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Zhao Z, Balu R, Gangadoo S, Duta NK, Choudhury NR. Poly(butylene adipate-co-terephthalate)/Polylactic Acid/Tetrapod-Zinc Oxide Whisker Composite Films with Antibacterial Properties. Polymers (Basel) 2024; 16:1039. [PMID: 38674959 PMCID: PMC11055077 DOI: 10.3390/polym16081039] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Revised: 04/02/2024] [Accepted: 04/05/2024] [Indexed: 04/28/2024] Open
Abstract
Biodegradable composite films comprising of poly(butylene adipate-co-terephthalate) (PBAT), polylactic acid (PLA), and tetrapod-zinc oxide (T-ZnO) whisker were prepared by a melt-extrusion and blow molding process. The effect of the incorporation of the T-ZnO whisker (1 to 7 wt.%) in the PBAT/PLA blend film was studied systematically. The composite films with an optimal T-ZnO whisker concentration of 3 wt.% exhibited the highest mechanical (tensile strength ~32 MPa), rheological (complex viscosity~1200 Pa.s at 1 rad/s angular frequency), and gas barrier (oxygen permeability~20 cc/m2·day) properties, whereas the composite films with 7 wt.% T-ZnO whiskers exhibited the highest antibacterial properties. The developed composite films can find potential application as antibacterial food packaging materials.
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Affiliation(s)
- Zhibo Zhao
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; (Z.Z.); (R.B.); (S.G.)
| | - Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; (Z.Z.); (R.B.); (S.G.)
- ARC Industrial Transformation Research Hub for Transformation of Reclaimed Waste into Engineered Materials and Solutions for a Circular Economy (TREMS), RMIT University, Melbourne, VIC 3000, Australia
| | - Sheeana Gangadoo
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; (Z.Z.); (R.B.); (S.G.)
| | - Naba Kumar Duta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; (Z.Z.); (R.B.); (S.G.)
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; (Z.Z.); (R.B.); (S.G.)
- ARC Industrial Transformation Research Hub for Transformation of Reclaimed Waste into Engineered Materials and Solutions for a Circular Economy (TREMS), RMIT University, Melbourne, VIC 3000, Australia
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2
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Alshehhi JRMH, Wanasingha N, Balu R, Mata J, Shah K, Dutta NK, Choudhury NR. 3D-Printable Sustainable Bioplastics from Gluten and Keratin. Gels 2024; 10:136. [PMID: 38391466 PMCID: PMC10887891 DOI: 10.3390/gels10020136] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/26/2024] [Accepted: 01/30/2024] [Indexed: 02/24/2024] Open
Abstract
Bioplastic films comprising both plant- and animal-derived proteins have the potential to integrate the optimal characteristics inherent to the specific domain, which offers enormous potential to develop polymer alternatives to petroleum-based plastic. Herein, we present a facile strategy to develop hybrid films comprised of both wheat gluten and wool keratin proteins for the first time, employing a ruthenium-based photocrosslinking strategy. This approach addresses the demand for sustainable materials, reducing the environmental impact by using proteins from renewable and biodegradable sources. Gluten film was fabricated from an alcohol-water mixture soluble fraction, largely comprised of gliadin proteins. Co-crosslinking hydrolyzed low-molecular-weight keratin with gluten enhanced its hydrophilic properties and enabled the tuning of its physicochemical properties. Furthermore, the hierarchical structure of the fabricated films was studied using neutron scattering techniques, which revealed the presence of both hydrophobic and hydrophilic nanodomains, gliadin nanoclusters, and interconnected micropores in the matrix. The films exhibited a largely (>40%) β-sheet secondary structure, with diminishing gliadin aggregate intensity and increasing micropore size (from 1.2 to 2.2 µm) with an increase in keratin content. The hybrid films displayed improved molecular chain mobility, as evidenced by the decrease in the glass-transition temperature from ~179.7 °C to ~173.5 °C. Amongst the fabricated films, the G14K6 hybrid sample showed superior water uptake (6.80% after 30 days) compared to the pristine G20 sample (1.04%). The suitability of the developed system for multilayer 3D printing has also been demonstrated, with the 10-layer 3D-printed film exhibiting >92% accuracy, which has the potential for use in packaging, agricultural, and biomedical applications.
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Affiliation(s)
| | - Nisal Wanasingha
- Chemical and Environmental Engineering, School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia
| | - Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia
| | - Jitendra Mata
- Australian Centre for Neutron Scattering (ACNS), Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW 2232, Australia
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | - Kalpit Shah
- Chemical and Environmental Engineering, School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia
| | - Naba K Dutta
- Chemical and Environmental Engineering, School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia
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3
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Li N, Hou J, Ou R, Yeo L, Choudhury NR, Zhang H. Stimuli-Responsive Ion Adsorbents for Sustainable Separation Applications. ACS Nano 2023; 17:17699-17720. [PMID: 37695744 DOI: 10.1021/acsnano.3c04942] [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: 09/13/2023]
Abstract
Stimuli-responsive ion absorbents (SRIAs) with reversible ion adsorption and desorption properties have recently attracted immense attention due to their outstanding functionalities for sustainable separation applications. Over the past decade, a series of SRIAs that respond to single or multiple external stimuli (e.g., pH, gas, temperature, light, magnetic, and voltage) have been reported to achieve excellent ion adsorption capacity and selectivity while simultaneously allowing for their reusability. In contrast to traditional adsorbents that are mainly regenerated through chemical additives, SRIAs allow for reduced chemical and even chemical-free regeneration capacities, thereby enabling environmentally friendly and energy-efficient separation technologies. In this review, we systematically summarize the materials and strategies reported to date for synthesizing single-, dual-, and multiresponsive ion adsorbents. Following a discourse on the fundamental mechanisms that govern their adsorption and desorption under various external stimuli, we provide a concise discussion of the regeneration capacity and application of these responsive ion adsorbents for sustainable water desalination, toxic ion removal, and valuable ion extract and recovery. Finally, we discuss the challenges in developing and deploying these promising multifunctional responsive ion adsorbents together with strategies to overcome these limitations and provide prospects for their future.
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Affiliation(s)
- Nicole Li
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Jue Hou
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Ranwen Ou
- College of the Environment and Ecology, Xiamen University, Xiamen 361102, PR China
| | - Leslie Yeo
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Huacheng Zhang
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
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4
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Siddique T, Gangadoo S, Quang Pham D, Dutta NK, Choudhury NR. Antifouling and Antimicrobial Study of Nanostructured Mixed-Matrix Membranes for Arsenic Filtration. Nanomaterials (Basel) 2023; 13:nano13040738. [PMID: 36839105 PMCID: PMC9964044 DOI: 10.3390/nano13040738] [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] [Received: 12/15/2022] [Revised: 01/24/2023] [Accepted: 02/01/2023] [Indexed: 05/08/2023]
Abstract
Membrane fouling is a major drawback in the membrane filtration industry for water treatment. Mixed-matrix membranes (MMMs) are well known for their enhanced antifouling and antibacterial properties, which could offer potential benefits for membrane filtration processes in the water treatment field. In this work, three electrospun nanofibrous MMMs (P, CP, and MCP, which were, respectively, the pristine polysulfone membrane and mixed-matrix membranes (MMMs) consisting of GO-ZnO and GO-ZnO-iron oxides) were studied for antifouling and antibacterial properties with respect to the arsenic nanofiltration process. The effects of these composites on the antifouling behaviour of the membranes were studied by characterising the bovine serum albumin (BSA) protein adsorption on the membranes and subsequent analysis using microscopic (morphology via scanning electron microscopy) and Brunauer-Emmett-Teller (BET) analyses. The antibacterial properties of these membranes were also studied against Gram-positive Staphylococcus aureus (S. aureus) and Gram-negative Escherichia coli (E. coli). The composite nanoparticle-incorporated membranes showed improved antifouling properties in comparison with the pristine polysulfone (PSF) membrane. The excellent antimicrobial properties of these membranes make them appropriate candidates to contribute to or overcome biofouling issues in water or wastewater treatment applications.
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Affiliation(s)
- Tawsif Siddique
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Sheeana Gangadoo
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Duy Quang Pham
- College of Medicine and Public Health, Flinders University, Sturt Road, Bedford Park, SA 5042, Australia
| | - Naba K. Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
- Correspondence: (N.K.D.); (N.R.C.)
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
- Correspondence: (N.K.D.); (N.R.C.)
