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- W3016101094 abstract "Recently introduced nanoscale electrokinetic phenomenon called ion concentration polarization (ICP) has been suffered from serious pH changes to the sample fluid. A number of studies have focused on the origin of pH changes and strategies for regulating it. Instead of avoiding pH changes, in this work, we tried to demonstrate new ways to utilize this inevitable pH change. First, one can obtain a well-defined pH gradient in proton-received microchannel by applying a fixed electric current through a proton exchange membrane. Furthermore, one can tune the pH gradient on demand by adjusting the proton mass transportation (i.e., adjusting electric current). Secondly, we demonstrated that the occurrence of ICP can be examined by sensing a surrounding pH of electrolyte solution. When pH > threshold pH, patterned pH-responsive hydrogel inside a straight microchannel acted as a nanojunction to block the microchannel, while it did as a microjunction when pH < threshold pH. In case of forming a nanojunction, electrical current significantly dropped compared to the case of a microjunction. The strategies that presented in this work would be a basis for useful engineering applications such as a localized pH stimulation to biomolecules using tunable pH gradient generation and portable pH sensor with pH-sensitive hydrogel." @default.
- W3016101094 created "2020-04-17" @default.
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- W3016101094 date "2020-04-10" @default.
- W3016101094 modified "2023-10-16" @default.
- W3016101094 title "Controllable pH Manipulations in Micro/Nanofluidic Device Using Nanoscale Electrokinetics" @default.
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- W3016101094 doi "https://doi.org/10.3390/mi11040400" @default.
- W3016101094 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7231315" @default.
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- W3016101094 hasPublicationYear "2020" @default.
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