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Al Mamun A, Ullah A, Chowdhury MEH, Marei HE, Madappura AP, Hassan M, Rizwan M, Gomes VG, Amirfazli A, Hasan A. Oxygen releasing patches based on carbohydrate polymer and protein hydrogels for diabetic wound healing: A review. Int J Biol Macromol 2023; 250:126174. [PMID: 37558025 DOI: 10.1016/j.ijbiomac.2023.126174] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 07/31/2023] [Accepted: 08/05/2023] [Indexed: 08/11/2023]
Abstract
Diabetic wounds are among the major healthcare challenges, consuming billions of dollars of resources and resulting in high numbers of morbidity and mortality every year. Lack of sufficient oxygen supply is one of the most dominant causes of impaired healing in diabetic wounds. Numerous clinical and experimental studies have demonstrated positive outcomes as a result of delivering oxygen at the diabetic wound site, including enhanced angiogenesis, antibacterial and cell proliferation activities. However, prolonged and sustained delivery of oxygen to improve the wound healing process has remained a major challenge due to rapid release of oxygen from oxygen sources and limited penetration of oxygen into deep skin tissues. Hydrogels made from sugar-based polymers such as chitosan and hyaluronic acid, and proteins such as gelatin, collagen and hemoglobin have been widely used to deliver oxygen in a sustained delivery mode. This review presents an overview of the recent advances in oxygen releasing hydrogel based patches as a therapeutic modality to enhance diabetic wound healing. Various types of oxygen releasing wound healing patch have been discussed along with their fabrication method, release profile, cytocompatibility and in vivo results. We also briefly discuss the challenges and prospects related to the application of oxygen releasing biomaterials as wound healing therapeutics.
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Affiliation(s)
- Abdulla Al Mamun
- Department of Mechanical and Industrial Engineering, Qatar University, Doha, Qatar; Biomedical Research Center (BRC), Qatar University, Doha, Qatar
| | - Asad Ullah
- Department of Mechanical and Industrial Engineering, Qatar University, Doha, Qatar; Biomedical Research Center (BRC), Qatar University, Doha, Qatar
| | | | - Hany E Marei
- Department of Cytology and Histology, Faculty of Veterinary Medicine, Mansoura University, Mansoura, Egypt
| | - Alakananda Parassini Madappura
- Department of Mechanical and Industrial Engineering, Qatar University, Doha, Qatar; Biomedical Research Center (BRC), Qatar University, Doha, Qatar
| | - Mahbub Hassan
- School of Chemical & Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
| | | | - Vincent G Gomes
- School of Chemical & Biomolecular Engineering, The University of Sydney, NSW 2006, Australia; Sydney Nano Institute, Sydney, NSW 2006, Australia
| | - Alidad Amirfazli
- Department of Mechanical Engineering, York University, Toronto, ON, Canada
| | - Anwarul Hasan
- Department of Mechanical and Industrial Engineering, Qatar University, Doha, Qatar; Biomedical Research Center (BRC), Qatar University, Doha, Qatar.
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Sairi F, Gomes VG, Dehghani F, Valtchev P. Lipoprotein-induced cell growth and hemocyanin biosynthesis in rhogocytes. Cell Tissue Res 2022; 388:359-371. [PMID: 35088179 PMCID: PMC9035422 DOI: 10.1007/s00441-022-03577-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Accepted: 01/10/2022] [Indexed: 11/30/2022]
Abstract
Rhogocyte is a unique molluscan cell that synthesises a supramolecular respiratory protein known as hemocyanin. Its ability to synthesise the protein has eluded the scientists despite hemocyanin's importance as a carrier protein and complex molecule with anti-viral activity. Although a hypothetical model of hemocyanin release from the rhogocytes lacunae was proposed based on colloid-osmotic pressure mechanism, lack of in vitro studies limits further validation of this model. In this study, we aim to investigate the impact of cell culture conditions and nature of hemocyanin biosynthesis of rhogocyte cells dissociated from Haliotis laevigata mantle tissue. Population of cells with different hemocyanin expression levels was profiled using flow cytometry, while hemocyanin concentrations in the media were elucidated by ELISA assay. We demonstrated that addition of lipoprotein supplement into the media resulted in a burst secretion of hemocyanin into the culture media. Over 7 days of culture, the population of cells tagged with hemocyanin antibody increased steadily while hemocyanin release in the media decreased significantly. Variation of culture medium, temperature, growth supplement type and concentration also impacted the cell growth and hemocyanin biosynthesis. These results indicated the possibility of an active process triggered by the addition of supplement to synthesise the protein at the highest amount during the first hour. The current study provides a glimpse of the hemocyanin biosynthesis by rhogocyte that may be significant to understand the cell ability to synthesise supramolecular protein and secretion through lacunae.
