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Intracellular sensing and cell diagnostics using fluorescent silica nanoparticles

Relaxation dynamics in single polymer microcapsules probed with laser-generated GHz acoustic waves

Direct visualization of shear dependent silk fibrillogenesis

Reverse thermal gelation of aromatic solvents by a series of easily accessible organic salt based gelators

Electrowetting on curved surfaces

Viscoplasticity and stratified flow of colloid suspensions

Pathway-dependent re-assembly of dual-responsive ABC terpolymer in water

pH-responsive dendrimers interacting with lipid membranes

Anisotropic liquid penetration arising from a cross-sectional wettability gradient

Slow and remanent electric polarization of adsorbed BSA layer evidenced by neutron reflection

PEG-urokinase nanogels with enhanced stability and controllable bioactivity

Importance of the dynamics of adsorption and of a transient interfacial stress on the formation of aggregates of IgG antibodies

Thermoresponsive behavior of an LCST-type polymer based on a pyrrolidone structure in aqueous solution

Unexpected liquid crystalline behaviour of three-ring bent-core mesogens: bis(4-subst.-phenyl) 2-methyl-iso-phthalates

The impact and spreading of a small liquid drop on a non-porous substrate over an extended time scale

Polymer–inorganic hybrid microparticles with hierarchical structures formed by interfacial instabilities of emulsion droplets

Influence of observation temperature on light scattering of poly-N-isopropylacrylamide hydrogels

Colloids in one dimensional random energy landscapes

Unravelling the nanometre-scale stimuli-responsive properties of natural rubber latex particles using atomic force microscopy

Effect of swelling and deswelling on the elasticity of polymer networks in the dilute to semi-dilute region

Thermoresponsive triblock copolymers based on methacrylate monomers: effect of molecular weight and composition

Hydrophobic interactions between polymer surfaces: using polystyrene as a model system

Assembly of biomacromolecule loaded polyelectrolyte multilayer capsules by using water soluble sacrificial templates

Driven polymer translocation through a cylindrical nanochannel: interplay between the channel length and the chain length

Use of magnetic hydrazide-modified polymer microspheres for enrichment of Francisella tularensis glycoproteins

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Hydrophobic interactions between polymer surfaces: using polystyrene as a model system

Content Provider	Royal Society of Chemistry (RSC)
Author	Faghihnejad, Ali Zeng, Hongbo
Copyright Year	2012
Abstract	The hydrophobic interaction plays a critical role in a wide range of molecular phenomena in numerous biological and engineering systems. Using a Surface Forces Apparatus (SFA) coupled with a top-view optical microscope, we have directly measured and visualized the interactions between two polystyrene surfaces in different electrolyte solutions (i.e., NaCl, CaCl2, HCl and CH3COOH). It is evident that the long-range hydrophobic interaction measured is due to bridging of microscopic and sub-microscopic bubbles on polystyrene surfaces. The range of the hydrophobic interaction decreases with increasing the electrolyte concentration for NaCl and CaCl2, but shows no significant change for HCl and CH3COOH, which is related to the formation and stability of bubbles on hydrophobic surfaces due to the ion specificity. The range of the hydrophobic interactions was reduced to about 10–20 nm by degassing the aqueous solutions, but gradually recovered when re-exposing the degassed solution to air. Our results indicate that dissolved gasses in solutions play a crucial role in the hydrophobic interactions of polymer surfaces, and support a three-regime hydrophobic interaction model proposed. More interesting, spontaneous cavitation of water between two interacting polystyrene surfaces was directly observed in degassed aqueous solution at a separation of ≤20 nm. The interfacial energy of polystyrene in various aqueous solutions was determined to be γ = 42 ± 5 mJ m−2, close to the values measured in air. Interesting fracture patterns were also observed associated with the separation of two hydrophobic polymer surfaces in aqueous solutions, but not in air, indicating that hydrophobic force plays an important role in adhesion-induced fracture of polymer surfaces and thin films. Our study provides new insight into the basic hydrophobic interaction mechanism of polymers and biomacromolecules.
Starting Page	2746
Ending Page	2759
Page Count	14
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	8
Issue Number	9
Journal	Soft Matter
DOI	10.1039/c2sm07150a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Electrolyte Critical Role Optical microscope Hydrophobic effect Ion Polymer Biomacromolecules Hydrophobe Hydrogen chloride Surface forces apparatus Polystyrene Cavitation
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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Hydrophobic interactions between polymer surfaces: using polystyrene as a model system

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Hydrophobic interactions between polymer surfaces: using polystyrene as a model system

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