Relevant bibliographies by topics / Nematic-to-Isotropic Transition Temperature

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Nematic-to-Isotropic Transition Temperature'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Nematic-to-Isotropic Transition Temperature.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Nematic-to-Isotropic Transition Temperature"

1

Rao, N. V. S., and V. G. K. M. Pisipati. "Smectic C to Nematic Phase Transition Studies in NOBA." Zeitschrift für Naturforschung A 40, no. 5 (1985): 466–68. http://dx.doi.org/10.1515/zna-1985-0507.

Full text
Abstract:
The variation of density ϱ with temperature of p-n-nonyloxy benzoic acid in its isotropic, nematic and smectic-C phases is presented. The density jumps and the computed thermal expansion coefficient maxima suggest the order of the N - SC and N - I transitions to be first order. The pressure dependence of the transition temperatures as computed from the Clausius- Clapeyron equation and the presence of pretransitional effects at the N - SC and N - I transitions in the nematic phase are discussed.
APA, Harvard, Vancouver, ISO, and other styles
2

Skačej, Gregor, and Claudio Zannoni. "The nematic-isotropic transition of the Lebwohl–Lasher model revisited." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2201 (2021): 20200117. http://dx.doi.org/10.1098/rsta.2020.0117.

Full text
Abstract:
We revisited the nematic-isotropic (NI) transition of the Lebwohl–Lasher lattice model with a detailed investigation of samples containing 200 × 200 × 200 particles. The large-scale Monte Carlo (MC) simulations involved were carried out following the standard Metropolis, as well as the cluster MC Wolff algorithms. A notable free-energy barrier was observed between the isotropic and nematic phase, leading to long-lived metastable states and hysteresis. We provide an improved estimate of the nematic-isotropic transition temperature T NI , of the supercooling and superheating temperatures, of the temperature of divergence of pretransitional effects T C ∗ as well as an analysis of the size distribution of the ordered domains above T NI , contributing to a better understanding of this transition of key importance for liquid crystals. This article is part of the theme issue ‘Topics in mathematical design of complex materials’.
APA, Harvard, Vancouver, ISO, and other styles
3

Mukhopadhyay, K., and Prabir K. Mukherjee. "Density Effects in the Landau–De Gennes Theory Near the Nematic-Isotropic Phase Transition." International Journal of Modern Physics B 11, no. 29 (1997): 3479–89. http://dx.doi.org/10.1142/s0217979297001738.

Full text
Abstract:
Density effects at the nematic–isotropic phase transition is studied by means of Landau–de Gennes theory. The analysis shows that the density variation shifts the nematic–isotropic transition temperature T NI and changes the Landau–de gennes free energy expansion coefficients. The possibility of the tricritical behaviour of the nematic–isotropic phase transition is also discussed by the density variation. The low value of T NI -T* (T* is the absolute stability limit of the isotropic phase) and the various thermodynamic quantities are also calculated to compare with the experimental data.
APA, Harvard, Vancouver, ISO, and other styles
4

Nandi, B., M. Saha, and Prabir K. Mukherjee. "Landau Theory of the Direct Smectic-A to Isotropic Phase Transition." International Journal of Modern Physics B 11, no. 20 (1997): 2425–32. http://dx.doi.org/10.1142/s0217979297001234.

Full text
Abstract:
Direct smectic-A to isotropic phase transition is studied by means of Landau theory. The theory predicts the first order behaviour of the smectic-A to isotropic phase transition. The temperature difference T AI -T* is also calculated from the scaling equation of state and compared with the nematic to isotropic phase transition
APA, Harvard, Vancouver, ISO, and other styles
5

Weiss, Stephan, and Guenter Ahlers. "Nematic–isotropic phase transition in turbulent thermal convection." Journal of Fluid Mechanics 737 (November 25, 2013): 308–28. http://dx.doi.org/10.1017/jfm.2013.563.

