Materials Literature
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Abstract The effect of paper sludge's particle size and extrusion temperature on the physical and mechanical properties of paper sludge–thermoplastic polymer composites was investigated. In the experiment three levels of particle sizes for the paper sludge and four extrusion temperatures were designed to examine the p…
In this paper, the syntheses of a variety of substituted phenyl pyrenes 5a−n by Suzuki cross-coupling and of two decoupled analogues 10 and 17 are reported. These compounds have been investigated by fluorescence spectroscopy. The solvatochromism of their emission bands (Stokes shift) and the quantum yields in methylcy…
ABSTRACT: Modified atmosphere packaging (MAP) is increasingly used with minimally processed produce. Increased MAP usage coupled with negative environmental views associated with nondegradable synthetic packaging materials creates a need for biodegradable films. Zein films plasticized with oleic acid had been proposed…
Single crystals and ceramics of (1- x )PMN– x PT were synthesized in the whole concentration range from x =0 to x =1, and the temperature-concentration phase diagram of the system was determined from the dielectric measurement. The temperature dependences of the Raman spectra in the mixed crystals were measured. Raman…
Nanocrystalline α‐Al 2 O 3 ceramic powders have been prepared from an aqueous solution of aluminum nitrate and sucrose. Soluble Al ion‐sucrose solution forms the precursor material once it is completely dehydrated. Heat treatment of the dehydrated precursors at low temperature (600°C) results in the formation of porou…
Porous clay heterostructures (PCHs) with enhanced acidity may be prepared from suitably acid-activated montmorillonite clays; the higher acidity arises from Brønsted acid sites generated by acid treatment of the clay prior to its use as a host for PCH formation.
This paper reviews the current literature and describes issues related to using preceramic polymer precursors for joining ceramics for high‐temperature applications. In particular, the effects of precursor yield, temperature, and heating rate on the maximum stress due to shrinkage associated with conversion of precera…
A hybrid material with a conductive organic network in an inorganic matrix has been prepared by in-situ hydrolysis/polycondensation of TEOS in an aqueous solution of a solubilized polyaniline. Due to intense hydrogen bonding (indicated by 29Si NMR and FTIR) the conductive polymer is very well dispersed in the silica m…
Piezoelectricity in a charged cellular polypropylene, called EMFi, is investigated with respect to nonlinearities to explain the strong differences in longitudinal piezoelectric constants published in the literature and ranging from 90 to 250 pC/N. The inverse constant was measured interferometrically to be 90 pm/V. Q…
The oxidation behavior of a developmental amorphous SiBCN fiber was investigated. Fibers were heat‐treated in stagnant laboratory air at temperatures of 1300°–1500°C for 1 or 2 h. The oxidized SiBCN fibers contained three distinct concentric layers, each increasing in oxygen concentration from the core to the outer su…
The introduction of B atoms in SiOC glass networks has been achieved through the pyrolysis of sol‐gel‐derived polyborosiloxanes under an inert atmosphere. The starting gels were obtained from hydrolysis‐condensation reactions of triethylborate (B(OEt) 3 ) and an organically modified trialkoxysilane (EtSi(OEt) 3 ). The…
Transmission electron microscopy (TEM), electron diffraction (ED), and electron density maps (EDM) experiments were carried out on a poly[N-[3,4,5-tris(n-dodecan-1-yloxy)benzoyl]ethyleneimine] [poly[(3,4,5)12G1-Oxz]] with a degree of polymerization (DP) of 20. All experiments confirmed the thermotropic body-centered c…
This work investigated the possibility of using low-toxic corrosion inhibitors, instead of heavy-metal inhibitors, for CO 2 separation using aqueous solutions of monoethanolamine (MEA). The performances of eight low-toxic organic inhibitors (amines, carboxylic acid, and sulfoxide) were evaluated by conducting electroc…
The kinetics of DL-lactide polymerization was studied in CH2Cl2 and dioxane at 25°C and in toluene at 70°C with different aluminium Schiff's base initiators namely HAPENAlOMe, HAPENAlOiPr, 5-ClSALENAlOiPr and 5-ClSALOPHENAlOiPr. It was observed that HAPEN-type complexes derived from 2-hydroxyacetophenone lead to much…
The crystal structure of a mineral may be divided into two parts: (1) the structural unit , an array of high-bond-valence polyhedra that is usually anionic in character, and (2) the interstitial complex , an array of large low-valence cations, simple anions and (H 2 O) groups that is usually cationic in character. Int…
Many compounds with the spinel structure type have been analyzed for their thermoelectric properties. Published data was used to augment experimental results presented here and to select promising thermoelectric spinels. Compounds studied here include Cu0.5Al0.5Cr2Se4, Cu0.5Co0.5Cr2Se4, Cu0.5In0.5Cr2Se4, and CuIr2Se4.…
Crystallization behavior of Si‐C‐O glasses in the temperature range of 1000°–1400°C was investigated using transmission electron microscopy (TEM) in conjunction with electron energy‐loss spectroscopy (EELS). Si‐C‐O glasses were prepared by pyrolysis of polysiloxane networks obtained from homogeneous mixtures of trieth…
The structures of tomato 1-aminocyclopropane-1-carboxylate synthase (ACS) in complex with either cofactor pyridoxal-5'-phosphate (PLP) or both PLP and inhibitor aminoethoxyvinylglycine have been determined by x-ray crystallography. The structures showed good conservation of the catalytic residues, suggesting a similar…
Batch pyrolysis of polypropylene, polystyrene, and their binary mixture was carried out at temperatures of 350 and 420 °C. Two different loadings were also studied for neat polypropylene and polystyrene to assess the impact of total pressure, which was also a function of reaction time and temperature. For neat polypro…
OBJECTIVE: The use of fibrin gel, which can be produced from patients' blood, was investigated as an autologous, biodegradable scaffold. A new moulding technique was developed to create a complete aortic root. METHODS: A new moulding technique was generated for the creation of complete valve conduit. On the basis of b…