二氧化硅

Scanning electron microscopy,transmission electron microscopy,circular dichroism and small-angle X-ray diffraction were used to analyze the aggregation mode of CSG in the organogel phase.A hierarchical self-assembly model was proposed to explain the transition from molecular to primary and secondary structure.It is shown from our results that CSG can aggregate into a micellar fibril nanostructure with high length-to-width ratio which is bundled and entangled to form a three-dimensional(3D) network that immobilize the fluid component probably by surface tension.Moreover,sol-gel polymerization of tetraethoxysilane was carried out using CSG in the gel phase.

通过扫描电镜(ScanningElectron Microscopy，SEM)、透射电镜(Transmission Electron Microscopy，TEM)、圆二色谱(Circular Dichroism，CD)和小角X—射线衍射仪(Small-angle X-rayDiffraction，SAXRD)考察CSG分子自组装行为结果表明，CSG形成的聚集体具有多级结构：首先CSG通过手性堆叠自组装形成直径在9—10nm的细纳米纤维，这些细的纳米纤维再以不规则的六方堆积的方式进行排列，构成直径在40—100nm的粗纳米纤维(即细纳米纤维的&捆束&)，最后粗纳米纤维互相粘连形成三维网络状结构，使有机溶剂&固定&，从而形成凝胶；以CSG有机凝胶为模板，四乙氧基硅烷为前体，通过溶胶—凝胶聚合的方法制备了直径大约为100nm的二氧化硅纳米管。3。

A simple one-step procedure was described for the synthesis of mesoporous monolith and composite sphere, in which hydrolyzation of tetraethyl orthosilicate and polymerization of urea with formaldehyde occurred at the same time.

利用酸性条件下正硅酸乙酯的水解和脲醛树脂的聚合反应同时一步原位进行的方法合成了二氧化硅复合粉体(包括核壳微球结构和网状结构)和块体凝胶材料。

Cellfood Essential Silica Formula starts with sodium silicate; then, through a proprietary process, it's transformed into a special form of orthosilicic acid.

二氧化硅 Cellfood 基本公式开始水玻璃，然后通过一个专有的过程中，它变成一种特殊形式的 orthosilicic 酸。

Contains pure silica as orthosilicic acid and Cellfood (a proprietary ionic blend of 78 minerals, 34 enzymes, 17 amino acids, electrolytes and dissolved oxygen).

包含纯二氧化硅作为 orthosilicic 酸和 Cellfood （专有离子结合78矿物质， 34酶， 17种氨基酸，电解质和溶解氧）。

Silica ; Phosphomolybdic acid ; Methanol ; Decomposition reaction ; Laser stimulated surface reaction ; Laser parameter

二氧化硅；磷钼酸；甲醇；分解反应；激光表面反应；激光参数

Some evidences prove that the viscosity of straw soda pulping black liquor will be reduced after it is circulated for several times in the cooking, and the contents of silica and polyose are decreased.

结果表明，随着黑液循环达到平衡，抽提的黑液黏度下降，黑液中二氧化硅含量以及聚糖含量减少。

In addition, highly pozzolanic ash can be produced by means of controlled combustion, when silica is kept in non-crystalline form and cellular structure.

此外，高火山灰性灰可以通过控制燃烧来产生，此时，二氧化硅保持在非结晶形式和蜂窝状结构。

Compositions containing additions of SiO2 and Y2O3 did not show any densification after pressureless sintering, due to the high viscosity and extensive volatilisation of the liquids formed at the sintering temperature.

成分含增补的二氧化硅和氧化钇没有出示任何致密化后，无压烧结，由于高粘度和广泛挥发的液体形成于烧结温度。

The combined capacity for siloxane and pyrogenic silica is planned to be approximately 200,000 metric tons per year.

该硅氧烷和气相二氧化硅工厂合作项目的一期工程已于2008年11月中旬完工并投入运营。

Free silica in geological exploration dust is measured by both Xray diffraction and pyrophosphoric acid methods.

对粉尘中游离二氧化硅含量进行了X线衍射法和焦磷酸消化法的对比测定。

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％。