Polymeric stabilization of colloidal dispersions. By D. H. Napper, Academic Press, London, 1984. pp. xviii + 428, price £39.50, $65.00. ISBN 0‐12‐513980‐2

Dunn, A. S.

doi:10.1002/pi.4980180420

Cited by 16 publications

(8 citation statements)

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“…Overall, although our system is not at equilibrium at these short timescales, we found trends consistent with what has been observed in the literature for depletion interactions with sterically stabilized particles (Vincent et al, 1986a; Cowell et al, 1978; Vincent et al, 1980; Clarke and Vincent, 1981; Feigin and Napper, 1980; Vincent et al, 1986b; Gast and Leibler, 1986; Jones and Vincent, 1989; Napper, 1983). At dilute polymer concentrations, the extent of aggregation increased with concentration.…”

Section: Resultssupporting

confidence: 90%

“…Some groups have explicitly accounted for the effects of the grafted polymer layer used to sterically stabilize colloids when studying interactions between polymer solutions and colloids (Vincent et al, 1986a; Cowell et al, 1978; Vincent et al, 1980; Clarke and Vincent, 1981; Feigin and Napper, 1980; Vincent et al, 1986b; Gast and Leibler, 1986; Jones and Vincent, 1989; Napper, 1983); this includes groups studying mixtures of polystyrene particles sterically stabilized with grafted layers of PEG (MWs of 750 Da and 2 kDa) and aqueous solutions of free PEG polymer (MW from 200 Da to 300 kDa) (Cowell et al, 1978; Vincent et al, 1980). It has been found experimentally that in mixtures of polymers and sterically stabilized colloids, the colloids form aggregates above a threshold polymer concentration.…”

Section: Resultsmentioning

confidence: 99%

“…We applied previously established theoretical frameworks that combine depletion interactions with steric interactions to better understand our system (Vincent et al, 1986a; Feigin and Napper, 1980; Napper, 1983). To account for the depletion attractions between colloids we used the Asakura–Oosawa (AO) potential (U dep ) (Asakura and Oosawa, 1954; Asakura and Oosawa, 1958; Vrij, 1976):true01em4ptUdep(r)= {1em4pt+∞ for r ≤0−2πΠPa(RP−r2)2for 0<r<2RP0 for r>2RPtruetruetrue…”

Section: Resultsmentioning

confidence: 99%

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High-molecular-weight polymers from dietary fiber drive aggregation of particulates in the murine small intestine

Steinberg

Datta

Naragon

et al. 2019

eLife

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The lumen of the small intestine (SI) is filled with particulates: microbes, therapeutic particles, and food granules. The structure of this particulate suspension could impact uptake of drugs and nutrients and the function of microorganisms; however, little is understood about how this suspension is re-structured as it transits the gut. Here, we demonstrate that particles spontaneously aggregate in SI luminal fluid ex vivo. We find that mucins and immunoglobulins are not required for aggregation. Instead, aggregation can be controlled using polymers from dietary fiber in a manner that is qualitatively consistent with polymer-induced depletion interactions, which do not require specific chemical interactions. Furthermore, we find that aggregation is tunable; by feeding mice dietary fibers of different molecular weights, we can control aggregation in SI luminal fluid. This work suggests that the molecular weight and concentration of dietary polymers play an underappreciated role in shaping the physicochemical environment of the gut.Editorial note: This article has been through an editorial process in which the authors decide how to respond to the issues raised during peer review. The Reviewing Editor's assessment is that all the issues have been addressed (see decision letter).

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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High-molecular-weight polymers from dietary fiber drive aggregation of particulates in the murine small intestine

Steinberg

Datta

Naragon

et al. 2019

eLife

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“…Recently much attentions have been paid to polymer brushes composed of polymer chains tethered to a substrate surface, which triggered a lot of applications, such as colloidal stabilization, adhesion, biocompatibility, and tribology [1][2][3]. Since Alexander, de Gennes and Semenov made pioneering investigations on polymer brushes [4][5][6], a large number of progresses have been made in this field [7].…”

Section: Introductionmentioning

confidence: 99%

Chain stiffness effect on the properties of topological polymer brushes and the penetration by free chains using MD simulation

Lyu

Merlitz

et al. 2018

J. Phys. Commun.

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Molecular dynamic simulations are carried out to study the static and dynamic properties of topological polymer brushes by taking into account chain stiffness and their topological feature. It is found that chain stiffness plays an important role in topological polymer brushes, and there exists scaling laws for the radius of gyration against chain stiffness and topological feature, indicating that bending interaction is as important as topological constraint. An empirical finitely extensible nonlinear elastic force in terms of chain stiffness and topological features is also obtained by fitting related parameters. A simulation on the invasion of free polymer chains from environment into a ring polymer brush shows that under pressure, such kind of penetration depends largely on chain stiffness, in contrast to the minor influence of topological structure, which seems to be suppressed.

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“…6,7 In colloidal suspensions, it has been used to tune the interactions between the colloidal particles and thereby control their assembly behavior. For example, densely grafted chains can generate effective steric repulsions between colloidal particles and thereby prevent flocculation; 8 grafted-chain-driven associations can direct the assembly of nanoparticles into colloidal polymers or networks. 9 In biosystems, the lipid tails in the membrane form a typical structure of brush; arrays of cilia are also of brush-like structure but of much larger size (micrometer) than the conventional molecular brush.…”

Section: Introductionmentioning

confidence: 99%

Brush in the bath of active particles: Anomalous stretching of chains and distribution of particles

Zhang

et al. 2015

The Journal of Chemical Physics

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The interaction between polymer brush and colloidal particles has been intensively studied in the last two decades. Here we consider a flat chain-grafted substrate immersed in a bath of active particles. Simulations show that an increase in the self-propelling force causes an increase in the number of particles that penetrate into the brush. Anomalously, the particle density inside the main body of the brush eventually becomes higher than that outside the brush at very large selfpropelling force. The grafted chains are further stretched due to the steric repulsion from the intruded particles. Upon the increase of the self-propelling force, distinct stretching behaviors of chains were observed for low and high grafting densities. Surprisingly, we found a weak descent of the end-to-end distance of chains for high grafting density and very large force which is reminiscent of the compression effect of a chain in the active bath.

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Polymeric stabilization of colloidal dispersions. By D. H. Napper, Academic Press, London, 1984. pp. xviii + 428, price £39.50, $65.00. ISBN 0‐12‐513980‐2

Cited by 16 publications

References 0 publications

High-molecular-weight polymers from dietary fiber drive aggregation of particulates in the murine small intestine

High-molecular-weight polymers from dietary fiber drive aggregation of particulates in the murine small intestine

Chain stiffness effect on the properties of topological polymer brushes and the penetration by free chains using MD simulation

Brush in the bath of active particles: Anomalous stretching of chains and distribution of particles

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