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Fan K.,Hwa Chong Institution | Huang W.M.,Nanyang Technological University | Wang C.C.,Nanyang Technological University | Ding Z.,Nanyang Technological University | And 4 more authors.
Express Polymer Letters | Year: 2011

Shape memory materials are featured by their ability to recover their original shapes when a particular stimulus, such as heat, light, magnetic field, even moisture/water, etc. is applied. However, it is not an easy task for non-professionals to synthesize a shape memory material which can meet all the requirements of a particular application. Even for professionals, like materials researchers, it could involve tedious trial and error procedures. In this paper, the concept of water-responsive shape memory hybrid is proposed and the advantages are demonstrated by two examples. The hybrid concept is versatile and can be easily accessed by those even without much polymer/chemistry background. Moreover, the performance of such hybrids can be well-predicted. This concept can be further extended into solvent-responsive shape memory hybrids, which can be routinely designed and realized in a Do-It-Yourself manner by almost anyone. © BME-PT.


Li X.D.,Nanyang Technological University | Chen S.,Hwa Chong Institution | Chen T.P.,Nanyang Technological University | Liu Y.,University of Electronic Science and Technology of China
ECS Solid State Letters | Year: 2015

Dielectric function of amorphous indium gallium zinc oxide (a-IGZO) thin films is found to shift significantly with the film thickness, which is attributed to the changes in both the bandgap and electron concentration of the IGZO thin films with the film thickness. The ultrathin films (film thickness < ∼20 nm) exhibit a bandgap expansion with reducing film thickness due to the quantum confinement effect; while the thicker films (thickness > ∼35 nm) demonstrate the free-electron effect, i.e. the Burstein-Moss shift and increase of free-electrons absorption with increasing electron concentration © 2015 The Electrochemical Society.


Thepsuparungsikul N.,Silpakorn University | Ng T.C.,Hwa Chong Institution | Lefebvre O.,National University of Singapore | Ng H.Y.,National University of Singapore
Water Science and Technology | Year: 2014

The microbial fuel cell (MFC) is an innovative technology for producing electricity directly from biodegradable organic matter using bacteria. Among all the influenceable factors, anode materials play a crucial role in electricity generation. Recently, carbon nanotubes (CNTs) have exhibited promising properties as electrode material due to their unique structural, and physical and chemical properties. In this study, the impacts of CNT types in CNT-based anodes were investigated to determine their effect on both efficiency of wastewater treatment and power generation. The CNTs, namely single-walled CNT with carboxyl group (SWCNT), multi-walled CNT with carboxyl group (MWCNT-COOH) and multi-walled CNT with hydroxyl group (MWCNT-OH) were used to fabricate CNT-based anodes by a filtration method. Overall, MWCNTs provided better results than SWCNTs, especially in the presence of the -OH groups. The highest power and treatment efficiencies in MFC were achieved with an anode made of MWCNT-OH filtered on Poreflon membrane; the open circuit voltage attained was 0.75 V and the maximum power density averaged 167 mW/m2, which was 130% higher than that obtained with plain carbon cloth. In addition, MWCNT-OH is more cost-effective, further suggesting its potential to replace plain carbon cloth generally used for the MFC anode. © IWA Publishing 2014.


Yip C.-W.,Hwa Chong Institution
American Biology Teacher | Year: 2010

I describe a 5-day basic microbiology enrichment course for high school students. In this course, students learn microbiological techniques such as preparation of agar plates, isolation of bacteria from food, serial dilution, and plating. Additionally, they experience the steps involved in the identification of an unknown bacterium and learn about the modes of action of common antibiotics against different types of bacteria. Feedback indicates that this course provided invaluable lessons and experiences for students who had no prior hands-on experience with microorganisms. © 2010 by National Association of Biology Teachers.


Tan Y.L.K.,Hwa Chong Institution | Leong W.K.,Nanyang Technological University
Journal of Organometallic Chemistry | Year: 2011

Reaction of the heteronuclear cluster RuOs3(μ-H) 2(CO)13 (1) with azulene under thermal activation afforded the novel clusters RuOs3(μ-H)(CO)9(μ3, η5:η2:η2-C10H 9) (3) and Ru2Os3(μ-H)2(CO) 13(μ-CO)(μ3,η5:σ2- C10H8) (5a), with 4,6,8-trimethylazulene to give RuOs 3(μ-H)(CO)8(μ-CO)(μ,η5: η4-C10H6Me3) (4) and Ru 2Os3(μ-H)2(CO)13(μ-CO) (μ3,η5:σ2-C10H 5Me3) (5b), and with guaiazulene to give Ru 2Os3(CO)11(μ3,η5: η3:η3-C10H5Me 2iPr) (6), respectively. In 3-5, cluster-to-ligand hydrogen transfer appears to have taken place, with the organic moiety capping a trimetallic face in 3, bridging a metal-metal bond in 4 and via a μ3,η5:σ2 bonding mode in 5a and 5b. Cluster 6 contains a trigonal bipyramidal metal framework with the guaiazulene ligand over a triangular metal face. All five clusters have been completely characterised, including by single-crystal X-ray diffraction analysis. © 2011 Elsevier B.V. All rights reserved.

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