanium dioxide.The congeries of hydrolystates of Cl 3GeCH 2CH 2COOH play the main role in the formation of the separated phase when the proportion of GeO 2 is much higher.Si-O-Ge,Si-O-Si,and Ge-O-Ge bonds form in the coating of 65SiO 2·35GeO 2 and this coating is homogenous. 展开更多
关键词 SiO 2-GeO 2 sol-gel coating microstructure
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SYNTHESIS OF MeO-SiO_2:Eu3+,Bi3+LUMINOPUORS BY THE SOL-GEL METHOD AND A STUDY OF THEIR LUMINESCENCE SPECTRA 认领 引用
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作者 Bin LI Changjun OU Yiguang TIAN Hong XIAO Guiqin ZHANG 《Chinese Chemical Letters》 SCIE CAS 1991年第2期167-168,共2页
The luminophors MeO-SiO_2:Eu3+,Bi3+and MeO-SiO_2Bi3+(Me=Mg.Sr)were synthesized at relatively lower temperature by the sol-gel method using the silica sol as a source of silica.The optimum composition and synt... The luminophors MeO-SiO_2:Eu3+,Bi3+and MeO-SiO_2Bi3+(Me=Mg.Sr)were synthesized at relatively lower temperature by the sol-gel method using the silica sol as a source of silica.The optimum composition and synthesis conditions were obtained by studying the excitation and emission spectra and the effects of energy transfer from the Bi3+ions to the Eu3+ions. 展开更多
关键词 SYNTHESIS OF MeO-SiO2 SOL LUMINOPUORS BY THE SOL-GEL METHOD AND A STUDY OF THEIR LUMINESCENCE SPECTRA SiO Bi
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Prepared of Olive Oil Doped SiO2via Sol-Gel Technique 认领 引用
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作者 Fawaz Nasro Saiof Mohammed Alwan Hamza 《Advances in Materials Physics and Chemistry》 CAS 2013年第5期239-243,共5页
Olive oil doped Nanosilica is successfully prepared by wet chemical synthesis method. Samples were analyzed by a variety of techniques, including X-ray diffraction, FTIR, absorption and emission spectrometers to repor... Olive oil doped Nanosilica is successfully prepared by wet chemical synthesis method. Samples were analyzed by a variety of techniques, including X-ray diffraction, FTIR, absorption and emission spectrometers to report the capability of Sol-Gel technology on preparing of silica monolith as a host material for Olive oil, and investigate the effect of converting Olive oil to a solid state on its optical properties. Some absorption bands of Olive oil are disappearing from absorption spectrum of doped silica. Only single strong fluorescence peak was appearing in fluorescence spectrum of pure Olive oil at wavelength around 678 nm which attributed to chlorophylls, while fluorescence spectrum to doped sample shows two strong fluorescence peaks at the wavelength 681 nm and 585 nm which attributed to chlorophylls and Vitamin E respectively. The doping process enhances fluorescence activity of Olive oil through enhancing intensity of the fluorescence peak corresponding to Vitamin E. Absorption and fluorescence spectrums to doped silica sample give a good indication in direction of using Sol-Gel technique to prepare?for Olive oil doped SiO2 as an optical active material. 展开更多
关键词 Sol-Gel SiO2 Olive Oil
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Sol-Gel Preparation of Nanoscale TiO2/SiO2Composite for Eliminating of Con Red Azo Dye 认领 引用
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作者 Abdolreza Nilchi Simin Janitabar-Darzi Somayeh Rasouli-Garmarodi 《Materials Sciences and Applications》 2011年第5期476-480,共5页
A new anatase/SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by mean... A new anatase/SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by means of X-ray diffraction (XRD), X-ray fluorescence spectroscopy (XRF), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) specific surface areas, Thermogravimetry analysis (TGA), Fourier transform infrared (FT-IR), and UV-vis absorption spectroscopy. Thermal phase transformation studies of composite were carried out up to 1100°C which showed the establishment of anatase TiO2 phase. The presence of some tetrahedral coordination of TiO2 species in SiO2 matrix was confirmed by UV-Vis study. The produced TiO2/SiO2 nanocomposite has good photocatalytic properties due to its anatase phase, existence of tetrahedral coordination of TiO2 in the SiO2 matrix and very large surface area. Furthermore, the synthesized anatase/SiO2 shows significant adsorption ability towards Congo Red (CR) azo dye in comparison with the pure commercial TiO2 which is known as Degussa, P25. 展开更多
关键词 TiO2/SiO2 Nanocomposites Sol-Gel Preparation Photocatalyst Congo Red
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