Silica AerogelsSiO2气凝胶
1.Silica Aerogels are nano-porous non-crystalline materials with highly effective thermal insulations whose structures can be controlled through preparations.SiO2气凝胶是一种结构可控的新型纳米多孔高效绝热材料。
2.A method to prepare silica aerogels is described.采用溶胶-凝胶技术,以多聚硅(E-40)为源,通过表面修饰工艺,在常压条件下制备了SiO2气凝胶。
3.A new method to prepare hydrophobic silica aerogels as effective adsorptive material was introduced.以多聚硅E-40为硅源,采用溶胶-凝胶法,通过表面修饰等工艺,在常压条件下制备了高气孔率的疏水性SiO2气凝胶。
3)silica aerogelSiO2气凝胶
1.Silica aerogel is prepared from TEOS through sol-gel process,and the xonotlite-silica aerogel nanoporous super insulation sheets are made of the composition of silica aerogel and xonotlite,via vacuum impregnating,then dried by supercritical drying technique.以正硅酸乙酯为硅源,利用溶胶-凝胶法制备SiO2气凝胶先驱体,而后采用真空浸渍工艺将SiO2气凝胶先驱体与硬硅钙石复合,最后经超临界干燥技术制备出了硅酸钙复合纳米孔超级绝热板材。
2.Using cheap water glass as silica source,monolithic silica aerogel was prepared by sol-gel process and supercritical drying technique,the effect of preparing conditions on the gelling time of it was investigated.以廉价水玻璃为硅源,经溶胶-凝胶工艺和超临界干燥技术制备了SiO2气凝胶块体,并研究了制备条件对其成胶时间的影响。
3.Silica aerogel films were prepared via three different ambient pressure drying process by sol-gel method.采用溶胶-凝胶法,通过三种不同的常压干燥工艺在玻璃表面制备了SiO2气凝胶薄膜,利用扫描电镜(SEM)、红外光谱(FTIR)、紫外／可见光谱及接触角测试对气凝胶薄膜的微观形貌、可见光透过率和疏水性进行了分析。
4)SiO_2-aerogelSiO2气凝胶
1.By using experimental method,the moisture absorption and desorption characteristic of SiO_2-aerogel(nano-structured material) was studied and was compared with silica gel.对一种纳米级材料———SiO2气凝胶的吸、放湿性能及规律进行了实验研究,并与普通变色硅胶的调湿性能进行了实验比较。
5)SiO_2 aerogelSiO2气凝胶
1.After a reaction time of about 100min at room temperature, the silica sol was transformed into solgel, which was dried by supercritical drying technique to obtain wood-nano-SiO_2 aerogel.在催化剂存在下,使正硅酸乙酯与乙醇-水溶液混合制备硅醇溶胶,迅速将其分别注入到西南桤木和紫椴木材中,令其在室温下反应100min左右得到木材-凝胶,然后采用超临界干燥技术制备木材-SiO2气凝胶。
2.The SiO_2 aerogel/chitosan composite materials were prepared by ambient drying method under electrostatic effect.用环境干燥法,通过静电作用制备了SiO2气凝胶/壳聚糖复合材料。
6)SiO2 aerogelsSiO2气凝胶
1.Hydrophobic SiO2 aerogels prepared via sol-gel process using silica sol were modified trimethylchloro-silane(TMCS) for hydrophobic modification.采用三甲基氯硅烷(TMCS)对硅溶胶制备的湿SiO2气凝胶进行表面疏水改性处理,研究了TMCS与孔洞中水的摩尔比对气凝胶的疏水改性作用与性能,用红外光谱法检测了疏水性改性的SiO2气凝胶,发现气凝胶表面的-OH被-OR基团取代,以此构建SiO2气凝胶的疏水性改性机理及模型,试验结果表明,TMCS与孔洞中水的摩尔比控制在0。
2.Surface of nano SiO2 aerogels are modified by admixture of n-butyl alcohol,n-hexane and chlorotrimethylsilane(TMCS).2nm,存在小于2nm的微孔,并根据实验数据采用FHH模型法计算得到SiO2气凝胶的表面分形维数Ds=2。
延伸阅读
Sds-聚丙烯酰胺凝胶电泳凝胶电泳sds-聚丙烯酰胺凝胶电泳（sds-page，sodium dodecyl sulfate-polyacrylamide gel electrohoresis）在有去污剂十二烷基硫酸钠存在下的聚丙烯酰胺凝胶电泳。sds-page只是按照分子大小分离的，而不是根据分子所带的电荷和大小分离的。
