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Mass Transport through Composite Asymmetric Membranes 通过复合不对称膜的质量传递
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.151
A. Mazumder, D. Sen, C. Bhattacharjee
In recent years, membrane separation technology has emerged as efficient and promising separation process from laboratory scale applications to wide range of technical industrial applications. The development of composite asymmetric membrane is a major breakthrough in membrane research field, as this membrane offers significantly high selectivity without affecting the mechanical durability of the membranes. In this chapter, structural characteristics and different fabrication techniques of composite membranes are reviewed. Moreover the mass transfer mechanism through the composite asymmetric membrane is described in details following solution-diffusion theory, Knudsen diffusion, and series resistance model. Composite membranes are preferred over others because of the high flux and enhanced selectivity without disturbing the mechanical stability of the membranes. These membranes are now widely employed in the applications of reverse osmosis (RO), nanofiltration (NF), pervaporation, gas separation, hydrocarbon fractionations, etc. As composite asymmetric membranes are “tailor-made” in nature, membrane characteristics can be tuned accordingly depending on their end use. Therefore plentiful research opportunities still exist to elevate their performance ability in terms of stability, selectivity and fouling resistance, which will in turn augment its application domain.
近年来,膜分离技术从实验室规模应用到广泛的技术工业应用,已成为一种高效而有前景的分离技术。复合非对称膜的开发是膜研究领域的重大突破,因为该膜在不影响膜的机械耐久性的情况下具有显著的高选择性。本章综述了复合膜的结构特点和不同的制备工艺。根据溶液扩散理论、Knudsen扩散理论和串联电阻模型详细描述了复合膜的传质机理。复合膜优于其他膜,因为高通量和增强的选择性,而不影响膜的机械稳定性。这些膜现在广泛应用于反渗透(RO)、纳滤(NF)、渗透蒸发、气体分离、碳氢化合物分馏等领域。由于复合非对称膜本质上是“量身定制”的,因此膜的特性可以根据其最终用途进行相应的调整。因此,在提高其稳定性、选择性和抗污垢性能方面仍有大量的研究机会,从而扩大其应用领域。
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引用次数: 0
Membrane Transport for Gas Separation 用于气体分离的膜输送
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.138
Arijit Mondal, C. Bhattacharjee
Gas separations through organic membranes have been investigated from last several years and presently it has been accepted for commercial applications. This chapter will focus on membrane based gas separation mechanism as well as its application. This chapter will cover ‘‘diffusivity controlled’’ and ‘‘solubility controlled’’ mechanism and choice of suitable polymers for different gas phase applications like acidic gas, C3+ hydrocarbon, nitrogen, water vapor and helium. Diffusivity controlled mechanism performs on free volume elements of the glassy polymers via hindrance of chain packing by functional groups and restricted by the permselectivity. Other mechanism performs on the basis of molecular structure with affinity towards the target molecule and follows enhanced solution-diffusion rout. Commercially available organic membrane materials for Carbon dioxide (CO2) removal are discussed along with process design. Membranes based separation process for heavy hydrocarbon recovery, nitrogen separation, helium separation and dehydration are less developed. This article will help us to focus on the future direction of those applications based on membrane technology. Keywords: Membrane, C3+ hydrocarbon, Diffusivity controlled, Solubility controlled, Selectivity, Permeability. *Corresponding author: E-mail address: c.bhatta@gmail.com (Chiranjib Bhattacharjee), Tel.: +91-9836402118.
近年来,人们对有机膜气体分离进行了研究,目前已被用于商业应用。本章将重点介绍膜基气体分离机理及其应用。本章将介绍“扩散控制”和“溶解度控制”的机理,以及选择适合不同气相应用的聚合物,如酸性气体、C3+碳氢化合物、氮气、水蒸气和氦气。扩散控制机制是通过官能团对链填料的阻碍作用来控制玻璃状聚合物的自由体积元,并受透性选择性的限制。另一种机制是基于对目标分子具有亲和力的分子结构,并遵循增强的溶液-扩散路线。讨论了市售的用于去除二氧化碳(CO2)的有机膜材料及其工艺设计。膜分离技术在重烃回收、氮分离、氦分离和脱水等方面还不发达。本文将对膜技术的应用前景进行展望。关键词:膜,C3+烃,扩散控制,溶解度控制,选择性,渗透性。*通讯作者:E-mail: c.bhatta@gmail.com (Chiranjib Bhattacharjee),电话:+91-9836402118。
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引用次数: 0
Ionic Transport in Sol-Gel Derived Organic-Inorganic Composites 溶胶-凝胶衍生有机-无机复合材料中的离子传输
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.104
Yuliya Dzyazko, Y. Volfkovich
This chapter is devoted to organic-inorganic composite ion exchange resins and membranes. We ascertain interrelation between composition, morphology and porous structure of the materials on the one hand and ion transport through them on the other hand. The composites for different practical application (fuel cells, ion exchange columns, electrodialysis) are in a focus of attention. Porosity of a polymer constituent of the composite was determined with a method of standard contact porosimetry, which gives information about pores in a very wide diapason (from 2 nm to 200 μm). In this context, pore formation in ion exchange polymers during swelling is considered. A number of parameters, which are obtained from porosimetric measurements, can be used for interpretation of ion transport regularities, particularly evolution of electrical conductivity. Embedded non-aggregated nanoparticles, their aggregates and agglomerates affect differently porosity of the polymer constituent: they are able to block, stretch and squeeze pores, As a result, the composites demonstrates different rate of ion transport depending on amount and size of the inorganic particles. The approach to purposeful formation of one or other types of particles has been proposed.
