Materials Literature
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Microwave plasma deposited (100) diamond films have been thermally oxidized in dry O2 between 500 and 723 degrees C. The roughness of a single crystalline grain following oxidation is consistent with a layer-by-layer mechanism for the removal of carbon monoxide. The resulting surface exhibits infrared absorption bands…
The formation, crystal structure and magnetic properties of Sm2Fe17−xCoxCy were studied. The substitution of Co for Fe helps to stabilize the rhombohedral Th2Zn17-type structure (2:17) and eliminate α-Fe formation for carbon concentrations y ≤ 1.5. From the mixing enthalpy calculations based on Miedema's semi-empirica…
Man’s environment is pervaded by ionizing radiation of predominantly natural origin but now with an important contribution from anthropogenic activities. Exposure to ionizing radiation can have serious health implications, which is why it is of concern to us. This book brings together under one cover, the fundamentals…
On the basis of the Mott criterion for metal–insulator transition (MIT), an expression for the correlation length, identical to that for the coherence length in the theory of superconductivity, is obtained. This correlation length characterizes the size of an electron–hole pair (in an excitonic insulator) or the effec…
Crystallization of the poly(ethylene oxide) (PEO) confined in narrowly distributed, stable nanodroplets with a size of about 100 nm as obtained by the miniemulsion process is analyzed using DSC measurements. It is shown that nucleation in these PEO droplets occurs only at large supercooling. It is found that the polym…
Raman scattering spectra of a set of lithium manganospinels Li 1− x + z Mn 2− z O 4 with 0 ≤ x ≤ 1 and 0 ≤ z ≤ 0.33 are reported and analysed. Structural changes have been investigated following the evolution of Raman spectra with the concentration of lithium cations. The local structure was characterized as a functio…
ATR−FTIR is used to investigate the hydrogen-bonding properties of urethane/urea polymers with two soft segments, poly(propylene oxide) and polybutadiene. The polymers are prepared by extending a poly(propylene oxide)-based triisocyanate-terminated prepolymer (PU) with poly(butadienediol) (PBDO). The C O and N−H stret…
Hydrogen-bonded multilayers comprised of polyacrylamide (PAAm) and a weak polyelectrolyte, such as poly(acrylic acid) (PAA) or poly(methacrylic acid) (PMA), were investigated for their surface-cell interactions. The assembled films were lightly cross-linked thermally or photochemically in order to render them stable i…
Polyaniline (PANI) latex particles have been synthesized using both inverse and direct miniemulsion polymerization techniques. It is shown that inverse miniemulsions of anilinium hydrochloride can be oxidized by simple H 2 O 2, thus resulting under optimized conditions in highly crystalline PANI particles dispersed in…
Multilayers of poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate) precoated onto melamine formaldehyde (MF) particles via the layer-by-layer (LbL) self-assembly procedure were used as templates for the subsequent deposition of polyaniline (PANI). Transmission electron microscopic (TEM) and scan…
Electron transport and magnetic properties of three series of manganates of the formula (La 1− x Ln x ) 0.7 Ca 0.3 MnO 3 with Ln = Nd, Gd and Y, wherein only the average A-site cation radius ⟨ r A ⟩ and associated disorder vary, without affecting the Mn 4+ /Mn 3+ ratio, have been investigated in an effort to understan…
We consider the properties of a periodic structure consisting of small alternating 0- and pi- Josephson junctions. We show that depending on the relation between the lengths of the individual junctions, this system can be either in the homogeneous or in the phase-modulated state. The modulated phase appears via a seco…
I demonstrate that $^4$He adsorbates in carbon nanotube materials can be treated as one-dimensional interacting gas of spinless bosons for temperatures below 8 K and for coverages such that all the adsorbates are in the groove positions of the carbon nanotube bundles. The effects of adsorbate-adsorbate interactions ar…
We construct an exact dynamical mean field theory for nonresonant inelastic light scattering in the infinite-dimensional Falicov-Kimball model, which can be tuned through a quantum critical metal-insulator transition. Due to the projection of the polarization orientations onto different regions of the Brillouin zone a…
We have fabricated all II-VI semiconductor resonant tunneling diodes based on the (Zn,Mn,Be)Se material system, containing dilute magnetic material in the quantum well, and studied their current-voltage characteristics. When subjected to an external magnetic field the resulting spin splitting of the levels in the quan…
The systematic design of materials that alter their macroscopic properties in response to environmental stimuli continues to provide a basis for stimuli-responsive applications in biomaterials and microelectronics. We report discrete volume phase transitions in ultrathin polyelectrolyte multilayers (PEMs) driven by ch…
Mechanical and shape memory properties of a polycrystalline Ni2.18Mn0.82Ga alloy prepared by a PDS (Pulse Discharge Sintering) method were investigated. It was found that the material demonstrates the two-way shape memory effect after a loading - unloading cycle performed in the martensitic state, i. e. essentially wi…
The kinetics of dislocations is studied with computer simulation at loadings of different intensity. It is established that the dislocations have a few different structural states. The dislocations "with the micropore" play important role in the formation of large curved boundaries, and, as a consequence, in the forma…
The relaxation behavior of organically modified layered silicate−epoxy nanocomposites was studied using a combination of standard and temperature-modulated differential scanning calorimetry. For such nanocomposites, the silicate layers were intercalated in the matrix resin and epoxy networks were grafted onto the sili…
The effectiveness of photomediated cross-linking of type I collagen gels in the presence of rat aortic smooth muscle cells (RASMC) as a method to enhance gel mechanical properties while retaining native collagen triple helical structure and maintaining high cell viability was investigated. Collagen was chemically modi…