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Rossegger E, Nees D, Turisser S, Radl S, Griesser T, Schlögl S. Photo-switching of surface wettability on micropatterned photopolymers for fast transport of water droplets over a long-distance. Polym Chem 2020. [DOI: 10.1039/d0py00263a] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Long distance movement (>20 mm) of water droplets across thiol–acrylate photopolymers with inscribed wettability and Laplace pressure gradient is demonstrated.
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Affiliation(s)
- E. Rossegger
- Polymer Competence Center Leoben GmbH
- A-8700 Leoben
- Austria
| | - D. Nees
- Joanneum Research GmbH
- A-8160 Weiz
- Austria
| | - S. Turisser
- Polymer Competence Center Leoben GmbH
- A-8700 Leoben
- Austria
| | - S. Radl
- Polymer Competence Center Leoben GmbH
- A-8700 Leoben
- Austria
| | - T. Griesser
- Institute of Chemistry of Polymeric Materials
- Montanuniversitaet Leoben
- A-8700 Leoben
- Austria
| | - S. Schlögl
- Polymer Competence Center Leoben GmbH
- A-8700 Leoben
- Austria
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Ding Y, Jia L, Peng Q, Guo J. Critical sliding angle of water droplet on parallel hydrophobic grooved surface. Colloids Surf A Physicochem Eng Asp 2020; 585:124083. [DOI: 10.1016/j.colsurfa.2019.124083] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Erfani Gahrooei HR, Ghazanfari MH. Toward a hydrocarbon-based chemical for wettability alteration of reservoir rocks to gas wetting condition: Implications to gas condensate reservoirs. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.10.043] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Erfani Gahrooei HR, Ghazanfari MH, Karimi Malekabadi F. Wettability alteration of reservoir rocks to gas wetting condition: A comparative study. CAN J CHEM ENG 2017. [DOI: 10.1002/cjce.23023] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Affandi MMM, Tripathy M, Majeed A. Solubility enhancement of simvastatin and atorvastatin by arginine: Contact angle determination, wettability and surface energy characteristics. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.05.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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7
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Ataei M, Tang T, Amirfazli A. Motion of a liquid bridge between nonparallel surfaces. J Colloid Interface Sci 2017; 492:218-28. [DOI: 10.1016/j.jcis.2016.11.093] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2016] [Revised: 11/25/2016] [Accepted: 11/25/2016] [Indexed: 11/17/2022]
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Ataei M, Chen H, Tang T, Amirfazli A. Stability of a liquid bridge between nonparallel hydrophilic surfaces. J Colloid Interface Sci 2017; 492:207-217. [DOI: 10.1016/j.jcis.2016.11.092] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 11/25/2016] [Accepted: 11/25/2016] [Indexed: 11/16/2022]
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Affiliation(s)
- Takashi Nishiyama
- Department of Aeronautics and Astronautics; Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
| | - Koji Takahashi
- Department of Aeronautics and Astronautics; Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
| | - Tatsuya Ikuta
- Department of Aeronautics and Astronautics; Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
| | - Yutaka Yamada
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
| | - Yasuyuki Takata
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER); Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
- Department of Mechanical Engineering; Kyushu University; 744 Motooka, Nishi-ku Fukuoka Japan
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Chen H, Tang T, Zhao H, Law KY, Amirfazli A. How pinning and contact angle hysteresis govern quasi-static liquid drop transfer. Soft Matter 2016; 12:1998-2008. [PMID: 26777599 DOI: 10.1039/c5sm02451j] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This paper presents both experimental and numerical simulations of liquid transfer between two solid surfaces with contact angle hysteresis (CAH). Systematic studies on the role of the advancing contact angle (θa), receding contact angle (θr) and CAH in determining the transfer ratio (volume of the liquid transferred onto the acceptor surface over the total liquid volume) and the maximum adhesion force (Fmax) were performed. The transfer ratio was found to be governed by contact line pinning at the end of the transfer process caused by CAH of surfaces. A map based on θr of the two surfaces was generated to identify the three regimes for liquid transfer: (I) contact line pinning occurs only on the donor surface, (II) contact line pinning occurs on both surfaces, and (III) contact line pinning occurs only on the acceptor surface. With this map, an empirical equation is provided which is able to estimate the transfer ratio by only knowing θr of the two surfaces. The value of Fmax is found to be strongly influenced by the contact line pinning in the early stretching stage. For symmetric liquid bridges between two identical surfaces, Fmax may be determined only by θa, only by θr, or by both θa and θr, depending on the magnitude of the contact angles. For asymmetric bridges, Fmax is found to be affected by the period when contact lines are pinned on both surfaces.
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Affiliation(s)
- H Chen
- Department of Mechanical Engineering, York University, Toronto, ON M3J 1P3, Canada.
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Abstract
In this work, a systematic experimental study was performed to understand the fast liquid transfer process between two surfaces. According to the value of the Reynolds number (Re), the fast transfer is divided into two different scenarios, one with negligible inertia effects (Re ≪ 1) and the other with significant inertia effects (Re > 1). For Re ≪ 1, the influences of the capillary number (Ca) and the dimensionless minimum separation (H(min)* = H(min)/V(1/3), where H(min) is the minimum separation between two surfaces and V is the volume of liquid) on the transfer ratio (α, the volume of liquid transferred to the acceptor surface over the total liquid volume) are discussed. On the basis of the roles of each physical parameter, an empirical equation is presented to predict the transfer ratio, α = f(Ca). This equation involves two coefficients which are affected only by the surface contact angles and H(min)* but not by the liquid viscosity or surface tension. When Re > 1, it is shown for the first time that the transfer ratio does not converge to 0.5 with the increase in the stretching speed.
