Aligned Self-Organization Induced by Epitaxial Stress and Shear Deformation in Jahn–Teller Spinel ZnMnGaO4

Self-organization of charged particles on a two-dimensional lattice subject to anisotropic Jahn-Teller-type interaction and three-dimensional Coulomb repulsion

Physical Review B ◽

10.1103/physrevb.76.054523 ◽

2007 ◽

Vol 76 (5) ◽

Cited By ~ 17

Author(s):

T. Mertelj ◽

V. V. Kabanov ◽

J. Miranda Mena ◽

D. Mihailovic

Keyword(s):

Three Dimensional ◽

Charged Particles ◽

Coulomb Repulsion ◽

Self Organization ◽

Two Dimensional ◽

Dimensional Lattice ◽

Jahn Teller ◽

Type Interaction

Download Full-text

RHEOKINETIC AND MORPHOLOGICAL FEATURES OF THE REACTION FORMATION OF A POLYMER COMPOSITE MATERIAL BASED ON IMPACT-RESISTANT POLY(METHYL METHACRYLATE). MODEL AND APPLIED ASPECTS

Polymer journal ◽

10.15407/polymerj.43.04.251 ◽

2021 ◽

Vol 43 (4) ◽

pp. 251-267

Author(s):

V.F. SHUMSKY ◽

◽

I.P. GETMANCHUK ◽

L.F. KOSYANCHUK ◽

T.D. IGNATOVA ◽

...

Keyword(s):

Experimental Data ◽

Mechanical Properties ◽

Phase Separation ◽

Methyl Methacrylate ◽

Shear Deformation ◽

Polymer Composite ◽

Self Organization ◽

Poly Methyl Methacrylate ◽

Reaction Formation ◽

Azo Initiator

Based on the experimental data on the rheology of dispersions of hydrophobic aerosil (Am) in a low molecular weight hydrocarbon medium, the possibility of using a «micellar» mechanism for the formation of a bulk structure for such dispersions is considered. A model of such a structure before, during and after shear deformation is proposed, which makes it possible to interpret experimental data on the rheology of dispersed systems. The results of the study of rheokinetics are presented in a new visio – from the point of view of self-organization under the influence of the shear field. The PMMA–PU–Am system was considered as a polymer composite (PC), in which the matrix is the poly(methyl methacrylate) (PMMA) being modified, and the dispersed phase is a mixture of polyurethane (PU) with Am. It has been shown that during the reaction formation of this composition, the conditions of shear deformation of the system correspond to those at which self-organization and fixation of the coagulation rheopex structure of the nanofiller in PC is possible at the moment of reaching very high viscosity values (gel-point), when diffusion processes will be practically frozen. Two concentration regions of Am were predicted (before and after the percolation threshold), where an enhancement of the mechanical characteristics of PMMA can be expected. The relationship between the rheokinetics of the formation of a linear PMMA–crosslinked PU mixture in the presence of different amounts of oligomeric azo-initiator containing fragments of the polyurethane chain and groups capable of initiating radical polymerization of methyl methacrylate and the process of phase separation, morphology and mechanical properties of the final products has been established. It was shown that the time of phase separation and gelation are interrelated and there is in a simple dependence on the concentration of the azo-initiator. Such an initiator affects the structural-rheological transitions in the system and leads to the formation of morphology with smaller domains. The most stable system with the best dispersion of polyurethane in polymethyl methacrylate is a mixture containing 0.002 mol/L of azo-initiator, which has improved mechanical properties and increased impact viscosity.

Download Full-text

Application Of Electron Probe Analyses Of Minerals In Discussing The Relationship Between Ductile Deformation And Metamorphism

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100134855 ◽

1990 ◽

Vol 48 (2) ◽

pp. 250-251

Author(s):

Fan Guochuan ◽

Sun Zhongshi

Keyword(s):

Chemical Composition ◽

Shear Deformation ◽

Electron Probe ◽

General Rule ◽

Granulite Facies ◽

Ductile Deformation ◽

Higher Temperature ◽

Ductile Shear ◽

The Relationship ◽

Ductile Shear Deformation

Under influence of ductile shear deformation, granulite facies mineral paragenesis underwent metamorphism and changes in chemical composition. The present paper discusses some changes in chemical composition of garnet in hypers thene_absent felsic gnesiss and of hypersthene in rock in early and late granulite facies undergone increasing ductile shear deformation .In garnet fetsic geniss, band structures were formed because of partial melting and resulted in zoning from massive⟶transitional⟶melanocrate zones in increasing deformed sequence. The electron-probe analyses for garnet in these zones are listed in table 1 . The Table shows that Mno, Cao contents in garnet decrease swiftly from slightly to intensely deformed zones.In slightly and moderately deformed zones, Mgo contents keep unchanged and Feo is slightly lower. In intensely deformed zone, Mgo contents increase, indicating a higher temperature. This is in accord with the general rule that Mgo contents in garnet increase with rising temperature.

Download Full-text