NDLI: Dual frequency open-loop electric potential microscopy for local potential measurements in electrolyte solution with high ionic strength.

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Dual frequency open-loop electric potential microscopy for local potential measurements in electrolyte solution with high ionic strength.

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Dual frequency open-loop electric potential microscopy for local potential measurements in electrolyte solution with high ionic strength.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kobayashi, Naritaka Fukuma, Takeshi Asakawa, Hitoshi
Description	Country affiliation: Japan Author Affiliation: Kobayashi N ( Frontier Science Organization, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.)
Abstract	Recent development of open-loop electric potential microscopy (OL-EPM) has enabled to measure local potential distribution at a solid/liquid interface. However, the operating environment of OL-EPM has been limited to a weak electrolyte solution (<1 mM). This has significantly limited its application range in biology and chemistry. To overcome this limitation, we have developed dual frequency (DF) mode OL-EPM. In the method, an ac bias voltage consisting of two frequency components at f(1) and f(2) is applied between a tip and sample. The local potential is calculated from the amplitudes of the f(1) and \|f(1) - f(2)\| components of the electrostatic force. In contrast to the conventional single frequency (SF) mode OL-EPM, the detection of the 2f(1) component is not required in DF mode. Thus, the maximum bias modulation frequency in DF mode is twice as high as that in SF mode. The high bias modulation frequency used in DF mode prevents the generation of electrochemical reactions and redistribution of ions and water, which enables to operate OL-EPM even in a strong electrolyte solution. In this study, we have performed potential measurements of nanoparticles on a graphite surface in 1 and 10 mM NaCl solution. The results demonstrate that DF mode OL-EPM allows measurements of local potential distribution in 10 mM electrolyte solution.
ISSN	00346748
Issue Number	3
Volume Number	83
e-ISSN	10897623
Journal	Review of Scientific Instruments
Language	English
Publisher	American Institute of Physics
Publisher Date	2012-03-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Electromagnetic Phenomena Microscopy Methods Sodium Chloride Chemistry Electrolytes Instrumentation Osmolar Concentration Solutions Static Electricity Journal Article Research Support, Non-u.s. Gov't Discipline Physics Discipline Chemistry
Content Type	Text
Resource Type	Article
Subject	Medicine Instrumentation

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