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5
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Balu R, Wanasingha N, Mata JP, Rekas A, Barrett S, Dumsday G, Thornton AW, Hill AJ, Roy Choudhury N, Dutta NK. Crowder-directed interactions and conformational dynamics in multistimuli-responsive intrinsically disordered protein. Sci Adv 2022; 8:eabq2202. [PMID: 36542701 PMCID: PMC9770960 DOI: 10.1126/sciadv.abq2202] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 11/17/2022] [Indexed: 06/17/2023]
Abstract
The consequences of crowding on the dynamic conformational ensembles of intrinsically disordered proteins (IDPs) remain unresolved because of their ultrafast motion. Here, we report crowder-induced interactions and conformational dynamics of a prototypical multistimuli-responsive IDP, Rec1-resilin. The effects of a range of crowders of varying sizes, forms, topologies, and concentrations were examined using spectroscopic, spectrofluorimetric, and contrast-matching small- and ultrasmall-angle neutron scattering investigation. To achieve sufficient neutron contrast against the crowders, deuterium-labeled Rec1-resilin was biosynthesized successfully. Moreover, the ab initio "shape reconstruction" approach was used to obtain three-dimensional models of the conformational assemblies. The IDP revealed crowder-specific systematic extension and compaction with the level of macromolecular crowding. Last, a robust extension-contraction model has been postulated to capture the fundamental phenomena governing the observed behavior of IDPs. The study provides insights and fresh perspectives for understanding the interactions and structural dynamics of IDPs in crowded states.
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Affiliation(s)
- Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Nisal Wanasingha
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Jitendra P. Mata
- Australian Center for Neutron Scattering, ANSTO, Lucas Heights, NSW 2234, Australia
| | - Agata Rekas
- National Deuteration Facility, ANSTO, Lucas Heights, NSW 2234, Australia
| | - Susan Barrett
- CSIRO Manufacturing, Bayview Avenue, Clayton, VIC 3168, Australia
| | - Geoff Dumsday
- CSIRO Manufacturing, Bayview Avenue, Clayton, VIC 3168, Australia
| | | | - Anita J. Hill
- CSIRO Manufacturing, Bayview Avenue, Clayton, VIC 3168, Australia
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Naba K. Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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6
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Tran TS, Balu R, Mettu S, Roy Choudhury N, Dutta NK. 4D Printing of Hydrogels: Innovation in Material Design and Emerging Smart Systems for Drug Delivery. Pharmaceuticals (Basel) 2022; 15:ph15101282. [PMID: 36297394 PMCID: PMC9609121 DOI: 10.3390/ph15101282] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 10/12/2022] [Accepted: 10/13/2022] [Indexed: 11/23/2022] Open
Abstract
Advancements in the material design of smart hydrogels have transformed the way therapeutic agents are encapsulated and released in biological environments. On the other hand, the expeditious development of 3D printing technologies has revolutionized the fabrication of hydrogel systems for biomedical applications. By combining these two aspects, 4D printing (i.e., 3D printing of smart hydrogels) has emerged as a new promising platform for the development of novel controlled drug delivery systems that can adapt and mimic natural physio-mechanical changes over time. This allows printed objects to transform from static to dynamic in response to various physiological and chemical interactions, meeting the needs of the healthcare industry. In this review, we provide an overview of innovation in material design for smart hydrogel systems, current technical approaches toward 4D printing, and emerging 4D printed novel structures for drug delivery applications. Finally, we discuss the existing challenges in 4D printing hydrogels for drug delivery and their prospects.
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7
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Shiva Prasad N, Babarao R, Madapusi S, Sridhar S, Choudhury NR, Bhargava SK. Residual solvent induced physical morphology and gas permeation in polyamide-imide membrane: Experimental investigation and molecular simulations. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111012] [Citation(s) in RCA: 1] [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: 11/04/2022]
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8
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Wanasingha N, Dutta NK, Choudhury NR. Emerging bioadhesives: from traditional bioactive and bioinert to a new biomimetic protein-based approach. Adv Colloid Interface Sci 2021; 296:102521. [PMID: 34534751 DOI: 10.1016/j.cis.2021.102521] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 09/04/2021] [Accepted: 09/04/2021] [Indexed: 12/29/2022]
Abstract
Bioadhesives have reached significant milestones over the past two decades. Research has shown not only to produce adhesives capable of adhering to dry tissue but recently wet tissue as well. However, most bioadhesives developed have exhibited high adhesion strength yet lack other properties required for versatility in application, such as elasticity, biocompatibility and biodegradability. Adapting from limitations met from early bioadhesives and meeting the current demand allows novel bioadhesives to reach new milestones for the future. In this review, we overview the progression and variations of bioadhesives, current trends, characterisation techniques and conclude with future perspectives for bioadhesives for tissue engineering applications.
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Affiliation(s)
- Nisal Wanasingha
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Naba K Dutta
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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9
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Wanasingha N, Dorishetty P, Dutta NK, Choudhury NR. Polyelectrolyte Gels: Fundamentals, Fabrication and Applications. Gels 2021; 7:148. [PMID: 34563034 PMCID: PMC8482214 DOI: 10.3390/gels7030148] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/07/2021] [Accepted: 09/09/2021] [Indexed: 12/22/2022] Open
Abstract
Polyelectrolyte gels are an important class of polymer gels and a versatile platform with charged polymer networks with ionisable groups. They have drawn significant recent attention as a class of smart material and have demonstrated potential for a variety of applications. This review begins with the fundamentals of polyelectrolyte gels, which encompass various classifications (i.e., origin, charge, shape) and crucial aspects (ionic conductivity and stimuli responsiveness). It further centralises recent developments of polyelectrolyte gels, emphasising their synthesis, structure-property relationships and responsive properties. Sequentially, this review demonstrates how polyelectrolyte gels' flourishing properties create attractiveness to a range of applications including tissue engineering, drug delivery, actuators and bioelectronics. Finally, the review outlines the indisputable appeal, further improvements and emerging trends in polyelectrolyte gels.
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Affiliation(s)
| | | | - Naba K. Dutta
- School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia; (N.W.); (P.D.)
| | - Namita Roy Choudhury
- School of Engineering, STEM College, RMIT University, Melbourne, VIC 3000, Australia; (N.W.); (P.D.)
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10
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Dorishetty P, Balu R, Gelmi A, Mata JP, Dutta NK, Choudhury NR. 3D Printable Soy/Silk Hybrid Hydrogels for Tissue Engineering Applications. Biomacromolecules 2021; 22:3668-3678. [PMID: 34460237 DOI: 10.1021/acs.biomac.1c00250] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The development of protein-based 3D printable hydrogel systems with tunable structure and properties is a critical challenge in contemporary biomedicine. Particularly, 3D printing of modular hydrogels comprising different types of protein tertiary structure, such as globular and fibrous, has not yet been achieved. Here we report the extrusion-based 3D printing of hybrid hydrogels photochemically co-cross-linked between globular soy protein isolate (SPI) and fibrous silk fibroin (SF) for the first time. The hierarchical structure and organization of pristine SPI and SF, and 1:3 (SPI/SF) hybrid inks under various shear stress were investigated using in situ rheology combined with small-/ultra-small-angle neutron scattering (Rheo-SANS/USANS). The hybrid ink exhibited an isotropic mass fractal structure that was stable between tested shear rates of 0.1 and 100 s-1 (near printing shear). The kinetics of sol-gel transition during the photo-cross-linking reaction and the micromechanical properties of fabricated hydrogels were investigated using photorheology and atomic force microscopy, where the hybrid hydrogels exhibited tunable storage and Young's moduli in the range of 13-29 and 214-811 kPa, respectively. The cross-link density and printing accuracy of hybrid hydrogels and inks were observed to increase with the increase in SF content. The 3D printed hybrid hydrogels exhibited a micropore size larger than that of solution casted hydrogels; where the 3D printed 1:3 (SPI/SF) hybrid hydrogel showed a pore size about 7.6 times higher than that of the casted hydrogel. Moreover, the fabricated hybrid hydrogels exhibit good mouse fibroblast cell attachment, viability, and proliferation, demonstrating their potential for tissue engineering applications.
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Affiliation(s)
- Pramod Dorishetty
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Rajkamal Balu
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Amy Gelmi
- School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Jitendra P Mata
- Australian Centre for Neutron Scattering (ACNS), Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, Sydney, NSW 2232, Australia
| | - Naba K Dutta
- School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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11
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Siddique T, Dutta NK, Choudhury NR. Mixed-Matrix Membrane Fabrication for Water Treatment. Membranes (Basel) 2021; 11:557. [PMID: 34436320 PMCID: PMC8402158 DOI: 10.3390/membranes11080557] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 07/10/2021] [Accepted: 07/16/2021] [Indexed: 11/21/2022]
Abstract
In recent years, technology for the fabrication of mixed-matrix membranes has received significant research interest due to the widespread use of mixed-matrix membranes (MMMs) for various separation processes, as well as biomedical applications. MMMs possess a wide range of properties, including selectivity, good permeability of desired liquid or gas, antifouling behavior, and desired mechanical strength, which makes them preferable for research nowadays. However, these properties of MMMs are due to their tailored and designed structure, which is possible due to a fabrication process with controlled fabrication parameters and a choice of appropriate materials, such as a polymer matrix with dispersed nanoparticulates based on a typical application. Therefore, several conventional fabrication methods such as a phase-inversion process, interfacial polymerization, co-casting, coating, electrospinning, etc., have been implemented for MMM preparation, and there is a drive for continuous modification of advanced, easy, and economic MMM fabrication technology for industrial-, small-, and bulk-scale production. This review focuses on different MMM fabrication processes and the importance of various parameter controls and membrane efficiency, as well as tackling membrane fouling with the use of nanomaterials in MMMs. Finally, future challenges and outlooks are highlighted.
