Searched for: subject:"liquid%5C+crystals"
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Tummers, M.J. (author), Steunebrink, M. (author)
This paper reports on an experimental study of the effects of surface roughness on the flow and heat transfer in cubical Rayleigh-Bénard convection cells for Rayleigh numbers between 10<sup>7</sup> and 10<sup>10</sup>. In the rough cells the top and bottom surfaces are equipped with square arrays of copper cubes. In line with other studies,...
journal article 2019
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Ataei Dadavi, I. (author), Chakkingal, M. (author), Kenjeres, S. (author), Kleijn, C.R. (author), Tummers, M.J. (author)
This paper reports on an experimental study of natural convection in an enclosure that is heated at the bottom and cooled at the top, filled with a packed bed of relatively large solid spheres. Nusselt numbers were measured for various sphere conductivities, spheres sizes and sphere packings for Rayleigh numbers varying between 10<sup>7</sup>...
journal article 2019
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Oyarzún Rivera, B.A. (author)
Monte Carlo simulations were performed in the NPT ensemble and in an expanded version of the Gibbs ensemble. The phase behavior of single-phase hard-sphere chain fluids was determined using NPT ensemble simulations, while the isotropic-nematic phase equilibrium of single-component and binary mixtures of hard-sphere and Lennard-Jones fluids was...
doctoral thesis 2016
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Van Westen, T. (author)
In this thesis I aim to contribute to a molecular understanding and -description of the phase behaviour of liquid crystalline materials. In particular, I aim at the development of a molecular-based equation of state (EoS) for describing nematic (only orientationally ordered) liquid crystals (LCs) and their mixtures. Special emphasis is put on...
doctoral thesis 2015
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Gao, J. (author)
Two sulfonated aramids, poly(2,2’-disulfonylbenzidine terephthalamide) (PBDT) and poly(2,2’-disulfonylbenzidine isophthalamide) (PBDI) were synthesized with the aim to explore their unique morphology for proton exchange membrane applications. Due to the different polymer structures, PBDT forms a nematic liquid crystal, whereas PBDI is isotropic....
doctoral thesis 2015
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Oyarzun, B. (author), Van Westen, T. (author), Vlugt, T.J.H. (author)
The isotropic-nematic phase equilibria of linear hard-sphere chains and binary mixtures of them are obtained from Monte Carlo simulations. In addition, the infinite dilution solubility of hard spheres in the coexisting isotropic and nematic phases is determined. Phase equilibria calculations are performed in an expanded formulation of the Gibbs...
journal article 2015
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Van Westen, T. (author), Oyarzun, B. (author), Vlugt, T.J.H. (author), Gross, J. (author)
An extension of Onsager's second virial theory is developed to describe the isotropic-nematic phase transition of tangent hard-sphere chain fluids. Flexibility is introduced by the rod-coil model. The effect of chain-flexibility on the second virial coefficient is described using an accurate, analytical approximation for the orientation...
journal article 2013
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Oyarzun, B.A. (author), Van Westen, T. (author), Vlugt, T.J.H. (author)
he liquid crystal phase behavior of linear and partially flexible hard-sphere chain fluids and the solubility of hard spheres in hard-sphere chain fluids are studied by constant pressure Monte Carlo simulations. An extensive study on the phase behavior of linear fluids with a length of 7, 8, 9, 10, 11, 12, 13, 14, 15, and 20 beads is carried out...
journal article 2013
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Haverkate, L.A. (author)
This thesis explores some fundamental aspects of charge carrier transport at the nanoscale. The study is divided in two parts. In the first part, the structural, dynamical and vibrational properties of discotic liquid crystals are studied in relation to the potential of these self-assembled ‘mesophases’ to form molecular conducting wires....
doctoral thesis 2013
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Van Westen, T. (author), Vlugt, T.J.H. (author), Gross, J. (author)
Onsager-like theories are commonly used to describe the phase behavior of nematic (only orientationally ordered) liquid crystals. A key ingredient in such theories is the orientation-dependent excluded volume of two molecules. Although for hard convex molecular models this is generally known in analytical form, for more realistic molecular...
journal article 2012
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Kuiper, S. (author)
The performance of opto-electronic devices based on semi-conducting organic molecules, dependence on the molecular order of the semi-conducting molecules. To get high charge transportation through the material a high order of the material is needed. In our research we used liquid crystalline phases to get relative high order over large distances...
