Materials Literature
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Abstract : Multi-scale modeling of complex material systems requires starting from fundamental building blocks to capture the scale relevant features through associated computational models. In this paper, molecular dynamics (MD) modeling is employed to predict mechanical properties of key hydrated cement constituent…
The Cu-containing ionic liquids (IL), like [BMIm]Cl-1.8AlCl3-0.5CuCl and [Et3NH]Cl-1.8AlCl3/ CuAlCl4, were synthesized and characterized. The selectivity of isobutene/butene alkylation of Cu-containing IL was also investigated. The results showed that the selectivity had little relation to the acidity of Cu-containing…
An analysis shows that the ground state of the inhomogeneous system of interacting electrons in the static external field, which satisfies the thermodynamic limit, can be consistently described only using the Green function theory based on the quantum field theory methods (perturbation theory diagram technique). In th…
In this study, an anion-exchange ionomer solution was developed by employing poly(2,6-dimethyl-1,4-phenyl-ene oxide) (PPO) as the base material for the improvement of the capacitive deionization (CDI) performances. It was found that prepared quaternized PPO (QPPO) exhibited excellent ion conductivity superior to that…
The effects of processing parameters on the flow behavior and microstructures were investigated in hotcompression of powder metallurgy (P/M) Ti-6Al-4V alloy. The alloy was fabricated by a blended elemental (B/E)approach and it exhibited lamellar α+β microstructure. The hot compression tests were performed in the range…
기존의 폴리아마이드 박막 역삼투 복합막(PA TFC RO Membrane)은 우수한 분리투과특성을 지니고 있으나 내염소성이 상대적으로 낮은 단점을 지니고 있다. 본 연구에서는 이를 해결하기 위하여 표면에 -OH나 -COOH 기가 도입된 다공성 지지체를 제조하고, 그 표면에 폴리아마이드 박막을 형성하여 역삼투 복합막을 제조하였다. 제조된 역삼투막의 구조 및 분리투과 특성은 여러 가지 기기분석 방법과 투과테스트 방법으로 분석하였다. 폴리아마이드 박막을 제조하기 위하여 아민계 단량체로는 메타-페닐렌 디아민(MPD)과 2,6-디아민 톨루엔(2,6-DAT)을 사용하였고, 디…
PEBAX[poly(ether-block-amide)-ZIF-8(zeolitic imidazolate framework) composite membranes were prepared with different amounts of ZIF-8; 0, 1, 3, 7, 10, and 20 wt%. Gas permeation experiment were performed by varying the temperature of 25, 35, 40°C under condition 6 kgf/cm2. Gas permeability of C3H6, C3H8 and selectivit…
Activated charcoal supported nickel molybdenum carbide (carburized Ni-Mo/AC) catalysts were prepared by wet-impregnation followed by temperature-programmed carburization using 20% $CH_4/H_2$ gas. The effects of pH and initial Ni/Mo mole ratio during wet-impregnation step on the characteristics of the carburized Ni-Mo/…
SiO2 thin layers in thicknesses (1, 5, 10, 18 nm) on TiO2 thin layer in thickness 79 nm deposited by reactive RF sputtering technique. The deposited films were heat treated at temperatures (200, 400, 500, 600°C). The surface properties of thin films by atomic force microscopy (AFM), surface chemical composition by X-r…
以ZSM-5粉末为载体,钛酸四丁酯为前驱物,无水乙醇为溶剂,制备了TiO2/ZSM-5光催化剂。用XRD,SEM等分析手段对催化剂的物相,形貌进行了表征,并通过对亚甲基蓝染料废水进行的光催化降解实验,讨论了催化剂用量,溶液的pH,污染物初始浓度等因素对催化剂光催化活性的影响。结果表明,ZSM-5粉末负载TiO2催化剂有很好的吸附和光催化性能,并可以多次回收重复使用,在催化剂投加量为0.2 g/L,溶液pH=5,污染无初始浓度为50 mg/L的条件下,光催化效果最佳,300 min后的降解率可达99.47%。
Процессы скоростного формоизменения, особенно скоростного горячего выдавливания, создают эффективные условия для обработки малопластичных и труднодеформируемых материалов, широко используемых в инструментальном производстве. В связи с тем, что высокоскоростная штамповка обеспечивает получение точных заготовок с повыше…
The two apparently disparate phenomena, viz. the Klein tunneling and the electric field driven topological phase transition(TPT), exhibited by the silicene converge on the issue of the no change in the pseudo-spin. An ensuing possibility is that the former, in the case of a normal/magnetic/normal silicene junction, ma…
The connecting rod is one of the most important parts in automotive engines, transforming the reciprocalmotion of a piston generated by internal combustion into the rotational motion of a crankshaft. Recent advances in highperformance automobile engines demand corresponding technological breakthroughs in the materials…
Целью работы является оптимизация технологических параметров упрочняющей высокоэнергетической обработки напыленных покрытий из материалов на основе оксидной керамики с включениями твердой смазки. Приведены результаты исследования влияния плотности мощности и суммарного количества импульсов лазерного излучения в пятне…
An intensely emitting crystalline europium(III) complex with cinnamic acid [Eu(Cin)3] n and exhibiting triboluminescent properties is synthesized. It is established that the measured photo- and triboluminescence spectra are identical for the above polymeric non-centrosymmetric complex and are determined by the charact…
The effects of polyethylene glycol and polymethyl methacrylate on reduction of silver(I) ions in the CF 3 COOAg-Q r -EA system (where Q r is quercetin and EA is ethyl acetate) were studied spectrophoto-metrically. The introduction of these stabilizers to the system inhibits the redox process. The inhibition of reducti…
The edge luminescence of ZnSe heterolayers on ZnSe substrates obtained by isovalent substitution is investigated. It is shown that the blue emission line originates from band-to-band recombination and the annihilation of excitons upon their inelastic scattering at free charge carriers.
To explore the influence of bulky backbone on complexes, three Co(II) and Zn(II) complexes with phenanthrene-9-carboxylate (L 1 ), 9 H -fluorene-9-carboxylate (L 2 ) or biphenyl-4-carboxylate (L 3 ) together with incorporating auxiliary bridging ligad 4,4′-bipyridine (4Bipy), were synthesized and characterized: [Co(L…
ZnO nanorods have been deposited on ITO glass by electrodeposition method. The optimization of two process parameters (precursor concentration and current) has been studied in order to control the orientation, morphology, and optical property of the ZnO nanorods. The structural and optical properties of ZnO nanorods w…
The phase state of fluid in the H 2 O-NaF-Na 2 SO 4 system in the presence of silicates (quartz and albite) was experimentally explored using the method of synthetic fluid inclusions in quartz at 700°C and pressures of 1 and 2 kbar. Parallel experiments were conducted under identical conditions with either two silicat…