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Affiliation(s)
| | - Naba K. Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; or
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia; or
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12
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Rahman MM, Balu R, Abraham A, Dutta NK, Choudhury NR. Engineering a Bioactive Hybrid Coating for In Vitro Corrosion Control of Magnesium and Its Alloy. ACS Appl Bio Mater 2021; 4:5542-5555. [PMID: 35006741 DOI: 10.1021/acsabm.1c00366] [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] [Indexed: 12/21/2022]
Abstract
Magnesium (Mg) and its alloys are promising biodegradable metallic implant materials. However, their clinical applications are limited by their fast corrosion rate in the biological environment. In this work, with an outlook to improve the in vitro corrosion resistance of Mg and WE43 Mg alloy, a layer-by-layer interfacially engineered anticorrosive and bioactive coating consisting of a natural oxide lower layer, hydroxyapatite (HA) middle layer, and silk fibroin (SF) top layer was fabricated and investigated. Anodization was used to create natural oxide layer induced microroughness on substrates. The electrochemically deposited HA layer improved the surface microroughness and microhardness but significantly decreased Mg ion release, hydrogen gas evolution, and weight loss in simulated body fluid. The spin-coated SF layer further decreased hydrophilicity, in vitro degradation, and corrosion rate. The nonspecific and specific intermolecular interactions between fabricated layers along with their mechanical interlocking interface contributed to improved adhesion strength and integrity of the coating. The SF+HA-coated samples showed enhanced degradation and corrosion resistance due to a synergistic effect of the underlying HA layer, hindering the ingress of aggressive ions and the top hydrophobic SF layer, preventing the ingress of corrosive solution. The SF+HA-coated Mg and WE43 Mg alloy samples exhibited 50 and 26 times decreased corrosion rate, respectively, compared to uncoated samples. Moreover, in vitro cytotoxicity and cell culture studies using a mouse fibroblast cell showed that the SF+HA hybrid coating improved the cell viability, attachment, and proliferation, with cells exhibiting elongated morphology on coated samples as compared to a round shape on uncoated samples.
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Affiliation(s)
- Md Mostafizur Rahman
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Amanda Abraham
- ARC Centre of Excellence for Nanoscale BioPhotonics, School of Science, RMIT University, Melbourne, VIC 3000, Australia
| | - Naba K Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC 3000, Australia
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13
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Mettu S, Hathi Z, Athukoralalage S, Priya A, Lam TN, Ong KL, Choudhury NR, Dutta NK, Curvello R, Garnier G, Lin CSK. Perspective on Constructing Cellulose-Hydrogel-Based Gut-Like Bioreactors for Growth and Delivery of Multiple-Strain Probiotic Bacteria. J Agric Food Chem 2021; 69:4946-4959. [PMID: 33890783 PMCID: PMC8154558 DOI: 10.1021/acs.jafc.1c00468] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 03/31/2021] [Accepted: 04/14/2021] [Indexed: 05/16/2023]
Abstract
The current perspective presents an outlook on developing gut-like bioreactors with immobilized probiotic bacteria using cellulose hydrogels. The innovative concept of using hydrogels to simulate the human gut environment by generating and maintaining pH and oxygen gradients in the gut-like bioreactors is discussed. Fundamentally, this approach presents novel methods of production as well as delivery of multiple strains of probiotics using bioreactors. The relevant existing synthesis methods of cellulose hydrogels are discussed for producing porous hydrogels. Harvesting methods of multiple strains are discussed in the context of encapsulation of probiotic bacteria immobilized on cellulose hydrogels. Furthermore, we also discuss recent advances in using cellulose hydrogels for encapsulation of probiotic bacteria. This perspective also highlights the mechanism of probiotic protection by cellulose hydrogels. Such novel gut-like hydrogel bioreactors will have the potential to simulate the human gut ecosystem in the laboratory and stimulate new research on gut microbiota.
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Affiliation(s)
- Srinivas Mettu
- School
of Energy and Environment, City University
of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
- Chemical
and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Zubeen Hathi
- School
of Energy and Environment, City University
of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
| | - Sandya Athukoralalage
- Chemical
and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Anshu Priya
- School
of Energy and Environment, City University
of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
| | - Tsz Nok Lam
- School
of Energy and Environment, City University
of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
| | - Khai Lun Ong
- School
of Energy and Environment, City University
of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
| | - Namita Roy Choudhury
- Chemical
and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Naba Kumar Dutta
- Chemical
and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Rodrigo Curvello
- Bioresource
Processing Institute of Australia (BioPRIA), Department of Chemical
Engineering, Monash University, Clayton Victoria 3800, Australia
| | - Gil Garnier
- Bioresource
Processing Institute of Australia (BioPRIA), Department of Chemical
Engineering, Monash University, Clayton Victoria 3800, Australia
| | - Carol Sze Ki Lin
- School
of Energy and Environment, City University
of Hong Kong, Tat Chee
Avenue, Kowloon, Hong Kong
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14
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Saleh Alghamdi S, John S, Roy Choudhury N, Dutta NK. Additive Manufacturing of Polymer Materials: Progress, Promise and Challenges. Polymers (Basel) 2021; 13:753. [PMID: 33670934 PMCID: PMC7957542 DOI: 10.3390/polym13050753] [Citation(s) in RCA: 56] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2021] [Revised: 02/24/2021] [Accepted: 02/25/2021] [Indexed: 12/21/2022] Open
Abstract
The use of additive manufacturing (AM) has moved well beyond prototyping and has been established as a highly versatile manufacturing method with demonstrated potential to completely transform traditional manufacturing in the future. In this paper, a comprehensive review and critical analyses of the recent advances and achievements in the field of different AM processes for polymers, their composites and nanocomposites, elastomers and multi materials, shape memory polymers and thermo-responsive materials are presented. Moreover, their applications in different fields such as bio-medical, electronics, textiles, and aerospace industries are also discussed. We conclude the article with an account of further research needs and future perspectives of AM process with polymeric materials.
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Affiliation(s)
- Saad Saleh Alghamdi
- School of Engineering, Chemical and Environmental Engineering, RMIT University, Melbourne 3000, Australia
| | - Sabu John
- School of Engineering, Manufacturing, Materials and Mechatronics, RMIT University, Bundoora 3083, Australia
| | - Namita Roy Choudhury
- School of Engineering, Chemical and Environmental Engineering, RMIT University, Melbourne 3000, Australia
| | - Naba K Dutta
- School of Engineering, Chemical and Environmental Engineering, RMIT University, Melbourne 3000, Australia
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15
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Abstract
Intrinsically disordered proteins have dramatically changed the structure-function paradigm of proteins in the 21st century. Resilin is a native elastic insect protein, which features intrinsically disordered structure, unusual multi-stimuli responsiveness and outstanding resilience. Advances in computational techniques, polypeptide synthesis methods and modular protein engineering routines have led to the development of novel resilin-like polypeptides (RLPs) including modular RLPs, expanding their applications in tissue engineering, drug delivery, bioimaging, biosensors, catalysis and bioelectronics. However, how the responsive behaviour of RLPs is encoded in the amino acid sequence level remains elusive. This review summarises the milestones of RLPs, and discusses the development of modular RLP-based biomaterials, their current applications, challenges and future perspectives. A perspective of future research is that sequence and responsiveness profiling of RLPs can provide a new platform for the design and development of new modular RLP-based biomaterials with programmable structure, properties and functions.
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Affiliation(s)
- Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia
| | - Naba K Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
| | - Ankit K Dutta
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, 02115, USA
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
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16
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Dorishetty P, Dutta NK, Choudhury NR. Silk fibroins in multiscale dimensions for diverse applications. RSC Adv 2020; 10:33227-33247. [PMID: 35515035 PMCID: PMC9056751 DOI: 10.1039/d0ra03964k] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2020] [Accepted: 08/18/2020] [Indexed: 12/17/2022] Open
Abstract
Silk biomaterials in different forms such as particles, coatings and their assemblies, represent unique type of materials in multiple scales and dimensions. Herein, we provide an overview of multi-scale silk fibroin materials including silk particles, silk coatings and silk assemblies, each of which represents a unique type of material with wide range of applications. They feature tunable structures and mechanical properties with excellent biocompatibility, which are essentially required for various biomedical and drug delivery applications. The review focuses on bringing a new perspective on the utilization of regenerated silk fibroins in modern biomedicine by beginning with the fabrication of silk in multiscale dimensions and their state-of-the-art applications in various biomedical and bioelectronic fields. It covers the fundamentals of processing silk fibroins in multi-dimensions (sizes and shapes) with a specific emphasis on its structural tunability at various length scales (nano-micro) by using the latest fabrication methods/mechanisms and advanced fabrication technologies, followed by their recent applications in diverse fields of biomedicine.