doctoral thesis 2011
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Eichhorn, S.H. (author), Shuai, C. (author), Ahmida, M. (author), Demenev, A. (author), Kayal, H. (author), Raad, F.S. (author), Kaafarani, B.R. (author), Patwardhan, S. (author), Grozema, F.C. (author), Siebbeles, L.D.A. (author), Taerum, T. (author), Perepichka, D.F. (author), Klenkler, R. (author)
Donor-acceptor structures have recently gained great popularity for the design of low band gap polymeric organic semiconductors. Presented here is a first systematic study of organic semiconductors based on columnar liquid crystals that consist of discotic and board-shaped donor-acceptor structures. The discotic benzotristhiophenetricarboxamide...
conference paper 2011
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Patwardhan, S. (author)
The field of organic electronics has been thriving for the last decades due to growing commercial interest. One of the advantages of using organic materials as semiconductors is the possibility to tune their optoelectronic properties by modifying the chemical structure and organization of the building blocks. In this thesis, the properties of...
doctoral thesis 2011
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Dündar, M.A. (author), Christova, C. (author), Silov, A.Y. (author), Karouta, F. (author), Nötzel, R. (author), Wienk, M. (author), Salemink, H. (author), Van der Heijden, R.W. (author)
Liquid crystal (LC, Merk 5 CB) is infiltrated into active, InAs quantum dots embedded, InGaAsP membrane type nanocavities to investigate the possible effect of the LC orientation on active cavity tuning. The tuning is demonstrated thermally and thermo-optically. The thermal tuning showed that the cavity modes can be tuned in opposite directions...
conference paper 2010
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Dündar, M.A. (author), Christova, C. (author), Silov, A.Y. (author), Karouta, F. (author), Nötzel, R. (author), Wienk, M. (author), Salemink, H. (author), Van der Heijden, R. (author)
Liquid crystal (LC, Merk 5 CB) is infiltrated into active, InAs quantum dots embedded, InGaAsP membrane type nanocavities to investigate the possible effect of the LC orientation on active cavity tuning. The tuning is demonstrated thermally and thermo-optically. The thermal tuning showed that the cavity modes can be tuned in opposite directions...
conference paper 2010
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Sluijter, M. (author)
When the optical behavior of light in a medium depends on the direction in which light is traveling, the medium is called optically anisotropic. Light is an electromagnetic wave and in this thesis, we discuss the electromagnetic theory on optical anisotropy. We do this with the assumption that the wavelength of light approaches zero. The field...
doctoral thesis 2010
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Dündar, M.A. (author), Kicken, H.H.J.E. (author), Silov, A.Y. (author), Nötzel, R. (author), Karouta, F. (author), Salemink, H.W.M. (author), Van der Heijden, R.W. (author)
Mode-dependent shifts of resonant frequencies of cavities in liquid crystal (LC) infiltrated planar photonic crystals (PhC) are experimentally observed when the temperature is varied across the LC ordering transition. The shifts can be in opposite directions, even for two very similar nearly degenerate modes. The behavior is attributed to the...
journal article 2009
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Kotlewski, A. (author)
Organogels and liquid crystals are both well known classes of materials covering a broad spectrum of molecules, structures and morphologies. In this thesis characterization of novel triphenylene based organogels is described in connection with the mesomorphic liquid crystalline properties of the pure materials. In the course of this study...
doctoral thesis 2009
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Xu, M. (author)
Diffraction gratings are being used to manipulate light in many different applications, such as in flat panel display systems, modern lighting systems, and optical recording. Diffraction gratings can be made polarization selective due to form birefringence. An alternative approach to polarization selective gratings is to use birefringent...
doctoral thesis 2009
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Sluijter, M. (author), De Boer, D.K.G. (author), Urbach, H.P. (author)
Firm evidence of the biaxial nematic phase in liquid crystals, not induced by a magnetic or electric field, has been established only recently. The discovery of these biaxially anisotropic liquid crystals has opened up new areas of both fundamental and applied research. The advances in biaxial liquid crystal-related topics call for a good...
journal article 2009
Searched for: subject:"liquid%5C+crystals"
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