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Affiliation(s)
- Fareed Sairi
- School of Chemical and Bio Molecular Engineering, University of Sydney, Sydney, 2006, Australia
- Department of Biological Sciences and Biotechnology, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600, Bangi, Malaysia
| | - Vincent G Gomes
- School of Chemical and Bio Molecular Engineering, University of Sydney, Sydney, 2006, Australia
| | - Fariba Dehghani
- School of Chemical and Bio Molecular Engineering, University of Sydney, Sydney, 2006, Australia
| | - Peter Valtchev
- School of Chemical and Bio Molecular Engineering, University of Sydney, Sydney, 2006, Australia.
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Mahmud Z, Nasrin A, Hassan M, Gomes VG. 3D‐printed polymer
nanocomposites with carbon quantum dots for enhanced properties and in situ monitoring of cardiovascular stents. POLYM ADVAN TECHNOL 2021. [DOI: 10.1002/pat.5572] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zaheri Mahmud
- School of Chemical and Biomolecular Engineering The University of Sydney Sydney New South Wales Australia
| | - Aklima Nasrin
- School of Chemical and Biomolecular Engineering The University of Sydney Sydney New South Wales Australia
| | - Mahbub Hassan
- School of Chemical and Biomolecular Engineering The University of Sydney Sydney New South Wales Australia
| | - Vincent G. Gomes
- School of Chemical and Biomolecular Engineering The University of Sydney Sydney New South Wales Australia
- Nano Institute The University of Sydney Sydney New South Wales Australia
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Nasrin A, Hassan M, Mirabet MM, Windhab N, Gomes VG. 3D-printed bioresorbable poly(lactic-co-glycolic acid) and quantum-dot nanocomposites: Scaffolds for enhanced bone mineralization and inbuilt co-monitoring. J Biomed Mater Res A 2021; 110:916-927. [PMID: 34881814 DOI: 10.1002/jbm.a.37340] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 11/08/2021] [Accepted: 11/12/2021] [Indexed: 11/09/2022]
Abstract
Multifunctional 3D-printed nanocomposites based on poly(lactic-co-glycolic acid), that is, PLGA (RESOMER® LG857S) were developed for simultaneous monitoring of cells and scaffold as a function of time and spectral responses. These were achieved by impregnating carbon quantum dots (CQDs) on PLGA using melt-blending, plasticating extrusion, and 3D-printing. The nanocomposites enabled enhanced bio-affinity and cellular interactions for bone tissue engineering (TE). PLGA (control) and PLGA-CQD scaffolds were used for growing human adipose-derived-stem-cells (ADSCs) and tested for cell biocompatibility, cellular adhesion, growth, and osteogenesis. CQDs were found to enhance the hydrophilicity of nanocomposites and promote cellular nesting. MTS assays confirmed that CQDs on PLGA act as cell anchoring sites, thereby enhancing seeding efficiency and cell proliferation. Alkaline phosphate tests showed increased osteogenesis and Alizarin assays confirmed enhanced bone mineralization on PLGA-CQD. The qPCR tests based on selected mRNA expressions showed that the incorporation of CQDs significantly enhanced osteogenesis of ADSCs during all three phases of cell differentiation. The intrinsic luminescence of the composites allowed label-free monitoring of cell proliferation and bone mineralization on the scaffolds. Thus, the CQDs facilitated significant enhancements in composite processability with customized fabrication of 3D printed scaffolds, bone tissue osteoconductivity, and monitoring of cell-scaffold activities, offering multifunctional benefits for bone TE.
