Materials Literature
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Abstract The early stages of formation of the crystalline elements in the continuously forming sea urchin teeth were studied using polarized light microscopy, SEM, TEM and calcite overgrowth. Transient amorphous calcium carbonate (ACC) is initially deposited in the needles and subsequently transforms into a single cry…
The dynamics of charge separation and transport in metal-oxide nanostructures used in nanocomposite solar cells is measured by time-resolved surface photovoltage (SPV) and described by random walk numerical simulations (RWNS). Characteristic features of anomalous diffusion and trap-limited electron transport are obser…
Abstract We examined the formation of microcellular foam in a thermoplastic polyurethane elastomer (TPU) with supercritical carbon dioxide. Measurements of the permeability and impregnation with carbon dioxide suggested that the impregnation of TPU with carbon dioxide was affected by the soft‐segment chain length and…
Polyhedral oligomeric silsesquioxane (POSS)-capped PCL was synthesized via ring-opening polymerization of ε-caprolactone with 3-hydroxypropylheptaphenyl POSS as the initiator. The novel organic−inorganic amphiphile was incorporated into epoxy resin to prepare the organic−inorganic hybrid thermosets. The morphology of…
The Meerwein-Ponndorf-Verley (MPV) reaction involves the catalysed transfer of hydrogen from an alcohol to a carbonyl compound and provides an effective method for synthesizing carbonyl compounds under very mild conditions. The method, which requires the use of a catalyst, is high selective as it leaves most reducible…
Abstract This critical review analyzes the behavior of natural and synthetic polyampholytes and current theoretical descriptions based on Coulomb interactions between complementary charges. Sequences of bonds and groups that occur between fixed charges display interactions with other groups along the chain, or with so…
The ionization potentials of size- and isomer-selected diamondoids (nanodiamond containing one to five crystal cages) have been measured by means of total-ion-yield spectroscopy. We find a monotonic decrease of the ionization potential with increasing diamondoid size. This experimental result is compared to recent the…
Electrospinning is a process that produces nanofiber through the action of an external electric field imposed on a polymer solution or melt. This paper introduces a new system capable of producing continuous uniaxially aligned PAN nanofiber yarn by manipulating the electric field. The manipulation was carried out by e…
The Ser/Thr/Tyr phosphoproteome of Bacillus subtilis was analyzed by a 2-D gel-based approach combining Pro-Q Diamond staining and [(33)P]-labeling. In exponentially growing B. subtilis cells 27 proteins could be identified after staining with Pro-Q Diamond and/or [(33)P]-labeling and one additional protein was labele…
Abstract Strict protection of organic light‐emitting diodes (OLEDs) and other optoelectronic materials from direct contact with ambient moisture and oxygen is one of the major challenges in the development of flexible OLED displays and other flexible electronic devices. This problem is typically addressed by the use o…
Magnetic switching of a single molecule magnet (SMM) due to spin polarized current is investigated theoretically. The charge transfer between the electrodes takes place via the lowest unoccupied molecular orbital (LUMO) of the SMM. Generally, the double occupancy of the LUMO level, and hence a finite on-site Coulomb r…
The ring-opening process in diarylethene molecular switches is suppressed with decreasing temperature, leading to the complete absence of the photoreaction below a cutoff temperature. By contrast, the reverse ring-closure process shows no significant temperature dependence above 115 K. Reversibility of the photoproces…
Pharmaceutical manufacturing handbook , Pharmaceutical manufacturing handbook , کتابخانه مرکزی دانشگاه علوم پزشکی تهران
Abstract Hybrid bio/‐synthetic sensory conjugated polyelectrolytes were developed to achieve selective label‐free detection of target oligonucleotides with amplified fluorescence signal in solution. A completely water soluble and highly fluorescent conjugated poly( p ‐phenyleneethynylene) (PPE) was rationally designed…
We report work progress on the growth of Si quantum dots in different matrices for future photovoltaic applications. The work reported here seeks to engineer a wide-bandgap silicon-based thin-film material by using quantum confinement in silicon quantum dots and to utilize this in complete thin-film silicon-based tand…
In this article the effects of the number of molecular branches (chain ends) and the stereochemistry of poly(lactide)s (PLAs) on the enzymatic degradation and alkaline hydrolysis are studied. Various linear and branched PLAs were synthesized using lipase PS (Pseudomonas fluorescens)-catalyzed ring-opening polymerizati…
We show for the Ising model that is possible construct a discrete time stochastic model analogous to the Langevin equation that incorporates an arbitrary amount of damping. It is shown to give the correct equilibrium statistics and is then used to investigate nonequilibrium phenomena, in particular, magnetic avalanche…
High Resolution Image Download MS PowerPoint Slide We report the generation of white light from a simple transition-metal-doped semiconducting nanocrystal, namely, Mn 2+ -doped CdS, for the first time by suitably tuning the relative surface-state emissions of the nanocrystal host and the dopant emission. White light e…
This paper presents a detailed instruction manual for constructing the Landau expansion for magnetoelectric coupling in incommensurate ferroelectric magnets, including ${\mathrm{Ni}}_{3}{\mathrm{V}}_{2}{\mathrm{O}}_{8}$, $\mathrm{Tb}\mathrm{Mn}{\mathrm{O}}_{3}$, $\mathrm{Mn}\mathrm{W}{\mathrm{O}}_{4}$, $\mathrm{Tb}{\m…
Ultraviolet and visible radiation is observed from the contacts of a scanning tunneling microscope with Si(100) and (111) wafers. This luminescence relies on the presence of hot electrons in silicon, which are supplied, at positive bias on n- and p-type samples, through the injection from the tip, or, at negative bias…