Dynamics of density fluctuations in colloidal gels

Krall, A. H.; Huang, Zhaorong; Weitz, Dave

doi:10.1016/s0378-4371(96)00325-1

Cited by 30 publications

(36 citation statements)

References 18 publications

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“…The subsequent drop in R h,app after this point qualitatively indicates a decrease in the sample's characteristic relaxation time (gel stiffening). These observations are consistent with those previously reported in the literature for polymeric gels and fractal cluster gels of colloidal spheres [51,54]. However, Fig.…”

Section: Kinetics Of Gelationsupporting

confidence: 94%

“…Here I 0 and I denote the incident beam intensities before and after passing through the sample, respectively. Therefore, the effects of multiple scattering prevented measurements at φ > 5.0 × 10 −3 [51]. However, the arrest of f (q, t) for the flexible structures formed at φ < 5.0 × 10 −3 was only detectable at the smallest q attainable by our instrument.…”

Section: Dynamic Structure Of Colloidal Gelsmentioning

confidence: 89%

“…Carboxyl-modified colloidal polystyrene spheres with diameter a = 41 nm (Seradyn, Indianapolis, IN) were used for some studies. Measurements on these systems were performed in density-matching solvents of H 2 O and D 2 O [50,51]. Aggregation in the DLCA and RLCA regimes was induced by [MgCl 2 ] = 9 mM and [NaCl] = 5 mM, respectively [50,52].…”

Section: Methodsmentioning

confidence: 99%

“…The qualitative differences observed between Figs. 2a and 2b are generally independent of the kinetics of aggregation [51,55]. We will discuss possible reasons for these qualitative differences in the sections that follow.…”

Section: Kinetics Of Gelationmentioning

confidence: 99%

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Gelation and internal dynamics of colloidal rod aggregates

Mohraz¹,

Solomon²

2006

Journal of Colloid and Interface Science

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Section: Kinetics Of Gelationsupporting

confidence: 94%

Section: Dynamic Structure Of Colloidal Gelsmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

Section: Kinetics Of Gelationmentioning

confidence: 99%

See 2 more Smart Citations

Gelation and internal dynamics of colloidal rod aggregates

Mohraz¹,

Solomon²

2006

Journal of Colloid and Interface Science

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“…It is important to note that the complete relaxation of g (2) (q,t) is not due to an improper normalization. 143,144 This is because here the intercept of g (2) (q,t) at t-0 increases during the sol-gel transition. The lack of static frozen-in components is supported by the sample-position-independent scattering intensity; for example, no speckle was detected when we randomly turned the LLS cell to let the laser hit different parts of the gel.…”

Section: The Slow Mode In Peo-ppo-peo/h 2 O Systemmentioning

confidence: 96%

The slow relaxation mode: from solutions to gel networks

Ngai

2010

Polym J

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In the past, many laser light-scattering experimental results revealed that besides the fast relaxation mode, there existed an additional slow mode in semidilute solutions. This slow mode has been assigned to a variety of origins, but there has been no clear and well-accepted explanation. As the polymer concentration increases, the slow relaxation mode persists in the concentrated region, in melts and in gels in which polymer chains are crosslinked instead of entangled. The slow relaxation mode has also been reported for charged macromolecules in aqueous and nonaqueous solutions. However, it is generally thought to be different in nature from that observed in semidilute neutral polymer solution. In recent years, armed with novel solution preparation methods and some specially designed polymers, we have reexamined the dynamics of polymer chains, especially the slow mode, in semidilute neutral polymer solutions, dilute polyelectrolyte solutions and gels, which are reviewed here. Our results suggest that the slow mode can be qualitatively considered as hindered motions of interacting chains even though the nature of interaction can be very different; namely, from the weak segment-segment interaction in a less good solvent to strong electrostatic interaction among polyelectrolyte chains, and even to chemical crosslinking inside gel networks.

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Gel‐Like Structure of a Hexadecyl Derivative of Hyaluronic Acid for the Treatment of Osteoarthritis

Finelli

Chiessi

Galesso

et al. 2009

Macromolecular Bioscience

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Hyaluronic acid is a polysaccharide with viscoelastic and mechanical properties that are crucial for the normal functioning of osteoarticular junctions. It is demonstrated that introduction of a hexadecyl side chain into HA yields an injectable polysaccharide capable of forming physical hydrogels, which are stable at very low polymer concentrations, whereas native hyaluronic acid forms viscous solutions at concentrations that are ten times higher. Characterization of this system showed that the driving force for its gel-like behavior is the occurrence of hydrophobic interactions involving aliphatic side chains, despite the low degree of substitution, as confirmed by molecular dynamics simulations of HYADD4 and HA hydrogels.

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Dynamics of density fluctuations in colloidal gels

Cited by 30 publications

References 18 publications

Gelation and internal dynamics of colloidal rod aggregates

Gelation and internal dynamics of colloidal rod aggregates

The slow relaxation mode: from solutions to gel networks

Gel‐Like Structure of a Hexadecyl Derivative of Hyaluronic Acid for the Treatment of Osteoarthritis

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