By a News Reporter-Staff News Editor at Life Science Weekly -- Fresh data on Minerals are presented in a new report. According to news reporting out of Jhongli, Taiwan, by NewsRx editors, research stated, "Superhydrophilic graphite surfaces and water-dispersible graphite colloids are obtained by electrochemical exfoliation with hydrophobic graphite electrodes. Such counterintuitive characteristics are caused by partial oxidation and investigated by examining both graphite electrodes and exfoliated particles after electrolysis."
Our news journalists obtained a quote from the research from National Central University, "The extent of surface oxidation can be explored through contact angle measurement, scanning electron microscope, electrical sheet resistance, x-ray photoelectron spectroscopy, zeta-potential analyzer, thermogravimetric analysis, UV-visible, and Raman spectroscopy. The degree of wettability of the graphite anode can be altered by the electrolytic current and time. The water contact angle declines generally with increasing the electrolytic current or time. After a sufficient time, the graphite anode becomes superhydrophilic and its hydrophobicity can be recovered by peeling with adhesive tape. This consequence reveals that the anodic graphite is oxidized by oxygen bubbles but the oxidation just occurs at the outer layers of the graphite sheet. Moreover, the characteristics of oxidation revealed by UV peak shift, peak ratio between D and G bands, and negative zeta-potential indicate the presence of graphite oxide on the outer shell of the exfoliated colloids. However, thermogravimetric analysis for the extent of decomposition of oxygen functional groups verifies that the amount of oxygen groups is significantly less than that of graphite oxide prepared via Hummer method. The structure of this partially oxidized graphite may consist of a graphite core covered with an oxidized shell. The properties of the exfoliated colloids are also influenced by pH of the electrolytic solution. As pH is increased, the extent of oxidation descends and the thickness of oxidized shell decreases."
According to the news editors, the research concluded: "Those results reveal that the degree of oxidation of exfoliated nanoparticles can be manipulated simply by controlling pH."
For more information on this research see: Superhydrophilic graphite surfaces and water-dispersible graphite colloids by electrochemical exfoliation. Journal of Chemical Physics, 2013;139(6):402-412. Journal of Chemical Physics can be contacted at: Amer Inst Physics, Circulation & Fulfillment Div, 2 Huntington Quadrangle, Ste 1 N O 1, Melville, NY 11747-4501, USA. (American Institute of Physics - www.aip.org/; Journal of Chemical Physics - jcp.aip.org/)
Our news journalists report that additional information may be obtained by contacting Y.F. Li, Natl Cent Univ, Dept. of Chem & Mat Engn, Dept. of Phys, Jhongli 320, Taiwan. Additional authors for this research include S.M. Chen, W.H. Lai, Y.J. Sheng and H.K. Tsao (see also Minerals).
Keywords for this news article include: Asia, Taiwan, Carbon, Jhongli, Graphite, Minerals, Chemistry, Chalcogens, Electrochemical
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