Materials Literature
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We demonstrate that dislocations in the graphene lattice give rise to electron Berry phases equivalent to quantized values ${0,\ifmmode\pm\else\textpm\fi{}\frac{1}{3}}$ in units of the flux quantum but with an opposite sign for the two valleys. An elementary scale consideration of a graphene Aharonov-Bohm ring equippe…
We have investigated a generally applicable protocol for a substrate-independent reactive polymer coating that offers interesting possibilities for further molecular tailoring via simple wet chemical derivatization reactions. Poly(methylsilsesquioxane)-poly(pentafluorophenyl acrylate) hybrid polymers have been synthes…
A comprehensive investigation of oxygen vacancy and interstitial diffusion in ZnO has been performed using ab initio total energy calculations with both the local density approximation (LDA) and the generalized gradient approximation (GGA). Based on our calculation results, oxygen octahedral interstitials are fast dif…
A counterintuitive observation of a faster signal relay over a longer linear distance prompted detailed kinetic studies of self-immolation reactions. With appropriate conformational bias, trigger-to-reporter signal transduction can take an efficient "shortcut" that outperforms conventional pathways involving repetitiv…
Liquid inclusion phenomenon of cyclotrimethylene trinitramine (RDX) crystals commercially produced (Hanwha-RDX as a conventional RDX and I-RDX as a reduced sensitivity RDX (RS-RDX)) and recrystallized by a cooling method was quantitatively analyzed by using matching refractive index/digital image analysis, scanning el…
Nanotubes made from a fibrillar protein, namely, collagen, were fabricated by a template-based method combined with layer-by-layer (LbL) deposition. The ability to incorporate collagen in LbL multilayered film was first demonstrated by in situ quartz crystal microbalance and ex situ ellipsometry on a flat model substr…
The piezoelectric coefficients ( d 33 , − d 31 , d 15 , g 33 , − g 31 , g 15 ) of soft and hard lead zirconate titanate ceramics were measured by the quasi-static and resonance methods, at temperatures from 20 to 300 °C. The results showed that the piezoelectric coefficients d 33 , − d 31 and d 15 obtained by these tw…
A leading contender for the pairing symmetry in the Fe pnictide high-temperature superconductors is extended s wave s_{+/-}, a nodeless state in which the pairing changes sign between Fermi surfaces. Verifying such a pairing symmetry requires a special phase-sensitive probe that is also momentum selective. We show tha…
Hydrogen embrittlement is believed to be one of the main reasons for cracking of structures under stress. High strength steels in these structures often include a ferritic core made of alpha-iron (body centered cubic lattice). We compute the interaction of atomic hydrogen with iron using first principles. The intersti…
Low-lying excitations in closed antiferromagnetic rings can be described in terms of rotational bands, which reflect the peculiar internal spin structure of the corresponding eigenstates. Here we use inelastic neutron-scattering measurements on the ${\text{Cr}}_{8}\text{Zn}$ molecule to investigate the validity of the…
An ultrasonically assisted two-step polyol process was established to prepare a novel ethylene glycol-based zinc alkoxide with octahedral morphology. The octahedral-shaped zinc alkoxide particles could be converted to ZnO by heating to 350 °C or above, without altering the octahedral shape. Interestingly, when exposed…
Novel thermoresponsive hybrid inorganic/organic thermosetting materials based on hydrophobic titanium dioxide nanoparticles and amphiphilic poly(styrene- b -ethylene oxide) block-copolymer-dispersed 4′-(hexyl)-4-biphenyl carbonitrile liquid crystals were prepared and characterized. The obtained results confirm that th…
Abstract Coordination of the 2,6‐bis(hydroxymethyl)pyridine‐based oxido pincer ligands RR′pydimH 2 [R = R′ = H (pydimH 2 ); R = R′ = Me (pydipH 2 ); R = 2‐tolyl, R′ = Me (pydotH 2 )] towards late transition metals Co II , Ni II , Cu II , Zn II , Pd II and Pt II allows the formation of molecular species (complexes), wh…
The free radical copolymerization of 1,3-bis( N, N, N -trimethylammonium)-2-propylmethacrylate dichloride (di-M) with acryloyloxyethyltrimethylammonium chloride (Q), diallyldimethylammonium chloride (DADMAC), and acrylamide (A) yielded novel polyelectrolytes and allowed for assessing the influence of the charge densit…
A cast AM50 magnesium alloy was plasma electrolytic oxidation treated in a silicate based electrolyte using a direct current power source. Plasma electrolytic oxidation coatings produced at four different visible discharge conditions were characterised for their microstructural features, composition, tribological beha…
A multinary molecular nanocluster, in which a T3 supertetrahedral [Sn(4)Ga(4)Zn(2)Se(20)](8-) core was neutralized and covalently terminated by four [(TEPA)Mn](2+) (TEPA = tetraethylenepentamine) metal complexes, was synthesized and characterized. The cluster is assembled into, through hydrogen bonding and van de Waal…
Perfectly hydrophobic (PHO) coatings consisting of silicone nanofibers have been obtained via a solution process using methyltrialkoxysilanes as precursors. On the basis of thermal gravimetry and differential thermal analysis (TG-DTA) and Fourier transform infrared spectroscopy (FTIR) results, the formula of the nanof…
CeF 3 and CeF 3:Tb 3+ nanoparticles were prepared by reverse microemulsion with a functional monomer, methyl methacrylate (MMA), as the oil phase, and CeF 3:Tb 3+ /poly (methyl methacrylate) (PMMA) nanocomposites were obtained via polymerization of the MMA monomer. The nanoparticles and nanocomposites have been well c…
Out on a limb: Sonogashira coupling of a suitable AB(2) monomer containing two iodine and one alkyne group forms a hyperbranched conjugated polymer that is studded with iodine end groups (see picture: I purple). These iodine groups are a perfect handle for convenient, efficient, and high-yielding post-functionalizatio…
Dense Cu-doped CaBi 4 Ti 4 O 15 ferroelectric ceramics have been fabricated by a conventional ceramic technique. After doping by Cu, the ceramics become denser, and their electrical, piezoelectric and pyroelectric properties are improved. At the optimum doping level of 0.5 mol%, the ceramic exhibits a high density (69…