Full text
Abstract:
AbstractWe report on turbulent Rayleigh–Bénard convection of a nematic liquid crystal while it undergoes a transition from the nematic to the isotropic phase in a cylindrical convection cell with a height equal to twice the diameter (aspect ratio $\Gamma = 0. 50$). The difference between the top and bottom plate temperature $ \mathrm{\Delta} T= {T}_{b} - {T}_{t} $ was held constant, while the average temperature ${T}_{m} = ({T}_{b} + {T}_{t} )/ 2$ was varied. There was a significant increase of the transported heat when the phase transition temperature ${T}_{NI} $ was between ${T}_{b} $ and ${T}_{t} $. Measurements of the temperatures along the sidewall of the sample as a function of ${T}_{m} $ showed several ranges with qualitatively different behaviour of quantities such as the time-averaged sidewall temperature, temperature gradient, or temperature fluctuations. We interpret these different ranges in terms of properties of the thermal boundary layers close to the top and bottom plates whose stability and nature depends on the location within the sample of ${T}_{NI} $.
APA, Harvard, Vancouver, ISO, and other styles
6

FINOTELLO, DANIELE, and GERMANO S. IANNACCHIONE. "HIGH RESOLUTION CALORIMETRIC STUDIES AT PHASE TRANSITIONS OF ALKYLCYANOBIPHENYL LIQUID CRYSTALS CONFINED TO SUBMICRON SIZE CYLINDRICAL CAVITIES." International Journal of Modern Physics B 09, no. 18n19 (1995): 2247–83. http://dx.doi.org/10.1142/s0217979295000884.

Full text
Abstract:
We review results of a high resolution systematic study of the specific heat for alkyl-cyanobiphenyl liquid crystals confined to the 0.2µm diameter cylindrical pores Anopore membranes. The nematic director alignment at the pore wall is varied from homeotropic to tangential by pore surface treatment. Several phenomena are uncovered by these studies which probed the weakly first order nematic to isotropic, the continuous smectic-A to nematic and the first order smectic-A to isotropic phase transitions. The specific heat is strongly dependent on the nematic director configuration, and confinement effects are remarkably distinct according to the order of the phase transition. The influence of elastic distortions and surface ordering and disordering effects are evident. Despite considerable departures from bulk behavior with regards to specific heat peaks size, rounding and width, and transition temperature shifts, a bulk-like critical behavior appears to be retained. The formation of smectic translational order within the pores is hindered for those liquid crystals that also possess a nematic phase. The average scalar order parameter temperature dependence is extracted from the specific heat results using a simplified Landau-de Gennes type of model, and is shown to be consistent with nuclear magnetic resonance results.
APA, Harvard, Vancouver, ISO, and other styles
7

Jiang, I. Min, Yu Jen Chen, Wen Chi Hung, et al. "Laser Beam Induces Reorientation in Nematic Liquid Crystals." Key Engineering Materials 428-429 (January 2010): 224–27. http://dx.doi.org/10.4028/www.scientific.net/kem.428-429.224.

Full text
Abstract:
Nematic liquid crystals (NLCs) can be easily reoriented by the laser beam at the temperature closed to the nematic–isotropic phase transition (TNI). At the temperature closed to TNI, the propagating mode of laser beam and the optically induced phase transition were explored by using a microscopic conoscope technique. This investigation demonstrates the formation of soliton at particular beam propagation modes. The interaction between nematic liquid crystals and the laser beam with different polarizations showed the nonlinearity in optical alignment.
APA, Harvard, Vancouver, ISO, and other styles
8

Sandmann, M., F. Hamann, and A. Würflinger. "PVT Measurements on 4-n-Pentyl-4´-Cyano-Biphenyl (5CB) and trans-4-(4´-Octyl-Cyclohexyl)-Benzonitrile (8PCH) up to 300 MPa." Zeitschrift für Naturforschung A 52, no. 10 (1997): 739–47. http://dx.doi.org/10.1515/zna-1997-1008.

