A biomimetic approach is used to generate a directed transversal transportation of micron-sized particles in liquids based on the principle of cilia-type arrays in coordinated motion. Rows of flaps mimicking planar ci...A biomimetic approach is used to generate a directed transversal transportation of micron-sized particles in liquids based on the principle of cilia-type arrays in coordinated motion. Rows of flaps mimicking planar cilia are positioned off-centre along an array of cavities covered with membranes that support the flaps. These membranes are deflected from a concave to a convex shape and vice versa by pneumatic actuation applying positive and negative pressures (relative to the ambient) inside the cavities. As a result, the flap on top of the membrane tilts to the left or right within such a pressure cycle, performing a beat stroke. Since each cavity can be addressed in the device individually and in rapid succession, waves of coordinated flap motion can be run along the wall. Such metachronal waves are generated and transport of particles along the cilia surface is achieved in both symplectic and antiplectic direction. It is shown that the initial tilt of the flaps relative to the wall-normal determines the direction of transport.展开更多
In the research of bio-molecular chips and sensors,extra electric biases are most often employed to control and manipulate the DNA and protein molecules moving through micro/nano-fluidic channels.In order to accuratel...In the research of bio-molecular chips and sensors,extra electric biases are most often employed to control and manipulate the DNA and protein molecules moving through micro/nano-fluidic channels.In order to accurately and flexibly control the bio-molecules as they move within the channels,a clear understanding of how the current changes within the buffer solution caused by an applied bias is fundamental.In this report,the current changed value of different buffer solutions,e.g.,KCl,TE,and TBE was systematically studied with real-time monitoring and quantitative analysis in the situation of the buffers moving through a fluidic channel with a 5 m inner diameter,driven by biases of 50 or 100 mV.The results revealed that the relationship between the current changed value and the pause interval of the applied electric field is highly consistent with the Hill Equation,which is helpful for accurately detecting and manipulating single biomolecules in microfluidic sensors and biochips.展开更多
河水与海水之间存在的渗透能是一种新型、可持续的能源,并引起了人们的广泛关注.其中,通过反向电渗析技术,纳流体膜能够从盐度梯度中捕获这种能量.然而,目前的膜材料存在一些不足,例如膜阻过高、稳定性差以及电荷密度低等,这在很大程度...河水与海水之间存在的渗透能是一种新型、可持续的能源,并引起了人们的广泛关注.其中,通过反向电渗析技术,纳流体膜能够从盐度梯度中捕获这种能量.然而,目前的膜材料存在一些不足,例如膜阻过高、稳定性差以及电荷密度低等,这在很大程度上限制了它们的进一步应用.在这项研究中,我们设计了一种高性能的纳米复合膜,该膜采用纤维素为主体并与氧化石墨烯复合,具有类似“水泥-鹅卵石”结构的稳定骨架,有利于增强离子跨膜传输.在人工河水和海水环境中,复合膜的输出功率密度可达5.26 W m^(−2).此外,该膜在质子梯度条件下的功率密度超过67 W m^(−2),且具有良好的耐酸性能,可长期使用.复合膜应用的多样性得益于机械强度高的纤维素与氧化石墨烯纳米结构间的结合作用.在这项工作中,我们展示了利用化学势梯度提取能量并且实现工业废水处理的前景.展开更多
文摘A biomimetic approach is used to generate a directed transversal transportation of micron-sized particles in liquids based on the principle of cilia-type arrays in coordinated motion. Rows of flaps mimicking planar cilia are positioned off-centre along an array of cavities covered with membranes that support the flaps. These membranes are deflected from a concave to a convex shape and vice versa by pneumatic actuation applying positive and negative pressures (relative to the ambient) inside the cavities. As a result, the flap on top of the membrane tilts to the left or right within such a pressure cycle, performing a beat stroke. Since each cavity can be addressed in the device individually and in rapid succession, waves of coordinated flap motion can be run along the wall. Such metachronal waves are generated and transport of particles along the cilia surface is achieved in both symplectic and antiplectic direction. It is shown that the initial tilt of the flaps relative to the wall-normal determines the direction of transport.
基金supported by the Major Research Plan of the National Natural Science Foundation of China(Grant No.91123030)the Interna-tional Cooperation Foundation of the National Science and Technology Major Project of the Ministry of Science and Technology of China(Grant No.2011DFA12220)the National Natural Science Foundation of China(Grant No.61378083)
文摘In the research of bio-molecular chips and sensors,extra electric biases are most often employed to control and manipulate the DNA and protein molecules moving through micro/nano-fluidic channels.In order to accurately and flexibly control the bio-molecules as they move within the channels,a clear understanding of how the current changes within the buffer solution caused by an applied bias is fundamental.In this report,the current changed value of different buffer solutions,e.g.,KCl,TE,and TBE was systematically studied with real-time monitoring and quantitative analysis in the situation of the buffers moving through a fluidic channel with a 5 m inner diameter,driven by biases of 50 or 100 mV.The results revealed that the relationship between the current changed value and the pause interval of the applied electric field is highly consistent with the Hill Equation,which is helpful for accurately detecting and manipulating single biomolecules in microfluidic sensors and biochips.
基金supported by the National Key R&D Program of China(2017YFA0206904 and 2017YFA0206900)the National Natural Science Foundation of China(21625303,22122207,2190528721988102)。
文摘河水与海水之间存在的渗透能是一种新型、可持续的能源,并引起了人们的广泛关注.其中,通过反向电渗析技术,纳流体膜能够从盐度梯度中捕获这种能量.然而,目前的膜材料存在一些不足,例如膜阻过高、稳定性差以及电荷密度低等,这在很大程度上限制了它们的进一步应用.在这项研究中,我们设计了一种高性能的纳米复合膜,该膜采用纤维素为主体并与氧化石墨烯复合,具有类似“水泥-鹅卵石”结构的稳定骨架,有利于增强离子跨膜传输.在人工河水和海水环境中,复合膜的输出功率密度可达5.26 W m^(−2).此外,该膜在质子梯度条件下的功率密度超过67 W m^(−2),且具有良好的耐酸性能,可长期使用.复合膜应用的多样性得益于机械强度高的纤维素与氧化石墨烯纳米结构间的结合作用.在这项工作中,我们展示了利用化学势梯度提取能量并且实现工业废水处理的前景.
