Materials Literature
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Nanoscaled Y 3 Al 5 O 12 :Ce (YAG:Ce) particles prepared through a coprecipitation method and heated to elevated temperatures were treated in different weights with tetraethyl orthosilicate at room temperature for surface coating. The IR absorption measurements attested to the presence of silica in YAG:Ce by a broad a…
Our recent work showed there existed a composition window for mixed Langmuir monolayers of homopolystyrene (h-PS) and a symmetric diblock copolymer polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) to form necklace-network structures at the air/water interface. In order to study further the possible mechanism and co…
The nucleotide composition of key enzymes involved in medium-chain-length polyhydroxyalkanoates (mcl-PHA) synthesis was analyzed in two newly isolated strains of Pseudomonas. The isolated strains were tested for their abilities to synthesize polyhydroxyalkanoates using three different substrates as a carbon source: so…
The complex interplay between the electron and lattice degrees of freedom produces multiple nearly degenerate electronic states in correlated electron materials. The competition between these degenerate electronic states largely determines the functionalities of the system, but the invoked mechanism remains in debate.…
Abstract Ammonia borane (AB) is a promising hydrogen storage material as it contains 19.6 wt % hydrogen. In this article, our recently developed hydrothermolysis approach to release hydrogen is studied over a wide range of AB concentrations (6–88 wt %), at pressure 14.7 and 200 psia, and temperature 85–135°C. It is sh…
In ordinary semiconductor bilayers, exciton condensates appear at total Landau-level filling factor nu{T}=1. We predict that similar states will occur in Bernal stacked graphene bilayers at many nonzero integer filling factors. For nu{T}=-3, 1 we find that the superfluid density of the exciton condensate vanishes and…
We have discovered a new iron pnictide oxide superconductor (Fe 2 As 2 )(Sr 4 (Mg, Ti) 2 O 6 ). This material is isostructural with (Fe 2 As 2 )(Sr 4 M 2 O 6 ) (M = Sc, Cr, V), which were found in previous studies. The structure of this compound is tetragonal with a space group of P 4/ nmm and consists of the anti-flu…
A hydrotropic agent, salicylic acid (SA), was grafted to chitosan oligosaccharide (CSO) backbone to develop a CSO/SA conjugate. The CSO/SA self-assembled to form nanoparticles (NPs) in aqueous medium. The sizes of the NPs were smaller as more SA was grafted and when lower molecular weight CSO was used. The ζ-potential…
The influence of surface hydroxylation on nucleation and sintering of gold nanoparticles was studied by comparison of Au deposition and thermal sintering on ideally terminated MgO(001) and hydroxylated MgO thin films, respectively. A combination of different spectroscopic techniques (TDS, XPS, IRAS) allows to establis…
Spin-coating of chalcogenide glass is a low-cost, scalable method to create optical grade thin films, which are ideal for visible and infrared applications. In this paper, we study the influence of annealing on optical parameters of As(2)S(3) films by examining UV-visible and infrared spectroscopy and correlating the…
Nanofabrication by molecular self-assembly involves the design of molecules and self-assembly strategies so that shape and chemical complementarities drive the units to organize spontaneously into the desired structures. The power of self-assembly makes it the ubiquitous strategy of living organized matter and provide…
The charge distribution in RFeAsO1-xFx (R=La,Sm) iron pnictides is probed using As nuclear quadrupole resonance. Whereas undoped and optimally doped or overdoped compounds feature a single charge environment, two charge environments are detected in the underdoped region. Spin-lattice relaxation measurements show their…
The industrial application of kaolinite is closely related to its reactivity and surface properties. The reactivity of kaolinite can be tested by intercalation; that is, via the insertion of low-molecular-weight organic compounds between the kaolinite layers resulting in the formation of a nano-layered organo-complex.…
We report the characterization of the frontier orbital energies and interface dipole effects for bare and ligand-capped 3.6 and 6.0 nm diameter CdSe nanocrystals (NC) tethered to smooth gold substrates, using He(I) and He(II) UV photoemission spectroscopy. Changes in the ionization potential (IP) of the NCs and local…
Boron nitride forms nearly perfectly regular films with a thickness of precisely one atom on various metal surfaces. Here, we follow the formation of boron nitride layers on Rh(111) with scanning tunneling microscopy (STM) under realistic growth conditions, up to 1200 K. Our STM movies demonstrate in detail how the st…
Os polímeros representam uma das classes de materiais mais versáteis disponíveis para aplicações em diversas áreas, inclusive a farmacêutica. Polímeros naturais, naturais modificados e sintéticos são empregados como excipientes farmacêuticos para a formulação de cosméticos e medicamentos de liberação convencional e de…
The interactions between zirconia (ZrO 2 ) powder and three Algerian hydrated kaolinitic clays were studied at high temperatures. The analysis by X‐ray diffraction of the prepared products allowed to follow the different phase developments during heat treatment and to identify the parameters controlling the zirconia c…
Chemical biology aims for a perfect control of protein complexes in time and space by their site-specific labeling, manipulation, and structured organization. Here we developed a self-inactivated, lock-and-key recognition element whose binding to His-tagged proteins can be triggered by light from zero to nanomolar aff…
Highly biocompatible luminescent superparamagnetic nanocomposites have been synthesized from Fe 3 O 4 /SiO 2 −QDs (IQ). Fe 3 O 4 nanoparticles coated with a silica shell, Fe 3 O 4 /SiO 2 (IOS), and water-soluble CdSe−ZnS quantum dots (QDs) were assembled together by the conjugation of an SH group. X-ray diffraction (X…
Magnetoresponsive smart capsules formed with polyelectrolytes, lipid bilayers and magnetic nanoparticles were fabricated by a colloid-templating technique. Melamine-formaldehyde core particles with polyelectrolyte multilayer shell were prepared by layer-by-layer assembly. Magnetite (Fe(3)O(4)) nanoparticles were selec…