Materials Literature
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The optical properties of ZnO/Mg 0.1 Zn 0.9 O single quantum wells with graded well width were studied using temperature-dependent photoluminescence (PL) spectroscopy. The ratio of emission intensity between the well and barrier layers was found to increase monotonically when the sample temperature was increased from…
Hematoporphyrin ( 1 ), the first compound that was tried in photodynamic therapy (PDT), contains, besides the basic porphyrin ring, two carboxyethylene groups. Photofrin, currently the most frequently used porphyrin-type compound in anticancer therapy, was obtained from hematoporphyrin ( 1 ) (Fig. 1 ) [ 1 ]. Photofrin…
Composite is a combination of a reinforcing material within a matrix material that act together to provide enhanced properties unobtainable in either single material. Often the matrix provides protection from damage and gives mechanical stability to the reinforcement under loading; at the same time the reinforcement c…
Abstract Nanoparticles of polypyrrole (PPy) in 40/60 wt % natural rubber (NR)–polystyrene (PS) blends were synthesized by emulsion polymerization using ferric sulfate [Fe 2 (SO 4 ) 3 ], sodium dodecyl sulfate (SDS), and n ‐amyl alcohol as the oxidant, surfactant, and cosurfactant, respectively. The NR/PS/PPy blends we…
In this paper we report on the growth and structural characterization of very thin (20 nm) Cr-doped ITO films, deposited at room temperature by double-target pulsed laser ablation on amorphous silica substrates. The role of Cr atoms in the ITO matrix is carefully investigated with increasing doping content by transmis…
Abstract In this research, the rheological properties of electron beam irradiated polypropylene homo polymer (PP) containing Polybutene (PB) resin and Trimethylol Propane Trimethacrylate multifunctional monomer is studied. The effect of PB resin in inducing long chain branches on the PP backbone are evaluated by vario…
We show frequency-dependent dielectric permittivity and dielectric polarization fluctuation measurements of liquid and glassy glycerol. This allows a direct comparison of both quantities determined independently. After cooling the glycerol sample to 179 K with a cooling rate of 0.85 K/min we studied the aging time dep…
Abstract Silole‐core phenylacetylene dendrimers were designed and synthesized, among them, the model compound ( n = 0) and the first generation of the dendrimer ( n = 1) were obtained by the reaction of 2,5‐dibromosilole with corresponding terminal alkynes, the second generation of the dendrimers ( n = 2) was synthesi…
In 1951, the notion of anti-ferroelectricity based on the phenomenological theory was firstly proposed by C. Subsequently, a double hysteresis (P-E) loop and a ferroelectric-antiferroelectric (FE-AFE) phase transition were observed in PbZrO 3 Since then, the double hysteresis loop, one important macroscopic effect, ha…
Magnetoelectric (ME) multiferroics are materials in which ferromagnetism and ferroelectricity occur simultaneously and coupling between the two is enabled. Applied magnetic field H gives rise to an induced polarization P which can be expressed in terms of magnetic field by the expression, P= H, where is the ME-suscept…
Abstract Plasticized corn flour‐based materials were prepared by extrusion and injection molding. Extrusion of corn flour blends (75% wet basis (wb)—glycerol (5 or 10% wb)—water) was performed in a twin‐screw extruder with either one or three shearing zones. Native corn flour is mainly composed of corn starch granules…
Experiments were carried out at the Faculty of Food Technology of Latvia University of Agriculture (LLU). Soft cheese Kleo produced in Latvia was packed in a biodegradable PLA without barrierproperties and VC999 BioPack lidding film PLA, coated with a barrier of pure silicon oxide (SiOx) and in combination with modifi…
This article represents a systematic review of the behaviour of B-site multi-element doping effect on electrical property of bismuth titanate ceramics. Bismuth titanate, Bi 4 Ti 3 O 12 (BIT) is a potential candidate for high-temperature device applications due to their high dielectric constant, Curie temperature (T c…
Ceramics and metals are two of the oldest established classes of technologically useful materials. While metals dominate engineering applications, ceramics are used extensively to provide thermal and electrical insulation and are emerging as important structural materials. Properties of individual ceramics and metals…
Abstract Composites of high density polyethylene (HDPE) with the reinforcements of glass fiber (GF) and wood flour (WF) have been studied in this work. High‐density polyethylene‐grafted maleic hydride (HDPE‐ g ‐MAH) was used as a compatibilizer. In particular, the effect of GF, WF, and HDPE‐ g ‐MAH on the overall prop…
Abstract The melt rheological behavior of neem bark flour (BF) filled high density polyethylene (HDPE) has been studied at varying volume fraction (ϕ f ) from 0 to 0.26 at 180, 190, and 200°C in the shear rate range from 100 to 5000 s −1 using extruded pellets of the composites. The melt viscosity of HDPE increases wi…
Crystallographically oriented triangular or hexagonal Au rings with micrometer-scale edge lengths and nanoscale thicknesses are successfully synthesized in aqueous solution. By using a Au3+ precursor and commercially available neutral polymeric surfactant ((C2H4O)23C12H25OH, Brij35), Au rings are generated in a single…
Abstract Organic/inorganic nanohybrid materials composed of terthiophenes and imogolite were prepared by means of specific surface interaction between a phosphonic acid group in terthiophene derivatives and aluminol groups on the surface of imogolite. The new materials were investigated by FTIR, UV–vis absorption, flu…
ABSTRACT A new separation technique, called stripping crystallization (SC), is applied here in the purification of the cresol isomer. Basically, SC combines distillation and crystallization to produce pure crystals because of the three‐phase equilibrium. The experiments show that the SC operation can be applied to pur…
Abstract The effect of homopolymer (hP) addition on the structure formation in lamellar amorphous block copolymers (BCP) with narrow‐ and broad‐molecular weight distribution (MWD) was studied using small‐angle X‐ray scattering and transmission electron microscopy. The systems in our study consist of blends of a poly(s…