本章主要介绍有机-无机复合离子交换树脂和膜。我们一方面确定了材料的组成、形态和多孔结构与离子通过它们的传输之间的相互关系。不同实际应用的复合材料(燃料电池、离子交换柱、电渗析)是人们关注的焦点。采用标准接触孔隙度法测定了复合材料聚合物组分的孔隙度,该方法可以获得非常宽的间距(从2 nm到200 μm)内的孔隙信息。在这种情况下,考虑了离子交换聚合物在膨胀过程中的孔隙形成。从孔隙度测量中获得的许多参数可用于解释离子输运规律,特别是电导率的演变。嵌入的非聚集纳米粒子,其聚集和聚集对聚合物组分的孔隙度有不同的影响:它们能够阻塞、拉伸和挤压孔隙,因此,复合材料表现出不同的离子传输速率,这取决于无机颗粒的数量和大小。已经提出了有目的地形成一种或其他类型的粒子的方法。
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引用次数: 1
Graphite/UPE Nanocomposite: Transport, Thermal, Mechanical and Viscoelastic Properties 石墨/聚乙烯纳米复合材料:传输、热、机械和粘弹性性能
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.201
Shivkumari Panda, D. Behera, T. Bastia
This chapter presents the preparation and characterization of some unique properties of nanocomposites by dispersing graphite flakes in commercial unsaturated polyester (UPE) matrix. The composite was prepared by a novel method with the use of solvent swelling technique. Three different specimens of UPE/graphite nanocomposites were fabricated with addition of 1, 2 and 3 wt% of graphite flakes. Except mechanical, viscoelastic and thermo gravimetric properties, transport properties like electrical conductivity, thermal conductivity and water transport properties were studied for the first time. Graphite flakes propose enhanced properties to the composites suggesting homogeneous distribution of the nanofiller in the matrix and strong interaction with the matrix. 2wt% nanofiller loading showed superior essential characteristics and after that the properties reduced may be due to the nucleating tendency of the nanofiller particles. The XRD pattern showed the compatibility of the graphite flakes by introducing a peak around 26.550 in the nanocomposites. SEM Properties are also in agreement with the compatibility. Nanocomposite with 2wt% graphite also showed remarkable enhancement in transport, mechanical, viscoelastic and thermo gravimetric properties. So by introduction of a small quantity of graphite endow the new class of multiphase nanocomposites with inimitable structure and tremendous application.
本章介绍了将石墨片分散在工业不饱和聚酯(UPE)基体上的纳米复合材料的制备和一些独特性能的表征。采用溶剂溶胀法制备了该复合材料。分别添加1、2、3 wt%的石墨薄片制备了3种不同的UPE/石墨纳米复合材料试样。除力学、粘弹性和热重性能外,还首次研究了导电率、导热率和水输运性能。石墨薄片增强了复合材料的性能,表明纳米填料在基体中的均匀分布以及与基体的强相互作用。纳米填料填充量为2wt%时表现出较好的本质特性,超过2wt%后性能下降可能是由于纳米填料颗粒的成核倾向所致。XRD谱图表明,复合材料在26.550附近有一个峰,表明了石墨片的相容性。SEM性质也与相容性一致。石墨含量为2wt%的纳米复合材料在输运、力学、粘弹性和热重性能方面也有显著提高。因此,少量石墨的引入赋予了多相纳米复合材料以独特的结构和巨大的应用前景。
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引用次数: 0
Transport Phenomenon of Nanoparticles in Animals and Humans 纳米颗粒在动物和人体内的转运现象
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.173
M. Ansari
Nanoparticles (NPs) are microscopic objects with at least one dimension less than 100 nm. These were first discovered by Michael Faraday in 1857 when he prepared gold nanoparticles and observed that nanostructured gold produced red color. This distinct feature of nanoparticles could be due to very small size. NPs are very small compared to the wavelengths of light, hence absorb light in the blue-green portion of the spectrum (~450 nm) and reflect the red light (~700 nm) thus yield a rich red color. NPs also possess very high surface to mass ratio that could be utilized in several application areas wherein a very high surface area is required. Nanoparticles witnessed tremendous growth in research and application areas especially in medicine in twentieth century after discovery of carbon nanotubes in 1991. Nanoparticles have been explored in medicine as targeted delivery carriers to deliver macromolecules such as proteins, enzymes, to the target organ up to cellular levels. Of late, these carriers have been employed to treat several tumors owing to its capacity to deliver chemotherapeutic agents to the tumor cells only thus improving efficacy and minimizing side effects of anticancer agents.
