Adhesion between oppositely charged polyelectrolytes

Alfhaid, Latifah; Spina, Rita La; Tomlinson, M.; Hall, Amy R.; Seddon, William D.; Williams, Nicholas H.; Cousin, Fabrice; Gorb, Stanislav N.; Geoghegan, Mark

doi:10.1080/00218464.2016.1265947

Cited by 7 publications

(26 citation statements)

References 36 publications

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“…The work of adhesion, Wadh, is very large and reflects the large stresses in these systems. 13 It is also likely that some of the gels have undergone plastic deformation, under which circumstances Equation (2) is not an accurate measure of the thermodynamic adhesion.…”

Section: Comparing the Effect Of Salt And Ph Solutionsmentioning

confidence: 99%

“…12 Nevertheless, when one of the components is not a polyelectrolyte, hydrogen bonding can be the determining parameter in pH-controlled switchable adhesion. 6 In the case of the oppositely charged polyelectrolytes, the adhesion typically fails cohesively in water, 13 limiting the scope for reuse of the couple. Strengthening the PMAA hydrogel with poly[oligo(ethylene glycol)methyl ether methacrylate] (POEGMA) to form a double-network hydrogel improved the repeatability of the adhesion, so that the couple could be mechanically detached and reattached in water.…”

Section: Introductionmentioning

confidence: 99%

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Adhesion between oppositely charged polyelectrolytes in salt solution

Alfhaid

Williams

Geoghegan

2020

J of Applied Polymer Sci

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The adhesion at the aqueous interface between a polyacid hydrogel and a grafted polycation layer (brush) is shown to be reversible on the addition of sodium chloride, which screens the charges on the gel and brush. Furthermore it is shown that a double-network hydrogel both exhibits adhesive failure and stronger adhesion with the brush than a simple poly(methacrylic acid) [PMAA] hydrogel, whereas the PMAA gel undergoes cohesive failure on detachment. The adhesive force at the hydrogel-brush interface significantly increases after adding dilute salt solution (of 0.001 M). Once the concentration of salt solution is raised above 0.05 M, both the adhesive force and work done in detaching both single-and doublenetwork hydrogels from the brush surface are notably reduced. This result confirms that reversible adhesion between a hydrogel and polymer brush in salt solutions is possible, although a double-network gel is required for adhesive failure.

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Section: Comparing the Effect Of Salt And Ph Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adhesion between oppositely charged polyelectrolytes in salt solution

Alfhaid

Williams

Geoghegan

2020

J of Applied Polymer Sci

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“…In turn, the covalent or non-covalent bonds formed at the interface will then be subjected to the ability of the PE material itself to remain strong (cohesion) as the interface bond to achieve stability of the bioadhesive whilst adapting to the external environmental conditions [ 115 , 116 ]. The adhesion interactions can thereby be interpreted by the thermodynamic work of adhesion, derived from the Johnson–Kendall–Roberts behaviour, as discussed in previous studies [ 117 , 118 ]. Briefly, one can determine the work of adhesion for bioadhesive PE gels from the relationship between the maximum force required to break a bond (interface or internal) and the size of the gel.…”

Section: Fabrication Of Different Types Of Pe Gelsmentioning

confidence: 99%

“…Moreover, investigation of counterion condensation at different pH levels resulted in different adhesion strengths between both the brush and gel when the constituents were swapped around. The changes were suggested to occur due to the brush’s grafting density, which is associated with thickness, resulting in an increase in the electrostatic energy of the counterions [ 118 ]. Comparatively, the presence of weak cations compared to stronger cations was significantly affected by pH conditions.…”

Section: Fabrication Of Different Types Of Pe Gelsmentioning

confidence: 99%

Polyelectrolyte Gels: Fundamentals, Fabrication and Applications

Wanasingha¹,

Dorishetty²,

Dutta³

et al. 2021

Gels

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Polyelectrolyte gels are an important class of polymer gels and a versatile platform with charged polymer networks with ionisable groups. They have drawn significant recent attention as a class of smart material and have demonstrated potential for a variety of applications. This review begins with the fundamentals of polyelectrolyte gels, which encompass various classifications (i.e., origin, charge, shape) and crucial aspects (ionic conductivity and stimuli responsiveness). It further centralises recent developments of polyelectrolyte gels, emphasising their synthesis, structure–property relationships and responsive properties. Sequentially, this review demonstrates how polyelectrolyte gels’ flourishing properties create attractiveness to a range of applications including tissue engineering, drug delivery, actuators and bioelectronics. Finally, the review outlines the indisputable appeal, further improvements and emerging trends in polyelectrolyte gels.

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“…The thickness of the brush is found to have a significant effect. [92] When considering extreme conditions of boundary lubrication, both pressure and shear are significant. Ideally, studies under shear would also be in-situ due to the non-equilibrium nature of these conditions.…”

Section: Extreme Conditionsmentioning

confidence: 99%

New insights into the solid–liquid interface exploiting neutron reflectivity

Welbourn¹,

Clarke

2019

Current Opinion in Colloid & Interface Science

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We outline recent progress exploiting neutron reflectivity for structural and compositional investigations of the solid-liquid interface. There has been extensive activity in this area, with key areas of development: (i) an increased range of accessible substrates (e.g. metals and minerals), (ii) novel liquid phases, and (iii) strong themes in electrochemistry (e.g. batteries), corrosion, polymers and increasing application of extreme conditions.

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Adhesion between oppositely charged polyelectrolytes

Cited by 7 publications

References 36 publications

Adhesion between oppositely charged polyelectrolytes in salt solution

Adhesion between oppositely charged polyelectrolytes in salt solution

Polyelectrolyte Gels: Fundamentals, Fabrication and Applications

New insights into the solid–liquid interface exploiting neutron reflectivity

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