Announcements

GSSE Seminar by De-Hao Tsai - Thursday 23 May 2019, 11:00, Room ENG Z15

Author: Graduate School of Sciences and Engineering
Time: 11:00
Location: ENG Z15

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KOÇ UNIVERSITY

GRADUATE SCHOOL OF SCIENCES AND ENGINEERING

SEMINAR SERIES

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Speaker: De-Hao Tsai - Department of Chemical Engineering, National Tsing Hua University

 

Title: Hybrid Nanocatalysts and Nanoparticles for Energy, Biomedical and Photocatalytic Applications

 

Date: 23 May 2019

 

Time: 11:00-12:00

 

Cookie & Tea: 11:00

 

Place: ENG Z15

 

Host: Assoc. Prof. Seda Kızılel

 

Abstract:

 

In this work, a prototype aerosol-based method is demonstrated for controlled synthesis of hybrid nanocatalysts and nanoparticles. Particle size, crystallite size, and chemical composition and surface state of the nanoparticle via the gas-phase evaporation-induced self-assembly methods are tunable by design directly in the aerosol state. A homogeneous distribution in the hybrid nanostructure creates a large amount of interface for a strong metal-support interfacial interaction. . The Cu- and Ni-based nanoparticles synthesized exhibit a very high catalytic activity with the high durability and stability over CO oxidation, methane combustion and methane dry reforming. Hybridization with CeO2 induces the formation of new active sites at the interface with enhanced reproducibility of active metal and the corresponding catalytic activity.

 

Noble metal-decorated hybrid nanoparticle clusters are also able to synthesize using the proposed gas-phase synthetic method. In addition, the approach includes a direct gas-phase electrophoresis for size classification and in situ characterization of mobility size. Results show a successful synthesis of (1) silver nanoparticles (AgNPs) decorated on a SiO2-NP, (2) AgNPs decorated in a cluster of SiO2-NPs (SiO2-NPC), and (3) AgNPs decorated in a cluster of TiO2-NPs (TiO2-NPC). The performance, colloidal stability, and dispersibility of AgNPs can be enhanced in an aqueous environment after hybridization with SiO2-NPC and TiO2-NPC. This work describes a prototype methodology to form hybrid nanocatalysts and nanoparticles with high purity and well-controlled characteristics, which can be used for energy, biomedical and photocatalytic applications.

 

Biography:

 

Dr. De-Hao Tsai received his BS degree in Chemical Engineering from National Cheng Kung University (1998), obtained his MS in Chemical Engineering from National Tsing Hua University (NTHU; 2000). He has earned his PhD degree in Materials Science and Engineering from University of Maryland (USA) in 2007 under the supervisor of Dr. Michael Zachariah. Prior to the return to NTHU in 2013, Dr. Tsai worked as a research scientist at Cabot Microelectronics Corporation and National Institutes of Standards and Technology(NIST)/University of Maryland from 2008 to 2009 and from 2009 to 2013, respectively. Dr. Tsai main research interests include a combination of colloidal- and aerosol-based approaches for nanomaterial characterization, and aerosol-based controlled synthesis of functional nanoparticles and derivative products for biomedical, energy and environmental applications. Currently Dr. Tsai is serving as the associate department chairman and also the journal editor of Advanced Powder Technology (Elsevier). Dr. Tsai’s has published papers in outstanding journal including JACS, Langmuir, Nanoscale, ACS Applied Materials & Interfaces, Journal of Physical Chemistry C, and Analytical Chemistry. Dr. Tsai has won 2018 Ta-You Wu Memorial Award (for young investigator; Ministry of Science & Technology, R.O.C), 2018 Chemical Engineering Outstanding Paper Award (Taiwan Institute of Chemical Engineers), and 2013 Distinguished NIST Associate Award. His recent work “Real-time size discrimination and elemental analysis of gold nanoparticles using ES-DMA coupled to ICP-MS” has also won the Best Paper Award in Analytical and Bioanalytical Chemistry.