Depletion forces between particles immersed in nanofluids

Briscoe, Wuge H.

doi:10.1016/j.cocis.2014.12.002

Cited by 27 publications

(23 citation statements)

References 85 publications

(150 reference statements)

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“…Killing bacteria physically though nanostructures rather than chemical means has since become very topical, and several recent reviews on antimicrobial surfaces have focused on different types of antimicrobial coatings to prevent infections [14], [15], use of nanoparticles as antimicrobial agents [16], antimicrobial surfaces based on polymers [17] and other smart materials [18], [19], [20], [21], and naturally occurring antimicrobial surfaces [22], [23]. More generally, nanoparticle dispersions (nanofluids) [24], [25], [26] and nanostructured surfaces are increasingly found in modern formulations and technological applications for controlled adhesion or friction [27], [28], [29] and for enhanced or additional performance and functionalities [30]. Furthermore, the knowledge of nanostructure-bacteria interactions is also intimately related to the topic of nanotoxicity [31] and to our fundamental understanding of interactions between nanoparticles and organised soft matter [32], [33], [34].…”

Section: Introductionmentioning

confidence: 99%

Natural and bioinspired nanostructured bactericidal surfaces

Tripathy

Sen

et al. 2017

Advances in Colloid and Interface Science

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418

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Bacterial antibiotic resistance is becoming more widespread due to excessive use of antibiotics in healthcare and agriculture. At the same time the development of new antibiotics has effectively ground to a hold. Chemical modifications of material surfaces have poor long-term performance in preventing bacterial build-up and hence approaches for realising bactericidal action through physical surface topography have become increasingly important in recent years. The complex nature of the bacteria cell wall interactions with nanostructured surfaces represents many challenges while the design of nanostructured bactericidal surfaces is considered. Here we present a brief overview of the bactericidal behaviour of naturally occurring and bio-inspired nanostructured surfaces against different bacteria through the physico-mechanical rupture of the cell wall. Many parameters affect this process including the size, shape, density, rigidity/flexibility and surface chemistry of the surface nanotextures as well as factors such as bacteria specificity (e.g. gram positive and gram negative) and motility. Different fabrication methods for such bactericidal nanostructured surfaces are summarised.

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Section: Introductionmentioning

confidence: 99%

Natural and bioinspired nanostructured bactericidal surfaces

Tripathy

Sen

et al. 2017

Advances in Colloid and Interface Science

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418

376

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“…As is known, for a chain suspended in a crowded medium, there appears to be a depletion layer in the vicinity of the probed chain. Depletion originates from the fact that non-absorbing crowders tend to move away, avoiding a loss of configuration entropy [50]. An effective depletion force is generated, exerted on the pair of probed chain beads, which induces them to approach closer, resulting in chain collapse.…”

Section: Resultsmentioning

confidence: 99%

Crowding-Activity Coupling Effect on Conformational Change of a Semi-Flexible Polymer

2019

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The behavior of a polymer in a passive crowded medium or in a very dilute active bath has been well studied, while a polymer immersed in an environment featured by both crowding and activity remains an open problem. In this paper, a systematic Langevin simulation is performed to investigate the conformational change of a semi-flexible chain in a concentrated solution packed with spherical active crowders. A very novel shrinkage-to-swelling transition is observed for a polymer with small rigidity. The underlying phase diagram is constructed in the parameter space of active force and crowder size. Moreover, the variation of the polymer gyration radius demonstrates a non-monotonic dependence on the dynamical persistence length of the active particle. Lastly, the activity-crowding coupling effect in different crowder size baths is clarified. In the case of small crowders, activity strengthens the crowding-induced shrinkage to the chain. As crowder size increases, activity turns out to be a contrasting factor to crowding, resulting in a competitive shrinkage and swelling. In the large size situation, the swelling effect arising from activity eventually becomes dominant. The present study provides a deeper understanding of the unusual behavior of a semi-flexible polymer in an active and crowded medium, associated with the nontrivial activity-crowding coupling and the cooperative crowder size effect.

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“…Finally, a ternary mixture of large, middle-size and small particles are considered, and the effect of "condensation" of the middle-size particles on the surfaces of the large particles driven by the depletion effect of the small particles (the halo effect) is considered [16]. (iv) The effect of the geometrical shape of depletant particles (spheres, prolate and oblate ellipsoids, disks, needles) has been investigated by Piech and Walz [17] and reviewed by Briscoe [18]. Thus, for needles and disks the depletion energy is much higher than that for spheres, i.e.…”

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confidence: 99%

“…Depletion forces due to the proteins in such a crowded environment are conjectured to contribute to vesicular traffic/clustering, membrane fusion, actin bundling and amyloid fibril formation. Given the noncovalent nature of depletion forces, they are highly adaptable to dynamic cellular processes [18]. The DNA molecules are compacted in the central part of the cell owing to the depletion effect of proteins and ribosomes.…”

mentioning

confidence: 99%