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Affiliation(s)
- Pramod Dorishetty
- School of Engineering, RMIT University Melbourne Victoria 3000 Australia
| | - Naba K Dutta
- School of Engineering, RMIT University Melbourne Victoria 3000 Australia
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17
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Siddique TA, Dutta NK, Roy Choudhury N. Nanofiltration for Arsenic Removal: Challenges, Recent Developments, and Perspectives. Nanomaterials (Basel) 2020; 10:E1323. [PMID: 32640523 PMCID: PMC7407220 DOI: 10.3390/nano10071323] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 06/09/2020] [Accepted: 06/29/2020] [Indexed: 01/25/2023]
Abstract
Arsenic (As) removal is of major significance because inorganic arsenic is highly toxic to all life forms, is a confirmed carcinogen, and is of significant environmental concern. As contamination in drinking water alone threatens more than 150 million people all over the world. Therefore, several conventional methods such as oxidation, coagulation, adsorption, etc., have been implemented for As removal, but due to their cost-maintenance limitations; there is a drive for advanced, low cost nanofiltration membrane-based technology. Thus, in order to address the increasing demand of fresh and drinking water, this review focuses on advanced nanofiltration (NF) strategy for As removal to safeguard water security. The review concentrates on different types of NF membranes, membrane fabrication processes, and their mechanism and efficiency of performance for removing As from contaminated water. The article provides an overview of the current status of polymer-, polymer composite-, and polymer nanocomposite-based NF membranes, to assess the status of nanomaterial-facilitated NF membranes and to incite progress in this area. Finally, future perspectives and future trends are highlighted.
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Affiliation(s)
| | - Naba K. Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia;
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia;
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18
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Rahman M, Dutta NK, Roy Choudhury N. Magnesium Alloys With Tunable Interfaces as Bone Implant Materials. Front Bioeng Biotechnol 2020; 8:564. [PMID: 32587850 PMCID: PMC7297987 DOI: 10.3389/fbioe.2020.00564] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 05/11/2020] [Indexed: 12/20/2022] Open
Abstract
Magnesium (Mg) based biodegradable materials are a new generation orthopedic implant materials that are intended to possess same mechanical properties as that of bone. Mg alloys are considered as promising substitutes to permanent implants due to their biodegradability in the physiological environment. However, rapid corrosion rate is one of the major constraints of using Mg alloys in clinical applications in spite of their excellent biocompatibility. Approaches to overcome the limitations include the selection of adequate alloying elements, proper surface treatment, surface modification with coating to control the degradation rate. This review focuses on current advances on surface engineering of Mg based biomaterials for biomedical applications. The review begins with a description of corrosion mechanism of Mg alloy, the requirement for appropriate surface functionalization/coatings, their structure-property-performance relationship, and suitability for biomedical applications. The control of physico-chemical properties such as wettability, surface morphology, surface chemistry, and surface functional groups of the coating tailored by various approaches forms the pivotal part of the review. Chemical surface treatment offers initial protection from corrosion and inorganic coating like hydroxyapatite (HA) improves the biocompatibility of the substrate. Considering the demand of ideal implant materials, multilayer hybrid coatings on Mg alloy in combination with chemical pretreatment or inorganic HA coating, and protein-based polymer coating could be a promising technique to improve corrosion resistance and promote biocompatibility of Mg-based alloys.
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Affiliation(s)
| | | | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, VIC, Australia
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19
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Knott R, Dutta NK, Choudhury NR. Molecular structure development in silsesquioxane−urethane thin film hybrids: A small‐angle neutron scattering investigation. J Appl Polym Sci 2019. [DOI: 10.1002/app.48772] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Robert Knott
- Australian Nuclear Science and Technology Organisation, Private Mail Bag Kirrawee New South Wales 2232 Australia
| | - Naba K. Dutta
- School of EngineeringRMIT University Melbourne Victoria 3000 Australia
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20
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Athukoralalage SS, Balu R, Dutta NK, Roy Choudhury N. 3D Bioprinted Nanocellulose-Based Hydrogels for Tissue Engineering Applications: A Brief Review. Polymers (Basel) 2019; 11:E898. [PMID: 31108877 PMCID: PMC6572377 DOI: 10.3390/polym11050898] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 04/25/2019] [Accepted: 04/26/2019] [Indexed: 01/06/2023] Open
Abstract
Nanocellulosic materials, such as cellulose nanocrystals, cellulose nanofibers, and bacterial nanocellulose, that display high surface area, mechanical strength, biodegradability, and tunable surface chemistry have attracted great attention over the last decade for biomedical applications. Simultaneously, 3D printing is revolutionizing the field of biomedical engineering, which enables the fast and on-demand printing of customizable scaffolds, tissues, and organs. Nanocellulosic materials hold tremendous potential for 3D bioprinting due to their printability, their shear thinning behavior, their ability to live cell support and owing to their excellent biocompatibility. The amalgamation of nanocellulose-based feedstocks and 3D bioprinting is therefore of critical interest for the development of advanced functional 3D hydrogels. In this context, this review briefly discusses the most recent key developments and challenges in 3D bioprinting nanocellulose-based hydrogel constructs that have been successfully tested for mammalian cell viability and used in tissue engineering applications.
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Affiliation(s)
- Sandya S Athukoralalage
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
| | - Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
| | - Naba K Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
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21
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Balu R, Choudhury NR, Mata JP, de Campo L, Rehm C, Hill AJ, Dutta NK. Evolution of the Interfacial Structure of a Catalyst Ink with the Quality of the Dispersing Solvent: A Contrast Variation Small-Angle and Ultrasmall-Angle Neutron Scattering Investigation. ACS Appl Mater Interfaces 2019; 11:9934-9946. [PMID: 30762351 DOI: 10.1021/acsami.8b20645] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The electrocatalyst layer (ECL) of the proton-exchange membrane fuel cell (PEMFC) is commonly fabricated from colloidal catalyst ink containing carbon-supported catalyst nanoparticles (NPs), ionomer stabilizer, and dispersion medium (DM). The structure, stability, and aggregate size distribution of fuel cell catalyst ink are critically dependent on the quality of DM. However, understanding of the influence of the quality of DM on the hierarchical structure of the ECL is lacking. This work presents a systematic investigation of the effects of reducing alcohol content in isopropyl alcohol/water (IPA/H2O) binary mixtures as DM on the structural evolution of water-rich (green) catalyst ink using contrast-variation small-angle and ultrasmall-angle neutron scattering techniques. Both qualitative and quantitative information are extracted from the data to obtain information about the size, structure, and organization of the catalyst ink using different model functions fit to the experimental data. The catalyst ink prepared using 70% IPA (commonly employed in industry and extensively reported in the literature) is shown to consist of randomly distributed globular carbon aggregates (mean radius of gyration of ∼178.9 nm) stabilized by an ionomer mass fractal shell (thickness of ∼13.0 nm), which is dispersed in the matrix of rodlike (∼1.3 nm radius and ∼35.0 nm length) negatively surface-charged ionomer NPs. These well characterized baseline data are then compared and contrasted with DM formulations of lower IPA content. A sequential reduction in IPA content of DM shows a progressive increase in the ionomer NP radius and electrostatic repulsion, concomitantly with the decrease in the carbon aggregate size and ionomer shell thickness of the catalyst ink. Therefore, the changes in the interfacial structure via adjustments of the DM composition can be used as a controlling parameter to tailor the hierarchical structure of the colloidal fuel cell catalyst ink and to further optimize the performance of the ECL.
