ORCID Profile
0000-0003-0826-4919
Current Organisation
RMIT University Bundoora Campus
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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.
Civil Engineering | Urban and Regional Planning not elsewhere classified | Structural Engineering | Construction Materials |
Environmentally Sustainable Manufacturing not elsewhere classified | Environmentally Sustainable Construction not elsewhere classified
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 08-2008
Publisher: Informa UK Limited
Date: 11-02-2018
Publisher: American Chemical Society (ACS)
Date: 10-06-2019
Abstract: The colonization of undesired bacteria on the surface of devices used in biomedical and clinical applications has become a persistent problem. Different types of single-function (cell resistance or bactericidal) bioresponsive materials have been developed to cope with this problem. Even though these materials meet the basic requirements of many biomedical and clinical applications, dual-function (cell resistance and biocidal) bioresponsive materials with superior design and function could be better suited for these applications. The past few years have witnessed the emergence of a new class of dual-function materials that can reversibly switch between cell-resistance and biocidal functions in response to external stimuli. These materials are finding increased applications in biomedical devices, tissue engineering, and drug-delivery systems. This review highlights the recent advances in design, structure, and fabrication of dual-function bioresponsive materials and discusses translational challenges and future prospects for research involving these materials.
Publisher: Wiley
Date: 13-04-2022
DOI: 10.1002/PAT.5692
Abstract: This study deals with the improvement of light barrier properties and stress cracking strength of polyethylene terephthalate (PET) packaging materials by incorporating calcium metaborate (CaB 2 O 4 ). CaB 2 O 4 powders were synthesized by the sol–gel method. After the extrusion process produced PET/ CaB 2 O 4 granules, the preform and bottle production was carried out by injection molding and blow molding. Compared to pure PET, UV transmittance is reduced (~88%), and it is more effective at lower wavelengths ( nm). Similarly, the presence of CaB 2 O 4 improved the environmental stress cracking performance of PET packaging materials. While the burst strength increased in the range of 0.05%–0.2% CaB 2 O 4 concentration, it decreased at higher concentrations. The load‐carrying capacity is approximately 109% higher than pure PET. Acetic acid (COOH) degradation increased with the incorporation of CaB 2 O 4 particles, while isophthalic acid and diethylene glycol degradations did not change. The experimental data indicate that the photocatalytic degradation of the PET bottle is prevented significantly, and its mechanical performance is also improved with the incorporation of CaB 2 O 4 . Thanks to this novel product, the quality of food and beverages in PET packaging materials can be protected from the harmful effects of light, and the deformation of PET packaging materials can be prevented for various reasons.
Publisher: Elsevier BV
Date: 02-2011
Publisher: Wiley
Date: 21-05-2021
DOI: 10.1002/PEN.25720
Abstract: Polyethylene terephthalate (PET)/nano‐hydroxyapatite (nHAp) composite granules were obtained using twin‐screw extruder. Preforms were prepared by injection molding and then PET/nHAp bottles were produced by blow molding. For PET bottles with nHAp, the migration amounts of carboxylic acid (COOH), acetaldehyde (AA), diethylene glycol (DEG), and isophthalic acid (IPA) glass transition temperature ( T g ) melting temperature ( T m ) and the maximum crystallization temperature ( T cry ) were measured. The load‐carrying capacity, burst strength, stress cracking, and regional material distribution tests were carried out on the bottles. X‐ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry, and ultraviolet transmittance analyses were conducted to explain the changes in mechanical, chemical, physical properties, and light transmission of bottles. It was found out that the COOH amount increased and the AA content decreased with increasing nHAp amount. On the other hand, no change was observed in the amounts of DEG and IPA. Although the mechanical properties such as load‐carrying capacity and burst strength of the bottles have improved, it has been determined that the standard environmental stress crack resistance test procedure cannot be applied to such a composite. Experimental findings indicate that nHAp disrupts the chemical structure of PET and it isolates harmful chemicals such as AA by forming intermolecular bonds. Moreover, with the addition of up to 0.8% nHAp, PET bottles block the light transmission approximately 80% within 400–700 nm wave length zone. The study demonstrates that the PET/nHAp composite bottles can be used in the food industry, particularly in the packaging of milk and milk products which are vulnerable to light exposure.