纳米粒子(NPs)是至少一个维度小于100纳米的微观物体。1857年,迈克尔·法拉第首先发现了这些现象,当时他制备了金纳米粒子,并观察到纳米结构的金产生了红色。纳米颗粒的这种独特特征可能是由于其体积非常小。相对于光的波长,NPs非常小,因此吸收光谱中蓝绿色部分的光(~450纳米)并反射红光(~700纳米),从而产生丰富的红色。NPs还具有非常高的表面质量比,可用于需要非常高表面积的几个应用领域。自1991年碳纳米管被发现以来,纳米粒子的研究和应用在20世纪得到了极大的发展,尤其是在医学领域。纳米粒子在医学上已经被探索作为靶向递送载体,将蛋白质、酶等大分子递送到靶器官直至细胞水平。近年来,这些载体已被用于治疗几种肿瘤,因为它能够将化疗药物输送到肿瘤细胞中,从而提高了抗癌药物的疗效,并将副作用降到最低。
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引用次数: 2
Diffusion of Multiwall Carbon Nanotubes into Industrial Polymers 多壁碳纳米管在工业聚合物中的扩散
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.213
P. Kumar, A. Saravanan
Carbon nanotubes (CNTs) are made out of carbon atoms connected in hexagonal shapes, with every carbon molecule covalently attached to three other carbon particles. The properties of nanotubes have made scientists and organizations think about utilizing them in many fields. For instance, since carbon nanotubes have the most noteworthy quality to-weight proportion of any known material. Nanocomposites of adjusted multi walled carbon nanotubes (MWCNTs) installed in a polymer matrix yield a one of a kind mix of warm and electrical properties and mechanical quality. The composites combine the vast pseudo capacitance of the directing polymers with the quick charging/releasing two-fold film impedance and incredible machine-driven possessions of the carbon nanotubes. The electrochemically co-stored composites are the most homogeneous and demonstrate an unordinary communication between the polymer and nanotubes, offering ascend to a reinforced electron delocalisation and conjugation along the polymer chains
碳纳米管(CNTs)是由六边形连接的碳原子组成的,每个碳分子都以共价键连接着另外三个碳粒子。纳米管的特性使科学家和组织考虑将其应用于许多领域。例如,由于碳纳米管在所有已知材料中具有最值得注意的质量重量比。将调整后的多壁碳纳米管(MWCNTs)安装在聚合物基体中的纳米复合材料产生了一种具有热电性能和机械质量的复合材料。这种复合材料结合了定向聚合物的巨大伪电容、快速充电/释放两倍薄膜阻抗和碳纳米管令人难以置信的机器驱动财产。电化学共存储的复合材料是最均匀的,并且在聚合物和纳米管之间表现出不同寻常的通信,提供了增强的电子离域和沿着聚合物链的共轭
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引用次数: 0
Ionic Polymer Metal Composites 离子聚合物金属复合材料
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.64
P. Kumar, P. R. Yaashikaa
Electroactive polymers, or EAPs, are polymers that show an adjustment fit as a fiddle when invigorated by an electric field. Ionic polymer metal composites (IPMCs) are electro-dynamic polymers with great electromechanical coupling properties. They are proficient applicants in many progressed innovative applications, for example, actuators, artificial muscles, biomimetic sensors, and so forth. Type of membrane and electrodes determines the morphology and structure of IPMCs. IPMCs can be prepared using physical loading, chemical deposition and electroplating methods. The assembling of anodes for IPMCs is exceptionally basic in their electromechanical coupling. Optimization of force, determination of cations and molecule size dispersal inside the IPMC structure, and so on are the different components, which decides their proficiency. An ionic polymer-metal composite (IPMC) comprising of a thin Nafion sheet, platinum plated on the two side faces, experiences extensive twisting movement when an electric field is connected over its thickness. Then again, a voltage is created over its appearances when it is all of a sudden bends. IPMCs are best known for their proving advantages such as biocompactible, low activating voltage and more power efficiency
电活性聚合物(eap)是一种聚合物,当受到电场刺激时,它们会像小提琴一样调节。离子聚合物金属复合材料是一种具有良好机电耦合性能的电动力聚合物。他们是许多进步的创新应用的熟练申请者,例如,致动器,人造肌肉,仿生传感器等。膜和电极的类型决定了ipmc的形态和结构。ipmc可采用物理加载、化学沉积和电镀等方法制备。ipmc的阳极组装在其机电耦合中是非常基本的。力的优化、阳离子的确定和分子大小的分散等是IPMC内部结构的不同组成部分,这决定了它们的熟练程度。离子聚合物-金属复合材料(IPMC)由一个薄的Nafion薄片组成,两面镀铂,当电场超过其厚度连接时,会经历广泛的扭曲运动。然后,当它突然弯曲时,在它的表面上产生电压。ipmc以其生物相容性、低激活电压和更高的功率效率等优点而闻名
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引用次数: 0
