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。
A number of new porphyrins equipped with complementary triple hydrogen-bonding groups were synthesized in good yields. Self-assembly was investigated by NMR spectroscopy, dynamic light scattering (DLS), and atomic force microscopy (AFM). These artificial antenna systems were further characterized by stationary and tim…
Abstract— Progress in the use of liquid‐crystal polarization grating (LCPG) to modulate unpolarized (and polarized) light with a grating period as small as 6.3 μm is reported. Similar to LCPGs formed at larger periods (11 μm) reported previously, polarization‐independent switching, predominantly three diffraction orde…
Abstract Depending on the reaction conditions, the reaction of elemental palladium with H 2 SeO 4 in sealed glass tubes at 350 °C leads to red single crystals of Pd(SeO 3 ) [ C 2/ m , Z = 4, a = 6.788(2), b = 7.030(2), c = 7.008(2) Å, β = 118.09(3)°] or to yellow‐orange single crystals of Pd(SeO 4 ) [ C 2/ c , Z = 4,…
Directed assembly of fine-scale, very complex patterns with a variety of features, including terminations, jogs, disclinations, acute and obtuse bends, and sharp radii of curvature, was achieved with a symmetric poly(styrene-block-methylmethacrylate) (PS-b-PMMA) copolymer. The complex pattern was generated spontaneous…
We have investigated the evolution of the structural ordering and the crystal structure of polycrystalline ${\mathrm{Co}}_{2}\mathrm{Mn}\mathrm{Ga}$ Heusler alloy (HA) films and the structural effect on their magnetic properties. It is shown that the chemical and the structural ordering can be changed by the postannea…
This report presents a new route to enhance the wet properties of chitosan-acetic-acid-salt films using microfibrillated cellulose (MFC). The enhancement makes it easier to form chitosan-acetic-acid-salt films into various shapes at room temperature in the wet state. Chitosan with MFC was compared with the well-known…
Carbon nanofibers and carbon nanotubes continue to draw unwavering interest from industrial and academic communities because of their fascinating properties and their projected application values. This paper reports a one-step synthesis of high-purity carbon nanofibers with dome-shaped interiors by the noncatalytic th…
A diolate-bridged Fe 12 member of the “ferric wheel” class of molecular wheels has been obtained to complement the known MeO - -bridged members such as the prototypical Fe 10 wheel; reaction of these Fe 10 and Fe 12 ferric wheels with N-based chelates has given Fe 4 and Fe 12 molecular rectangles and squares, respecti…
Wholly aromatic poly(1,5-diaminoanthraquinone) (PDAA) particles were productively synthesized for the first time by chemically oxidative polymerization of 1,5-diaminoanthraquinone (DAA) by using CrO3, K2Cr2O7, K2CrO4, or KMnO4 as oxidants in acidic DMF. The effects of the oxidant species, oxidant/DAA ratio, polymeriza…
PolyHIPE are cross-linked, highly interconnected porous polymers with unique multiscale, open-pore structures that are based on high internal phase emulsions (HIPE). This work is the first to describe crystallinity in polyHIPE. This novel crystallinity was achieved by using monomers with n -alkyl side chains (acrylate…
A recently developed method (Hammond et al., 2006) for estimating solution binding at crystal habit surfaces and hence interfacial tension is extended to calculations of solution-effected attachment energies and hence to the prediction of solvent-mediated crystal morphology. The method is validated through examination…
Abstract There is a pressing need to improve the reproducibility of surface enhanced Raman spectroscopy (SERS) measurements, if the technique is to be used routinely for trace analysis. This is particularly true for colloidal SERS, in which data reproducibility is dominated by the final shape and size of metal cluster…
Abstract Microstructured optical fibers (MOFs) represent a promising platform technology for fully integrated next generation surface enhanced Raman scattering (SERS) sensors and plasmonic devices. In this paper we demonstrate silver nanoparticle substrates for SERS detection within MOF templates with exceptional temp…
Abstract Adsorption of low concentration formaldehyde on pitch‐based, rayon‐based, and PAN‐based activated carbon fibers (ACFs) and an unactivated PAN‐based carbon fiber (PAN‐CF) was investigated by a dynamic method. The pore structure and surface chemistry of these samples were characterized by liquid nitrogen adsorp…
Silver/polyaniline (Ag/PANI) nanowires are prepared by electropolymerization of aniline in porous anodic aluminum oxide (AAO) from an acidic electrolyte containing silver metal ions and aniline. Ag nanowires, PANI nanowires, and PANI thin films are made for comparative purposes. The nanowires are characterized by scan…
A novel heterostructured ZnO/ZnS ring structure has been synthesized. The formation process of the ring is attributed to the strain induced bending that arises mainly from the lattice mismatch between ZnO and ZnS. This growth model is in consistent to the electrostatic model proposed previously about the formation of…
Abstract Hybrid organic–inorganic polymer nanocomposites incorporating polyhedral oligomeric silsesquioxane (POSS) nanoparticles are of increasing interest for high performance materials applications. Octaisobutyl POSS/polypropylene nanocomposites were prepared at varying POSS concentrations via melt blending. The int…
A generic method for producing potentials to model organic−mineral systems is proposed. The method uses existing potentials for the components of the system and produces cross-term potentials between these components. The existing potentials are fitted to known mineral structures modeled with charges that mimic the Co…
Abstract A simple and generally applicable method of encapsulation in polyelectrolyte multilayer microcapsules based on temperature‐induced rearrangements within the shells is introduced. Using capsules consisting of eight layers of poly(diallyldimethylammonium chloride) (PDADMAC) and poly(styrene sulfonate) (PSS) as…
CdS semiconductor nanoparticles, with dimensions above and below the Bohr radius (∼2.5 nm) of bulk material, were prepared in a single-step benchtop procedure. The degree of quantum confinement in these nanoparticles was determined from their optical absorption and photoluminescence spectra. The size-dependent propert…