Materials Literature
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Bismuth telluride thin films with layered nanostructure have been fabricated by radio frequency (RF) mag- netron sputtering. Thin films were deposited at various substrate temperatures and durations with a single Bi2Te3 target. The microstructures and chemical compositions of these films were characterized by X-ray di…
Amphiphilic block copolymers can self-assemble into micelles in water and can further form thermosensitive gels. Here, we explored Pluronic F127 ABA triblock copolymer of poly(ethylene glycol) (PEG; A) and poly(propylene glycol) (PPG; B), modified with telechelic ionic peptides, either anionic Gly-Phe-Gly-Asp (GFGD) o…
We synthesized three novel highly fluorescent compounds, 2-(2’-pyridyl)-3-(N-ethyl-(3’-carbazolyl))acrylonitrile, 2-(3”-pyridyl)-3-(N-ethyl-(3’-carbazolyl))acrylonitrile, and 2-(4-pyridyl)-3-(N-ethyl-(3’-carbazolyl))acrylonitrile by Knoevenagel condensation. The first two were synthesized without solvent in the presen…
A solid−solid crystalline transition from β to α forms in syndiotactic polystyrene (sPS) was found during the mechanical deformation in the temperature range of 130−218 °C, studied by X-ray and infrared spectroscopy. α and β forms, in contrast to the other two crystalline structures (γ and δ forms) in sPS, are two maj…
We report the novel assembly method of CdSe quantum dot (QD)/pyridine/multi-walled carbon nanotube (CdSe-py-MWNT) hybrid material between electrodes using two-step dielectrophoresis (DEP). At the first step, we assembled the individual MWNT between electrodes by the DEP method. At the second step, the CdSe-py material…
We report an unexpected dependence of DMDBS phase separation temperature on the molecular weight of the matrix isotactic polypropylene (iPP). DMDBS crystallizes out at lower temperatures for iPP with decreasing molecular weight (and correspondingly lower tacticity). All the iPPs in our study are reasonably high molecu…
New organic−inorganic hybrid fibers (polyvinyl alcohol (PVA)/HfO 2 ) were prepared by an electrospinning method using DI water as a solvent. The HfO 2 −acetate nanoparticles could be loaded up to 80% by weight in PVA polymer to fabricate uniform PVA/HfO 2 electrospun hybrid fibers. After annealing at 140 °C for 12 h,…
Biological applications of carbon nanotubes have been hampered by the inability to visualize them using conventional optical microscope, which is the most common tool for the observation and measurement of biological processes. Recently, a number of fluorescence labeling methods for biomolecules and various fluorescen…
Low density polyethylene (LDPE) coated lead monoxide (PbO) nanopowder was fabricated by using in situ high energy wet ball milling. Degrees of pulverization of wet milled PbO together with LDPE and cyclohexane were analyzed by means of PSA and SEM. PbO powder could be pulverized to ∼100 nm for 1 h milling while the su…
The polymerization using a high-yielding addition reaction between electron-rich alkynes and 7,7,8,8-tetracyanoquinodimethane (TCNQ) derivatives is described. The bifunctional monomer containing two TCNQ moieties and the counter comonomer bearing two dialkylaniline (DAA)-substituted alkynes are reacted in 1,2-dichloro…
We present a method for discovering dense packings of general convex hard particles and apply it to study the dense packing behavior of a one-parameter family of particles with tetrahedral symmetry representing a deformation of the ideal mathematical tetrahedron into a less ideal, physical, tetrahedron and all the way…
Abstract Trivalent cation conduction has been successfully demonstrated by two strategies. One is crystal structure selection, and the other is the selection of the constituent ions in solids. Since the trivalent cations possess certain ionic volume, a suitable mobile ion pathway should appear in the structure. One ca…
The (001)-oriented surface of epitaxial off-stoichiometric Ni–Mn–Ga ferromagnetic shape memory alloys was studied in both austenitic and martensitic phases. Scanning tunneling microscopy (STM) imaging of the austenitic surface reveals a well-ordered and reconstruction-free surface exhibiting predominantly Mn–Ga termin…
The lamellar morphology, cracks, and ring-banded spherulites were analyzed by allowing crystallization of poly(3-hydroxybutyrate) (PHB) on previously crystallized lamellar templates of poly( l -lactic acid) (PLLA) in mixtures of two semicrystalline polymers, PHB/PLLA (50/50) blend. PHB/PLLA blends were two-step crysta…
Next-generation applications of block copolymer thin films will require a better understanding of the driving forces unique to thin film coatings, specifically those arising from the polymer-air interface. Previous modeling studies of film morphology have treated rigidly confined films, neglecting free surface conside…
In this paper, we report the synthesis of iron-based superconductors CaFe 2− x Rh x As 2 using a one-step solid state reaction method that crystallizes in the ThCr 2 Si 2 -type structure with a space group I4/mmm. The systematic evolution of the lattice constants demonstrates that the Fe ions are successfully replaced…
The fabrication and characterization of single-walled carbon nanotube (SWCNT) composite thin film micropatterns and suspended beams prepared by lithography-compatible layer-by-layer (LbL) nano-self-assembly are demonstrated. Negatively charged SWCNTs are assembled with a positively charged polydiallyldimethylammonium…
Thermal transport measurements have been made on the Fe-based superconductor ${\mathrm{Lu}}_{2}{\mathrm{Fe}}_{3}{\mathrm{Si}}_{5}$ (${T}_{c}\ensuremath{\sim}6\text{ }\text{ }\mathrm{K}$) down to a very low temperature ${T}_{c}/120$. The field and temperature dependences of the thermal conductivity confirm the multigap…
Silicon carbide, due to its unique properties, has many promising applications in optics, electronics, and other areas. However, it is difficult to micromachine using mechanical approaches due to its brittleness and high hardness. Laser ablation can potentially provide a good solution for silicon carbide micromachinin…
The directed assembly of gold nanoparticles is essential for their use in many kinds of applications, such as electronic devices, biological labels, and sensors. Herein an atomic alteration in the molecular structure of ligand-stabilized gold nanoparticles that can shift the interparticle distance up to 1 nm upon cova…