ORCID Profile
0000-0001-8872-3032
Current Organisation
Nanyang Technological University
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Publisher: Elsevier BV
Date: 08-2000
Publisher: AIP Publishing
Date: 04-2011
DOI: 10.1063/1.3581217
Abstract: Microlens-ended fibers, which have found tremendous interest in the recent past, find potential biomedical applications, in particular, in endoscopic imaging. The work presented in this paper focuses on the stand-alone microlenses along with custom-fabricated specialty optical fiber, such as imaging fiber, for probe imaging applications. Stand-alone self-aligned microlenses have been fabricated employing microcompression molding and then attached at the end facet of imaging fiber. A detailed characterization of the fabricated microlens is carried and it demonstrates appropriate focusing ability, high fluorescence collection efficiency and imaging ability for biomedical applications. The surface roughness of the microlens is found to be 25 nm with a minimum spot size of 38 μm. The probe imaging system is found to be able to image the fluorescence microspheres of 10 μm size. The collection efficiency of the fiber probe with lens found to be enhanced by three times approximately.
Publisher: Elsevier BV
Date: 06-2001
DOI: 10.1016/S0142-9612(00)00272-6
Abstract: Hydroxyapatite-coated titanium alloy composite powders (Ti-6Al-4V/HA) was produced by a ceramic slurry approach. The aim was to evaluate the stability of the coating when subjected to a physiological medium simulated body fluid (SBF). Three consolidation conditions (700 degrees C for 5 h, 700 degrees C for 8 h and 700 degrees C for 11 h) were used in the production of the Ti-6Al-4V/HA composite powders. Results showed that biodissolution followed by apatite precipitation had taken place after soaking in SBF. In addition, it was found that consolidation at 700 degrees C for 5 h resulted in a weak mechanical locking of calcium phosphate on the Ti-6Al-4V surfaces and the formation of small crystallites, which would increase the dissolution rate.
Publisher: Elsevier BV
Date: 10-2002
Publisher: Elsevier BV
Date: 2001
Publisher: Elsevier BV
Date: 07-2002
DOI: 10.1016/S0142-9612(01)00422-7
Abstract: Taguchi method with an L9 orthogonal array was employed to investigate the sintered properties of Ti-6Al-4V/HA tensile bars produced by powder injection molding. The effects of sintering factors at the 90% significance level: sintering temperature (1050 degrees C, 1100 degrees C and 1150 degrees C), heating rate (5 degrees C/min, 7.5 degrees C/min and 10 degrees C/min), holding time (30, 45 and 60 min) and cooling rate (5 degrees C/min, 20 degrees C/min and 40 degrees C/min) were investigated. Results showed that sintering temperature, heating rate and cooling rate have significant effects on sintered properties, whereas the influence of holding time was insignificant. It was found that a sintering temperature of 1100 degrees C, a heating rate of 7.5 degrees C/min and a cooling rate of 5 degrees C/min increased the relative density, Vicker's microhardness, flexural strength and flexural modulus. However, a further increment of sintering temperature to 1150 degrees C did not show any discernable improvement in the relative density and Vicker's microhardness, but there was a slight increase of 0.6% and 0.9% in the flexural strength and flexural modulus, respectively. Mechanically strong Ti-6Al-4V/HA parts with an open porosity of around 50% were developed.
Publisher: Elsevier BV
Date: 11-2000
Publisher: Elsevier BV
Date: 11-2002
Publisher: Elsevier BV
Date: 2002
DOI: 10.1016/S0142-9612(01)00076-X
Abstract: Dense hydroxyapatite (HA) compacts have been successfully fabricated by a spark plasma sintering (SPS). The sintering behavior of HA powders at different temperatures ranging from 850 degrees C to 1100 degrees C was studied. Results showed that spark plasma sintering resulted in rapid densification to near theoretical density. The HA compact was homogeneously sintered at 950 degrees C in a short sintering duration of 5 min, while maintaining high quality and high relative density (>99.5%). The density, microhardness and Young's modulus of HA sintered compact initially increased with the sintering temperature, reached a maximum value at around 950-1000 degrees C, then decreased with further increase in the temperature due to the decomposition of HA into beta-tricalcium phosphates. Fracture toughness results showed no significant difference with increasing temperature due to the combined influences of density and grain size. Microstructure analysis showed no noticeable grain growth under different sintering temperatures due to the short time exposure at high temperatures.
Publisher: Springer Science and Business Media LLC
Date: 09-2003
Publisher: Elsevier BV
Date: 02-2002
Publisher: Elsevier BV
Date: 11-2000
Publisher: Springer Science and Business Media LLC
Date: 29-04-2002
Publisher: Elsevier BV
Date: 03-2001
Publisher: Elsevier BV
Date: 04-2001
Publisher: Wiley
Date: 23-07-2010
DOI: 10.1002/PEN.21738
Publisher: Springer Science and Business Media LLC
Date: 04-2016
Publisher: Springer Science and Business Media LLC
Date: 2003
Publisher: Elsevier BV
Date: 09-2002
Publisher: Elsevier BV
Date: 07-2001
Publisher: Elsevier BV
Date: 02-2011
Publisher: Informa UK Limited
Date: 2002
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C4LC01139B
Abstract: We report a new technology using acoustofluidic to achieve controllable manipulation of the size of the bubbles formed.
Publisher: IOP Publishing
Date: 18-08-2009
Publisher: Wiley
Date: 2002
DOI: 10.1002/JBM.10082
Abstract: This article reports the morphology and mechanical properties of sintered powder injection molded Ti-6Al-4V/HA parts in a simulated physiological environment. Sintered Ti-6Al-4V/HA parts were immersed in a simulated body fluid (SBF) with ion concentrations that were comparable to those of human blood plasma for a total period of 12 weeks. At intervals of 2 weeks, the immersed Ti-6Al-4V/HA parts were analyzed with the use of scanning electron microscopy (SEM), X-ray diffractometry (XRD), and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). Mechanical properties such as flexural strength, flexural modulus, compressive strength, and compressive modulus were also evaluated. Results showed that complete dissolution of the more soluble phases such as tricalcium phosphate (TCP), tetracalcium phosphate (TTCP), and calcium oxide (CaO) were found after 2 weeks of immersion in SBF. ICP analysis showed that high calcium concentration release of around 200 ppm was observed in the SBF solution after 2-4 weeks of immersion, indicating that dissolution has taken place. Next, a gradual decrease in calcium concentration release in the SBF solution was observed after immersion for 4-6 weeks, with increasing amounts of calcium phosphate precipitates being observed on the Ti-6Al-4V/HA surface. Mechanical properties such as strength and modulus were found to deteriorate during 2-4 weeks of immersion, followed by gradual increment as the immersion period increased. This study also showed that parts sintered at 1150 C exhibited faster dissolution and precipitation rates than parts sintered at 1050 C in a physiological environment.
Publisher: Elsevier BV
Date: 07-2001
Publisher: Elsevier BV
Date: 2001
Publisher: Informa UK Limited
Date: 2001
Publisher: Springer Science and Business Media LLC
Date: 2001
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5LC01012H
Abstract: This review presents the state of the art of active microfluidic droplet generation concepts.
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Shu Beng Tor.