Zobrazeno 1 - 10
of 76
pro vyhledávání: '"Maurice Kleman"'
It is usual to think of Focal Conic Domains (FCD) as perfect geometric constructions in which the layers are folded into Dupin cyclides, about an ellipse and a hyperbola that are conjugate. This ideal picture is often far from reality. We have invest
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604141
Autor:
D. S. Shankar Rao, K. S. Krishnamurthy, Channabasaveshwar V. Yelamaggad, Maurice Kleman, Madhu B. Kanakala
Publikováno v:
Soft Matter. 16:7479-7491
Colloids formed of solid/fluid particle dispersions in oriented nematic liquid crystals are known to be an ideal means of realizing fundamentally significant topological defect geometries. We find, experimentally, that twist-bend nematic (NTB) drople
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49dfc85e13b926a94117f0ebbd124d80
https://doi.org/10.1039/d0sm01085e
https://doi.org/10.1039/d0sm01085e
Autor:
K. S. Krishnamurthy, Maurice Kleman
Publikováno v:
Physical Review E. 98
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cd2c5f8fbe32ca1b5784df27815adf22
https://doi.org/10.1103/physreve.98.032705
https://doi.org/10.1103/physreve.98.032705
Publikováno v:
Soft matter. 14(26)
We report on the instabilities in the Freedericksz state of the twist-bend nematic (NTB) liquid crystal 1′′,7′′-bis(4-cyanobiphenyl-4′-yl)heptane (CB7CB). The quasi homeotropic NTB state, into which a planar (untwisted or 90°-twisted) nema
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3bad1954627c11996c7031849afb6d33
https://pubmed.ncbi.nlm.nih.gov/29930998
https://pubmed.ncbi.nlm.nih.gov/29930998
Publikováno v:
Liquid Crystals. 37:1047-1057
Double helical (DH and DH*) domains, defects of the smectic A (SmA) phase, have for the first time been studied in the smectic A* (SmA*) phase, composed of chiral molecules. Both left- and right-handed DH*s are found in SmA*s, but not in equal number
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::424969e2453165666fae30b3bcba320c
https://doi.org/10.1080/02678291003782846
https://doi.org/10.1080/02678291003782846
Autor:
Maurice Kleman
Publikováno v:
International Journal of Materials Research. 100:1449-1455
The concept of grain boundary, much studied for its relationship with dislocation motion in plastic deformation, is here developed and associated with that of disclination. After defining a disclination in terms of a Volterra process, we investigate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fa09221784d61f628a0882ffddad1d46
https://doi.org/10.3139/146.110196
https://doi.org/10.3139/146.110196
Publikováno v:
Mol. Cryst. Liq.
Mol. Cryst. Liq., 2007, 477, pp.537-547. ⟨10.1080/15421400701732449⟩
Mol. Cryst. Liq., 2007, 477, pp.537-547. ⟨10.1080/15421400701732449⟩
International audience; We have investigated Focal Conic Domains (FCD) in several materials that have a transition from a SmA to a nematic phase (N): the focal lines are seldom an ideal ellipse and an ideal hyperbola, and suffer large transformations
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c11e22d57e86924063e1241658d46e7c
https://doi.org/10.1080/15421400701732449
https://doi.org/10.1080/15421400701732449
Autor:
Maurice Kleman
Publikováno v:
Scripta Materialia. 49:5-9
The plastic deformation of quasicrystals (QC) is ruled by two types of singularities of the QC order: ‘ perfect ’ dislocations, which are singularities of the ‘phonon’ strain field, and stacking faults (here called matching faults ) which are
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6654c1a79fa7c1b48ddccdc0ac7a8e5b
https://doi.org/10.1016/s1359-6462(03)00166-0
https://doi.org/10.1016/s1359-6462(03)00166-0
Publikováno v:
The European Physical Journal E. 6:245-253
We have observed that different lamellar phases (thermotropic, lyotropic of surfactants or blockcopolymers) share the same rheological properties = A(T)σm, m = 1.67±0.1, independently of their chemical nature, in a range of shear rates , shear stre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c1ab640d285965c42205ef5fbabdaed0
https://doi.org/10.1007/s101890170007
https://doi.org/10.1007/s101890170007
Publikováno v:
The European Physical Journal E. 5:353-357
We have shown that cholesteryl nonanoate, a thermotropic compound which is well known to exhibit pretransitional effects at the smectic A (SmA) cholesteric (N*) transition (W.L. McMillan, Phys. Rev. A 4, 1238 (1971); 6, 936 (1972)), has in fact a TGB
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef3d19831d06445361fc7b14c9cc75be
https://doi.org/10.1007/s101890170066
https://doi.org/10.1007/s101890170066