Анализ систем оценки информационно коммуникационных компетенций

The article considers the methods of development of information-analytical system of formation of information-communicative competence of students through the portal of "Electronic University of information technology"

Large scale alignment of a lamellar block copolymer thin film via electric fields : a time-resolved sfm study

We have devised a novel route towards a nanoscopically striped surface pattern with long range order via the self-assembly of an ABC triblock terpolymer thin film exposed to an in-plane electric field. Via the interplay between surface interactions and the effect of the electric field the lamellae were oriented both perpendicular to the plane of the film and parallel to the electric field. Moreover, quasi in-situ scanning force microscopy measurements were used to follow the reorientation process as a function of time and to yield insight into the microscopic steps eventually leading to the ordered microdomain structure

Diblock copolymer sphere morphology in ultra thin films under shear

We demonstrate that the shear alignment and the shear-induced transitions in sphere-forming diblock copolymer single layer and bilayer films observed experimentally [Y.-R Hong, D. H. Adamson, P. M. Chaikin and R. A. Register, Soft Matter, 2009, 5, 1687] can be explained by cell dynamics simulation, a simple model with a Ginzburg-Landau Hamiltonian. In two layer films the spheres align in various arrangements, like (100) or (110) bcc planes, or transform to cylinders depending on the shear rate and the temperature. For the first time, we present a nontrivial alignment mechanism of a single layer of spherical domains in shear via slug-like movement of transient cylindrical micelles. In addition, we clarify the formation of the perpendicular cylinders, found in the recent particle based simulation [A. Chremos, K. Margaritis, A. Z. Panagiotopoulos, Soft Matter, 2010, 6, 3588]. © 2011 The Royal Society of Chemistr