Materials Literature
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The effects of surface modification of Na-montmorillonite (Na-MMT) on morphology and the rheological properties of polyethylene glycol/ organoclay nanocomposites are investigated. Dodecyltrimethylammonium bromide (DTABr) is used to modify the clay surface. Adsorption of DTABr on Na-MMT is monitored by zeta potential m…
Magnetic properties of thermally aged Fe-1wt.%Cu alloys were investigated. With increasing aging time, coercive force gradually increased and Barkhausen signal peak voltage decreased. Both behaviors suggested that Bloch wall movement was hindered by Cu precipitates and the pinning was strengthened with increasing prec…
Abstract Two new families of biodegradable poly[(ε‐caprolactam)‐ co ‐(ε‐caprolactone)] and poly[(ε‐caprolactam)‐ co ‐(δ‐valerolactone)] copolymers were synthesized via anionic polymerization. The polymerization was activated with macroactivators (MAs) based on telechelic poly(ε‐caprolactones) (PCLOs) and poly(δ‐valero…
Abstract On the basis of a single-layer hydrotalcite model, various computations with density functional theory (DFT) were carried out for the purpose of investigating the relationship between the Al/Mg molar ratio and the stability of single-layer hydrotalcite. With the increase in the Al/Mg molar ratio, both Al-O an…
The localized availability of bioactive biomolecules directly at the implant/tissue interface presents a promising strategy for improved wound healing and thus biointegration. Bioactive molecules that cannot be incorporated into the bulk material of a device may be delivered from a compatible surface coating, while th…
ASn-substituted BaM-hexaferrites with compositions BaFe12-2xAxSnxO19, where A = Co, Ni, Zn, and x=0.5--2, were synthesized using a solid-state reaction at 1100-1300 degC. Hexaferrites formation was controlled by X-ray powder diffraction. The static magnetic properties were determined and the ferromagnetic resonance fr…
Studies dating back to the late 1940s performed by a number of different organizations and laboratories have established the major advantages of Nuclear Thermal Propulsion (NTP) systems, particularly for manned missions. A number of NTP projects have been initiated since this time; none have had any sustained fuel dev…
The formation energies of vacancies and their complexes in copper and nickel at zero and finite temperatures are calculated by the embedded-atom method in the quasi-harmonic approximation. The role of temperature effects in the formation of various atomic configurations of intrinsic point defects is studied.
Abstract Three new oxo‐centered trinuclear mixed‐bridged carboxylate complexes with terminal unsaturated ligands ([M 2 M′(μ 3 ‐O)(μ‐O 2 C 3 H 3 ) 5 (μ‐O 4 C 6 H 7 )(O 2 C 3 H 3 ) (H 2 O) 2 ]·2H 2 O [M = Fe, M′ = Fe ( 1 ); M = Fe, M′ = Cr ( 2 ); M = Cr, M′ = Fe ( 3 )]) have been synthesized and characterized by means o…
The copolymerization of ε-caprolactone (CL) and 1,5-dioxepan-2-one (DXO) was performed by sequential addition of monomers in lipase CA catalyzed ring-opening polymerization (ROP) at 60 °C in bulk. CL was first polymerized up to a monomer conversion of 95%, and then DXO was added to the reaction mixture. The polymeriza…
Abstract The corrosion process during the drying out of zinc surfaces confined in crevices was studied using real time photograpy and in situ FTIR microspectroscopy. A pH‐indicator was used to visualise differences in the pH during the drying process. The distribution and the composition of the corrosion products afte…
We have developed a model of lattice thermal conductivity in a freestanding three-layered Si∕Ge∕Si heterostructure. This model takes into account the phonon confinement and interface scattering. Moreover, we derive an analytical expression of the interface scattering rate for phonon conduction in a semiconductor heter…
The real-time conduction mechanism during bias stress of three silica-based intermetal dielectrics in Cu damascene structures was investigated. High-frequency capacitance and$I$–$V$measurements were intermittently inserted into the process of bias stress to monitor the conduction mechanism change with time. All experi…
Abstract A possibility of using a thermoplastic silicone elastomer (TPSE) for reduction of surface defects in the extrusion of wood‐filled metallocene polypropylene (mPP) has been investigated in this work. A capillary rheometer and a single‐screw extruder have been utilized to study the effect of the additive on the…
Single‐walled carbon nanotubes (SWNTs) and gold nanoparticles (GNPs) were functionalized with triphenylene moiety. These triphenylene‐functionalized nanomaterials were dispersed into the supramolecular order of hexaalkoxytriphenylene derivatives. The functionalized‐nanomaterials‐discotic liquid crystal composites were…
Nanoparticles of spinel ferrites Mn x Zn 1- x Fe 2 O 4 with x = 0.0 to 1.0 were prepared by co-precipitation method. The ferrite samples were pre-sintered at 200°C at the rate of 200°C/h for 15h. Finally, one set of samples was sintered at 400°C and the other set at 500°C at the rate of 200°C/h for another 15h. The sp…
A large linearly graded structure on atomic scale up to 88 at. %/mm with oriented grown crystals was formed in selenium-tellurium (Se-Te) semiconductor using a strong gravitational field of one million G level at 260 °C. The lattice constants and the binding energies of Se and Te 3d electrons continuously changed alon…
Nonpolar crystal orientation showed a positive effect on the chemical bonding states of nitrogen-doped ZnO (ZnO:N) for attaining p-type conductivity. Remote-plasma-enhanced metalorganic chemical vapor deposition (RPE-MOCVD) was used to grow nonpolar- and polar-orientated films on R -plane and a -plane sapphires, respe…
Despite decades of research, progress in cancer chemotherapy is relatively slow, hampered, in part, by the lack of appropriate mechanisms to deliver anticancer drugs selectively to tumor tissues. This is a challenging task, as various cellular, anatomical and physiological barriers impede effective delivery of drugs t…
Photo‐oxidation studies on polypropylene (PP)/organoclay nanocomposites were performed. Nanocomposites of isotactic (iPP) and syndiotactic (sPP) polypropylene were prepared by melt compounding. The nanofiller was Boehmite Disperal OS2–alumina hydrates (Al(OH)O) modified by C10–C13 alkylbenzene sulfonic acid. The nanof…