Materials Literature
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Deformational behavior in freely suspended polymer nanomembranes with embedded carbon nanotubes has been investigated by in-situ monitoring of resonance Raman scattering (see Figure). A two-stage deformational process, with bending and buckling of the nanotubes at low deflections followed by along-axis stretching at h…
We have performed the high-field magnetization measurements on the spin-crossover complex $[{\mathrm{Mn}}^{III}(\mathrm{taa})]$ $({\mathrm{H}}_{3}\mathrm{taa}=\mathrm{tris}(1\text{\ensuremath{-}}(2\text{\ensuremath{-}}\mathrm{azolyl})\text{\ensuremath{-}}2\text{\ensuremath{-}}\mathrm{azabuten}\text{\ensuremath{-}}4\te…
Thin films of Zn1−xCoxO (x=1–15%) were grown on an Al2O3 (0001) substrate by pulsed laser deposition and characterized by investigating their photoluminescence (PL) and other optical properties. The films were highly (0001) oriented without any impurity phases as observed in x-ray diffraction. The optical transmittanc…
Although the mechanical behavior of carbon nanotubes has been studied extensively in recent years, very few experimental results exist on the shell buckling of nanotubes, despite its fundamental importance in nanotube mechanics and applications. Here we report an experimental technique in which individual multiwalled…
A theoretical model that predicts very strong magnetoelectric (ME) interactions at magnetoacoustic resonance (MAR) in single-crystal ferrite-piezoelectric bilayer is discussed. In such bilayers, the ME interactions are mediated by mechanical strain. We considered ME coupling at the coincidence of electromechanical res…
Abstract We report a novel hierarchically organized superstructure emerging from an exquisite association of inorganic crystals, organic polymers, and dyes. The resultant K 2 SO 4 /poly(acrylic acid) composite includes five different tiers from the nanoscopic to the macroscopic. An additional new tier leading to funct…
Protein design studies using coiled coils have illustrated the potential of engineering simple peptides to self-associate into polymers and networks. Although basic aspects of self-assembly in protein systems have been demonstrated, it remains a major challenge to create materials whose large-scale structures are well…
Ni-doped In2O3 thin films were fabricated by laser ablation on sapphire and MgO substrates under various conditions. All Ni:In2O3 films are well-crystallized, single phase, and show clear evidences of room temperature ferromagnetism (FM). Ni atoms were well substituted for In atoms, and distributed very uniformly over…
Robust crosslinked capsules are produced from water droplets stabilized by oil/water interfacial assembly of norbornene-functionalized CdSe/ZnS core–shell quantum dots that can be crosslinked by ring-opening metathesis polymerization (see Figure). The mechanical integrity of the capsules is maintained after removal of…
Abstract The 24 subunit heat‐shock protein from Methanococcus jannaschii has been genetically altered to display a dodecapeptide on the interior surface that has a strong binding affinity to the L1 0 phase of CoPt (CP_Hsp). Reaction of Co II and Pt II salts at 65 °C under reducing conditions results in the formation o…
Interaction between the superconductor and ferromagnet in MgB2∕Fe wires results in either a plateau or a peak effect in the field dependence of transport critical current, Ic(H). This is in addition to magnetic shielding of external field. Current theoretical models cannot account for the observed peak effect in Ic(H)…
Dendritic growth, and the formation of material microstructure in general, necessarily involves a wide range of length scales from the atomic up to sample dimensions. The phase field approach of Langer, enhanced by optimal asymptotic methods and adaptive mesh refinement, copes with this range of scales, and provides a…
The mechanisms for spin relaxation in semiconductors are reviewed, and the mechanism prevalent in p-doped semiconductors, namely spin relaxation due to the electron-hole exchange interaction, is presented in some depth. It is shown that the solution of Boltzmann-type kinetic equations allows one to obtain quantitative…
PbTe nanoboxes have been synthesized using a solvothermal route (see Figure). The experimental results show that both surfactant poly(ethylene glycol) and the volume ratio of ethanol to water play key roles in the formation of the nanoboxes. The contrast difference between the darker edges and lighter center indicate…
Using ab initio methods, we examine the electronic structure of substrate-supported metal films. We predict a coexistence between charge-transfer valence-bond states and bandlike metallic states. The role of the support composition in determining the balance of bond and band states is elucidated for Pt on Al- and O-te…
Abstract We report a new synthetic method for the preparation of high‐performance polyaniline, implementing a new concept of self‐stabilized dispersion polymerization. In contrast with conventional homogeneous or dispersion polymerization methods that use an aqueous medium containing aniline, acid, and oxidant, our ne…
We report muon spin rotation Knight shift and susceptibility studies for 1 T applied field along the crystalline c- and a-axes of the heavy fermion compound Ce2IrIn8. Below a characteristic temperature T* one observes a `Knight-shift anomaly' in which the Knight shift constant K no longer scales linearly with suscepti…
A microscopic model of the effect of unbinding in diffusion limited aggregation based on a cellular automata approach is presented. The geometry resembles electrochemical deposition - ``ions'' diffuse at random from the top of a container until encountering a cluster in contact with the bottom, to which they stick. Th…
We present the first muon spin relaxation measurements ever performed on elemental Pu, and set the most stringent upper limits to date on the magnitude of the ordered moment in alpha-Pu and delta-stabilized Pu (alloyed with 4.3 at. % Ga). Assuming a nominal hyperfine coupling field of 1 kOe per Bohr magneton we set an…
We present an ab-initio study of the phase transition cd->beta-tin in Si and Ge under hydrostatic and non-hydrostatic pressure. For this purpose we have developed a new method to calculate the influence of non-hydrostatic pressure components not only on the transition pressure but also on the enthalpy barriers between…