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silica precursor
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  硅前体
     Silica precursors mainly affect the rate of silica formation. For a given silica precursor,especially organic silica precursor,the pH value of solution,prehydrolysis time,concentration of silica precursor,reaction time,reaction temperature and stirring rate,are all the factors controlling the silica formation.
     硅前体主要影响硅胶形成的动力学速度,对于一定的硅前体,尤其是有机硅前体,溶液的pH、预水解时间、硅前体的浓度、反应时间、反应温度和搅拌速率等都是控制硅胶产物形成的因素。
短句来源
  “silica precursor”译为未确定词的双语例句
     MoO 3/SiO 2 catalyst was prepared by sol gel method at low temperature, in which ammonium heptamolybdate and tetraethoxysilane (TEOS) were used as molybdenum and silica precursor, respectively. The catalyst samples were characterized by N 2 adsorption, XRD and FT IR.
     以sol gel法制备了MoO3 /SiO2 催化剂 ,并用BET比表面积测定 ,XRD和FT IR等手段对催化剂进行了表征 ;
短句来源
     A kind of spherical microporous silica was synthesized by precipitation with the tetraethyl orthosilicate (TEOS) 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±3.5 m~2/g.
     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.
短句来源
     The main results are as follows:Nanocomposites with γ-Fe_2O_3 nanoparticles uniformly dispersed in silica matrix were successfully synthesized using tetraethylorthosilicate (TEOS) as a silica precursor and iron nitrate as ferric oxide precursor. However, when iron chloride was used as precursor, hematite was obtained in the final composite.
     具体研究内容如下:以硝酸铁和正硅酸乙酯分别作为氧化铁和SiO_2的前驱体,通过溶胶-凝胶工艺成功制备了γ-Fe_2O_3/SiO_2纳米复合体。
短句来源
     The MSU typed mesoporous organosilica with organic methyl, vinyl, and phenyl functionals were prepared by using inexpensive sodium silicate and organotrialkoxysilane as the silica precursor and nonionic polyethyleneoxide AEO9[C11 15H23 31(CH2CH2O)9H] as the structure directing agent.
     采用有机硅氧烷(RTES)与硅酸钠(Na2SiO3)共水解缩聚合成有机官能化的MSU型硅基中孔材料.
短句来源
     Nanocomposites with γ-Fe2O3 nanoparticles uniformly dispersed in silica matrix were successfully synthesized by using tetraethylorthosilicate (TEOS) as silica precursor and iron nitrate as ferric oxide precursor.
     以硝酸铁和正硅酸乙酯分别作为氧化铁和SiO2的前驱体,通过溶胶-凝胶工艺制备了γ-Fe2O3/SiO2纳米复合粉体.
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  相似匹配句对
     Preparation of Ultrafine Aluminum-silica Catalyst Precursor
     超细硅铝催化剂前驱体制备研究
短句来源
     Silica,10;
     白炭黑,10;
短句来源
     silica 40;
     白炭黑  40 ;
短句来源
     Silica sol was prepared using TEOS as the precursor and HNO3 as the catalyst.
     以正硅酸乙酯为前驱体,硝酸作为催化剂,制备了SiO2溶胶.
短句来源
     Mining Earthquake and Its Precursor
     矿震及其前兆初探
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  silica precursor
Simultaneously, a transesterification reaction between 1-octanol and TMOS grafted octyl groups on the silica precursor.
      
It was found that the enzyme accelerated the gelation kinetics, hence was participating in some way to the hydrolysis of the silica precursor.
      
An organic-inorganic silica precursor suitable for the sol-gel synthesis in aqueous media
      
An Organic-Inorganic Silica Precursor Suitable for the Sol-Gel Synthesis in Aqueous Media
      
Hexagonal mesoporous silica (HMS) was prepared at ambient temperature by using dodecylamine (DDA) as the surfactant and tetraethyl orthosilicate (TEOS) as the silica precursor.
      
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Supported and unsupported silica membranes were prepared by sol-gel process from both TEOS and colioidal silica precursors. There was no pores larger then 1.7nm for unsupported silica membranes obtained from TEOS precursor. The mean pore diameter was 7.5nm for unsupported silica membranes obtained from colloidal silica. Difference of pore size could be mainly attributed to different shapes and growth moulds of polymeric molecules in the sol-gel process. Supported silica...

Supported and unsupported silica membranes were prepared by sol-gel process from both TEOS and colioidal silica precursors. There was no pores larger then 1.7nm for unsupported silica membranes obtained from TEOS precursor. The mean pore diameter was 7.5nm for unsupported silica membranes obtained from colloidal silica. Difference of pore size could be mainly attributed to different shapes and growth moulds of polymeric molecules in the sol-gel process. Supported silica membranes with thickness of 15 pm and without large defaults were prepared born TEOS precursor on α-Al2O3 supports without intermediate zone. Percent rejection of BSA was determined to be 75.8%. Nitrogen permeability measurement of the silica membranes on the α-Al2O3 supports with intermediate zone showed that supported silica membranes had Knudsion diffusion characterization.

本文用TEOS和硅溶胶作原料,用溶胶一凝胶法制备了无支撑体和有支撑体的SiO2膜.用TEOS制得的无支撑体SiO2膜,无1.7nm以上的微孔,由硅溶胶制得的无支撑体SiO2膜平均孔径为7.5nm,且孔径分布集中,这种差异主要来自于由不同原料制备的溶胶,其聚合物分子具有不同的形态和生长模式.用TEOS作原料,在无过渡层的α-Al2O3多孔支撑体上制得了无大孔缺陷、厚约15μm的SiO2膜,膜对BSA的百分截留率为75.8%.在有过渡层的α-Al2O3上制得的SiO2膜的纯N2渗透表现为Knudsen扩散特征.起超滤和扩散作用的是SiO2膜层内部的缺陷微孔.

