二氧化硅

The rare earth complex dispersed in mesoporous silica displayed characteristic fluorescence emission of the pure rare earth complex, the fluorescence emission was increased, especially for diamine treated mesoporous silica. It showed that MCM-41 could effectively hinder the concentration quenching of Eu〓 ion.

对进入氨基修饰过的介孔二氧化硅中的Eu〓具有更好的荧光性能，说明介孔二氧化硅可以有效地阻止稀土离子的浓度猝灭。

A: Quartz is almost pure SiO2, while pyrex is SiO2 with trace amounts of other elements.

石英玻璃的成分几乎是纯二氧化硅（ SiO2），而派热克斯玻璃是二氧化硅与其它微量元素（ Ca， K， B 等）。

Such a strategy is based on the direct synthesis of molecularly imprinted polymeric fibers using silica capillaries as molds, with silica being etched away after polymerization. The system propazine: methacrylic acid was used as a model for the preparation of molecularly imprinted fibers, and its ability to selectively rebind triazines was evaluated.

这种技术以二氧化硅毛细管为模型直接合成分子印迹聚合纤维，聚合完成后除去二氧化硅。2-氯-4，6-二-1，3，5-三嗪系统：用甲基丙烯酸做模型制备分子印迹纤维，并对其选择性吸附三嗪化合物的能力进行评估。

The article is carrier with grain of 2 oxidation silicon, use ultrasonic chemistry silver-gilt method, preparation gives silver / 2 oxidation silicon is compound grain, undertook token of silver-colored content analysis and XRD, SEM to the product, studied the performance fighting bacterium of compound grain mainly.

本文以二氧化硅颗粒为载体，利用超声波化学镀银方法，制备出银/二氧化硅复合颗粒，并对产品进行了银含量分析和XRD、SEM表征，重点探究了复合颗粒的抗菌性能。

The influences of technic conditions of preparation, such as concentration of sodium silicate, concentration of vitriol, reaction temperature and cocurrent time were studied by orthogonal design experiment.

利用正交设计安排实验，采用并流法制备沉淀二氧化硅，研究实验制备工艺条件硅酸钠浓度、硫酸浓度、反应温度和并流时间对沉淀二氧化硅的BET比表面积的影响。

In the present work, diatomaceous silica samples in some typical deposits of China were studied by using of combined analyses of chemical and spectroscopic methods.

本项目以我国的典型硅藻质二氧化硅样品为研究对象，采用化学分析法与现代谱学新技术相结合的方法，研究硅藻质二氧化硅表面功能基的性质及其与硅藻种属、微结构、微形貌间的关系，分析功能基活性产生的机理及控制因素。

The resules show that the optimal reaction conditions are as follows: tin octoate is used as catalyst; w(SnOct2)lw and w(nano-SiO2)/w is 1:400 and 1:20, respectively; the reaction temperature is 140 CC and the reaction time is 72 h. Under this conditions, composite withM of 1.5091×10^5 was obtained.

结果表明，最优的反应条件为：采用辛酸亚锡为催化剂，催化剂用量和二氧化硅用量分别为丙交酯用量的0.25%和5%，在140℃油浴中，氮气保护下反应72h，可得到重均分子量为1.5091×10^5的聚乳酸纳米二氧化硅复合材料。

Polylactide/ nano-silica composites were synthesized with lactide and modified nano-silica by tin octoate catalyst.

以丙交酯和改性后的纳米二氧化硅为原料，在辛酸亚锡催化作用下，制备了聚乳酸纳米二氧化硅复合材料。

The PMMA/SiO2 hybrid materials with the presence of chemical bond through the reaction of WD-20 with tertraethyl orthosilicate were prepared by in-situ polymerization.

深入研究了偶联剂在聚合物/二氧化硅纳米复合材料中的分散作用，制备了光透过率达90%以上的聚合物/二氧化硅纳米复合材料。

A kind of spherical microporous silica was synthesized by precipitation with the tetraethyl orthosilicate as a silica precursor and the block ploymer P_(123 as a template. The characterizations by the BET, FSEM and XRD showed that the spherical microporous silica has diameter of 3～4 μm, amorphous pore size of 0.9～1 nm and the specific area of 216±

以正硅酸乙酯作硅源，嵌段共聚物为模板剂，采用沉淀法合成均匀的实心球形二氧化硅微孔材料，BET、FSEM和XRD等表面分析手段表征表明，我们合成的二氧化硅微孔材料具有3～4μm的粒径和不规则分布的0.9～1nm的孔径以及216±3.5m2/g的比表面积。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。