Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The quasi-equilibrium electrochemomechanical behavior of relatively thick polyaniline films in sulfuric acid is investigated through experimental measurements and theoretical modeling. The leucoemeraldine (LE)-emeraldine (EM) conversion, or redox switching, is studied. The dependence of film volume and electrochemical…
Density functional calculations have been carried out to investigate the nature of the inner phase of a (6,6) carbon nanotube, using the Cl(-) exchange S(N)2 reaction as an indicator. Inside the carbon nanotube the classical barrier height increases by 6.6 kcal/mol due to the nanotube polarizability. This suggests tha…
[structure: see text] Cyclic tetrapeptides in which alpha-amino acids alternate with cis-3-aminocycloalkanecarboxylic acids dimerize by forming hydrogen bonds between their alpha-faces but not between their gamma-faces, establishing the minimal structural requirements for the novel alpha,gamma-peptide hybrids SPN.
Abstract Aspartic acid‐based novel poly( N ‐propargylamides), i.e., poly[ N ‐(α‐ tert ‐butoxycarbonyl)‐ L ‐aspartic acid β‐benzyl ester N ′‐propargylamide] [poly( 1 )] and poly[ N ‐(α‐ tert ‐butoxycarbonyl)‐ L ‐aspartic acid α‐benzyl ester N ′‐propargylamide] [poly( 2 )] with moderate molecular weights were synthesize…
The paper provides new insights into the structure of Pt-containing diblock and triblock copolymers based on poly(ethylene oxide) (PEO) and poly(4-vinylpyridine) (P4VP), using a combination of atomic force microscopy (AFM), X-ray diffraction (XRD), transmission electron microscopy (TEM), and anomalous small-angle X-ra…
Abstract The melting behavior of poly(butylene succinate‐ co ‐adipate) (PBSA) isothermally crystallized from the melt was investigated by differential scanning calorimetry. Triple, double, or single melting endotherms were observed in subsequent heating scan for the samples isothermally crystallized at different tempe…
Many molecular magnetic clusters, such as single-molecule magnets, are characterized by spin ground states with defined total spin $S$ exhibiting zero-field splittings. In this work, the spectroscopic intensities of the transitions within the ground-state multiplet are analyzed. In particular, the effects of a mixing…
Conductive polymer-based nanocomposite has been utilized as a MEMS sensing material via a one-step, selective on-chip deposition process at room temperature. A doped polypyrrole (PPy) variant synthesized by incorporating multi-walled carbon nanotube (MWCNT) into electropolymerized PPy has been shown to improve the sen…
The understanding of the role of biological macromolecules in the nucleation of calcium carbonates and calcium phosphates is of primary importance for the development of biomimetic surfaces able to mimic the proteins used by living organisms to produce such composite materials. In this study we show how polyelectrolyt…
Functionalized carbon nanotubes, particularly those with asymmetric modification, would be of vital importance in a variety of applications in electronics, sensors, biological analysis, and beyond (see picture). A recent advance in the end-functionalization of single-walled carbon nanotubes offers great promise in rea…
The tuned vibration absorber (TVA) is a well established vibration control device. An adaptive TVA (ATVA) is one whose properties can be continuously adapted to maintain optimal tuning. This paper concerns an ATVA with shape memory alloy (SMA) elements: heating or cooling the SMA changes its elastic modulus and hence…
Nonaqueous solvothermal chemical reactions have found extensive utility in the growth of inorganic non-oxide materials. This report describes the successful use of organic solvothermal environments to synthesize energetically unstable copper azide precursors that are then decomposed in situ to crystalline metastable c…
The band structure of the diluted magnetic semiconductor (Ga,Mn)N, and the x-ray absorption near-edge structure (XANES) at the K edge of Mn, were calculated using the linearized augmented plane wave method. The calculated K-edge spectra fit well with experimental data obtained on samples of ${\mathrm{Ga}}_{1\ensuremat…
The ground-state electronic and magnetic properties of one of the possible structures of the trinuclear Cu(II) site in the native intermediate (NI) of the multicopper oxidases, the mu(3)-oxo-bridged structure, are evaluated using the C(3)-symmetric Cu(3)(II) complex, mu(3)O. mu(3)O is unique in that no ligand, other t…
Dynamic strain-induced nonlinearity in the modulus of filled rubbers shows a striking similarity to what is known about the glass transition of solid materials and the jamming transition of granular materials. This analogy stems from the reality that shear strain in dynamic mechanical measurements introduces fluctuati…
The perovskite Bi2Mn4/3Ni2/3O6 is polar and combines relative permittivity behavior consistent with ferroelectricity with the magnetic response of a concentrated spin-glass. Bi2Mn4/3Ni2/3O6 is accessible by ambient pressure synthesis despite the instability of the end-members BiMnO3 and BiNiO3 under these conditions.
The mechanism of energy transfer between quantum dots is investigated theoretically. In order to incorporate explicit account of the selection rules for absorption of circularly polarized light, a quantum electrodynamical treatment of the electronic coupling is derived. The electronic coupling is mediated by the excha…
Spinning around: The sensitivity of MRI contrast agents can be increased through multilocus binding. This restricts the internal motion and therefore increases the relaxivity of a bound protein multimer (see picture; A) relative to a single binding group (B), whose flexibility and internal motion limits the relaxivity…
Raman scattering measurements were conducted for 4-aminobenzenethiol (4-ABT) assembled on powdered copper substrates. Initially, very weak Raman peaks were detected, but upon attaching Ag nanoparticles probably via NH2 groups onto 4-ABT/Cu, distinct Raman spectra were observed. Considering the fact that no Raman peak…
Surface alloying is shown to produce electronic states with a very large spin-splitting. We discuss the long range ordered bismuth/silver(111) surface alloy where an energy bands separation of up to one eV is achieved. Such strong spin-splitting enables angular resolved photoemission spectroscopy to directly observe t…