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Affiliation(s)
- Aklima Nasrin
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia
| | - Mahbub Hassan
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia
| | | | - Norbert Windhab
- Evonik Nutrition & Care GmbH, Kirschenallee, Darmstadt, Germany
| | - Vincent G Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, 2006, Australia.,Nano Institute, The University of Sydney, Camperdown, Australia
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Jaiswal A, Rani S, Singh GP, Hassan M, Nasrin A, Gomes VG, Saxena S, Shukla S. Additive-Free All-Carbon Composite: A Two-Photon Material System for Nanopatterning of Fluorescent Sub-Wavelength Structures. ACS Nano 2021; 15:14193-14206. [PMID: 34435496 DOI: 10.1021/acsnano.1c01083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The major bottleneck in fabrication of engineered 3D nanostructures is the choice of materials. Adding functionality to these nanostructures is a daunting task. In order to mitigate these issues, we report a two-photon patternable all carbon material system which can be used to fabricate fluorescent 3D micro/nanostructures using two-photon lithography, with subwavelength resolution. The synthesized material system eliminates the need to use conventional two-photon absorbing materials such as two-photon dyes or two-photon initiators. We have used two different trifunctional acrylate monomers and carbon dots, synthesized hydrothermally from a polyphenolic precursor, to formulate a two-photon processable resin. Upon two-photon excitation, photogenerated electrons in the excited states of the carbon dots facilitate the free radical formation at the surface of the carbon dots. These radicals, upon interaction with vinyl moieties, enable cross-linking of acrylate monomers. Free-radical induced two-photon polymerization of acrylate monomers without any conventional proprietary two-photon absorbing materials was accomplished at an ultrafine subwavelength resolution of 250 nm using 800 nm laser excitation. The effect of critical parameters such as average laser power, carbon dot concentration, and radiation exposure were determined for the fabrication of one-, two-, and three-dimensional functional nanostructures, applicable in a range of domains where fluorescence and toxicity are of the utmost importance. A fabrication speed as high as 100 mm/s was achieved. The ability to fabricate functional 3D micro-/nanostructures is anticipated to instigate a paradigm shift in various areas such as metamaterials, energy storage, drug delivery, and optoelectronics to name a few.
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Affiliation(s)
- Arun Jaiswal
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India
| | - Sweta Rani
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay-Monash Research Academy, Mumbai 400076, Maharashtra, India
| | - Gaurav Pratap Singh
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India
| | - Mahbub Hassan
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Aklima Nasrin
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Vincent G Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, New South Wales 2006, Australia
- Nano Institute, The University of Sydney, Sydney, New South Wales 2006, Australia
| | - Sumit Saxena
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay-Monash Research Academy, Mumbai 400076, Maharashtra, India
| | - Shobha Shukla
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay, Mumbai 400076, Maharashtra, India
- Nanostructures Engineering and Modeling Laboratory, Department of Metallurgical Engineering and Materials Science, Indian Institute of Technology Bombay-Monash Research Academy, Mumbai 400076, Maharashtra, India
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Hoang VC, Shafaat A, Jankovskaja S, Gomes VG, Ruzgas T. Franz cells for facile biosensor evaluation: A case of HRP/SWCNT-based hydrogen peroxide detection via amperometric and wireless modes. Biosens Bioelectron 2021; 191:113420. [PMID: 34182432 DOI: 10.1016/j.bios.2021.113420] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2020] [Revised: 06/01/2021] [Accepted: 06/05/2021] [Indexed: 12/26/2022]
Abstract
Reducing animal use in biosensor research requires broader use of in vitro methods. In this work, we present a novel application of Franz cells suitable for biosensor development and evaluation in vitro. The work describes how Franz cell can be equipped with electrodes enabling characterization of biosensors in close proximity to skin. As an example of a sensor, hydrogen peroxide biosensor was prepared based on horseradish peroxidase (HRP)/single-walled carbon nanotube (SWCNT)-modified textile. The electrode exhibited lower detection limit of 0.3 μM and sensitivity of 184 μA mM-1 cm-2. The ability of this biosensor to monitor H2O2 penetration through skin and dialysis membranes was evaluated in Franz cell setup in amperometric and wireless modes. The results also show that catalase activity present in skin is a considerable problem for epidermal sensing of H2O2. This work highlights opportunities and obstacles that can be addressed by assessment of biosensors in Franz cell setup before progressing to their testing in animals and humans.
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Affiliation(s)
- Van Chinh Hoang
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, SE-205 06, Malmö, Sweden; Biofilms - Research Center for Biointerfaces, Malmö University, SE-205 06, Malmö, Sweden; The University of Sydney, School of Chemical and Biomolecular Engineering, NSW, 2006, Australia
| | - Atefeh Shafaat
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, SE-205 06, Malmö, Sweden; Biofilms - Research Center for Biointerfaces, Malmö University, SE-205 06, Malmö, Sweden
| | - Skaidre Jankovskaja
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, SE-205 06, Malmö, Sweden; Biofilms - Research Center for Biointerfaces, Malmö University, SE-205 06, Malmö, Sweden
| | - Vincent G Gomes
- The University of Sydney, School of Chemical and Biomolecular Engineering, NSW, 2006, Australia.
| | - Tautgirdas Ruzgas
- Department of Biomedical Science, Faculty of Health and Society, Malmö University, SE-205 06, Malmö, Sweden; Biofilms - Research Center for Biointerfaces, Malmö University, SE-205 06, Malmö, Sweden.
