HAL Id: hal-02373050
https://hal.archives-ouvertes.fr/hal-02373050
Submitted on 7 Apr 2020
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Dip-coating with a particulate suspension
Sergio Palma, Henri Lhuissier
To cite this version:
Sergio Palma, Henri Lhuissier. Dip-coating with a particulate suspension. Journal of Fluid Mechanics,
Cambridge University Press (CUP), 2019, 869, �10.1017/jfm.2019.267�. �hal-02373050�
Dip-coating with a particulate suspension
Sergio Palma
1& Henri Lhuissier
1,†
1
Aix Marseille Universit´ e, CNRS, IUSTI, Marseille, France (Received March 27, 2019)
The coating of a plate withdrawn from a bath of a suspension of non-Brownian, mono- disperse and neutrally buoyant spherical particles suspended in a Newtonian liquid has been studied. Using laser profilometry, particle tracking and local sample weighing we have quantified the thickness h and the particle content of the film for varied particle diameters d and volume fractions (0.10 6 φ 6 0.50). Three coating regimes have been observed as the withdrawal velocity is increased: (i) no particle entrainment (h . d), (ii) a monolayer of particles (h ∼ d), and (iii) a thick film (h & d), where the suspension behaves as an effective viscous fluid following the Landau-Levich-Derjaguin law. We discuss the boundaries between these regimes, as well as the evolution of the liquid and solid content of the coating over the whole ranges of withdrawal capillary number and volume fractions.
Key Words: dip-coating, film, surface flow, particulate suspension
1. Introduction
Immersion in a liquid bath (dip-coating) is a simple and efficient coating process, which is widely used across e.g. food, health, textile or plastic industries (Schweizer & Kistler 1997; Weinstein & Ruschak 2004). In its simplest version, a plate withdrawn vertically from the bath with a constant velocity U entrains a uniform liquid film. For a Newtonian liquid with viscosity η
0, density ρ and surface tension σ the film thickness h
0depends on the capillary number Ca = η
0U/σ and length ` = p
σ/ρg, where g is the gravity.
Provided Ca and ρU h
0/η
0are both smaller than 1, it follows
h
0' 0.95`Ca
2/3, (1.1)
as derived by Landau & Levich (1942); Derjaguin (1943) and validated experimentally since then (Morey 1940; van Rossum 1958; Groenveld 1970; Lee & Tallmadge 1974; Kizito et al. 1999; Snoeijer et al. 2008; Maleki et al. 2011).
For a particle-laden liquid, a supplementary length − the particle diameter d − is introduced and different rheology (Guazzelli & Pouliquen 2018) and surface conditions (Kralchevsky & Nagayama 1994) are expected. Motivated by film deposition and self- assembly of colloids for surface patterning, lithography or optical applications (Yu &
Zhang 2013) much attention has been devoted to colloidal particles suspended in a volatile liquid, for which evaporation is often a dominant factor (Dimitrov & Nagayama 1996;
