THESIS
2020
xxxiii, 242 pages : illustrations ; 30 cm
Abstract
Self-cleaning materials have achieved significant attention because of their
superhydrophobic/ superhydrophilic features and inclusive range of probable applications in
diverse fields. Although numerous coating products with self-cleaning performance have been
applied in the market, their poor solvent compatibility, insufficient thermal stability and
weakened ultraviolet (UV) resistance continue to pose challenges for maintaining long-lasting
self-cleaning function in practical applications.
In this thesis dissertation, the background of synthesis, properties and multifunctional
applications of superhydrophobic and superhydrophilic self-cleaning materials has been
reviewed. Subsequently, one type of highly transparent hydrophilic organic-inorganic hybrid
nanocoating was synthes...[
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Self-cleaning materials have achieved significant attention because of their
superhydrophobic/ superhydrophilic features and inclusive range of probable applications in
diverse fields. Although numerous coating products with self-cleaning performance have been
applied in the market, their poor solvent compatibility, insufficient thermal stability and
weakened ultraviolet (UV) resistance continue to pose challenges for maintaining long-lasting
self-cleaning function in practical applications.
In this thesis dissertation, the background of synthesis, properties and multifunctional
applications of superhydrophobic and superhydrophilic self-cleaning materials has been
reviewed. Subsequently, one type of highly transparent hydrophilic organic-inorganic hybrid
nanocoating was synthesized for a durable, cost-effective multifunctional self-cleaning
application successfully. Two types of superhydrophobic microcapsules (MCs) including sol-gel treated HDI-MCs and sol-gel treated C
16-IPDI-MCs were also fabricated successfully. Both
of superhydrophobic surfaces with hierarchical structures were generated spontaneously on
these smart MCs via in-situ polymerization and sol-gel surface treatment. The sol-gel treated
HDI-MCs were characterized by various the morphologies, surface roughness and core fraction
were investigated systematically. The superhydrophobic microcapsule-embedded coating
possessed outstanding durability after UV aging and abrasion test. Furthermore, the excellent
property enables the corresponding durable self-cleaning coatings to show high resistance to water-stain mixtures under various harsh attacks from weathering in oppressive reality
surroundings.
In addition, the resultant sol-gel treated C
16-IPDI-MCs not only processed outstanding UV-resistant effect but also it showed superior solvent-proof superhydrophobicity for self-cleaning
applications. The novel MCs were also characterized systematically, presenting excellent
stability in nonpolar and polar aprotic solvent immersion tests (e.g., acetonitrile, acetone). And
more interestingly, these MCs can be used to remove the oil phase from water phase effectively,
realizing a maximum and reusable separation efficiency with > 90% oil removal after 10 cycles
filtration with UV aging. Therefore, these superhydrophobic MCs’ advantages will lead to
effective oil-water separation behaviors, excellent reusability and long-term storage stability in
the promising practical application.
On the other hand, a multifunctional superhydrophilic self-cleaning nanocoating with highly
transparent was developed by organic-inorganic hybrids technology. This organic-inorganic
hybrid nanocoating not only could integrate persistent self-cleaning, anti-fogging, defrosting
properties altogether. Moreover, inorganic silica nanospheres may be considered as a promising
solution to challenges related to the near infrared-reflectance for smart windows. This novel
nanocoating was cost-effective, easily prepared, it possessed outstanding potential to have all
the important properties required for large-scale building applications, such as window, mirror,
cement wall, etc.
Through materials innovation, modifiable superhydrophobic and superhydrophilic surfaces
have been achieved and demonstrated self-cleaning and multifunctional performances.
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