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Nasrin A, Hassan M, Gomes VG. Two-photon active nucleus-targeting carbon dots: enhanced ROS generation and photodynamic therapy for oral cancer. Nanoscale 2020; 12:20598-20603. [PMID: 33047748 DOI: 10.1039/d0nr05210h] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Novel conjugated carbon dots (CDs) were synthesized as two-photon active photosensitisers to unleash lethal reactive oxygen species (ROS) for nucleus-targeting photodynamic therapy (PDT). To enhance the therapeutic efficiency and preclude non-specific CD uptake, we employed a combination of folic acid and curcumin for two-photon NIR-triggered ROS generation and enhanced internalization in the nucleus. Consequently, enhanced destruction of cancer cells occurred by directly attacking the DNA. The intrinsic ROS generation and nucleus-targeting ability of CDs introduced multifunctional two-photon active nanoprobes within a single platform for enhanced PDT in oral cancer theranostics.
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Affiliation(s)
- Aklima Nasrin
- The University of Sydney, School of Chemical and Biomolecular Engineering, NSW 2006, Australia.
| | - Mahbub Hassan
- The University of Sydney, School of Chemical and Biomolecular Engineering, NSW 2006, Australia.
| | - Vincent G Gomes
- The University of Sydney, School of Chemical and Biomolecular Engineering, NSW 2006, Australia.
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Shabnam L, Faisal SN, Martucci A, Gomes VG. Non-enzymatic multispecies sensing of key wine attributes with nickel nanoparticles on N-doped graphene composite. J Solid State Electrochem 2019. [DOI: 10.1007/s10008-019-04455-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Ardekani SM, Dehghani A, Ye P, Nguyen KA, Gomes VG. Conjugated carbon quantum dots: Potent nano-antibiotic for intracellular pathogens. J Colloid Interface Sci 2019; 552:378-387. [DOI: 10.1016/j.jcis.2019.05.067] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 05/14/2019] [Accepted: 05/20/2019] [Indexed: 12/25/2022]
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Dave K, Gomes VG. Interactions at scaffold interfaces: Effect of surface chemistry, structural attributes and bioaffinity. Mater Sci Eng C Mater Biol Appl 2019; 105:110078. [PMID: 31546353 DOI: 10.1016/j.msec.2019.110078] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 08/12/2019] [Accepted: 08/12/2019] [Indexed: 01/01/2023]
Abstract
Effective regenerative medicine relies on understanding the interplay between biomaterial implants and the adjoining cells. Scaffolds contribute by presenting sites for cellular adhesion, growth, proliferation, migration, and differentiation which lead to regeneration of tissues over desired periods of time. The fabrication and recruitment of scaffolds often fail to consider the interactions that occur at the interfaces, thereby risking rejection. This lack of knowledge on interfacial microenvironments and related exchanges often causes reduced cellular interactions, poor cell survival and intervention failure. Successful regenerative therapy requires scaffolds with bespoke biocompatibility, optimum pore structure, and cues for cell attachments. These factors determine the development of cellular affinity in scaffolds. For biomedical applications, a detailed understanding of scaffolds and their interfaces is required for better tuning of biomaterials to suit the microenvironments. In this review, we discuss the role of biointerfaces with a focus on surface chemistry, pore structure, scaffold hydro-affinity and their biointeractions. An understanding of the effect of scaffold interfacial properties is crucial for enhancing the progress of tissue engineering towards clinical applications.
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Affiliation(s)
- Khyati Dave
- The University of Sydney, School of Chemical and Biomolecular Engineering, Sydney, NSW 2006, Australia
| | - Vincent G Gomes
- The University of Sydney, School of Chemical and Biomolecular Engineering, Sydney, NSW 2006, Australia.
