6 research outputs found
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