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Sung Jae Kim - One of the best experts on this subject based on the ideXlab platform.
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Capillarity Ion concentratIon polarizatIon as spontaneous desalting mechanism.
Nature communications, 2016Co-Authors: Sungmin Park, Yeonsu Jung, Seok Young Son, Inhee Cho, Youngrok Cho, Hyomin Lee, Ho-young Kim, Sung Jae KimAbstract:To overcome a world-wide water shortage problem, numerous desalinatIon methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity Ion concentratIon polarizatIon. An Ion-depletIon zone is spontaneously formed near a nanoporous material by the permselective Ion transportatIon driven by the capillarity of the material, in contrast to electrokinetic Ion concentratIon polarizatIon which achieves the same Ion-depletIon zone by an external d.c. bias. This capillarity Ion concentratIon polarizatIon device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditIons are conducted to characterize this phenomenon. These results indicate that the capillarity Ion concentratIon polarizatIon system can offer unique and economical approaches for a power-free water purificatIon system.
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Capillarity Ion concentratIon polarizatIon for spontaneous biomolecular preconcentratIon mechanism
Biomicrofluidics, 2016Co-Authors: Hyomin Lee, Seok Young Son, Sung Jae Kim, Pilnam KimAbstract:Ionic hydrogel-based Ion concentratIon polarizatIon devices have been demonstrated as platforms to study nanoscale Ion transport and to develop engineering applicatIons, such as protein preconcentratIon and Ionic diodes/transistors. Using a microfluidic system composed of a perm-selective hydrogel, we demonstrated a micro/nanofluidic device for the preconcentratIon of biological samples using a new class of Ion concentratIon polarizatIon mechanism called "capillarity Ion concentratIon polarizatIon" (CICP). Instead of an external electrical voltage source, the capillary force of the perm-selective hydrogel spontaneously generated an Ion depletIon zone in a microfluidic channel by selectively absorbing counter-Ions in a sample solutIon. We demonstrated a reasonable preconcentratIon factor (∼100-fold/min) using the CICP device. Although the efficiency was lower than that of conventIonal electrokinetic ICP operatIon due to the absence of a drift Ion migratIon, this mechanism was free from the undesirable instability caused by a local amplified electric field inside the Ion depletIon zone so that the mechanism should be suitable especially for an applicatIon where the contents were electrically sensitive. Therefore, this simple system would provide a point-of-care diagnostic device for which the sample volume is limited and a simplified sample handling is demanded.
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nanofluidic concentratIon devices for biomolecules utilizing Ion concentratIon polarizatIon theory fabricatIon and applicatIons
Chemical Society Reviews, 2010Co-Authors: Sung Jae Kim, Yong Ak Song, Jongyoon HanAbstract:Recently, a new type of electrokinetic concentratIon devices has been developed in a microfluidic chip format, which allows efficient trapping and concentratIon of biomolecules by utilizing Ion concentratIon polarizatIon near nanofluidic structures. These devices have drawn much attentIon not only due to their potential applicatIon in biomolecule sensing, but also due to the rich scientific content related to Ion concentratIon polarizatIon, the underlying physical phenomenon for the operatIon of these electrokinetic concentratIon devices. This tutorial review provides an introductIon to the scientific and engineering advances achieved, in-depth discussIon about several interesting applicatIons of these unique concentratIon devices, and their current limitatIons and challenges.
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stabilizatIon of Ion concentratIon polarizatIon using a heterogeneous nanoporous junctIon
Nano Letters, 2010Co-Authors: Pilnam Kim, Sung Jae Kim, Jongyoon Han, Kahp Y SuhAbstract:We demonstrate a recycled Ion-flux through heterogeneous nanoporous junctIons, which induce stable Ion concentratIon polarizatIon with an electric field. The nanoporous junctIons are based on integratIon of Ionic hydrogels whose surfaces are negatively or positively charged for catIonic or anIonic selectivity, respectively. Such heterogeneous junctIons can be matched up in a way to achieve continuous Ion-flux operatIon for stable concentratIon gradient or Ionic conductance. Furthermore, the combined junctIons can be used to accumulate Ions on a specific regIon of the device.
Yeonsu Jung - One of the best experts on this subject based on the ideXlab platform.
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Capillarity Ion concentratIon polarizatIon as spontaneous desalting mechanism
Nature Communications, 2016Co-Authors: Sungmin Park, Yeonsu JungAbstract:To overcome a world-wide water shortage problem, numerous desalinatIon methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity Ion concentratIon polarizatIon. An Ion-depletIon zone is spontaneously formed near a nanoporous material by the permselective Ion transportatIon driven by the capillarity of the material, in contrast to electrokinetic Ion concentratIon polarizatIon which achieves the same Ion-depletIon zone by an external d.c. bias. This capillarity Ion concentratIon polarizatIon device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditIons are conducted to characterize this phenomenon. These results indicate that the capillarity Ion concentratIon polarizatIon system can offer unique and economical approaches for a power-free water purificatIon system. The great demand for freshwater for sustaining life on Earth calls for smart solutIons to purify ocean water with minimal energy consumptIon. Here, Park et al . show a passive desalinatIon method via Ion concentratIon polarizatIon generated by capillary-driven flow through Ion-selective hydrogels.
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Capillarity Ion concentratIon polarizatIon as spontaneous desalting mechanism.