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Hoang VC, Gomes VG, Dinh KN. Ni- and P-doped carbon from waste biomass: A sustainable multifunctional electrode for oxygen reduction, oxygen evolution and hydrogen evolution reactions. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.05.053] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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12
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Hoang VC, Nguyen LH, Gomes VG. High efficiency supercapacitor derived from biomass based carbon dots and reduced graphene oxide composite. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2018.10.050] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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13
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Gomes VG, Ahmadi M. Greenhouse gas removal from industrial effluents: The role of inorganic additives. CAN J CHEM ENG 2018. [DOI: 10.1002/cjce.23376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Vincent G. Gomes
- School of Chemical and Biomolecular EngineeringThe University of SydneySydneyNSW 2006Australia
| | - Mitra Ahmadi
- School of Chemical and Biomolecular EngineeringThe University of SydneySydneyNSW 2006Australia
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Shabnam L, Faisal SN, Roy AK, Gomes VG. Nickel-Nanoparticles on Doped Graphene: A Highly Active Electrocatalyst for Alcohol and Carbohydrate Electrooxidation for Energy Production. ChemElectroChem 2018. [DOI: 10.1002/celc.201800818] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Luba Shabnam
- The University of Sydney; School of Chemical & Biomolecular Engineering; NSW 2006 Australia
| | - Shaikh N. Faisal
- The University of Sydney; School of Chemical & Biomolecular Engineering; NSW 2006 Australia
| | - Anup K. Roy
- The University of Sydney; School of Chemical & Biomolecular Engineering; NSW 2006 Australia
| | - Vincent G. Gomes
- The University of Sydney; School of Chemical & Biomolecular Engineering; NSW 2006 Australia
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Dehghani A, Madadi Ardekani S, Lesani P, Hassan M, Gomes VG. Two-Photon Active Boron Nitride Quantum Dots for Multiplexed Imaging, Intracellular Ferric Ion Biosensing, and pH Tracking in Living Cells. ACS Appl Bio Mater 2018; 1:975-984. [DOI: 10.1021/acsabm.8b00145] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alireza Dehghani
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Sara Madadi Ardekani
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Pooria Lesani
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Mahbub Hassan
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Vincent G. Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW 2006, Australia
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Shabnam L, Faisal SN, Roy AK, Haque E, Minett AI, Gomes VG. Doped graphene/Cu nanocomposite: A high sensitivity non-enzymatic glucose sensor for food. Food Chem 2017; 221:751-759. [DOI: 10.1016/j.foodchem.2016.11.107] [Citation(s) in RCA: 76] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 08/02/2016] [Accepted: 11/21/2016] [Indexed: 10/20/2022]
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Shabnam L, Faisal SN, Roy AK, Minett AI, Gomes VG. Nonenzymatic multispecies sensor based on Cu-Ni nanoparticle dispersion on doped graphene. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2016.12.056] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Hassan M, Haque E, Minett AI, Gomes VG. Co-Doping of Activated Graphene for Synergistically Enhanced Electrocatalytic Oxygen Reduction Reaction. ChemSusChem 2015; 8:4040-4048. [PMID: 26564337 DOI: 10.1002/cssc.201501016] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 09/25/2015] [Indexed: 06/05/2023]
Abstract
Doping of graphene has emerged as a key strategy to improve the electrocatalytic performance of the oxygen reduction reaction (ORR). Activated graphene co-doped with iodine and nitrogen atoms (NIG) was developed in this work using a facile scalable approach. The onset potential, current density, and four-electron reduction pathway of the newly developed catalyst were significantly improved. The charge-transfer resistance of co-doped NIG was found to be much lower than nitrogen-doped graphene (NG); furthermore, the stability of NIG and its resistance to methanol crossover were also improved. The synergistically enhanced ORR performance of NIG was found to be a result of a high strain and size advantage of the larger iodine atom clusters (compared to nitrogen), which facilitate the simultaneous enrichment of anode electrons and O2 and H2 O molecule transport at catalytic sites, inducing four-electron transfer in a single step. These results are promising for application in alkaline fuel cells.
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Affiliation(s)
- Mahbub Hassan
- Integrated Polymer and Systems Engineering Group, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia), Fax: (+61) 293512854
| | - Enamul Haque
- Integrated Polymer and Systems Engineering Group, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia), Fax: (+61) 293512854
| | - Andrew I Minett
- Laboratory for Sustainable Technology, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia
| | - Vincent G Gomes
- Integrated Polymer and Systems Engineering Group, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW, 2006, Australia), Fax: (+61) 293512854.
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Sairi F, Valtchev P, Gomes VG, Dehghani F. Distribution and characterization of rhogocyte cell types in the mantle tissue of Haliotis laevigata. Mar Biotechnol (NY) 2015; 17:168-179. [PMID: 25382219 DOI: 10.1007/s10126-014-9605-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 09/29/2014] [Indexed: 06/04/2023]
Abstract
Molluscan rhogocytes are known to be the only cells able to synthesize hemocyanin that is one of the largest respiratory proteins in nature. However, investigation of rhogocyte cells in vitro is limited due to difficulty in isolating and establishing marine cell culture. The aim of this study was to investigate the nature and distribution of rhogocyte cells of Haliotis laevigata in the mantle tissue with respect to the expression of the two known isoforms of hemocyanin. Rhogocyte cells were identified using immunofluorescence-fluorescence in situ hybridization (IF-FISH) that involved simultaneous staining of localized hemocyanin by a polyclonal antibody while the mRNA was hybridized with FISH probes. The distribution of rhogocyte cells was demonstrated using flow cytometry, followed by cell sorting with fluorescence-activated cell sorter (FACS) and confocal microscope imaging for further characterization. Our results suggested that the mantle tissue is dominated by two distinct populations of rhogocyte cells that synthesize hemocyanin type 1. Observation with confocal microscopy of both populations revealed hemocyanin localization in the periphery of the cell membrane. Cell population with higher antibody signal had irregular and elongated cell morphology with punctate mRNA probe signals. The second population with lower antibody signal had ovoid morphology and wide distribution of mRNA probe signals. We suggest that these populations represent two distinct phases of hemocyanin biosynthesis of a single isoform, which is closely related to Haliotis tuberculata type 1 hemocyanin (HtH1). The knowledge acquired in this study enhances the understanding of the biology of rhogocyte cells and biosynthesis of hemocyanin.
