Materials Literature
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Thermal expansion behaviors in a- and c-axes in quartz are formulated in terms of the rotational motions of the corner-linked rigid SiO4 units around the <100>hex and the expansion of the tetrahedral units. Collective transfer motions of atoms between the double-wells of potential energies, observed in a previous mole…
The preparation and crystal structures of the 1:1 TCNQF4 (tetracyanotetrafluoroquinodimethane) salts of two unsymmetrically substituted, fluorinated tetrathiafulvalenes, (2,2-difluorotrimethylenedithio)(ethylenedithio)tetrathiafulvalene (2) and (2,2-difluorotrimethylenedithio)tetrathiafulvalene (3) are described. A st…
This note describes an improved anodization apparatus that provides enhanced safety and efficiency, and is suitable for large-scale volume production. The improved anodization apparatus also provides increased electrolyte temperature control, and allows flexibility in the size and shape of the substrate. Overall, this…
The ability to predict the electrostatic propensity of textile systems has been an elusive goal for many years. Some small-scale test methods previously reported were found to be inadequate for certain conditions. One of the most serious problems is poor correlation between test measurements and the values of electros…
The synergetic effect of dimerized pentaerythritol esters, as novel costabilizer, with metal soap, the mixture of zinc and calcium stearates, as stabilizer, on the undesirable discoloration of poly(vinyl chloride) (PVC) by heating was investigated. The dimerized pentaerythritol esters were prepared by the esterificati…
The influence of synthesis temperature and target composition on electrophysical properties of ion-plasma deposited BaSrTiO3 films is investigated. The film growth parameters, which provide the sufficient combination of tunability and loss factor of planar capacitor for microwave application, are determined. That corr…
This module describes the general design, characteristics and parameters of TRIGA reactors and fuels. It is recommended that most of this information should be incorporated into any reactor operator training program and, in many cases, the facility Safety Analysis Report. It is oriented to teach the basics of the phys…
A modified catecholate process has been developed for the synthesis of high purity barium titanate fine powders. The barium titanium-catechol complex, Ba(Ti(C6H4O2)3) was prepared from TiCl4, C6H4(OH)2 and BaCO3. The complex was freeze-dried and calcined for 3 hours at temperatures ranging from 700 to 1100°C. Phase tr…
Synthesis of porous silicon nitride (Si3N4) by using seed crystals was studied. Seed crystals were prepared by heating a powder mixture of α-Si3N4 and sintering aids. Y2O3 was the most effective additive for obtaining seed crystals of high aspect ratio. By adding rod-like seed crystals to α-Si3N4 starting powder, poro…
Thermal stability of ~l l \ ~a c \ l l o ~ 7 1 8 -~~' and alloy 718 was evaluated by the change in microstructure and mechanical properties after long time thermal exposure. The tnajjor microstructural changes due to thermal exposure included -J" and y' particle gro~b-th. formation of a .J"-depletion zone. and occurre…
Preceramic polymer of Si-N(-C), perhydro-polysilazane (PHS), polyborosilazane (PBS) and methyl-hydropolysilazane (MHS), were synthesized by a pyridine-adduct method. The properties of polysilazanes were examined in relation to their potential application to the precursors of ceramic composites. PBS had too high viscos…
A mathematical model of a batch foam fractionation process has been developed based on analogies to a distillation model. The model is tested for the foam fractionation of the aqueous protein solution obtained from kudzu (Pueraria lobata) vine retting broth. This broth is most likely comprised of cellulases and pectin…
In this article, a series of O-2-[2-(2-methoxyethoxy)ethoxy]acetyl celluloses with different degree of substitution (DS) values was synthesized by a homogeneous reaction of cellulose with 2-[2-(2-methoxyethoxy)ethoxy]acetyl chloride in a 10% (w/w) dimethylacetamide/lithium chloride solution, combined with pyridine as…
Synthesis of nanometer-sized carbide powders using petroleum coke as carbon source during the mechanical alloying is explored. The synthesis procedure involves milling of petroleum coke powder with elemental Ti and Si powders, respectively. The measurement results of X-ray diffraction and BET indicated that cubic TiC…
The self-repairing reaction of polymer chains cleaved due to degradation was elucidated through the use of degradation poly phenylene-ether (PPE) related polymer composites. In the case where the cleavage of main chain partially occurred, a spontaneous re-bonding reaction proceeded at the chain ends with copper/amine…
Several interlaboratory tests according to ISO 5725 (1994) on polymeric materials using thermal analysis are presented. The results, especially repeatability and reproducibility data, are discussed. Thermogravimetric analysis (TGA) was used for the determination of carbon black, ash and plasticizer content in polymeri…
We outline a model to describe the rheology and the nonlinear response of layered materials. Explicitly, the focus is on cases wherein the system possesses internal states whose relative populations undergo a change upon the application of a stress. The objective of the model is to describe the mutual interplay betwee…
2-Dicyanomethylene-1,1,3,4,5,5-hexacyanopentene (DHCP) dianion, which had been reported as 2,3-bis(dicyanomethyl)-1,1,4,4-tetracyanobutadiene, was synthesized as a tetraalkylammonium salt from hexacyanobutadiene. The crystal structures of tetraalkylammonium (alkyl: methyl, ethyl), tetrathiafulvalene (TTF) and bisethyl…
This paper provides an overview of the current fiber world in terms of consumption of various fiber types worldwide. Further, it deals with the development of our modern concepts of fiber structure based on the original theories for natural cellulosic fibers. As an example of modern fiber science research, the paper c…
The formation of the microdroplets on fibres for the MDT test offers an opportunity to carry out surface tension measurements based on the angle of contact between the resin and the fibre. Liquid microdroplets of epoxy were deposited on glass fibres, and their diameter, length and cone angle were measured. The equilib…