ORCID Profile
0000-0001-6764-4749
Current Organisation
Swinburne University of Technology
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Civil Engineering | Manufacturing robotics | Distributed systems and algorithms | Cyberphysical systems and internet of things | Construction Materials | Distributed computing and systems software
ANZSRC Socio-Economic Objective (SEO)
Expanding Knowledge in Engineering | Cement and Concrete Materials |
Related Links
Publications
Plasma protein adsorption and thrombus formation on surface functionalized polypyrrole with and without electrical stimulation
Publisher: Elsevier BV
Date: 07-2004
Covalent Immobilization of Glucose Oxidase on Well-Defined Poly(glycidyl methacrylate)−Si(111) Hybrids from Surface-Initiated Atom-Transfer Radical Polymerization
Publisher: American Chemical Society (ACS)
Date: 08-01-2005
DOI: 10.1021/BM0493178
Abstract: A simple one-step procedure was employed for the covalent immobilization of an atom-transfer radical polymerization (ATRP) initiator, via the robust Si-C bond, on the hydrogen-terminated Si(111) surface (Si-H surface). Well-defined poly(glycidyl methacrylate) [P(GMA)] brushes, tethered directly on the (111)-oriented single-crystal silicon surface, were prepared via surface-initiated ATRP. Kinetics study on the surface-initiated ATRP of glycidyl methacrylate revealed that the chain growth from the silicon surface was consistent with a "controlled" process. A relatively high concentration of glucose oxidase (GOD above 0.2 mg/cm2) could be coupled directly to the well-defined P(GMA) brushes via the ring-opening reaction of the epoxide groups with the amine moieties of the enzyme. The resultant GOD-functionalized P(GMA) brushes, with the accompanying hydroxyl groups from the ring-opening reaction of the epoxide groups, serves as an effective spacer to provide the GOD with a higher degree of conformational freedom and a more hydrophilic environment. An equivalent enzyme activity above 1.6 units/cm2 [micromoles of beta-D-(+)-glucose oxidized to d-gluconolactone per minute per square centimeter] and a corresponding relative activity of about 60% could be readily achieved. The immobilized GOD also exhibited an improved stability during storage over that of the free enzyme. The GOD-functionalized silicon substrates are potentially useful to the development of silicon-based glucose biosensors.
Assessment of in Vitro Bioactivity of Hyaluronic Acid and Sulfated Hyaluronic Acid Functionalized Electroactive Polymer
Publisher: American Chemical Society (ACS)
Date: 24-08-2004
DOI: 10.1021/BM040048V
Abstract: Electrically conductive polypyrrole (PPY) was surface functionalized with hyaluronic acid (HA) and sulfated hyaluronic acid (SHA) to improve its surface biocompatibility. The immobilization of HA on the PPY film was facilitated by the use of a cross-linker having the appropriate functional groups. The biological activity of the HA functionalized PPY film was assessed by means of an in vitro PC12 cell culture. The cell attachment on different substrates was studied and determined by bicinchoninic acid protein analysis. Cell attachment on the HA functionalized PPY film surface was significantly enhanced in the presence of nerve growth factor. The SHA functionalized PPY film was obtained by the sulfonation of the immobilized HA using pyridinesulfonate. The retention of the biological activity of the immobilized HA after sulfonation was evaluated by the in vitro assessment of the plasma recalcification time (PRT) and platelet adhesion on the substrate. The PRT observed from the SHA functionalized PPY film was significantly prolonged compared with the HA functionalized PPY. Some reduction of platelet adhesion was observed for the SHA functionalized PPY film, compared with that of the HA functionalized PPY film.