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Affiliation(s)
- Fareed Sairi
- School of Chemical and Biomolecular Engineering, University of Sydney, Sydney, 2006, Australia
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Noeiaghaei T, Yun JH, Nam SW, Zoh KD, Gomes VG, Kim JO, Chae SR. The influence of geometrical characteristics on the photocatalytic activity of TiO2 nanotube arrays for degradation of refractory organic pollutants in wastewater. Water Sci Technol 2015; 71:1301-1309. [PMID: 25945845 DOI: 10.2166/wst.2015.078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The effects of geometrical characteristics such as surface area (SA) and porosity of TiO2 nanotube arrays (TNAs) on its photocatalytic activity were investigated by applying variable voltages and reaction times for the anodization of Ti substrates. While larger SA of nanotubes was observed under higher applied potential, the porosity of TNAs decreased by increasing anodizing voltage. Under applied potential of 80 V, the SA of TNAs increased from 0.164 to 0.471 m2/g as anodization time increased from 1 to 5 hours, respectively. However, no significant effect on the porosity of TNAs was observed. On the other hand, both SA and porosity of TNAs, synthesized at 60 V, increased by augmenting the anodization time from 1 to 3 hours. But further increasing of anodization time to 5 hours resulted in a decreased SA of TNAs with no effect on their porosity. Accordingly, the TNAs with SA of 0.368 m2/g and porosity of 47% showed the highest photocatalytic activity for degradation of 4-chlorobenzoic acid (4CBA). Finally, the degradation of refractory model compounds such as carbamazepine and bisphenol-A was tested and more than 50% of both compounds could be degraded under UV-A irradiation (λmax=365 nm).
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Affiliation(s)
- T Noeiaghaei
- School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
| | - J-H Yun
- Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, Queensland 4072, Australia
| | - S W Nam
- Department of Environmental Health, School of Public Health, Seoul National University, Seoul 151-742, South Korea
| | - K D Zoh
- Department of Environmental Health, School of Public Health, Seoul National University, Seoul 151-742, South Korea
| | - V G Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
| | - J O Kim
- Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 133-792, Republic of Korea
| | - S R Chae
- Department of Biomedical, Chemical, and Environmental Engineering, 701 Engineering Research Center, University of Cincinnati, Cincinnati, Ohio 45221-0012, USA E-mail:
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Haque E, Islam MM, Pourazadi E, Hassan M, Faisal SN, Roy AK, Konstantinov K, Harris AT, Minett AI, Gomes VG. Nitrogen doped graphene via thermal treatment of composite solid precursors as a high performance supercapacitor. RSC Adv 2015. [DOI: 10.1039/c4ra17262k] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nitrogen-doped graphene from solid precursors exhibited capacitance values greater than those of GO and graphene by factors of six and two, respectively.
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Affiliation(s)
- Enamul Haque
- Integrated Polymer and Systems Engineering Group
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | - Md. Monirul Islam
- Institute for Superconducting and Electronic Materials
- University of Wollongong
- Australia
| | - Ehsan Pourazadi
- Laboratory for Sustainable Technology
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | - Mahbub Hassan
- Integrated Polymer and Systems Engineering Group
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | - Shaikh Nayeem Faisal
- Laboratory for Sustainable Technology
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | - Anup Kumar Roy
- Laboratory for Sustainable Technology
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | | | - Andrew T. Harris
- Laboratory for Sustainable Technology
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | - Andrew I. Minett
- Laboratory for Sustainable Technology
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
| | - Vincent G. Gomes
- Integrated Polymer and Systems Engineering Group
- School of Chemical & Biomolecular Engineering
- The University of Sydney
- Australia
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Abdollahi Z, Darestani MT, Ghasemi S, Gomes VG. Monitoring inverse-phase emulsion polymerization using electrical impedance spectroscopy. POLYM INT 2014. [DOI: 10.1002/pi.4853] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Zohreh Abdollahi
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
| | - Mariam T Darestani
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
| | - Samira Ghasemi
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
| | - Vincent G Gomes
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
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Hassan M, Haque E, Reddy KR, Minett AI, Chen J, Gomes VG. Edge-enriched graphene quantum dots for enhanced photo-luminescence and supercapacitance. Nanoscale 2014; 6:11988-11994. [PMID: 25178096 DOI: 10.1039/c4nr02365j] [Citation(s) in RCA: 165] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Graphene quantum dots (GQDs) with their edge-bound nanometer-size present distinctive properties owing to quantum confinement and edge effects. We report a facile ultrasonic approach with chemical activation using KOH to prepare activated GQDs or aGQDs enriched with both free and bound edges. Compared to GQDs, the aGQDs we synthesized had enhanced BET surface area by a factor of about six, the photoluminescence intensity by about four and half times and electro-capacitance by a factor of about two. Unlike their non-activated counterparts, the aGQDs having enhanced edge states emit enhanced intense blue luminescence and exhibit electrochemical double layer capacitance greater than that of graphene, activated or not. Apart from their use as part of electrodes in a supercapacitor, the superior luminescence of aGQDs holds potential for use in biomedical imaging and related optoelectronic applications.