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Affiliation(s)
- Rajkamal Balu
- Chemical and Environmental Engineering, School of Engineering , RMIT University , Melbourne , Victoria 3000 , Australia
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering , RMIT University , Melbourne , Victoria 3000 , Australia
| | - Jitendra P Mata
- Australian Centre for Neutron Scattering (ACNS) , Australian Nuclear Science and Technology Organisation (ANSTO) , Lucas Heights , New South Wales 2234 , Australia
| | - Liliana de Campo
- Australian Centre for Neutron Scattering (ACNS) , Australian Nuclear Science and Technology Organisation (ANSTO) , Lucas Heights , New South Wales 2234 , Australia
| | - Christine Rehm
- Australian Centre for Neutron Scattering (ACNS) , Australian Nuclear Science and Technology Organisation (ANSTO) , Lucas Heights , New South Wales 2234 , Australia
- Guangdong Technion Israel Institute of Technology, Shantou , Guangdong Province 515063 , People's Republic of China
| | - Anita J Hill
- CSIRO Manufacturing , Bayview Avenue , Clayton , Victoria 3168 , Australia
| | - Naba K Dutta
- Chemical and Environmental Engineering, School of Engineering , RMIT University , Melbourne , Victoria 3000 , Australia
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22
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Subianto S, Balu R, de Campo L, Sokolova A, Dutta NK, Choudhury NR. Sulfonated Thiophene Derivative Stabilized Aqueous Poly(3-hexylthiophene):Phenyl-C 61-butyric Acid Methyl Ester Nanoparticle Dispersion for Organic Solar Cell Applications. ACS Appl Mater Interfaces 2018; 10:44116-44125. [PMID: 30474957 DOI: 10.1021/acsami.8b15589] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Aqueous dispersions of poly(3-hexylthiophene):phenyl-C61-butyric acid methyl ester (P3HT:PCBM) nanoparticles (NPs) have been fabricated using a thiophene-based surfactant 2-(3-thienyl)ethyloxybutylsulfonate sodium salt (TEBS) for the first time via the mini-emulsion process. The use of TEBS resulted in a stable colloidal dispersion of P3HT:PCBM NPs, of which the effect of various fabrication parameters is investigated. The fabricated NPs were characterized by dynamic light scattering, scanning electron microscopy, UV-visible spectroscopy, contrast-variation small and ultra-small angle neutron scattering, and cyclic voltammetry. The internal structure and electrochemical performance of TEBS-stabilized P3HT:PCBM NPs were compared to those of sodium dodecyl sulfate-stabilized core-shell (PCBM-P3HT) NPs at the same surfactant concentration. Neutron scattering and cyclic voltammetry results reveal a homogeneous distribution of small de-mixed P3HT and PCBM domains in the internal structure of TEBS-stabilized P3HT:PCBM NPs, reminiscent of cast film. Moreover, electron microscopy images show evidence of diffused NP surface/interface upon drying (without annealing), which indicates that the thiophene-containing TEBS may improve compatibility and film-forming properties of fabricated P3HT:PCBM NPs, and consequently be more suited for conventional film-processing methods for organic solar cell applications.
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Affiliation(s)
- Surya Subianto
- Future Industries Institute , University of South Australia , Mawson Lakes , South Australia 5095 , Australia
| | - Rajkamal Balu
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Liliana de Campo
- Australian Centre for Neutron Scattering (ACNS) , Australian Nuclear Science and Technology Organisation (ANSTO) , Lucas Heights , New South Wales 2232 , Australia
| | - Anna Sokolova
- Australian Centre for Neutron Scattering (ACNS) , Australian Nuclear Science and Technology Organisation (ANSTO) , Lucas Heights , New South Wales 2232 , Australia
| | - Naba K Dutta
- Future Industries Institute , University of South Australia , Mawson Lakes , South Australia 5095 , Australia
- School of Chemical Engineering , University of Adelaide , Adelaide , South Australia 5005 , Australia
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Namita Roy Choudhury
- Future Industries Institute , University of South Australia , Mawson Lakes , South Australia 5095 , Australia
- School of Chemical Engineering , University of Adelaide , Adelaide , South Australia 5005 , Australia
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
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23
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Tran TS, Dutta NK, Choudhury NR. Graphene inks for printed flexible electronics: Graphene dispersions, ink formulations, printing techniques and applications. Adv Colloid Interface Sci 2018; 261:41-61. [PMID: 30318342 DOI: 10.1016/j.cis.2018.09.003] [Citation(s) in RCA: 120] [Impact Index Per Article: 20.0] [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: 07/25/2018] [Revised: 09/18/2018] [Accepted: 09/24/2018] [Indexed: 11/17/2022]
Abstract
Graphene inks have recently enabled the dramatic improvement of printed flexible electronics due to their low cost, ease of processability, higher conductivity and flexibility. In this review, we discuss the state-of-the-art of the fundamental formulation of graphene inks and the current printing techniques used for inks deposition, followed by recent practical applications for printed flexible electronics. The progression of science and technology for the dispersion of graphene using variety of solvents and the characteristics of the resulting conductive inks have been highlighted, with specific emphasis focused on the challenges to be resolved. The printing techniques discussed here include screen printing, gravure printing, inkjet printing and other emerging printing technologies. Each approach's pros and cons are discussed in correlation with the ink formulations and the operating principles. We also discuss the challenges and outlook of graphene ink for its future development in the world of printed flexible devices.
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Affiliation(s)
- Tuan Sang Tran
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Naba Kumar Dutta
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia
| | - Namita Roy Choudhury
- Chemical and Environmental Engineering, School of Engineering, RMIT University, Melbourne, Victoria 3000, Australia.
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24
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Balu R, Reeder S, Knott R, Mata J, de Campo L, Dutta NK, Choudhury NR. Tough Photocrosslinked Silk Fibroin/Graphene Oxide Nanocomposite Hydrogels. Langmuir 2018; 34:9238-9251. [PMID: 29989819 DOI: 10.1021/acs.langmuir.8b01141] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The development of protein-based hydrogels for tissue engineering applications is often limited by their mechanical properties. Herein, we present the facile fabrication of tough regenerated silk fibroin (RSF)/graphene oxide (GO) nanocomposite hydrogels by a photochemical cross-linking method. The RSF/GO composite hydrogels demonstrated soft and adhesive properties during initial stages of photocrosslinking (<2 min), which is not observed for the pristine RSF hydrogel, and rendered a tough and nonadhesive hydrogel upon complete cross-linking (10 min). The composite hydrogels exhibited superior tensile mechanical properties, increased β-sheet content, and decreased chain mobility compared to that of the pristine RSF hydrogels. The composite hydrogels demonstrated Young's modulus as high as ∼8 MPa, which is significantly higher than native cartilage (∼1.5 MPa), and tensile toughness as high as ∼2.4 MJ/m3, which is greater than that of electroactive polymer muscles and at par with RSF/GO composite membranes fabricated by layer-by-layer assembly. Small-angle scattering study reveals the hierarchical structure of photocrosslinked RSF hydrogels to comprise randomly distributed water-poor (hydrophobic) and water-rich (hydrophilic) regions at the nanoscale, whereas water pores and channels exhibiting fractal-like characteristics at the microscale. The size of hydrophobic domain (containing β-sheets) was observed to increase slightly with GO incorporation and/or alcohol post-treatment, whereas the size of the hydrophilic domain (intersheet distance containing random coils) was observed to increase significantly, which influences/affects water uptake capacity, cross-link density, and mechanical properties of hydrogels. The presented results have implications for both fundamental understanding of the structure-property relationship of RSF-based hydrogels and their technological applications.
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Affiliation(s)
- Rajkamal Balu
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Shaina Reeder
- School of Chemical Engineering , University of Adelaide , Adelaide , South Australia 5005 , Australia
| | - Robert Knott
- Australian Centre for Neutron Scattering , Australian Nuclear Science and Technology Organisation , Sydney , New South Wales 2232 , Australia
| | - Jitendra Mata
- Australian Centre for Neutron Scattering , Australian Nuclear Science and Technology Organisation , Sydney , New South Wales 2232 , Australia
| | - Liliana de Campo
- Australian Centre for Neutron Scattering , Australian Nuclear Science and Technology Organisation , Sydney , New South Wales 2232 , Australia
| | - Naba Kumar Dutta
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
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25
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Whittaker JL, Balu R, Knott R, de Campo L, Mata JP, Rehm C, Hill AJ, Dutta NK, Roy Choudhury N. Structural evolution of photocrosslinked silk fibroin and silk fibroin-based hybrid hydrogels: A small angle and ultra-small angle scattering investigation. Int J Biol Macromol 2018; 114:998-1007. [DOI: 10.1016/j.ijbiomac.2018.03.044] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2017] [Revised: 03/07/2018] [Accepted: 03/11/2018] [Indexed: 10/17/2022]
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26
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Subianto S, Dutta NK, Choudhury NR. Water-Reprocessable, Reformable, and Ecofriendly Sustainable Material Based on Disulfide-Cross-Linked Polyethyleneimine. ACS Omega 2017; 2:3036-3042. [PMID: 31457637 PMCID: PMC6641179 DOI: 10.1021/acsomega.7b00489] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 06/09/2017] [Indexed: 05/06/2023]
Abstract
A reformable polymer gel material has been developed based on the disulfide cross-linking of low-molecular-weight polyethylenimine (PEI) that can be synthesized through a facile thiolation method and reprocessed through an aqueous method without the use of solvents or additional chemicals. Despite being made with water-soluble PEI, the cross-linked gel shows good mechanical integrity and its properties can be controlled through the fabrication parameters, maintaining the hydrophilic nature of PEI while being sufficiently robust to form a free-standing film that does not dissolve in water. The properties of the gel have been characterized by Fourier transform infrared spectroscopy, thermogravimetry, and dynamic mechanical analyses, showing the effect of parameters such as the degree of thiolation and thermal curing. The reformability of the gel comes from the disulfide cross-links, which can be disrupted and reformed through a simple, aqueous processing method utilizing ultrasonication, creating an aqueous dispersion, which can be recast multiple times with minimal loss in physical properties.
