Conference Programme

The overview and detailed programme is posted below.

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Overview
Session
N-03: Symp N
Time:
Tuesday, 20/Jun/2017:
10:30am - 12:00pm

Session Chair: John Wang, National University of Singapore
Session Chair: Jerome Claverie, University of Sherbrooke
Location: Rm 304

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Presentations
10:30am - 11:00am
Invited

Combination of Photo-Induced Alignment and Self-Assembly to Realize Polarized Emission from Ordered Semiconductor Nanorods

Julian SCHNEIDER1, Abhishek K. SRIVASTAVA2, Vladimir G. CHIGRINOV2, Hoi Sing KWOK2, Andrey L. ROGACH1

1City University of Hong Kong, Hong Kong S.A.R. (China); 2Hong Kong University of Science and Technology, Hong Kong S.A.R. (China)

Semiconductor nanorods offer advantages of efficient light emitters of polarized light [1]; to ensure realization of this property on a macroscopic scale, reliable methods to align nanorods in parallel arrays are highly desirable. We developed an approach towards the large-scale arrangement of highly-emissive CdSe/CdS core-shell nanorods [2] based on photoalignment, which is a technology that is widely used in a liquid crystal molecular orientation [3]. The alignment is realised by employment of a multilayered thin film structure, consisting of sulfonic azo dye in the bottom layer and the nanorods embedded in a liquid crystal polymer matrix, forming the top layer. By irradiating the azo dye with a linear polarized blue light, these molecules align perpendicular, in-plane to the E-vector of the incoming light, and cause the alignment of the liquid crystal polymer and the nanorods by the interaction with nanorod’s surface ligands. The aligned nanorods show polarized emission with a maximum degree of polarization of 0.62 and an order parameter of 0.87. In order to highlight the advantages of this approach, nanorods are aligned in distinct patterns, which are realized by orthogonal alignment of azo dye in two illumination steps. Besides new opportunities for applications in liquid crystal displays, our alignment approach offers insights into host-guest interactions between colloidal nanorods and the molecular host matrix [2].

References:

[1] D. V. Talapin, R. Koeppe, S. Götzinger, A. Kornowski, J. M. Lupton, A. L. Rogach, O. Benson, J. Feldmann, H. Weller, NanoLett. 3, 1677 (2003)

[2] T. Du, J. Schneider, A. K. Srivastava, A. S. Susha, V. G. Chigrinov, H. S. Kwok, A. L. Rogach, ACS Nano 9, 11049 (2015).

[3] E. A. Shteyner, A. K. Srivastava, V. G. Chigrinov, H. S. Kwok, A. D. Afanasyev, Soft Matter 9, 5160 (2013).


11:00am - 11:30am
Invited

The Codes of Matter: A Simple Model for Design of New Class of Functional Materials

Xiaolin WANG

Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, Australia

This talk will present a number of new strategies we have developed for the design of new class of materials and properties. We will discuss how new electronic materials can be designed by shaping electronic band structures. A number of emerging electronic materials such as topological insulators, Weyl metals, spin gapless semiconductors (SGSs) with exotic band structures, Dirac type system or topological Dirac system will be reviewed briefly. How to achieve dissipationless transport in these system will be presented these system. Furthermore, the ultimate questions in material and property’s design are raised: 1) How many new (electronic) materials or new (electronic) properties are still there? 2) What are they? 3) How to create them? A very simple model, the codes of matter/materials, based on the three ubiquitous and paramount attributes of all existing matter/materials, charge (Q), spin (S), and moment (K) will be introduced. We will introduce a new periodic table which consists of all codes responsible for physical properties. We will discuss the principles of the codes and how to use the new table of element of properties to design new materials and properties. Many new types of exotic physical states and their possible experimental realizations will be discussed. Some typical examples in chemistry such as new superhydrophobic effect in novel systems will be given.