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Affiliation(s)
- Mahbub Hassan
- Integrated Polymer and Systems Engineering Group, School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia.
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Affiliation(s)
- Samira Ghasemi
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
| | - Mariam T. Darestani
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
| | - Zohreh Abdollahi
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
| | - Vincent G. Gomes
- School of Chemical and Biomolecular Engineering; University of Sydney; NSW 2006 Australia
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Altarawneh I, Rawadieh S, Gomes VG. The influence of intermediate radical termination and fragmentation on controlled polymer synthesis via RAFT polymerization. Des Monomers Polym 2014. [DOI: 10.1080/15685551.2013.867566] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Affiliation(s)
- Ibrahem Altarawneh
- Department of Chemical Engineering, Alhussein Bin Talal University, Ma'an, Jordan
| | - Saleh Rawadieh
- Department of Chemical Engineering, Alhussein Bin Talal University, Ma'an, Jordan
| | - Vincent G. Gomes
- School of Chemical & Biomolecular Engineering, The University of Sydney, Sydney, Australia
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Abdollahi Z, Darestani MT, Ghasemi S, Gomes VG. Characterizing colloidal behavior of non-ionic emulsifiers in non-polar solvents using electrical impedance spectroscopy. Colloid Polym Sci 2014. [DOI: 10.1007/s00396-014-3318-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Rawadieh S, Gomes VG, Altarawneh I. Optimizing packing heterogeneity for sorption enhanced metathesis reaction. ADSORPTION 2014. [DOI: 10.1007/s10450-014-9614-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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29
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Affiliation(s)
- Cynthia Tjiam
- School of Chemical and Biomolecular Engineering, The University of Sydney, New South Wales 2006, Australia
| | - Vincent G. Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, New South Wales 2006, Australia
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Ghasemi S, Darestani MT, Abdollahi Z, Hawkett BS, Gomes VG. Electrical impedance spectroscopy for determining critical micelle concentration of ionic emulsifiers. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.09.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Zanjani NT, Sairi F, Marshall G, Saksena MM, Valtchev P, Gomes VG, Cunningham AL, Dehghani F. Formulation of abalone hemocyanin with high antiviral activity and stability. Eur J Pharm Sci 2013; 53:77-85. [PMID: 24275606 DOI: 10.1016/j.ejps.2013.11.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Revised: 11/04/2013] [Accepted: 11/13/2013] [Indexed: 10/26/2022]
Abstract
Hemocyanin has been shown to have potential antiviral activity against herpes simplex virus type-1. However, current liquid formulations have short shelf life and high risk of bacterial contamination. The aim of our study was to develop a stable functional formulation. Analytical techniques (nano-differential scanning calorimetry and spectroscopy) and biological assays (cytotoxicity and plaque reduction) were employed to measure the effect of sugar addition on the physical properties and shelf life of the solid formulated hemocyanin. Sucrose improved thermal stability significantly by both increasing the aggregation onset temperature (70°C to>78 °C) and enhancing the activation energy (18%). Lyophilisation without trehalose caused degradation and unfolding of the α-helices of hemocyanin. However, the addition of an optimal proportion of trehalose:protein (5:1 by weight) prevented the degradation and unfolding during lyophilisation, hence maintained the protein solubility. The estimated ED50 values of the formulated solid (0.43±0.1) and liquid samples (0.37±0.06) were similar in magnitude, and were significantly lower than the respective controls; thus, confirming enhanced antiviral activity of the formulation. Formulated compounds were stable for six months at 5 °C storage. The enhanced shelf life and stable antiviral activity of the formulation offers its significant potential as effective therapeutic agent in future clinical applications.
