Materials Literature
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Abstract Surmmary: Polyurethane elastomers (PUEs) were synthesized with poly(oxytetramethylene) glycol (PTMG), 4,4′‐diphenylmethane diisocyanate (MDI) and 1,4‐butanediol (BD)/1,1,1‐trimethylol propane (TMP) by a prepolymer method. The degree of microphase separation of bulk and ultrathin films for these PUEs was confi…
A new approach to modify silica for the purpose of optimizing the mechanical properties of filled natural rubber was carried out in this study. Based on the acidic characteristics of the silica surface, a basic cyclohexylamine (CA) solution was used as a modifer and the modification was successfully confirmed by FT‐IR…
Two bacterial strains, Pseudomonas aeruginosa CMG607w and CMG1421 produce commercially important biopolymers. CMG607w isolated from the sediments of Lyari outfall to Arabian Sea synthesize the mcl-polyhydroxyalkanoates from various carbon sources. The production of PHAs was directly proportional to the incubation peri…
Zn 0.92 Co 0.08 O nanowires with two different average diameters, 19 and 38 nm, have been made by the vapor transport and Co ion implantation method. The as-implanted nanowires were thermally annealed through multiple steps in a high vacuum. The morphology and crystal structure of the nanowires were inspected by use o…
Semiconductor quantum dots are at the forefront of materials science chemistry with applications in biological imaging and photovoltaic technologies. We have developed a simple laboratory experiment to measure the quantum-dot size from fluorescence spectra. A major roadblock of quantum-dot based exercises is the parti…
The presence of a hexagonal boron nitride (h-BN) phase in pulsed laser deposition PLD BN thin films has been evidenced by Raman spectroscopy, TEM and AFM measurements. The films have been deposited by means of PLD technique, fixing the laser fluence value at 1.35 J cm−2, at the substrate temperature T s=RT and T s=600…
In this report, the light emitting behavior of silver nanoclusters embedded in sodalime glass through ion-exchange technique is studied. The cluster sizes were varied through thermal annealing. The optical absorption spectra were recorded for all the glasses. The variation of surface plasmon resonance peak with the an…
The absorption and emission spectra of a liquid-crystalline melt prepared on the basis of a synthesized mesogenic europium (III) adduct are studied in the temperature range from 77 to 348 K. The main channels and rate constants of intramolecular energy transfer from ligands to Eu (III) ions are determined from the abs…
Conductive surfaces on woven fabrics were obtained by knife-over-roll coating in laboratory small-scale equipment and continuously in a pilot plant.Commercially available inherently conductive polymers (polyaniline, polytiophene and polypyrrole) were mixed with an acrylic binder polymer, and coated on a polyester fabr…
The mechanical behaviour (strength and stiffness) of natural fibre reinforced thermoplastics is investigated on the example of an injection moulded sisal-polypropylene system. An analytical model based on the rule of mixtures is developed to predict the mechanical behaviour of such composites. Considering interfacial…
Abstract Medium‐chain‐length polyhydroxyalkanoates (mcl‐PHAs) produced by Pseudomonas putida KT2442 can be chiral 3‐hydroxyalkanoic acids catabolized by the intracellular PhaZ depolymerase when the bacteria are cultured under carbon limitation. PhaZ is an intracellular depolymerase and is attached to PHA granules. In…
The analysis performed in this paper is based on the concepts of a heterogeneous nucleation and related controlling wave process. It is assumed that this wave process initiates a very rapid rearrangement of the atomic planes {110} c of the cubic phase into the basal planes {0001} h of the hexagonal phase. It is shown…
A presença de gradiente textural é comum e marcante em Argissolos. O objetivo do trabalho foi estudar a mineralogia das partículas envolvidas no processo de formação de gradiente textural em um solo subtropical do Rio Grande do Sul. Amostras de um Argissolo Vermelho-Amarelo distrófico abrúptico, material parental sedi…
To safeguard bodies of soldiers better, including their necks and joints, a novel armour material was exploited using nanocomposite. Compared with traditional armour materials, this new material possessed superior barrier property and more comfortable characteristics. The new armour material was made of Kevlar cloth a…
Nanocompósitos de polietileno de alta densidade/argila bentonita nacional foram preparados por intercalação por fusão. A influência da adição da argila sem tratamento e da argila tratada com o sal quaternário de amônio Cetremide e do polietileno graftizado com anidrido maléico (PE-g-MA) como agente compatibilizante fo…
We determine periodic and aperiodic points of certain piecewise affine maps in the Euclidean plane. Using these maps, we prove for $\lambda \in \left\{ \frac{\pm 1 \pm \sqrt{5}}{2}, \pm \sqrt{2}, \pm{\sqrt{3}} \right \}$ that all integer sequences $(a_{k})_{k \in \mathbb{Z}}$ satisfying $0 \leq a_{k-1}+\lambda a_{k} +…
This paper will give an introduction to the emerging technology of Phase Change Memory (PCM) and review the state of the art, focusing on basic phase change material properties, critical PCM device characteristics, PCM device scaling, reliability issues, and processing challenges.
The structural changes in copper samples (99.90% Cu) subjected to severe plastic deformation using a shock loading technique have been studied. The samples are extruded through two or three channels disposed at an angle of 90°. The microstructure of the copper samples changes under the simultaneous action of high-rate…
Nanocrystalline samples of ZnO doped with Fe2O3 were synthetized by wet chemical method. The series of ZnO nanosized samples in the wide range of Fe2O3 concentration (from 5 wt.% to 95 wt.%) was prepared by precipitation from nitrate solutions using ammonia. The phase composition of the samples was determined using X-…
Ethanol extract and its ethanol fraction from aerial parts of P. daemia exhibited significant hepatoprotective effect against CCl4 induced hepatotoxicity in rats. Glutamic oxaloacetic transaminase, glutamic pyruvic transaminase, alkaline phosphatase, total bilirubin, total cholesterol, total protein and albumin in ser…