tailieunhanh - Báo cáo hóa học: " Wettability Modification of Nanomaterials by Low-Energy Electron Flux"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Wettability Modification of Nanomaterials by Low-Energy Electron Flux | Nanoscale Res Lett 2009 4 1209-1217 DOI s11671-009-9380-0 NANO EXPRESS Wettability Modification of Nanomaterials by Low-Energy Electron Flux I. Torchinsky G. Rosenman Received 9 March 2009 Accepted 15 June 2009 Published online 2 July 2009 to the authors 2009 Abstract Controllable modification of surface free energy and related properties wettability hygroscopicity agglomeration etc. of powders allows both understanding of fine physical mechanism acting on nanoparticle surfaces and improvement of their key characteristics in a number of nanotechnology applications. In this work we report on the method we developed for electron-induced surface energy and modification of basic related properties of powders of quite different physical origins such as diamond and ZnO. The applied technique has afforded gradual tuning of the surface free energy resulting in a wide range of wettability modulation. In ZnO nanomaterial the wettability has been strongly modified while for the diamond particles identical electron treatment leads to a weak variation of the same property. Detailed investigation into electron-modified wettability properties has been performed by the use of capillary rise method using a few probing liquids. Basic thermodynamic approaches have been applied to calculations of components of solid-liquid interaction energy. We show that defect-free low-energy electron treatment technique strongly varies elementary interface interactions and may be used for the development of new technology in the field of nanomaterials. Keywords Nanomaterials Wettability Low-energy electron irradiation Thermodynamic properties I. Torchinsky G. Rosenman El Department of Physical Electronics School of Electrical Engineering Tel Aviv University Tel Aviv 69978 Israel e-mail gilr@ I. Torchinsky e-mail ilya@ Introduction Finely divided submicron and nanoscale solid materials demonstrate anomalous properties at both nano- and microscales due to their huge