Dilatometric Studies across Intra-Smectic Transitions in Some Homologues of N-(p-n-octyloxybenzylidene)p-n-alkylanilines

Prabhu, C. R.; Pisipati, V. G. K. M.

doi:10.1002/1521-4079(200202)37:2/3<269::aid-crat269>3.0.co;2-q

Cited by 12 publications

(6 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This striking result ␣ ʈ = 0 in the SmA phase is not some accidental value for 4O.8 but holds for many nO.m LC's such as 4O.7 [34], 5O.6 and 5O.7 [35], and 5O.8 and 5O.10 [36]. Note that the critical behavior of C p and ␣ V for 4O.8 [5,13,37] and other nO.m compounds [38,39] fits into the same pattern as the nS5 compounds; see Ref. [2].…”

Section: Methodsmentioning

confidence: 78%

“…In contrast, 4O.8 exhibits a plastic crystal CrB phase [48] when SmA m is cooled, and the "layer" spacing in CrB is only 1% greater than the SmA m d value. Most nO.m compounds show that same phase sequence [39,49]. Thus increasing p ʈ for 4O.8 has little or no effect: there is no dominant permeation mechanism, so p ʈ will not stabilize the SmA m phase; there is no bend or buckling tendency, so p ʈ will not destabilize SmA m .…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Critical linear thermal expansion in the smectic-Aphase near the nematic-smectic phase transition

2004

View full text Add to dashboard Cite

Recent high-resolution x-ray investigations of the smectic- A (SmA) phase near the nematic-to-SmA transition provide information about the critical behavior of the linear thermal expansion coefficient alpha// parallel to the director. Combining such data with available volume thermal expansion alpha(V) data yields the in-plane linear expansion coefficient alpha(perpendicular) . The critical behaviors of alpha// and alpha(perpendicular) are the same as those for alpha(V) and the heat capacity Cp. However, for any given liquid crystal, alpha//(crit) and alpha(perpendicular)(crit) differ in sign. Furthermore, the quantity alpha// (crit) is positive for SmAd partial bilayer smectics, while it is negative for nonpolar SmAm monomeric smectics. This feature is discussed in terms of the molecular structural aspects of these smectic phases.

show abstract

Section: Methodsmentioning

confidence: 78%

Section: Discussionmentioning

confidence: 99%

Critical linear thermal expansion in the smectic-Aphase near the nematic-smectic phase transition

2004

View full text Add to dashboard Cite

show abstract

“…1 In contrast to the sensible heat storage materials, a phase change heat storage material stores a large quantity of energy during its phase change while maintaining the temperature constant. A sensible heat storage material, e.g., water heats up and cools down when the heat is stored or released respectively.…”

Section: Introductionmentioning

confidence: 99%

“…However, the drawback here is that the temperature increase causes an increase of thermal energy loss, as well. 1 In contrast to the sensible heat storage materials, a phase change heat storage material stores a large quantity of energy during its phase change while maintaining the temperature constant. Once the phase transition is completed the temperature starts to rise or fall.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and processing of polypropylene ‐ paraffin compounds with enhanced thermal and processing properties: Impact penetration and thermal characterization

Saleem

Frormann

Koltermann

et al. 2013

J of Applied Polymer Sci

View full text Add to dashboard Cite

The compounds of polypropylene (PP) with paraffin wax (PR) as phase change material were fabricated by extrusion melt compounding. The compounds of PR and PP were brittle and showed PR leakage within its melting point range. The maximum 60 weight percent content of the PR was compounded with the polymer. The high amount of paraffin in the polymer plasticized and significantly decreased the melting point of the polymer. The addition of a linear triblock copolymer based on styrene and ethylene/ butylene noticeably ameliorated the workability, impact penetration and paraffin retention properties of the compounds. The compounds were further reinforced by carbon fibers and carbon nanotubes that led to an enhancement of their thermal conductivity and heat transfer efficiency. The material structure and thermophysical properties were studied by microscopy and various characterization techniques. The compounds of polymer with PR show phase change effect due to the solid-liquid phase transition of PR within its melting point range. The experimental time vs. temperature curves of the compounds were recorded within the melting range of PR. The experimental curves were compared with the theoretical calculated results. The results were in agreement except small difference that can be attributed to the experimental errors and the assumptions made during theoretical calculations. The manuscript describes the fabrication of shape enduring compounds, with improved thermal, physical, and mechanical properties and their processing by standard techniques, such as extrusion and blow molding.

show abstract

“…In the recent years there has been increasing interest in stable phases mediating the transition between different liquid crystalline phases (RANANAVARE et al 1994;RAO et al 1996;POTUKUCHI et al 1998;PISIPATI et al 1991;KUMAR et al 2000;PRABHU et al 2002). Further, computer speed has led to the use of computer simulation as a tool for understanding liquid crystal phases (WILSON et al 1991;LUCKHRUST et al 1999;BLATCH et al 2000;BINGER et al 2001).…”

Section: Introductionmentioning

confidence: 99%

Nematic Behavior of 5OCB in a Dielectric Medium at Phase Transition Temperature -A Statistical Analysis

Ojha

Kumar

Pisipati

2002

Zeitschrift für experimentelle und technische Kristallographie

Self Cite

View full text Add to dashboard Cite

Dilatometric Studies across Intra-Smectic Transitions in Some Homologues of N-(p-n-octyloxybenzylidene)p-n-alkylanilines

Cited by 12 publications

References 27 publications

Critical linear thermal expansion in the smectic-Aphase near the nematic-smectic phase transition

Critical linear thermal expansion in the smectic-Aphase near the nematic-smectic phase transition

Fabrication and processing of polypropylene ‐ paraffin compounds with enhanced thermal and processing properties: Impact penetration and thermal characterization

Nematic Behavior of 5OCB in a Dielectric Medium at Phase Transition Temperature -A Statistical Analysis

Contact Info

Product

Resources

About