Materials Literature
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The Y-α-SiAlON fine powders have been successfully synthesized from the system Y 2 O 3 −Al 2 O 3 −SiO 2, by using the gas-reduction−nitridation method. Completion of the nitridation was achieved at temperatures <1500 °C without unfavorable carbon contamination and SiC formation. While the presence of Y-containing inte…
The photophysical properties of a complex based on diphenylphosphanoethane (DPPE) fluorescent ligands linked to a europium ion have been investigated by different spectroscopic methods. Upon complexation with europium, the interaction of the phosphane oxide group with europium leads to a red shift of the absorption sp…
Graphite oxide synthesized using the Brodie method was tested for ammonia adsorption after two different levels of drying in dynamic conditions at the ambient temperature. Surface characterization before and after exposure to ammonia was done using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscop…
Three aluminium alkoxide complexes containing N(2)O(2) bis(phenoxy)-amine ligands were synthesized from reactions of the corresponding N(2)O(2) ligands with Al(O(i)Pr)(3) in toluene. Different amine side chains of the ligands included pyridine (1), CH(2)NMe(2) (2), and CH(2)NEt(2) (3). The related chloro aluminium ana…
Solid-state complexation of syndiotactic polystyrene (sPS) with a crown ether compound, 1,4,7,10-tetraoxa-cyclododecane (12-crown-4), took place when a film of sPS/chloroform clathrate was subjected to a guest exchange procedure assisted with a plasticizing agent. The new guest 12-crown-4 molecules were incorporated i…
The generation of compact quantum dots (QDs) probes is of critical importance for visualizing molecular interaction occurring in biological context, particularly when using the Förster resonance energy transfer (FRET) approach. This Article reports novel water-soluble compact CdSe/ZnS QDs prepared by ligand exchange r…
The polymer glass surface can be many orders of magnitude more mobile than the interior. We probe dynamics with reorientation of single dye molecules spin-coated onto polymer films. Rotation jumps in transition dipole orientation are observed for approximately 30% of all single molecules. It is found for the first tim…
We studied the unusual quantum Hall effect (QHE) near the charge neutrality point in high-mobility graphene sample for magnetic fields up to 18 T. We observe breakdown of the delocalized QHE transport and strong increase in resistivities ${\ensuremath{\rho}}_{xx},|{\ensuremath{\rho}}_{xy}|$ with decreasing Landau-leve…
SERS spectra of 1,10-phenanthroline (phen) on iron smooth surface doped with silver nanoparticles have been recorded and compared with those previously obtained on Ag doped smooth silver, copper and nickel surfaces. In order to correctly assign the SERS spectra, DFT/B3LYP calculations of phen and different models of p…
A new kind of bionanocomposites is prepared for the first time in soft conditions by a complex coacervation process and consists of an assembly of decavanadate polyanions and gelatin chains in triple helices and coils conformation. Before drying, well-defined homogeneous monoliths with a striking rubber-like behavior…
We present a method for fabricating close-packed two-dimensional colloidal crystals on a solid substrate via capillary forces mediated by the presence of a nearby oil–water interface. We demonstrate that the resulting crystals are soft and anneal defects rapidly, making this a facile and possibly scalable method of di…
Flexible and transparent silicon nanoparticle (Si-NP)/polymer composites possess high quantum yields and robust photostability for luminescence across the entire visible spectrum when stored in a variety of solvents and/or atmospheres. Moreover, the Si-NP/polymer composites in the form of films, fibers, tubes, and bow…
DFT calculations were carried out to study (183)W NMR chemical shifts in the family of the Keggin anions with formula alpha-[XW(12)O(40)](q-) (X=B, Al, Si, P, Ga, Ge, As, Zn), in the beta- and gamma-[SiW(12)O(40)](4-) geometric isomers, in the derivative Dawson anion [P(2)W(18)O(62)](6-), and in the most symmetrical L…
Here we report a scalable colloidal templating approach for producing metal half-shells as efficient surface-enhanced Raman scattering (SERS) substrates. Nonclose-packed monolayer colloidal crystals created by a spin-coating technology are used as structural template to fabricate both water-dispersed half-shells and d…
This paper reviews recent results in the field of chemical modification of wood with linear chain anhydrides. Though the main focus is on work performed by the author, this is described in the context of related progress in the field. The combined research has demonstrated the effectiveness of chemical modification ap…
Abstract Over the past few decades liposomes, which are lipid vesicles useful for the controlled release of numerous bioactive compounds, have attracted significant industrial interest. Several techniques have evolved for the manufacture of liposomes on a small scale. However, production on a commercially feasible sca…
Surface energies are an important factor in determining surface reactivity, sintering, and transformation, yet, until recently, there have been few direct measurements for rock-forming mineral phases. Using calorimetric methodology we developed and first applied to aluminum and iron oxides, we present here the first d…
The proposition has been made and is now gaining popular acceptance that electron energy-loss spectroscopy (EELS) attached to a transmission electron microscope (TEM) can be used to semiquantitatively measure H in minerals-specifically, that there is a pre-peak to the O K edge near 530 eV whose intensity is a measure…
Abstract Poly(ethylene terephthalate) (PET) sheets of different crystallinity were obtained by annealing the amorphous PET (aPET) sheets at 110°C for various times. The peaks of enthalpy recovery and double cold‐crystallization in the annealed aPET samples with different crystallinity were investigated by a temperatur…
Abstract The synthesis, functionalization and assembly of metal oxide nanoparticles BaTiO 3 and CoFe 2 O 4 is presented. The ferroelectric (BaTiO 3 ) and ferromagnetic (CoFe 2 O 4 ) oxide nanoparticle surfaces are directly functionalized via the anchoring of phosphonic acid and aminosilane molecules that engender the…