Materials Literature
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We observe the intermittent motion of a single planar twin boundary under a constant shear stress in organic crystals (TMTSF) 2 PF 6 . The boundary is forced to shuttle repeatedly in a specific region of a single crystal. For each move we measure the residence time t res at a certain trap as well as the local velocity…
The structure of titanium-base alloys with d-metals of V-VIII groups of the Periodic Table, quenched from high temperature p-phase region, was studied. X-ray diffraction analysis, light microscopy, and transmission electron microscopy were used in this investigation. It was established that the β-stabilising action of…
Abstract Melting behavior of semicrystalline poly(vinylidene fluoride) (PVDF) and poly(vinylidene fluoride‐ co ‐hexafluoropropylene) is investigated as a function of supercritical CO 2 pressure using a Linear Variable Displacement Transformer (LVDT). The melting temperature ( T m ) of both polymers is lowered due to s…
The low-temperature martensitic transformation of pure lithium is characterized by a complex phase diagram exhibiting the coexistence of several close-packed phases with the bcc matrix. On cooling, below the martensitic start temperature a long-range ordered 9R structure and a one-dimensionally disordered polytype pha…
Mechanical attrition, mechanical alloying and other methods of extreme plastic deformation (high pressure torsion, equal channel angular pressing) have been developed as versatile alternatives to other physical and chemical processing routes in preparing nanophase materials. Here several examples are discussed includi…
NiTi is proposed to be a biomaterial suitable for bone replacements. Reactive synthesis, Self-Propagating High-Temperature Synthesis (SHS) of NiTi from Ni and Ti powder is a suitable method to prod ...
A new neodymium cryptate [NdL](NO)3·H2O (L = 1,4,12,15,18,26,31,39,42,43,44-undecaazapentacyclo-[13.13.13.16,10.120,24.133,37]-tetratetraconta-4,6,8,10(44)11,18,20,22,24(43),25,31,33,35,37(42),38-pentadecaene) was synthesized by the reaction of free ligand L with neodymium nitrate and characterized by physical methods…
Abstract Cross‐linked polymeric materials are used in a wide range of applications. Special compositions are used in micro‐system technologies and its utilization is extending to integrated optics. We have been working for several years in the field of polymers for optical applications. Highly fluorinated polycyanurat…
Raman scattering investigations are carried out on nanocrystalline thorium oxide powders. Shift and broadening of the Raman peak associated with F2g phonons are observed for the nanocrystalline samples as compared with those of the bulk. The peak shift and broadening are found to increase further as the particle size…
The deposition of ultrasonic energy in tissue can cause tissue damage due to local heating. For pressures above a critical threshold, cavitation will occur in tissue and bubbles will be created. These oscillating bubbles can induce a much larger thermal energy deposition in the local region. The present work is an att…
Abstract Linear and branched poly(ethylene terephthalate) (PET) copolymers with polyethylene glycol) (PEG) methyl ether (700 or 2000 g/mol) end groups were synthesized using conventional melt polymerization. DSC analysis demonstrated that low levels of PEG end groups accelerated PET crystallization. The incorporated P…
Polyamide fibers (nylon 6) are modified by UV-radiation using a pulsed excimer laser with different treatment parameters. The treated samples are characterized by using a scanning electron microscopy (SEM), tapping mode atomic force microscopy (TM-AFM), x-ray photoelectron spectroscopy (XPS), and chemical force micros…
X-ray diffractometric study of Ti-47.0 to 50.7 at. % Ni alloys has been performed. A concentration dependence of B19' Martensite Lattice Parameters (MLP) exists in the range from 50.0 to 50.7 % Ni. MLP in Ti-47.0 and 50.0 % Ni coincide. Temperature dependence of MLP exists; MLP change in Ti-50.0%Ni alloy is enhanced i…
Abstract The formation of an α‐Fe layer between cementite and graphite was observed and investigated during metal dusting of iron in CO‐H 2 ‐H 2 O gas mixtures at both 600°C and 700°C. The condition to form this phenomenon is determined by the gas composition which depends on temperature. The iron layer formation was…
Abstract. The Ni-Mn-Ga L2, ordered alloys undergo a martensitic transformation (MT) which characteristics have been extensively analysed in relation to the electron to atom ratio (e/a). In that sense, alloys with ela<7. 60 are known to exhibit soft mode condensation into a premartensitic phase prior to the MT i…
We report on a temperature-dependent Raman study of terephthalidine-bis-butylaniline (TBBA) and terephthalidine-bis-heptylaniline (TB7A) in the temperature range 10-406 K and in the wavenumber regions 1120-1240 cm-1 and 1500-1700 cm-1. The variations of peak positions and linewidths of several Raman marker bands with…
The main goals of the research were to develop the new types of inexpensive reinforced polyurethane (PUR) elastomers and to study the effect of different commercial fillers on the density and mechanical properties of the developed materials. Two types of inexpensive commercial fillers based on synthetic and natural po…
Iron, aluminium and mixed iron aluminium pillared clays have been prepared by partial hydrolysis method and doped with 10% Mo. V and Cr. The samples have been characterised by XRD, FTIR and surface area and pore volume measurements. The surface acid site distribution has been determined by temperature programmed desor…
Two chiral and isomerizable liquid crystalline diacrylates were synthesized. The purpose of these compounds was to tune the helical twisting power of cholesteric materials containing these compounds by means of an E–Z photoisomerization of the photoactive group derived from stilbene. The photochemical behaviour of the…
Abstract Two series of isomeric copolyamides were synthesised, viz. polyamides 12.6 for which the adipic acid residues were partially replaced by cis / trans ‐1,4‐cyclohexanedicarboxylic acid (1,4‐CHDA), and polyamides 4.14 for which the 1,4‐diaminobutane residues were partially replaced by cis / trans ‐1,4‐diaminocyc…