Ceramic Composites for Aerospace Applications 航空航天用陶瓷复合材料
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.31
Bhasha, S. Gautam, Parul Malik, Purnima Jain
Ceramic composites is playing crucial role to accomplish highly efficiently and cost effective equipment for aerospace industry. The instigation of ceramics into aircraft industry is a promising step towards virtuous future. Ceramics has a key role in innovation of highly competent material for space travel which is highly economical and environmentally sustainable. Advancement in making fuel efficient engines are necessity in present scenario due to the harmful emissions releases in the environment by burning of fuel to power up engine. The high temperature application of composites makes it very attractive for aerospace applications. This light weight material has potential to thrust spacecraft upto ten times quicker with the identical fuel consumption, therefore significantly depreciating size of vehicle and increasing travel distance. The implementation of ceramics into jet engines and turbines increase the efficiency of engine due to its lighter weight and better thermal capabilities. A jet engine employing ceramic composites has manifest 15% more fuel saving when compared to the simple nickel based alloys. Hence, ceramic composites can replace nickel based alloys which has been a promising candidate for the engines of commercial aircrafts. Some disadvantages has been also discussed that is brittle failure and limited thermal and shock resistance.
陶瓷复合材料是实现航空航天工业中高效、低成本装备的关键。将陶瓷引入航空工业是迈向美好未来的重要一步。陶瓷在高经济和环境可持续性的太空旅行高性能材料的创新中发挥着关键作用。在当前的情况下,由于燃烧燃料向环境中释放有害排放物,因此有必要制造节能型发动机。复合材料的高温应用使其在航空航天领域的应用具有很大的吸引力。这种轻质材料有可能以相同的燃料消耗将航天器的推力提高10倍,因此大大降低了飞行器的尺寸并增加了旅行距离。将陶瓷材料应用到喷气发动机和涡轮中,由于其重量更轻,热性能更好,从而提高了发动机的效率。与简单的镍基合金相比,使用陶瓷复合材料的喷气发动机节省了15%的燃料。因此,陶瓷复合材料可以取代镍基合金,镍基合金一直是商用飞机发动机的一个有前途的候选材料。同时也讨论了它的一些缺点,即脆性破坏和有限的耐热性和抗震性。
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引用次数: 4
Solvent Transport Phenomenon of Composite 复合材料的溶剂输运现象
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.1
Rukmani Sharma, A. Sarkar
The current chapter focus on the transport phenomenon of polymeric composites . the factors like nature of polymer, temperature, fillers and nature of crosslink can affect the transport properties of a composite. Transport phenomenon in different type of polymer is also studied in the paper.
本章主要讨论聚合物复合材料的输运现象。聚合物的性质、温度、填料和交联性质等因素都会影响复合材料的输运性能。本文还研究了不同类型聚合物中的输运现象。
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引用次数: 0
Thermo Mechanical Properties of Carbon Nanotube Composites 碳纳米管复合材料的热力学性能
Pub Date : 2019-08-01 DOI: 10.4028/www.scientific.net/DF.23.90
Runcy Wilson, George Gejo, P. Prajith, M. S. Sanu, A. Chandran, N. V. Unnikrishnan
The possibility of creating polymeric nanocomposites with desired properties can be achieved by mixing it with an appropriate nanomaterial. The carbon-based nanomaterials have an excellent combination of both physical and chemical properties which create a significant interest among the researchers to prepare an industrially useful material employing carbon based nanomaterials as the filler. The thermo-mechanical properties of materials are studied to characterize their internal state and structure. In this chapter, the thermomechanical properties of polymer-CNT nanocomposites and the various factors affecting the thermomechanical properties are discussed.
通过将其与适当的纳米材料混合,可以实现具有所需性能的聚合物纳米复合材料的可能性。碳基纳米材料具有优异的物理和化学性能,这使得研究人员对利用碳基纳米材料作为填料制备工业上有用的材料产生了极大的兴趣。研究材料的热机械性能,表征材料的内部状态和结构。本章讨论了聚合物-碳纳米管复合材料的热机械性能以及影响热机械性能的各种因素。
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引用次数: 2
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Diffusion Foundations
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