Materials Literature
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A glass wool media is commonly classified as a medium made up of many capillaries. They might, however, be considered analogous to a network of tubes as a bundle of capillaries. The capillary pressure of such a medium would be dependent on the amount of fluid held within the bundles. But, this very simple picture of p…
Since its inception, researchers in structural biology have reported detailed molecular models of macromolecules involved in the functioning of the human body. This wealth of information has provided a better understanding of the molecular mechanisms by which the proteins and enzymes perform their biochemical and phys…
Encapsulation of cells in polymeric shells allows for separation of biological material from produced factors, which may find biotechnological and biomedical applications. Human T-lymphocyte cell line Jurkat as well as rat pancreatic islets were encapsulated using LbL technique within shells of polyelectrolyte modifie…
The effect of the addition of selected refractory metals on structure and magnetic properties was studied for the nanocomposite Nd9Fe77−x B14M x (M=Ti, Mo, Nb) system, consisting of hard magnetic Nd2Fe14B phase, and soft magnetic phases (Fe, Fe3B). It was found that 2–5 at % of Ti, Mo or Nb addition leads to a substan…
A two-phase model is proposed for describing the dynamics of a fluidized bed reactor used for polypropylene production. In the proposed model, the fluidized bed is divided into an emulsion phase and bubble phase where the bubble phase flow pattern is assumed to be plug flow and the emulsion phase is considered to be p…
Multilayer structures of ZrB 2 containing 30–70 wt% Ti were fabricated using a laser sintering/melting technique. Ti acted as the binding interface for the hard ZrB 2 particles. Structural properties and oxidation behavior of laser‐sintered samples were studied using high‐temperature X‐ray diffraction (HTXRD). HTXRD r…
Department of Chemistry, Hanyang University, Seoul 133-791, KoreaReceived January 13, 2010, Accepted February 8, 2011Key Words : Copper, Dissociative adsorption, Reconstruction, Thin film Oxidation of copper is known to occur during corrosionprocess, but if the oxidation is controlled under rightcondition, desirable o…
Abstract The magneto- and electro-transport properties of two series of nanocrystalline (1− x ) La 0.7 Ca 0.3 MnO 3 + x A (A: Al 2 O 3 and Ag) composites have been systematically and thoroughly studied. The observed electronic transport behavior over the whole temperature range (5–300 K), especially the change in meta…
베타 차단제 억제제(atenolol, propranolol, timolol and nadolol)의 존재와 부존 하에서 0.1M HCl 용액에 담긴 알루미늄의 부식작용을 연구하였다. 이 연구에 무게감량, 변전위 편극, 전기화학 임피던스 분석법이 사용되었다. 억제 효과는 억제제의 농도 증가에 따라 증가하였으며, 온도가 증가함에 따라 감소하였다. 모든 억제제들은 Frumkin 등온을 따르는 알루미늄 표면에 흡착되었다. 부식반응은 전하이동과정에 의해 조절됨을 발견하였다. 억제 효과 측정을 위해 사용된 실험방법 들에 대해 조사한 결과 모두 억제효과가 우수하였다. Corro…
Abstract The influence of heat treatment time and temperature on the microstructure and corrosion resistance of cast stainless steel alloys CN3MN (UNS J94651) and CK3MCuN (UNS J93254) were investigated with a combination of microscopy techniques and immersion corrosion testing. The as-cast alloys exhibited significant…
Present study is focused on the utilization of coagulum of euphorbia as binder in polyester banana fiber composite. Euphorbia coagulum (dried latex) is rich in resinous mass (60-80%), which are terpenes and polyisoprene (10-20%). Effect of varying percentage of coagulum content on various physico-mechanical and fire p…
The electronic and structural properties of Si${}_{x}$Sb${}_{100\ensuremath{-}x}$ ($x$\ensuremath{\sim}16) materials are investigated using first-principles molecular dynamics simulations. Crystalline-liquid-amorphous phase transitions are examined and remarkable changes in the local structure around the Si atoms are…
A series of linear and angular distyrylpyrazines and lateral donor groups has been prepared by aldol condensation between dimethylpyrazines and the appropriate aromatic aldehyde. The optical absorption and emission properties of these systems were studied in different solvents and media. The materials display a strong…
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Noble metal nanostructures of Au, Ag and Cu were prepared on two types of carbon-modified W(110) surfaces-R(15 × 12) and R(15 × 3)-and investigated by means of scanning tunneling microscopy. For all deposited metals qualitatively the same behaviour is observed: On the R(15 × 12)-template always isotropic clusters are…
Intact and fragmented proteins, eluted from self-assembled monolayer (SAM) surfaces of alkanethiols of different chemistries (-CH₃, -OH, -COOH, -NH₂), following exposure to human plasma (HP) or human serum (HS), were examined using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and immunoblotting…
Making use of chitosan (CS) and ethylenediaminetetraacetic acid (EDTA) as a reaction system, CS-EDTA nanoparticles were synthesized through a facile counterion complex coacervation method. <TEX>$Ag^+$</TEX> could enter porous CS nanoparticles synthesized with this method, allowing Ag nanoparticles within chitosan nano…
Diffusion couple experiments were performed in the Co-Ni binary system for determining inter-, impurity- and intrinsic-diffusion coefficients in the temperature range of 1050 - 1250°C. The activation energy and pre-exponential factor estimated for interdiffusion do not vary significantly with composition. The activati…
Abstract An operating window, which is bounded by two temperatures and draw ratios, defines the stable and defect‐free stretching region of a polymer film. Physical properties including the coefficient of thermal expansion (CTE), birefringence, and Young's modulus of a recyclable polyimide (PIR) film were measured und…
Abstract Nylon 66 has been transformed into a material with significantly improved properties like hardness, tensile strength, and flexural modulus by processing it under the optimized dose rate of electron beam in the presence of suitable crosslinkers. Furthermore, percent water absorption of nylon 66 was reduced sub…