聚吡咯电流变体的导电特性

以聚吡咯为悬浮颗粒相、硅油为分散介质，制备了聚吡咯电流变悬浮液，研究了其导电特性及影响因素结果表明，随着电场强度、颗粒电导率、颗粒浓度、温度的增高，悬浮体系的导电性增大；而随着剪切速率的提高，体系的导电特性降低     

壳聚糖—铜离子复合物电流变悬浮液的导电特性

以壳聚糖－铜离子复合物为悬浮颗粒相，硅油为分散介质，制得电流变悬浮液，研究了其导电特性及影响因素，如电场强度、颗粒浓度、表面活性剂含量、温度以及剪切速率等。实验结果表明，随着电场强度、颗粒浓度、温度的增大，体系的导电性增大；而随着剪切速率的提高，表面活性剂的增多，体系的导电特性降低。     

颗粒填充导电复合材料的传导特性

介绍了导电聚吡咯颗粒作为填充相,聚乙烯和聚苯乙烯作为基体相的导电复合材料的结构、导电特性、导电率的温度依赖性以及导热特性等.讨论了颗粒填充复合材料的制备工艺、结构、传导特性之间的关系.      

聚吡咯电流变体特性研究

以聚吡咯为悬浮颗粒,二甲基硅油为分散介质,制备了聚吡咯电流变体悬浮液。测试了其电流变性能,结果表明,聚吡咯电流变体具有较明显的电流变效应,并且悬浮液具有较低的漏电流密度。     

聚吡咯导复合材料结构和特性研究

介绍了低密度聚乙／聚吡咯复合材料的导电特性。发现复合材料的导电率和聚吡咯含量的关系可用“渗流理论”来描述，复合材料制备工艺强烈地影响其微观结构从影响渗流门槛植。讨论了复合材料导电率的温度依赖性行为结构的关系。     

聚吡咯导电复合材料结构和特性研究

介绍了低密度聚乙烯（聚苯乙烯）／聚吡咯复合材料的导电特性。发现复合材料的导电率和聚吡咯含量的关系可用“渗流理论”来描述，复合材料制备工艺强烈地影响其微观结构从而影响渗流门槛值。讨论了复合材料导电率的温度依赖性行为和结构的关系。     

聚吡咯及其共聚物的研究进展

作为典型的导电高分子材料,聚吡咯具有良好的光、电、磁特性,其应用已经涉及生物传感器、电致变色、防腐等领域,但聚吡咯天然的难溶熔性和难加工性一直制约着它的规模化应用。制备具有良好力学性能和溶解性的导电聚吡咯已经成为该领域的重要研究内容。制备吡咯共聚物是改善和提高其性能的主要方法之一。文中介绍了聚吡咯及其共聚物近年来的研究...     

炭黑吸附聚合制备聚吡咯/ 炭黑导电复合材料

用炭黑吸附化学氧化聚合法制备聚吡咯/ 炭黑( PPy/ C) 导电复合材料。运用FT2IR、TGA、SEM、四探针和电化学测试仪对材料的组成、结构和性能进行了测试和表征。导电炭黑的加入不仅提高了材料的电导率,由原来的6.152 S/ cm 增加至13.42 S/ cm, 而且提高了材料的堆积密度, 改善了聚吡咯的颗粒形态和制膜加工性能, 聚吡咯复合材料为正极的锂/ 聚吡咯二次电池的性能得以改善, 室温下充放电循环30 次以上, 电池容量无明显衰减, 库仑效率在98 %以上, 首次放电容量以聚吡咯计可达41 mAh/ g。      

聚吡咯/银/聚多巴胺抗菌导电蚕丝织物的制备及性能研究

为制备具有抗菌和导电性能的柔性电子器件，将多巴胺在碱性有氧条件下聚合在蚕丝织物表面，以硝酸银和吡咯为原料，通过氧化还原反应生成银和聚吡咯，得到具有高效抗菌活性和导电性的聚吡咯/银/聚多巴胺蚕丝织物。采用红外光谱、扫描电镜和X射线衍射对聚吡咯/银/聚多巴胺蚕丝织物表面形貌和结构进行分析。测试其表面热稳定性能和疏水性能。此外，通过抑菌圈的方法测试其表面抗菌性能，发现聚吡咯/银/聚多巴胺蚕丝织物可快速杀死金黄色葡萄球菌和大肠杆菌。最后，利用四探针测试仪，探究了不同吡咯和硝酸银浓度对复合织物导电性能的影响。该蚕丝织物有望应用于柔性可穿戴电子器件和传感器等领域。     