Publisher: Wiley
Date: 21-10-2020
DOI: 10.1002/APP.48630
Publisher: Wiley
Date: 2004
DOI: 10.1002/PEN.20155
Publisher: Elsevier BV
Date: 05-2011
DOI: 10.1016/J.ULTRAMIC.2010.12.027
Abstract: Though the atom probe has provided unprecedented atomic identification and spatial imaging capability, the basic reconstruction assumption of a smooth hemispherical tip shape creates significant challenges in yielding high fidelity chemical information for atomic species with extreme differences in fields required for field evaporation. In the present study, the evaporation behavior and accompanying artifacts are examined for the super-cell lattice structure of L1(0) FePt, where alternating Fe and Pt planes exist in the [0 0 1] orientation. Elemental Fe and Pt have significant differences in field strengths providing a candidate system to quantify these issues. Though alloys can result in changes in the elemental field strength, the intrinsic nature of elemental planes in [0 0 1] L1(0) provides a system to determine to what extent basic assumptions of elemental field strengths can break down in understanding reconstruction artifacts in this intermetallic alloy. The reconstruction of field evaporation experiments has shown depletion of Fe at the (0 0 2) pole and zone axes. Compositional profiles revealed an increase in Fe and atom count moving outward from the pole. The depletion at the low indexed pole and zone axes was determined to be the result of local magnification and electrostatic effects. The experimental results are compared to an electrostatic simulation model.
Publisher: Elsevier BV
Date: 03-2015
Publisher: Elsevier BV
Date: 07-2021
Publisher: Wiley
Date: 29-04-2012
DOI: 10.1002/APP.36925
Publisher: Trans Tech Publications, Ltd.
Date: 12-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.667-669.181
Abstract: The effect of grain size on the deformation twinning and de-twinning in a nanocrystalline Ni-Fe alloy was investigated using transmission electron microscopy. Specimens with different grain sizes were obtained by severely deforming an electrochemically deposited nanocrystalline Ni-20wt.% Fe alloy using high-pressure torsion, which resulted in continuous grain growth from an average grain size of ~ 21 nm in the as-deposited material to ~ 72 nm for the highest strain applied in this study. Results show that deformation de-twinning occurs at very small grain sizes while deformation twinning takes place when the grain size is larger than ~ 45 nm. The mechanism of the observed grain size effect on twinning and de-twinning is briefly discussed.
Publisher: Elsevier BV
Date: 08-2017
Publisher: MDPI AG
Date: 03-09-2020
Abstract: Graphene–polyamide-6 (PA6) composites with up to 17.0%·w/w graphene content were prepared via melt mixing. Oscillatory rheometry revealed that the dynamic viscoelastic properties of PA6 decreased with the addition of 0.1%·w/w graphene but increased when the graphene content was increased to 6.0%·w/w and higher. Further analysis indicated that the rheological percolation threshold was between 6.0 and 10.0%·w/w graphene. The Carreau–Yasuda model was used to describe the complex viscosity of the materials. Capillary rheometry was applied to assess the steady shear rheology of neat PA6 and the 17.0%·w/w graphene–PA6 composite. High material viscosity at low shear rates coupled with intense shear-thinning in the composite highlighted the importance of selecting the appropriate rheological characterisation methods, shear rates and rheological models when assessing the 3D printability of percolated graphene–polymer composites for material extrusion (ME). A method to predict the printability of an ME filament feedstock, based on fundamental equations describing material flow through the printer nozzle, in the form of a printing envelope, was developed and verified experimentally. It was found that designing filaments with steady shear viscosities of approximately 15% of the maximum printable viscosity for the desired printing conditions will be advantageous for easy ME processing.
