MTES—TEOS先驱液水解—缩聚机理及其凝胶玻璃性能

针对现有复合固态染料激光介质光学加工性能差和残余溶剂小分子引起严重非镉射跃迁而降低有机光学活性物质量子产率的缺陷。本文应用甲基三乙氧基硅烷ＣＨ３Ｓｉ（ＯＣ２Ｈ５）３（ＭＴＥＳ）作为有机改性剂,研究了甲基改性ＳｉＯ２凝胶玻璃基质及染料掺杂复合激光介质的制备工艺以及对有机光学活性物质的热学和荧光性能的影响。结果表明,由于甲基的影响,缩聚反应速度工艺以及对有机光学活性物质的热学和荧光性能的影响。结果表明     

溶胶—凝胶法在激光及非线性光功能材料上的应用

综述用溶胶－凝胶法制得的凝胶玻璃以及有机改性硅酸盐（Ｏｒｍｏｓｉｌ）作为光功能基质材料在半导体微晶量子点掺发、极机染料掺杂以及稀土离子掺杂方面的应用，并结合作者近期的工作讨论了其在非线性光学、固态连续可调激光器、固态激光对掸锁模以及激光玻璃方面的应用和发展。     

溶胶－凝胶法在激光及非线性光功能材料上的应用

综述用溶胶－凝胶法制得的凝胶玻璃以及有机改性硅酸盐（Ｏｒｍｏｓｉｌ）作为光功能基质材料在半导体微晶量子点掺杂、有机染料掺杂以及稀土离子掺杂方面的应用，并结合作者近期的工作讨论了其在非线性光学、固态连续可调激光器、固态激光对撞锁模以及激光玻璃方面的应用和发展．     

MTES-TEOS先驱液水解-缩聚机理及其凝胶玻璃性能研究

针对现有复合固态染料激光介质光学加工性能差和残余溶剂小分子引起严重非辐射跃迁而降低有机光学活性物质量子产率的缺陷 ,本文应用甲基三乙氧基硅烷 CH3 Si(OC2 H5 ) 3(MTES)作为有机改性剂 ,研究了甲基改性 Si O2 凝胶玻璃基质及染料掺杂复合激光介质的制备工艺以及对有机光学活性物质的热学和荧光性能的影响。结果表明 ,由于甲基的影响 ,缩聚反应速度成为以纯 MTES为先驱物制备光学均匀复合固态染料激光介质的关键控制因素 ,甲基改性复合固态染料激光介质可进行较高温度热处理 ,经适当温度热处理后 ,染料的荧光强度有较大提高。     

若丹明6G在TEOS-GPTMS系统凝胶玻璃中的光谱特性与稳定性能

研究了预掺杂有机激光染料若丹明６Ｇ的ＴＥＯＳ－ＧＰＴＭＳ系统凝胶玻璃复合激光介质的光谱学性质和各种稳定性能,揭示了有机改性剂改善凝胶玻璃光学透过性能与强化 产分子无辐射弛豫的双重作用,探讨了热褪色和光褪色各自不同的反应机制和影响因素,证明了凝胶玻璃基质复合固态染料激光介质在受激辐射过程中以染料的热褪色,即热氧化反应的机理破坏为主。     

有机染料掺杂的凝胶基质的制备及其性能

论述了适合于有机染料掺杂的凝胶基质ＴｉＯ２－ＭＭＡ－ＧＬＹＭＯ的制备过程,并将７种染料掺入此ＯＲＭＯＳＩＬ基质中,用Ｚ扫描的方法测试了样品的光学非线性折射率,在这些材料中获得了较大的ｎ２数值,将ＤＣＭ染料掺杂到ＴｉＯ２－ＭＭＡ－ＧＬＹＭＯ基质中,在５３２ｎｍ激光泵浦下获得了５９０．７－６５４．３ｎｍ的连续可调谐激光输出,实验发现,ＴｉＯ２－ＭＭＡ－ＧＬＹＭＯ基质具有较好的机械性能,热性能及光学性能     

有机-无机纳米复合材料的制备、性能及应用

综述了有机-无机纳米复合材料的最新发展,包括该类材料的制备方法、性能研究和应用前景.纳米复合技术主要有3种:溶胶-凝胶法、嵌入法和纳米微粒填充法.纳米复合材料的光学和磁学等性能可用Maxwell形态理论、层状结构理论和分形结构理论等来研究.这类材料已在力学、热学、电学、磁学、光学、宇航和生物仿生等领域表现出广阔的应用前景.     

