Static light scattering by aqueous solutions of rodlike fd-virus particles

Hagenbüchle, M.; Weyerich, B.; Deggelmann, M.; Gräf, Christian; Krause, R.; Maier, Erich E.; Schulz, Susanne; Klein, R.; Weber, R.

doi:10.1016/0378-4371(90)90215-e

Cited by 36 publications

(29 citation statements)

References 17 publications

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“…The q À2:5 dependency at small qL is caused by the liquid like structure factor as the concentration of fd-PNIPAM particles is about 100 times the overlap concentration. Similar liquidlike structures have been observed for suspensions of bare fd-virus particles at low ionic strengths [Hagenböchle et al (1990); Schulz et al (1991)].…”

Section: B Determination Of Gel Structure By Scatteringsupporting

confidence: 77%

Probing structure in colloidal gels of thermoreversible rodlike virus particles: Rheology and scattering

Reddy¹,

Zhang²,

Lettinga³

et al. 2012

Journal of Rheology

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Aggregated suspensions of rodlike particles are commonly encountered in soft biological materials and their solidlike response at extremely low volume fractions is also exploited technologically. Understanding the link between the physicochemical parameters such as size, aspect ratio, volume fraction, and interparticle forces with the resulting microstructure and the subsequent rheological response remains challenging. In the present work, suspensions of monodisperse rodlike virus particles, whose surface is modified by grafting with a thermoreversible polymer poly(N-isopropylacrylamide), are used as a model system. The repulsive and attractive contributions to the total interaction potential can be changed independently by varying the ionic strength and the temperature. The effects of these changes on the strength and structure of gels have been studied near the gel transition using a combination of rheological and scattering measurements. Rheological measurements of the near critical gel properties as a function of concentration and ionic strength proved to be more sensitive compared to scattering in resolving the structural differences. A percolating structure can be formed at very low volume fractions, which show a weak dependence on the ionic strength with the anisotropy of the repulsive interactions playing the main role in creating more "open" structures. The intrinsic stiffness of the rodlike particles does not affect the moduli of the gel states very strongly. V

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Section: B Determination Of Gel Structure By Scatteringsupporting

confidence: 77%

Probing structure in colloidal gels of thermoreversible rodlike virus particles: Rheology and scattering

Reddy¹,

Zhang²,

Lettinga³

et al. 2012

Journal of Rheology

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“…For a size distribution of such cores the large clusters will strongly influence the concentration dependence, because interaction energies scale with magnetic moment squared and thus with the radius to the power six (Eq. [5]). In such clusters, incidentally, the (total) moment probably cannot rotate inside the crystal lattice.…”

Section: Dynamic Light Scatteringmentioning

confidence: 93%

Interactions between Silica Colloids with Magnetite Cores: Diffusion, Sedimentation and Light Scattering

Donselaar

Philipse

1999

Journal of Colloid and Interface Science

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“…Since then a flurry of experimental and theoretical investigations followed. Recent experiments, mainly for TMV, have essentially contributed to our understanding of the structural and dynamical correlations in the disordered phase [8] and have also revealed a complex phase diagram including nematic [9], smectic [10], columnar [11], and crystalline phases. Despite these numerous investigations, the full phase diagram for TMV is still not entirely understood over the full range of densities and added salt concentrations.…”

Section: Hartmut Lowenmentioning

confidence: 99%

Interaction between charged rodlike colloidal particles

Löwen¹

1994

Phys. Rev. Lett.

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The interactions and correlations of charged rodlike colloidal particles are investigated using an ab initio approach which includes many-body inter-rod forces induced by nonlinear counterion screening. It is found that these forces can satisfactorily be described by an eAective Yukawa segment model which in general differs from the traditional Derjaguin-Landau-Verwey-Overbeek theory. Whereas no simple analytical expression for the Yukawa parameters is available for the disordered phase, an exactly soluble cylindrical cell model reproduces the ab initio data quite well in the liquid-crystalline phase. PACS numbers: 82.70.Dd, 61.20.6y, 61.30. -v Charge-stabilized colloidal suspensions of rigid rodlike particles represent excellent realizations of liquid-crystalline systems on a mesoscopic length scale [1,2]. There are quite a number of concrete examples ranging from concentrated aqueous suspensions of tobacco-mosaic viruses (TMV) [3] or bacterial fd viruses [4] to cylindrical micellar aggregates [5] and ellipsoidal polystyrene latex particles [6]. In 1936 the first experimental proof of liquid-crystalline order was given by Bawden et al. [7] using a TMV suspension. Since then a flurry of experimental and theoretical investigations followed. Recent experiments, mainly for TMV, have essentially contributed to our understanding of the structural and dynamical correlations in the disordered phase [8] and have also revealed a complex phase diagram including nematic [9], smectic [10], columnar [11], and crystalline phases. Despite these numerous investigations, the full phase diagram for TMV is still not entirely understood over the full range of densities and added salt concentrations.Theoretically the knowledge of correlations and the phase diagram of a rodlike charged suspension is rather rudimentary, since the form of the inter-rod forces which is a necessary basic input for any statistical mechanics theory is not known exactly. Up to now theoretical work was directed along two lines. First the screened electrostatic interaction between rods was mapped onto that of hard spherocylinders [10,12] where the phase diagram is known [13]. This idea was first indicated by Onsager [14]. In view of the fact that the phase diagram depends sensitively on details of the interaction it becomes clear that this approach is too crude if quantitative predictions on correlations and on the complexity of the phase diagram are demanded. Second a more realistic description of the rod interaction was introduced and discussed by Klein and co-workers [15]. They studied a model of segments with point charges along the rods interacting via a pairwise Yukawa potential according to the classic Derjaguin-Landau-Verwey-Overbeek (DLVO) [16] theory of linear screening. This model is only justified in the limit of infinite dilution [17] but fails in the regime of strong interaction where liquid-solid phase transformations take place.In this Letter, ab initio simulations for charged rods in a salt-free suspension are reported based on the adiabatic "...

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Static light scattering by aqueous solutions of rodlike fd-virus particles

Cited by 36 publications

References 17 publications

Probing structure in colloidal gels of thermoreversible rodlike virus particles: Rheology and scattering

Probing structure in colloidal gels of thermoreversible rodlike virus particles: Rheology and scattering

Interactions between Silica Colloids with Magnetite Cores: Diffusion, Sedimentation and Light Scattering

Interaction between charged rodlike colloidal particles

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