Materials Literature
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A transparent periodic structure consisting of metamaterial (double negative) layers and matching (single negative material) layers is presented. Through the calculation of the band structure and transmission spectrum, this kind of structure is found to be omnidirectionally transparent to some electromagnetic wave of…
All that glitters is not gold: A powerful computational approach using density functional theory and kinetic modeling leads the field of nanoparticle catalysis into a new era. Not only gold exhibits unique properties on the nanoscale, but also other noble and transition metals should show similar effects for a variety…
Verdrillte Fasern mit helicaler Struktur bilden sich aus chiralen Polyoxomolybdaten (POMs) [(R*PO3)2Mo5O15]2− (R=CH3CH(NH3), CH3CH(CH3)CH(NH3)) durch H-Brückenbildung. Hochaufgelöste TEM-Bilder einzelner Fasern zeigen eine geordnete Unterstruktur mit parallelen Reihen von ca. 2 nm Breite, in Einklang mit der röntgenog…
Here we report for the first time that proteins can function as unique reducing agents to produce gold nanoparticles from gold salts. We demonstrate that three different proteins, namely, bovine serum albumin (BSA), Rituximab (RIT--an anti-CD20 antibody) and Cetuximab (C225--anti-EGFR antibody), reduce gold salts to g…
Abstract Solution electrospinning was used for the first time to prepare nanofibers of the stable (α) and metastable (β) complexes between poly(ethylene oxide) (PEO) and urea. Both types of fibers were highly crystalline and presented a large level of molecular orientation. Detailed characterization of the ill‐studied…
We demonstrate some interesting phenomena associated with a nonmonochromatic plane wave passing through a spherical invisibility cloak whose radial permittivity and permeability are of Drude and Lorentz types. We observe that the frequency center of a quasimonochromatic incident wave will suffer a blueshift in the for…
We report in this article a new versatile surface-initiated ethylene “living” coordination polymerization technique for “grafting from” surface functionalization of silica nanoparticles with narrow-distributed branched polyethylene brushes of controllable length. The key to the success of this technique is the use of…
We study gel formation in a mixture of equally-sized oppositely charged colloids both experimentally and by means of computer simulations. Both the experiments and the simulations show that the mechanism by which a gel is formed from a dilute, homogeneous suspension is an interrupted gas-liquid phase separation. Furth…
We present a numerical study of the spectral variations of localized surface plasmon resonances (LSPR) in a 3D-probe metallic nanoparticle scanned over an inhomoegeneous dielectric surface. The possibilities for both, index monitoring and lateral resolution at nanoscale level are explored, with special attention paid…
Four new quaternary alkali neodymium thiophosphates K 9Nd[PS 4] 4 ( 1), K 3Nd[PS 4] 2 ( 2), Cs 3Nd[PS 4] 2 ( 3), and K 3Nd 3[PS 4] 4 ( 4) were synthesized by reacting Nd with in situ formed fluxes of K 2S 3 or Cs 2S 3, P 2S 5 and S in appropriate molar ratios at 973 K. Their crystal structures are determined by single…
When long thin flexible solid objects, such as the legs of water striders, disposable spoons and human hairs, are pressed against a liquid surface, they bend due to interfacial and hydrostatic forces. To understand the phenomenon, we study the bending of a sheet touching the liquid surface at an angle while clamped at…
Hornification is the term used to describe the irreversible changes that occur in cellulose fibers due to recycling. While the effects of hornification have been documented, there are several conflicting hypotheses that attempt to explain the causes. In this research, AFM surface adhesion measurements made on virgin a…
The well known ‘crystal seed’ theory is first applied in this work to prepare TiO 2 film: a high refractive index rutile TiO 2 film is grown by electron beam evaporation on the rutile seed formed by 1100°C annealing. The average n is larger than 2·4, by far the highest in all the authors’ TiO 2 films. The films are ch…
Simultaneous deposition of two distinct materials A and B from opposite sides onto nanospheres leads to the formation of nanorod arrays with vertically separated components. This is demonstrated for the case of 220-nm-wide Si–Ta two-component rods (see image), which exhibit a measured and simulated vertical interface…
We extend the usual static view of short range order in metallic glasses to a dynamical model of local order. We use an atomistic simulation of a NiZr glass to investigate time-dependent fluctuations of the atomic environment. We show that, even in the "frozen" glass, the solute-centered clusters change their identiti…
Alkylsilane self-assembled monolayers (SAMs) on oxide substrates are commonly used as liquid crystal (LC) alignment layers. We have studied the effects of alkyl chain length, photolytic degradation, and mechanical rubbing on polar and azimuthal LC anchoring. Both gradient surfaces (fabricated using photolytic degradat…
Charge dynamics of (Ti1-xVx)2O3 with x=0-0.06 has been investigated by measurements of charge transport and optical conductivity spectra in a wide temperature range of 2-600 K with the focus on the thermally and doping induced insulator-metal transitions (IMTs). The optical conductivity peaks for the interband transit…
This paper aims at giving an idea of the contributions to the study of corrosion phenomena ensured by the practice of localized electrochemical techniques. For many corrosion phenomena high resolution is required. This is due to the fact that a huge amount of relevant information about electrochemical processes can be…
The solid state thermal, one pot, efficient chemical reaction between Zn and S or Se elements in a closed reactor at 650 degrees C/60 min under their autogenic pressure in an inert atmosphere yielded luminescent ZnS and ZnSe semiconducting nanopowders (NPs). Scanning and Transmission electron microscopy measurements c…
We present a first-principles study of ${\text{VO}}_{2}$ in the rutile and monoclinic $({M}_{1})$ phases by means of all-electron full-potential linear muffin-tin orbital GW calculation. Full frequency dependence and off-diagonal matrix elements of the self-energy are taken into account. As a result of dynamical corre…