美国加州大学洛杉矶分校黄昱教授12月27日下午学术报告

发布时间:2011-12-23访问量:25设置

报告人:黄昱,教授

 

Department of Materials Science and Engineering

Univeristy of California, Los Angeles

 

题目:Understanding the Interface Binding Specificity through Shape-Controlled Nanocrystal Synthesis

 

时间:20111227日(星期二)下午300

地点:907-1101


 

摘要:

Synthesis of inorganic nanomaterials with precise maneuver over morphology has always been a central goal in many fields of chemistry and physics since the physical and chemical properties of nanomaterials heavily lean on their size and shape. In general, shape-controlled synthesis of colloidal nanocrystals requires rigorous kinetic control over the crystal growth process, normally achieved using surfactants (or capping agents) to modify surface energetic sequence of the crystal. Small molecules and polymers have been extensively explored for this purpose although the approach remains largely empirical, which may be attributed to the lack of known pathway to identify binding selectivity of these molecules as well as the insufficient understanding of the organic-inorganic interface binding.

Here we demonstrate the identification and utilization of facet-specific peptide sequences as regulating agents for predictable synthesis of platinum nanocrystals with various morphologies in aqueous solution at room temperature. Specifically, Pt-{100} and Pt-{111} binding peptide sequences are identified against Pt-{100} faceted and Pt-{111} faceted substrates through a biomimetic evolution process. Importantly, these facet-specific peptides can be readily used to direct the growth of Pt nanocrystals in a highly predictable manner. The Pt-{100} binding peptide (TLTTLTN) produces cubes enclosed by six {100} facets and the Pt-{111} binding peptide (SSFPQPN) produces tetrahedrons enclosed by four {111} facets, as expected. Further experimental and computational efforts provide molecular details of the interface binding of SSFPQPN on Pt-{111} and Pt-{100}, respectively, and conclude that phenylalanine (F) residue plays an important role in the resulted Pt-{111} selectivity. These studies demonstrate the effectiveness of peptide molecules in controlling nanocrystal morphology through selective binding. More importantly, by establishing a robust surface-molecule binding pair, these studies open up vast opportunities in understanding the molecular details of inorganic-organic interface interaction, which could one day lead to the development of a library of molecular functions for predictable materials engineering.

 

A Short Biography:


Professor Huang explores the unique technological opportunities that result from the structure and assembly of nanoscale building blocks. Focusing on the molecular level, she conducts research to unravel the fundamental principles governing nanoscale material synthesis and assembly; and utilizes such principles to design nanostructures and nanodevices with unique functions and properties to address critical challenges in electronics, energy science and biomedicine. Recognitions she received include the World’s Top 100 Young Innovators, the Sloan Fellowship, DARPA Young Investigator Award, NIH New Innovator Award and the PECASE.

 

Selected Honors:

1.      Nano 50 Innovator Award, Nanotech Brief; 2006

2.      UCLA Henry Samueli School of Engineering and Applied Science Fellowship; 2006-2011

3.      International Union of Pure and Applied Chemistry Young Chemist Prize; 2004

4.      Honor Delegates to 43rd International Achievement Summit; 2004

5.      Lawrence Postdoctoral Fellowship, Lawrence Livermore National Laboratory;

6.      Technology Review World Top 100 Young Innovators Award; 2003

7.      Grand Prize Winner of Collegiate Inventors Competition; 2003

 

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