Materials Literature
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Abstract A novel chitosan derivative, acryloyl chitosan (AcCs), and two N ‐maleoyl chitosans, MaCs‐1 and MaCs‐2, with different degrees of substitution were synthesized using completely deacetylated chitosan as raw material under different reaction conditions. AcCs is an amphiphilic chitosan derivative, but MaCs‐1 and…
In this study, the authors report atomic-resolution images that illustrate the transition from a crystalline Si3N4 grain across the interface into an amorphous Lu–Si–Mg–N–O glassy phase. The interface is not atomically abrupt, but is comprised of sub-nanometer-scale ordered regions that resemble a LuN-like structure.…
Abstract Summary: Poly(propylene glycol) oligomers with molecular weights ranging from 1 000 to 8 000 g · mol −1 were end‐functionalized with acetoacetate groups and subsequently crosslinked using carbon‐Michael addition with PEG diacrylate. Gel fraction analysis, DMA, TGA, tensile, and swelling measurements were util…
Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2006
Multiwalled carbon nanotubes were irradiated by 40keV Si ion beams with different doses, and the irradiation-induced structural transformation was characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The formation of amorphous carbon nanowire and carbon nanowire netw…
[Image: see text] We report on the low-pressure plasma immobilization, characterization and application of thin films of hyperbranched glycoacrylates, poly(3-O-acryloyl-alpha,beta-D-glucopyranoside) (AGlc), on PTFE-like fluorocarbon surfaces. This method is an efficient and versatile way to immobilize sugar-carrying b…
Abstract Summary: Novel hybrid polymer brushes with alternating dendritic wedge and linear chain as side chains were reported in this paper. Firstly, dendronized polymer initiators of generation one to three, G n MIBr ( n = 1, 2, 3), were synthesized through the alternating copolymerization of styryl dendrons and male…
Abstract Summary: Functionalized PP samples with different percentages of grafted IA, i.e., 0.7, 1 or 1.8 wt.‐%, with similar molecular weights were used as compatibilizers in PP/clay nanocomposites. PP nanocomposites containing 1 wt.‐% of organically modified clays, i.e., montmorillonite, natural hectorite and synthe…
Abstract Cotton fleece has become a popular fashion in recent years. However, most of the 100% cotton fleece fabric is not able to meet the federal flammability standard (‘ 16 CFR Part 1610: Standard for the Flammability of Clothing Textiles ’) without chemical treatment. In this research, we investigated the use of t…
Abstract The new compound (1,4‐dabH 2 )Ag 2 SnS 4 (1,4‐dab = 1,4‐diaminobutane) was prepared under solvothermal conditions and crystallizes in the tetragonal space group P4 2 /n with lattice parameters a = 14.7847(8) Å, c = 11.9087(6) Å, V = 2603.1(2) Å 3 , Z = 8. In the structure SnS 4 tetrahedra and AgS 3 triangles…
In diamond and zinc blende crystals, the competition between glide and shuffle-set slips has been intensively studied. In particular, the undissociated screw dislocation in Si seen at low temperature about five years ago was generally believed to be shuffle set. In this letter, the authors have performed tight-binding…
The authors demonstrate that by lowering deposition temperature of ZnMnO films (T<500°C) they can avoid Mn clustering and creation of inclusions of Mn oxides, which are frequently formed in ZnMnO layers grown by high temperature methods. Low temperature growth is achieved using atomic layer deposition and organ…
Abstract Raman spectra of starting (pristine) and functionalized multiwalled carbon nanotubes (MWNTs) were analyzed by principal component analysis (PCA) because the original Raman spectra showed very little differences between them. The nanotubes were functionalized with amines: dodecylamine (MWNT1), nonylamine (MWNT…
We have performed nuclear magnetic resonance (NMR) measurements on gallium confined in opal. In a cooling process, between 260 and $220\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, the NMR spectra of gallium in opal exhibit two separate peaks at $\ensuremath{\sim}122.579\phantom{\rule{0.2em}{0ex}}48$ (low frequency, LF) and…
Here the wetting of ionic and nonionic surfactant solutions on a superhydrophobic interface, obtained by using a mixed inorganic-organic coating providing a fractal-like structure, has been investigated to define the role of adsorption at these interfaces. The presence of the amphiphilic molecules is effective in lowe…
In this study, the authors demonstrate the ability to apply precise, conformal W coatings onto all surfaces of nanoporous carbon aerogels using atomic layer deposition (ALD). The resulting material has a filamentous structure in which the W completely encapsulates the carbon aerogel strands. The material mass increase…
Point contact Andreev reflection measurements of Co2Cr1−xFexAl Heusler alloys showed that the spin polarization P decreases with x from P=0.62 for x=0.0toP=0.54 for x=0.4 and then increases slightly to P=0.56 for x=1.0. The deviation in P of the samples with x=0.0 and 0.4 from the theoretical predictions (P>0.9…
This letter reports on the performance improvement of phase-change memory (PCM) cells by applying silicon-germanium (SiGe) alloys as resistive heating layers. The in situ doped polycrystalline Si0.75Ge0.25 films, lying under holes filled with a Ge2Sb2Te5 (GST) phase-change material in a pore-style configuration, promo…
Single crystals of TiO(2) rutile doped with Cr, Mn, Fe, Co, Ni, and Cu were grown with the flux method in a Na(2)B(4)O(7) melt. The samples, checked in their structural and phase homogeneity by x-ray diffraction and micro-Raman spectroscopy, were single-phase needle-shaped crystals several millimetres long. Paramagnet…
The effect of texture with (100) and (110) preferred orientations on dielectric properties of Ba0.6Sr0.4TiO3 (BST) thin films grown on SrO (9nm) and CeO2 (70nm) buffered Si substrates, respectively, was investigated. The coplanar waveguide (CPW) phase shifter using (100) oriented BST films on SrO buffered Si exhibited…