The Effect of Surface Roughness on Apparent Contact Angles and on Contact Angle Hysteresis. I. The system Paraffin–Water–Air

Bartell, F. E.; Shepard, J. W.

doi:10.1021/j150503a017

Cited by 167 publications

(84 citation statements)

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“…Chemical heterogeneities and roughness strengthen the hysteresis of the contact angle (Bartell & Shepard 1953;Dettre & Johnson 1965). Various models explaining the phenomenon of hysteresis have been proposed (Joanny & de Gennes 1984;Nosonovsky 2007a;Vedantam & Panchagnula 2008;Whyman et al 2008).…”

Section: Wetting Statesmentioning

confidence: 99%

Wetting transitions on biomimetic surfaces

Bormashenko

2010

Phil. Trans. R. Soc. A.

126

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Biomimetic hierarchical surfaces demonstrate a potential for a variety of green technologies, including energy conversion and conservation, owing to their remarkable water repellence. The design of such surfaces allowing emerging green applications remains a challenging scientific and technological task. Understanding the physical mechanism of wetting transitions (WTs) is crucial for the design of highly stable superhydrophobic materials. The main experimental and theoretical approaches to WTs are reviewed. Reducing the micro-structural scales is the most efficient measure needed to enlarge the threshold pressure of WTs. The trends of future investigations are envisaged.

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Section: Wetting Statesmentioning

confidence: 99%

Wetting transitions on biomimetic surfaces

Bormashenko

2010

Phil. Trans. R. Soc. A.

126

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“…To facilitate comparison among different materials, Korhonen et al further proposed the term hysteresis percentage, which is defined as (cos θ R − cos θ A )/2 × 100%. However, the use of the factor (θ A − θ R ) in describing the CA hysteresis is still ubiquitous in the literature …”

Section: Definition Of Surface Wettability: Beyond General Classificamentioning

confidence: 99%

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

Kung

Sow

Zahiri

et al. 2019

Adv Materials Inter

131

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www.advmatinterfaces.de the sessile CA remains the favored method for quantifying wettability, mostly due to its conceptual and measurement simplicity. [9,31] However, the classification on the basis of the cut-off CA of 90° has attracted criticism. [32,33] The simplistic evaluation criteria of relative wettability are becoming inadequate in satisfying the needs of superwettability studies to classify different wetting phenomena. [34] Several works have questioned the accuracy of the sessile-droplet measurement as the CA value approaches the limits of 0° or 180°. [35,36] Yet, evaluation of surfaces in the superhydrophobic (CA > 150°) and superhydrophilic (CA < 10°) regimes is central in the development of enhanced wettabilities. Moreover, the interpretation of the CA results is often complicated by several factors, including surface smoothness, heterogeneity and cleanliness. [37] The Chun Haow Kung obtained his B.A.Sc. and M.A.Sc. in Chemical Engineering at the University of British Columbia (UBC). His graduate work with Prof. Mérida's group at UBC focused on the development and application of novel wetting characterization techniques, smart stimuli-responsive materials as well as electrochemical and hydrogen energy systems. He is currently a Research Scientist at Ballard Power Systems Inc. where he continues to pursue his interest in the polymer electrolyte membrane (PEM) fuel cell technology. Beniamin Zahiri is currently a researcher in the University of Illinois at Urbana-Champaign

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“…The control of wetting behavior on solid surfaces has been a constant point of interest to academia and industry for a range of applications since the beginning of the last century . In general, wetting is controlled by the structure and chemistry of a surface, and surfaces that alter their wettability by an external trigger are in high demand.…”

Section: Contact Angle Measurements Of Paper Substrates Coated With Cmentioning

confidence: 99%

Independent Two Way Switching of the Wetting Behavior of Cellulose‐Derived Nanoparticle Surface Coatings by Light and by Temperature

Nau

Seelinger

Biesalski

2019

Adv Materials Inter

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light-triggered changes in the polarity of a material are of interest, as the switching mechanism does not rely on diffusion, as is the case with the pH-or electrolyteinduced switching of polyelectrolytes. [18] However, one of the major challenges of light-responsive spiropyran that has yet to be solved is the rather slow dynamics of the molecular rearrangements (i.e., slow switching behavior) and the oxidative degradation that can occur during the process. Another group of photoresponsive polarity-switching materials are known as donor acceptor Stenhouse adducts (DASAs). DASAs were discovered recently and have gained an increasing amount of attention in a broad range of fields, generating literal toolboxes for the fast implementation into existing systems to add further functionalities. [19][20][21][22][23][24][25][26][27] These compounds are derived from furfural, a commodity chemical and plant by-product, which is a great step toward sustainable building blocks for photoswitchable compounds. Initial studies focusing on the incorporation of the photoresponsive DASA domain into polymer matrices have been carried out, and the products of which displayed a photoinduced change in wetting behavior based around the mechanism displayed in Figure 1a. [28,29] Both studies found that there was no observable back-switching for DASAs on surfaces, which stands in sharp contrast to the fast switching observed for these molecules in solution. A newer study has reported that second-generation DASA-containing polymers could be switched back within hours, triggered by the glass transition of the matrix polymer. [30] Very recently Zheng et al. reported the reversible switching of a silica nanoparticle bound poly dopamine based DASA system, which could, once immobilized on a polydimethylsiloxane substrate, induce a change in water contact angle (WCA) of up to ≈40°. [31] We have been working in the recent past on cellulose-ester and hydroxypropyl cellulose (HPC)-ester polymers, which can be tailored with respect to their thermal behavior (T g ), and such materials can be applied as nanoparticle coatings on planar surfaces. [32,33] When cellulose-or HPC-ester nanoparticles are being coated onto a planar solid or porous (e.g., paper) substrate, superhydrophobic surface properties with WCAs exceeding 150° can be observed through a combination of roughness (a film consisting of nanoparticles) and low surface energy. Through thermal treatment, the nanoparticle structure Recently, donor acceptor Stenhouse adducts (DASAs) have received interest as photoresponsive polarity switches. In this work, a range of DASAs are synthesized and combined with nanoparticles from hydroxypropyl cellulose stearic acid ester to yield a photoresponsive composite material. This composite is spray-coated onto porous paper substrates, forming an interface that is initially superhydrophobic and can be switched by a visible light trigger to become hydrophilic. Subsequently, this hydrophilic state can be switched back to regain a hydrophobic surface by heating abo...

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The Effect of Surface Roughness on Apparent Contact Angles and on Contact Angle Hysteresis. I. The system Paraffin–Water–Air

Cited by 167 publications

References 0 publications

Wetting transitions on biomimetic surfaces

Wetting transitions on biomimetic surfaces

Assessment and Interpretation of Surface Wettability Based on Sessile Droplet Contact Angle Measurement: Challenges and Opportunities

Independent Two Way Switching of the Wetting Behavior of Cellulose‐Derived Nanoparticle Surface Coatings by Light and by Temperature

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