Papers by Author: Jia Horng Lin

Abstract: It is well known that titanium (Ti) has excellent properties of anticorrosion, biocompatibility and low modulus that would be applied in many clinical applications. The aim of this study wants to increase the hydrophilicity of titanium surface through silanization and then grafted with hydroxyapatite (HA) by hydrothermal synthesis method. Physiochemical analysis of grafting plate substrate was observed by attenuated total reflection-Fourier transform infrared spectroscopy (ATR-FTIR), scanning electron microscopy (SEM), and contact angle analysis. The surfaces with silanization were strongly interaction between SiO₂ and TiO₂, and thus Ti-O-Si-bonds formed having larger surface areas but only showed a little improved hydrophilicity. The hydrophilicity of Ti substrate was largely increased after the hydrothermal process. Compared with Ti surface without any surface treatment, the surface which modified with hydrothermal synthesis can improve the wettability of Ti surfaces. Furthermore, the Ti surface through silanized modification before hydrothermal synthesis held good calcium phosphate precipitates existing due to the better calcium ion combined ability with polar bond of aldehyde group (Ti-O-Si-CO^-).

Abstract: Graphene nanosheets (GNSs) with different oxygen contents crucially affect the performance of polymer composites. In this study, we compared GNSs prepared from graphite oxide (GO) using three different concentrations of potassium permanganate and thermal reduction of GO at 1050 °C. The structural properties of GO and GNSs were investigated by Fourier transform infrared spectroscopy and Raman spectroscopy. Moreover, an effective coagulation method was used to prepare poly (trimethylene terephthalate) (PTT) composites filled with well-dispersed GNSs by selecting suitable solvents for solution blending. The electrical properties of PTT/GNSs were investigated to reveal the effect of oxygen content of GNSs.

Abstract: With the advancement of nanotechnology and material chemistry, micelles have emerged as one of the most attractive carriers for anticancer drug delivery. In this study, a newly developed polymerization technique termed as “sequential ring-opening polymerization (SROP)“ was used to synthesize poly (ethylene glycol)-block-polylactide-block-polylactide (PEG-PLA-PLAs). Utilizing the features of SROP, well-controlled chain length of two different PLA blocks by using PEG as initiator can be achieved. Two types of PEG-PLA-PLAs, PEG-PLA₁₁-PLA₁₁ and PEG-PLA₁₈-PLA₁₈, were successfully synthesized and characterized. Having amphiphilic properties, PEG-PLA-PLAs were used to form micelles through self-assembly. The effects of PLA length on the resultant micelles were thoroughly investigated.

Abstract: This proposal aims to develop a newly, stable, excellent and environmental process of manufacturing scaffolds with virtually identical biphasic calcium phosphate compositions. Calcium phosphate cements (CPCs), which combines calcium orthophosphate powders with a liquid leading to a paste that hardens spontaneously at low temperatures, have potential to be used as a porous template for dental bone grafting substitutes [1,2]. Such newly developed sintering processes having the bone grafts with properties of bioactivity or even bioresorbability would be applied in many clinical setting. Template materials combine calcium orthophosphate powders with a liquid leading to a paste that hardens spontaneously at low temperatures. Hence, CPCs could be applied as scaffolds to support cell/tissue growth [3, 4]. This paper studies CPC scaffolds processing by foaming cement's paste state in which was added phasic stabilizer of magnesia and foaming agent of sucrose. The X-ray diffraction was performed to identify the phases of bone grafting substitutes, and we also used scanning electron microscope to observe the structure and pores of bone grafting substitutes. The cell viability about biocompatibility of developed bone grafting substitutes was examined. The results showed that our bone grafting substitutes produced steady final biphasic products consisting of hydroxyapatite (HA) and beta-tricalcium phosphates (β-TCP). We observed interconnected pores and highly porosity in microstructure of the bone grafting substitutes. The cell viability was over 70 % to make sure that the bone grafting substitutes has excellent biocompatibility. In conclusion, using the slurry of calcium phosphate cements (CPCs) and pores forming agent set into a porous template would be a useful process for manufacturing bone graft substitutes.

Abstract: In the research, The electromagnetic interferences (EMI) have drastically increased and can disrupt and reduce the life time and the efficiency of devices. Therefore, the electromagnetic shielding problem is become the important issue. In the research, Ni wire and Cu wire (Floodlit Enterprise Co., Ltd.) were used to make the Ni conductive composite yarn and Cu conductive composite yarn via an electrical covering machine. And the Cu conductive composite yarn was fabricated to the woven fabrics with the plain weaving. The test results revealed that the EMSE of the W/K/W complex fabrics have stable EMSE than the W/W/W complex fabrics when the laminated at the same direction. The W/90W/W complex woven fabrics were shown the best EMSE of 46.25 dB, which the test frequency is 1800 MHz.

