Materials Literature
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Electrospinning is a process used to produce ultrafine fibers with diameters in the nanometer range. Electrospun fiber mats have high potentials for biomedical uses, due to their high surface area and ease of drug incorporation into the fibers. They can be used as carriers for drug delivery and can enhance drug releas…
Role of the donor groups connected to the oxyallyl central moiety (suggested to be a powerful acceptor) has been emphasized in the literature for tuning the absorption maxima and obtaining large NLO activity in croconates and squaraine dyes which are oxyallyl derivatives. Here we have prepared a series of new croconat…
A series of ternary Ln(tta) 3 L complexes (Ln = Ho, Tm; Htta = 2-thenoyltrifluoroacetone; L = 1,10-phenanthroline, 2,2′-bipyridine, or triphenyl phosphate oxide) and their corresponding sol−gel hybrid materials formed via the in situ synthesis process (designated as Ln-T-L gel) were reported. The complexes and the gel…
We have performed first-principles calculations for body-centered tetragonal (bct) Si and Ge consisting solely of four-fold coordinated elements. The structural optimization has been carried out based on the local density approximation (LDA) in the density functional theory (DFT). For total-energy minimized structures…
Abstract Nitrogen‐doped tetrahedral amorphous carbon (ta‐C : N) films were deposited by filtered cathodic vacuum arc (FCVA) technique using nitrogen as a background gas. The structure of the ta‐C : N films was studied with X‐ray photoelectron spectroscopy (XPS) and Raman spectroscopy in terms of nitrogen flow rate use…
Den Hebel umgelegt: Ein photoinduzierter Elektronentransfer (PET) zwischen der Perylengruppe und der geschlossenen, nicht aber der offenen Form der Diaryletheneinheit charakterisiert den Prototyp eines optischen Speichers auf der Grundlage einer photochromen Diarylethen-Perylenbisimid-Diade (siehe Bild). Für Lesen, Sc…
We report growth, monolayer formation, and (electrical bistability and memory phenomenon) properties of hybrid core-shell nanoparticles. While inorganic quantum dots, such as CdS or CdSe, act as the core, a monolayer of ionic organic dye molecules, electrostatically bound to the surface of functionalized quantum dots,…
The local structural environment, and the spatial distribution of iron and aluminum ions in sodosilicate glasses with composition ${\text{NaFe}}_{x}{\text{Al}}_{1\ensuremath{-}x}{\text{Si}}_{2}{\text{O}}_{6}$ ($x=1$, 0.8, 0.5, and 0) were studied by high-resolution neutron diffraction combined with structural modeling…
Our objective was to develop a surface modification strategy for a titanium alloy (TiAl6V4) to provide thromboresistance for surfaces in rigorous blood-contacting cardiovascular applications, such as that found in ventricular assist devices. We hypothesized that this could be accomplished by the covalent attachment of…
Using a laser monitoring technique, the solubilities of carbamazepine (form III) in methanol, ethanol, 1-propanol, 2-propanol, tetrahydrofuran (THF), and 1-butanol were determined by the synthetic method from (275 to 343) K. A laser technique is used to determine the dissolution of particles. Results are correlated by…
Trinuclear Cu (II)-complexes of formula [Cu (II) 3(mu 3-E)(mu-4-R-pz) 3X 3] (+/- n ), E = O and OH; R = H, Cl, Br, CH(O) and NO 2; X = Cl, NCS, CH 3COO, and py, have been synthesized and characterized and the effect of substitution of terminal ligands, as well as 4-R-groups, in the one-electron oxidation process has b…
The luminescence efficiency of Mn4+-doped CaAl12O19 (Mn:CAO) is significantly improved by composition modification. The leading mechanism that quenches the Mn4+ photoluminescence is the formation of Mn4+ pairs in the lattice of CaAl12O19 (CAO) with interstitial O2- for charge compensation. Mixing Mg2+ ions into the CA…
The reaction between K 12[H 2P 2W 12O 48] and CuCl 2 in a NaCl aqueous solution assisted with organoamines (1,2-ethylenediamine (en), 1,6-hexamethylene diamine (hn), or both) leads to the isolation of three compounds: K 4Na 10[alpha 1-CuP 2W 17O 60(OH)] 2. approximately 58H 2O ( 1), Na 2[H 2en][H 2hn] 0.5[Cu(en) 2] 4.…
The objective of this work was to investigate the formation of hollow microcapsules composed of hyaluronic acid (HA) and poly(allylamine) (PAH) by layer-by-layer adsorption on CaCO 3 microparticles and subsequent core removal by addition of chelating agents for calcium ions. We found that the molecular weight of HA as…
We report the design of several elastomers based on the thermal polycondensation of α-ketoglutaric acid and one of three triols: glycerol, 1,2,4-butanetriol, or 1,2,6-hexanetriol. By varying the curing temperature and the duration of the curing process, a wide range of mechanical properties was achieved. The values of…
Abstract The synthesis and study of the photo‐ and thermoresponsive behavior of a series of novel trimesogens consisting of a diphenylbutadiene core linked to cholesterol moieties on either side via flexible alkyl chains are reported. These molecules possess the combined glass‐forming properties of bischolesterols and…
This work reports a comprehensive study about cell adhesion and proliferation on the surface of different electroactive substrates formed by pi-conjugated polymers. Biological assays were performed considering four different cellular lines: two epithelial and two fibroblasts. On the other hand, the electroactivity of…
We propose a framework for describing the impurity doping of semiconductor colloidal nanocrystals. The model is applicable when diffusion of impurities through the nanocrystal is sufficiently small that it can be neglected. In this regime, the incorporation of impurities requires that they stably adsorb on the nanocry…
Quantitative energy transfer from CdSe nanocrystals to a single, conjugated organic dye is observed in the system shown. The energy transfer can be modulated by altering the surface chemistry of the CdSe nanocrystal. The ability of one dye molecule to capture the exciton energy from a semiconductor nanocrystal effecti…
The present study is concerned with the structural and electronic properties of the TiO2/SnO2/TiO2 and SnO2/TiO2/SnO2 composite systems. Periodic quantum mechanical method with density functional theory at the B3LYP level has been carried out. Relaxed surface energies, structural characteristics and electronic propert…