Materials Literature
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Shelf life of fresh fruits and vegetable depends on two variables namely respiration rate of commodity and permeability of t he packaging films. The modified atmosphere packaging using specially designed films acts as protective surface by controlling respiration of go ods and permeation simultaneously. Although there…
The fatigue durability of smooth and fancy flame cotton yarns was analysed with a Wohler’s curve. It was found out that the characteristic of fatigue durability of the curve mentioned determined for cotton fancy flame yarns enables the determination of the complete diagram of these curves. In turn, for smooth yarns a…
Terahertz (THz) electromagnetic waves share a few of the characteristics of optical and gigahertz waves, which makes them suitable for a number of interesting and new applications in imaging, spectroscopy, characterization, sensing and monitoring. Recently, there has been a huge interest in developing THz devices that…
Nano-dimensional powder of iron cobalt cyanide hydrate in silica matrix (member of Prussian-blue family) was obtained using ferric chloride, cobalt chloride, potassium cyanide and silica in their dilute solution through coprecipitation method. The crystal structures and surface morphology of nanoparticles were charact…
Laboratory experiments were performed to investigate the effectiveness of natural clay deposits as a potential low cost adsorbent for the removal of nickel (Ni) from wastewater. Two types of natural local clays deposits collected from Al-Mhawes Mountain, Al-Kharg prefecture and Khulais, Jeddah prefecture were examined…
The solvatochromic effect in methylene blue dye was studied with the effect of solvent polarity on the absorption spectra in Water, Methanol, Ethanol and Isobutanol by spectrophotometer. The absorption of methylene dye was recorded in solvents of different polarity. The results indicate that the value of λmax decrease…
In this work the peculiarities of oxygen vacancies formation in cerium oxide nanoparticles for different external influences have been investigated by spectroscopic methods. The features of oxygen vacancies and therefore non-stoichiometric cerium oxide formation in CeO2 nanocrystals depending on the atmosphere of high…
Palm-based polyols were synthesised via an alcoholysis process using K10 montmorillonite catalyst. The alcoholysis process was carried out by using epoxidised palm olein and isobutanol. The catalysing ability of K10 montmorillonite catalyst during alcoholysis process was investigated. The process factors affecting alc…
The aim of this research project was to investigate the mercerisation process of natural rapeseed straw used to manufacture composites with thermoplastic polymers. Alkali treatment of the native cellulose causes polymorphic transition to cellulose II and, consequently, improvement of mechanical properties of natural l…
In this research antimicrobial effects of silver nanoparticles (SNP, 33 nm) and silver nitrate (AgNO3) was evaluated on the vase life of Red Ribbon cut rose flowers. Pulse treatment was carried out with 50 mg L -1 SNP and AgNO3 with and without 5% sucrose and distilled water (DW) was used as a control treatment. After…
I t is becoming increasingly clear that nucleation processes in liquids and glasses are more complicated than previously thought, often coupling to other phase transitions and ordering processes. Experimental and theoretical studies show the development of icosahedral shortrange order in many supercooled transition me…
Extraordinarily high selectivity (80–93%) for the oxyfunctionalization of the terminal methyl group was discovered in the photocatalytic selective oxidation of dodecane with molecular oxygen in a continuous flow system under mild gas phase reaction conditions over mesoporous TiO2–SiO2 mixed oxide photocatalysts. The o…
In this contribution we present a study of the vacuum deposition process of metal/plasma polymer nanocomposite thin films monitored using plasma diagnostics (optical emission spectroscopy). We investigate the electrical properties of the nanocomposite structures suitable for their application as humidity sensors. Furt…
Template free electrochemical synthesis of crystalline polyaniline (PANI) nanopetals on copper and nanocrystals on zinc substrates has been carried out under optimized experimental conditions. The physico-chemical characterization of the as-deposited PANI nanostructures performed using Scanning Electron Microscope, Tr…
Pure Fe3O4 thin films and/or nanowires were selectively grown onto c-Al2O3 (0001) substrates in situ at different substrate temperatures using pulsed laser deposition (PLD). The epitaxial Fe3O4 thin films were grown at deposition temperatures that ranged from 300 to 600 °C, while nanowires with a single-crystalline na…
Esta revisión se dedica al ajuste de parámetros para modelos cinéticos de degradación térmica de polímeros usando termo gravimetría. Primero se describen los fundamentos del análisis de datos y se resumen las ecuaciones básicas. Luegol os modelos cinéticos se clasifican según estas categorías: isotérmicos, diferencial…
Influence of the growth temperature on the luminescence properties of Eu,Si-codoped AlN was studied by means of SEM, XRD and CL. The Si and Eu concentrations were fixed at 2.2 and 0.1 at%, respectively, while the growth temperature was varied from 1600 to 1950°C. The synthesized Eu,Si-doped AlN powders emit in the ult…
High specific heats of the magnetic regenerative material, at the temperatures lower than 20 K, is crucial for a regenerative cryocooler to reach a liquid-helium temperature. The hydrogenation of the magnetic regenerative materials ErNi and ErNi2 may change their structures, magnetic properties and specific heats, whi…
New p-tert-butyl thiacalix [4]arene derivatives containing simultaneously the 4-amidoazobenzene and ethoxycarbonyl fragments at the lower rim in cone and 1,3-alternate conformation of tri-and tetrasubstituted derivatives, correspondingly, were synthesized. It was shown that the replacement of the hydroxyl group by eth…
Chemical analyses conducted on the surface of rock slabs under a combination of two X-ray spectrometry methods, wavelength dispersive XRF and energy dispersive XRF, are used to establish a geochemical correlation between the studied samples. This proves to be an excellent method for the characterization of volcanic gl…