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664 results on '"Boey, Freddy"'

203. Polyphenylene Dendrimer‐Templated In Situ Construction of Inorganic–Organic Hybrid Rice‐Shaped Architectures

Author

Qi, Xiaoying, primary, Xue, Can, additional, Huang, Xiao, additional, Huang, Yizhong, additional, Zhou, Xiaozhu, additional, Li, Hai, additional, Liu, Daojun, additional, Boey, Freddy, additional, Yan, Qingyu, additional, Huang, Wei, additional, De Feyter, Steven, additional, Müllen, Klaus, additional, and Zhang, Hua, additional

Published
2009
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229. Cover Picture: Small 8/2008

Author

Zhang, Juan, primary, Wang, Lihua, additional, Pan, Dun, additional, Song, Shiping, additional, Boey, Freddy Y. C., additional, Zhang, Hua, additional, and Fan, Chunhai, additional

Published
2008
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237. Development of a fibre composite process for producing prototype engineering components

Author

Boey, Freddy Yin Chiang. and School of Mechanical and Production Engineering

Subjects
Engineering::Materials::Composite materials [DRNTU]
Abstract

180 p. Fibre reinforced composite (FRC) materials have proved themselves to be one of the few non conventional engineering materials critical to the advance in technology today. It has become necessary for tertiary institutions like NTI to include both the research and training on the design, analysis and process of these materials in their curriculum. RP 25/988

Published
1991

243. Ag–Ag2S Hybrid Nanoprisms: Structural versusPlasmonic Evolution

Author

Shahjamali, Mohammad M., Zhou, Yong, Zaraee, Negin, Xue, Can, Wu, Jinsong, Large, Nicolas, McGuirk, C. Michael, Boey, Freddy, Dravid, Vinayak, Cui, Zhifeng, Schatz, George C., and Mirkin, Chad A.

Abstract

Recently, Ag–Ag2S hybrid nanostructures have attracted a great deal of attention due to their enhanced chemical and thermal stability, in addition to their morphology- and composition-dependent tunable local surface plasmon resonances. Although Ag–Ag2S nanostructures can be synthesized viasulfidation of as-prepared anisotropic Ag nanoparticles, this process is poorly understood, often leading to materials with anomalous compositions, sizes, and shapes and, consequently, optical properties. In this work, we use theory and experiment to investigate the structural and plasmonic evolution of Ag–Ag2S nanoprisms during the sulfidation of Ag precursors. The previously observed red-shifted extinction of the Ag–Ag2S hybrid nanoprism as sulfidation occurs contradicts theoretical predictions, indicating that the reaction does not just occur at the prism tips as previously speculated. Our experiments show that sulfidation can induce either blue or red shifts in the extinction of the dipole plasmon mode, depending on reaction conditions. By elucidating the correlation with the final structure and morphology of the synthesized Ag–Ag2S nanoprisms, we find that, depending on the reaction conditions, sulfidation occurs on the prism tips and/or the (111) surfaces, leading to a core(Ag)–anisotropic shell(Ag2S) prism nanostructure. Additionally, we demonstrate that the direction of the shift in the dipole plasmon is a function of the relative amounts of Ag2S at the prism tips and Ag2S shell thickness around the prism.

Published
2016
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246. Characterization of a bioactive fiber scaffold with entrapped HUVECs in coaxial electrospun core-shell fiber.

Author

Hui Ying Ang, Irvine, Scott Alexander, Avrahami, Ron, Sarig, Udi, Bronshtein, Tomer, Zussman, Eyal, Yin Chiang Boey, Freddy, Machluf, Marcelle, and Venkatraman, Subbu S.

Subjects
ENDOTHELIAL cells, UMBILICAL veins, TISSUE scaffolds, CYTOLOGICAL research, MOLECULAR biology
Abstract

Human umbilical vein endothelial cells (HUVECs) were successfully entrapped in polyethylene oxide (PEO) core / polycaprolactone (PCL) shell electrospun fibers thus creating a "bioactive fiber." The viability and release of biomolecules from the entrapped cells in the bioactive fibers were characterized. A key modification to the core solution was the inclusion of 50% fetal bovine serum (FBS), which improved cell viability substantially. The fluorescein diacetate (FDA) staining revealed that the entrapped cells were intact and viable immediately after the electrospinning process. A long-term cell viability assay using AlamarBlue® showed that cells were viable for over two weeks. Secreted Interleukin-8 (IL-8) was monitored as a candidate released protein, which can also act as an indicator of HUVEC stress. These results demonstrated that HUVECs could be entrapped within the electrospun scaffold with the potential of controllable cell deposition and the creation of a bioactive fibrous scaffold with extended functionality. [ABSTRACT FROM AUTHOR]

Published
2014
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249. Increasing solvent polarity and addition of salts promote β-phase poly(vinylidene fluoride) formation.

Author

Low, Yuen Kei Adarina, Tan, Li Yi, Tan, Lay Poh, Boey, Freddy Yin Chiang, and Ng, Kee Woei

Subjects
POLARITY (Chemistry), POLYVINYLIDENE fluoride, FOURIER transform infrared spectroscopy, DIFFERENTIAL scanning calorimetry, POLAR solvents, BIOMATERIALS
Abstract

This article investigates the effects of solvent polarity and salt addition on β-phase poly(vinylidene fluoride) (PVDF) formation. Films were solvent cast in aprotic solvents of varying polarities with or without salt addition. Characterization was done by Fourier transformed infra-red spectroscopy, differential scanning calorimetry, and scanning electron microscopy. Decreasing fractions of β-phase PVDF was observed with increasing drying temperature when less polar solvents were used. The most polar solvent (hexamethylphosphoramide) consistently produced films with at least 90.0% β-phase PVDF within the crystalline regions. Melting temperatures increased in correlation to absolute proportions of β-phase PVDF. Salt addition increased the formation of β-phase PVDF by 30%, with salts of higher valencies and smaller ionic radii resulting in more significant increases. Taken collectively, using solvents of higher polarities and addition of salts with high cationic valencies and small ionic radii will maximize β-phase formation in solvent cast PVDF films. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013 [ABSTRACT FROM AUTHOR]

Published
2013
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