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Affiliation(s)
- Surya Subianto
- Future
Industries Institute, University of South
Australia, Adelaide, South Australia 5001, Australia
| | - Naba Kumar Dutta
- Future
Industries Institute, University of South
Australia, Adelaide, South Australia 5001, Australia
- School
of Chemical Engineering, The University
of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
| | - Namita Roy Choudhury
- Future
Industries Institute, University of South
Australia, Adelaide, South Australia 5001, Australia
- School
of Chemical Engineering, The University
of Adelaide, North Terrace, Adelaide, South Australia 5005, Australia
- E-mail: ,
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27
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Subianto S, Dutta N, Andersson M, Choudhury NR. Bulk heterojunction organic photovoltaics from water-processable nanomaterials and their facile fabrication approaches. Adv Colloid Interface Sci 2016; 235:56-69. [PMID: 27396690 DOI: 10.1016/j.cis.2016.05.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2016] [Revised: 05/27/2016] [Accepted: 05/28/2016] [Indexed: 11/28/2022]
Abstract
Organic thin film photovoltaics based on bulk-heterojunction donor-acceptor combinations have received significant interest due to their potential for low-cost, large-scale solution processing. However, current state-of-the-art cells utilise materials soluble mainly in halogenated solvents which pose processing challenges due to their toxicity and thus environmental hazards. In this contribution, we look at various nanomaterials, and alternative processing of these solar cells using environmentally friendly solvents, and review recently reported different strategies and approaches that are making inroads in this field. Specifically, we focus on the use of water-dispersible donors and acceptors, use of aqueous solvents for fabrication and discuss the merits of the two main approaches of water-processable solar cells; namely, through the use of water-soluble materials and the use of aqueous dispersion rather than a solution, as well as review some of the recent advances in alternative fabrication techniques.
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Affiliation(s)
- Surya Subianto
- Future Industries Institute, University of South Australia, 5095, Australia
| | - Naba Dutta
- Future Industries Institute, University of South Australia, 5095, Australia; School of Chemical Engineering, The University of Adelaide, 5005, Australia
| | - Mats Andersson
- Future Industries Institute, University of South Australia, 5095, Australia
| | - Namita Roy Choudhury
- Future Industries Institute, University of South Australia, 5095, Australia; School of Chemical Engineering, The University of Adelaide, 5005, Australia.
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28
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Taghavikish M, Subianto S, Dutta NK, de Campo L, Mata JP, Rehm C, Choudhury NR. Polymeric Ionic Liquid Nanoparticle Emulsions as a Corrosion Inhibitor in Anticorrosion Coatings. ACS Omega 2016; 1:29-40. [PMID: 31457116 PMCID: PMC6640733 DOI: 10.1021/acsomega.6b00027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 06/15/2016] [Indexed: 05/12/2023]
Abstract
In this contribution, we report the facile preparation of cross-linked polymerizable ionic liquid (PIL)-based nanoparticles via thiol-ene photopolymerization in a miniemulsion. The synthesized PIL nanoparticles with a diameter of about 200 nm were fully characterized with regard to their chemical structures, morphologies, and properties using different techniques, such as Fourier transform infrared spectroscopy, thermogravimetric analysis, scanning electron microscopy, and transmission electron microscopy. To gain an in-depth understanding of the physical and morphological structures of the PIL nanoparticles in an emulsion, small-angle neutron scattering and ultra-small-angle neutron scattering were used. Neutron scattering studies revealed valuable information regarding the formation of cylindrical ionic micelles in the spherical nanoparticles, which is a unique property of this system. Furthermore, the PIL nanoparticle emulsion was utilized as an inhibitor in a self-assembled nanophase particle (SNAP) coating. The corrosion protection ability of the resultant coating was examined using potentiodynamic polarization and electrochemical impedance spectroscopy. The results show that the PIL nanoparticle emulsion in the SNAP coating acts as an inhibitor of corrosion and is promising for fabricating advanced coatings with improved barrier function and corrosion protection.
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Affiliation(s)
- Mona Taghavikish
- Future
Industries Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia
| | - Surya Subianto
- Future
Industries Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia
| | - Naba Kumar Dutta
- Future
Industries Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia
- School
of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
| | - Liliana de Campo
- Bragg
Institute, ANSTO, New
Illawarra Rd, Lucas Heights, Sydney, NSW 2234, Australia
| | - Jitendra P. Mata
- Bragg
Institute, ANSTO, New
Illawarra Rd, Lucas Heights, Sydney, NSW 2234, Australia
| | - Christine Rehm
- Bragg
Institute, ANSTO, New
Illawarra Rd, Lucas Heights, Sydney, NSW 2234, Australia
| | - Namita Roy Choudhury
- Future
Industries Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia
- School
of Chemical Engineering, University of Adelaide, Adelaide, SA 5005, Australia
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Whittaker JL, Dutta NK, Zannettino A, Choudhury NR. Engineering DN hydrogels from regenerated silk fibroin and poly(N-vinylcaprolactam). J Mater Chem B 2016; 4:5519-5533. [PMID: 32263350 DOI: 10.1039/c6tb01055e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The development of novel hydrogels that possess adequate elasticity and toughness to withstand mechanically active environments, along with being biocompatible, remains a significant challenge in the design of materials for tissue engineering applications. In this study, a family of regenerated silk fibroin (RSF) based double network (DN) hydrogels were fabricated for the first time using a rapid one-pot method. The DN hydrogels combine the rigid covalently crosslinked RSF with the softer poly(N-vinylcaprolactam) (PVCL) through strong physical interactions. The formation of these DN hydrogels resulted in an improvement of the water uptake capacity, elasticity and toughness compared to the individual RSF hydrogel. The elasticity of the RSF/PVCL DN hydrogels was closer to that of native cartilage, which makes them promising materials for cartilage regeneration applications. An in vitro study on adhesion, proliferation and differentiation of a mouse pre-chondrocyte cell line (ATDC5) conducted using microscopic analysis, a cell proliferation assay and RT-PCR confirmed the cells cultured on the less stiff hydrogels demonstrated the most favourable chondrogenic response. Thus, this study demonstrates the potential of RSF-based hybrid hydrogels for cartilage tissue engineering applications.
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Affiliation(s)
- Jasmin L Whittaker
- Future Industries Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, SA 5095, Australia.
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Whittaker JL, Subianto S, Dutta NK, Choudhury NR. Induced insolubility of electrospun poly(N-vinylcaprolactam) fibres through hydrogen bonding with Tannic acid. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.01.072] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Whittaker JL, Dutta NK, Knott R, McPhee G, Voelcker NH, Elvin C, Hill A, Choudhury NR. Tunable Thermoresponsiveness of Resilin via Coassembly with Rigid Biopolymers. Langmuir 2015; 31:8882-8891. [PMID: 26177160 DOI: 10.1021/acs.langmuir.5b01014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [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 ability to tune the thermoresponsiveness of recombinant resilin protein, Rec1-resilin, through a facile coassembly system was investigated in this study. The effects of change in conformation and morphology with time and the responsive behavior of Rec1-resilin in solution were studied in response to the addition of a rigid model polypeptide (poly-l-proline) or a hydrophobic rigid protein (Bombyx mori silk fibroin). It was observed that by inducing more ordered conformations and increasing the hydrophobicity the lower critical solution temperature (LCST) of the system was tuned to lower values. Time and temperature were found to be critical parameters in controlling the coassembly behavior of Rec1-resilin in both the model polypeptide and more complex protein systems. Such unique properties are useful for a wide range of applications, including drug delivery and soft tissue engineering applications.