Ghosh et al. 2007; Buchanan et al. 2007; Le Berre et al. 2009; Faustini et al. 2010; Jing et al. 2010; Brewer et al. 2011; Berteloot et al. 2013; Jung & Ahn 2013). However, much fewer studies have considered suspensions of larger particles ( ∼ 100 µm) or low volatility liquids (Kao & Hosoi 2012; Colosqui et al. 2013; Gans et al. 2019). In these cases the
† Email adress for correspondence: henri.lhuissier@univ-amu.fr
2 S. Palma & H. Lhuissier
0 0.1 0.2 0.3 0.4 0.5 0.6
100 101 102 103
(a) (b) (c) (d)
(e)
camera plate
laser g
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wiper
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Front view Side view
precision linear motor U<latexit sha1_base64="NFcS0elJZ6ADCqTHc4ZUCV2/6IE=">AAAB4nicbZDLTgJBEEVr8IX4Ql266UhMXJEZY6JLohuXkDhIAhPS0xTQoeeR7hoTMuEHdGXUnZ/kD/g3NjgLBe/qdN3bSd0KUyUNue6XU1pb39jcKm9Xdnb39g+qh0dtk2RaoC8SlehOyA0qGaNPkhR2Uo08ChU+hJPbuf/wiNrIJL6naYpBxEexHErByY5afr9ac+vuQmwVvAJqUKjZr372BonIIoxJKG5M13NTCnKuSQqFs0ovM5hyMeEj7FqMeYQmyBeLztjZMNGMxsgW79/ZnEfGTKPQZiJOY7PszYf/ed2MhtdBLuM0I4yFjVhvmClGCZv3ZQOpUZCaWuBCS7slE2OuuSB7lYqt7y2XXYX2Rd1z617rsta4KQ5RhhM4hXPw4AoacAdN8EEAwjO8wbszcJ6cF+f1J1pyij/H8EfOxzem/4pu</latexit><latexit sha1_base64="NFcS0elJZ6ADCqTHc4ZUCV2/6IE=">AAAB4nicbZDLTgJBEEVr8IX4Ql266UhMXJEZY6JLohuXkDhIAhPS0xTQoeeR7hoTMuEHdGXUnZ/kD/g3NjgLBe/qdN3bSd0KUyUNue6XU1pb39jcKm9Xdnb39g+qh0dtk2RaoC8SlehOyA0qGaNPkhR2Uo08ChU+hJPbuf/wiNrIJL6naYpBxEexHErByY5afr9ac+vuQmwVvAJqUKjZr372BonIIoxJKG5M13NTCnKuSQqFs0ovM5hyMeEj7FqMeYQmyBeLztjZMNGMxsgW79/ZnEfGTKPQZiJOY7PszYf/ed2MhtdBLuM0I4yFjVhvmClGCZv3ZQOpUZCaWuBCS7slE2OuuSB7lYqt7y2XXYX2Rd1z617rsta4KQ5RhhM4hXPw4AoacAdN8EEAwjO8wbszcJ6cF+f1J1pyij/H8EfOxzem/4pu</latexit><latexit sha1_base64="NFcS0elJZ6ADCqTHc4ZUCV2/6IE=">AAAB4nicbZDLTgJBEEVr8IX4Ql266UhMXJEZY6JLohuXkDhIAhPS0xTQoeeR7hoTMuEHdGXUnZ/kD/g3NjgLBe/qdN3bSd0KUyUNue6XU1pb39jcKm9Xdnb39g+qh0dtk2RaoC8SlehOyA0qGaNPkhR2Uo08ChU+hJPbuf/wiNrIJL6naYpBxEexHErByY5afr9ac+vuQmwVvAJqUKjZr372BonIIoxJKG5M13NTCnKuSQqFs0ovM5hyMeEj7FqMeYQmyBeLztjZMNGMxsgW79/ZnEfGTKPQZiJOY7PszYf/ed2MhtdBLuM0I4yFjVhvmClGCZv3ZQOpUZCaWuBCS7slE2OuuSB7lYqt7y2XXYX2Rd1z617rsta4KQ5RhhM4hXPw4AoacAdN8EEAwjO8wbszcJ6cF+f1J1pyij/H8EfOxzem/4pu</latexit><latexit sha1_base64="NFcS0elJZ6ADCqTHc4ZUCV2/6IE=">AAAB4nicbZDLTgJBEEVr8IX4Ql266UhMXJEZY6JLohuXkDhIAhPS0xTQoeeR7hoTMuEHdGXUnZ/kD/g3NjgLBe/qdN3bSd0KUyUNue6XU1pb39jcKm9Xdnb39g+qh0dtk2RaoC8SlehOyA0qGaNPkhR2Uo08ChU+hJPbuf/wiNrIJL6naYpBxEexHErByY5afr9ac+vuQmwVvAJqUKjZr372BonIIoxJKG5M13NTCnKuSQqFs0ovM5hyMeEj7FqMeYQmyBeLztjZMNGMxsgW79/ZnEfGTKPQZiJOY7PszYf/ed2MhtdBLuM0I4yFjVhvmClGCZv3ZQOpUZCaWuBCS7slE2OuuSB7lYqt7y2XXYX2Rd1z617rsta4KQ5RhhM4hXPw4AoacAdN8EEAwjO8wbszcJ6cF+f1J1pyij/H8EfOxzem/4pu</latexit>
film
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0
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⌘0, ⇢
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max
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e
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(f)
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