聚吡咯电极材料在超级电容器中的研究进展

聚吡咯是导电稳定性最好的导电聚合物之一。因其制备方式简单、环境友好、导电率高、电容性好及独特的掺杂性,制备聚吡咯复合材料以提高电极材料的稳定性成为超级电容器导电聚合物基电极材料的热点研究方向。综述了近年来聚吡咯电极材料及其与碳基材料、金属氧化物材料等二元、三元复合电极材料应用于超级电容器中的研究进展,介绍了聚吡咯的电荷储存机制、聚合机理、制备方法等,指出了当前超级电容器聚吡咯及其复合电极材料的热点研究领域,并且展望了其发展前景。     

氧化铝悬浮液剪切流变特性的研究

分析了柠檬酸铵(TAC,分散剂)稳定的氧化铝悬浮液的剪切流变行为,研究了TAC加入比例及颗粒大小对流变特性的影响.认为静态时悬浮液中存在由于颗粒布朗运动而形成的热力学颗粒簇,剪切变稀是在剪切作用下热力学颗粒簇分解的结果,而剪切稠化源于剪切作用下水力学颗粒簇的形成.通过悬浮液中颗粒成簇势垒概念的引入,提出悬浮液的低剪粘度和高剪粘度分别取决于氧化铝颗粒表面的ζ电位和Stern电位,通过加入过量的柠檬酸铵可以抑制悬浮液的剪切稠化,推导出了剪切稠化临界剪切速率与颗粒粒径关系的数学表达式.     

Measurement of particle-size distribution and volume fraction in concentrated suspensions with photon migration techniques

The determination of the particle size distribution and the volume fraction in concentrated suspensions from the multiwavelength measurement of isotropic-scattering coefficients by use of frequency-domain photon migration techniques is demonstrated for three different polydisperse polystyrene suspensions. When a Newton-type inverse algorithm is used, the successful recovery of the particle size distribution, in the form of a Weibull function, and the volume fraction of polystyrene suspensions is achieved. Our results are in excellent agreement with dynamic light-scattering size distribution measurements. On consideration of the particle mass conservation as an additional constraint penalty term in the inverse algorithm, it is shown that the quality of the particle size distribution reconstruction can be improved. Because no calibration is needed, photon migration techniques are especially suited for on-line measurement of the particle size distribution and the volume fraction in the chemical- and the pharmaceutical-based industries.     

高固含量Y-TZP悬浮液的流变学特性

采用聚丙烯酸盐（ Ｎａ Ｐ Ａ Ａ、 Ｎ Ｈ_４ Ｐ Ａ Ａ） 作为分散剂, 制备了高固相含量（ ～５０ｖｏｌ％ ） 的 Ｙ Ｔ Ｚ Ｐ悬浮液研究了分散剂、粉体粒径和固含量对 Ｙ Ｔ Ｚ Ｐ 悬浮液流变学性能的影响结果表明： 分散剂的含量为１.８ｗｔ％ 时对悬浮液有最好的分散效果悬浮液的粘度随粒径的增加而降低, 高固含量浆料的流动曲线符合 Ｂｉｎｇｈａｍ 模型同时对分散剂的吸附分散机理进行了分析和讨论     

聚丙烯酸对水基磁流变液稳定性的改良

以羰基铁粉为悬浮介质、水为分散介质的悬浮液中加入聚丙烯酸(PAA),分别测量不同条件下悬浮液的电泳淌度及吸光度随时间的变化.结果表明,磁性颗粒对聚丙烯酸分子的吸附,增加了其表面电势,颗粒之间的静电斥力阻碍了团聚的发生,提高了体系的抗团聚、抗沉降稳定性.同时也研究了pH值及PAA浓度对悬浮液稳定性的影响.     

Irreversible adsorption of gold nanospheres on fiber optical tapers and microspheres

We study the adsorption of gold nanospheres onto cylindrical and spherical glass surfaces from quiescent particle suspensions. The surfaces consist of tapers and microspheres fabricated from optical fibers and were coated with a polycation, enabling irreversible nanosphere adsorption. Our results fit well with theory, which predicts that particle adsorption rates depend strongly on surface geometry and can exceed the planar surface deposition rate by over two orders of magnitude when particle diffusion length is large compared to surface curvature. This is particularly important for plasmonic sensors and other devices fabricated by depositing nanoparticles from suspensions onto surfaces with non-trivial geometries.     