Removal of Clostridium perfringens, Escherichia coli and F-RNA coliphages by stormwater biofilters
Publisher: Elsevier BV
Date: 12-2012
Effect of Paste Fluidity and Paste-to-Aggregate Ratio on the Strength and Permeability of Porous Mortar from Manufactured Sand
Publisher: MDPI AG
Date: 19-12-2022
DOI: 10.3390/MA15249065
Abstract: Many places in the world suffer from a shortage of river sand because of population growth and environmental protection, and people have to replace river sand with manufactured sand (M-sand). In this study, M-sand was adopted as aggregate and the effect of the mix design (paste fluidity (PF) and paste-to-aggregate ratio (P/A)) on the properties of porous mortar was investigated through a combined experimental, statistical and response surface method (RSM). By including variations in both P/A (0.16–0.26) and PF (160–200 mm), the method was utilized to develop ANOVA models and construct response surface and contour lines. The experimental results revealed that the compressive strength of the porous mortar increased by 62.3% to a value of 34.1 MPa while the PF increased to 190 mm from 160 mm at a P/A of 0.20, and the water permeability coefficient was 7.2 mm/s under the same conditions. In addition, the ANOVA analysis of the measured properties revealed a strong interactive effect of the paste-to-aggregate ratio and paste fluidity on the porous mortar properties, and the developed relationship models between the variables and responses were accurate. A porous mortar with a compressive strength over 30 MPa and a permeability coefficient over 7 mm/s could be conveniently designed by RSM. Additionally, the compressive strength of the porous concrete reached more than 40 MPa at a P/A of 0.26.
Controlled release of heparin from polypyrrole‐poly(vinyl alcohol) assembly by electrical stimulation
Publisher: Wiley
Date: 09-03-2005
DOI: 10.1002/JBM.A.30286
Abstract: A surface modification technique was developed for the covalent immobilization of poly(vinyl alcohol) (PVA)-heparin hydrogel onto electrically conductive polypyrrole (PPY) film with the objective of achieving controlled release of heparin. First, aldehyde groups were introduced onto PPY film through poly(ethylene glycol) monomethacrylate graft copolymerization and subsequent oxidation in acetic anhydride and dimethyl sulfoxide mixture. Then, the prepared PVA-heparin hydrogel was cast onto the PPY film and covalently immobilized to the film through the reaction between the aldehyde groups on the PPY film and the hydroxyl groups of PVA. X-ray photoelectron spectroscopy was used to characterize the surface-modified film after each stage. The strong attachment of the PVA-heparin layer on the PPY film was confirmed by peel test and scanning electron microscopy. The release behavior of heparin from the substrate with and without electrical stimulation was studied and the experimental results showed that the heparin release rate from the prepared substrate using an electric current of 3.5 mA is twofold higher than that without current.
Physicochemical and blood compatibility characterization of polypyrrole surface functionalized with heparin
Publisher: Wiley
Date: 05-09-2003
DOI: 10.1002/BIT.10757
Abstract: A surface modification technique was developed for the covalent immobilization of heparin onto electrically conductive polypyrrole (PPY) film. The PPY film was first graft copolymerized with poly(ethylene glycol) methacrylate (PEGMA) and then activated with cyanuric chloride (CC). Heparin was then immobilized onto the film through the reaction between the chloride groups of CC and the amine and/or hydroxyl groups of heparin. X-ray photoelectron spectroscopy (XPS) was used to characterize the surface-modified film after each stage. The biocompatibility of the surface-modified PPY was evaluated using plasma recalcification time (PRT) and platelet adhesion. After surface modification, the film had improved wettability while retaining significant electrical conductivity. With immobilized heparin, platelet adhesion and platelet activation on PPY film was significantly suppressed, and the PRT was significantly prolonged. Electrical stimulation also plays a positive role in decreasing platelet adhesion and increasing PRT on pristine and surface-modified PPY films.
Retention and survival of E. coli in stormwater biofilters: Role of vegetation, rhizosphere microorganisms and antimicrobial filter media
Publisher: Elsevier BV
Date: 05-2017
Enhanced mechanical and photocatalytic performance of cement mortar reinforced by nano-TiO2 hydrosol-coated sand
Publisher: Elsevier BV
Date: 03-2023
Strength and durability of marine cement-based mortar modified by colloidal nano-silica with epoxy silane for low CO2 emission
Publisher: Elsevier BV
Date: 2023
Porous and Electrically Conductive Polypyrrole−Poly(vinyl alcohol) Composite and Its Applications as a Biomaterial
Publisher: American Chemical Society (ACS)
Date: 27-09-2005
DOI: 10.1021/LA0514314
Abstract: Bulk modification of polypyrrole (PPY) with poly(vinyl alcohol) (PVA) was carried out by the electropolymerization of pyrrole in the presence of PVA in the reaction solution, with tetraethylammonium perchlorate (TEAP) as the electrolyte. The surface morphology of the as-synthesized PPY-TEAP-PVA film was investigated using scanning electron microscopy, and the film was further characterized using X-ray photoelectron spectroscopy, electrical conductivity, the water contact angle, and BET surface area measurements. The PPY-TEAP-PVA composite is electrically conductive, hydrophilic, and microporous with a high surface area. Its potential as a biomaterial was investigated with respect to its blood compatibility and function as a substrate for biosensor fabrication and cell culture. The presence of PVA in the film attenuates blood protein adsorption, and the porous nature of the PPY-TEAP-PVA film results in a 10-fold increase in the amount of glucose oxidase covalently immobilized on the film over that on a nonporous PPY film. PC12 cell attachment and growth on the PPY-TEAP-PVA film was also shown to be enhanced compared with that on tissue culture polystyrene. The attached cells proliferated and formed a monolayer on the film surface after 48 h of seeding.
