Materials Literature
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High Resolution Image Download MS PowerPoint Slide We clarified the relationship between near-field optical properties and the local structure in monolayer assembly of gold nanoparticles by using scanning near-field optical microscopy (SNOM) and scanning electron microscopy (SEM). The success of superposition of the S…
Naive mode coupling theory (NMCT) and the nonlinear stochastic Langevin equation theory of activated dynamics have been generalized to mixtures of spherical particles. Two types of ideal nonergodicity transitions are predicted corresponding to localization of both, or only one, species. The NMCT transition signals a d…
The exciton dynamics of CdSe nanocrystals are intimately linked to the surface morphology. Photo-oxidation of the selenium surfaces of the nanocrystal leads to an increase in radiative decay efficiency from both the band edge and deep trap emission states. The addition of the primary amine hexadecylamine curtails nonr…
An octamolybdate-containing noncovalently assembled framework with the formula (Hcpy) 3 [Ag(β-Mo 8 O 26 )] ( 1 ) (cpy = 4-(5-chloropyridin-2-yl)pyridine) is synthesized and characterized. Compound 1 comprises a three-dimensional supramolecular network constructed from one-dimensional {[Ag(β-Mo 8 O 26 )] 3− } ∞ anionic…
Water soluble fluorescent nanocrystals were obtained by encapsulation of hydrophobic quantum dots (QDs) with amphiphilic phospholipids derived from the ring opening metathesis of norbornene-based monomers. The robustness of the newly coated quantum dots was assessed by comparative studies under various ionic condition…
The generalized Thomas-Kuhn sum rules are used to eliminate the explicit dependence on dipolar terms in the traditional sum-over-states (SOS) expression for the second hyperpolarizability to derive a new, yet equivalent, SOS expression. This new dipole-free expression may be better suited to study the second hyperpola…
The simultaneous measurement of wide-angle (WAXS) and small-angle X-ray scattering (SAXS) patterns has been made successfully for the first time for the uniaxially oriented δ (filled clathrate) and δ e (emptied clathrate) forms during the heating process. The basic idea behind these measurements is to clarify the corr…
An analytical model has been developed to describe the interaction between rigid ammonia molecules including the explicit description of induction. The parameters of the model potential were chosen by fitting high quality ab initio data obtained using second-order Møller-Plesset (MP2) perturbation theory and extended…
In the current research, we have successfully fabricated single-crystalline triclinic Mg 2 B 2 O 5 and orthorhombic Mg 3 B 2 O 6 nanorods by a solvothermal method under supercritical conditions. Detailed microstructures of as-synthesized products were characterized by X-ray diffraction, scanning electron microscopy (S…
Protein adsorption to surfaces prepared by chemisorption of thiol-terminated poly(ethylene glycol) (HS-PEG 650 -OH) to gold-coated silicon wafers followed by functionalization of the terminal PEG OH groups with aliphatic polyester dendrons was investigated. Chemisorption of HS-PEG 650 -OH to the gold surfaces was carr…
Hyperbranched polymers with a degree of branching of 100% have been prepared and converted into different types of unimolecular micelle-like structures. The polymers were obtained by acid catalyzed polycondensation of an isatin-based AB2 monomer, prepared without using toxic organometal reagents or extensive chromatog…
Ferromagnetic and ferroelectric characteristics of Gd substituted nickel ferrite (NiO⋅Fe1.925Gd0.075O3) were investigated. The material formed in the cubic inverse spinel phase and in addition, a small amount of GdFeO3 phase was identified. A small distortion of the cubic lattice was observed upon the substitution of…
Titanium-containing nanocomposites have been synthesized by calcination of a Ni−Ti layered double hydroxide as precursor. The nanocomposites were characterized by powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HRTEM), the Brunauer−Emmett−Teller (BET) method, and UV−vis diffuse refle…
In this work, we have identified key parameters for controlling the surface density of ferritin on metal oxides and observed a conformational change of the protein shell of ferritin occurring exclusively at pH 4. The quartz crystal microbalance with dissipation (QCM-D) monitoring technique was used to examine protein…
Novel photochromic 5-(3'-coumarinyl)-4-(3''-thienyl)thiazoles have been synthesized. These compounds display intensive fluorescence emission in the open form A, which is modulated by light. Fluorescence intensity decreases significantly upon irradiation of A with UV-light (lambda<400 nm) due to formation of the cyclic…
The structure evolution of poly(butylene adipate) (PBA) during isothermal melt crystallization and phase transition processes is investigated by Fourier transform infrared spectroscopy (FTIR). Detailed IR spectra analysis and band assignment are performed to disclose the bands sensitive to the alpha-form crystalline o…
High Resolution Image Download MS PowerPoint Slide Synthesis of thin (5−8 nm) CdS−Mn/ZnS core−shell nanowires (CSNWs) with high aspect ratio (up to ∼150) is reported for the first time. The modified solvothermal synthesis of CSNW involved two steps: the formation of Mn-doped CdS core followed by the ZnS shell. The CSN…
The pressure dependence of the prototypical glass-former propylene carbonate has been investigated over a broad range of temperature and pressure that were inaccessible in previous investigations using dielectric spectroscopy. We find that the viscosity measurements validate the scaling relation, eta(T,V)=J(TV gamma),…
We have used first-principles density functional theory to relax the experimentally reported crystal structures for the low- and high-temperature phases of Mg(BH 4 ) 2, which contain 330 and 704 atoms per unit cell, respectively. The relaxed low-temperature structure was found to belong to the P 6 1 22 space group, wh…
Photochromic fluorophore Sn(TTP)(DTE)2 , in which two phenolic derivatives of 1,2-dithienylethene are axially coordinated to (5,10,15,20-tetratolylporphyrinato)tin(IV) in trans position, has been synthesized and fully characterized by various spectroscopic methods. We have also investigated the photoregulated fluoresc…