Materials Literature
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Polyaniline doped with camphorsulfonic acid (PANi-HCSA) and poly(3,4-ethylenedioxythiophene) doped with polystyrene sulfonic acid (PEDOT-PSSA) were electrospun separately to obtain individual nanofibers which were captured on Si/SiO 2 substrates and electrically characterized. The fiber resistance was recorded as a fu…
This study addresses the problem of dynamic strain localization in two steel alloys; HSLA-65 and DH-36 at elevated temperatures. It aims at understanding the adiabatic deformation of high strength structural steel by performing a nonlinear finite element (FE) analysis. A microstructural-based viscoplasticity model is…
Poly(ethylene terephthalate)/organo-montmorillonite (PET/OMMT) nanocomposites were melt-compounded using twin screw extruder followed by injection molding. N,N′-ethylenebis(stearamide) (EBS) was selected as a dispersing agent to improve the dispersibility and exfoliation of OMMT clay in PET matrix. Morphological prope…
Spinzustandsänderung: Ein neues molekulares Konzept wird beschrieben, das die Erzeugung von Magnetismus in wässriger Lösung unter dem Einfluss eines Analyten ermöglicht: Ausgelöst durch einen chemischen Reaktionspartner oder ein Enzym wird ein diamagnetischer Komplex in einen paramagnetischen Komplex umgewandelt (sieh…
Hot spots (HSs) between two nanoparticles (NPs) can be considered the canonical example of plasmonic coupling effects and are able to achieve huge enhancements of signals from molecules in fluorescence and Raman spectroscopy. In this work, it is found that these HSs between two NPs can be modeled as a superposition of…
Thermoplastic vulcanizates (TPVs) based on ethylene-vinyl acetate copolymer (EVA)/chlorinated polyethylene rubber (CPE)/nitrile butadiene rubber (NBR) blends were prepared by dynamic vulcanization, with the TPVs being reinforced by zinc dimethacrylate (ZDMA). Experimental results indicated that mechanical properties o…
The Journal of the National Science Foundation of Sri Lanka publishes the results of research in all aspects of Science and Technology. The journal also has a website at http://www.nsf.gov.lk/. 2021 Impact Factor: 0.682The JNSF provides immediate open access to its content on the principle that making research freely…
Subphthalocyaninatoboron complexes with six long-chain alkylthio substituents in their periphery are applicable for the formation of self-assembled monolayers (SAMs) on gold. Such films are prepared from solution with the axially chlorido-substituted derivatives and characterised by near-edge X-ray absorption fine str…
The mechanical and thermal behavior of small volume metallic compounds on the fast transient time are addressed in this work through developing a thermodynamically consistent nonlocal framework. In this regard, an enhanced gradient plasticity theory is coupled with the application of the micromorphic approach to the t…
The trends of magnetic coupling strength in Mn-doped III-V semiconductors are explained using a physically transparent band-coupling model, based on first-principles calculations. According to this model, the stability of the ferromagnetism in Mn-doped III-V semiconductors should increase with both the strength of p-d…
Synchrotron x-ray diffraction and absorption fine structure and Raman spectra on (Na,K)(Nb,Sb)O3-LiTaO3 ceramics suggested that the compositionally induced orthorhombic to tetragonal (O-T) ferroelectric phase transition is dominantly driven by A-site Li+ ions with a large [001] off centering, while B-site Nb atoms are…
We report a systematic study on the structural, electronic, magnetic, and ferroelectric properties of [111]-oriented BiFeO3/BiAlO3 (BFO/BAO) superlattice using density-functional calculations. It is found that the Fe-O-Fe superexchange interactions in BFO/BAO superlattice are greatly suppressed by the inserted BAO lay…
We propose a derivation of a nonequilibrium Langevin dynamics for a large particle immersed in a background flow field. A single large particle is placed in an ideal gas heat bath composed of point particles that are distributed consistently with the background flow field and that interact with the large particle thro…
The plasmon resonance-induced near electric field focusing and enhancement of three-layered silver nano-cylinder has been studied by quasi-static electricity. A field enhancement factor of more than 102 times can be obtained in the middle dielectric wall between the inner silver wire and outer tube around the resonanc…
The criteria for the formation of a C u A l O 2 reaction phase at the C u/ A l 2 O 3 interface are explored. Oxygen solutes up to 2 wt% were introduced into the copper first. The bonding was carried out at 1075°C. The reaction phase was observed only when the oxygen solute in copper before bonding was higher than 1.3…
The mechanical properties of a class of cellular material were measured. The composition of the material was progressively modified, while its pore structure was kept unchanged. Rigid foam, prepared from a thermoset resin, was gradually converted into reticulated vitreous carbon foam by pyrolysis at increasingly highe…
Cross laminated timber (CLT) has been an rising issue as a promising building material replacing steel-concrete in mid story rise construction. But, there was no specific standard for CLT because it had been developed in industrial section. Recently, new draft for requirements of CLT was proposed by EN which suggested…
Vector magneto-optical generalized ellipsometry is employed for the determination of the three-dimensional magnetization properties of magnetized thin solid as well as slanted columnar thin film samples. The permalloy thin films were probed by means of Mueller matrix ellipsometry at room-temperature while an external…
The possibility to use an ultra-fast laser operating at 1550 nm wavelength to induce intensity self-modulation in metal-insulator phase transition VO2 thin films was investigated. The results show that a self-modulation value upto 0.55 can be obtained by using z-scan method. In comparison, an externally triggered phas…
The ability of some liquids to vitrify during supercooling is usually seen as a consequence of the rates of crystal nucleation (and∕or crystal growth) becoming small [D. R. Uhlmann, J. Non-Cryst. Solids 7, 337 (1972)]--and thus a matter of kinetics. However, there is evidence dating back to the empirics of coal brique…