Publisher: Elsevier BV
Date: 09-2019
Publisher: Author(s)
Date: 2019
DOI: 10.1063/1.5084880
Publisher: IGI Global
Date: 2017
DOI: 10.4018/978-1-5225-1798-6.CH067
Abstract: Materials engineering applications are becoming more widespread, varied and sophisticated due to advances in science and increasing interdisciplinary cooperation. To be able to impart engineering graduates with the required technical background, educators need to update the course syllabus and the program curriculum continuously. Most importantly, in a world of constant change, educators need to develop the right graduate capabilities in engineering students. This calls for new, innovative teaching approaches to materials education. This chapter demonstrates the authors' teaching approach through the design and development of an Automotive Materials course at postgraduate level in an ‘International Automotive Engineering' program at RMIT University in Melbourne, Australia. To elucidate this teaching approach to materials education, the authors discuss in detail the need to impart an up-to-date understanding of new, alternative materials, the development of graduate capabilities, interdisciplinary systems thinking towards materials education, and the environmental sustainability of engineering materials.
Publisher: American Physical Society (APS)
Date: 12-2011
Publisher: Walter de Gruyter GmbH
Date: 09-2000
DOI: 10.3139/217.1601
Abstract: An analytical and experimental study of the transient flow behavior of polymer melt in injection molding is presented. The polymer volume flow rate into a rectangular mold cavity during the filling stage was determined using the Reynold's transport theory. The analysis, which neglects melt elasticity, shows that the flow rate is transient during the initial filling of the cavity. Moreover, the cavity flow rate was found to depend on material compressibility and expansivity, total volume upstream of the gate as well as time rate of change of melt pressure and temperature. Experimental results obtained through direct flow visualization are in good agreement with the theory. The effect of gate size on the cavity flow rate was also examined. A small gate gives rise to a greater degree of melt compressibility in the runner system. The prediction of actual flow rates into the cavity not only enhances determination of the interrelationship of flow rate, morphology, and properties in injection molding but also aids in the avoidance of molding defects. The results of this study can be used to improve the accuracy of CAE analysis.
Publisher: Wiley
Date: 06-10-2020
DOI: 10.1002/POL.20200560
Publisher: American Institute of Physics
Date: 2014
DOI: 10.1063/1.4873798
Publisher: IGI Global
Date: 2015
DOI: 10.4018/978-1-4666-8183-5.CH003
Abstract: Materials engineering applications are becoming more widespread, varied and sophisticated due to advances in science and increasing interdisciplinary cooperation. To be able to impart engineering graduates with the required technical background, educators need to update the course syllabus and the program curriculum continuously. Most importantly, in a world of constant change, educators need to develop the right graduate capabilities in engineering students. This calls for new, innovative teaching approaches to materials education. This chapter demonstrates the authors' teaching approach through the design and development of an Automotive Materials course at postgraduate level in an ‘International Automotive Engineering' program at RMIT University in Melbourne, Australia. To elucidate this teaching approach to materials education, the authors discuss in detail the need to impart an up-to-date understanding of new, alternative materials, the development of graduate capabilities, interdisciplinary systems thinking towards materials education, and the environmental sustainability of engineering materials.
Publisher: Elsevier BV
Date: 03-2021
Publisher: Springer Science and Business Media LLC
Date: 13-04-2011
Abstract: In this article, we demonstrate that carbon nanostructures could be synthesized on the Ni-plated YG6 (WC-6 wt% Co) hardmetal substrate by a simple ethanol diffusion flame method. The morphologies and microstructures of the Ni-plated layer and the carbon nanostructures were examined by various techniques including scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. The growth mechanism of such carbon nanostructures is discussed. This work may provide a strategy to improve the performance of hardmetal products and thus to widen their potential applications.
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9TA05185F
Abstract: This review attempts to highlight the recent progress in the design, synthesis and fabrication of fluorine-free superhydrophobic surfaces.
