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- surfactant
相关语句
  相似匹配句对
     Bolaform Surfactant
     Bola型表面活性剂
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     The Surfactant Market
     世界表面活性剂市场(英)
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     Application of Bio-surfactant
     生物基表面活性剂的应用
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     Association of B-Cyclodextrin with Cationic Surfactant
     β-环糊精与阳离子表面活性剂的包结作用
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  - surfactant
Sizes and Conformation of the Molecules of DNA-Surfactant Complexes in Dilute Solutions and on the Atomic Smooth Substrates
      
The DNA-surfactant complexes were deposited onto the substrates from a chloroform solution.
      
The number of particles of the DNA-surfactant complex on the substrate was changed by varying the concentration of the initial solution within three orders of magnitude.
      
The particles of a shape close to ellipsoidal, 25-70 nm in diameter and 2-4 nm high, were observed at the lowest concentration of DNA-surfactant solution on the mica substrate.
      
The shape and size of these particles correspond to those of a single DNA-surfactant complex, calculated from its translational diffusion coefficient and the time of orientational relaxation in dilute solutions.
      
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Although the surface adsorption of ionic surfactants had been widely studied, the investigations were almost limited to solutions containing only a single surfactant. In the present investigation surface tension of the mixed solutions containing a cationic and an anionic surfactant namely, dodecylpyridinium bromide and sodium dodecylsulfate, has been measured by the drop-volume method, and the individual adsorption of each surface-active ion calculated by the following equations:

本工作研究澳化十二烷基呲啶(C_(12)NBr)和硫酸十二烷基钠(NaC_(12)S)两种正、负离子表面活性剂的混合溶液(加入溴化钠作成等离子强度溶液)的表面吸附。用滴体积法测定C_(12)NBr水溶液、等离子强度的、不同C_(12)Br-NaC_(12)S比例的水溶液及1:1当量C_(12)NBr-NaC_(12)S混合溶液的表面张力。利用等离子强度条件下的Gibbs吸附公式 -((dγ/dln m_N))_m_S=RTГ′_N及- -((dγ/dln m_N))_m_N=RTГ′_S,可分剧求出正、负表面活性离子的吸附量。结果表明: 1.负离子表面活性剂之存在大为增加正离子表面活性剂的表面活性;反之亦然。1:1当量C_(12)NBr-NaC_(12)S混合溶液的CMC约为2×10~(-5)m,比C_(12)NBr溶液的CMC约小650倍。 2.负离子表面活性剂之存在促进正表面活性离子的表面吸附;反之亦然。这恰好与负、负表面活性离子混合溶液及丁醇-负表面活性离子混合溶液之情形相反。 3.加无机盐(NaBr)对1:1当量C_(12)NBr-NaC_(12)S混合溶液的表面张力几无影响,亦即对吸附无显著影响。由...

本工作研究澳化十二烷基呲啶(C_(12)NBr)和硫酸十二烷基钠(NaC_(12)S)两种正、负离子表面活性剂的混合溶液(加入溴化钠作成等离子强度溶液)的表面吸附。用滴体积法测定C_(12)NBr水溶液、等离子强度的、不同C_(12)Br-NaC_(12)S比例的水溶液及1:1当量C_(12)NBr-NaC_(12)S混合溶液的表面张力。利用等离子强度条件下的Gibbs吸附公式 -((dγ/dln m_N))_m_S=RTГ′_N及- -((dγ/dln m_N))_m_N=RTГ′_S,可分剧求出正、负表面活性离子的吸附量。结果表明: 1.负离子表面活性剂之存在大为增加正离子表面活性剂的表面活性;反之亦然。1:1当量C_(12)NBr-NaC_(12)S混合溶液的CMC约为2×10~(-5)m,比C_(12)NBr溶液的CMC约小650倍。 2.负离子表面活性剂之存在促进正表面活性离子的表面吸附;反之亦然。这恰好与负、负表面活性离子混合溶液及丁醇-负表面活性离子混合溶液之情形相反。 3.加无机盐(NaBr)对1:1当量C_(12)NBr-NaC_(12)S混合溶液的表面张力几无影响,亦即对吸附无显著影响。由此提出,对于无盐时的1:1C_(12)NBr-NaC_(12)S混合溶液,Gibbs吸附公式应为 -dγ/RT=(Г′_N+Г′_S)dlnm_N(或s) 4.1:1 当量混合溶液表面吸附的最小分子面积为16(?)~2(加NaBr)及15(?)~2(未加 NaBr)。因此可能有多分子吸附层的形成。此外,自实验结果的解析提出1:1当量混合溶液的表面无双电层;而正、负表面活性剂的高表面活性及高吸附量的产生,是由于长链间的van der Waals引力及正、负离子的静电引力的作用。

This paper deals with a new method of preparing rosin chloride directly with chlorine, which is different from the traditional method as shown in relevant materials. The chlorinated rosin soap lye thus made can be used as surfactant and lubricant in place of chlorinated paraffinum, as it is characterized by its properties of better condensation and antifrication.

本文介绍用与文献不同的方法,直接用氯气制备氯化松香,原料易得,设备简单,没有污染。并首创将氯化松香皂用于表面活性剂与极压添加剂,比氯化石蜡有更好的抗磨性和冷却作用。

A simple photo-galvano-voltaic cell has been constructed by using a Nesa glass coated with SnO2 on both sides as transparent electrodes, one of which is further coated with a photosensitizing dyestuff, meso-tetraphenylporphrin (TPP), forming the photo-cathode, and using an aqueous solution of thionine and Fe+++/Fe++redox couple as the electrolytic solution. By adding a surfactant, Na Lauryl sulfate, into the solution the. surface resistance of the TPP film is greatly lowered, so that the photocurrent of...

A simple photo-galvano-voltaic cell has been constructed by using a Nesa glass coated with SnO2 on both sides as transparent electrodes, one of which is further coated with a photosensitizing dyestuff, meso-tetraphenylporphrin (TPP), forming the photo-cathode, and using an aqueous solution of thionine and Fe+++/Fe++redox couple as the electrolytic solution. By adding a surfactant, Na Lauryl sulfate, into the solution the. surface resistance of the TPP film is greatly lowered, so that the photocurrent of the cell, is markedly enhanced, and the light conversion efficiency is increased more than twofold. It has been demonstrated that a multilayer liquid film photo-galvano-voltaic cell with film thickness less than 100μ cangreatly increase the light conversion efficiency, and the open-circuit voltage of more than two volts can be easily achieved. Several properties especially the semiconducting characters of the TPP coating material have been shown by analyzing the action spectrum, the Ⅰ-Ⅴ characteristic curve, and the photores-ponse light intensity dependency of this photo-galvano-voltaic cell.

用四苯基卟吩在导电玻璃上的涂层为光电极,构成光生伏打-光原电池(PGV电池) 添加十二烷基硫酸钠能显著提高光电流,使光能转换效率倍增。构成多层液膜PGV电池,开路光电势易于超过2伏。本文讨论了上述电池的若干性质。

 
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