Materials Literature
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We review our efforts to develop and implement robust computational approaches for exploring phase stability to facilitate the prediction-to-synthesis process of novel functional oxides. These efforts focus on a synergy between (i) electronic structure calculations for properties predictions, (ii) phenomenological/emp…
Being based on data about electronic and crystal structure of copper salts, their using perspective for fire retardants of epoxy-amine composites have been foreseen. Epoxy-amine composites modified by copper compounds, in particular, by copper(ІІ) carbonate have been elaborated. Influence of fire retardant onto proces…
In this paper crystalline noble metallic nanorods including Au and Ag with sub-10 nm diameter, are encapsulated within prealigned and open-ended multiwall carbon nanotubes (MWCNTs) through an electrodeposition method. As the external surface of CNTs has been insulated by the epoxy the CNT channel becomes the only path…
Residual stress is an important factor in machining process an attempt has been made to analyze the residual stress in turning of AISI4340 steel. The residual stresses that can be found in a cutting tool insert are mainly generated at the final step of the machining process. Feed, speed, depth of cut are the input par…
In order to improve the traditional methods of procyanidins extracting, ultrasonic-assisted filtration was used in the process of extracting proan-thocyanidin which was from membrane concentration of grape seed. Through the mechanism analysis of ultrasonic-assisted ultrafiltration, ultrasonic is able to alleviate the…
Measurements of Raman spectra, dielectric constant and magnetization were performed on M-type hexaferrite SrCo2Ti2Fe8O19 single crystal, which was grown by travelling solvent method in an optical furnace. The Raman spectra measurements at room temperature revealed that main Raman modes, which are associated with the b…
Trimellitic anhydride chloride와 1,4-butanediol을 이용하여 1,2,4-benzenetricarboxylic acid 1,4-anhydride butylene ester(BCAB)를 새롭게 합성하였다. 합성된 BCAB와 6가지의 서로 다른 디아민(diamine)들을 이용하여 전구체 poly(amic acid)(PAA)를 합성한 후, 열적 이미드화 반응을 통해 에스터 구조를 가지는 폴리에스터이미드(poly (ester imide), PEsI) 필름을 얻었다. 디아민 중 2,2
본 연구는 수술 후 유착방지 기능을 갖는 gellan gum(GLG)과 chondroitin sulfate(CH) 조성젤을 만들고 그 효능을 평가하였다. GLG/CH 조성 젤에 phosphate buffered saline(PBS)와 calcium chloride(CaCl2)를 첨가하여 젤을 가교시켰다. 젤의 특성을 확인하기 위해 팽윤성, 젤화도, 젤강도를 측정하고 FTIR로 특성을 확인하였다. Rat에 양성대조군, 음성대조군, 실험군을 넣어 유착방지 효능을 평가하였다. GLG/CH(3:3) 조성 젤은 복막의 조직 유착방지제로 높은 효과를 나타냈고 조직 유착방지막…
Nafion® membranes were developed by DuPont, a perfluorosulfonic acid/polytetrafluoroethylene copolymer. These membranes are hydrophilic and the water is preferentially sorbed into the clusters due to the hydrophobic character of fluorocarbon matrix. The sulfonic acid groups are chemically active and fixed within the T…
The objective of this study is to analyze the relationship between stream water quality of TN (total nitrogen), TP (total phosphorus), and BOD (Biochemical Oxygen Demand) and TDI (Trophic Diatom Index) score determined by physico-chemical factors, biomass, and standing crops of epilithic diatoms, and to estimate the r…
In this study, coconut fibers were pretreated using NaOH solution and liquefied in hot-compressed water. A Box–Behnken design (BBD) was applied to identify the optimum liquefaction condition. The individual and interactive effects of four factors on liquefaction reaction were evaluated by the response surface methodol…
Full ferroelastic and simultaneously ferroelectric materials are interesting candidates for applications in devices based on multiferroic heterostructures. They should allow for non-volatile and low-power writing of data bits in magnetoelectric random access memories. Moreover, ferroelasticity, in contrast to piezoele…
The dielectric properties of (Ba0.92-xBix)(Ti1-yMny)O3 (BBTM)(x = 0.01–0.03, y = 0.008 or 0.016) ceramics were investigated. For bismuth content smaller than 0.02, BBTM appeared as a normal ferroelectric. For x = 0.02, there exist a clear diffuse phase transition character, associated with a broad permittivity peak vs…
Through ligand modification, we have replaced the central benzene ring of H2TDBA ([1,1′:3′,1″-terphenyl]-4,4″-dicarboxylic acid) with the pyridine structurally related ligand H2PDDA (4,4′-(pyridine-2,6-diyl)dibenzoic acid), which makes the central pyridine ring of H2PDDA more coplanar with two benzene rings on both si…
탄소섬유강화 복합재는 기계적 물성이 우수하여 다양한 산업분야에서 활용되고 있으나 섬유길이가 짧은 단섬유 형태로 함침 되고 있어 강도와 강성을 증대시키는데 한계가 있다. 이를 보완하기 위한 LFT-D성형은 탄소 또는 유리섬유를 열가소성 수지와 혼합하여 압출 후 프레스 성형하여 제품을 만드는 공법으로 연속공정이 가능하고 사출성형에 비해 생산성이 높아 자동차 구조용 부품을 제작하는데 사용할 수 있다. 본 연구에서는 LFT-D공법으로 성형된 탄소 장섬유강화 열가소성 복합소재의 기계적 특성을 파악하기 위하여 탄소 장섬유의 함침과 압출공정을 수행할 수 있는 Lab scale의…
The transportation sector is the biggest contributor to air pollution in Indonesia, especially in metropolitan cities. Gases such as oxides of nitrogen (NOx) are produced during the combustion of fossil fuels in the internal combustion of vehicle engines. Oxides of nitrogen such as nitric oxide (NO) and nitrogen dioxi…
Abstract Analyzing and modeling methods for warpages including cylindrical deformations are discussed in large-area dies with redistribution layers (RDLs) and thin 50-µm-thick Si substrates. The buckling behavior of warpage, a deformation transition from spherical to cylindrical, strongly depends on the lateral sizes…
The ferroelectric and piezoelectric properties of (1−x)Bi0.5(Na0.8-K0.2)0.5TiO3-xBaZn0.5W0.5O3 ((1−x)BNKT-xBZW) ceramics have been studied to clarify the temperature dependence of the polarization-electric field (P-E) hysteresis and dielectric properties. Based on the temperature dependence of the dielectric constant,…
From the [001] grown Sr2FeMoO6 double perovskite (SFMO) it was excised a slab with (001) free surfaces and half c wide. A supercell was constructed with that slab, leaving a 10 Å vacuum region along the [001] direction, in such a way that it is possible to deal with the slab as an insulated system. After the correspon…
The aim of this study is to verify through tensile, hardness and metallography tests the influence of heat treatments of martempering, quenching in brine, normalizing and annealing in the mechanical properties and in the microstructure of the SAE 1045 steel. The results found an alteration in microstructural compositi…