Day 1 :
- Nanomedicine
Session Introduction
Ahmed Raza Khan
Australian National University, Australia
Title: Tunable optoelectronic properties of ws2 by local Strain engineering and folding
Biography:
Ahmed Raza Khan is assiliated from Australian National University, Australia
Abstract:
Local-strain engineering is an exciting approach to tune the optoelectronic properties of materials and enhance the performance of devices. Two dimensional (2D) materials such as 2D transition metal dichalcogenides (TMDCs) are particularly well-suited for this purpose because they have high flexibility and can withstand high deformations before rupture. Wrinkles on thick TMDC layers have been reported to show the interesting photoluminescence enhancement due to bandgap modulation and funneling effect. However, the wrinkles in ultrathin TMDCs have not been investigated, because the wrinkles can easily fall down to form folds in these ultrathin layers of TMDCs. Here, we have achieved both wrinkle and fold nano-structures simultaneously on 1-3L WS2 using a new fabrication technique. The comparable layer dependent reduction in surface potential is observed for both folded layers and corresponding perfect pack layers due to the dominant interlayer screening effect. The strains produced from the wrinkle nanostructures considerably vary semi conductive junction properties. Thermo-ionic modelling suggests that the strained (1.6%) wrinkles can lower the Schottky barrier height (SBH) by 20%. The photo-generated carriers would further significantly lower the SBH. These results present an important advance towards controlling the optoelectronic properties of atomically thin WS2 using strain engineering, with important implications for practical device applications.
Ratih Dyah Pertiwi
Universitas Esa Unggul, Indonesia
Title: Bio-Synthesis of Gold Nanoparticles Using Muntingia Calabura, Linn And Assessment of Antioxidant Properties
Biography:
Ratih Dyah Pertiwi has completed his master from Universitas Indonesia and he was studying doctoral studies from Universitas Gajah Mada, faculty of Pharmacy. He is a lecturer of department Pharmacy, Universitas Esa Unggul, Jakarta, Indonesia.
Abstract:
The methods like biogreen are advantageous over chemical and physical methods due to eco friendly and cost-effective synthesis of nanoparticles. Current study was designed for green synthesis of gold nanoparticles (GNPs) and their biological evaluation. Aqua extract of Muntingia calabura, Linn was used for the synthesis of GNPs and confirmed by UV visible and Fourier Transform Infra-Red (FTIR) spectroscopy. Further field emission Transmision electron microscope (TEM) and Particle Size Analyser was used for the shape zeta potential and size determination. In vitro Antioxidant, and tyrosinase inhibitor was determined by using standard protocols. The nanoparticles were spherical in shape and having average particle size of 88 nm. FTIR analysis revealed the possible involvement of phyto-constituents in gold nanoparticles of crude extract. Green synthesized nanoparticles showed the enhanced antioxidant properties and the tyrosinase inhibitor. Green synthesized GNPs showed enhanced biological activities. Present results also support the advantages of using biogreen method for the production of nanoparticles having the potential of antimicrobial and cytotoxic activities.
Biography:
Anh Le Mong is going to study in Ms-PhD combined program at Sungkyunkwan University with corresponding by Professsor Dukjoon Kim, SKKU Fellow Professor at School of Chemical Engineering in Sungkyunkwan University National Academy of Engineering of Korea, Suwon, Gyeonggi 16419, Republic of Korea.
Abstract:
A series of alkaline anion exchange membranes (AAEMs) are synthesized from poly(arylene ether ketone)-poly(vinyl-1-butylimidazolium) graft copolymers (PAEK-g-[PBVIm-OH]) with different [PBVIm-OH] cationic chain lengths. The chemical structure of the synthesized polymers is confirmed by proton nuclear magnetic resonance (1H-NMR) and Fourier-transform infrared spectroscopy (FTIR) analysis. Several essential properties of AAEMs such as water uptake, hydroxide ion conductivity, and thermal, mechanical and dimensional stability for fuel cell applications are investigated and correlated to the ion cluster dimension examined by small-angle X-ray scattering (SAXS). The PAEK-g-[PBVIm-OH]-based AAEMs show excellent hydroxide ion conductivity as well as thermal, mechanical, and dimensional stability. The hydroxide ion conductivity increases with increasing PBVIm-OH graft chain length. The AAEM membrane with the longest PBVIm-OH chain length (MW of ~ 7000 g mol-1) exhibits the highest hydroxide conductivity of 0.00878 S cm-1 at 40 oC and the highest elongation of 206.7% in the hydrate state. The membrane electrode assembly fabricated from this membrane shows the highest power density of 22 mW cm-2 at a current density of 55 mA cm-2, which is very promising for fuel cell applications
Ting-Yu Lee
China University of Science and Technology, Taiwan
Title: Endothelial microRNA-10a is hemodynamics-regulated molecule to protect blood vessel from atherosclerosis
Biography:
Ting-Yu Lee has his expertise in vascular biology, hemodynamics-modulated endothelial dysfunction, epigenetic factors, histone deactylase, and miRNAs. He uses in vitro flow system to identify the role of miR-10a in hemodynamics-modulated EC function, and develop miR-10a as hemodynamics-based therapeutic components for atherosclerosis treatment