Evidence of existence of an intermediate phase in isotropic liquids

Czaplicki, Jerzy; Piślewski, N.; Glinka, R.

doi:10.1016/0022-2364(90)90117-r

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“…The corresponding motional parameters are given in Table 2. In the crystalline phases (C5, C0, C4), the activation energies of the motion-generating T 1 minimum are found in the range 9-10 KJ=mol, as generally observed for methyl group reorientations in similar systems [25][26][27][28][30][31][32]. In C0, the distribution of environments results in a smaller activation energy (E ¼ 6 KJ=mol).…”

Section: A Bulk Analysismentioning

confidence: 91%

Dynamic ¹H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

Decressain

Mansare

Gors

et al. 2006

Molecular Crystals and Liquid Crystals

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The polymorphism and molecular dynamics of the liquid crystal MBBA [N-(pmethoxybenzylidene)-p-n-butylaniline], confined in controlled pores glasses (CPG) porous glasses of 82, 156, and 337 Å pore diameter, were investigated using 1 H nuclear magnetic resonance spectroscopy (NMR). The transition temperatures are determined from the analysis of NMR line-shapes and spin-lattice relaxation times (T 1 ). The results show that the depression of the phase-transition temperatures is linear versus inverse pore diameter. The motion parameters of the phases were derived from an isotropic rotational diffusion model (BPP). In the nematic and glassy nematic phases, the results show that the confinement weakly influences the dynamics. In the crystalline phases, the confinement results in a reduction of the motion activation energies and an important phase diagram modification. To interpret the experimental results with regard to the bulk characteristics properties, a Cole-Cole distribution model was introduced. The width distribution parameter was found to depend linearly on the inverse pore diameter in the crystalline phases.

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Section: A Bulk Analysismentioning

confidence: 91%

Dynamic ¹H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

Decressain

Mansare

Gors

et al. 2006

Molecular Crystals and Liquid Crystals

View full text Add to dashboard Cite

show abstract

Evidence of existence of an intermediate phase in isotropic liquids

Cited by 1 publication

References 4 publications

Dynamic ¹H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

Dynamic ¹H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

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Evidence of existence of an intermediate phase in isotropic liquids

Cited by 1 publication

References 4 publications

Dynamic 1H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

Dynamic 1H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

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Dynamic ¹H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica

Dynamic ¹H NMR Investigation of the Liquid Crystal MBBA Confined in Porous Silica