二氧化硅

And they can be prepared as molecular sifter, which are widely used in catalyst, ion-exchanging, material-making up and so on.

多孔二氧化硅的孔径在2～50nm，因此属于介孔材料，可以广泛应用于石油、化工和环保等领域。

Under heat and pressure, the silica forms a solid gel, trapping the remaining water within its structure.

在高温和压力下，形成一个稳固的二氧化硅凝胶，其余水围困在其结构。

The formation of complexes in silica gel was confirmed by the luminescence excitation spectra.

在二氧化硅凝胶中配合物的形成可以通过电致发光光谱来证明。

Such silica can react when added to cement in the presence of water.

这样的二氧化硅在存在水的情况下加到水泥中时。

This paper is concerned with preparation of nanometer silica.

叙述了纳米二氧化硅的制备研究。

A new method for the preparation of gene carriers based on silica micro-particles was reported.

建立了一种基于二氧化硅微颗粒的基因载体的制备新方法。

For nanometer sized silica, there are a large number of experimental studies, but no systematic theoretical research for it.

对于纳米二氧化硅，已经有了大量的实验研究，但还没有系统的理论研究。

Silicic acid kind stone mainly consist of silicon dioxide or quartz fine grain.

硅酸类石材主要由二氧化硅或者石英状的微粒构成。

There is a protective coating of silicon dioxide on the silicon carbide.

在棒的表面有一层二氧化硅保护涂层。

This effect will last until you wash your face and the invisible silicon dioxide is removed.

这一效应将持续到你洗你的脸，是无形的二氧化硅拆除。

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％。