Switching the Properties of Polyelectrolyte Brushes via “Hydrophobic Collapse”

Azzaroni, Omar; Moya, Sergio; Farhan, Tamer; Brown, and Andrew A.; Huck, Wilhelm T. S.

doi:10.1021/ma051549r

Cited by 178 publications

(239 citation statements)

References 55 publications

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“…[12] Moreover, we also observed that coordination of similar brushes with ClO 4 -rendered the surface hydrophobic. [13] Our previous work on studying the strong impact of counterions on the overall properties of polyelectrolyte brushes paved the way for the idea of creating surfaces with easily tunable wetting properties. This Research News article attempts to give an overview of the recent developments in the field and explores how supramolecular chemistry based on ion pairing can be used to tune the wettability in a rational manner.…”

Section: Introductionmentioning

confidence: 99%

Tunable Wettability by Clicking Counterions Into Polyelectrolyte Brushes

2006

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Polymer brushes have recently emerged as an extremely versatile way to modify surface properties in a robust and controlled way. The introduction of responsive polymers and block copolymers in polymer‐brush systems has also opened up new routes to ‘smart' surfaces with switchable surface properties. Here, the use of polyelectrolyte brushes as a supramolecular platform for the immobilization of a wide range of species, leading to a tunable wettability of substrates, is presented.

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Section: Introductionmentioning

confidence: 99%

Tunable Wettability by Clicking Counterions Into Polyelectrolyte Brushes

2006

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“…This phenomenon was also observed by other groups and was termed as the hydrophobic collapsed state. 31 The thickness ratio (h water /h dry ) decreased following the counter-anion order:…”

Section: Resultsmentioning

confidence: 99%

Ion-specific ice propagation behavior on polyelectrolyte brush surfaces

Liu

et al. 2017

RSC Adv.

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Ice propagation is an essential step when freezing happens on hydrated surfaces. In this work, we choose polyelectrolyte brushes (PB), whose hydration ability can be controlled by simply exchanging the counterions, to demonstrate the distinct ice propagation mechanism on differently hydrated surfaces.Undesired ice formation on solid surfaces, such as wind turbine blades, power network towers and transmission lines, heat exchanger surfaces and wings of aircra, causes serious property losses and safety risks for human beings.1-3 Therefore, there has been continuous interest in the design and construction of effective and low-cost anti-icing and anti-frost materials. Recently some icephobic surfaces have been proposed in avoiding/retarding undesired ice formation.4-11 In particular, numerous hydrated surface materials have been utilized for ghting against icing, e.g., surfaces with a delayed freezing time of water droplets and surfaces with lowered adhesion to formed ice. 12-15The ice formation on solid surface always goes through several processes: ice nucleation, growth and propagation. 16-21In real-world conditions, even if the ice nucleation can be avoided effectively, the runaway ice propagation will result in failure of anti-icing coatings. Actually, the ice propagation control is crucial for the anti-icing strategies due to the unavoidable ice nucleation arising from the ambient contaminants like impurities or dusts. Though the control of ice propagation has been reported on the lubricant-infused surfaces and superhydrophobic surfaces with different structures, few studies have been performed on the hydrated surfaces. 10,22Unlike most of inorganic or metallic surfaces, the hydrated surfaces contain a high content of interfacial water. The different states of hydration will play an important role on the ice propagation on the hydrated surfaces other than the wellstudied effect like thermal conductivity, humidity and pressure.5,23,24 Therefore, it is highly desired to study the ice propagation on various hydrated surfaces as well as the underlying mechanism.Polyelectrolyte brush (PB) surfaces, whose hydration state can be controlled simply by exchanging the counterions, were utilized as the research platform.25-29 Previously, we have studied the ion-specic effect on heterogeneous ice nucleation on polyelectrolyte brush (PB) surfaces.30 Herein, we nd that the ice propagation can also be tuned on the PB surfaces by changing their hydration state. Ice propagation rates were observed to be ve orders of magnitude faster on the highly hydrated PB surfaces with hydrophilic counterions than that on the dehydrated PB surfaces with hydrophobic counterions. Owing to the ubiquity of ice formation on hydrated surfaces in biological and climate elds, our ndings can shed new light upon the anti-icing studies. Results and discussionThe as-prepared PMETA-Cl brush underwent a transition from a hydrophilic state to a hydrophobic state by exchanging Cl According to X-ray photoelectron spectroscopy (XPS) results, all the co...