Full text
Abstract:
Abstract Specific volumes are presented for 4-n-pentyl-4´-cyanobiphenyl (5CB) and trans-4-(4´-octyl-cyclo-hexyl)-benzonitrile (8PCH) for temperatures between 300 and 370 K up to 300 MPa. The p,Vm ,T data were determined for the liquid crystalline and isotropic phases, and partly also for the solid phase adjacent to the melting curve. Stable and metastable crystal phases can be distinguished. The density and melting temperature of the metastable form are lower than for the stable one. Volume and enthalpy changes accompanying the phase transitions are reported as well. The p,Vm ,T data allow to calculate the entropy change for a hypothetical transition at constant volume. The molar volumes along the nematic-isotropic phase transition TNI (p) allow to determine the molecular field parameter γ = ∂In TNI /∂ In VNI.
APA, Harvard, Vancouver, ISO, and other styles
9

Laux, Tim, and Yuning Liu. "Nematic–Isotropic Phase Transition in Liquid Crystals: A Variational Derivation of Effective Geometric Motions." Archive for Rational Mechanics and Analysis 241, no. 3 (2021): 1785–814. http://dx.doi.org/10.1007/s00205-021-01681-0.

Full text
Abstract:
AbstractIn this work, we study the nematic–isotropic phase transition based on the dynamics of the Landau–De Gennes theory of liquid crystals. At the critical temperature, the Landau–De Gennes bulk potential favors the isotropic phase and nematic phase equally. When the elastic coefficient is much smaller than that of the bulk potential, a scaling limit can be derived by formal asymptotic expansions: the solution gradient concentrates on a closed surface evolving by mean curvature flow. Moreover, on one side of the surface the solution tends to the nematic phase which is governed by the harmonic map heat flow into the sphere while on the other side, it tends to the isotropic phase. To rigorously justify such a scaling limit, we prove a convergence result by combining weak convergence methods and the modulated energy method. Our proof applies as long as the limiting mean curvature flow remains smooth.
APA, Harvard, Vancouver, ISO, and other styles
10

Pisipati, V. G. K. M., N. V. S. Rao, P. V. Datta Prasad, and P. R. Alapati. "Density, Refractive Index and Ultrasonic Velocity Studies Involving N-(p-n-Pentyloxybenzylidene)-p-n-octylaniline." Zeitschrift für Naturforschung A 40, no. 5 (1985): 472–75. http://dx.doi.org/10.1515/zna-1985-0509.

Full text
Abstract:
The density, refractive index and ultrasonic velocity dependence on temperature for N-(p-npentyloxybenzylidene)- p-n-octylaniline, 50.8, is presented. The compound 50.8 exhibits smectic-B, smectic-A and nematic phases between the solid and isotropic liquid phases. The nematic-isotropic and smectic A-smectic B phase transformations are found to be first order. The interesting smectic A - nematic transformation is confirmed from the results to be second order, although the thermal expansion coefficient and reported enthalpy data had suggested a weak first order transition. The computed adiabatic compressibility, βad, molar sound velocity, Rn, and molar compressibility Aw are presented.
APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic "Nematic-to-Isotropic Transition Temperature"

1

Wu, Chonggang. "Transesterification, Phase Transition, Rheology, and Mechanical Properties of Blends of Thermoplastic Polyester and Thermotropic Polyester." University of Akron / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=akron1143780405.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Nematic-to-Isotropic Transition Temperature"

1

Tsukiji, Tetsuhiro, and Tsuyoshi Mitani. "Influence of Electric Fields on Flow of Liquid Crystal Mixture in a Circular Tube With Electrode Surface." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45047.

