Bibliografie tematiche / Cybotactic effects

Letteratura scientifica selezionata sul tema "Cybotactic effects"

Autore: Grafiati
Pubblicato: 25 maggio 2024

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  1. Articoli di riviste
  2. Tesi

Articoli di riviste sul tema "Cybotactic effects":

1

Janik-Kokoszka, Joanna. "On the smectic cybotactic groups and pretransition effects in the Miesowicz viscosity coefficient η2". Liquid Crystals 37, n. 1 (21 dicembre 2009): 77–84. http://dx.doi.org/10.1080/02678290903377467.

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2

Arakawa, Yuki, Yuko Ishida, Yukito Sasaki, Shunsuke Sasaki, Masatoshi Tokita e Hideto Tsuji. "Alkylthio-based asymmetric liquid crystals: unravelling the substituent effects and intercalated cybotactic nematic and smectic phases". Materials Advances 3, n. 7 (2022): 3218–28. http://dx.doi.org/10.1039/d2ma00050d.

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Abstract (sommario):
A homologous series of alkylthio- and alkoxy-based asymmetric calamitic liquid crystal (LC) molecules was developed. The effects of alkylthio groups on the phase transition properties and unexpected intercalated LC phase structures were studied.
3

Arakawa, Yuki, Kenta Komatsu, Yuko Ishida, Takuma Shiba e Hideto Tsuji. "Thioether-Linked Liquid Crystal Trimers: Odd–Even Effects of Spacers and the Influence of Thioether Bonds on Phase Behavior". Materials 15, n. 5 (24 febbraio 2022): 1709. http://dx.doi.org/10.3390/ma15051709.

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We report the synthesis, phase-transition behavior, and mesophase structures of the first homologous series of thioether-linked liquid crystal (LC) trimers, 4,4′-bis[ω-(4-cyanobiphenyl-4′-ylthio)alkoxy]biphenyls (CBSnOBOnSCB with a wide range of spacer carbon numbers, n = 3–11). All CBSnOBOnSCB homologs exhibited LC phases. Interestingly, even-n and odd-n homologs showed monotropic layered smectic A (SmA) and pseudo-layered twist-bend nematic (NTB) phases, respectively, below a nematic (N) phase. This alternate formation, which depends on spacer chain parity, is attributed to different average molecular shapes, which are associated with the relative orientations of the biphenyl moieties: linear and bent shapes for even-n and odd-n homologs, respectively. In addition, X-ray diffraction analysis indicated a strong cybotactic N phase tendency, with a triply intercalated structure. The phase-transition behavior and LC phase structures of thioether-linked CBSnOBOnSCB were compared with those of the all-ether-linked classic LC trimers CBOnOBOnOCB. Overall, thioether linkages endowed CBSnOBOnSCB with a monotropic LC tendency and lowered phase-transition temperatures, compared to those of CBOnOBOnOCB, for the same n. This is attributed to enhanced flexibility and bending (less molecular anisotropy) of the molecules, caused by the greater bond flexibility and smaller inner bond angles of the C–S–C bonds, compared to those of the C–O–C bonds.
4

Baker, Sheila N., Gary A. Baker, Maureen A. Kane e Frank V. Bright. "The Cybotactic Region Surrounding Fluorescent Probes Dissolved in 1-Butyl-3-methylimidazolium Hexafluorophosphate: Effects of Temperature and Added Carbon Dioxide". Journal of Physical Chemistry B 105, n. 39 (ottobre 2001): 9663–68. http://dx.doi.org/10.1021/jp0103528.

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5

Nguyen, Jason, William Wonderly, Tatum Tauscher, Robin Harkins, Francesco Vita, Giuseppe Portale, Oriano Francescangeli, Edward T. Samulski e Eric Scharrer. "The effects of lateral halogen substituents on the low-temperature cybotactic nematic phase in oxadiazole based bent-core liquid crystals". Liquid Crystals 42, n. 12 (6 ottobre 2015): 1754–64. http://dx.doi.org/10.1080/02678292.2015.1085599.

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6

Humeres, Eduardo, Luiz Fernando Sequinel, Mauricéa Nunes, Célia MS Oliveira e Patrick J. Barrie. "Kinetic effects induced by cellulose on water-catalyzed reactions. Hydrolysis of 2,4-dinitrophenyl cellulose xanthate and some sugar xanthate ester analogues". Canadian Journal of Chemistry 76, n. 6 (1 giugno 1998): 960–65. http://dx.doi.org/10.1139/v98-046.

