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oh缺陷
相关语句
  oh-defect
     The formation of OH - defect in BaTiO 3 crystallite has been studied.
     本文研究了水热条件下制备的BaTiO3晶粒中OH-缺陷的形成。
短句来源
     It has been found that OH - defect concentration decrease and content of tetragonal BaTiO 3 in product increase with increasing of Ba /Ti molar ratio in solution. The structure similarity between BaTiO 3 and anatase has been discussed on the crystal chemistry viewpoint.
     实验表明,随着溶液中的钡钛摩尔比增大,产物中的OH-缺陷减少,四方相BaTiO3的含量增多。
短句来源
  “oh-缺陷”译为未确定词的双语例句
     The crystallization orientation of TiO 6 octahedra in these two crystals are both point to the crystal axis a,b and c . Thus the growth units of anatase can epitaxially grow on BaTiO 3 crystallites. The defects are formed when the structure mismatch ocurred,the defects are the free end of TiO 6 octahedron,i.
     从结晶化学的角度剖析了BaTiO3与锐钛矿结构的相似性,两种晶粒中的Ti—O6八面体的结晶方位一致,其顶角分别指向晶轴a,b和c,因此锐钛矿的生长基元可以往BaTiO3晶粒上配向生长,在结构失配处即可形成缺陷,在缺陷部分TiO6八面体自由端处保留了OH-结构,这是形成晶粒中OH-缺陷的主要原因。
短句来源
  相似匹配句对
     The activity of OH-.
     OH.
短句来源
     OH,O_2~-.
     OH、(?)
短句来源
     Defects of Corrugated Box
     纸箱的缺陷
短句来源
     Formation of OH - Defect in BaTiO 3 Crystallite under Hydrothermal Conditions
     水热条件下BaTiO_3晶粒中OH~缺陷的形成
短句来源
     THE OH ABSORPTION SPECTRUM As A PROBE FOR DEFECT STRUCTURE OF LiNbO_3 CRYSTAL
     OH~-吸收带作为铌酸锂晶体缺陷结构的探针
短句来源
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The pervaporation properties of silicone rubber membranes filled wit.h ZSM-5and silicalite-1 for organic solvent/water system are relative to the compostion, structure, and desorption behavior of the membranes. The key factors are the structural properties of filled zeolite, including silica-alumina ratio, canon, St - OH defect and crystallinity. The silicalite-1 with perfect framework shows excellent hydrophobicity,high selectivity for adsorbing organic solvents, and low desorption temperature. The pervaporation...

The pervaporation properties of silicone rubber membranes filled wit.h ZSM-5and silicalite-1 for organic solvent/water system are relative to the compostion, structure, and desorption behavior of the membranes. The key factors are the structural properties of filled zeolite, including silica-alumina ratio, canon, St - OH defect and crystallinity. The silicalite-1 with perfect framework shows excellent hydrophobicity,high selectivity for adsorbing organic solvents, and low desorption temperature. The pervaporation selectivity (a) for 4. 3 % EtOH solution through the filled membrane prepared there of can reach 30. The performance of separation of raw material silicone rubber also has some relation with the property of filled membrane. As difference in molecule dimension and polarity, the permeation effects for 1-propanol/water, isopropanol/water and acetone/water systems are different evidently. The influence of filling zeolite on the mechanical properties of the membrane are also studied in this article.

用ZSM-5沸石或硅沸石(silicalite-1)填充硅橡胶制成了疏水性分离膜,它对有机溶剂/水系统的渗透蒸发性能与膜的组成、结构以及吸附、脱附行为有关.所填充的沸石结构性质(如硅铝比、阳离子、Si-OH缺陷以及结晶度等)是影响膜分离性能的关键因素.用结构完美、疏水性优良的硅沸石制备的填充膜其乙醇/水的分离系数α可达30.基材硅橡胶本底的分离性质也影响填充膜的性能.填充膜对正丙醇/水、异丙醇/水、丙酮/水系统的分离效果不同与这些有机分子的分子尺寸及极性有关.本文还研究了填充膜的机械性能随填充量改变的规律.