Abstract: Conductive textiles can be used in diverse fields, such as antistatic materials, sensors, materials for electromagnetic shielding and biomedical. This study produces nonwoven fabrics with polylactic acid (PLA) and polyaniline (PAN) and the resulting PLA/PAN nonwoven fabrics are evaluated with electromagnetic shielding effectiveness (EMSE) and air permeability. Polylactic acid (PLA) and low melting point polylactic acid (LPLA) are made into nonwoven fabrics, which are then spray-coated with different amount of PAN solution to form PLA/PAN nonwoven fabrics. The fabrics are laminated with various numbers of layers, and then thermally pressed. The experiment results show that the PAN amount and lamination number are proportional to the EMSE of the PLA/PAN nonwoven fabrics.

Abstract: In recent years, as global technical progress grows, many mechanized machines are developed continuously. Mechanization has substituted for manpower in many factories for promotion of production efficiency, leading to mechanical noise happening more severely. If people are subjected to noise pollution for long term, they would happen dysphoria and absent mindedness, resulting in accident occurrence. Therefore, how to effectively reduce noise pollution becomes an urgent subject. Moreover, rapid population development and fast-growth economy raise consumption in every country, driving industry into high-production and high-consumption times and meanwhile generating much of wastes. In order to achieve sustainable development, these wastes should be recycled effectively. Therefore, 20 wt% recycled PET fibers were added in this study. This paper mainly used 3D and 15D Nylon fibers (70, 60, 50, 40, 30 wt%), low-melting PET fibers (10, 20, 30, 40, 50 wt%) and 20 wt% high-strength PET fibers, to fabricate Nylon 6/Low melting PET/ Recycled high-strength PET nonwoven via needle-punching process. After that, tensile strength, air permeability and sound absorption coefficient property of resulting nonwoven were tested and then evaluated respectively.

Abstract: Natural plant extracts without non-toxic side effect and the relevant products are gaining popularity, and make natural medicines one option of health care. This study combines polypropylene (PP) fibers, high-absorption polyacrylate (HPA) fibers with weight ratios of 100/0, 90/10, and 80/20 wt % with a nonwoven manufacturing process to form PP/HPA nonwoven fabrics, after which the fabrics are immersed in a Bletilla striata (BS) extract, and then dried, yielding functional PP/HPA/BS nonwoven fabric. Stereomicroscopic observation, tensile strength test, tear strength test, and air permeability test are performed on the sample to evaluate the difference in mechanical properties before and after the immersion. In vitro test evaluates the biocompatibility of BC extract. The experimental results show that functional PP/HPA/BS nonwoven fabrics have optimal mechanical properties and an optimal content of 32.2 % BS extract when the nonwoven fabrics are made with an 80:20 ratio.

Abstract: The formation of culture medium plays a crucial role in whether roofs greening could be succeeded or otherwise, particularly for completed buildings. In this study, waste fiber Tencel ®, low-melting point fiber (PET) and waste fiber (PET) are chosen to be laminated into a medium with 15 cm in its thickness due to reducing the load on the roof and culture soil; meanwhile, two kinds of herbaceous plants, Ruellia brittoniana Leonard and Alternanthera versicolor, are planted in order to regulate the improved adequacy of culture medium. The result of this empirical experiment indicates the life of herbaceous plants can be maintained in the improved culture medium, and the selective materials, manufacturing parameter along with layers of culture soil that undergo a series of tests, such as water permeability, moisture content and water retention. The evidence spontaneously bears out the fact that the waste fabric improved culture medium shares the identical eco-greening functionality as the traditional cultivated soil does; by doing so, not only the eco-appeal for utilization of waste and lightening the culture medium on the roof can be achieved, a benefic contribution could consequently be made to the improvement of urban greening.

Abstract: Greening on roofs that are not totally used can create a good cooling effect and mitigate the urban heat island effect. Considering the load capacity of roofs and ecological protection, this study thus uses fiber waste to make culture mediums as an extensive green roof, after which sedum makinoi is then planted to evaluate the cooling effect of the waste fiber culture medium. The experimental results show that sedum makinoi planted with waste fiber culture medium can averagely reduce the temperature of the roof surface by 5 °C and to a maximum of 11.8 °C. Although experimental group and control group both have the same cooling effect, waste fiber culture medium which is much lighter than that of the control group, and it also has a life-cycle, an energy-saving, ecological friendly merit, both of which qualify it for use of the culture medium as extensive green roof.