Droplet freezing and ice adhesion strength measurement on super-cooled hydrophobic surfaces

McDonald, Brendan; Patel, Poonam; Zhao, Boxin

doi:10.1080/00218464.2015.1077329

Cited by 11 publications

(8 citation statements)

References 23 publications

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“…illustrates the time evolution of the appearance freezing water droplet under the 'Experiment 1' conditions. As shown in figure, the freezing process can be divided into five stages: initially, water droplet got muddy and lost its transparency; at the same time, the contact area between the droplet and the surface of aluminum alloy increased; then, phase change and solidification processes started, followed by freezing of the water droplet and changes in the surface morphology of ice (in agreement withArianpour et al, 2013 andMcDonald et al, 2017); finally, frost was formed on the outer-shell of ice (images 16 to 20 inFig. 5).…”

supporting

confidence: 56%

“…Chaudhary et al, 2014;Fumoto et al, 2012). McDonald et al (2017) studied the crystallization of a droplet on super-cooled hydrophobic surfaces and measured the ice adhesion strength, which was essential for understanding the influence of the surface characteristics on the freezing process and developing a method to measure the ice adhesion strength on SHS.…”

Section: Introductionmentioning

confidence: 99%

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Influence of substrate initial temperature on adhesion strength of ice on aluminum alloy

Chen

Cong

Sun

et al. 2018

Cold Regions Science and Technology

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The present work investigates the influence of the initial temperature of a substrate on the ice adhesion strength by analyzing the freezing characteristics of water droplets adhered to the substrate. The ice adhesion strength on 6061 aluminum alloy was measured using a dedicated strength testing apparatus, and the freezing process of water droplets at different initial temperatures of the alloy surface was examined with a microscope. The results of the experiments show that the ice adhesion strength on the aluminum alloy surface at ambient temperature was twice as large as that measured on a colder surface (e.g.,-5 °C). Combining the experimental results with the microscopic observation of the freezing process revealed that at high initial surface temperature (i.e. equal to 18 °C), the water droplets thoroughly spread on the aluminum alloy surface at high temperature, formed a larger contact area. In addition, the initial surface

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supporting

confidence: 56%

Section: Introductionmentioning

confidence: 99%

Influence of substrate initial temperature on adhesion strength of ice on aluminum alloy

Chen

Cong

Sun

et al. 2018

Cold Regions Science and Technology

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“…Since there is not a commercially available instrument used in the low temperature system, and the adhesive strength is sometimes too low to measure accurately. Generally, the vertical or tangential adhesive strength of ice on material surface is measured [25,26] . In our laboratory, a simple and fast instrument (the inset in Figure 5) are self‐designed to measure the vertical adhesive strength of ice on PU porous films.…”

Section: Resultsmentioning

confidence: 99%

Facile preparation and strong adhesive strength of honeycomb polyurethane films with small pore diameter

Zhang

Xue

Luo

et al. 2020

J of Applied Polymer Sci

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With the continuous development of bionics, such as, geckos and virginia creeper with both superhydrophobic and super‐adhesive, the surface wetting and super‐adhesive properties of various porous materials have attracted extensive attention of the scientific and medical communities. Here, the honeycomb polyurethane (PU) porous films with strong adhesion were successfully prepared by microphase separation method and the effects of growth parameters on their microstructure and adhesive strength to ice were investigated. It was found that a high relative humidity (e.g., 100%) and a low solution concentration (e.g., 2%) facilitated the formation of ordered honeycomb PU porous films, and as‐prepared PU pores with average pore diameter as small as 5 μm are better ordered and more uniform than these in related documents. Although the contact angle of water droplets on the surface of PU porous films increased from the premodification value of 85–130° to more than 160° after surface modification with polydopamine (PDA), the corresponding rolling angle remained approximately constant (180°), indicating that the surface of PU porous films has strong adhesion similar to geckos and virginia creeper. Furthermore, at lower temperature, the PU porous films exhibited the high adhesive strength of 142.13 kPa on ice, which was strongly dependent on the porous microstructures and surface compositions. The improved adhesive behavior to ice of honeycomb PU porous films modified with PDA provides new strategies for surface modification of materials and potential applications in medical domain.

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“…While various methods exist to test ice adhesion on a flat surface, the vast majority can be classified into two main categories: direct mechanical testing and centrifuge testing. Mechanical testing is identified by its direct approach to dislodge the ice, and mechanical force is applied directly to the ice to free it from the material being tested [19][20][21], while in centrifuge tests, centrifugal force dislodges the ice from the material [19][20][21][22][23][24][25], utilizing indirect forces. While direct mechanical and centrifuge testing represent the majority of the research found in the current literature [11][12][13][14][15][20][21][22][23][24], additional miscellaneous tests have emerged that involve various apparatuses and methodologies, and these will be discussed separately in this review.…”

Section: Ice Adhesion Testing Methodsmentioning

confidence: 99%

Current Ice Adhesion Testing Methods and the Need for a Standard: A Concise Review

Bleszynski

Clark

2021

Standards

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Ice accretion is a serious problem in cold climates, causing automobile and airplane accidents, as well as severe economic losses throughout various sectors. To combat these issues, many solutions have been developed, such as de-icing materials, which can delay or prevent the adhesion of ice to a surface through chemical, temperature, or physical means. To effectively assess the properties of a de-icing material, ice adhesion testing must be conducted, of which there are numerous types, each with their own characteristics. Unfortunately, the same material, tested with different methods, may provide very different ice adhesion values. This makes it difficult to properly characterize a material’s de-icing properties and compare values across the literature. In this review, we identified the main ice adhesion testing methods and compared ice adhesion values for a particular material with different testing methods. We then discussed some of the main issues with current ice testing methods and identified some of the main factors that may affect ice adhesion values, namely ice quality and the use of a mold, which may significantly affect the final ice adhesion results. Finally, we proposed a new, simple standard testing method, in an attempt to eliminate some of the issues with current ice testing methods.

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Droplet freezing and ice adhesion strength measurement on super-cooled hydrophobic surfaces

Cited by 11 publications

References 23 publications

Influence of substrate initial temperature on adhesion strength of ice on aluminum alloy

Influence of substrate initial temperature on adhesion strength of ice on aluminum alloy

Facile preparation and strong adhesive strength of honeycomb polyurethane films with small pore diameter

Current Ice Adhesion Testing Methods and the Need for a Standard: A Concise Review

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