Materials Literature
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Undoped and Sb-doped $SnO_2$ nanofibers were prepared by electrospinning and their responses to $H_2$ , CO, $CH_4$ , $C_3H_8$ , and $C_2H_5OH$ were measured. In the undoped $SnO_2$ nanofibers, the gas response ( $R_a/R_g$ , $R_a$ : resistance in air, $R_g$ : resistance in gas) to 100 ppm $C_2H_5OH$ was very high(33.9)…
Abstract A series of ethylene and acrylonitrile composite elastomers were prepared using (1,4‐bis(2,6diisopropylphenyl)‐acenaphtenediimine‐nickel(II))‐dichloride/ethylaluminum sesquichloride (EASC). The xylene‐soluble polymer fraction showed nitrile bands in infrared spectroscopy at 2 245 and 2 214 cm−1 and polyacrylo…
짧은 바깥쪽 탄소 나노튜브를 가진 이중벽 탄소 나노튜브 공진기의 경우, 자유로운 끝은 긴 안쪽 벽의 진동에 중요한 역할을 한다. 짧은 안쪽 탄소 나노튜브를 가진 이중벽 카본 나노튜브 공진기의 경우, 안쪽은 부드러운 코어로 작동하여 기본 주파수가 이들의 길이에 의해 영향을 받는다. 본 논문에서는 서로 다른 길이를 가지고 나노튜브로 구성된 이중벽 탄소 나노튜브 공진기의 주파수 변화를 분석한다. 분석 결과, 안쪽 혹은 바깥쪽 탄소 나노튜브 길이를 제어하는 다양한 주파수 소자를 구현하는데 널리 응용될 수 있을 것으로 판단된다. For a double-walled carbo…
In this study, we used activated carbon (AC) and charcoal (CH) as carbon sources with TiO 2 powder to prepare spherical carbons containing titania (SCCT) by using phenolic resin (PR) as a bonding agent. The physicochemical characteristics of the SCCT samples were examined by BET, XRD, SEM, EDX, iodine adsorption and c…
In this paper the modelling of an important industrial problem is addressed, which involves the two-component turbulent flow with heat transfer that takes place inside protective clothing. The geometry of the flow boundaries is reconstructed in a CAD system from photogrammetry scan data. The overall model is sufficien…
The tubes in liquid sodium–water steam generators of the Indian prototype fast breeder reactor (PFBR) will be supported by corrugated nickel alloy 718 strips. Aluminisation of nickel alloy 718 strips has been chosen for this application because of the excellent performance of aluminide coatings in reducing impact fret…
A ZrO 2 thin film as a corrosion protective layer was deposited on Zircaloy-4 (Z-4) clad material using N 2 O as a reactive gas by RF reactive magnetron sputtering at room temperature.The Z-4 substrate was located in plasma or out of plasma during the ZrO 2 deposition process to investigate mechanical and corrosive pr…
본 연구는 에폭시의 난연 특성을 향상시키기 위하여 친환경, 저가, 고종횡비(high aspect ratio)를 갖는 무기계 난 연첨가재인 일라이트를 사용하였고, 친수성 일라이트의 소수성 에폭시 내 분산 문제점을 개선하기 위하여 불소화 반응 을 이용하여 일라이트의 소수화 개질을 실시하였다. 일라이트의 불소화 개질에 의하여 경화 전 에폭시 용액 내에서 일라 이트의 분산성 및 경화 후 형성된 복합체 내에서의 일라이트 분산성도 향상되었다. 이러한 분산성의 향상은 일라이트 불소화 개질로 인하여 소수화된 일라이트의 에폭시 용액에 대한 친화성 향상과 복합체 형성 시 에폭시 고분…
Abstract The creepage of corrosion underneath a coatings film applied to a steel test panel is often used as a performance test for the anti-corrosion properties of a coating system. Creepage is defined as the degree of corrosion (usually measured in mm) emanating away from a scribe line underneath a coating film appl…
Here we report the fabrication and characterization of pH sensors using aligned single-walled carbon nanotubes (SWNTs). The SWNTs are dispersed in deionized (DI) water after chemical functionalization and filtration. They are deposited and organized on silicon substrates with the dielectrophoresis process. Electrodes…
