Thermomechanical Mechanisms of Reducing Ice Adhesion on Superhydrophobic Surfaces

Cohen, Noy; Dotan, A.; Dodiuk, H.; Kenig, S.

doi:10.1021/acs.langmuir.6b02495

Cited by 24 publications

(14 citation statements)

References 48 publications

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“…Rq is commonly used to characterize surface roughness and is an indication of statistical surface height. A higher Rq value means a rougher surface, while a lower Rq value indicates a smoother surface [16,52,53]. As can be noticed Error!…”

Section: Confocal Morphology Analysismentioning

confidence: 82%

Hybrid Sol–Gel Superhydrophobic Coatings Based on Alkyl Silane-Modified Nanosilica

et al. 2021

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Hybrid sol–gel superhydrophobic coatings based on alkyl silane-modified nanosilica were synthesized and studied. The hybrid coatings were synthesized using the classic Stöber process for producing hydrophilic silica nanoparticles (NPs) modified by the in-situ addition of long-chain alkyl silanes co-precursors in addition to the common tetraethyl orthosilicate (TEOS). It was demonstrated that the long-chain alkyl substituent silane induced a steric hindrance effect, slowing the alkylsilane self-condensation and allowing for the condensation of the TEOS to produce the silica NPs. Hence, following the formation of the silica NPs the alkylsilane reacted with the silica’s hydroxyls to yield hybrid alkyl-modified silica NPs having superhydrophobic (SH) attributes. The resulting SH coatings were characterized by contact angle goniometry, demonstrating a more than 150° water contact angle, a water sliding angle of less than 5°, and a transmittance of more than 90%. Confocal microscopy was used to analyze the micro random surface morphology of the SH surface and to indicate the parameters related to superhydrophobicity. It was found that a SH coating could be obtained when the alkyl length exceeded ten carbons, exhibiting a raspberry-like hierarchical morphology.

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Section: Confocal Morphology Analysismentioning

confidence: 82%

Hybrid Sol–Gel Superhydrophobic Coatings Based on Alkyl Silane-Modified Nanosilica

et al. 2021

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“…The resultant situation is that triggering ice nucleation gets more difficulty due to the increasing energy barrier, finally showing a certain extent of icing‐delay performance . Furthermore, the air pockets can be remained after freezing and serve as the original microcracks to reduce the ice adhesion strength, resulting in the adhered ice being extremely easily removed . After a comprehensive insight into these reported literatures, the real anti‐icing potential of hierarchical micro‐nanostructure superhydrophobic surface needs to be further confirmed in the involved application environments due to the obvious distinction (several orders of magnitude) of the volume of reference supercooled droplets.…”

Section: Introductionmentioning

confidence: 94%

“…The more detailed operating procedures are provided in Experimental Section. According to the previous experience and classical wetting theory, the HN‐Surface is expected to entrap more air pockets underneath the droplets and exhibit more robust water repellence than the SN‐Surface . Also, the anti‐icing performance should display the similar situation.…”

Section: Introductionmentioning

confidence: 94%

Anti‐Icing Performance of Superhydrophobic Texture Surfaces Depending on Reference Environments

