Tunable aqueous virtual micropore.

Tunable aqueous virtual micropore.
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DOI:
10.1002/smll.201101739
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发表时间:
2012-03-26
期刊:
影响因子:
13.3
通讯作者:
Krstic, Predrag S.
Krstic, Predrag S.
中科院分区:
材料科学1区
文献类型:
--
作者:
Park, Jae Hyun;Guan, Weihua;Reed, Mark A.;Krstic, Predrag S.

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带电微粒可以通过形成窄的虚拟孔(圆柱形空间区域)而被捕获在水性环境中,在该圆柱形空间区域中,粒子在径向方向上的运动受到粒子电荷和偶极矩与外部射频四极电场的动态相互作用所产生的力的限制。如果粒子满足陷阱稳定性标准,则由于水性环境的粘度,其平均运动随时间呈指数减小。此后,粒子的长时间运动只受到随机的,布朗波动,其幅度,电泳和介电泳效应的影响,并添加到颗粒的大小,确定的虚拟孔的半径,我们证明通过计算机模拟和实验的比较。虚拟纳米孔的测量尺寸可用于估计捕获的微物体的电荷。
A charged micro-particle can be trapped in an aqueous environment by forming a narrow virtual pore – a cylindrical space region in which the particle motion in the radial direction is limited by forces emerging from dynamical interactions of the particle charge and dipole moment with external radio-frequency quadrupole electric field. If the particle satisfies the trap stability criteria its mean motion is reduced exponentially with time due to the viscosity of the aqueous environment. Thereafter the long-time motion of particle is subject only to random, Brownian fluctuations, whose magnitude, influenced by the electrophoretic and dielectrophoretic effects and added to the particle size, determines the radius of the virtual pore, which we demonstrate by comparison of computer simulations and experiment. The measured size of the virtual nanopore could be utilized to estimate the charge of a trapped micro-object.
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