二氧化硅气凝胶的制备和应用研究

三维纳米网络结构的SiO2气凝胶具有许多独特的性能,在光学、热学、声学、微电子学、高功率激光等领域具有广阔的应用前景,是目前材料科学家研究的热门材料之一.简要评述了SiO2气凝胶的制备技术和应用前景.     

掺Yb^3硼磷酸盐玻璃物理和光谱性能研究

通过熔融法制得了一种新型掺Yb^3＋的（60-X）P2O5-xB2O3-40ZnO（x=5，10，15，20，25，30％（摩尔分数））系统激光玻璃，并分析了B2O3含量对玻璃结构、物理性能和光谱性能的影响。结果表明，随B2O3含量增加，玻璃由链状变为类似石英玻璃的三维网络结构，力学和热学性能逐步得到改善，并在20％（摩尔分数）B2O3时具有最佳值，当B2O3含量超过20％（摩尔分数）后，玻璃中[BO3]三角体含量开始增多，结构变得松散，力学和热学性能变差，当B203含量达到30％（摩尔分数）时玻璃发生了分相现象。随B2O3含量增加，积分吸收截面在3．77-4．11×10^4pm^3之间，受激发射截面在0．726-0．816pm^2之间，荧光寿命在0.903-0.965ms之间，增益系数在0．662-0.737pm^2．ms之间，最小泵浦强度在1．128-1．398kW／cm^2之间变化。这类硼磷酸玻璃有望成为高平均功率固体激光器的候选基质。     

一种有机掺杂体系的光致发光及薄膜电致发光研究

将具有薄膜电致发光（ＴＦＥＬ）性能的有机络合染料８－羟基喹啉铝（Ａｌｑ３）掺以染料罗丹明６Ｇ（Ｒ６Ｇ），用真空热蒸发的方法获得了峰值波长５７５ｎｍ的黄色直流电致发光（ＥＬ）。通过对不同掺杂浓度的粉末，溶液，薄膜样品及电致发光器件的光谱及寿命测量和对比，证实了能量传递的存在并初步探讨了可能的途径。同时发现掺杂器件ＥＬ谱的形状随驱动电压升高发生明显的改变，基质（Ａｌｑ３）的发射（相对于掺杂剂Ｒ６Ｇ的发射）明显增强，对这一现象产生的原因作了分析，并由此讨论了有机掺杂ＴＦＥＬ中复合，发射区域等问题。     

Compatibility enhancement of polyimide-silica hybrid sol-gel materials without incorporation of silane-coupling agent

A facile route has been developed to enhance compatibility between organic polyimide matrix and dispersed phase of inorganic silica particles without addition of conventional silane-coupling agent. The as-prepared hybrid sol-gel materials having reduced size of SiO2 particle dispersed in polyimide matrix were successfully synthesized through pre-catalyzed sol-gel route using an organic diamine base. The PI-silica hybrid materials through conventional polyamic acid-catalyzed sol-gel route with/without silane-coupling agent were also prepared for comparative control studies. Morphological feature of as-prepared sol-gel materials prepared from three different approaches was also compared based on the studies of transmission electron microscopy. Effects of the material composition, in three different catalyzed routes, were investigated by thermal stability, mechanical strength, optical clarity, gas barrier and water absorption measurements of polyimide and a series of polyimide-silica hybrid sol-gel materials, respectively.     

丙烯酸树脂/TiO2有机-无机杂化材料的力学、热学和光学性能研究

采用溶胶-凝胶法成功制备了均匀透明的丙烯酸树脂/TiO2有机-无机杂化材料.通过动态力学分析仪(DMA)、电子拉力机(Instron Tester)、热失重分析仪(TGA)和紫外可见光谱(UV-VIS)等手段表征了杂化材料的力学、热学和光学性能.结果发现丙烯酸树脂与TiO2杂化后,聚合物的力学性能、热稳定性和紫外屏蔽性能均有显著提高.与原位聚合法相比,共混法合成该杂化材料可获得更优异的力学性能.增加丙烯酸树脂中的丙烯酸含量能显著降低相分离,从而使其各种性能,特别是力学性能得以提高.     

