3 research outputs found
Surface-Independent Hierarchical Coatings with Superamphiphobic Properties
Facile approaches for the fabrication
of substrate independent superamphiphobic surfaces that can repel
both water and organic liquids have been limited. The design of such
super-repellent surfaces is still a major challenge of surface chemistry
and physics. Herein, we describe a simple and efficient dip-coating
approach for the fabrication of highly hierarchical surface coatings
with superamphiphobic properties for a broad range of materials based
on a mussel-inspired dendritic polymer (MI-dPG). The MI-dPG coating
process provides a precise roughness control, and the construction
of highly hierarchical structures was achieved either directly by
pH-controlled aggregation or in combination with nanoparticles (NP).
Moreover, the fabrication of coatings with a thickness and roughness
gradient was possible via simple adjustment of the depth of the coating
solution. Subsequent postmodification of these highly hierarchical
structures with fluorinated molecules yielded a surface with superamphiphobic
properties that successfully prevented the wetting of liquids with
a low surface tension down to about 30 mN/m. The generated superamphiphobic
coatings exhibit impressive repellency to water, surfactant containing
solutions, and biological liquids, such as human serum, and are flexible
on soft substrates
High-Antifouling Polymer Brush Coatings on Nonpolar Surfaces via Adsorption-Cross-Linking Strategy
A new “adsorption-cross-linking”
technology is presented to generate a highly dense polymer brush coating
on various nonpolar substrates, including the most inert and low-energy
surfaces of polyÂ(dimethylsiloxane) and polyÂ(tetrafluoroethylene).
This prospective surface modification strategy is based on a tailored
bifunctional amphiphilic block copolymer with benzophenone units as
the hydrophobic anchor/chemical cross-linker and terminal azide groups
for in situ postmodification. The resulting polymer brushes exhibited
long-term and ultralow protein adsorption and cell adhesion benefiting
from the high density and high hydration ability of polyglycerol blocks.
The presented antifouling brushes provided a highly stable and robust
bioinert background for biospecific adsorption of desired proteins
and bacteria after secondary modification with bioactive ligands,
e.g., mannose for selective ConA and Escherichia coli binding
Construction of Functional Coatings with Durable and Broad-Spectrum Antibacterial Potential Based on Mussel-Inspired Dendritic Polyglycerol and in Situ-Formed Copper Nanoparticles
A novel
surface coating with durable broad-spectrum antibacterial ability
was prepared based on mussel-inspired dendritic polyglycerol (MI-dPG)
embedded with copper nanoparticles (Cu NPs). The functional surface
coating is fabricated via a facile dip-coating process followed by
in situ reduction of copper ions with a MI-dPG coating to introduce
Cu NPs into the coating matrix. This coating has been demonstrated
to possess efficient long-term antibacterial properties against Escherichia coli (E. coli), Staphylococcus aureus (S. aureus), and kanamycin-resistant E. coli through an “attract–kill–release”
strategy. The synergistic antibacterial activity of the coating was
shown by the combination of two functions of the contact killing,
reactive oxygen species production and Cu ions released from the coating.
Furthermore, this coating inhibited biofilm formation and showed good
compatibility to eukaryotic cells. Thus, this newly developed Cu NP-incorporated
MI-dPG surface coating may find potential application in the design
of antimicrobial coating, such as implantable devices