Superhydrophilic Polyelectrolyte Brush Layers with Imparted Anti-Icing Properties: Effect of Counter ions

Chernyy, Sergey; Järn, Mikael; Shimizu, Kyoko; Swerin, Agne; Pedersen, Steen Uttrup; Daasbjerg, Kim; Makkonen, Lasse; Claesson, Per M.; Iruthayaraj, Joseph

doi:10.1021/am500046d

Cited by 126 publications

(132 citation statements)

References 50 publications

(84 reference statements)

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“…[9][10][11] In this paper the approach was to generate the anchored organic layer by covalently linking polymer brushes to the surface utilizing a surface-immobilized initiator, thus a "grafting from" 3 approach. 3,[12][13][14][15] As the polymer brushes are miscible with the incoming bulk polymer then mixing and/or entanglement of the surface-confined polymer brushes into the bulk polymer is expected.…”

Section: Introductionmentioning

confidence: 99%

Improved Adhesion Between PMMA and Stainless Steel Modified with PMMA Brushes

Shimizu

Malmos

Holm

et al. 2014

ACS Appl. Mater. Interfaces

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In this work, various lengths and densities of poly(methyl methacrylate) (PMMA) brushes were synthesized on stainless steel (SS) surfaces via surface initiated atom transfer radical polymerization. Subsequently, the joints between the bulk PMMA and the PMMA brushed stainless steel were obtained by injection molding, and for these the degree of adhesion was assessed by tensile testing. Several conditions are required to facilitate the mixing between the brushes and the bulk polymer and to reduce the residual stress at the interface: preheating of the SS samples before the injection molding; a long packing time; and a mold temperature above the glass transition temperature (Tg) of PMMA during the injection molding. This treatment leads to a cohesive failure in the bulk PMMA. It was observed that the stress concentrated at the rim, due to contraction of bulk PMMA during cooling, results in a weak adhesion at the rim of the joint. A combination of high density and long brush length of PMMA film provides better adhesion. The large number of PMMA brush chains apparently promotes good penetration into the bulk PMMA chains and ultimately results in high adhesion strength.

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Section: Introductionmentioning

confidence: 99%

Improved Adhesion Between PMMA and Stainless Steel Modified with PMMA Brushes

Shimizu

Malmos

Holm

et al. 2014

ACS Appl. Mater. Interfaces

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“…This is important for many applications in biocompatibility, where the same principles of solvation shells in interfacial water structure, and displacement of proteins with water result in tunable biomacromolecular adhesion [162][163][164]. There are distinct design implications of changes in near-surface concentration for amphiphilic anti-icing hierarchies [153] discussed earlier, as also the design and performance of de-icing macromolecules. For example, the surface conformations of ethylene glycol (EG) and its behavior as a hydrogen-bond acceptor which leads to various solvation shells at the EG-water interface and low probability of EG-EG complexation has been noted as key to its anti-icing behavior [102].…”

Section: Role Of Interfacial Watermentioning

confidence: 99%

“…A less complex hierarchy of superhydrophilic polyelectrolyte brushes hosting ions is also along the lines of inspiration from natural processes such as cloud and hydrate formation. The "hosted ion" architecture, an under-explored design theme, is able to control ice adhesion through a dispersed ion population with varying results for different ions [153,154]. For a Li + ion, the reduction (in ice adhesion) is ca.…”

Section: Biomimetic Designmentioning

confidence: 99%

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On Modulating Interfacial Structure towards Improved Anti-Icing Performance

et al. 2016

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Abstract:The design of anti-icing surfaces presents an interface with high causal density that has been challenging to quantify in terms of individual contributions of various interactions and environmental factors. In this commentary, we highlight the role of interfacial water structure as uniquely expressing the physico-chemical aspects of ice accretion. Recent work on the topic that focuses on control of interfacial structure is discussed along with results by our research group on wettability of chemically modified surfaces and the role of ions in modulating interfacial structure. Suggestions for systematic studies to understand the fundamental interactions at play in ice adhesion at interfaces are made especially in the under-explored areas of cooperative hydrogen bonding and the role of solvated counterions. Insights expected from such studies would contribute to design of robust anti-icing hierarchies.

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“…The most favourable solution of the icing problem is the design of passive polymeric or polymeric/hybrid anti-icing coatings, i.e. 19,20 For example, hydrophilic polymers reduce the water freezing point, and ice crystals can simply slide off due to the presence of an unfrozen water layer. 1,2 Such surfaces are typically based on the reduction of the ice adhesion, or inhibition of the ice growth.…”

Section: Introductionmentioning

confidence: 99%

New insight into icing and de-icing properties of hydrophobic and hydrophilic structured surfaces based on core–shell particles

et al. 2015

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Icing is an important problem, which often leads to emergency situations in northern countries. The reduction of icing requires a detailed understanding of this process. In this work, we report on a systematic investigation of the effects of geometry and chemical properties of surfaces on the formation of an ice layer, its properties, and thawing. We compare in detail icing and ice thawing on flat and rough hydrophilic and hydrophobic surfaces. We also show advantages and disadvantages of the surfaces of each kind. We demonstrate that water condenses in a liquid form, leading to the formation of a thin continuous water layer on a hydrophilic surface. Meanwhile, separated rounded water droplets are formed on hydrophobic surfaces. As a result of slower heat exchange, the freezing of rounded water droplets on a hydrophobic surface occurs later than the freezing of the continuous water layer on a hydrophilic one. Moreover, growth of ice on hydrophobic surfaces is slower than on the hydrophilic ones, because ice grows due to the condensation of water vapor on already formed ice crystals, and not due to the condensation on the polymer surface. Rough hydrophobic surfaces also demonstrate a very low ice adhesion value, which is because of the reduced contact area with ice. The main disadvantage of hydrophobic and superhydrophobic surfaces is the pinning of water droplets on them after thawing. Flat hydrophilic poly(ethylene glycol)-modified surfaces also exhibit very low ice adhesion, which is due to the very low freezing point of the water-poly(ethylene glycol) mixtures. Water easily leaves from flat hydrophilic poly(ethylene glycol)-modified surfaces, and they quickly become dry. However, the ice growth rate on poly(ethylene glycol)-modified hydrophilic surfaces is the highest. These results indicate that neither purely (super)hydrophobic polymeric surfaces, nor "antifreeze" hydrophilic ones provide an ideal solution to the problem of icing.

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Superhydrophilic Polyelectrolyte Brush Layers with Imparted Anti-Icing Properties: Effect of Counter ions

Cited by 126 publications

References 50 publications

Improved Adhesion Between PMMA and Stainless Steel Modified with PMMA Brushes

Improved Adhesion Between PMMA and Stainless Steel Modified with PMMA Brushes

On Modulating Interfacial Structure towards Improved Anti-Icing Performance

New insight into icing and de-icing properties of hydrophobic and hydrophilic structured surfaces based on core–shell particles

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