Shift of isoelectric point in extended nanospace investigated by streaming current measurement

Morikawa, Kyojiro; Mawatari, Kazuma; Kazoe, Yutaka; Tsukahara, Takehiko; Kitamori, Takehiko

doi:10.1063/1.3644481

Cited by 20 publications

(25 citation statements)

References 18 publications

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“…For a specified surface charge, the unknowns, i.e., c well ± , χ and ψ 0 , can be obtained by solving Eqs. (12), (13), (15), and (17) together. The overlapped EDL potential distribution (ψ) and ion distribution (c ± ) across the nanochannel height can then be obtained from Eqs.…”

Section: A Poisson-boltzmann Model For Overlapped Edl In Nanochannelsmentioning

confidence: 95%

“…In other words, ψ 0 is the only unknown and can therefore be solved directly from Eq. (13). The zeta potential ψ(h) = ζ , i.e., the electrical potential at the shear plane of the EDL, 60, 61 can then be obtained by substituting the value of ψ 0 into Eq.…”

Section: A Poisson-boltzmann Model For Overlapped Edl In Nanochannelsmentioning

confidence: 99%

“…(12), (13), (15), and (17) is necessary to solve the overlapped EDL field for a specific surface charge. However, in most experiments, the volume of the wells is much larger than that of the nanochannel (i.e., 2V well V ch ), e.g., V well ≈ 13 mm 3 and V ch ≈ 10 −4 mm 3 for a channel system with a channel length of l = 1 cm, a channel width of w = 100 μm, a channel height of 2h = 100 nm, a well diameter of D well = 4 mm, and a well depth of d well = 1 mm.…”

Section: A Overlapped Edl In Nanochannelsmentioning

confidence: 99%

“…13 Most of these unique transport phenomena can be attributed to the presence of an overlapped electrical double layer (EDL) in the flow passage. Such a phenomenon occurs when the channel size is comparable to that of the EDL dimension, i.e., several nanometers to ∼100 nm.…”

Section: Introductionmentioning

confidence: 99%

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Liquid flow retardation in nanospaces due to electroviscosity: Electrical double layer overlap, hydrodynamic slippage, and ambient atmospheric CO2 dissolution

et al. 2012

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A theoretical investigation is performed into the electroviscous-induced retardation of liquid flows through finitely long nanochannels or nanotubes with large wells at either end. Given the assumption of equilibrium conditions between the ionic solution in the wells and that within the nanochannel or nanotube, an exact solution is derived for the overlapped electrical double layer (EDL) for the case where the concentrations of the positive and negative ions in the wells may be unequal. The ion concentrations in the wells are determined by the conditions of global electroneutrality and mass conservation. It is shown that the overlapped EDL model proposed by Baldessari and Santiago [J. Colloid Interface Sci. 325, 526 (2008)10.1016/j.jcis.2008.06.007] is in fact the same as the “thick EDL model” (i.e., the traditional Poisson-Boltzmann model) when the positive and negative ion concentrations in the large enough wells are both equal to the bulk concentration of the salt solution. Utilizing the proposed overlapped EDL analytical model, an investigation is performed to evaluate the effects of hydrodynamic slippage on the flow retardation caused by electroviscosity in nanochannels or nanotubes. Furthermore, exact and approximate solutions are derived for the electroviscosity in ion-selective nanochannels and nanotubes. It is shown that in the absence of slip, the maximum electroviscosity in nanochannels and nanotubes containing a unipolar solution of simple monovalent counter-ions occurs at surface charge densities of h|σ| = 0.32 nm × C/m2 and a|σ| ≈ 0.4 nm × C/m2, respectively. In addition, it is shown that the electroviscosity in a nanotube is smaller than that in a nanochannel. For example, given a LiCl solution, the maximum electroviscosites in a non-slip nanochannel and non-slip nanotube are ηa/η ≈ 1.6 and 1.47, respectively. For both nanospaces, the electroviscosity is greatly increased when the liquid slip effect is taken into account. Significantly, under slip conditions, the electroviscosity in the nanotube is greater than that in the nanochannel. Finally, an investigation is performed into the effects of ambient atmospheric CO2 dissolution on the electroviscosities of salt/buffer solution and deionized (DI) water in silica nanochannels. The results show that the electroviscosity of CO2-saturated DI water (pH = 5.6) can be reasonably neglected in silica nanochannels with a height of less than 100 nm.

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Section: A Poisson-boltzmann Model For Overlapped Edl In Nanochannelsmentioning

confidence: 95%

Section: A Poisson-boltzmann Model For Overlapped Edl In Nanochannelsmentioning

confidence: 99%

Section: A Overlapped Edl In Nanochannelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Liquid flow retardation in nanospaces due to electroviscosity: Electrical double layer overlap, hydrodynamic slippage, and ambient atmospheric CO2 dissolution

et al. 2012

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“…Morikawa et al developed a streaming potential/current measurement system for square extended nanochannels and proved their performance using KCl solutions [58]. By using this method, isoelectric points in extended nanochannels fabricated by fused-silica were measured [59]. Since the streaming current is flow of mobile counter ions by pressure driven flow, dissociation of silanol groups on the surface:…”

Section: Proton Behavior In Extended Nanospacementioning

confidence: 99%

Micro and Extended-Nano Fluidics and Optics for Chemical and Bioanalytical Technology

Mawatari

Pihosh

Shimizu

et al. 2013

Progress in Nanophotonics 2

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Integrated chemical systems on microfluidic chips are further downscaling to 10 1 -10 3 nm scale, which we call extended-nano space. The extended-nano space is a transient space from single molecules to bulk condensed phase, and new liquid properties can be expected in fluidics and chemistry. Actually, many unique liquid properties are increasingly reported which are quite different with microspace. In addition, development of new chemical devices is in progress by utilizing the unique characteristics of extended nanospace. Although new research area is being formed, there exist many challenges in fundamental technologies (nanofabrication, fluidic control, detection, partial surface modification, etc.) due to the extremely small size. Optical near field (ONF) technology is one promising solution because the size of ONF is comparable with extended-nano space and also has unique optical properties such as non-adiabatic optical transitions. In this chapter, we introduce our approach to construct a new micro and extended-nano chemical systems by utilizing the unique characteristics of ONF.

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Investigation of Unique Protonic and Hydrodynamic Behavior of Aqueous Solutions Confined in Extended Nanospaces

Morikawa

Tsukahara

2014

Israel Journal of Chemistry

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A millimeter‐sized neural building block (NBB) shows high versatility to form a 3D heterogeneous neural component. A millimeter‐sized 3D neural network between heterogeneous neural tissues is established, and an efficient technique is then developed to observe the spatiotemporal metrological changes of single neuron in the NBB. This technique allows the visualization of axonal extension, dendritic branching, and morphological changes of presynaptic components and synapses in real time.

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Shift of isoelectric point in extended nanospace investigated by streaming current measurement

Cited by 20 publications

References 18 publications

Liquid flow retardation in nanospaces due to electroviscosity: Electrical double layer overlap, hydrodynamic slippage, and ambient atmospheric CO2 dissolution

Liquid flow retardation in nanospaces due to electroviscosity: Electrical double layer overlap, hydrodynamic slippage, and ambient atmospheric CO2 dissolution

Micro and Extended-Nano Fluidics and Optics for Chemical and Bioanalytical Technology

Investigation of Unique Protonic and Hydrodynamic Behavior of Aqueous Solutions Confined in Extended Nanospaces

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