Heparin-Coupled Poly(poly(ethylene glycol) monomethacrylate)-Si(111) Hybrids and Their Blood Compatible Surfaces
Publisher: American Chemical Society (ACS)
Date: 08-04-2005
DOI: 10.1021/BM050071W
Abstract: Well-defined (nearly monodispersed) poly(poly(ethylene glycol)monomethacrylate)-Si hybrids were prepared via surface-initiated atom transfer radical polymerization (ATRP) of the poly(ethylene glycol)monomethacrylate (PEGMA) macromonomer on the hydrogen-terminated Si(111) surface (Si-H surface). Both the active chloride groups at the chain ends (from the ATRP process) and the chloride groups converted from some ( approximately 32%) of the -OH groups of the Si-C bonded PEGMA polymer, or P(PEGMA), brushes were used as leaving groups for the covalent coupling of heparin. For the heparinized P(PEGMA)-Si hybrid surfaces, protein adsorption and platelet adhesion were significantly suppressed. The well-defined and dense P(PEGMA) brushes, prepared from surface-initiated ATRP, had allowed the immobilization of a relatively high concentration of heparin (about 14 mug/cm(2)). The resulting silicon surface exhibited significantly improved antithrombogenecity with a plasma recalcification time (PRT) of about 150 min. The persistence of high bioactivity for the immobilized heparin on the hybrid surfaces can be attributed to the biocompatibility of the PEGMA units, as well as their role as spacers in providing the immobilized heparin with a higher degree of conformational freedom in a more hydrophilic environment. Thus, the heparin-coupled P(PEGMA)-Si hybrids with anti-fouling and antithrombogenic surfaces are potentially useful in silicon-based implantable devices and tissue engineering.
Poly(vinyl alcohol) hydrogel fixation on poly(ethylene terephthalate) surface for biomedical application
Publisher: Elsevier BV
Date: 12-2004
Hydration characteristics, structure evolution of marine cement composites with high durability modified by colloidal nano-silica for low carbon footprints
Publisher: Elsevier BV
Date: 09-2023
A novel strategy to reinforce double network hydrogels with enhanced mechanical strength and swelling ratio by nano cement hydrates
Publisher: Elsevier BV
Date: 03-2023
Escherichia coli removal in copper-zeolite-integrated stormwater biofilters: Effect of vegetation, operational time, intermittent drying weather
Publisher: Elsevier BV
Date: 05-2016
Investigation on water and fertilizer retention properties of hydrated sulphoaluminate cement pastes modified by bentonite for porous ecological concrete
Publisher: Elsevier BV
Date: 07-2023
Copper(II) hydroxide/oxide-coated granular activated carbon for E. coli removal in water
Publisher: IWA Publishing
Date: 12-2022
DOI: 10.2166/BGS.2022.027
Abstract: Low-cost granular filter media with hybrid bacterial adsorption and survival inhibition capability is highly desired for the development of a low-impact water filtration system. In addition to overall removal, a deeper understanding of the fate and transport behaviour of bacteria in such systems should also be obtained to guide system operation. In this study, copper(II) hydroxide nanoparticles-modified granular activated carbon via a single-step in situ coating was prepared and denoted as CuH-G. Copper release behaviour and Escherichia coli removal efficiency of CuH-G were studied in saturated columns as a function of salinity, flow rate, and hydraulic loading. Copper release decreased exponentially on increasing salinity in test water, which potentiates controlled copper release for desired bacteria inhibition efficiency. With an effective contact time of 3.7 min, CuH-G provided 3.0 and 1.6 log E. coli removal in test water of salinity 237 and 680 μS/cm, respectively. Copper leaching at these two salinities were 1.7 and 0.74 mg/l, respectively below the Australian Guidelines for Water Recycling: Augmentation of Drinking Water Supplies. Further study of E. coli transport and deposition behaviour in heat-treated CuH-G at 160 °C revealed that the observed removal was largely attributed to enhanced attachment during filtration and survival inhibition post filtration.
