Category: Materials Science and Engineering

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Thermal Stabilization of HEWL by Adsorption on Biochar

The heat stress tolerance of hen egg white lysozyme (HEWL) was markedly enhanced by the adsorption of HEWL on bamboo charcoal powder (BCP), which is a kind of biochar. HEWL was firmly adsorbed on BCP even at high temperatures. The secondary structure of HEWL was altered to some extent by the adsorption of HEWL on…
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January 17, 2020 0

Effect of Solvent on Catalysis of Protease Adsorbed on Biochar in Organic Media

The adsorption immobilization of the serine protease α-chymotrypsin (α-CT) onto bamboo charcoal powder (BCP), which is a kind of biochar, improved the transesterification rate of N-acetyl-L-tyrosine ethyl ester (N-Ac-Tyr-OEt) with n-butanol (BuOH) in 9 organic solvents. Organic solvents strongly affected the catalysis of BCP-adsorbed α-CT. The transesterification rate of BCP-adsorbed α-CT was much superior to…
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January 17, 2020 0

The Ni(II) Complex of 2-Hydroxy-Pyridine-N-Oxide 2-Isothionate: Synthesis, Characterization, Biological Studies, and X-ray Crystal Structures Using (1) Cu Kα Data and (2) Synchrotron Data

C12H20N6NiO6S2 or NiL2(SCN)2](NH4)2.2H2O, where L is 2-hydroxy-pyridine-N-oxide, has been prepared and characterized using elemental analyses, IR, UV and visible spectrometry, magnetic moment measurements, thermal analyses and single crystal X-ray analyis. The results indicate that the complex reacts as a bidentate ligand and is bound to the metal ion via the two oxygen atoms of the…
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January 17, 2020 0

AC Conductivity Characteristics of Polymer/Metal Oxide Thin Films

Organic/inorganic polymer composite films containing poly (methyl-methacrylate) (PMMA)/ ferric oxide Fe2O3 were prepared following solution casting technique. Dielectric Properties of films has been studied using LCR meter at room temperature 26ºC. Also optical properties have been studied using digital abbey refractometer. The dielectric behavior of films have been studied as a function of concentration, and…
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January 17, 2020 0

Prediction of Onset of Mode I Delamination Growth under a Tensile Spectrum Load

In this investigation, the onset of mode I delamination growth under a standard aircraft spectrum load sequence, mini-FALSTAFF truncated to contain only tension-tension fatigue cycles is predicted. The study was carried out on a standard Double Cantilever Beam (DCB) test specimen of Uni Directional (UD) layup Carbon Fiber Composite (CFC) IMA/M21. Finite element modeling and…
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January 17, 2020 0

Reprocessing Leading to Lower Thermal Conductivity of ZnO Thermoelectrics

Nanometer sized ZnO powder was co-doped with gamma aluminum oxide and gallium oxide and sintered using a direct current sintering furnace. Sintered samples were reprocessed by crushing the samples in a Carver press, then milling for 4 hours. The reprocessed samples were then re-sintered in the direct current sintering furnace. Heat capacity, density and thermal…
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January 17, 2020 0

Polymer Based Nanocomposites for Power Engineering Applications

Polymer nanocomposites is a combination of polymer matrix and with a wide range of 1-D, 2-D or 3-D filler materials (organic and inorganic) having at least one dimension in nm range. Polymer nanocomposites have unique structures, morphology as well as mechanical, thermal and electrical properties. Therefore, study on polymer nanocomposites are being continued for about…
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January 17, 2020 0

Advanced Thermal Barrier Coatings

Yttria Stabilised Zirconia (YSZ) is a conventionally used top coat material for a thermal barrier coating (TBC) system below 1200°C. However, YSZ is not suitable as top coat above 1200°C on account of its sintering effect. Advanced coatings have been developed by the researchers, which would satisfy the need for the mechanical and the thermal…
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January 17, 2020 0

Optimization of Packaging Line Performance: A Case Study of AB Breweries in Nigeria

This paper presents an approach for improving productivity in breweries. A case study of AB brewery was adopted. Traditionally, packaging line improve performance and productivity based on extrapolation of past experience, but in recent times, the traditional method could not meet up with high increase in demand of products, hence the need to adopt a…
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January 17, 2020 0

Controlled Oxidation of a Tetrafunctional Thiol to Obtain a Poly (Thiol- disulfide) Oligomer and Its Use as Self-healing Agent for Epoxy/Thiol-ene Photocurable Systems

In this work the pentaerythritol tetrakis (3-mercaptopropionate) was partially oxidized to obtain an oligomer with both thiol and disulfide functional groups in its structure, by using iodobenzene diacetate (IBDA) as oxidant. This oligomer was used to introduce disulfide bonds into the crosslinked network of a polyether-polythioether matrix obtained by photopolymerizing an epoxy/thiol-ene system. The presence…
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January 17, 2020 0