溶胶-凝胶技术制备光化学杂化材料

溶胶 -凝胶技术是制备有机 -无机杂化材料的重要手段 ,在光致变色、光纤传感和发光等光化学杂化材料制备方面应用前景广阔。提高光致变色染料的稳定性、制备溶胶 -凝胶光纤及降低杂化材料羟基含量是目前的研究重点。     

有机硅溶胶-凝胶防腐蚀涂层研究进展

有机硅溶胶-凝胶涂层是指以烷基烷氧基硅烷为前驱体通过溶胶-凝胶技术制备的涂层。有机硅是分子水平上的有机-无机杂化分子,因此有机硅溶胶-凝胶涂层兼具了有机材料和无机材料的性能,并且能通过合理的调控有机和无机成分来获得所需的性能。其热稳定、耐刮擦性与无机材料的结合性能明显高于普通的有机材料,柔韧性与有机材料的结合性能明显高于一般的无机涂层。近年来,这种新型的、具有特殊性能的涂层被广泛研究用来保护金属材料(如铝、铁、镁、铜基材料)。介绍了有机硅溶胶-凝胶涂层涉及的基本反应、硅烷在金属表面上的成键机理以及在不同金属上的应用等方面的研究进展,并展望了有机硅溶胶-凝胶涂层应用前景及未来的研究方向。     

Fullerenol-containing Materials Derived by Sol-gel Processing

Water soluble fullerenols were synthesized and incorporated in SiO2, SiO2-TiO2, GPTMS-SiO2, GPTMS-ATPS inorganic and organic-inorganic materials by sol-gel processes. The maximum concentrations of C60(OH)n and C70(OH)n in the obtained SiO2 gels were estimated to be about 0.6% and 1.5% in weight, respectively. The characteristics of the UV/visible spectra of fullerenols in H2O and various gels were measured and compared. The thermal stability of fullerenols in gels was investigated with differential thermal analysis (DTA). The results indicate that the absorption features of fullerenols in solid gels are similar to those in H2O and the fullerenols in SiO2 are stable at 400℃. The optical limiting effect of the fullerenols was investigated preliminarily.     

纳米纯丙胶乳制备TiO2-SiO2杂化材料的研究

用溶胶-凝胶法制得的纳米TiO2-SiO2溶胶，与纳米级的纯丙微胶乳直接共混，制备了聚丙烯酸酯／TiO2—SiO2纳米复合胶乳。用红外光谱（FT—IR）、热重分析仪（TGA）和紫外-可见光谱仪（UV—Vis）分别表征了纳米复合胶膜的化学结构及形态、热学和光学性能。实验证实，该纳米杂化材料具有优异的紫外线屏蔽作用和热稳定性。     

溶胶凝胶法在聚合物/无机纳米复合材料中的应用

本文对溶胶凝胶法在聚合物/无机纳米复合材料中的应用进行了综述.并对溶胶凝胶法在橡胶增强、光学仪器、功能化涂层以及其它领域中的应用进行了具体的讨论.指出溶胶凝胶过程工艺条件的优化以及分散介质范围的扩大将是溶胶凝胶法在聚合物/无机纳米复合材料中应用的发展方向.     

Long-term durability of sol-gel porous coatings for solar glass covers

The application of antireflective coatings to the glass covers of solar thermal collectors, allows to increase the efficiency of the whole system. In this sense, sol-gel silica porous coatings have been deposited on borosilicate glass and solar transmittance values as high as 0.97 have been obtained. The densification process of the films has been studied and the optimal heat treatment conditions have been established. The durability of the materials used in solar systems is a key point since they should keep their initial properties during the operation life-time. In this work, the stability of the optical properties of the films after 2200 h at 50 °C under condensation exposure has been achieved, thanks to the application of a hydrophobic treatment to the coating surface.     

Interfacial Structure of Nanocrystalline SnO2 and SiO2-doped SnO2

Tindioxideisoneofthemostimp0rtantmaterialsforsens0rs.Inthisletter,theinterfacialstructuresofn-SnO2andn-Si-SnO2(d0pedwith5wtpctSiO2)samplespreparedbythesol-gelpr0cesshavebeenin-vestigatedbyX-raydiffraction(XRD),p0sitronlife-timespectr0sc0pyand119SnM6ssbauerspectr0scopy.Variati0nsofgrainsizeforn-SnO2andn-Si-SnO2sampleswithsinteringtemperatureshowthatthegrowthhastw0stageswithincreasingtempera-ture.Thecrystallizationtemperatureisab0ut5O0'C.Whenthesinteringtemperaturewaslowerthanthecrystall…     

Biochemically active sol-gel glasses: The trapping of enzymes

We describe the preparation and properties of a biochemically active sol-gel glass, obtained by the enzyme alkaline phosphate (ALP) in a polymerizing tetramethoxysilane. The immobilized purified ALP from bovine intestinal mucosa had a 30% activity yield and an improved stability to thermal deactivation compared to a solution. The composite bioactive glass was preserved in water at room temperature for two months without loosing activity. A non–Michaelis–Menten kinetics was observed. The concept of preparing bioactive materials by the sol-gel method seems to be general. Thus, other enzymes (chitinase, asparatase, β-glucose) were successfully trapped.