Materials Literature
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This communication reports the -A isotherms and spectroscopic characterizations of mixed Langmuir and Langmuir-Blodgett (LB) films of nonamphiphilic 2, -biquinoline (BQ) molecules, mixed with polymethyl methacrylate (PMMA) and stearic acid (SA). The pi-A isotherms and molefraction versus area per molecule studies indi…
Molecular aggregation and monolayer characteristics of non-amphiphilic p-terphenyl (TP) mixed with either polymethyl methacrylate (PMMA) or stearic acid (SA) at the air-water interface were investigated. The miscibility of the two components was evaluated by measuring and analyzing surface pressure versus area per mol…
Intriguing ZnO dendritic nanostructures have been synthesized by a two-step chemical vapor deposition process. Regular nanorods grow uniformly to the presynthesized ZnO nanowires on silicon substrate, the secondary nanorods are single-crystal hexagonal ZnO, and each nanorod grows along the [0001] direction. The relati…
BACKGROUND: Quantum dots (QDs) have numerous possible applications for in vivo imaging. However, toxicity data are scarce. OBJECTIVES: To determine the acute in vivo toxicity of QDs with carboxyl surface coating (carboxyl-QDs) and QDs with amine surface coating (amine-QDs), we investigated the inflammatory properties,…
We demonstrate that tridoping with Li + ions enhances the visible green and red upconversion (UC) emissions in Er 3+ /Yb 3+ -codoped Y 2 O 3 nanocrystals by up to half of the bulk counterpart, i.e., about 2 orders of magnitude higher than previous results. X-ray diffraction and decay time investigations give evidence…
This work investigated the polyanion-initiated gelation process in fabricating chitosan-tripolyphosphate (CS-TPP) nanoparticles intended to be used as carriers for delivering tea catechins. The results demonstrated that the particle size and surface charge of CS-TPP nanoparticles could be controlled by fabrication con…
A good choice of model formulation and model parameters is one of the most important and difficult aspects in mesoscale modeling and requires a systematic and quantitative analysis. In this paper, it is studied how the model parameters of a generalized phase field model affect the landscape of the free-energy density…
Non-local continuum mechanics allows one to account for the small length scale effect that becomes significant when dealing with microstructures or nanostructures. This paper presents some simplified non-local elastic beam models, for the bending analyses of small scale rods. Integral-type or gradient non-local models…
UNLABELLED: The purpose of this study was to develop a bifunctional iron oxide (IO) nanoparticle probe for PET and MRI scans of tumor integrin alphavbeta3 expression. METHODS: Polyaspartic acid (PASP)-coated IO (PASP-IO) nanoparticles were synthesized using a coprecipitation method, and particle size and magnetic prop…
Hexagonal-phase NaYF(4):Yb, Er/Tm nanocrystals are the best IR-to-visible upconverting materials to date, but user-friendly methods for making pure hexagonal-phase NaYF(4):Yb, Er/Tm nanocrystals with upconversion fluorescence are still lacking. Most of the methods reported so far require excess fluoride reactants in a…
Based on density functional calculations, optimized structures of graphite oxide are found for various coverages by oxygen and hydroxyl groups, as well as their ratio corresponding to the minimum of total energy. The model proposed describes well-known experimental results. In particular, it explains why it is so diff…
In this paper, we propose a random walk model as the main generation. mechanism for low-frequency noise in ZnO nanorod structures where surface states are involved. In this model, electrons in the channel can be trapped at surface states and perform a random walk between different surface states before being detrapped…
A high resolution soft x-ray photoelectron spectroscopic study of Ga and As 3d core levels has been conducted for Fe∕GaAs (001) as a function of Fe thickness. This work has provided unambiguous evidence of substrate disrupting chemical reactions induced by the Fe overlayer—a quantitative analysis of the acquired spect…
When a metal nanoparticle exhibits its unique dipole plasmon resonance, optical properties can be treated by considering a point dipole. Here we established a strong correlation between the surface-plasmon-induced coupled electric field in nanoparticle arrays and the extinction peak shifts. The model provides an effec…
The driving force for formation of a surface relief grating on an azobenzene-containing polymer is theoretically analyzed and experimentally confirmed by polarization analyses. We formulate the driving force based on the Coulomb interaction between an optical electric field and its induced polarization charges. The fo…
The remanent polarization reduces monotonically with the rising temperature from 295to430K in Pt∕IrO2∕Pb(Zr0.4Ti0.6)O3∕IrO2∕Pt thin-film capacitors, although the saturation polarization of the films is nearly constant in the temperature range. Fast-pulse measurements of polarization retention shortened on the order of…
Abstract Two acrylate monomers – 4‐(2′‐methoxycinnamoyl)phenyl acrylate, and 4‐(2′,5′‐dimethoxycinnamoyl)phenyl acrylate – comprising photocrosslinkable pendant chalcone moiety and a free radical polymerizable group were synthesized. The monomers were polymerized in the presence of ethyl methyl ketone at 70°C using be…
Sol-gel derived PbZrO3 (PZ) thin films have been deposited on Pt(111)∕Ti∕SiO2∕Si substrate and according to the pseudotetragonal symmetry of PZ, the relatively preferred (110)t oriented phase formation has been noticed. The room temperature P-E hysteresis loops have been observed to be slim by nature. The slim hystere…
In a previous paper analytical equations were derived for the packing fraction of crystalline structures consisting of bimodal randomly placed hard spheres [H. J. H. Brouwers, Phys. Rev. E 76, 041304 (2007)]. The bimodal packing fraction was derived for the three crystalline cubic systems: viz., face-centered cubic, b…
The purpose of this study was to determ the degree, level and capacity indices of agricultural mechanization in Sarab Region (N: 37o45', E: 47o30') in Eastern Azarbayjan Province, comprising about 65,164 hectares of farming land. The number of tractors, types of machines, and degree, level, and capacity of mechanizati…