Materials Literature
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We use high content cell analysis, live cell fluorescent imaging, and transmission electron microscopy approaches combined with inhibitors of cellular transport and nuclear import to conduct a systematic study of the mechanism of interaction of nonfunctionalized quantum dots (QDs) with live human blood monocyte-derive…
We show an effective experimental method to prepare hierarchically porous zinc oxide (ZnO) spherical nanoparticles through a self-assembly pathway using surface-modified colloidal ZnO nanocrystallites as the building blocks and P-123 copolymers as the template in aqueous solution. Copolymers are thoroughly removed by…
Cellulose nanocrystals are promising candidates for applications in nanomedicine. To enable the use of fluorescence techniques in in vitro and in vivo studies, cellulose nanocrystals were labeled with fluorescein-5‘-isothiocyanate (FITC) via a three-step reaction, involving epoxy activation of the nanocrystal surface,…
BACKGROUND: The study aims at revealing the fate of nanoparticles administered intravenously and intraperitoneally to adult female mice, some of which were pregnant. Gold nanoparticles were chosen as a model because these particles have been found to be chemically inert and at the same time are easily traced by autome…
Piezoelectricity is inherent only in noncentrosymmetric materials, but a piezoelectric response can also be obtained in centrosymmetric crystals if subjected to inhomogeneous deformation. This phenomenon, known as flexoelectricity, can significantly affect the functional properties of insulators, particularly thin fil…
Growth kinetics and temporal size/shape evolution of gold nanocrystals by citrate reduction in boiling water were studied systematically and quantitatively. Results reveal that the size variation and overall reaction mechanism were mostly determined by the solution pH that was in turn controlled by the concentration o…
Gas desorption in vacuum from electron irradiated ultra high molecular weight polyethylene (PE) is measured with a high sensible mass quadrupole spectrometer. Measurements are performed in thick PE irradiated with 5 MeV electron beams at doses of the order of tens of kGy. The irradiation modifies the PE molecules prod…
The effect of impurities on the properties of single-wall carbon nanotubes (SWNTs) was investigated with multiple analytical techniques. Charge transfer is believed to occur between the impurities and the SWNTs as observed by combining the Raman scattering and x-ray photoelectron measurements. The impurity condition (…
The unique properties of compressed CO2, including its low cost, nontoxicity, easily tunable solvent strength, and favorable transport properties, make it an environmentally attractive alternative to volatile organic solvents. Suitable surface-active species can be utilized to realize the full potential of clean, CO2-…
A novel chromophore 2-carboxylic acid-4-nitropyridine-1-oxide (POA) has been synthesized, and the selective control of its crystal growth leads to two new second-order nonlinear optical (NLO) crystal materials named POA-I and POA-II accordingly. POA-I and POA-II are both orthorhombic, with space group P 2 1 2 1 2 1 .…
Lanthanide complexes with benzothiazole derivatives (Btz-R, R = OCH(3) and OH) and terpyridine (tpy) ligands were synthesized, and their photophysical properties were precisely investigated. The free Btz-OCH(3) ligand in toluene, excited with UV light, produced the normal emission bands around 410 nm, whereas Btz-OH p…
Searching for hydrogen storage materials suitable for applications has been the focus of extensive research in industry and academia. With the great success in obtaining stable hollow silicon-based nanostructures, one is naturally led to wonder whether silicon-based nanostructures are possible for chemical hydrogen st…
Electrodeposition has been used as a low temperature, soft method to prepare ZnO/polymer hybrid films. Polyvinyl alcohol (PVA) has been chosen as the water-soluble polymer additive. Films prepared at PVA concentrations ranging between 2 and 10 g L −1 are electrically conducting and contain well-crystallized ZnO. They…
The polyaniline–XC-72R carbon composites (PAn–C) are synthesized by in-situ chemical polymerization at low temperature. As a catalyst carrier we deposited platinum on the composite using chemical deposition. The conformation of carriers and catalysts is studied by SEM and FTIR. Methanol oxidation on the catalyst-modif…
A working subsolidus phase diagram for the system BaTiO 3 –Ba 5 Nb 4 O 15 has been determined by firing sol–gel‐synthesized samples over a range of temperatures. The main difference from previous diagrams is the greater extent of the Nb‐doped BaTiO 3 cubic solid solutions, BaTi 1−5 x Nb 4 x O 3 , at lower temperatures…
We used the surface force balance technique to investigate the influence of free polymer chains on the equilibrium and dynamic properties of dense polymer brushes, focusing on their extension and swelling under oscillatory shear flow. In particular, we extend earlier results on shear of brushes ( Nature 1991, 352, 413…
A new synthetic route to stable spin-delocalized radicals, annelated nitronyl nitroxides, has been developed on the basis of the condensation of benzofuroxan with aryl nitrones. The electronic structure of the resulting radicals was investigated through absorption spectroscopy, EPR, electrochemistry, and computation (…
We investigate the system-size dependence of the Helmholtz free energy of crystalline solids from computer simulation. We employ a standard thermodynamic integration technique along a reversible path that links the crystalline solid with a noninteracting Einstein crystal with the same structure. The key contribution t…
We study the effects of adding H 2 O 2 to acid-purified and unpurified single-walled carbon nanotubes (SWNTs) in aqueous suspensions using photoluminescence (PL) and optical absorption spectroscopies. The addition of H 2 O 2 to suspensions of unpurified SWNTs results in a rapid (1−2 h) quenching of the photoluminescen…
We use discontinuous molecular dynamics and grand-canonical transition-matrix Monte Carlo simulations to explore how confinement between parallel hard walls modifies the relationships between packing fraction, self-diffusivity, partial molar excess entropy, and total excess entropy for binary hard-sphere mixtures. To…