Shen

Wang

Tao

et al. 2017

Adv Materials Inter

101

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mightily appeal to many researchers to develop an anti-icing method without energy consumption by mimicking the plant surface topographies. [1][2][3][4][5][6] As well known, the famous Lotus Effect is widely used and induces to construct the hierarchical topography of composite micronanostructures in favor of entrapping more air pockets to repel water and finally realize the aim of preventing ice accumulation. [7][8][9][10][11] Also, many theoretical and experimental studies have been reported that the trapped air pockets play a thermal insulation role in preventing the freezing of supercooled water, and cause a remarkable reduction in solid/liquid contact area. [8,9,12,13] The resultant situation is that triggering ice nucleation gets more difficulty due to the increasing energy barrier, finally showing a certain extent of icingdelay performance. [14,15] Furthermore, the air pockets can be remained after freezing and serve as the original microcracks to reduce the ice adhesion strength, resulting in the adhered ice being extremely easily removed. [16][17][18] After a comprehensive insight into these reported literatures, the real anti-icing potential of hierarchical micro-nanostructure superhydrophobic surface needs to be further confirmed in the involved application environments due to the obvious distinction (several orders of magnitude) of the volume of reference supercooled droplets.We, therefore, made great efforts to verify the anti-icing capacity of hierarchical micro-nanostructure surfaces through modeling the application environments, not only the routine analyses in laboratory. Here, this work developed both routes to fabricate the superhydrophobic structure surfaces (see Figure 1a), hierarchical micro-nanostructure and single nanostructure surfaces, which were also labeled as hierarchical micronanostructure surface (HN-Surface) and single nanostructure surface (SN-Surface), respectively. The more detailed operating procedures are provided in Experimental Section. According to the previous experience and classical wetting theory, the HN-Surface is expected to entrap more air pockets underneath the droplets and exhibit more robust water repellence than the SN-Surface. [17,19,20] Also, the anti-icing performance should display the similar situation. The supercooled droplets on HN-Surface will take more time to complete the freezing process, and the produced ice can be easily removed under the action of slight external force due to the lower ice adhesion.Materials decorated by the hierarchical micro-nanostructures similar to lotus leaf surface topographies are firmly considered to possess the substantial anti-icing functions, showing icing-delay and low ice adhesion. Here, the aim of this work is to verify the anti-icing capacity in the actual icing environment containing supercooled airflow. This study, therefore, develops both routes to fabricate the hierarchical micro-nanostructure and single nanostructure superhydrophobic surfaces, and first evaluates their anti-icing capacity based on the routine mea...

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“…With the development of the material preparation processes, researchers have made material surfaces superhydrophobic by changing the micromorphology of the material surface or coating low-surface-energy materials [20][21][22][23][24][25]. After fabricating the superhydrophobic surfaces with nano/micro-roughness on different substrates, Cohen et al [26] found that superhydrophobic surfaces could significantly reduce the ice adhesion strength. Spitzner et al [27] coated pyroelectric polymer polyvinylidene fluoride on a glass surface to prepare a superhydrophobic film on the substrate surface and found the freezing of water into ice was delayed.…”

Section: Introductionmentioning

confidence: 99%

Effects of Discontinuous Thermal Conductivity of a Substrate Surface on Ice Adhesion Strength

Chen

Liu

et al. 2021

JMSE

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This study proposes a novel anti-icing model in which silicone rubber with low thermal conductivity is coated at different positions on a material surface to change the continuity of the thermal conductivity of the surface. During the test, the surfaces of aluminum alloy and polymethyl methacrylate (PMMA) are discontinuously coated with silicone rubber. Repeated experiments are conducted to verify the anti-icing effect of the proposed model. Results showed that compared to the conventional surface ice adhesion strength, the rate of reduction of the ice adhesion strength of the aluminum alloy and PMMA could reach 75.07% and 76.70%, respectively, when the novel method is used. Because of the different levels of thermal conductivity at different positions on the material surface, the water attached to the surface locations without the coated silicone rubber had other freezing times. Combined with the heat and phase change of water during the freezing process, changing the stability of the interface between the ice and substrate could act as an active anti-icing power. The ice adhesion strength on the material surface could then be reduced. Compared with the conventional anti-icing methods, the anti-icing method proposed in this study could significantly increase the active anti-icing characteristics of the material and provide a novel anti-icing method for use in engineering applications.

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Thermomechanical Mechanisms of Reducing Ice Adhesion on Superhydrophobic Surfaces

Cited by 24 publications

References 48 publications

Hybrid Sol–Gel Superhydrophobic Coatings Based on Alkyl Silane-Modified Nanosilica

Hybrid Sol–Gel Superhydrophobic Coatings Based on Alkyl Silane-Modified Nanosilica

Anti‐Icing Performance of Superhydrophobic Texture Surfaces Depending on Reference Environments

Effects of Discontinuous Thermal Conductivity of a Substrate Surface on Ice Adhesion Strength

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