Materials Literature
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Abstract Die Chemie von expandierten Porphyrinen, den höheren Homologen der Porphyrine, wurde im Laufe der letzten drei Jahrzehnte ausgiebig untersucht. Expandierte Porphyrine weisen Strukturen, elektronische Eigenschaften, Reaktivitäten und ein Koordinationsverhalten auf, die sich gänzlich von denen der Porphyrine un…
Structural investigations by means of transmission electron microscopy (TEM) on ${\mathrm{K}}_{0.8}$Fe${}_{x}$Se${}_{2}$ and KFe${}_{x}$Se${}_{2}$, with 1.5 \ensuremath{\leqslant} $x$ \ensuremath{\leqslant} 1.8, have revealed a rich variety of microstructure phenomena. Materials with 1.5 \ensuremath{\leqslant} $x$ \en…
Monomer sequence is a potentially powerful but underutilized tool for the control of copolymer properties. Sequence is demonstrated to dramatically affect the hydrolysis profile for the degradation of poly(lactic-co-glycolic acid) (PLGA), a member of the most widely used class of biodegradable polymers employed in bio…
A porous and mat-like polyaniline/sodium alginate (PANI/SA) composite with excellent electrochemical properties was polymerized in an aqueous solution with sodium sulfate as a template. Ultraviolet-visible spectra, X-ray diffraction pattern, and Fourier transform infrared spectra were employed to characterize the PANI…
Cucurbit[n]urils (CB[n]) are macrocyclic host molecules with subnanometer dimensions capable of binding to gold surfaces. Aggregation of gold nanoparticles with CB[n] produces a repeatable, fixed, and rigid interparticle separation of 0.9 nm, and thus such assemblies possess distinct and exquisitely sensitive plasmoni…
Graphene (G) and atomic layers of hexagonal boron nitride (h-BN) are complementary two-dimensional materials, structurally very similar but with vastly different electronic properties. Recent studies indicate that h-BN atomic layers would be excellent dielectric layers to complement graphene electronics. Graphene on h…
The chemistry of expanded porphyrins, which are higher homologues of porphyrins, has been intensively explored for the last three decades. Expanded porphyrins exhibit structures, electronic properties, coordination chemistry, and reactivities that are entirely different from those of porphyrins. Through these studies,…
Abstract 1,2,3,4‐Butanetetracarboxylic acid (BTCA) was applied to crosslink amorphous regions of cotton‐type rayon fibers via anhydride‐mediated esterification for the purpose of a molecular‐level control over macroscopic properties. Formation of intrafiber crosslinked structures of the rayon fibers was a facile and e…
Abstract Differential scanning calorimetry (DSC) is used to determine the energy of activation and melting mechanism of PCL and of mixtures of PCL with the surfactant Span 80. The melting of poly(ε‐caprolactone) follows a nucleation and growth model with an Avrami exponent of 4. Addition of Span 80 reduces the energy…
Theoretical studies on BC(n) (n=1-6) clusters are carried out using density functional theory, Møller-Plesset second-order perturbation theory (MP2), coupled-cluster calculations including up to triple excitations (CCSD(T)), and higher-level approaches. All possible isomers depending on the positions of the boron atom…
We simulate quasistatic flows of an ideal two-dimensional monodisperse foam around different obstacles, both symmetric and asymmetric, in a channel. We record both pressure and network contributions to the drag and lift forces and study them as a function of obstacle geometry. We show that the drag force increases lin…
The `bond valence (s)-bond length (r)' correlation reported earlier for H-O bonds [Brown (2009). Chem. Rev. 109, 6858-6919] has been closely approximated using the function s = (α - βr)(1/γ), where α = 1.185 (10), β = 0.321 (8) and γ = 0.36.
The outdoor readability of the most popular portable liquid crystal display (LCDs) viz. fringe field switching has been addressed both in single and dual cell gap transflective devices. The devices use dual orientation, such as, homogeneous alignment in transmissive (T) part and 64° twisted alignment in reflective (R)…
In this review, which is mostly focused on the concepts and work developed in the author's laboratory, the access and properties of electron-reservoir (redox-robust) transition-metal complexes with sufficiently negative redox potentials and their branching to the tethers of dendrimers and other related nanodevices are…
We have investigated the preparation of titanosilicate mesoporous materials from both the self-assembly and the liquid crystal templating mechanisms. A fluorinated surfactant has been used as a template. Different amounts of titanium have been incorporated in the silica matrix. The Ti contents have been estimated by e…
Wet impregnation with phenolic resin and P-CVI methods were used to manufacture C/C composites. The influence of impregnation process of porous 2D carbon fibre substrate with resin and pyrocarbon deposited by CVD technique on mechanical properties of formed composites was studied. The results indicate that using P-CVI…
An effective Coulomb potential for metal nanostructures is calculated for the high frequency condition using a random-phase approximation where the many-body Coulomb interaction between conduction electrons is considered. The non-local dielectric function is derived for the effective potential – the poles of the poten…
Single-crystal neutron structural analyses have been performed on both potassium dihydrogen phosphate (KDP) and potassium dideuterium phosphate (DKDP) in order to discuss the isotope effect from structural viewpoints.The values of spontaneous polarization are calculated from the refined structural parameters by the po…
The amino acid sequence of collagen is composed of GlyXaaYaa repeats. A prevailing paradigm maintains that stable collagen triple helices form when (2S)-proline (Pro) or Pro derivatives that prefer the C(γ)-endo ring pucker are in the Xaa position and Pro derivatives that prefer the C(γ)-exo ring pucker are in the Yaa…
Abstract Amorphous silicon carbonitride films were produced by remote hydrogen plasma CVD (RP‐CVD) from Tris(dimethylamino)silane precursor. The effect of substrate temperature ( T S ) on the kinetics of RP‐CVD, chemical composition, structure, surface morphology, and properties of resulting films is reported. The T S…