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Affiliation(s)
- H Chen
- Department of Mechanical Engineering, University of Alberta , Edmonton, AB T6G 2G8, Canada
| | - T Tang
- Department of Mechanical Engineering, University of Alberta , Edmonton, AB T6G 2G8, Canada
| | - A Amirfazli
- Department of Mechanical Engineering, York University , Toronto, ON M3J 1P3, Canada
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Noguera-Marín D, Moraila-Martínez CL, Cabrerizo-Vílchez MA, Rodríguez-Valverde MA. Particle Segregation at Contact Lines of Evaporating Colloidal Drops: Influence of the Substrate Wettability and Particle Charge-Mass Ratio. Langmuir 2015; 31:6632-6638. [PMID: 26000909 DOI: 10.1021/acs.langmuir.5b01062] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Segregation of particles during capillary/convective self-assembly is interesting for self-stratification in colloidal deposits. In evaporating drops containing colloidal particles, the wettability properties of substrate and the sedimentation of particles can affect their accumulation at contact lines. In this work we studied the size segregation and discrimination of charged particles with different densities. We performed in-plane particle counting at evaporating triple lines by using fluorescence confocal microscopy. We studied separately substrates with very different wettability properties and particles with different charge-mass ratios at low ionic strength. We used binary colloidal suspensions to compare simultaneously the deposition of two different particles. The particle deposition rate strongly depends on the receding contact angle of the substrate. We further observed a singular behavior of charged polystyrene particles in binary mixtures under "salt-free" conditions explained by the "colloidal Brazil nut" effect.
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Affiliation(s)
- Diego Noguera-Marín
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, E-18071 Granada, Spain
| | - Carmen L Moraila-Martínez
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, E-18071 Granada, Spain
| | - Miguel A Cabrerizo-Vílchez
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, E-18071 Granada, Spain
| | - Miguel A Rodríguez-Valverde
- Biocolloid and Fluid Physics Group, Applied Physics Department, Faculty of Sciences, University of Granada, E-18071 Granada, Spain
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Abstract
The transfer ratio of quasi-static liquid transfer was found to strongly depend on the difference between the receding contact angles of the two surfaces. In contrast to traditional thinking, the transfer ratio was quite insensitive to the adhesion force between the solid and the liquid when the liquid bridge broke.
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Affiliation(s)
- H Chen
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 2G8, Canada.
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Antonini C, Villa F, Bernagozzi I, Amirfazli A, Marengo M. Drop rebound after impact: the role of the receding contact angle. Langmuir 2013; 29:16045-16050. [PMID: 24028086 DOI: 10.1021/la4012372] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Data from the literature suggest that the rebound of a drop from a surface can be achieved when the wettability is low, i.e., when contact angles, measured at the triple line (solid-liquid-air), are high. However, no clear criterion exists to predict when a drop will rebound from a surface and which is the key wetting parameter to govern drop rebound (e.g., the "equilibrium" contact angle, θeq, the advancing and the receding contact angles, θA and θR, respectively, the contact angle hysteresis, Δθ, or any combination of these parameters). To clarify the conditions for drop rebound, we conducted experimental tests on different dry solid surfaces with variable wettability, from hydrophobic to superhydrophobic surfaces, with advancing contact angles 108° < θA < 169° and receding contact angles 89° < θR < 161°. It was found that the receding contact angle is the key wetting parameter that influences drop rebound, along with surface hydrophobicity: for the investigated impact conditions (drop diameter 2.4 < D0 < 2.6 mm, impact speed 0.8 < V < 4.1 m/s, Weber number 25 < We < 585), rebound was observed only on surfaces with receding contact angles higher than 100°. Also, the drop rebound time decreased by increasing the receding contact angle. It was also shown that in general care must be taken when using statically defined wetting parameters (such as advancing and receding contact angles) to predict the dynamic behavior of a liquid on a solid surface because the dynamics of the phenomenon may affect surface wetting close to the impact point (e.g., as a result of the transition from the Cassie-Baxter to Wenzel state in the case of the so-called superhydrophobic surfaces) and thus affect the drop rebound.
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Affiliation(s)
- C Antonini
- Department of Engineering, University of Bergamo , Viale Marconi 5, 24044 Dalmine (BG), Italy
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Mahieu A, Terrié C, Agoulon A, Leblanc N, Youssef B. Thermoplastic starch and poly(ε-caprolactone) blends: morphology and mechanical properties as a function of relative humidity. J Polym Res 2013; 20. [DOI: 10.1007/s10965-013-0229-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Abstract
This paper presents the behaviors of a liquid bridge when being compressed and stretched in a quasi-static fashion between two solid surfaces that have contact angle hysteresis (CAH). A theoretical model is developed to obtain the profiles of the liquid bridge given a specific separation between the surfaces. Different from previous models, both contact lines in the upper and lower surfaces were allowed to move when the contact angles reach their advancing or receding values. When the contact angles are between their advancing and receding values, the contact lines are pinned while the contact angles adjust to accommodate the changes in separation. Effects of CAH on both asymmetric and symmetric liquid bridges were analyzed. The model was shown to be able to correctly predict the behavior of the liquid bridge during a quasi-static compression/stretching loading cycle in experiments. Because of CAH, the liquid bridge can have two different profiles at the same separation during one loading and unloading cycle, and more profiles can be obtained during multiple cycles. The maximum adhesion force generated by the liquid bridge is found to be influenced by the CAH of surfaces. CAH also leads to energy cost during a loading cycle of the liquid bridge. In addition, the minimum separation between the two solid surfaces is shown to affect how the contact radii and angles change on the two surfaces as the liquid bridge is stretched.
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Affiliation(s)
- H Chen
- Department of Mechanical Engineering, University of Alberta, Edmonton, AB, Canada
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