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Full-Text Articles in Engineering
Controlled Hydrogenation Into Defective Interlayer Bismuth Oxychloride Via Vacancy Engineering, Dandan Cui, Kang Xu, Xingan Dong, Dongdong Lv, Fan Dong, Weichang Hao, Yi Du, Jun Chen
Controlled Hydrogenation Into Defective Interlayer Bismuth Oxychloride Via Vacancy Engineering, Dandan Cui, Kang Xu, Xingan Dong, Dongdong Lv, Fan Dong, Weichang Hao, Yi Du, Jun Chen
Australian Institute for Innovative Materials - Papers
Hydrogenation is an effective approach to improve the performance of photocatalysts within defect engineering methods. The mechanism of hydrogenation and synergetic effects between hydrogen atoms and local electronic structures, however, remain unclear due to the limits of available photocatalytic systems and technical barriers to observation and measurement. Here, we utilize oxygen vacancies as residential sites to host hydrogen atoms in a layered bismuth oxychloride material containing defects. It is confirmed theoretically and experimentally that the hydrogen atoms interact with the vacancies and surrounding atoms, which promotes the separati30on and transfer processes of photo-generated carriers via the resulting band structure. The …
Electronic Structure Engineering Of Licoo2 Toward Enhanced Oxygen Electrocatalysis, Xiaobo Zheng, Yaping Chen, Xusheng Zheng, Guoqiang Zhao, Kun Rui, Peng Li, Xun Xu, Zhenxiang Cheng, Shi Xue Dou, Wenping Sun
Electronic Structure Engineering Of Licoo2 Toward Enhanced Oxygen Electrocatalysis, Xiaobo Zheng, Yaping Chen, Xusheng Zheng, Guoqiang Zhao, Kun Rui, Peng Li, Xun Xu, Zhenxiang Cheng, Shi Xue Dou, Wenping Sun
Australian Institute for Innovative Materials - Papers
Developing low-cost and efficient electrocatalysts for the oxygen evolution reaction and oxygen reduction reaction is of critical significance to the practical application of some emerging energy storage and conversion devices (e.g., metal-air batteries, water electrolyzers, and fuel cells). Lithium cobalt oxide is a promising nonprecious metal-based electrocatalyst for oxygen electrocatalysis; its activity, however, is still far from the requirements of practical applications. Here, a new LiCoO 2 -based electrocatalyst with nanosheet morphology is developed by a combination of Mg doping and shear force-assisted exfoliation strategies toward enhanced oxygen reduction and evolution reaction kinetics. It is demonstrated that the coupling effect …
3d Scaffolds Of Polycaprolactone/Copper-Doped Bioactive Glass: Architecture Engineering With Additive Manufacturing And Cellularassessments In A Coculture Of Bone Marrow Stem Cells And Endothelial Cells, Xiaoju Wang, Binbin Zhang, Sanna Pitkanen, Miina Ojansivu, Chunlin Xu, Markus Hannula, Jari A. Hyttinen, Susanna S. Miettinen, Leena Hupa, Gordon G. Wallace
3d Scaffolds Of Polycaprolactone/Copper-Doped Bioactive Glass: Architecture Engineering With Additive Manufacturing And Cellularassessments In A Coculture Of Bone Marrow Stem Cells And Endothelial Cells, Xiaoju Wang, Binbin Zhang, Sanna Pitkanen, Miina Ojansivu, Chunlin Xu, Markus Hannula, Jari A. Hyttinen, Susanna S. Miettinen, Leena Hupa, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
The local delivery of Cu2+ from copper-doped bioactive glass (Cu-BaG) was combined with 3D printing of polycaprolactone (PCL) scaffolds for its potent angiogenic effect in bone tissue engineering. PCL and Cu-BaG were, respectively, dissolved and dispersed in acetone to formulate a moderately homogeneous ink. The PCL/Cu-BaG scaffolds were fabricated via direct ink writing into a cold ethanol bath. The architecture of the printed scaffolds, including strut diameter, strut spacing, and porosity, were investigated and characterized. The PCL/Cu-BaG scaffolds showed a Cu-BaG content-dependent mechanical property, as the compressive Young's modulus ranged from 7 to 13 MPa at an apparent porosity of …
