二氧化硅

The carbonaceous alcosol and the silica alcosol were prepared respectively by using aqua-mesophase and tetraethoxysilane as starting materials. Then the two alcosols were mixed and dried in open air and under supercritical fluid conditions to form binary carbonaceous-silica xerogel powders and aerogel powders respectively.

以正硅酸乙酯和炭质水性中间相为原料，分别制得了炭质醇溶胶和硅醇溶胶，将二者进行混合后再利用常压干燥法和超临界流体干燥法分别制备了二元炭质-二氧化硅干凝胶和气凝胶粉末。

Sure enough, Spirit's alpha particle X-ray spectrometer found Stapledon to be rich in silica, too.

不出所料，勇气号的α粒子 X 射线分光计发现" Stapledon "富含二氧化硅。

In the samples treated by hydrothermal technique there are main crystalline phase HA andp-TCP ,there are CaCO3 and CaHPO4 also, there is no CaSiO3. SiO2 may exist as amorphism. In the samples sintered at 1050℃ there are main crystalline phases HA andp-TCP, a small amount of CaSiOs.

采用XRD分析样品物相，其中所有样品中都含有HA和β-TCP，在低温水热处理后，主晶相为HA和β-TCP，还含有CaCO_3和CaHPO_4，没有发现硅酸钙(CaSiO_3)的存在，二氧化硅可能以非晶态的形式存在。

The methods of preparation of organosilicon from amorphous silica have been studied.

本文研究了由无定形二氧化硅直接合成有机硅化合物的方法。

You should also include folic acid, biotin and silica in your diet.

您还应该包括叶酸，生物素和二氧化硅在您的饮食。

Analyses of pH, conductivity, and dissolution of silica were carried out in order to study the purification of Stber silica sols.

通过pH值、电导率和二氧化硅解离量的测定，研究了Stber二氧化硅溶胶的提纯过程。

Analyses of pH, conductivity, and dissolution of silica were carried out in order to study the purification of Stober silica sols.

通过pH值、电导率和二氧化硅解离量的测定，研究了Stfber二氧化硅溶胶的提纯过程。

Spherical silica was prepared from ordinary silica by oxygen-acetylene flame method.

以普通角形二氧化硅为原料，采用氧-乙炔火焰法制备出球形二氧化硅。

In the present dissertation, a surfactant-templated mesoporous silica molecular sieve with high pore volume, high porosity and narrow bimodal mesopore size distribution was synthesized for the first time in a reaction system, which was used usually in the synthesis of mesoporous MCM-41 molecular sieves, by a judiciously controlled two-phase sol-gel processing under basic conditions.

在本论文中，我们通过对一个通常用于制备介孔MCM-41分子筛的反应体系中正硅酸乙酯水解与缩合反应相对速率的精确调控，首次在弱碱性体系中合成了一种具有高孔隙率、大孔体积和双介孔孔分布特征的新型二氧化硅分子筛材料，简记为BMS，并对BMS二氧化硅分子筛中双介孔结构形成的原因及各种可能对其结构和性质产生影响的合成因素如Ammonia／silica摩尔比、组分浓度的变化、表面活性剂烷基链长度的调节、辅助有机物均三甲苯的引入、催化剂的结构和性质、溶剂和助溶剂的极性和用量、老化和干燥条件的变化及合成后水热处理等，利用不同的测试手段如XRD，SEM，TEM，〓Si MAS NMR，TG-DTA，N〓吸附测试等进行了系统的表征研究。

Liquid glass is composed of almost pure silicon dioxide, the chemical constituent of quartz or silica, basically like ordinary glass.

液态玻璃几乎是由纯二氧化硅构成的，二氧化硅就是石英或硅石中的化学成分，基本上象普通玻璃一样。

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％。