Stable copper-zeolite filter media for bacteria removal in stormwater
Publisher: Elsevier BV
Date: 05-2014
DOI: 10.1016/J.JHAZMAT.2014.03.036
Abstract: Cu(2+)-exchanged zeolite (ZCu) as antibacterial media shows great potential for bacteria removal from stormwater, but its stability in high salinity water needs attention. In this study, stable antibacterial media were developed by modifying ZCu through calcination and in situ Cu(OH)2 coating. Their stability and Escherichia coli removal efficiency along with impact of salinity were examined in gravity-fed columns. While copper leaching from ZCu was 20mg/L in test water of salinity 250μS/cm, it was reduced by over 97% through Cu(OH)2 coating and/or calcination. ZCu coated with Cu(OH)2 followed by heat treatment at 180°C (ZCuCuO180) exhibited more consistent E. coli removal (1.7-2.7 log) than ZCu (1.2-3.3 log) in test water of varied salinity but constant contact time 22min. ZCu calcined at 400°C (ZCu400) effectively inactivated removed bacteria during 24h drying period. In the presence of native microbial communities, new sand filters, particularly those having ZCu400 at the top to inactivate bacteria during drying periods and ZCuCuO180 midway to capture and inactivate microbes during wet events, provided the best bacterial removal (1.7 log, contact time 9min). Copper leaching from this design was 9μg/L, well below long-term irrigation standard of 200μg/L.
In-situ dispersion of nano-TiO2 to highly reinforce cement paste
Publisher: Elsevier BV
Date: 12-2023
Removal of E. coli from urban stormwater using antimicrobial-modified filter media
Publisher: Elsevier BV
Date: 04-2014
DOI: 10.1016/J.JHAZMAT.2014.01.057
Abstract: Stormwater filters featuring traditional sand filter media cannot reliably treat indicator bacteria for stormwater harvesting. In this work, copper-modified zeolite and granular activated carbon (GAC) were prepared through Cu(2+) impregnation and in situ Cu(OH)2 precipitation. Their antibacterial properties and stability in natural stormwater were studied in gravity-fed columns for 24 weeks, under typical stormwater operational conditions. 11 types of other filter media, prepared using zinc, iron, titanium and quaternary ammonium salts as antibacterial agents, were tested in parallel by way of comparison. Cu(2+)-immobilised zeolite and Cu(OH)2-coated GAC yielded an estimated 2-log reduction of E. coli within 40 min with the presence of other native microbial communities in natural stormwater. Even at high flow velocity (effective contact time of 4.5 min), both media demonstrated 0.8 log removal. Both media and Cu(2+)-treated GAC showed effective inactivation of the removed E. coli during dry periods. Copper leaching from Cu(OH)2-coated GAC was found to be below the NHMRC specified drinking water standard, while that from Cu(2+)-immobilised zeolite varied with the salinity in stormwater. These findings could provide useful information for further development of passive stormwater harvesting systems.
Agglomeration behavior of colloidal nano-silica and its effect on pore structure, mechanical properties and shrinkage of cement mortar
Publisher: Elsevier BV
Date: 12-2023
Rheological properties, shape stability and compressive strength of 3D printed colored cement composites modified by needle-like pigment
Publisher: Elsevier BV
Date: 09-2022
Related Organisations
Related Funding Activities
ARC Future Fellowships - Grant ID: FT200100985
Start Date: 05-2021
End Date: 05-2025
Amount: $738,000.00
Funder: Australian Research Council
View Funded ActivityIndustrial Transformation Research Hubs - Grant ID: IH230100013
Start Date: 06-2024
End Date: 06-2029
Amount: $5,000,000.00
Funder: Australian Research Council
View Funded Activity