Liquidlike order of charged rodlike particle solutions

Maier, Erich E.; Krause, R.; Deggelmann, M.; Hagenbuechle, Martin; Weber, R.; Fraden, Seth

doi:10.1021/ma00029a019

Cited by 102 publications

(112 citation statements)

References 17 publications

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“…However, it is difficult to obtain an accurate estimate of the intensity I͑0,q z ͒ for q z → 0 as the intensity is a rapidly varying function of q z near the origin. While the well-pronounced intensity peak as observed in x-ray diffraction experiments of suspensions of a colloidal fd virus and TMV [10,16] is missing in our I͑q ជ͒, we do clearly observe a very broad peak in the structure factor, as found Fig. 6 for finite L / D), we obtain an intensity peak similar to the one found in experiments.…”

Section: Resultssupporting

confidence: 84%

“…Figures 5(b)-5(d) show the intensity scatter for the nematic phase at varying . We observe the typical anisotropic pattern of the scattering as also found experimentally for nematic solutions of the TMV and fd virus [10,16].…”

Section: Resultssupporting

confidence: 80%

“…When the structure factor peak is sharper, one expects that S͑q ជ͒ approaches 1 more rapidly and that the influence of the structure factor and correlations become less important in the determination of the nematic order parameter and the ODF from intensity scatter. One might also argue that a more pronounced structure factor peak as expected at higher aspect ratios of the rods may yield a peak in the intensity scatter as observed experimentally [10,16], but which was never predicted theoretically [20]. This will be investigated in a future work.…”

Section: Discussionmentioning

confidence: 78%

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Accuracy of measuring the nematic order from intensity scatter: A simulation study

Savenko

Dijkstra

2004

Phys. Rev. E

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The determination of the nematic order parameter S and the orientational distribution function (ODF) from scattering data involve severe approximations. The validity of these are studied here using Monte-Carlo simulations of hard spherocylinders with an aspect ratio of 15 for varying densities in the isotropic and nematic phase. The "exact" ODF of the rods, the "exact" value of S, and the intensity scatter I͑q ជ͒ are determined directly in simulation. In addition, we determine the ODF and S from the simulated intensity scatter which includes spatial and orientational correlations of the particles. We investigate whether correlations present in the interparticle scatter influences the determination of the single particle orientational distribution function by comparing the results obtained from scattering with the "exact" results measured directly in our simulations. We find that the nematic order parameter determined from the intensity scatter underestimates the actual value by 2 -9%. We also find that the values of S and the ODF are insensitive to the absolute value of the scattering vector for 1.2 Ͻ ͉q ជ͉D Ͻ 2 which agrees well with the assumption proposed by Leadbetter that I͑q , ͒ along the equatorial arc is independent of ͉q ជ͉. We also observe that the best fit of the "exact" ODF is given by the Maier-Saupe distribution when nematic director fluctuations are ignored, while the Gaussian distributions provides the best fit when these fluctuations are included.

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Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 80%

Section: Discussionmentioning

confidence: 78%

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Accuracy of measuring the nematic order from intensity scatter: A simulation study

Savenko

Dijkstra

2004

Phys. Rev. E

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“…The increasing salt content at constant fd-Y21M concentration as well as an increase of the temperature will decrease the structure between the rod-like particles. 62 Regarding these two aspects we do not find a correlation with the thermal diffusion coeffcient. While D T increase with increasing temperature it decreases with increasing salt content.…”

Section: Temperature Influencementioning

confidence: 61%

Thermal Diffusion of a Stiff Rod-Like Mutant Y21M fd-Virus

et al. 2011

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We investigated the thermal diffusion phenomena of a rod-like mutant filamentous fd-Y21M virus in the isotropic phase, by means of an improved infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS) set-up crucial for measurements of slowly diffusing systems.Since this is the first thermal diffusion study of a stiff anisotropic solute, we investigate the influence of the shape anisotropy on the thermal diffusion behavior. The influence of temperature, fd-Y21M concentration and ionic strength in relation with the thermodiffusion properties is discussed. We characterize and eliminate the effect of these parameters on the absolute diffusion of the rods and show that diffusion determines the behavior of the Soret coefficient because the thermal diffusion coefficient is constant in the investigate regime. Our results indicate that for the thermal diffusion behavior structural changes of the surrounding water are more important than structural changes between the charged macroions. In the investigated temperature and concentration range, the fd-Y21M virus is thermophobic for the low salt content, while the solutions with the high salt content change from thermophobic to thermophilic behavior with decreasing the temperature. A comparison with recent measurements of other charged soft and biological matter systems shows that the shape anisotropy of the fd-virus becomes not visible in the results.

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“…The inequalities (13) mean that there are many charges per rod or per locally stiff persistent segment. For most of the experimental examples mentioned the inequalities (12) and (13) are always valid.…”

Section: Lomentioning

confidence: 99%

Liquid‐crystalline ordering in solutions of polyelectrolytes

Nyrkova

Shusharina

Khokhlov

1997

Macro Theory & Simulations

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SUMMARYThe isotropic-nematic phase transition in solutions of stiff-chain polyelectrolytes is considered on the basis of the Onsager approach for the limiting cases of charged rods and persistent macrolecules. We plotted a full family of phase diagrams for orientational transitions in solutions of polyelectrolytes with any charge density as a function of the low-molecular-weight salt concentration. It is shown that charging of macromolecules can lead not only to the renormalization of the chain diameter (discussed by Onsager) or to the twisting effect (predicted by Odijk et al.), but in some cases also to a variety of other regimes, including transitions with very narrow phase separation regions, or with a second orientational transition to a highly oriented nematic phase upon the increase of polymer concentration.

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Liquidlike order of charged rodlike particle solutions

Cited by 102 publications

References 17 publications

Accuracy of measuring the nematic order from intensity scatter: A simulation study

Accuracy of measuring the nematic order from intensity scatter: A simulation study

Thermal Diffusion of a Stiff Rod-Like Mutant Y21M fd-Virus

Liquid‐crystalline ordering in solutions of polyelectrolytes

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