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Huan Liang 《中国物理 B》2022,31(10):104702-104702
Thermophoresis and diffusiophoresis respectively refer to the directed drift of suspended particles in solutions with external thermal and chemical gradients, which have been widely used in the manipulation of mesoscopic particles. We here study a phoretic-like motion of a passive colloidal particle immersed in inhomogeneous active baths, where the thermal and chemical gradients are replaced separately by activity and concentration gradients of the active particles. By performing simulations, we show that the passive colloidal particle experiences phoretic-like forces that originate from its interactions with the inhomogeneous active fluid, and thus drifts along the gradient field, leading to an accumulation. The results are similar to the traditional phoretic effects occurring in passive colloidal suspensions, implying that the concepts of thermophoresis and diffusiophoresis could be generalized into active baths. 相似文献
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岩土材料滑移线场理论中的应力间断线 总被引:6,自引:0,他引:6
根据非特征线应力边界条件的显示解析表达式,明确给出了岩土材料滑移线场理论中应力间断线上的应力条件,应力间断值及其位置,使得锐角楔体极限荷载等问题的求解更简单,更方便。 相似文献
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The pH-sensitive copolymer hydrogels were prepared with the monomers of acrylic acid and N-vinyl-2-pyrrolidone based on gamma radiation technique. The morphology of the hydrogels was monitored by using scanning electron microscope. The influence of absorbed dose, monomer compasition and concentration on the swelling ratio (SR) of the hydrogels were investigated in detail. The effect of pH and temperature of the swelling medium on the swelling behavior of the hydrogels were also examined. The results show that the SR of the copolymer hydrogels decreases with the monomer concentration and absorbed dose increasing. The copolymer hydrogels show a better pH-sensitive behavior. In alkaline solution, the SR of the hydrogels is much higher than in acid solution. 相似文献
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以聚乙烯醇(PVA)为基体,以壳聚糖(CS)为功能性添加剂,采用冻融法与辐射法相结合的工艺技术制备出CS/PVA水凝胶.分别研究了吸收剂量和制备工艺对PVA水凝胶性能和SEM形貌的影响;研究了壳聚糖浓度和制备工艺对CS/PVA水凝胶溶胀性能和力学性能的影响;研究了CS/PVA水凝胶对大肠杆菌的抑菌效果.结果表明:采用先冻融后辐射方法制备PVA水凝胶,该制备工艺既解决了冻融法合成水凝胶不透明的问题,又解决了辐射法合成水凝胶起泡和强度较弱的问题. CS的添加,不仅提高了PVA水凝胶的溶胀性能,而且使得CS/PVA水凝胶对大肠杆菌具有较好的抑菌作用. 相似文献
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自驱动粒子在靠近边界尤其是平面上障碍物的边界时,会展现出奇特的运动行为.本文通过实验研究了固定于平面上的微米级障碍物的几何效应(包括大小和形状)对双氧水驱动的Janus微球运动行为的影响.实验结果表明,当障碍物尺寸超过临界值后,自驱动的Janus微球会被其"捕获"并沿着其边界定向运动.自驱动粒子在障碍物边界的停留时间及运动速率随着双氧水浓度的增加而增大,且其在圆柱形障碍物边界和球形障碍物边界的停留时间及运动速率均随着障碍物直径的增加而增大.但在相同的双氧水浓度和障碍物直径条件下,自驱动粒子在圆柱边界上的停留时间比其在球形障碍物边界上长;在圆柱边界上的运动速率比在球形障碍物边界上小,揭示了自驱动粒子在障碍物边界上的运动行为与障碍物的几何特性密切相关.本研究有助于进一步理解自驱动粒子在不同大小及形状的障碍物中的运动特征,掌握并利用这些特征在诸如设计特殊几何形状来引导自驱动粒子的运动等领域有很好的应用价值. 相似文献
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杨明成 《宁夏大学学报(自然科学版)》1992,13(3):53-61
本文论述了三维粘弹塑性有限元分析的基本原理,给出了与六面体八节点等参单元配合使用的四节点无界元的整套算式,并结合算例,讨论了这种单元应用在粘弹塑性有限元分析中的有关问题。 相似文献