Materials Literature
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A method is constructed that uses ultrasonic experiments to evaluate the parameters of the Jahn-Teller (JT) effect in impurity centers in crystals. The method is based on measurements of temperature dependent attenuation and phase velocity and does not require assumptions about mechanisms of relaxation. The results ar…
Abstract A series of bimodal high density polyethylene (PE) with different molecular weight distributions (MWDs) were prepared by melt blending, and the fitting multipeaks on Gaussian were used to analyze the MWD curves, and the ratio of the areas under unimodal curves was as a tool to characterize the MWD; the phase…
X-ray diffraction patterns and electron paramagnetic resonance (EPR) powder spectra (9 and 34 GHz) of BaTiO(3) + 0.04 BaO + xNiO (0.001 ≤ x ≤ 0.02) ceramics were studied to investigate the incorporation of Ni ions and their valence states as well as the development of the hexagonal phase (6H modification) of Ni-doped…
Self-assembly of colloidal nanocrystals and other nanosized building blocks has led to numerous large-scale and well-ordered superstructures. To quantify the superlattice quality we present a simple and efficient method, based on analysis of the autocorrelation function to determine characteristic order parameters for…
The LaXO(3):Tb(3+) (X = Al(3+), Ga(3+), In(3+)) perovskite nanoparticles were obtained using the nonhydrolytic treatment (Bradley reaction) of the molecular precursors of the La(O(i)Pr)(3), Al(O(i)Pr)(3), Ga(O(i)Pr)(3), In(5)O(O(i)Pr)(13), and Tb(acac)(3), respectively. It was shown that crystal structure and morpholo…
A thermodynamic model is presented that can accurately predict, typically within 5%, the average size and size distribution of size-selectively precipitated nanoparticles. A total interaction energy model was developed which accounts for: (1) the interaction of two differently sized ligand-stabilized nanoparticles in…
In-situ high-pressure X-ray diffraction and Raman spectroscopies have been performed on well-shaped CeO 2 nano-octahedrons enclosed by eight (111) planes. The CeO 2 nano-octahedrons are shown to be more stable than their bulk counterparts and some other reported CeO 2 nanocrystals of smaller size. The transition press…
We report on the adsorption and desorption behavior of chlorinated compounds on as-produced as well as heat-treated multiwalled carbon nanotubes (MWCNTs). Adsorption and desorption studies of trichloroethylene (TCE), 1,1,1-trichloroethane (1,1,1-TCA), and 1,3,5-trichlorobenzene (1,3,5-TCB), three chlorinated compounds…
Abstract This article deals with the study of polymer‐dispersed liquid crystal (PDLC) films that consisted of microdroplets of liquid crystals (LCs) dispersed in a polymer matrix. The PDLC films were fabricated by the photoinduced phase separation method under room‐temperature conditions. To determine the extent of th…
Abstract Water‐borne polyurethane with branched straight aliphatic chains (CWPU) was prepared and characterized by FTIR and TEM. The relationship between structure and water‐resistance of CWPU was studied. The results showed that the particle size of CWPU emulsion increases and the round particle turns into the spindl…
Cerium-doped lutetium orthoborate LuBO3 : Ce crystal is a promising scintillator with excellent properties, but the single crystal is difficult to grow because of the phase transition. In this article, the reported high-temperature (HT) vaterite phase was proved to exist at a low temperature (below 1200°C). Moreover,…
The large variety of hybrid carbon nanotube systems synthesized to date (e.g., by encapsulation, wrapping, or stacking) has provided a body of interactions with which to modify the host nanotubes to produce new functionalities and control their behavior. Each, however, has limitations: hybridization can strongly degra…
A recent interatomic potential for alpha-zirconium (Zr) is used to investigate the atomic configuration and motion of point defect clusters. The structure of the single self-interstitial atom (SIA) has a strong influence on the properties of small clusters containing up to six interstitials. For a given number of defe…
Abstract The use of foamed plastics gains more and more interest every day. Flexible poly(vinyl chloride) (PVC) foams have excellent mechanical properties and low price, thus their application is extensive. Foams are produced from plastisols, which are based on the suspension of the PVC resin in a plasticizer. Phthala…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHighly Ordered Poly(3-hexylthiophene) Rod Polymers via Block Copolymer Self-AssemblySu Yeon Choi†, Jea Uk Lee‡, Jin Wook Lee†, Sle Lee†, Yun Jeong Song‡, Won Ho Jo*‡, and Seung Hyun Kim*†View Author Information† Division of Nano-Sys…
This Letter reports on the fabrication of hybrid white-light-emitting diodes made of semiconductor nanocrystals (NCs) integrated on InGaN/GaN LEDs. Using core type and core/shell type CdSe NCs, the white light properties are systematically engineered for white light generation with high color rendering index (CRI). Un…
Anodic aluminum oxide (AAO) membranes with aligned, cylindrical, nonintersecting pores were selectively functionalized in order to create dual-functionality substrates with different pore-rim and pore-interior surface functionalities, using silane chemistry. We used a two-step process involving an evaporated thin gold…
New salicyl alcohol derived photolabile carbonyl protecting groups have been developed, and the effect of substituents on the photochemical properties of photolabile protecting groups (PPGs) has been studied. The 3-(dimethylamino)phenyl groups at the α position prove to be important to the efficiency of the deprotecti…
The intricate, hierarchical, highly reproducible, and exquisite biosilica structures formed by diatoms have generated great interest to understand biosilicification processes in nature. This curiosity is driven by the quest of researchers to understand nature's complexity, which might enable reproducing these elegant…
Ultrafast time-resolved mass spectrometry and structural dynamics experiments on trans-stilbene, cis-stilbene, and azobenzene, with excitation to high-lying electronic states, reveal a rich diversity of photochemical reaction dynamics. All processes are found to be quite unlike the well-known photochemistry on lower e…