Materials Literature
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S-shaped tetrakisporphyrin 2 forms supramolecular polymeric assemblies via a complementary affinity of its bisporphyrin units in solution. The self-association constant determined by applying the isodesmic model is >10(6) L mol(-1), which suggests that a sizable polymer forms at millimolar concentrations at room tempe…
We study, on an atomic scale, the influence of a single dislocation in a ${\mathrm{SrTiO}}_{3}$ sublayer on the local ferroelectric polarization of the neighboring ferroelectric ${\mathrm{PbZr}}_{0.2}{\mathrm{Ti}}_{0.8}{\mathrm{O}}_{3}$ (PZT) sublayer in an epitaxial ${\mathrm{SrTiO}}_{3}/{\mathrm{PbZr}}_{0.2}{\mathrm…
Biological surfaces (plant leaves, lizard and insect attachment pads, fish scales, etc.) have remarkable properties due to their hierarchical structure. This structure is a consequence of the hierarchical organization of biological tissues. The hierarchical organization of the surfaces allows plants and creatures to a…
Abstract All light and no heat? Structure–property relationships for photochromic and thermochromic N ‐salicylideneanils have been revised (see picture). One derivative has a packed crystal structure, is photochromic and exhibits an infinitely slow thermal back relaxation of technological interest. Complexation of the…
Five isostructural dicyanometallate coordination polymers containing metallophilic interactions (In[M(CN)(2)](3) (M = Ag, Au), KCd[M(CN)(2)](3), and KNi[Au(CN)(2)](3)) were synthesized and investigated by variable-temperature powder X-ray diffraction to probe their thermal expansion properties. The compounds have a tr…
Abstract To acquire polymer composites with high thermal conductivity and mechanical properties, the aluminum nitride (AlN) microparticles modified with titanate coupling reagent of isopropyltrioleictitanate (NDZ‐105) were employed to blend linear low‐density polyethylene (LLDPE) via powder mixing method. Thermal cond…
Applications of near-infrared (NIR) emitting CdTe-based QDs have been hampered by their sensitivity to oxidation. Here, we describe a synthetic method for the growth of CdTeSe/CdZnS core/shell QDs emitting in the NIR range (700−800 nm). We first synthesize high-quantum-yield zinc-blende CdTeSe cores with gradient comp…
Perovskite alkaline niobates, especially of one-dimensional morphology, have many important industrial applications. Wirelike Nb 2 O 5 and ANbO 3 (A = K, Na, (Na,K)) were fabricated by a topochemical method based on the molten salt synthesis. First, the precursor KNb 3 O 8 with wire structure was prepared under the co…
Cu 2 O nanowires are synthesized by reduction of CuO nanowires with hydrogen gas. Strong green photoluminescence dominated by band-edge emission is observed. Field effect transistors fabricated from individual Cu2O nanowires present high on-off ratio (>106) and high mobility (>95 cm2/V s). Furthermore, t…
Exploiting a double heterojunction of n-ZnO/insulator-MgO∕p-Si grown by molecular beam epitaxy, a visible-blind ultraviolet (UV) photodetector has been fabricated. The photodetector shows a rectification ratio of ∼104 at ±2V and a dark current of 0.5nA at a reverse bias of −2V.The photoresponse spectrum indicates a vi…
This is the first book to address the hot topic of functional silica gels and their applications. Originally used mainly in chromatography, specialized silica gels have evolved into crucially important functional nanomaterials suitable for use in, amongst other things, chemical synthesis, analysis, purification, surfa…
How do you design a peptide building block to make 2-dimentional nanowebs and 3-dimensional fibrous mats? This question has not been addressed with peptide self-assembling nanomaterials. This article describes a designed 9-residue peptide, N-Pro-Ser-Phe-Cys-Phe-Lys-Phe-Glu-Pro-C, which creates a strong fishnet-like na…
Microspheres constructed from ZnSe nanoparticles with a cubic structure and spherical flowerlike nanoarchitectures assembled from ZnSe(en) 0.5 nanoflakes were synthesized via a solvothermal reaction of ZnCl 2 with Na 2 SeO 3 and ethylenediamine in ethylene glycol in the presence of poly(vinylpyrrolidone) at 180 °C for…
Actinomorphic tubular ZnO/CoFe(2)O(4) nanocomposites were fabricated in large scale via a simple solution method at low temperature. The phase structures, morphologies, particle size, shell thickness, chemical compositions of the composites have been characterized by X-ray diffraction (XRD), field emission scanning el…
The superconducting transport properties of the conducting LaAlO3/SrTiO3 interface have been investigated in perpendicular and parallel magnetic fields. A large anisotropy in the transport properties is measured and the two-dimensional nature of the superconducting gas is confirmed. Analyses of the resistance versus t…
The minimum conductivity value as well as the linear dependence of conductivity on the charge density near the Dirac point in single and doublelayer graphene is derived from the energy-time uncertainty principle applied to ballistic charge carriers.
The Anderson model for a single impurity coupled to two leads is studied using the $GW$ approximation in the strong electron-electron interaction regime as a function of the alignment of the impurity level relative to the chemical potentials in the leads. We employ a non-equilibrium Green's function technique to calcu…
The helium ion microscope is a unique imaging instrument. Based on an atomic level imaging system using the principle of field ion microscopy, the helium ion source has been shown to be incredibly stable and reliable, itself a remarkable engineering feat. Here we show that the image contrast is fundamentally different…
By using molecular dynamics simulations, we show that significant strain hardening and ultrahigh flow stresses are enabled in gold nanowires containing coherent (111) growth twins when balancing nanowire diameter and twin boundary spacing at the nanoscale. A fundamental transition in mechanical behavior occurs when th…
CoSe$_2$O$_5$ has a crystal structure consisting of zig-zag chains of edge shared CoO$_6$ octahedra running along the c axis, with the chains separated by Se$_2$O$_5^{2-}$ units. Magnetic susceptibility measurements indicate a transition at 8.5 K to an ordered state. We investigate here the nature of this magnetic ord…