Publisher: Elsevier BV
Date: 2016
Publisher: Wiley
Date: 15-12-2009
DOI: 10.1002/APP.30990
Publisher: Walter de Gruyter GmbH
Date: 04-2014
DOI: 10.1515/POLYENG-2013-0168
Abstract: Biocomposites incorporating cellulose fibres, a renewable resource, have high modulus and strength and flexibility suitable for structural applications. Solution casting, ultrasonication, and compression moulding methods were used to prepare the specimens. Results show that plasticiser indeed improved the flexibility of the composite and adding fillers further enhanced the performance of the composite.
Publisher: Wiley
Date: 26-12-1995
Publisher: American Chemical Society (ACS)
Date: 19-03-2009
DOI: 10.1021/MA802041N
Publisher: Springer Science and Business Media LLC
Date: 2004
Publisher: Elsevier BV
Date: 08-2021
Publisher: Duzce Universitesi Bilim ve Teknoloji Dergisi
Date: 31-07-2023
Abstract: The purpose of this work is to improve mechanical properties of rigid polyurethane (RPU) composites used in traditional ceramic casting industry. Therefore, monofilament (mono) and fibermesh (fibril) polypropylene (PP) fibers with various lengths (3, 6, 12 and 18 mm) were incorporated to polymer matrix at different rates (0.5, 1.0, 1.5 and 2% by weight). Effects of fiber type and content on flexural strength, bending strength and compressive strength of composites were investigated. Surface morphology and thermal characteristics of composites were evaluated by SEM and TGA analysis, respectively. Bulk densities of specimens with and without PP fibers vary between 72,15-146 kg/m3. Compared to pure rigid polyurethane foam, bulk density of monofilament PP reinforced composites significantly increased and the highest density value (146,86 kg/m3) was reached in M6/2.0 s le. On the other hand, incorporation of fibrilmesh caused a decrease in bulk density. While the increase in percentage of mono PP increased flexural strength, the presence of fibril PP had a negative effect on strength. Compressive strength of all mono PP reinforced composites is higher than that of pure RPU, except for M6/0.5 s le. Besides, SEM analysis revealed that the presence of PP fibers generally reduced number of closed cells in composite structure. Experimental findings indicate that fiber type, content and length affect mechanical performance of RPU composites. In addition, it is possible to use mono PP fiber reinforced RPU composites as support apparatus in ceramic casting industry.
Publisher: Springer Science and Business Media LLC
Date: 27-04-2011
Abstract: Poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with nitric and chlorine ions have been electrochemically deposited simply by a one-step electrochemical method in an aqueous media in the absence of any surfactant. The fabricated PEDOT films were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The results indicate that the hierarchical structured PEDOT film doped with nitric ions displays a 'lunar craters' porous morphology consisting of PEDOT nano-sheets with a thickness of less than 2 nm. The effect of counter ions on the electro-polymerization, the electrochemistry, and the morphology of the polymer film was studied. Compared with PEDOT film doped with nitric acid, PEDOT film deposited in the presence of chlorine ions shows irregular morphology and less electrochemical activity. The specific nanostructure of the polymer was further studied as catalyst support for platinum nanoparticles to methanol electro-oxidation.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Wiley
Date: 15-10-2009
DOI: 10.1002/APP.30644
Publisher: Elsevier BV
Date: 09-2011
Publisher: Wiley
Date: 17-09-2020
DOI: 10.1002/APP.49909
Publisher: Wiley
Date: 07-05-2012
DOI: 10.1002/APP.36780
Publisher: MDPI AG
Date: 25-03-2021
Abstract: Surface texturing is a common modification method for altering the surface properties of a material. Predicting the response of a textured surface to scratching is significant in surface texturing and material design. In this study, scratches on a thermoplastic material with textured surface are simulated and experimentally tested. The effect of texture on scratch resistance, surface visual appearance, surface deformation and material damage are investigated. Bruise spot scratches on textured surfaces are found at low scratch forces ( N) and their size at different scratch forces is approximately the same. There is a critical point between the bruise spot damage and the texture pattern damage caused by continuous scratching. Scratch resistance coefficients and an indentation depth-force pattern are revealed for two textured surfaces. A texture named “Texture CB” exhibits high effectiveness in enhancing scratch visibility resistance and can increase the scratch resistance by more than 40% at low scratch forces. The simulation method and the analysis of the power spectral density of the textured surface enable an accurate prediction of scratches.
