Materials Literature
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Photochromic terarylene having a methoxy group and hydrogen as the leaving units at the photochemical reaction center carbon atoms has been synthesized. This molecule shows irreversible photochemical reaction affording a highly fluorescent condensed aromatic molecule.
Polystyrene (PS) nanofibers containing the inclusion complex forming beta-cyclodextrin (beta-CD) were successfully produced by electrospinning aimed at developing functional fibrous nanowebs. By optimization of the electrospinning parameters, which included varying the relative concentration of PS and beta-CD in the s…
Shrinking feature size and increasing transistor density, combined with the high performance demanded from next-generation microprocessors, have led to on-chip high heat flux “hot spots,” which have emerged as the primary driver for thermal management of today's integrated circuit (IC) technology. This article describ…
The unique physicochemical properties of nanoparticles make them promising substrates for application in the medical area. As there are no safety regulations yet, concerns about future health problems are rising. This study was conducted to prepare approximately 20 nm gold nanoparticles (GNPs) by a chemical reduction…
Synchrotron-based high-pressure x-ray diffraction measurements indicate that compressibility, a fundamental materials property, can have a size-specific minimum value. The bulk modulus of nanocrystalline titania has a maximum at particle size of 15 nm. This can be explained by dislocation behavior because very high di…
We present a thermodynamic study of the phase diagram of single-crystal ${\text{Ba}}_{1\ensuremath{-}x}{\text{K}}_{x}{\text{Fe}}_{2}{\text{As}}_{2}$ using specific-heat measurements. In zero-magnetic field a clear step in the heat capacity of $\ensuremath{\Delta}C/{T}_{c}=0.1\text{ }\text{J}/\text{mol}\text{ }{\text{K…
The phase behavior of a system of hard-cut spheres has been studied using a high-order virial theory and by Monte Carlo simulation. The cut-sphere particles are disks of thickness L formed by symmetrically truncating the end caps of a sphere of diameter D . The virial theory predicts a stable nematic phase for aspect…
Large scale dendritic MgO/ZnO composite nanowire arrays have been successfully synthesized on Si substrates using a two-step sequential hydrothermal synthesis at low temperature for the first time. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmissio…
Carbon nanotubes typically require the use of a dispersing or stabilizing agent to prevent significant aggregation during incorporation into a polymer matrix. These additives must be strongly associated, either covalently or physically, to achieve their purpose. In this study, multi-walled carbon nanotubes (MWNTs) wer…
Abstract We introduce the concept of an XPS ‘Topofactor’, which can be used in conjunction with the XPS ‘Thickogram’, to provide overlayer thicknesses on topographic samples of known geometry. The concept is essentially simple; analysis is performed with the sample normal directed towards the XPS analyser, the equival…
This review paper describes novel biointerfaces for nanobiodevices. Biocompatible and non-biofouling surfaces are designed largely based on cell membrane structure, and the preparation and functioning of the bioinspired interface are evaluated and compared between living and artificial systems. A molecular assembly of…
This article deals with experimental investigation of composites based on recycled high-density polyethylene (RHDPE) and poplar fibers (Populus deltoids) formed by air-forming and hot-pressing. The effects of the fiber content (55, 70, and 85 wt%) and compatibilizing agent (0, 2, and 4 wt%) concentration on the mechan…
The tunability of an omega-type left handed metamaterial was demonstrated at microwave frequencies via the magnetic control of liquid crystal (LC) orientation. From the experimental and simulation results, it is shown that the left handed pass-band can be tuned by 220 MHz by changing the orientation of LC molecules by…
Electrospinning of nanofibers with cyclodextrin inclusion complexes (CD-ICs) is particularly attractive since distinct properties can be obtained by combining the nanofibers with specific functions of the CD-ICs. Here we report on the electrospinning of poly(methyl methacrylate) (PMMA) nanofibers containing cyclodextr…
The magnetic properties of $ϵ{\text{-Fe}}_{2}{\text{O}}_{3}$ nanoparticles are investigated by x-ray magnetic circular dichroism. Sum rules relating the orbital and spin moment in the $\text{Fe}\text{ }3d$ band to the $\text{Fe}\text{ }{L}_{2,3}$ absorption cross sections show that the Fe orbital moment $({m}_{\text{o…
Abstract Different composite materials made of mixed protonic/electronic conductors, SrCe 0.9 Yb 0.1 O 3–δ (10YbSC) or BaCe 0.9 Yb 0.1 O 3–δ (10YbBC), and a mixed oxygen‐ion/electronic conductor, La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 (LSCF), were investigated for cathode application in intermediate temperature solid oxide f…
One-dimensional (1D) CdS@ZnS core-shell nanocomposites were successfully synthesized via a two-step solvothermal method. Preformed CdS nanowires with a diameter of ca. 45 nm and a length up to several tens of micrometers were coated with a layer of ZnS shell by the reaction of zinc acetate and thiourea at 180 °C for 1…
Observations on colossal electroresistance (ER) and giant magnetoresistance in doped PbPdO2, one of the candidates of a new class of materials, spin gap-less semiconductors, are reported. The resistivity is strongly suppressed by electrical current below a metal-insulator transition with the ER values of up to 107, wh…
Graft work: The first surface-initiated and site-specific palladium-catalyzed Suzuki polycondensation that allows selective grafting and patterning of semiconducting and emissive poly[9,9-bis(2-ethylhexyl)fluorene] (1) at room temperature is developed (see scheme). The patterning is demonstrated by AFM (see image).
Nominally pure undoped parent manganite ${\text{LaMnO}}_{3}$ exhibits a puzzling behavior inconsistent with a simple picture of an $A$-type antiferromagnetic insulator (A-AFI) with a cooperative Jahn-Teller ordering. We do assign its anomalous properties to charge transfer (CT) instabilities and competition between in…