Emergence of coherent structures and large-scale flows in motile suspensions

The emergence of coherent structures, large-scale flows and correlated dynamics in suspensions of motile particles such as swimming micro-organisms or artificial microswimmers is studied using direct particle simulations. A detailed model is proposed for a slender rod-like particle that propels itself in a viscous fluid by exerting a prescribed tangential stress on its surface, and a method is devised for the efficient calculation of hydrodynamic interactions in large-scale suspensions of such particles using slender-body theory and a smooth particle-mesh Ewald algorithm. Simulations are performed with periodic boundary conditions for various system sizes and suspension volume fractions, and demonstrate a transition to large-scale correlated motions in suspensions of rear-actuated swimmers, or Pushers, above a critical volume fraction or system size. This transition, which is not observed in suspensions of head-actuated swimmers, or Pullers, is seen most clearly in particle velocity and passive tracer statistics. These observations are consistent with predictions from our previous mean-field kinetic theory, one of which states that instabilities will arise in uniform isotropic suspensions of Pushers when the product of the linear system size with the suspension volume fraction exceeds a given threshold. We also find that the collective dynamics of Pushers result in giant number fluctuations, local alignment of swimmers and strongly mixing flows. Suspensions of Pullers, which evince no large-scale dynamics, nonetheless display interesting deviations from the random isotropic state.     

Radial patterns and velocity field of non-Brownian suspensions in a fully filled horizontal rotating cylinder

This work reports radial patterns and velocity profiles of fluid-particle suspensions rotating in a fully filled horizontal cylinder using the technique of Particle Image Velocimetry. Dilute and mono-dispersed suspensions of non-Brownian settling as well as floating particles were considered. An analysis of the effect of particle shape on the flow patterns is provided. This was carried out by comparing the suspensions of spherical and cylindrical particles. Impact of particle shape on the particle-fluid interaction in determining the flow structure is more pronounced at lower speeds. Analysis of the velocity profiles showed a resemblance of the buoyant and settling suspensions phases. Despite the similar features observed, a difference was noted when the centrifugal forces dominate. Our experimental results are in good qualitative agreement with the previous experiments and simulations. Through a detailed investigation of velocity field we have established the strong relationship between the phase transition and rotational speed.     

Temperature‐Sensitive Hydrogel‐Particle Films from Evaporating Drops

A simple method to prepare temperature‐sensitive films composed of micrometer‐sized colloidal hydrogel particles using evaporating drops of colloidal suspensions is demonstrated. The films range in thickness from a monolayer to approximately fifty particle diameters depending on initial particle volume fraction. Sessile droplets of hydrogel‐particle suspensions are evaporated on silicon wafers. The film is formed from particles spread densely over the air–water interface which then cross‐link and are deposited on the surface during the evaporation process. The resultant thin films exhibit a temperature‐responsiveness characteristic of the individual particles permitting modulation of size, shape, porosity, and optical transmission.     

The influences of particle–particle interaction and viscosity of carrier fluid on characteristics of silica and calcium carbonate suspensions-coated Twaron® composite

The effects of particle–particle interaction and viscosity of carrier fluid on steady and dynamic rheological responses and quasi-static penetration resistance of Twaron® fabrics treated with shear thickening and shear thinning suspensions have been investigated. The suspensions have been made by mechanically dispersing 60 nm silica (SiO₂) and calcium carbonate (CaCO₃) nanoparticles in poly ethylene glycol (PEG) with molecular weights of 200 and 400 g/mol. The CaCO₃ suspensions display shear thinning behaviour along with the total dominance of the elastic state over the viscous state while the SiO₂ suspensions exhibit shear thickening behaviour with the emergence of both the elastic and viscous states. With the increase of molecular weight of PEG, viscosity, viscoelastic modules and instability of the suspensions increase and critical shear rate and frequency of transition to elastic state diminish. The PEG200 and PEG400-contained SiO₂ suspensions-treated Twaron® composites at 35 wt.% have quasi-static penetration resistances which are nearly 2.63 and 2.48 times and maximum absorbed energies which are about 1.54 and 1.55 times higher, respectively, than those of the corresponding CaCO₃ ones. However, the influence of increasing the PEG's molecular weight is not as considerable as the effect of particle–particle interaction on the enhancement of penetration resistance performance.