Publisher: Springer Science and Business Media LLC
Date: 15-02-2011
Publisher: Wiley
Date: 27-06-2022
DOI: 10.1002/PAT.5786
Abstract: The current study aimed to produce polyethylene terephthalate (PET)/takedaite (Ca 3 B 2 O 6 ) composite bottles, an innovative packaging material with better performance. For this, Ca 3 B 2 O 6 was firstly synthesized by sol–gel route and then it was incorporated to PET at five rates by extrusion. Finally, preform and PET bottles were produced by injection and stretch‐blow‐molding processes, respectively. The results showed that the use of Ca 3 B 2 O 6 significantly improved the mechanical performance and UV transmittance of PET. Compared to pure PET, the load‐carrying capacity and burst strength enhanced by 133.66% and 54.16%, respectively. Environmental stress cracking (ESC) time increased from 0.3 to 18 min at 0.8% Ca 3 B 2 O 6 concentration. Moreover, UV transmittance (~85%) of PET decreased to approximately ~18% in the visible region with the incorporation of 0.8 wt% Ca 3 B 2 O 6 . In terms of chemical degradation, Ca 3 B 2 O 6 incorporation did not change the diethylene glycol (DEG) and isophthalic acid (IPA) rates, however it played an enhancing and reductive role in acetaldehyde (AA) and carboxylic acid (COOH) degradations, respectively. Accordingly, this novel product offers the opportunity to minimize the problems that may occur due to transportation/storage and photocatalytic degradation of food and beverages in PET packaging.
Publisher: Elsevier BV
Date: 2012
Publisher: MDPI AG
Date: 15-12-2016
DOI: 10.3390/POLYM8120437
Publisher: Wiley
Date: 2011
DOI: 10.1002/JEMT.20958
Abstract: A limiting characteristic of the atom-probe technique is the nondetection of ions and this embodies a significant "missing information" problem in investigations of atomic clustering phenomena causing difficulty in the interpretation of any atom-probe experiment. It is shown that the measurable cluster-size distribution can be modeled by a mixed binomial distribution. A deconvolution method based upon expectation-maximization (EM) algorithm is presented to obtain the original physical distribution from an efficiency-degraded distribution, thereby providing means to calculate accurate cluster number densities from atom probe results. The accuracy of this restoration was predominantly dependent upon the detector efficiency and was proved to be highly accurate in the case of conventional atom-probe detector efficiencies (ε = 57%). Such considerations and measures are absolutely necessary when the number density of clusters and small precipitates is in any way regarded as important. We conclude that limitations in detector efficiency are more limiting for cluster-finding analyses via atom-probe techniques than spatial resolution issues, and therefore the current endeavors for improving detector technologies are well found.
Publisher: Wiley
Date: 28-09-2012
DOI: 10.1002/PEN.23333
Publisher: Elsevier BV
Date: 06-2021
Publisher: Author(s)
Date: 2016
DOI: 10.1063/1.4965574
Publisher: Springer Science and Business Media LLC
Date: 23-09-2017
Publisher: Elsevier BV
Date: 11-2018
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 05-2018
Publisher: American Scientific Publishers
Date: 08-2017
Publisher: Elsevier BV
Date: 10-2020
Publisher: Wiley
Date: 11-1986
Start Date: 07-2021
End Date: 07-2026
Amount: $5,000,000.00
Funder: Australian Research Council
View Funded Activity