UV-curable nanocasting technique to prepare bioinspired superhydrophobic organic-inorganic composite anticorrosion coatings

Abstract

Corrosion is the deterioration of materials by chemical interaction with their environment. The consequences of corrosion are many and varied; corrosion's effects on the safe, reliable, and efficient operation of equipment or structures are often more serious than the simple loss of a metal mass. Abstract. A UV-curing technique was used to develop advanced anticorrosive coatings made of a poly(methyl methacrylate) (PMMA)/silica composite (PSC) with bioinspired Xanthosoma sagittifolium leaf-like superhydrophobic surfaces. First of all, a transparent soft template with negative patterns of xanthosoma sagittifolium leaf can be fabricated by thermally curing the polydimethylsiloxane (PDMS) pre-polymer in molds at 60°C for 4 h, followed by detaching PDMS template from the surface of natural leaf. PSC coatings with biomimetic structures can be prepared by performing the UV-radiation process upon casting UV-curable precursor with photo-initiator onto cold-rolled steel (CRS) electrode under PDMS template. Subsequently, UV-radiation process was carried out by using light source with light intensity of 100 mW/cm 2 with exposing wavelength of 365 nm. Surface morphologies of the as-synthesized hydrophobic PMMA (HP) and superhydrophobic PSC (SPSC) coatings showed a large number of micro-scaled mastoids, each decorated with many nano-scaled wrinkles that were systematically investigated by using scanning electron microscopy (SEM). The contact angles of water droplets on the sample surfaces can be increased from ~81 and 103° on PMMA and PSC surfaces to ~148 and 163° on HP and SPSC surfaces, respectively. The SPSC coating was found to provide an advanced corrosion protection effect on CRS electrodes compared to that of neat PMMA, PSC, and HP coatings based on a series of electrochemical corrosion measurements in 3.5 wt% NaCl electrolyte. Enhanced corrosion protection of SPSC coatings on CRS electrodes can be illustrated by that the silica nanoparticles on the small papillary hills of the bioinspired structure of the surface further increased the surface roughness, making the surface exhibit superior superhydrophobic, and thus leading to much better anticorrosion performance.

A study on the properties and working mechanism of a waterborne polyurethane-modified silicate-based coating

“…However, organic-inorganic composites with excellent properties could be obtained by mixing organic and inorganic materials. [18][19][20][21][22][23] Koester anti-corrosive coatings in Germany are a kind of special mortar with strong acid resistance based on polymers and silicate, which have high compressive strength, exibility, acid resistance and bending resistance. The purpose of the addition of organic components was to improve the physical and mechanical properties, such as adhesion, impact resistance and exibility, of the coatings.…”

Fabrication of hierarchically structured superhydrophobic PDMS surfaces by Cu and CuO casting

“…Among its attractive attributes, it is inexpensive, stretchable [2], transparent [3], bio-compatible [4], and exhibits high chemical [5] and electrical resistance [6]. Recently, superhydrophobic PDMS surfaces have been developed to serve as low-drag fluidic channels [7], anti-corrosion coatings [8], and self-cleaning solar cell module coverings [9]. A superhydrophobic surface exhibits very high water contact angle (Â > 150 • ) and very low contact angle hysteresis ( Â < 10 • ) [10], indicating low adhesion between water and the surface.…”

Development of novel antibacterial active, HaCaT biocompatible and biodegradable CA-g-P(3HB)-EC biocomposites with caffeic acid as a functional entity

“…From the last few years, antimicrobial finishing of medical materials has become extremely important in the production of protective, biocompatible, biodegradable, non-toxic products with respect to the health and safety. This has provided opportunities to expand the use of biomaterials to different applications in the pharmaceutical, medical, tissue engineering, agricultural, and food industries [4][5][6][7]. Most phenols like caffeic acid, as natural auxiliaries host antimicrobial activity and can also be grafted to improve or impart existing or antimicrobial properties, respectively.…”

“…In recent years, a great interest has grown in the development of polymeric materials or composites with multifunctional characteristics, such as antibacterial, anticorrosive, biocompatible and biodegradable, to explore their potential for wider use in a variety of applications e.g. biomedical, pharmaceutical, drug delivery, food packaging, sanitary materials, household, energy and military items [2,[4][5][6][7][8]. In our previous work, novel enzyme-based composites by grafting poly (3- [2,4,7].…”