Multivariate processing of atomic-force microscopy images for detection of the response of plasticized polymeric membranes

The possibility of using the atomic-force microscopy as a method for detection of the analytical signal from plasticized polymeric sensor membranes was analyzed. The surfaces of cadmium-selective membranes based on two polymeric matrices were examined. The digital images were processed with multivariate image analysis techniques. A correlation was found between the surface profile of an ion-selective membrane and the concentration of the ion in solution.     

On a Correlation between the Microcrystallite Radius and the Plasticity Factor

The ratio of the dimensionless radius of the microcrystallites in liquid metals and other liquids at melting point to the stated earlier plasticity factor has been estimated. A frequency distribution of this ratio for 24 substances, including some metals, liquid noble gases, and other non-metals, seems to be normal and characterized by dispersion 16.6, mean value 54, and mean error 13.5. So it was supposed, this ratio is a constant which may be used for calculation of the microcrystallite radius. Some consequences of this statement are discussed.     

Orientational drawing of polymers and their blends

Pecularities of deformation of two-phase blends is considered depending on drawing conditions and mechanical properties of each phase. Significant anisotropy of mechanical properties of polymer blends film can take place because of particle orientation of dispersed polymer. This significant anisotropy exists also when there is no orientation of macromolecules in each phase. Possibility is demonstrated to regulate properties of each phase in polymer blends by addition of selective plasticizer which can act only on one polymer phase in two-phase polymer mixture.     

Small-Angle Neutron Scattering at the Pulsed Reactor IBR-2: Current Status and Prospects

Crystallography Reports - Neutron diffraction studies on the small-angle neutron spectrometer YuMO (Joint Institute for Nuclear Research, Dubna), based on the IBR-2 pulsed reactor, have been...     

The Influence of Inorganic and Organic Components of Biofilms with Microscopic Fungi on the Phase Composition and Morphology of Crystallizing Calcium Oxalates

Crystallography Reports - The influence of organic and inorganic components of biofilms with microscopic fungi on the phase composition and morphology of precipitating calcium oxalates has been...     

Diamond direct and inverse opal matrices produced by chemical vapor deposition

Diamond structures with inverse and direct three-dimensional opal lattices with period of 250–530 nm were grown by microwave plasma deposition in methane-hydrogen mixtures using porous SiO₂ opal matrix and its Si replica as templates, respectively. The Si templates can be filled with diamond to the depth as large as 80 layers of the spheres.     

Positioning of HPPE production on post-Soviet space by technology development and output

The comparative analysis of the molecular mass distribution, temperatures and heat effect of phase transitions, degree of crystallinity of defect materials and matrix polyethylene film were carried out. Possible reasons of deterioration of the quality of polyethylene on stages of its synthesis, transportation, storage, and processing were determined.     

Hysteresis phenomena in the light self-diffraction in a dense resonant medium

On the basis of the modified Bloch equations a theory is developed of the light self-diffraction in a thin film of a dense resonant medium with allowance for the dipole-dipole interactions of atoms. It is shown that for certain values of intensity of an external field, there occurs in the film the light-induced first-kind phase transition which causes the emergence of regions (domains) with the high excitation of atoms. The switching effects of the system dense resonant medium + periodically-modulated field under consideration result in a hysteresis behaviour in the dependence of the diffraction efficiency on the adiabatically changing intensity of the external field. The predicted hysteresis offers additional potentialities in the investigation of the dynamics of the first-kind phase transition in dense media and outlook for usage of the film as a switching logical element.