Materials Literature
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The electron spectroscopy for chemical analysis (ESCA) studies show the increased binding energy (BE) of C 1s and O 1s on mercerization. The oxygen to carbon ratio increases. The cellulose I lattice structure is preserved, which is reflected in the XRD and IR spectra. These assume significance because these changes re…
Passivation of (100) silicon surfaces using alkyl Grignard reagents is explored via electrochemical and thermal grafting methods. The electrochemical behavior of silicon in methyl or ethyl Grignard reagents in tetrahydrofuran is investigated using cyclic voltammetry. Surface morphology and chemistry are investigated u…
Two new cardenolides, toxicarioside F (1) and toxicarioside G (2), were isolated from the latex of Antiaris toxicaria (Pers.) Lesch (Moraceae). Their structures were elucidated on the basis of spectral data and chemical evidence. Compounds 1 and 2 showed significant cytotoxicity against K562, SGC-7901, SMMC-7721, and…
The work function of a surface is one of its most basic and influential features. It has long been recognized that work function controls thermionic and field emission. The work function of a solid surface affects charge transfer to or from an adsorbate. It influences the electron tunneling probability between surfaces.…
We present exact analytical calculations of scanning tunneling currents in locally disordered graphene using a multimode description of the microscope tip. Analytical expressions for the local density of states (LDOS) are given for energies beyond the Dirac cone approximation. We show that the LDOS at the A and B subl…
Sustainable energy production, compatible with environment preservation, is one of the major problems to be tackled in the near future. The search for new energy production technologies as alternatives to fossil fuel combustion need to consider renewable sources.
Abstract Direct laser interaction and laser‐driven thin foils were used for investigation spallation phenomena inpolymetyl metacrylate (PMMA) targets in case of high strain rate. The aluminium foils with thickness 8 and 15 mkm were used as impactors. Mass and velocity of the laser‐driven foils after laser ablation and…
CNTs are recently discovered materials made by rolled-up sheets of graphene. They may be made either by a single shell [single-walled CNT (SWCNT) with radius ranging from 0.7 to 3-4 nm] or several nested shells [multiwalled CNT (MWCNT) with outer radius typically of the order of some tens of nanometers]. The length of…
We investigated by diffuse reflectivity the effect of hydrostatic pressure (1–1800 bar) on the thermal spin transition of Fe(PM−BiA)2(NCS)2 polymorph I, where PM=N-2-pyridylmethylene and BiA=4-aminobiphenyl. We evidenced the onset of a progressive transformation into a phase of higher cooperativity which cannot be ass…
Abstract The immobilization of polyoxometalates (POMs) into thin organized films is of major importance for the development of functional devices like electrochromic films and catalysts. We investigate herein two methods to incorporate the wheel‐shaped tungstophosphate [H 7 P 8 W 48 O 184 ] 33– (P 8 W 48 ) polyoxometa…
We study the thermodynamics properties of a one-dimensional gas of hard elongated particles. The particle centers are restricted to a line, while they can rotate in a two-dimensional space. Correlations between orientations of the objects are studied (by the transfer matrix method) as a function of density and aspect…
The long-term durability and safety of implanted devices is of great importance in the field of motor neuroprosthetics, where systems may possibly be utilized in excess of 50 years by some individuals. Neuroprosthetic systems have now been implanted in the upper extremity of spinal cord injured individuals for more th…
The structure, chemical composition, and properties of palygorskites from several deposits in the Russian Federation, Ukraine, Uzbekistan, and Slovakia have been investigated by transmission electron microscopy, microanalysis, X-ray diffraction, IR spectroscopy, and thermal analysis. It is shown that the palygorskites…
The maximum actuation frequency of magnetic shape-memory alloys (MSMAs) significantly increases with decreasing size of the transducer making MSMAs interesting candidates for small scale actuator applications. To study the mechanical properties of Ni-Mn-Ga single crystals on small length scales, two single-domain micr…
A hierarchical carbon material containing nanopores (micropores and mesopores) and micrometric sized capillaries (macropores) is produced using a combination of hard and soft templates. The hard template is a polypropylene (PP) cloth which decomposes during pyrolysis leaving a macroporous structure. The soft template…
Nanocomposites of polyindole (PIn) and TiO 2 were prepared by chemical polymerization. The morphology of nanocomposite particles was studied by scanning electron microscopy and transmission electron microscopy. The chemical structure of conducting polymers in nanocomposites was characterized by FTIR and Raman spectra.…
The efficiency of Eu(3+) luminescence by energy transfer from an antenna ligand can be strongly dependent on the metal ion coordination geometry. The geometric component of the Eu(III) sensitization has been probed using series of tetradentate 1,2-HOPO derivatives that are connected by bridges of varying length and ge…
Abstract Polyethylene terephthalate (PET) and polyethylene 2, 6 naphthalene dicarboxylate (PEN) nanocomposites were prepared by an extrusion process with organic‐modified montmorillonite clay. The steady‐state viscosity of all blends diminished as compared to the system with no clay added. A rheological study was cond…
Quantitative and qualitative variation in valve morphology in strains of Navicula cryptocephala and N. trivialis were examined using conventional valve measurements (length, width, striae density) and landmark-based geometric morphometric method. The ability of morphometric techniques to distinguish individual strains…
Exponentially growing layer-by-layer (e-LBL) assembled films attracts a lot of attention mostly due to multiple practical applications in biology and medicine. However, e-LBL was observed only for a very limited number of polymers. This fact inevitably limits the area of research and functionalities that one can obtai…