The thermal desorption behaviour of hydrocarbons, alcohols and alkyl - amines from zeolite silicalite - 1, which possesses perfect framework without cations and Si-OH defect, was studied by TG/DTG/DTA. The temperatures o,f desorption of these organics from silicalite - 1 arelower than 300℃. AT a new concept on affinity of silicalite framework to the guest molecule has been defined as difference between Td and Tb, where Td is the temperature of weight loss peak at DTG curve and Tb the boiling temperature at standard...

The thermal desorption behaviour of hydrocarbons, alcohols and alkyl - amines from zeolite silicalite - 1, which possesses perfect framework without cations and Si-OH defect, was studied by TG/DTG/DTA. The temperatures o,f desorption of these organics from silicalite - 1 arelower than 300℃. AT a new concept on affinity of silicalite framework to the guest molecule has been defined as difference between Td and Tb, where Td is the temperature of weight loss peak at DTG curve and Tb the boiling temperature at standard pressure. The AT values for saturated hydrocarbons are 60~90, while 6~ 13 for benzene, toluene, ethyl - benzene and p - xylene. The AT value evidently decreases for alkyl - alcohol since stronger electronegativety of its hydroxy group. The AT values are negative for alcohols with muti - hydroxy groups. For methylamine and ethylamine, the AX values are 160 and 127 respectively, much higher than that for other alkylamines.The endothermal effect of desorption from silicalite- 1 in DTA curve ous for p - xylene, alkyl - alcohols and alkylamines. The difference in AT value as well as thermal effect of desorption is from the different interaction between the framework micropore surface constructed by O2- and C-H groups and other polar groups of organics, and from the different situation of associate for the molecules adsorbed, which is limited by the void space in framework of silicalite - 1. These facts reflect a different type of supermolecular interaction for host/guest system.

用TG/DTG/DTA法研究无阳离子与Si—OH缺陷、结构完美的硅沸石上烃类、烷基醇、烷基胺的热脱附行为.有机分子从硅沸石上脱附的温度低于300℃其亲和性值A_T=T_d-T_b,式中T_d为有机分子在DTG上的失重峰温,T_b为该有机物在标准压力下的沸点.饱和烷烃的A_T值为60~90,而苯、甲苯、对二甲苯等的A_T值为6~13.电负性较强的羟基使烷基醇与硅沸石的亲和性明显下降.多羟基醇的A_T值为负值.对二甲苯、烷基醇、烷基胺在脱附时有明显吸热效应.A_T值及脱附热效应的不同是硅沸石骨架0~(2-)微孔表面与有机分子C—H基因,其它极性基因之间相互作用不同,以及受到硅沸石骨架空间限制的被吸附分子间缔合情况不同所致,反应了不同类型的主体/客体超分子相互作用.

Pure phase FER zeolite and siliceous FER zeolite have been synthesized in the systems of tetramethyl ethylene diamine - Na2O - SiO2 - Al2O3 - H2O( I ), Na2O - K2O - Al2O3 - SiO2 - H2O -HCO3- - CO32- ( II), and pyridine - propylamine - HF - SiO2 -H2O ( III ) respectively. All the samples prepared were characterized by chemical composition, SEM, XRD, FT- IR,29Si and 27A1 MAS NMR, and TG/DTA methods. Adsorption isotherms of hexane, methanol and water on these samples were measured using super micro - adsorption...