Nature communications, 2016Co-Authors: Sungmin Park, Yeonsu Jung, Seok Young Son, Inhee Cho, Youngrok Cho, Hyomin Lee, Ho-young Kim, Sung Jae KimAbstract:To overcome a world-wide water shortage problem, numerous desalinatIon methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity Ion concentratIon polarizatIon. An Ion-depletIon zone is spontaneously formed near a nanoporous material by the permselective Ion transportatIon driven by the capillarity of the material, in contrast to electrokinetic Ion concentratIon polarizatIon which achieves the same Ion-depletIon zone by an external d.c. bias. This capillarity Ion concentratIon polarizatIon device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditIons are conducted to characterize this phenomenon. These results indicate that the capillarity Ion concentratIon polarizatIon system can offer unique and economical approaches for a power-free water purificatIon system.
Sungmin Park - One of the best experts on this subject based on the ideXlab platform.
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Capillarity Ion concentratIon polarizatIon as spontaneous desalting mechanism
Nature Communications, 2016Co-Authors: Sungmin Park, Yeonsu JungAbstract:To overcome a world-wide water shortage problem, numerous desalinatIon methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity Ion concentratIon polarizatIon. An Ion-depletIon zone is spontaneously formed near a nanoporous material by the permselective Ion transportatIon driven by the capillarity of the material, in contrast to electrokinetic Ion concentratIon polarizatIon which achieves the same Ion-depletIon zone by an external d.c. bias. This capillarity Ion concentratIon polarizatIon device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditIons are conducted to characterize this phenomenon. These results indicate that the capillarity Ion concentratIon polarizatIon system can offer unique and economical approaches for a power-free water purificatIon system. The great demand for freshwater for sustaining life on Earth calls for smart solutIons to purify ocean water with minimal energy consumptIon. Here, Park et al . show a passive desalinatIon method via Ion concentratIon polarizatIon generated by capillary-driven flow through Ion-selective hydrogels.
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Capillarity Ion concentratIon polarizatIon as spontaneous desalting mechanism.
Nature communications, 2016Co-Authors: Sungmin Park, Yeonsu Jung, Seok Young Son, Inhee Cho, Youngrok Cho, Hyomin Lee, Ho-young Kim, Sung Jae KimAbstract:To overcome a world-wide water shortage problem, numerous desalinatIon methods have been developed with state-of-the-art power efficiency. Here we propose a spontaneous desalting mechanism referred to as the capillarity Ion concentratIon polarizatIon. An Ion-depletIon zone is spontaneously formed near a nanoporous material by the permselective Ion transportatIon driven by the capillarity of the material, in contrast to electrokinetic Ion concentratIon polarizatIon which achieves the same Ion-depletIon zone by an external d.c. bias. This capillarity Ion concentratIon polarizatIon device is shown to be capable of desalting an ambient electrolyte more than 90% without any external electrical power sources. Theoretical analysis for both static and transient conditIons are conducted to characterize this phenomenon. These results indicate that the capillarity Ion concentratIon polarizatIon system can offer unique and economical approaches for a power-free water purificatIon system.
Mingchun Zhao - One of the best experts on this subject based on the ideXlab platform.
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influence of ph and chloride Ion concentratIon on the corrosIon of mg alloy ze41
Corrosion Science, 2008Co-Authors: Mingchun Zhao, Ming Liu, Guangling Song, Andrej AtrensAbstract:The influence of pH and chloride Ion concentratIon on the corrosIon behaviour of ZE41 was studied using immersIon tests and electrochemical measurements. A shorter incubatIon period to the onset of corrosIon; a more negative corrosIon potential; and a higher corrosIon rate correlated with a higher chloride Ion concentratIon at each pH value and correlated with a lower pH Value for each chloride Ion concentratIon. This corrosIon behaviour is consistent with the current understanding that the corrosIon behaviour of magnesium alloys is governed by a partially protective surface film, with the corrosIon reactIons occurring predominantly at the breaks or imperfectIons of the partially protective film. The implicatIon is that the fractIon of film free surface increases with decreasing bulk pH and with increasing chloride Ion concentratIon, This is consistent with the known tendency of chloride Ions to cause film breakdown and the known instability of Mg(OH)(2) in solutIons with pH less than 10.5. The electrochemical measurements of the corrosIon rate, based on the corrosIon current at the free corrosIon potential, did not agree with direct measurements evaluated from the evolved hydrogen, in agreement with other observatIons for Mg, (C) 2008 Elsevier Ltd. All rights reserved.
Andrej Atrens - One of the best experts on this subject based on the ideXlab platform.
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influence of ph and chloride Ion concentratIon on the corrosIon of mg alloy ze41
Corrosion Science, 2008Co-Authors: Mingchun Zhao, Ming Liu, Guangling Song, Andrej AtrensAbstract:The influence of pH and chloride Ion concentratIon on the corrosIon behaviour of ZE41 was studied using immersIon tests and electrochemical measurements. A shorter incubatIon period to the onset of corrosIon; a more negative corrosIon potential; and a higher corrosIon rate correlated with a higher chloride Ion concentratIon at each pH value and correlated with a lower pH Value for each chloride Ion concentratIon. This corrosIon behaviour is consistent with the current understanding that the corrosIon behaviour of magnesium alloys is governed by a partially protective surface film, with the corrosIon reactIons occurring predominantly at the breaks or imperfectIons of the partially protective film. The implicatIon is that the fractIon of film free surface increases with decreasing bulk pH and with increasing chloride Ion concentratIon, This is consistent with the known tendency of chloride Ions to cause film breakdown and the known instability of Mg(OH)(2) in solutIons with pH less than 10.5. The electrochemical measurements of the corrosIon rate, based on the corrosIon current at the free corrosIon potential, did not agree with direct measurements evaluated from the evolved hydrogen, in agreement with other observatIons for Mg, (C) 2008 Elsevier Ltd. All rights reserved.
