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Volume 7, Issue 6(Suppl)
J Chromatogr Sep Tech
ISSN: 2157-7064 JCGST, an open access journal
Page 60
Notes:
Separation Techniques 2016
September 26-28, 2016
conferenceseries
.com
Separation Techniques
September 26-28, 2016 Valencia, Spain
2
nd
International Conference and Expo on
Effect of pressure on crystal structure of metal oxides formed in supercritical CO
2
emulsified
solution
Tso Fu Mark Chang
1, 2
, Wei Hao Lin
1, 3
, Chun Yi Chen
1, 2
, Yung Jung Hsu
3
and Masato Sone
1, 2
1
Tokyo Institute of Technology, Japan
2
Japan Science and Technology Agency, Japan
3
National Chiao Tung University, Taiwan
M
etal oxides such as TiO
2
and ZnO are widely applied as biosensors, biomaterials and as the support in a drug delivery
system because of the high biocompatibility. The synthetic approaches include hydrothermal methods, cathodic
deposition, anodic oxidation and sol-gel method. Among them, cathodic deposition offers a low-cost yet effective process for
production of metal oxides with controllable morphology. However, the as-deposited TiO
2
and SnO
2
are usually amorphous.
An additional heat treatment process, for example, annealing at 400°C for 1 hr, is needed to obtain crystalline TiO
2
. The need
of the post-heat hinders the applicability of the products. Therefore, it is practically significant if crystalline metal oxides can
be obtained directly from the cathodic deposition without the additional heat treatment, or lower the temperature needed in
the heat treatment. On the other hand, the effect of pressure on the crystallinity of metal oxides deposited from the solution
phase is rarely investigated. In a previous study, grain size of the TiO
2
cathodically deposited with a supercritical CO
2
(sc-CO
2
)
emulsified electrolyte (SCEM) was found to be increased with an increase in the pressure. In this later study, crystal structure of
the TiO
2
, ZnO, and SnO
2
were found to be affected by the applied pressure used during the deposition. The as-deposit TiO
2
and
SnO
2
were found to be composed of nano-crystallines when the SCEM was applied. In this presentation, the effect of pressure
on crystal structure of metal oxides deposited using the SCEM will be reported.
Biography
Tso Fu Mark Chang has
received his BASc in Chemical Engineering from the University of Toronto (2004), MS in Chemical Engineering from National Tsing Hua
University (2007) and PhD in Materials Science and Engineering from Tokyo Institute of Technology (2012). He is currently an Assistant Professor of Precision
and Intelligence Laboratory at Tokyo Institute of Technology. His research interests include pressure and solvent effects on reactions in supercritical CO
2
and
characterization of the materials fabricated in supercritical CO
2
. He has published more than 50 papers in reputed journals.
chang.m.aa@m.titech.ac.jpTso Fu Mark Chang et al., J Chromatogr Sep Tech 2016, 7:6(Suppl)
http://dx.doi.org/10.4172/2157-7064.C1.019