ORCID Profile
0000-0002-9043-1781
Current Organisations
Hong Kong Polytechnic University
,
The Hong Kong Polytechnic University
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Publisher: SAGE Publications
Date: 04-02-2022
DOI: 10.1177/15280837211073359
Abstract: A novel spacer fabric with a weft-knitted structure of silicone tube and foam inlays is proposed for use in insoles to alleviate in-shoe pressure, reduce moisture and enhance thermal comfort. The material variables, including the diameter of the spacer yarn, type of inlaid material and net wrap and spacer pattern have been systematically investigated. Their force reduction and thermal characteristics in terms of air and water vapour permeabilities, thermal conductivity and impact force reduction are determined and compared to those of traditional insole materials. The results show that the inlays can effectively enhance the impact force reduction of the 3D spacer fabrics. In comparison to traditional insole materials, the proposed spacer fabric with an inlaid structure can enhance air and moisture permeabilities and heat dissipation to provide greater wear comfort for prolonged use. The air permeability, thermal conductivity and impact force reduction of the inlaid spacer structure can be modified with changes to the diameter of the spacer yarn, type of inlay and net material used and spacer pattern, whilst its water vapour permeability can also be varied by using different types of inlays. Spacer fabric with a higher number of spacer yarn courses and spacer yarn with a large diameter not only exhibits good impact force reduction with uniform thickness, but also offers good thermal conductivity. The findings of this study will contribute toward an insole design with the use of alternative insole materials for optimal foot protection.
Publisher: Springer Science and Business Media LLC
Date: 07-2005
Publisher: Springer Science and Business Media LLC
Date: 26-11-2003
Publisher: Emerald
Date: 09-10-2007
DOI: 10.1108/09556220710819519
Abstract: The purpose of this paper is to present anthropometric measurements on 42 premature infants nursed in the neonatal intensive care unit of Queen Mary Hospital, Hong Kong. Birth information, including maturity, age, gender, birth weight and present weight, were recorded. About 13 body size measurements, including stature, hand girth, armscye girth, chest girth, arm length, max girth, abdomen girth, hand length, thigh girth, shoulder width, head to nape length, inside leg to heel length and foot length, were measured for each infant. Using these data, the body size distribution, the correlation between each body size measurement, and linear regressions of present weight and stature with other body size measurement were analyzed. It was found that present weight and stature of premature infants were the most desirable and significant size parameters for the development of a measurement chart for premature infants. The paper provides anthropometric measurement details of premature infants.
Publisher: Elsevier BV
Date: 2005
DOI: 10.1016/J.JCIS.2004.08.046
Abstract: Microencapsulated n-alkanes (n-octadecane, n-nonadecane, and n-eicosane) were synthesized by in situ polymerization using urea-melamine-formaldehyde polymer as shells. Microcapsules 5.0 and 10.0 wt% of 1-tetradecanol, paraffin, and 1-octadecanol were used as nucleating agents. The fabrication was characterized using Fourier transform infrared, light microscopy, and scanning electron microscopy. The crystallization and prevention of supercooling of the microcapsules are studied using differential scanning calorimetry (DSC) and wide-angle X-ray diffraction. The crystal system of the microencapsulated n-alkane is the same as that of the bulk. The enthalpies of the microcapsules containing 70 wt% n-alkanes are approximately 160 J/g. The melting temperature of the n-alkanes in the microcapsule is the same as that in the bulk. There are multiple peaks on the DSC cooling curves that are attributed to liquid-rotator, rotator-crystal, and liquid-crystal transitions. The DSC cooling behavior of microencapsulated n-octadecane is affected by the average diameters. The measured maximum degree of supercooling of the microencapsulated n-octadecane is approximately 26.0 degrees C at a heating and cooling rate of 10.0 degrees C/min. The degree of supercooling of microencapsulated n-octadecane is decreased by adding 10.0 wt% of 1-octadecanol as a nucleating agent.
Publisher: Wiley
Date: 22-04-2005
DOI: 10.1002/APP.21760
Publisher: Elsevier BV
Date: 12-2004
Publisher: SAGE Publications
Date: 05-2006
Abstract: Thermo-regulated polyacrylonitrilevinylidene chloride (PAN/VDC) fibers containing 4-40 wt.% of micro phase-change materials (microPCMs) were wet-spun. In this study, fibers containing less than 30 wt.% of microencapsulated n-octadecane were spun smoothly. The structures and properties of the fibers were investigated by using Fourier transform infrared, scanning electron microscopy, differential scanning calorimetry, wide-angle X-ray diffraction, dynamic mechanical analysis and thermogravimetric analysis, etc. The microcapsules were intact and evenly distributed inside the polymer matrix. The tensile strengths of the fibers with titers in the range of 1.9 to 10.9 dtex were 0.7 to 2.0 cN/dtex. The elongation of the fibers was approximately 7%. The heat-absorbing and heat-evolving temperatures of the fibers increased slightly with the increase of the content of microPCMs. The enthalpy of melting or enthalpy of crystallization of the fiber containing 30 wt.% of microPCMs was approximately 30 J/g, and the enthalpy of melting or enthalpy of crystallization increased steadily as the content of microPCMs increased. The modulus of the fiber decreased with the increase in the amount of microPCMs in the fiber. The glass transition temperature of the fiber was 89-108°C which decreased with the increase of the content of microPCMs, and the melting and decomposing temperatures of the fiber were approximately 190 and 220°C, respectively. The fibers had a limited oxygen index value that was higher than 25% and were permanently in flame retardation.
No related grants have been discovered for Kit Lun Yick.