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Semprebon, Ciro (2009) Wetting on Anisotropically Patterned and Rough Surfaces. [Ph.D. thesis]

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Abstract (english)

Since Young in 1805 described in words the trigonometric relations between the contact
angle and the forces acting on a droplet in mechanical equilibrium on a sulid surface, many advances
in the description of several aspects of wetting behavior have been done. Besides the
recent years developements in the field of micropatterning allowed the production surfaces with
chemical and geometrical regular patterns, which make possible a direct test of theoretical models.
Beyond the patterns characterized by a global isotropic disposition if the surface asperities
and heterogeneities, patterns constituted of series of parallel stripes or reliefs have been produced,
introducing an anisotropic element in the substrate. Recently many works focused on the characterization
of the anisotropic behavior of droplets on those surfaces. However there is not a
complete theory describing the anisotropy of droplets in these conditions. Furthermore most part
of previous works study the anisotropy on regular patterns made by micrometric channels.
To give a general description of those aspects of the anisotropic behavior which are independent
by the nature of the micrometric regular pattern, and to focus on the influence of different
wettabilities, in this thesis we studied the anisotropic wetting of droplets sitting on the top of single
posts, characterized by flat surfaces and sharp corners, and made with different materials. The
anisotropy was quantified by measuring the contact angles and base elongations in the two principal
symmetry axis. Measurements were obtained by a homemade apparatus, and the analysis
software has been entirely developed in this thesis. The main finding is that the contact angle
difference and the base eccentricity show the same relation within the experimental errors
regardless of surface wettability. These measurements were complemented by numerical simulations
with the Lattice Boltzmann method, which showed a good agreement with experimental
results. We also developed a simple geometrical model, valid for small eccentricities which reproduces qualitatively
experimental and numerical data.
In addition, during this thesis I characterized the wetting properties of thin (isotropic) films of
nanostructured titania, and related them to the morphological parameters of the substrates.

Abstract (italian)

Da quando Young nel 1805 descrisse a parole le relazioni trigonometriche tra l’angolo di
contatto e le forze agenti su una goccia in equilibrio meccanico su una superficie solida sono stati
ottenuti molti progressi nella descrizione di vari aspetti del wetting. Inoltre i progressi degli ultimi
anni nel campo della microlavorazione hanno permesso di ottenere in modo semplice superfici
con pattern chimici e geometrici assai regolari, su cui è stato possibile testare sperimentalmente le
ipotesi dei vari modelli teorici. Oltre a tutti i pattern caratterizzati da una disposizione globalmente
isotropa delle asperità, sono stati prodotti pattern costituiti da una serie di strisce e rilievi paralleli
gli uni agli altri, introducendo così un elemento anisotropo nel substrato. Negli ultimi anni molti
lavori sono stati rivolti alla caratterizzazione del comportamento anisotropo delle gocce su tali
substrati. Tuttavia ad oggi non esiste una teoria completa che descriva l’anisotropia di gocce in
queste condizioni. Inoltre la maggior parte dei lavori precedenti riguarda lo studio dell’anisotropia
su pattern regolari costituiti da canali micrometrici.
Per fornire una descrizione generale di quegli aspetti del comportamento anisotropo che sono
indipendenti dai dettagli del pattern regolare su scala micrometrica, e per evidenziare l’influenza di
diverse bagnabilità della superficie, in questa tesi abbiamo studiato il wetting anisotropo di gocce
depositate su singoli rilievi, caratterizzati da una supervicie piana e spigoli vivi, e costruiti con
diversi materiali. L’anisotropia è stata quantificata misurando gli angoli di contatto e le dimensioni
della base delle gocce nei due principali assi di simetria. Le misure sono state ottenute con un
apparato fatto in casa, e il software di analisi è stato interamente sviluppato durante questa tesi. Il
risultato principale consiste nel fatto che la differenza tra gli angoli di contatto nelle due direzioni e l’eccentricità di base mostrano la stessa relazione all’interno degli errori sperimentali,
indipendentemente dalla bagnabilità del substrato. Queste misure sono state completate tramite
simulazioni numeriche per mezzo del metodo Lattice Boltzmann, e che hanno mostrato un buon
accordo con i risultati sperimentali. Inoltre abbiamo formulato un semplice modello geometrico,
valido per piccoli, che riproduce qualitativamente sia i risultati sperimentali che quelli numerici.
Inoltre in questa tesi ho caratterizzato la bagnabilità di sottili film (isotropici) di titania nanostrutturata,
mettendola in relazione con le proprietà morfologiche dei substrati stessi.

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EPrint type:Ph.D. thesis
Tutor:Mistura, Giampaolo
Supervisor:Orlandini, Enzo
Ph.D. course:Ciclo 21 > Scuole per il 21simo ciclo > FISICA
Data di deposito della tesi:28 January 2009
Anno di Pubblicazione:28 January 2009
Key Words:anisotropy, wetting, contact angle, lattice Boltzmann,
Settori scientifico-disciplinari MIUR:Area 02 - Scienze fisiche > FIS/03 Fisica della materia
Struttura di riferimento:Dipartimenti > Dipartimento di Fisica e Astronomia "Galileo Galilei"
Codice ID:1548
Depositato il:28 Jan 2009
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Bibliografia

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