Hydrogen chloride and ammonia permeation resistance were measured through two grades of tetrafluoroethylene−perfluoroalkoxy copolymers using standard manometric procedures. Hydrogen chloride showed a lower permeation coefficient than ammonia due to the combined effect of different molecular size and interaction with p…
It has been proposed that the measurement of the characteristics of electroluminescence (EL) observed during the application of ac and dc electric fields across thin films of polymeric material can be used to probe the early stages of electrical ageing. Both EL and electrical ageing of the polymer are thought to arise…
본 연구에서는 고분자 전해질 연료전지의 탄소 지지체로 중형기공 실리카(SBA-15)를 이용한 전통적인 주형합성법을 이용하여 중형기공 탄소(CMK-3)를 합성하였다. 합성된 CMK-3는 추가적으로 비표면적과 물리적 성질을 증가시키기 위하여 활성화제로 수산화 칼륨(KOH)양을 0, 1, 3, 및 4 g으로 달리하여 활성화하였다. 그리고 활성화된 CMK-3(K-CMK-3)에 화학적 환원 방법을 이용하여 백금과 루테늄을 담지하였다. CMK-3에 담지된 백금-루테늄 촉매의 특성을 확인하기 위해 비표면적 장치(BET), X-선 회절분석법(XRD), 주사전자현미경(SEM), 투…
Ferroelectrets, with their internal bipolar charges on the surfaces of the voids can be viewed as a collection of a large number of individual tiny electret ionization chambers. Electrets in ionization chambers are discharged upon irradiation with ionizing radiation. The discharge of cellular propylene is studied upon…
본 논문은 LNG 선박의 이중연료엔진의 이중벽 가스파이프의 재료인 STS 304와 STS 316L에 대하여 GTAW에 의해 용접된 동종 및 이종 용접부의 기계적 특성과 용접성을 평가하였다. STS 304 동종 용접부의 경우, STS 316L 동종 용접부에 비해 모재 대비 현저하게 기계적 특성이 감소하는 경향을 나타냈다. 미세조직 관찰 결과, STS 304 동종 용접부가 STS 316L 동종 용접부에 비해 침상 페라이트가 많이 형성되어 상대적으로 높은 경도를 나타냈다.
Microwave heating (MW) was studied for the sintering of amorphous powders.In comparison to conventional heating (CV), the results show that microwave heating has the potential to substantially accelerate the sintering process and allow for highly densified solidification by eliminating the pores and increasing the shr…
In this letter, we study the contemporary technologies for making ferroelectric films and the possibility of using the oscillator model of PZT-22 to analyze its ferroelectric properties. The material showed permittivity dispersion at 65 KHz and 88.5 KHz. We obtained relative attenuation γ, relaxation time τ, and ɛmax…
Electrochemical anodic oxidation of a metal anode in an acetone solution of 2,5-diamino-3,4-dicyanothiophene gave the polythiophene metal complexes of Co, Ni, Cu, Zn, Cd, and Sn. Chemical analyses, as well as FTIR and electronic spectral data, are presented to confirm the formulation of the isolated materials. DC elec…
The investigation is directed to lead free (Pb-free) frits that can be used for organic light emitting diode, plasma display screen devices and other sealing materials. P 2 O 5 -SnO system glasses have been prepared for Pb-free low temperature glass frit. Structure and properties of the glasses with the composition Sn…
The reactions of tribenzyltin(IV)chloride with one mole equivalent of sodium salts of semi- and thiosemicarbazone ligands gave complexes of the type Bz3SnL (L = semicarbazone or thiosemicarbazone moiety). These compounds have been characterized by elemental analysis, IR, 1H, 13C{1H}, and 119Sn (in few cases), NMR spec…