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Abstract (sommario):
The hydrolysis of 2,4-dinitrophenyl cellulose xanthate (CelXDNP) was studied in 10% v/v aqueous ethanol at 25°C and μ = 0.1 (KCl). The water-catalyzed hydrolysis showed that, as for p-nitrobenzyl cellulose xanthate, it occurs through two parallel reactions with rate constants k'H2O = 4.40 x 10-3 s-1 for the fast hydrolysis, and k''H2O = 6.90 x 10-5 s-1 for the slow hydrolysis. The entropy of activation of the fast hydrolysis was 0.7 ± 1.8 cal K-1 mol-1. External nucleophiles such as hydroxide and simple amines show simple first-order kinetics. The spontaneous hydrolysis of CelXDNP in acetone-water mixtures indicates that the fast reaction does not occur through water polymers and that for water molarity higher than 30 M there are no acetone molecules (or very few) in the highly ordered cybotactic region of cellulose. The spontaneous hydrolysis of methyl 4,6-O-benzylidene- α -D-glucopyranoside 3-(S-p-nitrobenzyl-xanthate) although is faster than the 6-isomer, it is slower than the fast hydrolysis of p-nitrobenzyl cellulose xanthate (CelXNB). Also Δ Sdouble dagger is highly negative (-41.0 cal K-1 mol-1), as it is for alkyl and sugar analogues. Only for the fast hydrolyses of CelXDNP and CelXNB is the entropy of activation almost zero. It is concluded that there is no neighbouring OH effect on the fast hydrolysis of cellulose xanthate esters. Key words: hydrolysis, water catalysis, cellulose xanthate esters, methyl glucose, xanthate esters, neighbouring OH effect.
7

Baker, Gary A., Siddharth Pandey, Maureen A. Kane, Todd D. Maloney, Ann M. Hartnett e Frank V. Bright. "Effects of fluorescent probe structure on the dynamics at cysteine-34 within bovine serum albumin: Evidence for probe-dependent modulation of the cybotactic region". Biopolymers 59, n. 7 (2001): 502–11. http://dx.doi.org/10.1002/1097-0282(200112)59:7<502::aid-bip1055>3.0.co;2-i.

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8

Patranabish, Sourav, Yiwei Wang, Aloka Sinha e Apala Majumdar. "One-dimensional theoretical analysis of coupling and confinement effects on the cybotactic clusters of bent-core nematic liquid crystals". Physical Review E 99, n. 1 (28 gennaio 2019). http://dx.doi.org/10.1103/physreve.99.012703.

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9

R. A. Marque, Sylvain, Gerard Audran e Jean Patrick Joly. "Cybotactic Effect on Nitrogen and Phosphorus Hyperfine Coupling Constants in β-Phosphorylated Nitroxides." Journal of Chemical Engineering And Bioanalytical Chemistry 2, n. 1 (2018). http://dx.doi.org/10.25177/jcebc.2.1.3.

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Tesi sul tema "Cybotactic effects":

1

Vaiedelich, Enzo. "Les agents de contraste radicalaires pour l'IRM de demain". Electronic Thesis or Diss., Aix-Marseille, 2023. http://www.theses.fr/2023AIXM0049.

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Abstract (sommario):
Ce travail présente la synthèse de nouvelles sondes radicalaires sensibles à l'activité enzymatique. Ces nitroxydes à shift sont synthétisés dans le but de nouvelles méthodes de détection de l'activité enzymatique par RPE. De plus, ces sondes permettent une application en IRM-PDN en tant que nouveaux agents de contraste pour l'IRM et ainsi la mesure in-vivo de l'activité enzymatique. De ce fait, elles pourraient un jour remplacer les agents de contraste actuels, en grande majorité fait à partir de gadolinium. La première partie est consacrée à l'état de l'art dans le domaine des agents de contraste et de l'IRM-PDN. La deuxième partie est consacrée à l'établissement des voies de synthèse des cibles proposées en 17 et 18 étapes, et à l'amélioration des 6 premières étapes déjà réalisées au sein de l'équipe CRAB de l'ICR. La troisième et dernière partie est consacrée à l'étude cybotactique de certains intermédiaires de synthèse possédant des caractéristiques particulières. Ainsi, il y sera détaillé des interactions attendues ou non entre solvant et intermédiaires de synthèse
This work presents the synthesis of new radical probes sensitive to enzyme activity. These shift nitroxides are synthesized for new methods of detecting enzyme activity by RPE. In addition, these probes allow application in MRI-PDN as new contrast agents for MRI and thus in-vivo measurement of enzyme activity. As a result, they could one day replace the current contrast agents, mostly made from gadolinium. The first part is devoted to the state of the art in the field of contrast agents and MRI-PDN. The second part is devoted to the establishment of the synthesis paths of the proposed targets in 17 and 18 steps, and to the improvement of the first 6 steps already achieved within the CRAB team of the ICR. The third and final part is devoted to the cybotactic study of certain synthetic intermediates possessing characteristics. Thus, it will be detailed of the expected or not interactions between solvent and synthesis intermediates

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