Structural Engineering Of Hierarchical Micro‐Nanostructured Ge-C Framework By Controlling The Nucleation For Ultralong Life Li Storage, Shilin Zhang, Yang Zheng, Xuejuan Huang, Jian Hong, Bin Cao, Junnan Hao, Qining Fan, Tengfei Zhou, Zaiping Guo
Structural Engineering Of Hierarchical Micro‐Nanostructured Ge-C Framework By Controlling The Nucleation For Ultralong Life Li Storage, Shilin Zhang, Yang Zheng, Xuejuan Huang, Jian Hong, Bin Cao, Junnan Hao, Qining Fan, Tengfei Zhou, Zaiping Guo
Australian Institute for Innovative Materials - Papers
The rational design of a proper electrode structure with high energy and power densities, long cycling lifespan, and low cost still remains a significant challenge for developing advanced energy storage systems. Germanium is a highly promising anode material for high-performance lithium ion batteries due to its large specific capacity and remarkable rate capability. Nevertheless, poor cycling stability and high price significantly limit its practical application. Herein, a facile and scalable structural engineering strategy is proposed by controlling the nucleation to fabricate a unique hierarchical micro-nanostructured Ge-C framework, featuring high tap density, reduced Ge content, superb structural stability, and a 3D …
Engineering Surface Amine Modifiers Of Ultrasmall Gold Nanoparticles Supported On Reduced Graphene Oxide For Improved Electrochemical Co2 Reduction, Yong Zhao, Caiyun Wang, Yuqing Liu, Douglas R. Macfarlane, Gordon G. Wallace
Engineering Surface Amine Modifiers Of Ultrasmall Gold Nanoparticles Supported On Reduced Graphene Oxide For Improved Electrochemical Co2 Reduction, Yong Zhao, Caiyun Wang, Yuqing Liu, Douglas R. Macfarlane, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Ultrasmall gold (Au) nanoparticles with high mass activity have great potential for practical applications in CO2electroreduction. However, these nanoparticles often suffer from poor product selectivity since their abundant low-coordinated sites are favorable for H2evolution. In this work, a catalyst, reduced graphene oxide supported ultrasmall Au nanoparticles (≈2.4 nm) is developed which delivers high Au-specific mass activities (>100 A g-1) and good Faradaic efficiencies (32-60%) for the CO2-to-CO conversion at moderate overpotentials (450-600 mV). The efficiencies can be improved to 59-75% while retaining the ultrahigh mass activities via a simple amine-modification strategy. In addition, an amine-structure-dependent effect is revealed: linear …
Design And Engineering Of Water-Soluble Light-Harvesting Protein Maquettes, Goutham Kodali, Joshua A. Mancini, Lee A. Solomon, Tatiana V. Episova, Nicholas Roach, Christopher Hobbs, Pawel W. Wagner, Olga Mass, Kunche Aravindu, Jonathan E. Barnsley, Keith C. Gordon, David L. Officer, P. Leslie Dutton, Christopher C. Moser
Design And Engineering Of Water-Soluble Light-Harvesting Protein Maquettes, Goutham Kodali, Joshua A. Mancini, Lee A. Solomon, Tatiana V. Episova, Nicholas Roach, Christopher Hobbs, Pawel W. Wagner, Olga Mass, Kunche Aravindu, Jonathan E. Barnsley, Keith C. Gordon, David L. Officer, P. Leslie Dutton, Christopher C. Moser
Australian Institute for Innovative Materials - Papers
Natural selection in photosynthesis has engineered tetrapyrrole based, nanometer scale, light harvesting and energy capture in light-induced charge separation. By designing and creating nanometer scale artificial light harvesting and charge separating proteins, we have the opportunity to reengineer and overcome the limitations of natural selection to extend energy capture to new wavelengths and to tailor efficient systems that better meet human as opposed to cellular energetic needs. While tetrapyrrole cofactor incorporation in natural proteins is complex and often assisted by accessory proteins for cofactor transport and insertion, artificial protein functionalization relies on a practical understanding of the basic physical chemistry …