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Affiliation(s)
- Jasmin L Whittaker
- †Ian Wark Research Institute, University of South Australia, Mawson Lakes Boulevard, Adelaide, South Australia 5095, Australia
| | - Naba K Dutta
- †Ian Wark Research Institute, University of South Australia, Mawson Lakes Boulevard, Adelaide, South Australia 5095, Australia
| | - Robert Knott
- ‡Bragg Institute, ANSTO, Lucas Heights, New South Wales 2234, Australia
| | - Gordon McPhee
- §Mawson Institute, University of South Australia, Mawson Lakes Boulevard, Adelaide, South Australia 5095, Australia
| | - Nicolas H Voelcker
- §Mawson Institute, University of South Australia, Mawson Lakes Boulevard, Adelaide, South Australia 5095, Australia
| | - Chris Elvin
- ∥CSIRO Agriculture, Queensland Bioscience Precinct, 306 Carmody Road, St. Lucia, Queensland 4067, Australia
| | - Anita Hill
- ⊥CSIRO Manufacturing, Bayview Avenue, Clayton, Victoria 3168, Australia
| | - Namita Roy Choudhury
- †Ian Wark Research Institute, University of South Australia, Mawson Lakes Boulevard, Adelaide, South Australia 5095, Australia
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Taghavikish M, Subianto S, Dutta NK, Choudhury NR. Facile Fabrication of Polymerizable Ionic Liquid Based-Gel Beads via Thiol-ene Chemistry. ACS Appl Mater Interfaces 2015; 7:17298-306. [PMID: 26171715 DOI: 10.1021/acsami.5b04405] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Multipurpose gel beads prepared from natural or synthetic polymers have received significant attention in various applications such as drug delivery, coatings, and electrolytes because of their versatility and unique performance as micro- and nanocontainers.1 However, comparatively little work has been done on poly(ionic liquid)-based materials despite their unique ionic characteristics. Thus, in this contribution we report the facile preparation of polymerizable ionic liquid-based gel beads using thiol-ene click chemistry. This novel system incorporates pentaerythritol tetra (3-mercaptopropionate) (PETKMP) and 1,4-di(vinylimidazolium) butane bisbromide in a thiol-ene-based photopolymerization to fabricate the gel beads. Their chemical structure, thermal and mechanical properties have been investigated using Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA). The gel beads possess low Tg and their ionic functionalities attribute self-healing properties and their ability to uptake small molecules or organic compounds offers their potential use as pH sensing material and macrocontainers.
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Affiliation(s)
- Mona Taghavikish
- Ian Wark Research Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia
| | - Surya Subianto
- Ian Wark Research Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia
| | - Naba Kumar Dutta
- Ian Wark Research Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia
| | - Namita Roy Choudhury
- Ian Wark Research Institute, Mawson Lakes Campus, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia
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Abstract
Esophageal cancer patients are often diagnosed as "advanced" cases. These patients are subjected to palliative stenting using self-expanding metallic stents (SEMS) to maintain oral alimentation. Unfortunately, SEMS get reoccluded due to tumor growth, in and over the stent struts. To investigate potential solutions to this problem, docetaxel (DTX) delivery films were prepared using PurSil AL 20 (PUS), which can be used as a covering material for the SEMS. Drug-polymer miscibility and interactions were studied. Bilayer films were prepared by adhering the blank film to the DTX loaded film in order to maintain the unidirectional delivery to the esophagus. In vitro release and the local DTX delivery were studied using in vitro permeation experiments. It was found that DTX and PUS were physically and chemically compatible. The bilayer films exhibited sustained release (>30 days) and minimal DTX permeation through esophageal tissues in vitro. The rate-determining step for the DTX delivery was calculated. It was found that >0.9 fraction of rate control lies with the esophageal tissues, suggesting that DTX delivery can be sustained for longer periods compared to the in vitro release observed. Thus, the bilayer films can be developed as a localized sustained delivery system in combination with the stent.
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Affiliation(s)
- Mohsin Shaikh
- †Centre for Pharmaceutical Innovation and Development (CPID), School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia 5000, Australia
| | - Namita Roy Choudhury
- ‡Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, South Australia 5095, Australia
| | - Robert Knott
- §ANSTO, Locked Bag 2001, Kirrawee, New South Wales 2232, Australia
| | - Sanjay Garg
- †Centre for Pharmaceutical Innovation and Development (CPID), School of Pharmacy and Medical Sciences, University of South Australia, Adelaide, South Australia 5000, Australia
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Rohatgi CV, Dutta NK, Choudhury NR. Separator Membrane from Crosslinked Poly(Vinyl Alcohol) and Poly(Methyl Vinyl Ether-alt-Maleic Anhydride). Nanomaterials (Basel) 2015; 5:398-414. [PMID: 28347019 PMCID: PMC5312902 DOI: 10.3390/nano5020398] [Citation(s) in RCA: 21] [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] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/06/2015] [Revised: 03/08/2015] [Accepted: 03/12/2015] [Indexed: 11/24/2022]
Abstract
In this work, we report separator membranes from crosslinking of two polymers, such as poly vinyl alcohol (PVA) with an ionic polymer poly(methyl vinyl ether-alt-maleic anhydride) (PMVE-MA). Such interpolymer-networked systems were extensively used for biomedical and desalination applications but they were not examined for their potential use as membranes or separators for batteries. Therefore, the chemical interactions between these two polymers and the influence of such crosslinking on physicochemical properties of the membrane are systematically investigated through rheology and by critical gel point study. The hydrogen bonding and the chemical interaction between PMVE-MA and PVA resulted in highly cross-linked membranes. Effect of the molecular weight of PVA on the membrane properties was also examined. The developed membranes were extensively characterized by studying their physicochemical properties (water uptake, swelling ratio, and conductivity), thermal and electrochemical properties using differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermo-gravimetric analysis (TGA) and electrochemical impedance spectroscopy (EIS). The DSC study shows the presence of a single Tg in the membranes indicating compatibility of the two polymers in flexible and transparent films. The membranes show good stability and ion conductivity suitable for separator applications.
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Affiliation(s)
| | - Naba K Dutta
- Ian Wark Institute, University of South Australia, Mawson Lakes 5095, Australia.
| | - Namita Roy Choudhury
- Ian Wark Institute, University of South Australia, Mawson Lakes 5095, Australia.
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Ahmed F, Roy Choudhury N, Dutta NK, Zou L, Zannettino A. Fabrication and characterisation of an electrospun tubular 3D scaffold platform of poly(vinylidene fluoride-co-hexafluoropropylene) for small-diameter blood vessel application. Journal of Biomaterials Science, Polymer Edition 2014; 25:2023-41. [DOI: 10.1080/09205063.2014.968018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Garg R, Dutta NK, Choudhury NR. Work Function Engineering of Graphene. Nanomaterials (Basel) 2014; 4:267-300. [PMID: 28344223 PMCID: PMC5304665 DOI: 10.3390/nano4020267] [Citation(s) in RCA: 87] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Revised: 03/06/2014] [Accepted: 03/18/2014] [Indexed: 11/17/2022]
Abstract
Graphene is a two dimensional one atom thick allotrope of carbon that displays unusual crystal structure, electronic characteristics, charge transport behavior, optical clarity, physical & mechanical properties, thermal conductivity and much more that is yet to be discovered. Consequently, it has generated unprecedented excitement in the scientific community; and is of great interest to wide ranging industries including semiconductor, optoelectronics and printed electronics. Graphene is considered to be a next-generation conducting material with a remarkable band-gap structure, and has the potential to replace traditional electrode materials in optoelectronic devices. It has also been identified as one of the most promising materials for post-silicon electronics. For many such applications, modulation of the electrical and optical properties, together with tuning the band gap and the resulting work function of zero band gap graphene are critical in achieving the desired properties and outcome. In understanding the importance, a number of strategies including various functionalization, doping and hybridization have recently been identified and explored to successfully alter the work function of graphene. In this review we primarily highlight the different ways of surface modification, which have been used to specifically modify the band gap of graphene and its work function. This article focuses on the most recent perspectives, current trends and gives some indication of future challenges and possibilities.
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Affiliation(s)
- Rajni Garg
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
| | - Naba K Dutta
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
| | - Namita Roy Choudhury
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
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Ahmed F, Dutta NK, Zannettino A, Vandyke K, Choudhury NR. Engineering interaction between bone marrow derived endothelial cells and electrospun surfaces for artificial vascular graft applications. Biomacromolecules 2014; 15:1276-87. [PMID: 24564790 DOI: 10.1021/bm401825c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The aim of this investigation was to understand and engineer the interactions between endothelial cells and the electrospun (ES) polyvinylidene fluoride-co-hexafluoropropylene (PVDF-HFP) nanofiber surfaces and evaluate their potential for endothelialization. Elastomeric PVDF-HFP samples were electrospun to evaluate their potential use as small diameter artificial vascular graft scaffold (SDAVG) and compared with solvent cast (SC) PVDF-HFP films. We examined the consequences of fibrinogen adsorption onto the ES and SC samples for endothelialisation. Bone marrow derived endothelial cells (BMEC) of human origin were incubated with the test and control samples and their attachment, proliferation, and viability were examined. The nature of interaction of fibrinogen with SC and ES samples was investigated in detail using ELISA, XPS, and FTIR techniques. The pristine SC and ES PVDF-HFP samples displayed hydrophobic and ultrahydrophobic behavior and accordingly, exhibited minimal BMEC growth. Fibrinogen adsorbed SC samples did not significantly enhance endothelial cell binding or proliferation. In contrast, the fibrinogen adsorbed electrospun surfaces showed a clear ability to modulate endothelial cell behavior. This system also represents an ideal model system that enables us to understand the natural interaction between cells and their extracellular environment. The research reported shows potential of ES surfaces for artificial vascular graft applications.
