Charge Properties and Electric Field Energy Density of Functional Group-Modified Nanoparticle Interacting with a Flat Substrate

Deng, Luyu; Shi, Liuyong; Zhou, Teng; Zhang, Xianman; Joo, Sang Woo

doi:10.3390/mi11121038

Cited by 6 publications

(8 citation statements)

References 46 publications

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“…When w = 5, 10 and 30 nm, the curves reached the IEP at pH = 6.0, 5.8 and 5.55, respectively. In addition, the IEP of the PE brush layer without interaction is pH = 5.5 [2], which is the green dot line in Figure 3. At the same time, due to the shift of IEP, with the decrease of the distance between the silica flat substrate and nanoparticle, the volume charge density will decrease.…”

Section: Resultsmentioning

confidence: 99%

Section: The Effect Of Ph Value On the Volume Charge Densitymentioning

confidence: 99%

“…The electric field energy density of the PE brush layer is expressed as follows [2]:

\begin{equation}\omega = \frac{1}{2}{\varepsilon _0}{E^2}\end{equation}

…”

Section: Mathematical Modelmentioning

confidence: 99%

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The interaction between silica flat substrate and functional group–modified nanoparticles

Deng

Shi

et al. 2022

Electrophoresis

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Inspired by nature, the research of functionalized nanoparticles and nanodevices has been in‐depth developed in recent years. In this paper, we theoretically studied the interaction between functional polyelectrolyte brush layer–modified nanoparticles and a silica flat substrate. Based on the Poisson–Nernst–Planck equations, the mathematical model is established. The changes of the volume charge density and electric field energy density when the nanoparticle interacts with the silica flat substrate under multi‐ions regulation were investigated. The results show that when there is a strong interaction between the silica flat substrate and nanoparticles, such as the distances between the nanoparticle and silica flat substrate, which are 2 or 5 nm, the isoelectric point shift under the influence of silica flat substrate and the total charge density in the brush layer is jointly controlled by the cations in the solution and the volume charge density of the brush layer. With the increase of the distances between the nanoparticle and silica flat substrate, the regulation of the volume charge density of the brush layer dominates. These results will provide guidance for the movement mechanism of functionalized nanoparticles in silica nanochannels.

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Section: Resultsmentioning

confidence: 99%

Section: The Effect Of Ph Value On the Volume Charge Densitymentioning

confidence: 99%

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The interaction between silica flat substrate and functional group–modified nanoparticles

Deng

Shi

et al. 2022

Electrophoresis

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“…The aforementioned studies about the electroosmotic thrusters were related to hard/rigid microchannels, so the EOTs with soft material walls can be further considered. The electrokinetic characteristics of soft materials have been focused on and widely implemented in micro/nano-systems [ 19 , 20 , 21 , 22 , 23 , 24 ]. Bartolo and Aarts [ 25 ] showed the advantage of the microfluidic systems combining soft matter with biophysics.…”

Section: Introductionmentioning

confidence: 99%

Space Electroosmotic Thrusters in Ion Partitioning Soft Nanochannels

Zheng

Jian

2021

Micromachines

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Space electroosmotic thrusters (EOTs) are theoretically investigated in a soft charged nanochannel with a dense polyelectrolyte layer (PEL), which is considered to be more realistic than a low-density PEL. When the PEL is dense, its permittivity is smaller than the one of the electrolyte solution layer, leading to rearrangement of ions in the channel, which is denoted as the ion partitioning effect. It is noted that fluid viscosity becomes high within the PEL owing to the hydration effect. An analytical solution for electroosmotic velocity through the channel is obtained by utilizing the Debye–Hückel linearization assumption. Based on the fluid motion, thruster performances, including thrust, specific impulse, thrust-to-power ratio, and efficiency, are calculated. The ion partitioning effect leads to enhancement of the thruster velocity, while increase of the dynamic viscosity inside the PEL reduces the flow rate of the fluid. Therefore, these performances are further impacted by the dense soft material, which are discussed in detail. Moreover, changes or improvements of the thruster performances from the dense PEL to the weak PEL are presented and compared, and distributions of various energy items are also provided in this study. There is a good result whereby the increase in electric double layer thickness promotes the development of thruster performances. Ultimately, the simulated EOTs produce thrust of about 0 to 20 μN and achieve thruster efficiency of 90.40%, while maintaining an appropriate thrust–power ratio of about 1.53 mN/W by optimizing all design parameters.

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“…In particular, the biological complex fluids are mostly dispersed in aqueous solution, in which suspended particulates coated with polyelectrolytes should be characterized by stabilization and electrostatic surface charge with variations of solution pH. Exchanging surface charges with the surrounding ions in a bulk medium affects the behavior of surface potential (cf., experimentally, zeta potential) as well as ionic conductance [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Electrostatic Potential Analysis in Polyelectrolyte Brush-Grafted Microchannels Filled with Polyelectrolyte Dispersion

Chun

2021

Micromachines

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In this study, the model framework that includes almost all relevant parameters of interest has been developed to quantify the electrostatic potential and charge density occurring in microchannels grafted with polyelectrolyte brushes and simultaneously filled with polyelectrolyte dispersion. The brush layer is described by the Alexander-de Gennes model incorporated with the monomer distribution function accompanying the quadratic decay. Each ion concentration due to mobile charges in the bulk and fixed charges in the brush layer can be determined by multi-species ion balance. We solved 2-dimensional Poisson–Nernst–Planck equations adopted for simulating electric field with ion transport in the soft channel, by considering anionic polyelectrolyte of polyacrylic acid (PAA). Remarkable results were obtained regarding the brush height, ionization, electrostatic potential, and charge density profiles with conditions of brush, dispersion, and solution pH. The Donnan potential in the brush channel shows several times higher than the surface potential in the bare channel, whereas it becomes lower with increasing PAA concentration. Our framework is fruitful to provide comparative information regarding electrostatic interaction properties, serving as an important bridge between modeling and experiments, and is possible to couple with governing equations for flow field.

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Charge Properties and Electric Field Energy Density of Functional Group-Modified Nanoparticle Interacting with a Flat Substrate

Cited by 6 publications

References 46 publications

The interaction between silica flat substrate and functional group–modified nanoparticles

The interaction between silica flat substrate and functional group–modified nanoparticles

Space Electroosmotic Thrusters in Ion Partitioning Soft Nanochannels

Electrostatic Potential Analysis in Polyelectrolyte Brush-Grafted Microchannels Filled with Polyelectrolyte Dispersion

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