Materials Literature
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To investigate the relation between the Poisson's ratio of a re‐entrant honeycomb structure by varying the micropolar material constants such as micropolar Young's modulus E m , micropolar Poisson's ratio V m , characteristic length l, coupling factor N, and micropolar elastic constants in accordance with the micropol…
The ligand tripyridinedimethane (tpdm), consisting of three pyridine residues linked at their ortho carbons by two CH(2) groups, is shown to be a sterically flexible ligand capable of binding in a meridional arrangement in trigonal bipyramidal (tpdm) Cu(II)Cl(2) but binding in a facial arrangement in tetrahedral (tpdm…
A novel process for obtaining controlled morphologies in polymer blends is modeled numerically. Particles of one type of polymer are allowed to dissolve in a matrix of a dissimilar polymer. Prior to complete dissolution the blend is quenched into the two-phase region, such that phase separation takes place. The combin…
We conducted depth-of-penetration experiments with ogive-nose steel projectiles and limestone targets to determine the penetration limit velocity. The penetration limit velocity is defined as the minimum striking velocity required to embed the projectile in the target. For striking velocities smaller than the penetrat…
Heat treatment effects on the electrical and optical properties are investigated for In2O3–ZnO film with a Zn content [Zn/(In+Zn)] of 33 at. %. Thin films deposited in a mixed gas atmosphere (Ar+20% O2) by a magnetron sputtering method show high resistivity of about 1.7×10−1 Ω cm. A mixture of In2O3 (99.999%) and ZnO…
Premature senescence in cotton has been attributed to K deficiency in the cotton soils of Australia. The availability, release, and fixation of K+ in soils are mainly dependent on the clay mineralogy and layer charge characteristics of 2 : 1 clay minerals. There is a little information on the mineralogy and charge cha…
Liquid–liquid phase separation in polymethylbutylene/polyethylbutylene blends near the metastability limit was studied using small angle neutron scattering (SANS). Our objective was to study the relationship between quench depth and Rc, the lower limit for the length scale of the structures formed during the early sta…
The largest known silver(I) cluster with encapsulated acetylide ions, (Et4N)6[{(Ag2C2)2(AgCF3CO2)8(CF3CO2)3(H2O)2}2], and an infinite anionic silver(I) column with co-intercalation of cyanide and acetylide ions, (Et4N)3[(Ag2C2)2(AgCN)(AgCF3CO2)11(CF3CO2)3(H2O)6] (see picture; black dumbbells C22−, cross-hatched dumbbe…
As can be seen in the double helix of DNA, the single helix of proteins, etc., the three-dimensional (3D) helical/spiral structure is a fundamental structure of living things, and affords them critical functionalities. Helically coiled carbon fibers, which usually take the peculiar form of either a microcoil or a heli…
Observation of room-temperature single-electron tunneling (SET) in a conjugated polymer is reported. It is observed that conjugated polymers in the high doping level are composed of some ordered (metallic) and disordered (semiconducting) regions. This property has been exploited in conducting polypyrrole nanotubes to…
We have fabricated Cr-doped bulk Ge single crystal using the vertical gradient solidification method. The material shows ferromagnetic ordering at 126 K, as determined from temperature-dependent magnetization and resistance measurements. A sample with x=0.01 was p type with nh=3×1017 cm−3 at 350 K. The measured magnet…
Erosion of hydrocarbon films is investigated in a particle-beam experiment employing sources for argon ions and hydrogen atoms. Sputtering by argon ions sets in above a threshold of 58 eV and reaches a yield of 0.5 at an ion energy of 800 eV. Sputtering by argon ions with an additional flux of thermal hydrogen atoms t…
A curious effect is reported whereby an electric field apparently greatly affects the conductivity of an organic polymer, poly-3,4-ethylenedioxythiophene (PEDOT), doped to the “metallic” conducting regime when it is used in an all-organic polymer field effect transistor configuration. The response time for change in c…
We report on the fabrication and operation of integrated gated field emission devices using single vertically aligned carbon nanofiber (VACNF) cathodes where the gate aperture has been formed using a self-aligned technique based on chemical mechanical polishing. We find that this method for producing gated cathode dev…
We have coupled a high efficiency polarimeter based on exchange scattering from a magnetized target to a hemispherical analyzer. The target is a Fe(001)-p(1×1)O surface which gives rise to highly spin-dependent scattering in the 4–6 eV electron kinetic energy range. Due to the low scattering energy, the design of the…
We report on measurements of the thermal conductivity of a number of amorphous materials, including fluorinated silicate glass and carbon-doped oxides. These materials are of interest to the microelectronics industry for use as insulators in microprocessors. The samples measured were in the form of thin films deposite…
Abstract The efficiency of a macromolecular compatibilizer for reactive blending is strongly dependent on its potentiality of producing a grafted or block copolymer during processing. For the preparation of such a compatibilizer, the grafting of two different reactive groups onto the backbones of ethylene/propylene co…
The magnetization reversal processes of in situ ordered FePt thin films prepared by magnetron sputtering have been studied. A kind of nonmagnetic Ru pinning layer inserted in the FePt magnetic layer was described to introduce controllable pinning sites. The magnetization reversal mechanism of FePt thin films was obser…
Monomer styrene and initiator 2,2‘-azobis(isobutyronitrile) (AIBN) dissolved in supercritical (SC) CO 2 were impregnated into SC CO 2 −swollen polypropylene (PP) matrix at 35.0 °C, and the monomer were then polymerized within the PP substrates at 70 °C, resulting in polypropylene/polystyrene (PP/PS) composites. The Yo…
An explicit example of one-dimensional shearing is used to illustrate the necessity of extra boundary conditions for a class of incremental theories of plasticity regarded as otherwise conventional apart from a dependence of the tangential moduli on gradients of plastic strain.