共查询到19条相似文献，搜索用时 484 毫秒
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数种表面活性剂对鲁米诺-H_2O_2-Fe~(3+),光泽精H:O。AllO和2,9一二甲基一1,IG菲咯琳一H:O。-Cu’”三种化学发光反应的影响情况进行了试验研究,对表面活性剂在化学发光反应中的作用及机理进行了初步讨论. 相似文献
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本文简要介绍了表面活性剂的结构、种类、性质,并对三次采油用表面活性剂的研究进展进行详细介绍,表明表面活性剂已在三次采油中得到了广泛的应用并明确了三次采油用表面活性剂的发展方向。 相似文献
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表面活性剂是具有表面活性,能够显著降低表面张力的一类物质,又被誉为"工业味精",表面活性剂具有润湿、乳化、増溶、渗透、发泡、去污等作用性能。本文着重介绍了表面活性剂在家用洗涤剂中所发挥的重要作用,表面活性剂的分类,对表面活性剂不同性能在洗涤剂中的具体应用作了一定的分析,目的是希望大家对表面活性剂在洗涤剂中的应用有更深层次的认识。 相似文献
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本文简单论述了表面活性剂和生物降解的定义,概述了表面活性剂生物降解的指标,对常见的几种表面活性剂生物降解的方法进行了扼要的论述,同时确定了未来的研究方向,希望能够对表面活性剂生物降解的研究有所帮助。 相似文献
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李良红;徐彬彬;李绍文 《内江科技》2013,(10):94-95
<正>本文综述了含氟表面活性剂的分子结构、分类、合成方法及独特的性质,即高表面活性、低使用浓度、高化学稳定性、高热稳定性、优良的僧水僧油性、优良的复配性能、低毒性和其它的优良性能,并认为这类新型表面活性剂在三次采油中有极大的潜在应用前景。普通表面活性剂的碳氢链中的氢原子部分或全部被氟原子取代后,具有碳氟链憎水基的表面活性剂被称为氟表面活性剂,它是特种表面活 相似文献
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在三次采油提高原油采收率的过程中,向油层注入表面活性剂,是当今提高原油采收率的重要方法。但单独使用非离子或阴离子表面活性剂都具有一定局限性。复配后的混合体系具有两种表面活性剂的优点,又可产生超低界面张力。本文分析了表面活性剂驱油机理,结合阴离子表面活性剂与非离子表面活性剂的性能特点,通过现场实验和理论分析得出了复配所产生的优良性质对驱油的作用,可以在驱油过程中产生超低界面张力。如果界面张力足够低,则滞留油就可变为流动油而开采出来,从而达到提高原油采收率的目的。 相似文献
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An emulsion system was simulated under simple shear rates to analyze its rheological
characteristics using a hierarchical multi-scale approach. The molecular dynamics (MD) simulation
was used to describe the interface of droplets in an emulsion. The equations derived from the MD
simulation relative to interfacial tension, temperature, and surfactant concentration were applied
as input parameters within lattice Boltzmann method (LBM) calculations. In the LBM simulation, we
calculated the relative viscosity of an emulsion under a simple shear rate along with changes in
temperature, shear rate, and surfactant concentration. The equations from the MD simulation showed
that the interfacial tension of the droplets tended to decrease with an increase in temperature and
surfactant concentration. The relative viscosity from the LBM simulation decreased with an increase
in temperature. The shear thinning phenomena explaining the inverse proportion between shear rate
and viscosity were observed. An increase in the surfactant concentration caused an increase in the
relative viscosity for a decane-in-water emulsion, because the increased deformation caused by the
decreased interfacial tension significantly influenced the wall shear stress. 相似文献
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In this study, we simulated deformation and surfactant distribution on the interface of a surfactant-covered droplet using optical tweezers as an external source. Two optical forces attracted a single droplet from the center to both sides. This resulted in an elliptical shape deformation. The droplet deformation was characterized as the change of the magnitudes of surface tension and optical force. In this process, a non-linear relationship among deformation, surface tension, and optical forces was observed. The change in the local surfactant concentration resulting from the application of optical forces was also analyzed and compared with the concentration of surfactants subjected to an extensional flow. Under the optical force influence, the surfactant molecules were concentrated at the droplet equator, which is totally opposite to the surfactants behavior under extensional flow, where the molecules were concentrated at the poles. Lastly, the quasi-equilibrium surfactant distribution was obtained by combining the effects of the optical forces with the extensional flow. All simulations were executed by the lattice Boltzmann method which is a powerful tool for solving micro-scale problems. 相似文献
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实验研究表明 ,表面活性剂胶束溶液可加快水合物的形成和提高水合物的储气质量。在水合物形成体系实验中 ,添加了阴离子表面活性剂 (十二烷基硫酸钠 ) .结果发现 ,合成天然气 (甲烷、乙烷和丙烷的摩尔分数分别为 92 .0 5 %、4.96%和 2 .99% )在无搅拌 (即静止 )的系统中可快速形成 ,而且极大地提高了水合物的储气能力。对水合物储气而言 ,十二烷基硫酸钠溶液的浓度存在一个最佳值 ,使水合物的储气量达到最大值 相似文献
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The applicability of droplet-based microfluidic systems to many research fields stems from the fact that droplets are generally considered individual and self-contained reaction vessels. This study demonstrates that, more often than not, the integrity of droplets is not complete, and depends on a range of factors including surfactant type and concentration, the micro-channel surface, droplet storage conditions, and the flow rates used to form and process droplets. Herein, a model microfluidic device is used for droplet generation and storage to allow the comparative study of forty-four different oil/surfactant conditions. Assessment of droplet stability under these conditions suggests a diversity of different droplet failure modes. These failure modes have been classified into families depending on the underlying effect, with both numerical and qualitative models being used to describe the causative effect and to provide practical solutions for droplet failure amelioration in microfluidic systems. 相似文献
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Foams have many useful applications that arise from the structure and size distribution of the bubbles within them. Microfluidics allows for the rapid formation of uniform bubbles, where bubble size and volume fraction are functions of the input gas pressure, liquid flow rate, and device geometry. After formation, the microchannel confines the bubbles and determines the resulting foam structure. Bubbly structures can vary from a single row ("dripping"), to multiple rows ("alternating"), to densely packed bubbles ("bamboo" and dry foams). We show that each configuration arises in a distinct region of the operating space defined by bubble volume and volume fraction. We describe the boundaries between these regions using geometric arguments and show that the boundaries are functions of the channel aspect ratio. We compare these geometric arguments with foam structures observed in experiments using flow-focusing, T-junction, and co-flow designs to generate stable nitrogen bubbles in aqueous surfactant solution and stable droplets in oil containing dissolved surfactant. The outcome of this work is a set of design parameters that can be used to achieve desired foam structures as a function of device geometry and experimental control parameters. 相似文献
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