UV-induced switching behavior of novel fluoroalkyl end-capped vinyltrimethoxysilane oligomer/titanium oxide nanocomposite between superhydrophobicity and superhydrophilicity with good oleophobicity

The superhydrophobicity of polymer surfaces: Recent developments

“…133 Polymers that can change contact angle can be used to switch superhydrophobic surfaces from one state to another simply by roughening them in some manner; particularly if they can be switched around 90 as the contact angle is magnified the most in this region by roughening the surface. The switching can be carried out chemically, by having a rearrangement in the polymer, in the simplest case a switching from a conductive to a nonconductive state, for example, polypyrrole 134 but also by using thermal, 135 pH 136 (poly(Nisopropylacrylamide for both thermal and pH), and poly(dimethylamino)ethyl methacrylate (PDMAEMA) became protonated and switched configuration on exposure to acid) and light (in the form of photoreactive inorganic-organic hybrids 137 and conformational changes as in spyropyrans 138 ). Other examples include ionisation of a carboxylic or amine ligand on an inorganic particle, 139 using poly 2-(dipropylamino)ethyl methacrylate (PDPAEMA), brushes, and switching with a gas.…”

Preparation and photocatalytic activity of fluoroalkyl end-capped vinyltrimethoxysilane oligomer/anatase titanium oxide nanocomposite-encapsulated low molecular weight aromatic compounds

“…Therefore, from the developmental viewpoint of organic polymer/titanium oxide nanocomposites having a good dispersibility and stability in a variety of solvents, it is of particular interest to use fluorinated polymers possessing a high surface active characteristic for the preparation of these titanium oxide nanocomposites [8]. In fact, we have already succeeded in preparing fluoroalkyl end-capped vinyltrimethoxysilane oligomer/anatase titanium oxide nanocomposites [R F -(VM-SiO 2 ) n -R F /an-TiO 2 ] by the sol-gel reaction of the corresponding oligomer [R F -(VM) n -R F ] in the presence of anatase titanium oxide nanoparticles (an-TiO 2 ) under alkaline conditions [9].…”

Controlling photochromism between fluoroalkyl end-capped oligomer/polyaniline and N,N′-diphenyl-1,4-phenylenediamine nanocomposites induced by UV-light-responsive titanium oxide nanoparticles

“…In these fluorinated nanocomposites, especially, fluorinated oligomers/titanium oxide nanocomposites have been recently applied to the surface modification of glass to exhibit not only a completely superhydrophobic characteristic with a non-wetting property against water droplets but also a good oleophobicity imparted by fluoroalkyl segments in the composites on their surface [14]. Especially, the wettability for water on the modified surface can be switched between superhydrophobicity and superhydrophilicity by alternation of UV (ultraviolet) irradiation and dark storage with keeping a good oleophobicity on the modified surface treated with the fluorinated anatase-type titanium oxide nanocomposites [14]. Therefore, it is in particular interest to develop novel fluoroalkyl end-capped oligomers/PAn/titanium oxide nanoparticle composites, because these fluorinated composites have high potential applications imparted by not only fluorine but also PAn or titanium oxide toward a variety of areas such as conductive coating, charge storage, electrocatalyst, electrochromic devices, and photovoltaic cells [15][16][17][18].…”

“…Hitherto, we have been comprehensively studying on the development of fluoroalkyl end-capped oligomers/metal nanoparticle composites possessing not only a good surface active characteristic imparted by fluorine but also a good dispersibility and stability in a variety of solvents [12,13]. In these fluorinated nanocomposites, especially, fluorinated oligomers/titanium oxide nanocomposites have been recently applied to the surface modification of glass to exhibit not only a completely superhydrophobic characteristic with a non-wetting property against water droplets but also a good oleophobicity imparted by fluoroalkyl segments in the composites on their surface [14]. Especially, the wettability for water on the modified surface can be switched between superhydrophobicity and superhydrophilicity by alternation of UV (ultraviolet) irradiation and dark storage with keeping a good oleophobicity on the modified surface treated with the fluorinated anatase-type titanium oxide nanocomposites [14].…”