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“…Moreover, polymers with charged species such as polyelectrolytes were also used to change the surface wettability [5][6][7][8][9][10][11][12][13][14][15]. brushes could be modified with appropriate counter-ions [12][13][14][15] using poly(2-methacryl poly oxyethyl trimethylammonium chloride) (PMETAC) and poly(2-dimethylaminoethyl methacrylate chloride) (PDMAEMAC).…”

Section: Ion Exchangementioning

confidence: 99%

“…brushes could be modified with appropriate counter-ions [12][13][14][15] using poly(2-methacryl poly oxyethyl trimethylammonium chloride) (PMETAC) and poly(2-dimethylaminoethyl methacrylate chloride) (PDMAEMAC).…”

Section: Ion Exchangementioning

confidence: 99%

Switchable and Reversible Superhydrophobic Surfaces: Part Two

Taleb¹,

Darmanin²,

Guittard³

2018

Interdisciplinary Expansions in Engineering and Design With the Power of Biomimicry

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In this book chapter, most of the methods used in the literature to prepare switchable and reversible superhydrophobic surfaces are described. Inspired by Nature, it is possible to induce the Cassie-Baxter-Wenzel transition using different external stimuli such as light, temperature, pH, ion exchange, voltage, magnetic field, mechanic stress, plasma, ultrasonication, solvent, gas or guest. Such properties are extremely important for various applications but especially for controllable oil/water separation membranes, oil-absorbing materials, and water harvesting systems.Keywords: superhydrophobic, reversible, switchable, bioinspiration, biomimetism Reversible superhydrophobic surfaces: Part twoThis section provides continuation of the description of the stimuli used in the literature to induce reversible changes in surface wettability. Ion exchangeSince 2004, the researchers have shown that the presence of charged species such as quaternary ammonium groups are sensitive to ion exchange and lead to different surface wettabilities. In 2004, Choi et al. prepared self-assembled monolayers (SAM) with imidazolium groups on smooth Au and Si/SiO 2 substrates [1][2][3]. They studied the effect of a series of anions as shown in Figure 1 and In order to elaborate reversible superhydrophobic properties by ion exchange, gold micro and nanostructured substrates were performed by electroless etching process by immersing silicon substrates in aqueous solution of HAuCl 4 and HF (Figure 2). The surface was then modified by SAM using a thiol terminated by a quaternary ammonium. Then, the surface wettability could be reversely changed from superhydrophilic to superhydrophobic after [20]. Here, the presence of TSPM (sol-gel precursor) was used not only to form a polymer network via intramolecular interactions but also to anchor substrates (Figure 3). The membranes could reversely change from superhydrophobic/highly oleophobic to superhydrophilic/superoleophobic after exchanging Cl − ions by heptadecafluorooctanesulfonic acid (C 8 F 17 SO 3 − or HPS − ) ions. Moreover, the membranes were also highly efficient filter medium for removing multiple contaminants such as SO 2 form waster gas streams. A nother strategy was to deposit polyelectrolyte multilayers poly(diallyldimethylammonium chloride (PDDA) and poly(sodium 4-styrenesulfonate) (PSS) on gold micro and nanostructured substrates [21]. The authors studied the influence of the exchanged ions and the highest properties were obtained by exchanging Cl − (θ w < 5°) ions by PFO − (θ w = 164°). The authors also deposited polyelectrolyte multilayers on micro and nanostructured aluminum substrates obtained by etching in HCl and immersion in boiling water [22,23]. Using PFO − ions, the substrates were superhydrophobic and superoleophobic. When the substrates were immersed in seawater, the PFO − ions were exchanged by hydrophilic Cl − or SO 4 2− making the substrates underwater superoleophobic. Magnetic fieldEnvironment protection against oil leakage during oil tankers sinking is ...

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Switching the Properties of Polyelectrolyte Brushes via “Hydrophobic Collapse”

Cited by 178 publications

References 55 publications

Tunable Wettability by Clicking Counterions Into Polyelectrolyte Brushes

Tunable Wettability by Clicking Counterions Into Polyelectrolyte Brushes

Ion-specific ice propagation behavior on polyelectrolyte brush surfaces

Switchable and Reversible Superhydrophobic Surfaces: Part Two

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