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Home  > Raw materials & technologies  > Technologies  > Functional coatings  > Surface-modified nanoparticles endow coati...

Wednesday, 18 September 2019
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Raw materials & technologies, Technologies, Functional coatings

Surface-modified nanoparticles endow coatings with combined properties

Friday, 27 March 2015

Nanoparticles are specifically adapted to the particular application by Small Molecule Surface Modification (SMSM).

SMSM bestows specific combinations of desired properties, for example hydrophilic, hydrophobic, adhesive or anti-adhesive. Source: mattilda/Fotolia

SMSM bestows specific combinations of desired properties, for example hydrophilic, hydrophobic, adhesive or anti-adhesive. Source: mattilda/Fotolia

Thereby surfaces of workpieces or mouldings are expected to exhibit several different functions at one and the same time.

Designing multifunctional coatings

Fabricators and processors alike demand consistently high quality for their intermediate and final products. The properties of these goods usually also have to meet specific requirements. Particularly the surfaces of workpieces or mouldings are expected to exhibit several different functions at one and the same time, depending on the industry. Robustness, unchanging appearance, mar resistance, impact resistance or UV stability may be required, for instance. The INM – Leibniz Institute for New Materials uses nanoparticles as design element for such multifunctional coatings. These nanoparticles are specifically adapted to the particular application by SMSM.

SMSM bestows desired properties

Depending on which property is desired, the nanoparticles used can be surface modified with organic moieties. SMSM bestows specific combinations of desired properties, for example hydrophilic, hydrophobic, adhesive, anti-adhesive, acidic, basic, inert or polymerisable. Nanoparticles thus modified are used to develop nanocomposites: they combine the physical solid-state properties of e.g. ceramics or semiconductors with classic polymer-processing technology. Titanium dioxide, barium titanate, indium-tin oxide or zirconium dioxide, for instance, are used as nanoparticles. In addition to the chemical intrinsic composition of the nanoparticles and their SMSM surface treatment, the properties that are attainable for the desired coatings also vary with the size and dispersal mode of the nanoparticles.

Produced via wet-chemical processes

INM’s composite systems are produced via wet-chemical processes. The modified nanoparticles and additives combine with a polymer matrix (an epoxy resin, an acrylate, a polyimide for example) or a hybrid matrix (organic-inorganic) to produce a coatable "Nanomer” composite system. "The modular principle makes it possible to achieve a number of properties at one and the same time in one material,” explains Carsten Becker-Willinger, head of the program division Nanomers, "it helps us to respond in a highly systematic way to the different needs of industry,” the chemist summarises the potential of nanocomposite technology.

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