نتایج جستجو برای: concentration polarization

تعداد نتایج: 445199  

Journal: :Analytical chemistry 2008
Rahul Dhopeshwarkar Richard M Crooks Dzmitry Hlushkou Ulrich Tallarek

The electrokinetics and hydrodynamics in a hybrid microfluidic/nanofluidic pore network configuration and its effect on the concentration enrichment of charged analytes are described. A hydrogel microplug, photopolymerized in a microfluidic channel, with negative surface charge serves as a nanoporous membrane and dictates the electrokinetic behavior within the adjoining microchannel compartment...

2015
Sławomir Wąsik Arkadiusz Bryll Marcin Drabik Kazimierz Dworecki Andrzej Ślęzak

We investigate diffusive transport in a membrane system with a horizontally mounted membrane under concentration polarization conditions performed by a laser interferometry method. The data obtained from two different theoretical models are compared to the experimental results of the substance flux. In the first model, the membrane is considered as infinitely thin, while in the second one as a ...

2014
Petar Sabev Varbanov Jiří Jaromír Klemeš Peng Yen Liew Jun Yow Yong Andrea P. Reverberi Bruno Fabiano Cristiano Cerrato Vincenzo G. Dovì

We propose a simulation study in order to evaluate the effects of concentration polarization damping by splitting a single spiral-wound membrane module in two units connected in series inside the same shell. The reverse osmosis process in each unit is described by the advection-diffusion equation in two dimensions which is solved by a finite difference technique. Several feed regimes and operat...

Journal: :Physical review letters 2016
Inhee Cho Wonseok Kim Junsuk Kim Ho-Young Kim Hyomin Lee Sung Jae Kim

The first experimental and theoretical evidence was provided for the non-negligible role of a diffusio-osmosis in the ion concentration polarization (ICP) layer, which had been reported to be in a high Peclet number regime. Under the assumption that the hydrated shells of cations were stripped out with the amplified electric field inside the ICP layer, its concentration profile possessed a stee...

Journal: :The Analyst 2016
Youngkyu Cho Junghyo Yoon David Wonbin Lim Jaehoon Kim Jeong Hoon Lee Seok Chung

In this paper, a method was developed for pre-concentrating large-volume biological samples for subsequent analysis. We previously developed another pre-concentration device, but it unfortunately altered the pH of the sample when an electric field was applied to the sample reservoir. Changes in the pH are not suitable for subsequent antibody-antigen reactions because of the stability issues tha...

This paper studies the corrosion inhibition of Al-Mg alloy system in 0.5 mol/dm3 NaCl solution in the presence of pyrazole derivative using potentiodynamic polarization and linear polarization method. The inhibition efficiency as a function of concentration and temperature was investigated. From the polarization curves, it can be concluded that the pyrazole derivative be...

2013
Pedro Henrique Calais Guerra Wagner Meira Claire Cardie Robert D. Kleinberg

Polarization in social media networks is a fact in several scenarios such as political debates and other contexts such as same-sex marriage, abortion and gun control. Understanding and quantifying polarization is a longterm challenge to researchers from several areas, also being a key information for tasks such as opinion analysis. In this paper, we perform a systematic comparison between socia...

A. Fattah-alhosseini, B. Hamrahi

In this work, electrochemical methods such as Tafel polarization and electrochemical impedance spectroscopy (EIS) were used to study the inhibition efficiency of Nettle leaves hydroalcoholic extract as a green corrosion inhibitor of API 5L carbon steel in 0.5 M H2SO4 solution. The results showed that the inhibition efficiency was increased with increasing the concentration of the extract and th...

ژورنال: مواد پرانرژی 2022

In the current research, the microstructural changes and corrosion behavior of two-layer Steel/Bronze sheets were investigated after the heat treatment of the explosive welding process. The heat treatment was performed at 600ºC for 16 hr. Dynamic potential polarization, electrochemical impedance spectroscopy, optical microscopy, and scanning electron microscopy analyses were used. Based on of t...

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