Materials Literature
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Poly(aniline-co- o-anisidine) (P(An-co- o-As)) ionomers and poly(sodium 4-styrenesulfonate) (PSS) were layer-by-layer (LbL) assembled on carboxylic acid-functionalized multiwalled carbon nanotubes (MWNTs). The multilayered polyelectrolyte greatly enhanced the dispersibility and stability of MWNTs in aqueous solutions.…
Incorporation of semiconductor quantum dots (QDs) at high densities in polymer thin films is promising for the development of nanoscale sensors, light-emitting diodes, and photovoltaic devices. However, inhomogeneous distribution and aggregation of QDs in polymers limit the applications of QD−polymer composites. We in…
The potassium (K) status of 5 major soil types, under sugar beet cultivation for 35–40 years, and adjoining virgin lands were compared. Fifty-nine paired surface soil samples belonging to 24 soil series from the major sugar beet growing areas in Western Azarbaijan province located in the north-west of Iran were studie…
In this study, we developed the hydrogel patch containing curcuminoids for application in cosmetic purpose. The powder of curcuminoids extracted from rhizome of Curcuma longa Linn. was first formulated into o/w microemulsions before incorporating into the polymer solution. The polymer solutions consisted of chitosan d…
In this research, the effects of pre-fatigue on the dynamic and quasi-static tensile properties of laser welded butt joints between three kinds of steel plates, i.e. HR270, HR590 and HR780 steels, were investigated using tensile split Hopkinson bar apparatus. There were no significant effects of pre-fatigue on the dyn…
Steinberg-Guinan constitutive model is widely used in impact engineering simulations. Shock wave profile measurements of Al , Cu , and W under shock pressures ranging from 4 GPa to 200 GPa were analyzed, and shear modulus G and yield strength Y of these materials were obtained by using the high-pressure sonic velociti…
For the purpose of designing new functional silsesquioxanes (POSS), the structure and stability of the analogous compounds of the heavier group 14 and 4 elements such as germanium (Ge-POSS), tin (Sn-POSS) and zirconium (Zr-POSS) analogues of POSS were investigated and compared with those of the parent POSS and the tit…
Abstract Two unsaturated polyesters based on maleic anhydride, phthalic anhydride, and sebasic acid with each of linear 1,6‐hexanediol (PE L ) and cyclic 1,4‐cyclohexanediol (PE C ) were prepared. Their structures were characterized by IR and 1 H NMR spectra. Their composites were prepared by mixing different ratios (…
Abstract Two novel waterborne polyurethanes containing short fluoroalkyl groups [CH(CF 3 ) 2 and CH 2 CF 2 CF 3 ] were designed and synthesized. They were applied as surface modification agents on cotton fabrics. The treated cotton fabrics showed good water‐repellent properties, and the contact angles for water were…
(n)J(Se,Se) (n=1-4) nuclear couplings between Se atoms were analyzed by using molecular orbital (MO) theory as the first step to investigating the nature of bonded and nonbonded (n)J(Se,Se) interactions between Se atoms. The values were calculated by employing Slater-type triple xi basis sets at the DFT level, which w…
Tap to induce nanofiber growth: Mechanical force applied by a tapping AFM tip can break peptide nanofibers into active “seeds” for local growth of new nanofibers at liquid/solid interfaces (see AFM images). The combination of such an approach with certain solution conditions allows one to fabricate peptide-nanostructu…
The metal ion-promoted electron transfer occurs to all new dyads 1, 2, 3, and 4, even one of them, dyad 4, which has a rather weak electron acceptor unit. The results also indicate that the metal ion-promoted electron transfer within the dyads is influenced by the electron accepting abilities of quinone units; dyad 2…
While it is well-appreciated that the extracellular matrix plays a critical role in influencing cell responses, well-defined and reproducible presentation of extracellular matrix proteins poses a challenge for in vitro experiments. Films of type 1 collagen fibrils assembled on alkanethiolate monolayers formed at gold-…
A new solid solution of 0.99BaTiO(3)-0.01AgNbO(3) was prepared by a solid state reaction. Its structural, dielectric and ferroelectric properties were investigated. Besides the three phase transitions associated with pure BaTiO(3), the dielectric permittivity shows an additional peak around 100 °C. This peak exhibits…
One of the problems associated with photopolymers as optical recording media is the thickness variation during the recording process. Different values of shrinkages or swelling are reported in the literature for photopolymers. Furthermore, these variations depend on the spatial frequencies of the gratings stored in th…
The effect of polymer-polymer interactions on the miscibility of PVC/PMMA and PS/PMMA blends were studied in a broad composition range using viscosity and FTIR techniques. From the viscometric data, the presence of attractive forces among different polymers was evaluated according to Sun et al. (1990), by the determin…
Summary 31 P‐NMR spectroscopy on bulk soils is a powerful tool for the identification of the different phosphorus forms in soils and for the evaluation of the dynamics of soil P. Up to now the majority of the papers dealt with liquid state 31 P‐NMR spectroscopy on soluble soil organic substances. Only few papers were…
We experimentally show that, in contrast to the data having been collected so far, some single crystals of NaNbO(3) exhibit a dielectric permittivity of several thousand, at low T, and this value is saturated when approaching 0 K on cooling. Other sodium niobate crystals (having larger dielectric losses) present a fir…
Herein, we report the structural characterization and magnetic properties of the unique squarato-bridged-tricopper(II) complex, [Cu3(pmap)3(micro1,2,3-C4O4)](ClO4)(4).2H 2O (1), based on the tripod tripyridylamine ligand bis[2-(2-pyridyl)ethyl]-(2-pyridyl)methylamine (pmap). Each of the three copper centers is penta-c…
A fluorescent organic small molecule, hexaphenylsilole (HPS), has been used as a sensing material, while a HPS/polymethyl methacrylate composite film with a lotus leaf like structure is prepared by a simple electrospin method. The film shows high stability and excellent sensitivity for the metal ions Fe(3+) and Hg(2+)…