Materials Literature
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Due to the existence of a macroscopic helical structure, oriented cholesteric liquid crystals (CLCs) can selectively reflect light. The wavelength bandwidth for these Bragg reflections is limited: typically a few tens of nanometers due to limited birefringence values available in organic mesomorphic compounds. Here, w…
Although the incorporation of small-molecule azobenzene dyes in polymer thin films has been investigated in the past, the application of the layer-by-layer adsorption technique has enabled incorporation of molecularly ordered dye layers without applying the Langmuir−Blodgett methodology. A problem with small-molecule…
Abstract The vulcanization of asphalt/styrene–butadiene–styrene (SBS) triblock copolymer blends in the presence of elemental sulfur was followed with a strain‐controlled rheometer. The vulcanization of the blends took place at temperatures greater than 140°C. From 150 to 180°C, the curing rate of the blends increased…
Temperature-dependent electron transport was measured through three-dimensional close-packed alkanethiol-stabilized silver nanocrystal arrays using interdigitated array electrodes. Nanocrystals ranging from 35 to 77 Å in diameter with Coulomb blockade energies well above kT were studied. The nanocrystal superlattices…
Cyano-mediated interaction of the alternating high-spin Mn(II) centers and low-spin Ru(III) centers in {Mn[Ru(acac)2 (CN)2 ]2 }n (Hacac=acetylacetone) results in long-range ferromagnetic ordering below 3.6 K. This novel Mn(II) Ru(III) coordination polymer, which has a diamond-like structure, was constructed from [Ru(a…
Amorphous thin films of tungsten oxide were deposited by sputtering onto glass substrates covered by conductive indium–tin oxide. The density and stoichiometry were determined by Rutherford backscattering spectrometry. Lithium ions were intercalated electrochemically into the films. The optical reflectance and transmi…
It is shown that sp2 phase organization plays an important role in the field emission from nanostructured carbons. Emission is found to depend on the cluster size, anisotropy, and mesoscale bonding of the sp2 phase, and the electronic disorder. It is found by Raman spectroscopy that increasing the size of sp2 clusters…
We synthesized azobenzene-conjugated bis(terpyridine) Ru(II) and Rh(III) mononuclear and dinuclear complexes and investigated their photochemical properties on excitation of the azo pi-pi band upon 366 nm light irradiation. The Ru mononuclear complex underwent trans-to-cis photoisomerization to reach the photostationa…
The nanocrystallization process of reactively sputtered thin amorphous Ta–Si–N films is investigated by anomalous small angle x-ray scattering (ASAXS) and x-ray diffraction (XRD). Changes in the microstructure in Ta40Si14N46 films, density variations in the amorphous matrix, decomposition, formation, and growth of nan…
A clear physics picture of ${\mathrm{TbBaCo}}_{2}{\mathrm{O}}_{5.5}$ is revealed on the basis of density-functional theory calculations. An antiferromagnetic (AFM) superexchange coupling between the almost high-spin ${\mathrm{Co}}^{3+}$ ions competes with a ferromagnetic (FM) interaction mediated by both $p\ensuremath…
Largely due to its role in nucleation and crystal-growth, the free energy of the crystal-melt interfacial free energy is an object of considerable interest across a number of scientific disciplines, especially in the materials-, colloid-, and atmospheric sciences. Over 50 years ago, Turnbull observed that the interfac…
Electron doping in the ferromagnetic and metallic double perovskites ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ is achieved via the partial substitution of ${\mathrm{Sr}}^{2+}$ by ${\mathrm{La}}^{3+}.$ We show that this doping promotes an extraordinary rising of the Curie temperature of about 70 K above that of the prist…
Despite being inert and nontoxic, implanted biomaterials often trigger adverse foreign body reactions such as inflammation, fibrosis, infection, and thrombosis. With regard to the inflammatory responses to biomaterial implants, it was previously found that a crucial precedent event was the spontaneous adsorption and d…
Barium-filled skutterudites BayCo4Sb12 with an anomalously large filling fraction of up to y=0.44 have been synthesized. The lattice parameters increase linearly with Ba content. Magnetic susceptibility data show that Ba0.44Co4Sb12 is paramagnetic, which implies that some of the Co atoms in BayCo4Sb12 have acquired a…
This paper describes a strategy that combines physical templating and capillary forces to assemble monodispersed spherical colloids into uniform aggregates with well-controlled sizes, shapes, and structures. When an aqueous dispersion of colloidal particles was allowed to dewet from a solid surface that had been patte…
Abstract Fabrication of deodorizing fabric was tried by grafting metal phthalocyanine derivative, a catalytic deodorant, onto polypropylene (PP) nonwoven fabric. Fe(III)‐4,4′,4″,4‴‐tetra carboxamide phthalocyanine (Fe‐TCMP) was synthesized. The Fe‐TCMP showed high‐deodorizing performance when tested for the eliminatio…
Abstract In the previous article, a diol‐based RBD palm kernel polyol was prepared. It has been found that the polyurethane foam produced is only giving a good compressive strength property at 45 kg/m 3 molded density. The combination of sorbitol into the polyol system resulted in a better dimensional stability and im…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA New Structure for the Substrate-Binding Antibiotic RamoplaninMei-Chu Lo, Jeremiah S. Helm, Gopal Sarngadharan, István Pelczer, and Suzanne WalkerView Author Information Department of Chemistry, Princeton University Princeton, New Jersey 08544 Cite this: J. Am. Chem.…
The microstructure, electrical properties, aging, and electrolytic decomposition of sputtered CuBr films are described and discussed with respect to the defect chemistry of this mixed Cu + ion−electron hole conductor. Ammonia gas adsorption increases the electrical resistance of the films. This effect can be used to d…
A new concept in initiator design using orthogonal protecting groups provides a versatile synthetic route to novel dendritic−linear AB, A 2 B, AB 2, A 2 B 2, and A 3 B 3 amphiphilic block copolymers. The A blocks are composed of the first- through third-generation dendrons from 2,2-bis(hydroxymethyl)propionic acid (bi…