Engineering Hierarchical Hollow Nickel Sulfide Spheres For High-Performance Sodium Storage, Dan Zhang, Wenping Sun, Yu Zhang, Yuhai Dou, Yinzhu Jiang, Shi Xue Dou
Engineering Hierarchical Hollow Nickel Sulfide Spheres For High-Performance Sodium Storage, Dan Zhang, Wenping Sun, Yu Zhang, Yuhai Dou, Yinzhu Jiang, Shi Xue Dou
Australian Institute for Innovative Materials - Papers
Sodium-ion batteries (SIBs) are considered as promising alternatives to lithium-ion batteries (LIBs) for energy storage due to the abundance of sodium, especially for grid distribution systems. The practical implementation of SIBs, however, is severely hindered by their low energy density and poor cycling stability due to the poor electrochemical performance of the existing electrodes. Here, to achieve high-capacity and durable sodium storage with good rate capability, hierarchical hollow NiS spheres with porous shells composed of nanoparticles are designed and synthesized by tuning the reaction parameters. The formation mechanism of this unique structure is systematically investigated, which is clearly revealed to …
Boosting The Efficiency Of Quantum Dot Sensitized Solar Cells Up To 7.11% Through Simultaneous Engineering Of Photocathode And Photoanode, Yang Bai, Chao Han, Xinqi Chen, Hua Yu, Xu Zong, Zhen Li, Lianzhou Wang
Boosting The Efficiency Of Quantum Dot Sensitized Solar Cells Up To 7.11% Through Simultaneous Engineering Of Photocathode And Photoanode, Yang Bai, Chao Han, Xinqi Chen, Hua Yu, Xu Zong, Zhen Li, Lianzhou Wang
Australian Institute for Innovative Materials - Papers
We demonstrate a new strategy of boosting the efficiency of quantum dot sensitized solar cells (QDSSCs) by engineering the photocathode and photoanode simultaneously. Nanostructured photocathodes based on non-stoichiometric Cu2-xSe electrocatalysts were developed via a simple and scalable approach for CdS/CdSe QDs co-sensitized solar cells. Compared to Cu2S CE, remarkably improved photovoltaic performance was achieved for QDSSCs with Cu2-xSe CEs. The superior catalytic activity and electrical conductivity of Cu2-xSe CEs were verified by the electrochemical impedance spectra and Tafel-polarization measurements. To maximize the efficiency enhancement, the photoanodes were optimized by introducing a pillared …
Surface Engineering And Design Strategy For Surface-Amorphized Tio 2 @Graphene Hybrids For High Power Li-Ion Battery Electrodes, Tengfei Zhou, Yang Zheng, Hong Gao, Shudi Min, Sean Li, Hua-Kun Liu, Zaiping Guo
Surface Engineering And Design Strategy For Surface-Amorphized Tio 2 @Graphene Hybrids For High Power Li-Ion Battery Electrodes, Tengfei Zhou, Yang Zheng, Hong Gao, Shudi Min, Sean Li, Hua-Kun Liu, Zaiping Guo
Australian Institute for Innovative Materials - Papers
Electrode materials with battery-like high capacity and capacitorlike rate performance are highly desirable, since they would signifi cantly advance next-generation energy storage technology. [ 1 ] TiO 2 has received increasing attention as an anode material for lithium-ion batteries (LIBs) due to its good reversible capacity and low volume expansion upon lithiation, as well as its low cost and safe lithiation potential. [ 2 ] The low lithium-ion mobility within the crystalline phase TiO 2 , however, together with its poor electrical conductivity, means that only a thin surface layer of the host material is available for Li intercalation at …
