Announcements

GSSE Seminar by De-Hao Tsai - Tuesday, 21 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: Development of New Colloidal Nanomaterials: Surface Functionalization and Colloidal Stability

 

Date: 21 May 2019

 

Time: 11:00-12:00

 

Cookie & Tea: 11:00

 

Place: ENG Z15

 

Host: Assoc. Prof. Seda Kızılel

 

Abstract:

We present a systematic study on the developments of new colloidal nanomaterials from the prospects of material synthesis and characterization. For nanomaterial synthesis, we create different functionalities via molecular conjugation on the surface of nanomaterials, including the controlled formation of dithiothreitol-conjugated gold nanoparticle clusters and assembly of nanosheet graphene oxide with silver nanoparticles. A facile emulsion-based method is developed to prepare surface-functionalized tripod gold nanoparticle with high colloidal stability.

For nanomaterial characterization, electrospray-differential mobility analysis (ES-DMA), an aerosol-based electrophoretic approach, is employed to study surface functionalization and colloidal stability of new colloidal nanomaterials, including dis-assembly/de-aggregation of metal-organic framework, electrostatic assembly of nanosheet graphene oxide-based hybrids, surface PEGylation of gold and silver nanoparticles, and ligand-nanoparticles interactions. Complementary physical, microscopic and spectroscopic characterization methods are incorporated to the study, allowing for applications of the colloidal nanomaterial involving the control of physical size and homogeneity and further proving the capability of in-situ semi-quantitative analysis in a variety of aqueous formulations. The work presents a new concept for the technological development of new colloidal nanomaterials using a combination of colloid and aerosol-based approaches. 

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.