NDLI: Ionic screening and dissociation are crucial for understanding chemical self-propulsion in polar solvents

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Single file dynamics in soft materials

Spontaneous formation of nanometer scale tubular vesicles in aqueous mixtures of lipid and block copolymer amphiphiles

Light-induced displacement of a microbead through the thermal expansion of liquid crystals

Interaction of organic ions with proteins

Foundation of correlation ellipsometry

Casimir effect between pinned particles in two-dimensional jammed systems

Melting upon cooling and freezing upon heating: fluid–solid phase diagram for Švejk–Hašek model of dimerizing hard spheres

A family of mechanically adaptive supramolecular graphene oxide/poly(ethylenimine) hydrogels from aqueous assembly

Phase behaviour and temperature-responsive properties of a gemini surfactant/Brij-30/water system

A pH-responsive wormlike micellar system of a noncovalent interaction-based surfactant with a tunable molecular structure

The glass transition and interfacial dynamics of single strand fibers of polymers

Ionic screening and dissociation are crucial for understanding chemical self-propulsion in polar solvents

Flory theory of randomly branched polymers

Effective viscosity and dynamics of spreading epithelia: a solvable model

Insight into the cryopolymerization to form a poly(N-isopropylacrylamide)/clay macroporous gel: structure and phase evolution

Defect driven shapes in nematic droplets: analogies with cell division

Analytical form of the autocorrelation function for the fluorescence correlation spectroscopy

Kinetics of polymer collapse: effect of temperature on cluster growth and aging

Vesicle formation by proton transfer driven short-tailed fatty acids of C4–C8 chain length in water

Optical control of surface forces and instabilities in foam films using photosurfactants

A biomass approach to mendable bio-elastomers

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Ionic screening and dissociation are crucial for understanding chemical self-propulsion in polar solvents

Content Provider	Royal Society of Chemistry (RSC)
Author	Holm, Christian Brown, Aidan T. Poon, Wilson C. K. Graaf, Joost de
Copyright Year	2017
Abstract	Polar solvents like water support the bulk dissociation of themselves and their solutes into ions, and the re-association of these ions into neutral molecules in a dynamic equilibrium, e.g., H2O2 ⇌ H+ + HO2−. Using continuum theory, we study the influence of these association–dissociation reactions on the self-propulsion of colloids driven by surface chemical reactions (chemical swimmers). We find that association–dissociation reactions should have a strong influence on swimmers' behaviour, and therefore should be included in future modelling. In particular, such bulk reactions should permit charged swimmers to propel electrophoretically even if all species involved in the surface reactions are neutral. The bulk reactions also significantly modify the predicted speed of chemical swimmers propelled by ionic currents, by up to an order of magnitude. For swimmers whose surface reactions produce both anions and cations (ionic self-diffusiophoresis), the bulk reactions produce an additional reactive screening length, analogous to the Debye length in electrostatics. This in turn leads to an inverse relationship between swimmer radius and swimming speed, which could provide an alternative explanation for recent experimental observations on Pt-polystyrene Janus swimmers [S. Ebbens et al., Phys. Rev. E: Stat., Nonlinear, Soft Matter Phys., 2012, 85, 020401]. We also use our continuum theory to investigate the effect of the Debye screening length itself, going beyond the infinitely-thin-screening-length approximation used by previous analytical theories. We identify significant departures from this limiting behaviour for micron-sized swimmers under typical experimental conditions and find that the approximation fails entirely for nanoscale swimmers.
Starting Page	1200
Ending Page	1222
Page Count	23
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	13
Issue Number	6
Journal	Soft Matter
DOI	10.1039/c6sm01867j
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Hydrogen peroxide Ebbens Janus Intermolecular force Paralympic swimming Hydronium Soft matter Dissociative Propel mometasone furoate implant Electrostatics Dynamic equilibrium
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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