Pure phase FER zeolite and siliceous FER zeolite have been synthesized in the systems of tetramethyl ethylene diamine - Na2O - SiO2 - Al2O3 - H2O( I ), Na2O - K2O - Al2O3 - SiO2 - H2O -HCO3- - CO32- ( II), and pyridine - propylamine - HF - SiO2 -H2O ( III ) respectively. All the samples prepared were characterized by chemical composition, SEM, XRD, FT- IR,29Si and 27A1 MAS NMR, and TG/DTA methods. Adsorption isotherms of hexane, methanol and water on these samples were measured using super micro - adsorption - electron balance in vacuum. It is found that all the samples are of high - crystallinity, whereas their thermal stability and adsorption property are remarkably varied because of the differences in composition and micro - defects in the structure of these zeolites. Zeolite FER synthesized in system ( I ) has less stacking faults and perfect framework. Its adsorption capacities of hexane and methanol are in good agreement with calculated values. The temperature of the zeolite structure damage is at 1190 t. Siliceous FER zeolite possesses perfect framework as revealed by FT - IR and high resolution Si MAS NMR spectra. Its adsorption capacities of hexane and methanol were slightly lower than calculated values because of the unit cell contraction. It has high hydrophobicproperty. The temperature of the zeolite framework collapse is higher than 1300℃ . More stacking faults are found in FER zeolite obtained from system (II ). Potassium cations in the channels are difficult to be ion exchanged with protons. Its adsorption capacities of hexane and methanol are obviously low, whereasthe capacity of water is relatively high. The temperature of the zeolite structure damage is at 1169℃ . According to the sorption isotherms, hexane and methanol are adsorbed in the ten - membered ring channel. Methanol molecules can enter the small cage through the eight - membered ring window at high partial pressure. The adsorption of water correlates to Si-OH defect and concentration of cations in the zeolites.

在TMEDA(四甲基乙基二胺)-Na_2O-SiO_2-Al_2O_3-H_2O体系(Ⅰ),Na_2O-K_2O-Al_2O_3-SiO_2-H_2-HCO_3~-CO_3~(2-) (Ⅱ)及Py(吡啶)-PrNH_2(正丙胺)-HF-SiO_2-H_2O体系(Ⅲ)中,分别合成了纯相FER沸石及FER硅沸石.用粉末XRD,FT-IR,~(29)Si MAS NMR及TG/DTA等表征其结构性质,并用超微量电子真空吸附天平测定这些沸石样品对正己烷,甲醇和水的吸附等温线.结果表明:各体系合成的样品虽然结晶度高,呈现出FER沸石的典型结构特征,但由于它们的组成和晶格微结构不同,热稳定性与吸附性质有明显的差异.在(Ⅰ)体系中合成的FER沸石层错缺陷少,晶格完美,正己烷与甲醇的吸附量可达到理论值,结构破坏温度为1190℃.红外精细谱及~(29)Si MAS NMR高分辨谱证明FER硅沸石具有十分完美的骨架结构.由于晶胞收缩,它对正己烷与甲醇吸附量略低于理论值,并呈现出高度的疏水性.它的结构破坏温度高于1300℃.在(Ⅱ)体系中合成的FER型沸石结构缺陷多,沸石孔中的钾离子不易被质子完全交换.它的正己烷与甲醇吸附量均较低...

在TMEDA(四甲基乙基二胺)-Na_2O-SiO_2-Al_2O_3-H_2O体系(Ⅰ),Na_2O-K_2O-Al_2O_3-SiO_2-H_2-HCO_3~-CO_3~(2-) (Ⅱ)及Py(吡啶)-PrNH_2(正丙胺)-HF-SiO_2-H_2O体系(Ⅲ)中,分别合成了纯相FER沸石及FER硅沸石.用粉末XRD,FT-IR,~(29)Si MAS NMR及TG/DTA等表征其结构性质,并用超微量电子真空吸附天平测定这些沸石样品对正己烷,甲醇和水的吸附等温线.结果表明:各体系合成的样品虽然结晶度高,呈现出FER沸石的典型结构特征,但由于它们的组成和晶格微结构不同,热稳定性与吸附性质有明显的差异.在(Ⅰ)体系中合成的FER沸石层错缺陷少,晶格完美,正己烷与甲醇的吸附量可达到理论值,结构破坏温度为1190℃.红外精细谱及~(29)Si MAS NMR高分辨谱证明FER硅沸石具有十分完美的骨架结构.由于晶胞收缩,它对正己烷与甲醇吸附量略低于理论值,并呈现出高度的疏水性.它的结构破坏温度高于1300℃.在(Ⅱ)体系中合成的FER型沸石结构缺陷多,沸石孔中的钾离子不易被质子完全交换.它的正己烷与甲醇吸附量均较低,而水的吸附量相对较高.吸附现象表明,正己烷和甲醇都被吸附于FER沸石的十元环主孔道中,分压较高时,甲醇可通过八元环进入小笼,而水的吸附性质则主要与各样品的Si-OH缺陷及骨架中的阳离子含量有关.

 
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