Materials Literature
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We used pulsed laser deposition to grow a series of ${[\mathrm{Ba}\mathrm{Ti}{\mathrm{O}}_{3}]}_{\ensuremath{\Lambda}∕2}∕{[\mathrm{Ba}{\mathrm{Ti}}_{0.68}{\mathrm{Zr}}_{0.32}{\mathrm{O}}_{3}]}_{\ensuremath{\Lambda}∕2}$ (BTZ∕BT) superlattices (SL's) with a modulation period $\ensuremath{\Lambda}$ that varies between $1…
Abstract A novel fluorinated diamine monomer with a keto group, 4‐[4‐amino‐2‐trifluoromethyl phenoxy]‐4′‐[4‐aminophenoxy]benzophenone (ATAB) was prepared by reacting dihydroxybenzophenone with 4‐chloronitrobenzene and 2‐chloro‐5‐nitrotrifluoromethylbenzene in the presence of potassium carbonate followed by catalytic r…
Coherent phonons were observed in ${\mathrm{SrTiO}}_{3}$ by using ultrafast polarization spectroscopy. The ultrafast dynamics and softening of phonon modes, which contribute to the structural phase transition at $105\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, are studied. The temperature dependences of the phonon frequenc…
We report the preparation of copolymer, poly(N-isopropylacrylamide)-co-(N,N'-methylenebisacrylamide) (PNIPAM-co-MBAA) nanotubes with different composite ratios through surface-initiated atom transfer radical polymerization using a porous anodic aluminum oxide membrane as a template. It is found that the tubular wall s…
We have performed density functional calculations for the structure and stability of Al(13)H(n) (n=1-13) clusters. Population analysis has shown significant charge transfer occurring from the Al cluster to the H atoms. The population for Al(13) varies from 0.24 (Al(13)H) to 2.83 (Al(13)H(13)). The shape of Al(13) moie…
Thermal conductivity $(\ensuremath{\kappa})$ of the Al-based Mackay-type $1∕1$-cubic approximants ($\ensuremath{\alpha}$-phase) was investigated over a wide temperature range from $2\phantom{\rule{0.3em}{0ex}}\mathrm{K}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}300\phantom{\rule{0.3em}{0ex}}\mathrm…
This study presents the synthesis of water-dissolvable sodium sulfate nanowires, where Na(2)SO(4) nanowires were produced by an easy reflux process in an organic solvent, N,N-dimethylformamide (DMF) and formed from the coexistence of AgNO(3), SnCl(2), dodecylsodium sulfate (SDS), and cetyltrimethylammonium bromide (CT…
Polyamide 6/polypropylene (PA6/PP = 70/30 parts) blends containing 10 wt% of ethylene octene copolymer (POE) and different loading (2–6 wt%) of organophilic modified monmorillonite (MMT, organocaly) are prepared using a twin screw extruder followed by injection molding. Polypropylene grafted maleic anhydride (PP-g-MAH…
A series of mononuclear square-based pyramidal complexes of iron containing two 1,2-diaryl-ethylene-1,2-dithiolate ligands in various oxidation levels has been synthesized. The reaction of the dinuclear species [Fe(III)2(1L*)2(1L)2]0, where (1L)2- is the closed shell di-(4-tert-butylphenyl)-1,2-ethylenedithiolate dian…
We present several modulated magnetic ordering models which all describe the high resolution neutron powder diffraction patterns of BiFeO 3 with the same accuracy as the circular cycloid one proposed in [J. Phys. C 15 (1982) 4835]. These orderings are: the elliptical cycloid and the spin density wave (SDW). The ambigu…
By using a chiral molecular motor as a dopant in a cholesteric liquid-crystalline film, fully reversible control of the reflection color of this film across the entire visible spectrum is possible. The large difference in helical twisting power between the two isomeric forms of the motor allows efficient light- and he…
Abstract Three novel hexanuclear core‐based hydroxidolanthanide coordination polymers [Ln 3 (BDC) 3.5 (OH) 2 (H 2 O) 2 ] · H 2 O [Ln = Y ( 1 ), Yb ( 2 ) and Er ( 3 ); BDC = 1,4‐benzenedicarboxylate] were prepared by the hydrothermal method. The controlled hydrolysis of lanthanide ions led to an open hexanuclear cluste…
“Nano-onions” with multifold alternating CdS/CdSe or CdSe/CdS structure have been synthesized via a two-phase approach. The influences of shell on photoluminescence (PL) quantum yields (QYs) and PL lifetimes are investigated and discussed. It is found that the outmost shell plays an important role in the PL QYs and PL…
This paper deals with the degradation processes occurring during polymer processing. Some general aspects of polymer processing are first recalled. Then, oxidation mechanisms and kinetics are evoked and the main processing methods are compared from this point of view. Temperature–molar mass maps allow to define a proc…
A novel nanoparticle−hydrogel assembly was made with a specially designed bile acid-derived thiol to stabilize Au nanoparticles. These particles have been found to stay dispersed in a polar medium in the presence of a bile acid-derived gelator.
A computational study of the electronic structure and magnetic properties of Gd pnictides is reported. The calculations were performed using a full-potential linear muffin-tin orbital method within the so-called $\mathrm{LSDA}+\mathrm{U}$ approach, which adds Hubbard-$U$ correlation effects to specified narrow bands i…
The charge-disordered three-dimensional uniaxial relaxor ferroelectric Sr0.61Ba0.39Nb2O6 splits up into metastable polar nanoregions and paraelectric interfaces upon cooling from above Tc. The frozen polar nanoregions are verified by piezoresponse force microscopy, respond domainlike to dynamic light scattering and di…
Effects of interactions with electrons on optical phonons are studied in an effective-mass approximation. The longitudinal mode with displacement in the axis direction is lowered in its frequency, while the transverse mode with displacement in the circumference direction is raised, in metallic nanotubes. The shifts ar…
Single-walled carbon nanotubes (SWNTs) have high surface area, high adsorption ability, and nanoscale interactions. In this study, capillary columns including SWNTs, ionic liquid (IL), and IL + SWNTs for GC were prepared. The separation results showed that SWNTs possessed a wide selectivity toward alkanes, alcohols, a…
The cold crystallization kinetics in ultrathin polymer films were analyzed by using spectroscopic techniques. The Dielectric spectroscopy (DS) used to monitor in real time the crystallization of ultrathin polymer films of PHB resulted that the thickness of the sample does not influence the change occurring in the amor…