Materials Literature
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The FTIR, Raman, UV‐Vis, 31 P MAS‐NMR, DTA, and refractive index measurements have been combined to investigate a series of glasses with the general formula 20Na 2 O–5Al 2 O 3 − x TiO 2 –(45− x )Nb 2 O 5 –30P 2 O 5 , 15≤ x ≤45. The glass structure, as well as thermal, optical, and chemical durability properties, were…
Poly(phenylene ethynylene)s were designed and synthesized that are completely soluble in nematic liquid crystalline solvents at molecular weights (GPC, relative to PS) of more than 100 000. These materials experience a chain extended rod conformation under these conditions with the polymer chains highly aligned with t…
In this article, using an atom transfer radical polymerization approach, for the first time polystyrene (PS) and polymethyl methacrylate (PMMA) were grafted covalently on boron nitride nanotubes (BNNTs). Then, a technique was developed to fabricate novel amorphous or graphitic carbon−BNNTs composites with a perfect ph…
Our civilization owes its most significant milestones to our use of materials. Metals gave us better agriculture and eventually the industrial revolution, silicon gave us the digital revolution, and we’re just beginning to see what nanomaterials yield. Updated to reflect the many societal and technological changes in…
Excitation transfer pathways in colloidal core/barrier/shell nanomaterials were investigated in the CdSe/ZnS/CdSe system. Absorption of light in the outer CdSe shell results in emission from the band edge of the CdSe core. The CdSe quantum shell acts as a light harvester that indirectly increases the brightness of the…
We compute the bulk and surface structures of glasses in the germanium–selenium (Ge–Se) system using Monte Carlo simulations and our previously derived set of ab initio potentials. We investigate the elastic response of the Ge–Se glasses under a flat “micro”‐indentation and incipient plasticity under a spherical nanoi…
A high‐purity CVD β‐SiC showed a relatively low corrosion rate in deoxygenated supercritical water at 500°C. The corrosion rate was lower than that previously reported for CVD SiC in 360°C water and much lower than that reported for sintered and reaction‐bonded SiC. The present study confirmed that CVD SiC was prefere…
What goes on within: A mesoscopic nanoporous dendrimer-like assembly of peptides hosts numerous nanometer-sized cavities that function as encapsulating sites. As an example, the assembly amplifies a single silver nanoparticle into many discrete nanoparticles of uniform size, and thus it acts as a polynanoreactor (see…
The reaction of mesoporous silica MCM-41 with various aminopropylsilanes was investigated. The distribution of grafted amino groups after submonolayer deposition from anhydrous toluene was probed by fluorescein labeling in conjunction with photoluminescence spectroscopy and pore size analysis. Monoalkoxysilanes genera…
Control over morphology and internal mesostructure of surfactant templated silicas remains a challenge, especially when considering scaling laboratory syntheses up to industrial volumes. Here we report a method combining emulsification with the evaporation-induced self-assembly (EISA) method for preparing spherical, m…
Pure bending of single-walled carbon nanotubes between (5,5) and (50,50) is studied using molecular dynamics based on the reactive bond order potential. Unlike smaller nanotubes, bending of (15,15) and larger ones exhibits an intermediate deformation in the transition between the buckled and fully kinked configuration…
Ringverengte Porphyrine: Die Titelverbindungen wurden auf einem Weg erhalten, bei dem Tripyrrolylboran als Templat für die Adler-Methode fungiert. Die Untersuchung belegt, dass die Subporphyrine zwar einige Porphyrineigenschaften behalten, die Ringverengung aber einen erheblichen Einfluss auf die elektronische Struktu…
From post to pillar: Non-disc-shaped molecules with pentafluorophenyl and trialkoxyphenyl groups linked by an ester junction self-organize into an ordered columnar superstructure in the mesophase by using arene–perfluoroarene face-to-face interactions.
We report on a series of chromophores that have been synthesized with a modulated conjugation path between donor and acceptor. Hyper-Rayleigh scattering measurements of the best molecule show an enhanced intrinsic hyperpolarizability that breaches the apparent limit of all previously studied molecules.
Nanofibrious composite poly(lactide-co-glycolide) (PLGA) and chitosan/poly(vinyl alcohol) (PVA) membranes were prepared by simultaneously electrospinning PLGA and chitosan/PVA from two different syringes. The in vitro degradation of PLGA and cross-linked composite membranes was examined for up to 10 weeks in phosphate…
Colloidal suspensions of copper oxide (CuO) nanoparticles were prepared by an alcothermal method, in which copper acetate was reacted with sodium hydroxide in the presence of acetic acid in ethanol at 78°C. The prepared suspension was stable for up to 1 month without stabilizers such as surfactants. Transmission elect…
Abstract The feasibility of a method based on ozonolysis and hydrogenation reactions for the production of polyols from unsaturated canola oil has been demonstrated. Polyol products with primary alcohol functional groups at position nine of each fatty acid ester in the original triacylglycerol have been produced from…
The effect of spin-orbit coupling and orbital polarization (OP) corrections on the spin and orbital magnetism of full Heusler alloys is investigated by means of local spin-density calculations. It is demonstrated that OP corrections are needed to explain the experimental orbital moments ${M}_{l}$. Model calculations e…
Relative frequencies of mechanically stable (MS) packings of frictionless bidisperse disks are studied numerically in small systems. The packings are created by successively compressing or decompressing a system of soft purely repulsive disks, followed by energy minimization, until only infinitesimal particle overlaps…
Attenuated total internal reflectance Fourier transform infrared, ATR-FTIR, spectroscopy was used to compare the water uptake and doping within polyelectrolyte multilayers made from poly(styrene sulfonate), PSS, and a polycation, either poly(allylamine hydrochloride), PAH, or poly(diallyldimethylammonium chloride), PD…