Full text
Abstract:
Liquid crystal is one of functional fluids to control an apparent viscosity using an electric field intensity. It is also called ER (Electro-rheological) fluids. In the present experiment a liquid crystal mixture made of some kinds of the nematic liquid crystal is used. The responses of the pressure drop are examined when the liquid crystal mixture flows in a circular tube with the electrode walls on some parts of the inner surface of the tube for the constant flow rates. The four pair of the electrode is used and the voltages are added in the peripheral direction. When the voltages are applied on the liquid crystal mixture and removed, the pressure responses of the inlet of the circular tube are measured with the pressure transducer. On the other hand, the pulse-wave voltages are added to the electrodes to control the pressure drop using the pulse width modulation or the pulse frequency modulation. The diameter of the circular tube is 1.0mm. The isotropic-nematic transition is 90.0°C and smectic-nematic transition is −44.0°C for the liquid crystal mixture. The open-loop test facility with the liquid crystal mixture is set in a pyrostat to keep the temperature constant.
APA, Harvard, Vancouver, ISO, and other styles
2

Tsukiji, Tetsuhiro, and Tsuyoshi Mitani. "Influence of Electric Fields on Pressure Drop of Liquid Crystal Mixture." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32228.

Full text
Abstract:
Liquid crystal is one of homogeneous ER (Electrorheological) fluids in some range of temperature. In the present experiment a liquid crystal mixture is used. The responses of the pressure drop are examined when the liquid crystal mixture flows between two parallel-plate electrodes for the constant flow rates. When the voltages are applied on the liquid crystal mixture and removed, the pressure responses of the inlet electrodes are measured with the pressure transducer. At same time, the liquid crystal mixture between the transparent electrodes made of glass is visualized with the video camera investigate the time history of the director of the liquid crystal mixture. The AC voltages are also used to investigate dependence of the liquid crystal mixture on the frequency the voltages. Outlet of the flow channel with two parallel-plate electrodes is atmosphere. Relation between the flow visualization results and the changes of pressure drop investigated especially for transient period. On the other hand, the pulse-wave voltages are added to the electrodes to control the pressure drop using the pulse width modulation or the pulse frequency modulation. In the present study the flow rates change from 0.001cc/sec (velocity is lmm/sec) to 0.003cc/sec and the electric field intensity is from 0.2kV/mm to lkV/mm. The gap of the electrodes is 0.2mm.The isotropic-nematic transition is 90.0°C and smectic-nematic transition is −44.0°C for the liquid crystal mixture. The open-loop test facility the liquid crystal is set in a pyrostat to keep the temperature constant.
APA, Harvard, Vancouver, ISO, and other styles
3

Wellinghoff, S. T., D. P. Nicolella, D. P. Hanson, H. R. Rawls, and B. K. Norling. "Photopolymerizable Liquid Crystal Monomer-Oxide Nanoparticle Composites." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-39367.

Full text
Abstract:
Methacrylate and acrylate terminated monomers can be rapidly polymerized to polymer glasses useful in biomaterials, photolithography and rapid prototyping, optical coatings and composites. Unfortunately, polymerization shrinkage results in loss of tolerance and the development of internal stresses which can be especially critical in the case of highly crosslinked glasses. Structurally complicated oligomeric mixes of dimethacrylate monomers that exhibit a nematic liquid crystal to isotropic transition above room temperature have been synthesized in a low cost one pot synthesis to surmount the problem of polymerization shrinkage and the propensity of single component monomers to crystallize from the liquid state. Photopolymerization from the ordered liquid crystal state into a less ordered glass minimizes volumetric shrinkages to between 1–2% at greater than 90% polymerization conversion. These polymer glasses exhibited elastic bending moduli of 1.2 GPa to 1.5GPa, fracture strengths of 70–100MPa and fracture toughness of K=0.3–0.4 (MPa)1/2. In some cases the glasses exhibited ductile behavior which is unusual for highly crosslinked materials. Room temperature viscosities of 100P–2000P permit facile processing of the liquid crystal monomers with inorganic particles to make dental restorative composites.
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography