A5024971344- Marine Biology and Environmental Chemistry
- Polymer Surface Interaction Studies
- Microplastics and Plastic Pollution
- Marine Ecology and Invasive Species
- Marine Biology and Ecology Research
- Environmental Toxicology and Ecotoxicology
- Antimicrobial agents and applications
- Coral and Marine Ecosystems Studies
- Aquatic Invertebrate Ecology and Behavior
- Marine and coastal plant biology
- Marine Toxins and Detection Methods
- Marine Sponges and Natural Products
- Marine Bivalve and Aquaculture Studies
- Environmental Chemistry and Analysis
- Marine and coastal ecosystems
- Recycling and utilization of industrial and municipal waste in materials production
- Molecular Junctions and Nanostructures
- Concrete and Cement Materials Research
- Corrosion Behavior and Inhibition
- Nanoparticles: synthesis and applications
- Coal and Its By-products
- Echinoderm biology and ecology
- Plant Diversity and Evolution
- Synthetic Organic Chemistry Methods
- Force Microscopy Techniques and Applications
National University of Singapore
2015-2024
National Parks Board
2012
Chinese University of Hong Kong
2000
Bioscience (China)
1999
Swansea University
1994-1995
University of Wales
1994-1995
Giant clams (Hippopus and Tridacna species) are thought to play various ecological roles in coral reef ecosystems, but most of these have not previously been quantified. Using data from the literature our own studies we elucidate functions giant clams. We show how their tissues food for a wide array predators scavengers, while discharges live zooxanthellae, faeces, gametes eaten by opportunistic feeders. The shells provide substrate colonization epibionts, commensal ectoparasitic organisms...
Barnacle cement (BC) was beneficially applied on stainless steel (SS) to serve as the initiator anchor for surface-initiated polymerization. The amine and hydroxyl moieties of barnacle reacted with 2-bromoisobutyryl bromide provide alkyl halide atom transfer radical polymerization (ATRP) 2-hydroxyethyl methacrylate (HEMA). groups HEMA polymer (PHEMA) were then converted carboxyl coupling chitosan (CS) impart SS surface both antifouling antibacterial properties. surface-functionalized reduced...
The effect of incorporation silicone oils into a siloxane-polyurethane fouling-release coatings system was explored. Incorporation phenylmethyl oil has been shown to improve the performance silicone-based through increased interfacial slippage. extent improvement is highly dependent upon type and composition used. (SiPU) coating tough solution, which combines mechanical durability polyurethane while maintaining comparable with regard commercial standards. To further siloxane-PU system, use...
Inspired by tea stains, plant polyphenolic tannic acid (TA) was beneficially employed as the primer anchor for functional polymer brushes. The brominated TA (TABr) initiator synthesized partial modification of with alkyl bromide functionalities. TABr trihydroxyphenyl moieties can readily on a wide range substrates, including metal, metal oxide, polymer, glass, and silicon. Concomitantly, terminals serve initiation sites atom transfer radical polymerization (ATRP). Cationic...
When synthetic materials are submerged in marine environments, dissolved matter and organisms attach to their surfaces by a process known as fouling. This phenomenon may lead diminished material performance with detrimental consequences. Bioinspired surface patterning chemical modifications present promising approaches the design of novel functional that can prevent biofouling phenomena. In this study, we report synergistic effects patterns, inspired decapod crab Myomenippe hardwickii...
We report on a molecular fabrication approach to precisely control surface ζ potentials of polymeric thin layers constructed by electrostatic layer-by-layer (LbL) assembly methods. The protocol established allows us achieve isoelectric points (IEP) in the pH range 6–10. Poly(acrylic acid) (PAA, weak polyanion) and poly(diallyldimethylammonium chloride) (PDADMAC, strong polycation) were chosen build up bulk films. polycation polyethylenimine (PEI) was applied as top layer. A unique feature...
Barnacle cement (BC) was utilized 'beneficially' as a surface anchor on stainless steel (SS) for coupling of functional polymer brushes via "click" reactions in both "grafting-to" and "grafting-from" processes. Ethylene sulfide (ES), propargyl carbonylimidazole (PPC) azidoethyl (AEC) reacted with amine and/or hydroxyl groups BC to introduce the corresponding thiol, alkyne, azide SS surfaces (SS-thiol, SS-alkyne, SS-azide, respectively). Antifouling zwitterionic SS-PMPC prepared by thiol-ene...
The exposure of nanoplastics was investigated by observing their interaction with Amphibalanus amphitrite (commonly known as acorn barnacles). Poly(methyl methacrylate) (PMMA) and fluorescent perylene tetraester (PTE) dye were used to prepare highly nanoplastic particles. At concentrations 25 ppm, the PMMA particles showed no detrimental impact on barnacle larvae microalgae feed, Tetraselmis suecica Chaetoceros muelleri. ingested translocated inside body nauplii within first 3 h incubation....
"Click" chemistry-enabled layer-by-layer (LBL) deposition of multilayer functional polymer coatings provides an alternative approach to combating biofouling. Fouling-resistant azido-functionalized poly(ethylene glycol) methyl ether methacrylate-based chains (azido-poly(PEGMA)) and antimicrobial alkynyl-functionalized 2-(methacryloyloxy)ethyl trimethyl ammonium chloride-based (alkynyl-poly(META)) were click-assembled via alkyne-azide 1,3-dipolar cycloaddition. The are resistant bacterial...
Hyperbranched polyethyleneimine (BPEI) was coupled to a polydopamine-coated stainless steel (SS) substrate. Subsequent mercaptoethylation of BPEI with ethylene sulfide produced thiol functional groups on the SS surface. Functionalization surface achieved by end-capping hyperbranches organic molecules via thiol-based chemistry, including thiol–epoxy coupling, thiol–ene radical photo-addition and thiol–Michael addition. The SS-P(HEMA-b-SBMA) prepared an alkene-functionalized...
A polyionic multilayer film was fabricated by layer-by-layer (LbL) sequential deposition followed cross-linking under mild conditions on a substrate surface to inhibit marine fouling. novel polyanion, featuring methyl ester groups for an easy used as generic solution stabilization of LbL films in harsh environment. Covalent confirmed FTIR and XPS spectroscopy. AFM observe morphology its variation because cross-linking, well measure the thickness films. Cross-linking improved stability when...
Versatile antifouling coatings from catechol and zwitterion-bifunctionalized poly(ethylene glycol).
Surface biofouling has been a serious environmental and ecological problem for centuries. In this study, pH-sensitive poly(2-diisopropylaminoethyl methacrylate)-b-poly(2-methacryloyloxyethyl phosphorylcholine) (PDPA-b-PMPC) cationic polylysine (PLYS) chains are grafted on tannic acid (TA). The resulting PLYS-TA-PDPA-b-PMPC can be anchored in "one-step", via coordination chelation of TA, substrate surfaces to impart the latter with switchable antimicrobial antifouling functionalities....
The hypothesis that pharmaceuticals, with their known syntheses, chemical properties and primary mechanism of action would be an efficient source new antifouling agents compatible existing coating technology was tested. Twenty-three compounds at concentrations from 5 w g ml m 1 to 40 ng were tested for toxicity inhibition settlement barnacle larvae. had a wide range solubility in water covered nine mechanisms vertebrates. upper level potency chosen because are highly potent have greater...
Dense and uniform polymer brush coatings were developed to combat marine biofouling. Nonionic hydrophilic, nonionic hydrophobic, cationic, anionic zwitterionic synthesized via surface-initiated atom transfer radical polymerization (SI-ATRP) of 2-hydroxyethyl methacrylate, 2,3,4,5,6-pentafluorostyrene, 2-(methacryloyloxy)ethyl trimethylammonium chloride, 4-styrenesulfonic acid sodium N,N′-dimethyl-(methylmethacryloyl ethyl) ammonium propanesulfonate, respectively. The functionalized surfaces...
We report on the marine fouling and release effects caused by variations of surface mechanical properties microtopography engineering polymers. Polymeric materials were covered with hierarchical micromolded topographical patterns inspired shell decapod crab Myomenippe hardwickii. These micropatterned surfaces deployed in field static immersion tests. PDMS, polyurethane, PMMA higher elastic modulus hardness found to accumulate more exhibited poor properties. The results indicate interplay...
For many decades, silicone elastomers with oil incorporated have served as fouling-release coating for marine applications. In a comprehensive study involving series of laboratory-based fouling assays and extensive global field studies up to 2-year duration, we compare polydimethylsiloxane (PDMS) coatings the same composition loaded via two different methods. One method used traditional, one-pot pre-cure addition approach (o-PDMS) another newer post-cure infusion (i-PDMS). The latter...