SINGAPORE'S FUTURE ENERGY OPTIONS - KEY CHALLENGES

Bachelor'sBACHELOR OF SCIENCE (REAL ESTATE

Investigation of nano-porous silicon fabricated by electrochemical etching

72 p.Porous silicon is quickly becoming an increasingly important and versatile electronic material in today's fabrication technology. Nowadays, because of its high reactivity due to its large surface area of the pores, porous silicon has been demonstrated as a useful sacrificial layer in surface micro machining. It's unique morphology made it an attractive material for the fabrication of the chemical sensing microstructures. It is also being use as planar emitters for efficient emission of electrons. In addition, porous silicon serves as a good substrate material for both the carbon nanotube material for the enhancement of the field emission property.Master of Science (Microelectronics

Room temperature sequential ionic deposition (SID) of Ag2S nanoparticles on TiO2 hierarchical spheres for enhanced catalytic efficiency

10.1039/c4ta06674jJournal of Materials Chemistry A3126509-651

Multicomponent (Ce, Cu, Ni) oxides with cage and core-shell structures: Tunable fabrication and enhanced CO oxidation activity

© 2016 The Royal Society of Chemistry.Solvothermal synthesis of Cu2O cubes from Cu(OAc)2 in ethanol provided templates for tunable formation of novel multicomponent composites: hollow CeO2-Cu2O (1), core-shell NiO@Cu2O (2) and hollow CeO2-NiO-Cu2O (3). Composites 1-3 catalyze the oxidation of CO at a lower temperature than the parent Cu2O cubes.Link_to_subscribed_fulltex

Parallel Control over Surface Charge and Wettability Using Polyelectrolyte Architecture: Effect on Protein Adsorption and Cell Adhesion

Surface charge and wettability, the two prominent physical factors governing protein adsorption and cell adhesion, have been extensively investigated in the literature. However, a comparison between these driving forces in terms of their independent and cooperative effects in affecting adhesion is rarely explored on a systematic and quantitative level. Herein, we formulate a protocol that features two-dimensional control over both surface charge and wettability with limited cross-parameter influence. This strategy is implemented by controlling both the polyion charge density in the layer-by-layer (LbL) assembly process and the polyion side-chain chemical structures. The 2D property matrix spans surface isoelectric points ranging from 5 to 9 and water contact angles from 35 to 70°, with other interferential factors (e.g., roughness) eliminated. The interplay between these two surface variables influences protein (bovine serum albumin, lysozyme) adsorption and 3T3 fibroblast cell adhesion. For proteins, we observe the presence of thresholds for surface wettability and electrostatic driving forces necessary to affect adhesion. Beyond these thresholds, the individual effects of electrostatic forces and wettability are observed. For fibroblast, both surface charge and wettability have an effect on its adhesion. The combined effects of positive charge and hydrophilicity lead to the highest cell adhesion, whereas negative charge and hydrophobicity lead to the lowest cell adhesion. Our design strategy can potentially form the basis for studying the distinct behaviors of electrostatic force or wettability driven interfacial phenomena and serve as a reference in future studies assessing protein adsorption and cell adhesion to surfaces with known charge and wettability within the property range studied here