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Affiliation(s)
- Furqan Ahmed
- Ian Wark Research Institute, University of South Australia , Mawson Lakes Campus, South Australia, Australia
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Ahmed F, Choudhury NR, Dutta NK, Brito e Abreu S, Zannettino A, Duncan E. Interaction of Platelets with Poly(vinylidene fluoride-co-hexafluoropropylene) Electrospun Surfaces. Biomacromolecules 2014; 15:744-55. [DOI: 10.1021/bm4015396] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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)
- Furqan Ahmed
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Namita Roy Choudhury
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Naba K. Dutta
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Susana Brito e Abreu
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Andrew Zannettino
- Myeloma
Research Laboratory, School of Medical Science, University of Adelaide, South
Australia, Australia
| | - Elizabeth Duncan
- Myeloma
Research Laboratory, School of Medical Science, University of Adelaide, South
Australia, Australia
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Mohsin S, Arellano IH, Choudhury NR, Garg S. Docetaxel epimerization in silicone films: a case of drug excipient incompatibility. Drug Test Anal 2014; 6:1076-84. [DOI: 10.1002/dta.1617] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 01/06/2014] [Accepted: 01/06/2014] [Indexed: 01/03/2023]
Affiliation(s)
- Shaikh Mohsin
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences; University of South Australia; Adelaide SA 5000 Australia
| | - Ian Harvey Arellano
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences; University of South Australia; Adelaide SA 5000 Australia
| | - Namita Roy Choudhury
- Ian Wark Research Institute; University of South Australia; Mawson Lakes Campus Mawson Lakes SA 5095 Australia
| | - Sanjay Garg
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences; University of South Australia; Adelaide SA 5000 Australia
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Subianto S, Choudhury NR, Dutta N. Composite Electrolyte Membranes from Partially Fluorinated Polymer and Hyperbranched, Sulfonated Polysulfone. Nanomaterials (Basel) 2013; 4:1-18. [PMID: 28348282 PMCID: PMC5304611 DOI: 10.3390/nano4010001] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Revised: 12/13/2013] [Accepted: 12/13/2013] [Indexed: 11/16/2022]
Abstract
Macromolecular modification of poly(vinylidene fluoride-co-hexafluoropropylene) (PVDF) was done with various proportions of sulfonic acid terminated, hyperbranched polysulfone (HPSU) with a view to prepare ion conducting membranes. The PVDF-co-HFP was first chemically modified by dehydrofluorination and chlorosulfonation in order to make the membrane more hydrophilic as well as to introduce unsaturation, which would allow crosslinking of the PVDF-co-HFP matrix to improve the stability of the membrane. The modified samples were characterized for ion exchange capacity, morphology, and performance. The HPSU modified S-PVDF membrane shows good stability and ionic conductivity of 5.1 mS cm-¹ at 80 °C and 100% RH for blends containing 20% HPSU, which is higher than the literature values for equivalent blend membranes using Nafion. SEM analysis of the blend membranes containing 15% or more HPSU shows the presence of spherical domains with a size range of 300-800 nm within the membranes, which are believed to be the HPSU-rich area.
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Affiliation(s)
- Surya Subianto
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
| | - Namita Roy Choudhury
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
| | - Naba Dutta
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, 5095 Adelaide, Australia.
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Ahmed F, Choudhury NR, Dutta NK, Zannettino A, Knott R. Near Superhydrophobic Fibrous Scaffold for Endothelialization: Fabrication, Characterization and Cellular Activities. Biomacromolecules 2013; 14:3850-60. [DOI: 10.1021/bm400938n] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [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)
- Furqan Ahmed
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Namita Roy Choudhury
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Naba K. Dutta
- Ian
Wark Research Institute, University of South Australia, Mawson Lakes
Campus, South Australia, Australia
| | - Andrew Zannettino
- Bone
and Cancer Research Laboratories, Haematology, Centre for Cancer Biology, SA Pathology
and School of Medical Science, University of Adelaide, Adelaide, South Australia, Australia
| | - Robert Knott
- Bragg
Institute, ANSTO, Lucas Height, Sydney, Australia
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Gao Y, Choudhury NR, Dutta NK. Tailoring the ionic association and microstructure of ionomers with various metal salts. J Appl Polym Sci 2012. [DOI: 10.1002/app.35214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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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Djordjevic I, Szili EJ, Choudhury NR, Dutta N, Steele DA, Kumar S. Osteoblast Biocompatibility on Poly(octanediol citrate)/Sebacate Elastomers with Controlled Wettability. Journal of Biomaterials Science, Polymer Edition 2012; 21:1039-50. [DOI: 10.1163/156856209x463708] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Ivan Djordjevic
- a Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia
| | - Endre J. Szili
- b Mawson Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia;,
| | - Namita Roy Choudhury
- c Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia
| | - Naba Dutta
- d Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia
| | - David A. Steele
- e Mawson Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia
| | - Sunil Kumar
- f Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia
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Chan CC, Choudhury NR, Majewski P. Fabrication and characterisation of self-assembled monolayers of N-[3-(trimethoxysilyl)propyl]diethylenetriamine on silica particles. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2010.12.003] [Citation(s) in RCA: 16] [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: 11/17/2022]
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Djordjevic I, Choudhury NR, Dutta NK, Kumar S. Poly[octanediol-co
-(citric acid)-co
-(sebacic acid)] elastomers: novel bio-elastomers for tissue engineering. POLYM INT 2011. [DOI: 10.1002/pi.2996] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Mistry MK, Choudhury NR, Dutta NK, Knott R. Nanostructure evolution in high-temperature perfluorosulfonic acid ionomer membrane by small-angle X-ray scattering. Langmuir 2010; 26:19073-19083. [PMID: 21090663 DOI: 10.1021/la1030763] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The high-temperature morphology of supported liquid membranes (SLMs) prepared from perfluorinated membranes such as Nafion and Hyflon and hydrophobic ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (BMI-TFSI) has been investigated by small-angle X-ray scattering (SAXS). Proton conductivity results of SLMs before and after leaching show an increase in conductivity with temperature up to 160 °C in an anhydrous environment. DSC results show that crystallites within perfluorinated membranes are thermally stable up to 196 °C. High-temperature SAXS results have been used to correlate structure and morphology of supported liquid membranes with high-temperature conductivity data. The ionic liquid essentially acts as a proton solvent in a similar way to water in hydrated Nafion membranes and increases size of clusters, which allow percolation to be achieved more easily. The cation of the ionic liquid interacts with sulfonate groups within ionic domains through electrostatic interactions and displaces protons. Protons can associate with free anions of the ionic liquid, which are loosely associated with cations and can transport by hopping from anion sites within the membrane. The ionic liquid contributes to proton conductivity at high temperature through achievement of long-range ordering and subsequent percolation.
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Affiliation(s)
- Mayur K Mistry
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, SA 5095, Australia
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Djordjevic I, Choudhury NR, Dutta NK, Kumar S, Szili EJ, Steele DA. Polyoctanediol citrate/sebacate bioelastomer films: surface morphology, chemistry and functionality. J Biomater Sci Polym Ed 2010; 21:237-51. [PMID: 20092687 DOI: 10.1163/156856209x415558] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Elastomeric polyesters synthesized from non-toxic and biocompatible reactants are topical research materials for tissue-engineering applications. In such applications, the morphology, chemistry and functionality of the materials surfaces play a key role. While a number of papers have focused and reported on the fabrication and biological evaluation of elastic polyesters, only a few have attempted to characterise the surfaces of such materials. In this paper, we report on the preparation and surface characterization of films of a co-polyester bioelastomer, polyoctanediol citrate/sebacate (p(OCS)). The co-polymer was synthesized following the standard procedure of polyesterification using three non-toxic monomers (1,8-octanediol, citric acid and sebacic acid) in a catalyst-free environment. Nuclear magnetic resonance spectroscopy was used to monitor the chemical composition of the various p(OCS) elastomers. The p(OCS) films, prepared by both spin-coating and solvent casting of the p(OCS) pre-polymer solutions, were characterized by scanning electron microscopy, UV-Vis titration, photo-acoustic Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy, and tested for their cytocompatibility. The results obtained suggest that the surface morphology, chemistry and the concentration of the surface functional groups can be controlled by simply varying the initial acid concentration (citric/sebacic acids) in the pre-polymer. The films supported the attachment and proliferation of osteoblast-like cells (MG63). This unique approach provides an effective method of controlling and monitoring the fundamental p(OCS) surface properties important for their potential utilisation as a tissue-engineering material.
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Affiliation(s)
- Ivan Djordjevic
- Ian Wark Research Institute, University of South Australia, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia
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Kannan AG, Choudhury NR, Dutta NK. Electrochemical performance of sol–gel derived phospho-silicate-methacrylate hybrid coatings. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.01.016] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [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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