11:30am - 11:45am
Oral

Electrical Conductive Al2O3-TiN Composite Fabricated via Ti Reactive Sintering Process and the Influence of Ti Particles Size and Concentration

Wei ZHAI1, Bingxue YU2, Tao LI1, Wanheng LU2, Xu SONG1, Kaiyang ZENG2

1Singapore Institute of Manufacturing Technology, Agency for Science, Technology and Research (A*STAR), Singapore; 2Department of Mechanical Engineering, National University of Singapore, Singapore

Alumina has been known as one of the most economical and widely used ceramic materials owning to its high hardness, high temperature, corrosion and wear resistance. However, its widespread applications are limited by its brittleness. TiN reinforced alumina has been studied for years as an effective way to improve the mechanical properties and electrical conductivity of alumina for its applications in corrosion resistant electrodes, water filtration membranes and sensing elements. In this work, Al2O3-TiN composites were fabricated via Ti reactive sintering process with various particle size (15, 37, 45, 74 um) and concentration (3, 5, 10, 15, 20 vol %). The influence of particle size and concentration on the microstructural, electrical and mechanical properties has been studied via SEM, C-AFM, XRD, indentation test, etc. The percolation theory has been applied and well-studied in this work. The optimum choice of Ti concentration and particle size will be selected to produce Al2O3-TiN composite product prototype using 3D printing.


11:45am - 12:00pm
Oral

Electrospinning-derived Nanohybrids for Energy Storage/Harvest Applications

Junhua KONG1, Chaobin HE1, Xuehong LU2

1Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), Singapore; 2School of Materials Science and Engineering, Nanyang Technological University, Singapore

Electrospinning is a powerful technique to produce polymeric nanofibers due to the advantages of mass production, size and composition controllability, as well as morphologies and structures tailoring capability. Polymer nanofibers can also be facilely converted into carbon nanofibers via simple annealing process, adding rich diversity to their further applications. In this talk, the nanohybrids that obtained from electrospinning and the subsequent processes, for the applications of energy storage and harvest, will be discussed. The details include a brief of electrispinning, the tailoring of polymer nanofibers and its derived nanohybrids that can be achieved, the electrochemical properties and their correlation to the corresponding morphologies and structures.


12:00pm - 12:15pm
Oral

Engineering Nanoporous Materials for Enhanced Greenhouse Gas Capture

Chong Yang CHUAH1, Tae-Hyun BAE1,2

1School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore; 2Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, Singapore

Extensive research on greenhouse gas capture have been conducted in view of the rising concerns of global warming phenomena. Aqueous alkanolamine and liquefaction process which had been utilized industrially to remove CO2 and SF6 respectively are considerably energy intensive and larger plant footprint. Therefore, alternatives to alleviate the problems in effective removal of greenhouse gases are required. In general, adsorptive-based separation displays its promising behavior in overcoming the aforementioned limitation, nonetheless detailed studies and analyses are required so as to assure its practicability in industrial process.

Zeolites and metal-organic frameworks (MOFs) are the most commonly studied adsorbents due to its ease of synthesis as well as favorable SF6 and CO2 capture. However, the study of adsorbents in SF6 capture is still limited despite its higher global warming potential and atmospheric lifetime than CO2. Besides, owing to its larger kinetic diameter as compared to CO2, SF6 uptake kinetics is critical due to a longer equilibration time can be expected particularly if the available pores are limited. In this study, adsorbents with both microporous and mesoporous domains had been synthesized so as to allow strong facilitation on the SF6 molecules on the surface of adsorbents together with strong improvement in the adsorption kinetics.

Besides, detailed study on the adsorbents in post-combustion carbon capture will be evaluated. Adsorbents in general though possess high CO2 capture together with high CO2/N2 selectivity. However, majority of the studies conducted are only based on pure CO2 and N2 isotherms. As such, the behavior of adsorbents in the presence of water molecules, which is commonly observed in actual gas stream is often neglected. Therefore, adsorption-desorption cycling of adsorbents in humid condition is studied so as to ensure the adsorbents recyclability in the presence of water that generally shows higher binding energy than CO2.



 
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