Materials Literature
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DNA adsorption onto polypyrrole (PPy) powder particles has been monitored, ex situ , by X‐ray photoelectron spectroscopy (XPS) technique. DNA adsorption isotherms were determined by the quantitative analysis of the XPS spectra, and by plotting the X/N atomic ratios (X = C, O, Cl, P and Na) versus DNA equilibrium conce…
The formation of a new trigonal polytype of niobium disulfide, 1T-NbS2, is described from the atmospheric pressure chemical vapour deposition reaction of niobium pentachloride with hexamethyldisilathiane and tert-butyl disulfide at 400–600 °C; films were grown on glass and those deposited at 500–600 °C were crystallin…
We introduce a degenerate nonlinear parabolic system that describes the chemical aggression of calcium carbonate stones under the attack of sulphur dioxide. For this system, we present some finite element and finite difference schemes to approximate its solutions. Numerical stability is given under suitable CFL condit…
A multi-component white cast iron was developed for rolling mill rolls. The morphology and alloy concentration of carbides precipitated during solidification were investigated using X-ray diffraction, SEM, TEM and EDS analysis in the cast iron with typical chemical composition of Fe-2%C-5%Cr-5%V-5%Mo-5%W-5%Co (mass%).…
Formation of pitting at copper-contaminated sites on the silicon wafer surface during immersion in dilute hydrofluoric acid solution is elucidated by atomic force microscopy observations and electrochemical methods. It was discovered that the pit formation was promoted by the absence of light and hindered under illumi…
Silicon nitride (Si 3 N 4 ) has been obtained from the carbothermal reduction of rice husks by applying the constant‐rate‐thermal‐analysis (CRTA) method. Under this method, the reaction rate of carbothermal reduction can be controlled and at the same time the CO concentration generated is maintained constant at a prev…
An electroless deposition method has been employed for the synthesis of silver nanotubes using porous anodic aluminium oxide as templates, by which high-yield silver nanotubes with length over ten microns have been synthesized.
A new class of periodic mesoporous organosilicas (PMOs) with 4-phenyl ether and 4-phenyl sulfide bridge-bonded silsesquioxanes integrated into the pore walls to create ligand channels have been synthesized using inorganic salt-assisted self-assembly directed by a supramolecular polyoxyethylene (10) stearyl ether (Brij…
Abstract To examine the feasibility of whey protein isolate (WPI) coating as an alternative oxygen barrier for food packaging, heat‐denatured aqueous solutions of WPI with various levels of glycerol as a plasticizer were applied on corona‐discharge‐treated low‐density polyethylene (LDPE) films. The resulting WPI‐coate…
O presente trabalho tem por objetivo estudar o comportamento térmico e o mecanismo de decomposição térmica de compósitos de poliuretano nas proporções de: 5, 10 e 20%(p/p) de fibra de curauá. As amostras foram caracterizadas por técnicas de análise térmica (TG, DTG, DTA e DSC) e propriedades mecânicas (resistência à t…
The correlation $$(\bar a_2 + \bar a_3 ) = (\bar a_1 + \bar a_4 )$$ has been established for the mean parameters of the reduced perovskite unit cells, $$\bar a_1 ,\bar a_2 ,\bar a_3 $$ and $$\bar a_4 $$ of four arbitrary compounds with the perovskite structure having the compositions (1) ABX 3, (2) A′BX 3, (3) AB′X 3,…
Semi-empirical ZINDO SOS and ab initio quadratic response function (DDRPA) calculations on a series of donor–acceptor substituted π-conjugated chromophores based on styryl benzothiazoles are used to aid in the design of dyes with high non-linear optical properties. Structural modifications studied include nature and p…
Adiabatic calorimetry of water confined within nano‐pores of silica gel was carried out. The water within pores was classified into two parts, namely interfacial water and internal water. Water within 3 nm pores was well prevented from crystallization, and showed a heat capacity peak at 227 K and two glass transitions…
Foreword. Chapter 1. Introduction (B. Fultz). Chapter 2. Experimental Techniques and Instrumentation (R.F. Egerton). Chapter 3. EELS Quantitative Analysis (R.D. Leapman). Chapter 4. Energy Loss Fine Structure (P. Rez). Chapter 5. Energy Filtered Diffraction (L. Reimer). Chapter 6. EFTEM Elemental Mapping in Materials…
Excited-state dynamics and mechanisms of the rapid deactivation process of indigo carmine (InC) were investigated by means of femtosecond transient absorption spectroscopy and steady-state Raman spectroscopy. Solvent dependence of the excited-state lifetime revealed that intermolecular hydrogen-bonding with the solven…
In this paper, we report that novel multiwalled carbon nanotube (MWNT)/BaTiO3 nanocomposite ceramics were successfully fabricated via a hot-press sintering approach. Well dispersed MWNT–BaTiO3 composite powders were prepared by primarily synthesizing a new BaTiO3–MWNT hybrid material and then mixing it with tetragonal…
The properties of multi-functional CuCr and CuCrZr alloys with ultra fine grains (UFG) produced by equal-channel angular pressing (ECAP) have been investigated in dependence of concentration of alloying elements. A special attention is paid to optimization of fatigue performance together with strength, thermal and ele…
We first electrodeposited highly ordered nanowires using a home-made alumina template. Home-made nanoporous alumina templates were prepared by a two-step anodization method and selective removal of aluminum substrate by bromine solution. Chronopotentiometry ( i.e. , constant current method) of was applied to deposit c…
The synthesis and properties of a series of bi- and terthiophenes 3–8 substituted with meso-tetraphenylporphyrin (TPP) groups via an isolating oxaalkyl chain is described. Electrooxidative polymerization leads to the corresponding metal complexed porphyrin-functionalized polythiophenes P4–P8. The electrochemical and s…
A perylene derivative, n-(n-butyl)-n′-(4-aminobutyl) perylene-3,4,9,10-tetracarboxylic acid diimide (simplified as nBu-PTCD-(CH2)4-NH2) has been chosen as the target molecule for studies involving single molecule detection (SMD) using Raman scattering. The enhancement of the Raman signal is the result of the multiplic…