Materials Literature
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Nanoextrusions on single crystalline Al and Al‐Mg plates under constrained cyclic tension evolve from random arrangements to regular 2D surface rectangular grid (“tweed” – A) and through gradual evolution (B) to 3D porous rhombic grid of voids (“pullover” – C). The “tweed” spacing can be decreased by loading frequency…
Abstract ABC triblock copolymers are known to exhibit a wide variety of unique types of morphologies compared to AB diblock copolymers. In the present study, poly(styrene‐block‐(ethylene‐alt‐propylene)‐block‐(methyl methacrylate)) (SEPM) triblock copolymers were synthesized and their morphologies were extensively stud…
Different carbon nanostructured materials, such as nanotubes, nanofibers, nanosprings and nanooctopus, were grown by changing the metal catalyst and experimental parameters of the thermal chemical vapor deposition process. These experiments were performed using a tubular furnace and methane or acetylene as carbon feed…
Angular-resolved X-ray absorption spectra were measured for pyrolytic graphite samples of various quality. A new approach to determining the misorientation of graphite grains in polycrystalline samples is proposed, which is based on calculations of the angular dependence of the relative intensity of a peak correspondi…
The interfacial properties of polyimide (PI)/M(100) (M = Cu and Ni) were investigated using density functional theory (DFT). A PMDA-ODA monomer unit was used to represent the full PI and the surface was represented by periodically repeated slabs. PI prefers the bridge and top sites on a Cu(100) surface but only forms…
Effect of lap hank and drafts, of various spinning sequence of machines, was studied on physical properties of different yarns using Taguchi method and analysis of variance. The ring yarn is highly even and has the least number of thin places and neps but thick places are the least in rotor yarn. The air-jet yarn is t…
In this work, the nanoscale electromechanical properties of Pb-based perovskites that are currently the main candidates for piezoelectric applications are investigated by Piezoresponse Force Microscopy (PFM). Local response is compared with that studied via conventional technique. The effect of local polarization swit…
Abstract Basic Al chloride, sulfate and nitrate were prepared by hydrolysis of Al chloride followed by precipitation with a Na sulfate solution, then re-dissolution in a Ba nitrate solution. The three laboratory-synthesized oligomers and solid, commercial chlorhydrol were characterized by X-ray diffraction, 27 Al nucl…
The behavior of the electrostatic adsorption of a single ferritin protein supramolecule, which formed a nanodot in its inner cavity, on a nanometric 3-aminopropyltriethoxysilane (APTES) pattern made on an oxidized Si substrate was studied using a numerical calculation. The total interaction free energy of the system,…
Chitosan/polyvinyl alcohol and chitosan/polyethylene oxide blend films were prepared by coagulation from solutions. The interaction energy density B and interaction parameter x 12 of the components were estimated from the change in the melting point of the synthetic component in the blends.
In the review the principles of technology of microcellular polymers preparations were presented. The process consists of three steps: the bubbles nucleation, growth and stabilization. The examples physical foaming agents most often used such as carbon dioxide or nitrogen were given. Attention is paid to the fact that…
Acoustic detection of partial discharges is based on the retrieval and analysis of mechanical signals produced by partial discharges. Acoustic method is widely used in locating partial discharge sources in transformers. For source location constant velocity of acoustic signals is used. Acoustic method also has potenti…
The syndiotactic polypropylene- block -atactic polystyrene (sPP- b -aPS), a novel crystalline−amorphous stereoregular diblock copolymer, is prepared in two steps. First, p -methylstyrene-capped syndiotactic polypropylene (pMS-capped sPP), which served as an end-functionalized prepolymer, can be successfully prepared b…
Abstract As the demand for downsizing in microelectronics is increasing, devices require material with lower dielectric constant accordingly. The dielectric constants for most polyimide (PI), including polyetherimide (PEI), films are ∼3.5. In this study, we modified the PEI by incorporating various monomers (fluorinat…
The chemical vapour infiltration (CVI) process is used to fabricate the interphases and matrices of CMCs. This process involves complex physico-chemical phenomena such as the transport of precursor, carrier, and by-product gases in the reactor and inside a fibrous preform, chemical reactions (pyrolysis and deposition)…
Main applications for preceramic polymers (precursors) are ceramic fibres, ceramic matrices and coatings. The requirements for the polymer are determined by the intended application and differ from a cross-linkable liquid to meltable and curable or unmeltable but soluble solid. For applying these precursors on a large…
The natural fibers (flaxen, hemp, wood ones), applied as the fillers of polymer composites were characterized on the basis of literature. The criteria of choice of thermoplastic polymeric matrices for such composites were discussed as well as the fibers' modification (making them hydrophobic) with the aim to improve t…
Efforts to develop a viable monolithic research reactor fuel plate have continued at Idaho National Laboratory. These efforts have concentrated on both fabrication process refinement and scale-up to produce full sized fuel plates. Progress at INL has led to fabrication of hot isostatic pressed uranium-molybdenum beari…
Ground rubber tire (GRT) is devulcanized using a coaxial ultrasonic devulcanization reactor at different ultrasonic amplitudes. The devulcanized samples are revulcanized isothermally using a sulfur-based recipe at various temperatures utilizing an advanced polymer analyzer (APA 2000). The curves obtained showed a reve…
In this paper, aging temperature and time dependence of ferroelectric, ferromagnetic, and magnetoelectric properties of lead zirconate titanate and nickel ferrite composite (1– x ) Pb(Zr 0.52 Ti 0.48 )O 3 – x NiFe 1.9 Mn 0.1 O 4 (PZT–NFM, x =0.03, 0.05, 0.1) are reported. The magnetoelectric composites of different co…