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Affiliation(s)
- Negar Talaei Zanjani
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia
| | - Fareed Sairi
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia
| | - Gavin Marshall
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia
| | - Monica Miranda Saksena
- Centre for Virus Research, Westmead Millennium Institute, Westmead, Sydney, NSW, Australia
| | - Peter Valtchev
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia
| | - Vincent G Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia
| | - Anthony L Cunningham
- Centre for Virus Research, Westmead Millennium Institute, Westmead, Sydney, NSW, Australia
| | - Fariba Dehghani
- School of Chemical and Biomolecular Engineering, The University of Sydney, Sydney, NSW, Australia.
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Tjiam C, Gomes VG. Online Inferential Measurement of Conversion and Molar Mass in Emulsion Polymerization Controlled by Chain Transfer. Ind Eng Chem Res 2011. [DOI: 10.1021/ie200598m] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cynthia Tjiam
- School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
| | - Vincent G. Gomes
- School of Chemical and Biomolecular Engineering, The University of Sydney, NSW 2006, Australia
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Jung SM, Gomes VG. Miniemulsion Polymerisation Via Reversible Addition Fragmentation Chain Transfer in Pseudo-Bulk Regime. MACROMOL REACT ENG 2011. [DOI: 10.1002/mren.201100018] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Altarawneh IS, Gomes VG, Srour MH. Polymer chain extension in semibatch emulsion polymerization with RAFT-based transfer agent: The influence of reaction conditions on polymerization rate and product properties. J Appl Polym Sci 2009. [DOI: 10.1002/app.30752] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Altarawneh IS, Gomes VG, Srour MH. Online polymer molecular weight and conversion monitoring via calorimetric measurements in RAFT emulsion polymerization. POLYM INT 2009. [DOI: 10.1002/pi.2678] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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37
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Rawadieh S, Gomes VG. Adsorptive separation in the enhancement of butene dehydrogenation. ADSORPTION 2009. [DOI: 10.1007/s10450-009-9187-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Altarawneh IS, Gomes VG, Srour MS. The Influence of Xanthate-Based Transfer Agents on Styrene Emulsion Polymerization: Mathematical Modeling and Model Validation. MACROMOL REACT ENG 2008. [DOI: 10.1002/mren.200700030] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Alhamad B, Romagnoli JA, Gomes VG. On-line multi-variable predictive control of molar mass and particle size distributions in free-radical emulsion copolymerization. Chem Eng Sci 2005. [DOI: 10.1016/j.ces.2005.05.053] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Elgebrandt RC, Romagnoli JA, Fletcher DF, Gomes VG, Gilbert RG. Analysis of shear-induced coagulation in an emulsion polymerisation reactor using computational fluid dynamics. Chem Eng Sci 2005. [DOI: 10.1016/j.ces.2004.12.010] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Hayashi J, Yamamoto N, Horikawa T, Muroyama K, Gomes VG. Preparation and characterization of high-specific-surface-area activated carbons from K2CO3-treated waste polyurethane. J Colloid Interface Sci 2005; 281:437-43. [PMID: 15571700 DOI: 10.1016/j.jcis.2004.08.092] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Accepted: 08/11/2004] [Indexed: 11/25/2022]
Abstract
An activated carbon with high specific surface area was prepared from polyurethane foam by chemical activation with K2CO3 and the influences of carbonization temperature and impregnation ratio on the pore structure of the prepared activated carbon were investigated. It was found that the specific surface area of the activated carbon was at a maximum value (about 2800 m(2)/g) at a carbonization temperature of 1073 K and at an impregnation ratio of 1.0. It was concluded that the polyurethane foam structure was modified during impregnation by K2CO3, K2CO3 promoted charring during carbonization, and then the weight loss behavior was changed below 700 and above 1000 K, carbon in the char was consumed by K2CO3 reduction, and this led to the high specific surface area. The prepared activated carbon had a very sharp micropore size distribution, compared with the commercial activated carbon having high specific surface area. The amounts of three organic vapors (benzene, acetone, and octane) adsorbed on the prepared activated carbons was much larger than those on the traditional coconut shell AC and the same as those on the commercial activated carbon except for octane. We surmised that the high specific surface area was due to the modification of the carbonization behavior of polyurethane foam by K2CO3.
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Affiliation(s)
- J Hayashi
- Department of Chemical Engineering, Kansai University, Suita, Osaka 564-8680, Japan.
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Affiliation(s)
- Stuart Ngai
- Department of Chemical Engineering, University of Sydney, Sydney, NSW 2006, Australia
| | - Vincent G. Gomes
- Department of Chemical Engineering, University of Sydney, Sydney, NSW 2006, Australia
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49
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Gomes VG. Comments on "Moisture desorption in cellulosic materials". Ind Eng Chem Res 1993. [DOI: 10.1021/ie00020a040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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