二氧化硅

The results showed that there was a more better effect of filmformation and absorbency to use poly 1788 as an adhesive and polyvinyl pyrrolidone(K:90) as a hydrophilic polymer. The silicon dioxide with particle size 0.3-1 μm as a inorganic pigment had a better absorbency. The polyethylene glycol modified with ethylenediamine had a more better characteristic of dye immobilization, absorbency and definition than the polyethylene glycol modified with diethylenetriamine, of which the polyethylene glycol of molecular weight of 400 modifiedwith ethylenediamine had more best performance.

研究结果表明：采用聚乙烯醇1788作黏合剂、聚乙烯吡咯烷酮(K值为90)作亲水性高分子可得到比较理想的成膜效果和吸墨效果；粒径分布范围在0.3-1 μm的二氧化硅作为无机颜料具有较好的吸墨性能；用乙二胺改性的聚乙二醇比用二乙三胺改性的聚乙二醇具有更好的固墨性、吸墨效果以及清晰度，其中乙二胺改性的分子量为400的聚乙二醇所得到的烷基多胺的效果为最好。

Dust from brick cutting may contain respirable particles, which may also include harmful silica dust.

切割砖块时产生的灰尘中含有可吸入的颗粒，它含有害的二氧化硅。

In order to improve the interfacial adhesion between the matrix and inorganic particles, the SiO2 nanoparticles were modified with polymethyl methacrylate and silicane couplant KH507 respectively, and then the SiO2/PVC composites were prepared via the melt blending method. The microstructure and mechanic properties of SiO2 nanoparticle filled PVC composites were investigated by FT-IR.

利用表面原位接枝聚合在纳米二氧化硅颗粒表面引入聚甲基丙烯酸甲酯高分子链段，用共混法制备了nano-SiO2/PVC复合材料，研究了不同界面特性时SiO2/PVC复合材料的力学性能。

Summarize the condition that the silicified wood forms, must possess: The volcano breaks out or other reasons make the stratum subside, the trees are buried deeply, the environment close, bear the high pressure, stand the infiltration of the high-temperature karst taking oxidizing silicons two times as principal ingredients, go through it with the endless long river that must be written every year, just reach the silication right fruit after all.

概括硅化木形成的条件，必须具备：火山暴发或其他原因使地层陷落、树木深埋、环境封闭、承受高压，并经受以二氧化硅为主要成分的高温岩溶的浸润，历经以千万年记的漫漫长河，才终达硅化正果。

Based on the ottimizing, we have obtained silicious ZSM-5 zeolite with less than 500 nm crystal size and as high as 84% product yield based SiO2 from a gel of SiO2/Al2O3 = 170, which meant a high possibility of commercial application.

物料恒算表明，在本文所建立的优化合成体系中，从SiO2/Al2O3 =170的凝胶中水热晶化出小于500 纳米的小晶粒ZSM-5沸石的二氧化硅收率约为84%。在晶化母液循环使用的情况下，上述体系具备了工业化应用的可能。

Proton exchange membranes based on polyacrylonitrile /silica composites doped with heteropolyacids such as phosphotungstic acid or silicotungstic acid were prepared by sol-gel method.

采用溶胶－凝胶法制备了杂多酸掺杂聚丙烯腈－二氧化硅(PAN-SiO2)复合质子交换膜，并研究了其质子导电性能、保水能力和抗化学氧化性能。

In this paper,a novel organic/inorganic composite electrolyte membrane based on Poly,silicotungstic acid(STA,SiO_2·12WO_3·26H_2O) and silica-sol was prepared.

26H2O和二氧化硅的新型有机/无机复合电解质膜。

Poly silica hybrids were prepared through polymerization, condensation and sol gel processes of the mixture of methyl methacrylate, poly and a small amount of coupling agent methacryloxylpropyl trimethoxy siliane in tetrahydrofuran.

采用溶胶-凝胶技术，以硅酸钠为原料制备聚硅酸/四氢呋喃溶胶，再与甲基丙烯酸甲酯及少许偶联剂甲基丙烯酰氧丙基三甲氧基硅烷(MPTMS 混合，经聚合、缩合和溶胶-凝胶过程制备了有机/无机两相间有— C—Si—O—键的杂化材料——聚甲基丙烯酸甲酯/二氧化硅(PMMA/Si O2 )。

TEM images showed that the silica particles remained unaggregated after surface modification.

著者文摘二氧化硅纳米粒子丙烯酸酯甲苯-2，4-二异氰酸酯表面修饰

The latter has only one PL band peaking at about 1.48eV,while the former is a double-band PL spectrum with peaks at both 1.48eV and 1.97eV.The electroluminescenceform the Au／scored Si-rich SiO2 film／p-Si sample is about 6 times in intensity of that of the Au／unscored one.

未刻划样品的PL谱只有一个峰，位于840nm(1.48eV)，而刻划样品的PL谱是双峰结构，峰位分别位于630nm(1.97eV)和840nm.800℃退火的刻划富硅二氧化硅/p-Si样品在背面蒸铝制成欧姆接触和正面蒸上半透明金电极后在正向偏压10V下的电致发光强度约为同样制备的未经刻划样品在同样测试条件下的EL强度的6倍。

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％。