Materials Literature
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Conformational characteristics of polyzwitterionic molecules in aqueous solutions are investigated using the variational method. Analytical relations are derived for the radius of gyration of a single polyzwitterionic chain as a function of the chain length, electrostatic interaction strength, added salt concentration…
We investigate surface-curvature induced alteration in the Tomonaga-Luttinger liquid (TLL) states of a one-dimensional (1D) deformed hollow nanotube with a dumbbell-shape. Periodic variation of the surface curvature along the axial direction is found to enhance the TLL exponent significantly, which is attributed to an…
The path-dependent magnetizations (polarizations) and susceptibilities in dipole- and spin-glasses are described analytically for the standard protocols of temperature and field variations using the phenomenological Landau-type description of multiple metastable states in the nonergodic phases. The immediate manifesta…
First-principles elastic constants ${c}_{\text{ij}}$'s of ${\text{BiFeO}}_{3}$ with cubic nonmagnetic (NM)/ferromagnetic (FM) structures and rhombohedral antiferromagnetic (AFM) structure have been calculated within the generalized gradient approximation (GGA) and the $\text{GGA}+U$ approach. In addition, the elastic…
Well-defined and monodisperse wurtzite Cu−In−S nanocrystals were synthesized via a solution-based method using di- tert -butyl disulfide as the sulfur source. Reaction control (i.e., coordinating solvent, capping ligand, and sulfur source) proved critical for providing a kinetic pathway to the metastable wurtzite phas…
An on/off relationship: A supramolecular binary “OR” logic gate that generates highly enhanced fluorescence emission as the output signal is demonstrated (see picture). The system comprises a mixture of organogelator and photochromic compound and is able to process dual inputs of UV irradiation and thermal heating.
We present electronic structure calculations of few-layer epitaxial graphene nanoribbons on SiC(0001). Trough an atomistic description of the graphene layers and the substrate within the extended Hückel Theory and real/momentum space projections we argue that the role of the heterostructure's interface becomes crucial…
Synthetic routes to aluminium ethyl complexes supported by chiral tetradentate phenoxyamine (salan-type) ligands [Al(OC(6)H(2)(R-6-R-4)CH(2))(2){CH(3)N(C(6)H(10))NCH(3)}-C(2)H(5)] (4, 7: R=H; 5, 8: R=Cl; 6, 9: R=CH(3)) are reported. Enantiomerically pure salan ligands 1-3 with (R,R) configurations at their cyclohexane…
Semiconductor nanocrystals or quantum dots (QDs) are highly photoluminescent materials with unique optical attributes that are being exploited in an ever-increasing array of applications. However, the complex surface chemistry of these finite-sized fluorophores gives rise to a number of photophysical phenomena that ca…
Abstract Performance degradation data obtained from single solid oxide fuel cells, tested at 850 °C with air and humidified H 2 and using Ni‐YSZ anode supported cells, are presented here. Microscopic investigation is carried out on both anode and cathode to quantify variations in the morphology at different operation…
In this paper, a series of silver-deposited TiO 2 (Ag−TiO 2 ) nanoparticles (NPs) with a varying content of Ag were prepared by a photoreduction method and were attempted to serve as SERS-active substrates for the first time. SERS signals of 4-MBA molecules adsorbed on Ag−TiO 2 NPs were further enhanced considerably r…
Nanodiamonds (ND) exhibit unique properties due to their small size and high surface-to-volume ratio compared to bulk diamonds. A reduction in crystal size also affects ND Raman spectra. The confinement of optical phonons in nanocrystals $(<10\text{ }\text{nm})$ results in asymmetrically broadened Raman lines, whic…
Mechanical moduli of common organic electronic materials are measured by the buckling method. The organic layers were prepared on the elastomer polydimethylsiloxane (PDMS) substrate by transfer, direct spin-coating, or thermal evaporation. When a small (∼2%) compressive strain is applied to organic/PDMS film samples,…
Size-controlled and coated magnetite nanoparticles with glucose and gluconic acid have been successfully synthesized via a simple and facile hydrothermal reduction route using a single iron precursor, FeCl 3, and a combination of the inherent chemical reduction capability of sucrose decomposition products and their in…
Results of ac magnetic susceptibility measurements performed on the trigonal prismatic complex U(Ph(2)BPz(2))(3) demonstrate the presence of slow magnetic relaxation under zero applied dc field. Analysis of both the temperature and frequency dependence of the ac susceptibility indicate a temperature regime (T > approx…
We report that a homogeneous aqueous colloidal suspension of chemically cross-linked graphene oxide sheets was generated by addition of polyallylamine to an aqueous suspension of graphene oxide sheets followed by sonication of the mixture. This is the first example for producing a homogeneous colloidal suspension of c…
The split step method is applied to the iteration of the beam propagation method for analyzing the reflection of a laser beam by a volume Bragg grating. The application of the split step method is made possible by a way to properly treat the grating coupling terms in the paraxial wave equations. This method is demonst…
The NiTi alloy can be trained by repetitive loading or heating cycles. As a result of the training, a two-way shape memory effect (TWSME) can be induced. Considerable research has been reported regarding the TWSME trained by tensile loading. However, the TWSME trained by compressive loading has not been investigated n…
Abstract On the basis of the argument that a monochelated octahedral transition‐metal unit is topologically analogous to the Type II ( cis ‐dioxo) metal center frequently observed in the structures of many polyoxometalates, we report the synthesis and structural characterization of salts of two polyoxomolybdate anions…
Abstract The application of an externally applied pre‐stress on impact properties is studied on polymethyl methacrylate (PMMA) organic glass. Samples are tested under equi‐biaxial compression, simple shear and a combination of biaxial compression and shear. Equi‐biaxial compression is shown to increase the threshold s…