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131.
S. W. Lee H. B. Chae D. S. Park Y. H. Choa K. Niihara B. J. Hockey 《Journal of Materials Science》2000,35(18):4487-4493
-silicon nitride whiskers were aligned unidirectionally in silicon nitride sintered with 2 wt% Al2O3 and 6 wt% Y2O3. It was be densified by the Gas Pressure Sintering (GPS) method. Thermal conductivity of the sintered body with different amount of - silicon nitride whiskers was measured by the direct contact method from 298 K to 373 K. This unidirectionally oriented -silicon nitride whiskers grew into the large elongated grains, and improved also the thermal conductivity. The amount of -silicon nitride whiskers changed the microstrcuture, which changed the thermal conductivity. 相似文献
132.
Etch characteristics of magnetic tunnel junction (MTJ) stack masked with TiN films were investigated using an inductively coupled plasma reactive ion etcher in Cl2/Ar and BCl3/Ar gases for magnetic random access memory. The effect of etch gas on the etch profile of MTJ stacks was examined. As Cl2 and BCl3 concentrations increased, the etch slope of etched MTJ stack became slanted and the dimensional shrinkage was observed. A high degree of anisotropic etching of MTJ stacks was achieved using Cl2/Ar gas at the optimized etch conditions. 相似文献
133.
Lee YI Lee KJ Kim KD Kim HT Chang YW Kang SC Choa YH 《Journal of nanoscience and nanotechnology》2007,7(11):3910-3913
In this study indium tin oxide (ITO) nanofibers were synthesized using an electrospinning method. The morphological properties of the ITO nanofibers were considered and their specific resistances were measured to determine their applicability as filler for a transparent conducting film. ITO/PVP composite nanofibers were successfully obtained by electrospinning using a precursor solution containing indium nitrate, tin chloride, and poly(vinlypyrrolidone). After the heat treatment of ITO/PVP composite nanofibers at 600 degrees C and 1000 degrees C, ITO nanofibers with an average diameter of about 168 nm and 165 nm were synthesized, respectively. 相似文献
134.
Hyo-Ryoung Lim Nu Si A Eom Jeong-Ho Cho Hong-Baek Cho Yong-Ho Choa 《International Journal of Hydrogen Energy》2018,43(43):19990-19997
Nano-engineered composite film, prepared by the combination of titanium (Ti) nanoparticles with surrounding layers of palladium (Pd), has been suggested as a high performance hydrogen (H2) getter. Uniform TiPd film covered by a 35-nm-thick Pd layer was deposited on a silicon wafer via cosputtering and post-vacuum-annealing. As the annealing temperature increased from 200 to 400 °C, amorphous alloy and nano-aggregates were observed, and efficient structural modulation occurred at 400 °C, where dewetting of Pd cover layer from the getter surface was observed. This led to the enhancement of the chemisorption capacity of the 400oC-annealed sample, two-times higher than that of the 300oC-annealed sample. Abrupt change in residual gases, which typically come from a bonding process, can be mitigated by minimizing the gas transfer distance through the dewetting of the cover layer; since Ti nanoparticles surrounded by Pd exist independently of each other in the gettering layer, external H2 gas molecules can be continuously adsorbed onto still-unreacted Ti particles by passing through the dewetted channels in the Pd cover layer. This concept demonstrates a pathway towards a useful synthetic approach for high-performance thin-film getters with high adsorption capacity, fast gettering rate and good device compatibility. 相似文献
135.
Jong-Hyun Lee Daejin Park Jong-Tae Moon Yong-Ho Lee Dong Hyuk Shin Yong-Seog Kim 《Journal of Electronic Materials》2000,29(10):1264-1269
In an attempt to develop a thermally stable solder system, an in-situ Pb-Sn solder composite reinforced with Cu6Sn5 dispersoids was investigated for its thermal stability. The stability was evaluated mainly by measuring the growth rate of
intermetallics at in-situ composite solder/BLM interface as a function of the number of reflow soldering cycles and aging
time. The rates were compared with those of the eutectic Pb-Sn and Sn-Ag solders. After the thermal treatments, the solder
joints were tested for their shear strengths. The results indicated that the in-situ composite solder has a higher shear strength
and better thermal stability than the eutectic Pb-Sn solder.
Jointly appointed by CAAM at POSTECH 相似文献
136.
137.
The effects of self-assembled monolayer (SAM) and perfluoropolyether (PFPE) lubricant on the wear characteristics of flat
silicon tips were investigated. The wear test consisted of sliding the silicon tips fabricated on a flat silicon specimen
against SAM and PFPE (Z-tetraol) coated silicon (100) wafer. The tips were slid at a low speed for about 15 km under an applied
load of 39.2 μN. The wear volume of the tip was obtained by measuring the tip profile using an Atomic Force Microscope (AFM).
It was found that the coatings were effective in reducing the wear of the tips by an order of magnitude from 10−6 to 10−7. 相似文献
138.
A robust, single transverse mode slab-coupled buried-rib waveguide laser by combining the concept of slab-coupled waveguide and the technique of diluted waveguide is demonstrated. The large mode size and near-circular mode profile result in high fibre coupling efficiency and improved alignment tolerance. 相似文献
139.
Seong-Hun Jeong Yoonjoong Kim Ah-Ra Lyu Sun-Ae Shin Tae Hwan Kim Yang Hoon Huh A Reum Je Akanksha Gajibhiye Yang Yu Yongde Jin Min Jung Park Yong-Ho Park 《International journal of molecular sciences》2021,22(18)
Delivery of substances into the inner ear via local routes is increasingly being used in clinical treatment. Studies have focused on methods to increase permeability through the round window membrane (RWM) and enhance drug diffusion into the inner ear. However, the clinical applications of those methods have been unclear and few studies have investigated the efficacy of methods in an inner ear injury model. Here, we employed the medium chain fatty acid caprate, a biologically safe, clinically applicable substance, to modulate tight junctions of the RWM. Intratympanic treatment of sodium caprate (SC) induced transient, but wider, gaps in intercellular spaces of the RWM epithelial layer and enhanced the perilymph and cochlear concentrations/uptake of dexamethasone. Importantly, dexamethasone co–administered with SC led to significantly more rapid recovery from noise-induced hearing loss at 4 and 8 kHz, compared with the dexamethasone-only group. Taken together, our data indicate that junctional modulation of the RWM by SC enhances dexamethasone uptake into the inner ear, thereby hastening the recovery of hearing sensitivity after noise trauma. 相似文献
140.
Silicon/Silicon Carbide Composites Fabricated by Infiltration of a Silicon Melt into Charcoal 总被引:4,自引:0,他引:4
Dong-Woo Shin Sam Shik Park Yong-Ho Choa Koichi Niihara 《Journal of the American Ceramic Society》1999,82(11):3251-3253
Dense Si/SiC composites were fabricated via a conventional reaction-bonding process, using oak charcoal that exhibited a honeycomb structure. The silicon melt was infiltrated into the porous oak charcoal (density of ~0.6 g/cm3 ) while the sample was heated to 1700°C under vacuum (10-3 torr (~0.133 Pa)), which resulted in in situ silicon-fiber/SiC composites. The reaction product had an average density of 2.8 g/cm3 and showed three-point flexural strengths of 330 MPa at room temperature and 280 MPa at 1300°C. Good oxidation resistance also was observed at temperatures up to 1300°C in flowing air. This process provided excellent shape-making capability, because the charcoal that was used as a preform was readily machinable. 相似文献