Inorganic/organic nano composite materials exhibit enhanced performance due to the nano size effect of the inorganic phase dispersed in the organic matrix.The conventional way to prepare nano composite materials is to mix nano dimensional inorganic particles into a polymer matrix.The inorganic particles,however,are usually non homogeneously dispersed because on energy considerations the aggregation of the inorganic particles is favored. In addition,the distinct difference in surface characters between the...

Inorganic/organic nano composite materials exhibit enhanced performance due to the nano size effect of the inorganic phase dispersed in the organic matrix.The conventional way to prepare nano composite materials is to mix nano dimensional inorganic particles into a polymer matrix.The inorganic particles,however,are usually non homogeneously dispersed because on energy considerations the aggregation of the inorganic particles is favored. In addition,the distinct difference in surface characters between the discontinuous inorganic phase and continuous organic matrix has an adverse effect on the dispersion of the former.The design of a novel inorganic organic nano composite structure is thus put forward in this work.By taking advantage of the nano sized pore diameter and wall thickness,MCM 48 is proposed as the inorganic component of the novel inorganic organic nano composite structure,and the nano composite structure is proposed to be formed through in situ self assembly of inorganic silica precursors and organic template.The effects of the conditions including the concentration of alkali solution,pre hydrolysis step,organic/inorganic molar ratio,pre\|assembly time and pre assembly temperature on the self assembly have been investigated.The proposed nano composite structure can be formed with CTABr as the organic template and TEOS as the inorganic precursors.The novel aspect of this nano composite structure is that the organic phase in the nano sized pores is isolated by the inorganic phase.The organic template extends along the channels to the openings and is beneficial to the dispersivity of nano composite particles in both polar and non polar medium such as water and toluene.The content of the organic template can be varied to optimise the properties of the nano composites.The inorganic organic nano composite particles are expected to be favorable to the interaction bteween the nano composite structure and a bulk polymer matrix.

提出了以具有纳米尺寸孔径及孔壁厚度的MCM 48作为无机基体、以无机 有机原位自组装的方法形成纳米网络粒子 .研究结果表明 ,在一定实验条件下 ,有机相可进入无机相的三维孔道自组装形成立方有序结构的纳米网络复合粒子 .通过研究纳米网络粒子在极性介质和非极性介质中的分散发现 ,有机相的存在有利于纳米网络粒子的分散

MoO 3/SiO 2 catalyst was prepared by sol gel method at low temperature, in which ammonium heptamolybdate and tetraethoxysilane (TEOS) were used as molybdenum and silica precursor, respectively. The catalyst samples were characterized by N 2 adsorption, XRD and FT IR. The results show that the MoO 3/SiO 2 has higher surface area ( e.g. A =363 8 m 2/g for 10%MoO 3/SiO 2) and MoO 3 is highly dispersed on SiO 2. Different acidic hydrolysts (HCl, HNO 3 and HAc) used in the preparation of catalyst...

MoO 3/SiO 2 catalyst was prepared by sol gel method at low temperature, in which ammonium heptamolybdate and tetraethoxysilane (TEOS) were used as molybdenum and silica precursor, respectively. The catalyst samples were characterized by N 2 adsorption, XRD and FT IR. The results show that the MoO 3/SiO 2 has higher surface area ( e.g. A =363 8 m 2/g for 10%MoO 3/SiO 2) and MoO 3 is highly dispersed on SiO 2. Different acidic hydrolysts (HCl, HNO 3 and HAc) used in the preparation of catalyst can affect obviously the surface area of MoO 3/SiO 2 catalyst and the dispersion of MoO 3 on SiO 2. MoO 3/SiO 2 catalyst, prepared using HCl as acidic hydrolyst, exhibits higher surface area and more uniform dispersion of MoO 3 on support than that prepared using other hydrolysts. The catalytic performance of MoO 3/SiO 2 for the epoxidation of propylene to propylene oxide by 30% cumene hydroperoxide was examined and the effects of reaction conditions (such as temperature, time, pressure, solvent and basic depressor) were studied in detail. The results show that the tert butanol is an available solvent and the epoxidation of propylene can be promoted by adding basic depressor into the solvent. When NaHCO 3 ( ρ =2 5 g/L ) was used as basic depressor, the selectivity for propylene oxide could increase. 15%MoO 3/SiO 2 catalyst, prepared using HCl as acidic hydrolyst, showed higher activity and selectivity for propylene oxide, for instance, using tert butanol as solvent and at 110 ℃ and 0 6 MPa for 2 h, the conversion of cumene hydroperoxide is 89% and the selectivity for propylene oxide is 80%.

以sol gel法制备了MoO3 /SiO2 催化剂 ,并用BET比表面积测定 ,XRD和FT IR等手段对催化剂进行了表征 ;研究了以过氧化氢异丙苯为氧化剂的丙烯一步环氧化反应 ,考察了催化剂的制备条件和反应条件对丙烯环氧化反应的影响 .结果表明 ,在制备过程中 ,酸性水解剂对MoO3 /SiO2 催化剂的分散度、比表面积和催化性能有较大的影响 .用HCl溶液作为水解剂制备的催化剂 ,其性能明显优于用HNO3 或HAc作水解剂制备的催化剂 .在 110℃和 0 6MPa的条件下反应 2h ,过氧化氢异丙苯转化率为 89% ,环氧丙烷选择性为 80 % .

 
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