Materials Literature
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Abstract Double‐grafted cylindrical brushes with poly(lauryl methacrylate) (PLMA) as the side chains were synthesized using the grafting‐from strategy via atom transfer radical polymerization (ATRP). The polyinitiator poly[2‐(2‐bromoisobutyryloxy)ethyl methacrylate] (PBIEM) with $\overline {DP} _{\rm n}$ = 240 and 1 5…
Long-circulating liposomes, such as PEG-liposomes, are frequently studied for drug delivery and diagnostic purposes. In our group, poly(amino acid) (PAA)-based coatings for long-circulating liposomes have been developed. These coatings provide liposomes with similar circulation times as compared to PEG-liposomes, but…
A synthetic route of potentially wide scope is reported herein for the organoimido functionalization of polyoxotungstates. This report focuses on the reaction between the monovacant lacunary polyoxotungstate, alpha-((n-C4H9)4N)4H3[PW11O39], and W(NC6H5)Cl4 in anhydrous acetonitrile. Evidence from 1H, 31P, 183W, and 1H…
Europium‐doped borophosphate glasses were prepared by the melt quenching method for application in light‐emitting diodes. Emission spectra and electron paramagnetic resonance were studied for the glass samples. The relative intensity ratio of Eu 2+ to Eu 3+ emissions is composition dependent, especially the B 2 O 3 /P…
Abstract Functionalized cubic Ia 3 d mesoporous silica (FCIMS) with glycidoxypropyl groups was prepared and characterized by powder XRD, N 2 adsorption, TGA, FT‐IR spectroscopy, solid state 13 C NMR spectroscopy and TEM, and studied as the support for the immobilization of Penicillin G acylase (PGA). The results show…
Abstract The charge transport properties of polymer matrix–carbon black composites are investigated in this study. Direct current conductivity is examined with varying parameters: the temperature and the conductive filler content. Conductivity data are analyzed by means of percolation theory, and both percolation thre…
Using electron spin resonance (ESR), the lattice position and dynamic properties of ${\mathrm{Mn}}^{2+}$ ions were studied in 0.5 and $2\phantom{\rule{0.3em}{0ex}}\mathrm{at.}\phantom{\rule{0.2em}{0ex}}%$ manganese-doped $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ ceramics prepared by the conventional mixed oxide method.…
Abstract The influence of starch carbamoylethylation upon the adhesion capability of starch to pure cotton, all polyester, and polyester/cotton blend fiber substrates were investigated. The carbamoylethyl starch was prepared by the reaction of starch with acrylamide in an aqueous dispersion. The capability was evaluat…
Abstract Substrate clamping and inter‐domain pinning limit movement of non‐180° domain walls in ferroelectric epitaxial films thereby reducing the resulting piezoelectric response of ferroelectric layers. Our theoretical calculations and experimental studies of the epitaxial PbZr x Ti 1– x O 3 films grown on single cr…
A new family of novel biodegradable poly(ether ester amide)s (PEEAs) consisting of three building blocks (L-phenylalanine, oligoethylene glycol, and aliphatic acid dichloride) were synthesized by solution polycondensation. Using N,N-dimethylacetamide as the solvent, these PEEA polymers were obtained with fairly good y…
Abstract It is puzzling that cellulose could be dissolved rapidly in 9.5 wt.‐% NaOH/4.5 wt.‐% thiourea aqueous solution pre‐cooled to −5 °C, but it could not be dissolved in the same solvent mixture without prior cooling. To understand this phenomenon, changes in the structure and properties of NaOH and thiourea in wa…
Efficient X-ray generation of relatively stable Sm2+ centers is observed in nanocrystalline Sm3+-activated BaFCl, as prepared by a one-step wet chemical reaction. The conversion efficiency is approximately 50,000 times higher than that in microcrystalline BaFCl/Sm3+ prepared at 900 degrees C. The Sm2+ centers, and hen…
We used x-ray tomography to characterize the geometry of all bubbles in a liquid foam of average liquid fraction ${\ensuremath{\phi}}_{l}\ensuremath{\approx}17%$ and to follow their evolution, measuring the normalized growth rate $\mathcal{G}={V}^{\ensuremath{-}1/3}\frac{dV}{dt}$ for 7000 bubbles. While $\mathcal{G}$…
Water accessibility of single wall carbon nanotubes (SWCNTs) can be monitored by resonant Raman spectroscopy (RRS) (see figure and cover) of the radial breathing modes of bile salt-solubilized CNTs. The RRS features of empty and water-filled CNTs can be very well resolved, and vibrational and electronic shifts and bro…
Magnetic nickel shells can be grown on gold nanorods with platinum tips by reduction of Ni2+ with hydrazine in aqueous cetyl-trimethylammonium bromide (CTAB) solution, using Pt tips as catalysts. The plasmon absorption of the starting gold nanorods can be totally quenched by the metallic layer of nickel, while the mag…
By sequential feeding of catalyst materials (see figure) it is revealed that the active growth sites are at the bottom of carbon nanotubes (CNTs), and that catalyst particles are constantly encapsulated into the CNTs (see figure). This gives a better insight into the mechanism of CNT formation and on ways to control t…
Biomorphic silicon carbide (bioSiC), a novel porous ceramic derived from natural wood precursors, has potential applicability at high temperatures, particularly when rapid temperature changes occur. The thermal conductivity of bioSiC from five different precursors was experimentally determined using flash diffusivity…
Eu-reka! Two neutral mononuclear europium enantiomers [Eu(tta)3L] and their thin films were prepared (tta=2-thenoyltrifluoroacetonate; L=(−)-4,5-pinene bipyridine (1), L=(+)-4,5-pinene bipyridine (2)). The ferroelectric measurements of the thin films show E–P hysteresis loops at room temperature (Tc=28.0 °C) with remn…
This article reviews surface grafting of star-shaped PEO. The use of star-shaped polymers is compared to linear PEO chains regarding the layer preparation and the ability of the resulting surfaces to resist protein adsorption. We then focus on the use of end-functionalized, star-shaped, PEO-based prepolymers that are…
Nanocrystalline tantalum and tungsten nitrides were synthesized by a two‐step ammonolysis reaction of transition metal chlorides. The first step involves ammonolysis of tantalum and tungsten chlorides at room temperature using anhydrous chloroform as the solvent. A second step consists of heat treatment of these as‐pr…