Materials Literature
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Five different processes were designed based on the polymerization time and water amount to investigate their influence on the properties of exfoliated nanocomposites synthesized by vinyl acetate (VAc) and montmorillonite-octadecyl trimethyl ammonium bromide (MMT-STAB). The violent stirring, low MMT-STAB content, high…
Self-healing (SH) technology of cracking is becoming a promising solution to improve the durability of cement based composites. However, little formula are available in the literature on determining the size and dosage of the self-healing capsules. Supposed that SH capsules will be broken and activated when they met c…
In this study, new complexes with formulae: Ce(4-bpy)(CHBr 2 COO) 3 ·H 2 O, Ln(4-bpy) 0.5 (CHBr 2 COO) 3 ·2H 2 O (where Ln(III) = Pr, Nd, Sm; 4-bpy = 4,4′-bipyridine) and Eu(4-bpy)(CHBr 2 COO) 3 ·2H 2 O were prepared, and characterized by chemical and elemental analyses, and IR spectroscopy. The way of metal–ligand co…
Svetlana Beloševića, Miorad M. Vasojevića, Marija S. Jeremića, Auke Meetsmab & Zoran D. Matovića* a Faculty of Science, Department of Chemistry , University of Kragujevac , Kragujevac , Serbia b Stratingh Institute for Chemistry and Chemical Engineering , University of Groningen , Groningen , The Netherlands * E-mail:…
Abstract This article reports the preparation of new anion exchange composite fibers (AECFs). These AECFs were prepared by simple stirring of polyacrylonitrile (PAN) and silica gel in different stoichiometric ratios. The physicochemical characterization of the prepared AECFs was characterized by Fourier transform infr…
순수한 점토 5 wt%를 포함하는 poly(vinyl alcohol)(PVA) 나노 복합체 필름을 수용액상에서 합성하였다. 합성된 PVA 복합체 필름에는 구조적으로 각각 다른 사포나이트(SPT), 몬모릴로나이트(MMT), 헥토라이트(SWN), 수용성 벤토나이트(PGV) 및 마이카(Mica) 등의 점토를 사용하였다. 이처럼 여러 가지 순수한 점토가 포함된 PVA 복합체 필름에 대해 열적-광학적 성질 및 모폴로지를 평가하였으며, 전자 현미경을 통해 관찰된 PVA 복합체 필름의 나노 구조에서는 점토가 매트릭스에 잘 분산된 부분도 있었지만, 일부에서는 뭉친 부분도 발견되었…
In this article, gold nanoparticles were synthesized by two bolaform cholesteryl imide derivatives with different lengths of ethyleneamine spacers at a liquid-liquid interface. By stirring the aqueous solution containing ions with the chloroform solution of bolaform amphiphile, ions were transferred into the organic p…
Corrosion is important reason for the deterioration of the bond between reinforcing steel and the surrounding concrete. Corrosion of the steel mainly depends on its microstructure. Smooth S220, ribbed S420 and S500 grade reinforcing steels were used in the experiments. Samples were subjected to accelerated corrosion.…
Polydiphenylamine and zeolite Y composite were fabricated and tested for the ability to detect the halogenated solvent vapors; dichloromethane, 1,2-dichloroethane, and chloroform. To enhance the sensing properties of the composites, zeolite Y was modified by the dealumination process. The sensitivity of the composites…
We compare different coarse-grained single-blob models for star polymers. We find that phenomenological models inspired by the Daoud-Cotton theory reproduce quite poorly the thermodynamics of these systems, even if the potential is assumed to be density dependent, as done in the analysis of experimental results. Using…
Abstract The rate constants of intramolecular double hydrogen transfer have been determined for of tert-butyl-substituted porphycenes: 2-tert-butyl-, 2,7-di-tert-butyl-, 2,7,12-tri-tert-butyl-, and 2,7,12,17-tetra-tert-butylporphycene using femtosecond pump-probe polarization spectroscopy. The rates increase monotonic…
High-order optical phonon modes in wurtzite ZnO and MgZnO nanocrystals were investigated using resonant Raman spectroscopy. The Raman modes in ZnO showed agreement with a harmonic model, consistent with prior work. MgZnO, in contrast, exhibited a large degree of anharmonic behavior. The strength of the anharmonicity i…
Using fluorescent fiber sensor in transformer PD detection is a new method, based on the experimental platform for corona PD defect, the study has been carried out in order to show the typical corona PD defect optical pulse signal characteristics, PD single pulse waveform and pulses under industrial frequency cycle we…
The paper presents computational fluid dynamics-based numerical simulation of the through-thickness air permeability of woven structures, applying the theory of jet systems. The flow through the interstices between the warp and weft threads is modeled as an “in-corridor”-ordered jet system, formed by nine jets, issuin…
Abstract A systematic ab initio investigation has been carried out to determine the structures, binding energies, and spin-spin coupling constants of ternary complexes X:HBO:Z for X, Z= LiH, HNC, HF, HCN, HCl, ClF, and HBO. All complexes X:HBO:Z are linear with C∞ v symmetry, except for HCl:HBO:Z and ClF:HBO:Z which h…
Nanoparticles have been used to improve the properties of many cosmetic products, mainly the sunscreens materials using nanoencapsulation or nanosuspensions, improving the contact with active molecules, enhancing the sun protection effect and facilitating formulations in industrial products. Microfluidic devices offer…
Functionally substituted sulfur-containing methanofullerenes have been synthesized by cycloaddition of diazothiotates and C60 fullerene in the presence of the three-component catalyst Pd(acac)2–2PPh3–4Et3Al. The sulfur-containing fullerenes as nanomodifiers for additives (0,005wt%) improve antiwear and EP (extreme pre…
The basic C60 and C70, and the higher fullerenes, mainly C76 and C84 were extracted with a series of different and previously unapplied solvents or combinations of solvents, by original advanced procedures, from the samples of carbon soot, produced in electric arc. The solubility of the basic and the higher fullerenes…
The coupling between a single emitter and surface plasmons in paired graphene layers and in paired graphene ribbons are studied. For paired graphene layers, the coupling between surface plasmons in graphene layers is strong at low photon energy and small gap between layers, which results in strong enhancement of the e…
The disulfide bond generation system in E. coli is led by a periplasmic protein, DsbA, and an integral membrane protein, DsbB. Here we present a solid-state NMR (SSNMR) study of a 41 kDa membrane protein complex DsbA/DsbB precipitated in the presence of native lipids to investigate conformational changes and dynamics…