Materials Literature
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Abstract Modified 26π rubyrin, 36π octaphyrin, and 54π dodecaphyrin systems have been synthesized in moderately good yields through acid‐catalyzed condensations of terthiophene diols and tripyrranes. The product distributions are decided both by the acid catalyst concentration and by the nature of the meso substituent…
Silicon wafers modified by silanisation with different functional groups are used to study the bioactivity of surfaces with varying physicochemical properties. Oxidation of the wafers created very hydrophilic surfaces, and moderately wettable surfaces were produced by coating with poly(ethylene glycol) (PEG). Immobili…
Through the execution of experimental investigation, thermogravimetry, X‐ray diffractometry, Fourier transform‐infrared spectrometry, transmission electron microscopy, and energy‐dispersive spectrometry, a variant reaction mechanism model was proposed for the solid‐state reaction between SrCO 3 and Al 2 O 3 /AlOOH for…
Surface treatment of polyester fabric was carried out using a vacuum ultraviolet (VUV) excimer lamp. The hydrophilicity of the polyester fabric was significantly improved by surface modification, as indicated by the decrease in wetting time and wicking time. This approach can be used to create added value for polyeste…
The single-crystal-to-single-crystal E --> Z photoisomerization of tiglic acid (2,3-dimethylacrylic acid) occurs in the supramolecular crystals CECR-HTA x 2MeOH x 1.5H(2)O (1) (where HTA = tiglic acid, CECR = C-ethylcalix[4]resorcinarene) with the preservation of the crystal lattice, indicating the ;scaffolding effect…
A two-step reaction sequence, dealumination via thionyl chloride followed by reaction with a Grignard reagent, has created a nanoscale morphology that appears as significantly roughened outer surfaces on zeolite 4A particles. X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) measurements revealed that…
We investigate the mechanism of heat conduction in ordered and disordered harmonic one-dimensional chains within the quantum mechanical Langevin method. In the case of disordered chains we find indications for normal heat conduction, which means that there is a finite temperature gradient, but we cannot clearly decide…
The substitution of scandium for iron in the Ruddlesden−Popper Sr 3 Fe 2 - x Sc x O 7 - δ ( x = 0−0.3) system increases tetragonal unit-cell volume and oxygen nonstoichiometry and decreases partial p- and n-type electronic conductivities studied in the oxygen partial pressure range from 1 × 10 - 20 to 0.7 atm at 973−1…
Epitaxial thin films of lanthanum nickel oxide Ruddlesden−Popper series (La n +1 Ni n O 3 n +1 ) have been prepared on different single-crystal substrates by metal organic chemical vapor deposition. Varying the La/Ni composition ratio in the precursor solution allows deposition of films with controlled La/Ni stoichiom…
Abstract Thermogelling poly(ε‐caprolactone‐ co ‐ D,L ‐lactide)–poly(ethylene glycol)–poly(ε‐caprolactone‐ co ‐ D,L ‐lactide) and poly(ε‐caprolactone‐ co ‐ L ‐lactide)–poly(ethylene glycol)–poly(ε‐caprolactone‐ co ‐ L ‐lactide) triblock copolymers were synthesized through the ring‐opening polymerization of ε‐caprolacto…
Abstract “Alligator clips” suitable for grafting on H‐terminated silicon or gold surfaces have been incorporated into single‐molecule magnets (SMMs) of the Fe 4 family. Tripodal ligands 2,2‐bis(hydroxymethyl)‐10‐undecen‐1‐ol (H 3 L 1 ) and 11‐(acetylthio)‐2,2‐bis(hydroxymethyl)undecan‐1‐ol (H 3 L 2 ) have been used to…
Spherical capsules of the type [{(Mo)Mo(5)}(12){Mo(2)(ligand)}(30)](n-) exhibiting 20 {Mo(9)O(9)} pores with crown ether functions allowed us to perform a sophisticated study of the title phenomenon based on synthetic work as well as NMR spectroscopy. The pores of the host system interact in solution specifically with…
To investigate phonon confinement in nanoscale metal dichalcogenides, we measured the low-temperature specific heat of layered and nanoparticle WS2. Below 9 K, the specific heat of the nanoparticles deviates from that of the bulk counterpart. Further, it deviates from the usual T 3 dependence below 4 K due to finite s…
Linear degradable polyurethanes were prepared and proposed for tissue engineering applications. Biocompatible segments were selected for the synthesis to promote their integration with the biological environment. Physicochemical and morphological characterization (SEC, DSC, DMTA, AFM) revealed that the properties of t…
Abstract The isothermal crystallization and subsequent melting behavior of poly(trimethylene terephthalate) (PTT) composites filled with nano‐CaCO 3 were investigated at designated temperatures with differential scanning calorimetry. The Avrami equation was used to fit the isothermal crystallization. The Avrami expone…
Abstract A set of linear [m,n]‐type polyurethanes was synthesized by polycondensation in solution from hexamethylene diisocyanate and 4,4′‐methylene‐bis(phenyl isocyanate) with alditols. Threitol, arabinitol, and xylitol bearing the secondary hydroxy groups blocked as methyl ethers were used. Either regioregular or no…
Polymer as an important component of polymer-dispersed liquid crystal film has great influence on the electro-optical properties. Polystyrene was prepared as a macro-RAFT agent in this study. Poly(methyl acrylate)-co-polystyrene was prepared in situ and used as polymer matrix in photopolymerization induced phase separ…
This paper presents a facile and effective nanoparticle synthesis approach based on aqueous sodium carboxymethylcellulose (CMC) solutions coupled with an organic phase extraction to yield dodecanethiol-capped Pt nanoparticle dispersions with narrow size distribution (using 0.15 wt % CMC in the system the average diame…
Indium tin oxide (ITO) substrates were modified with a layer of poly(amidoamine) (PAMAM) dendrimers to change their surface properties and, in particular, the substrates' work function. The functionalization procedure involved the electrostatic adsorption of positively charged PAMAM dendrimers of generation five onto…
Sb2S3 nanotubes with ultrathin walls (1.5-2.0 nm) were synthesized by the wet chemical method. The aspect ratios of Sb2S3 nanoribbons were controlled by a change of concentration of sulfur, which ultimately enabled the nanotubes to form.