Electrical Stimulation Using Conductive Polymer Polypyrrole Promotes Differentiation Of Human Neural Stem Cells: A Biocompatible Platform For Translational Neural Tissue Engineering, Elise Stewart, Nao R. Kobayashi, Michael J. Higgins, Anita Quigley, Sina S. Jamali, Simon Moulton, Robert M. I Kapsa, Gordon G. Wallace, Jeremy M. Crook
Electrical Stimulation Using Conductive Polymer Polypyrrole Promotes Differentiation Of Human Neural Stem Cells: A Biocompatible Platform For Translational Neural Tissue Engineering, Elise Stewart, Nao R. Kobayashi, Michael J. Higgins, Anita Quigley, Sina S. Jamali, Simon Moulton, Robert M. I Kapsa, Gordon G. Wallace, Jeremy M. Crook
Australian Institute for Innovative Materials - Papers
Conductive polymers (CPs) are organic materials that hold great promise for biomedicine. Potential applications include in vitro or implantable electrodes for excitable cell recording and stimulation, and conductive scaffolds for cell support and tissue engineering. Here we demonstrate the utility of electroactive CP Polypyrrole (PPy) containing the anionic dopant dodecylbenzenesulfonate (DBS) to differentiate novel clinically relevant human neural stem cells (hNSCs). Electrical stimulation of PPy(DBS) induced hNSCs to predominantly β-III Tubulin (Tuj1) expressing neurons, with lower induction of glial fibrillary acidic protein (GFAP) expressing glial cells. In addition, stimulated cultures comprised nodes or clusters of neurons with longer neurites and …
Processable Conducting Graphene/Chitosan Hydrogels For Tissue Engineering, Sepidar Sayyar, Eoin Murray, Brianna Thompson, Johnson Chung, David L. Officer, Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace
Processable Conducting Graphene/Chitosan Hydrogels For Tissue Engineering, Sepidar Sayyar, Eoin Murray, Brianna Thompson, Johnson Chung, David L. Officer, Sanjeev Gambhir, Geoffrey M. Spinks, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Composites of graphene in a chitosan-lactic acid matrix were prepared to create conductive hydrogels that are processable, exhibit tunable swelling properties and show excellent biocompatibility. The addition of graphene to the polymer matrix also resulted in significant improvements to the mechanical strength of the hydrogels, with the addition of just 3 wt% graphene resulting in tensile strengths increasing by over 200%. The composites could be easily processed into three-dimensional scaffolds with finely controlled dimensions using additive fabrication techniques and fibroblast cells demonstrate good adhesion and growth on their surfaces. These chitosan-graphene composites show great promise for use as conducting substrates …
Performance Modulation Of Α-Mno2 Nanowires By Crystal Facet Engineering, W Li, Xiangyuan Cui, R Zeng, Guodong Du, Ziqi Sun, Rongkun Zheng, Simon Peter Ringer, S X. Dou
Performance Modulation Of Α-Mno2 Nanowires By Crystal Facet Engineering, W Li, Xiangyuan Cui, R Zeng, Guodong Du, Ziqi Sun, Rongkun Zheng, Simon Peter Ringer, S X. Dou
Australian Institute for Innovative Materials - Papers
Modulation of material physical and chemical properties through selective surface engineering is currently one of the most active research fields, aimed at optimizing functional performance for applications. The activity of exposed crystal planes determines the catalytic, sensory, photocatalytic, and electrochemical behavior of a material. In the research on nanomagnets, it opens up new perspectives in the fields of nanoelectronics, spintronics, and quantum computation. Herein, we demonstrate controllable magnetic modulation of α-MnO2 nanowires, which displayed surface ferromagnetism or antiferromagnetism, depending on the exposed plane. First-principles density functional theory calculations confirm that both Mn- and O-terminated α-MnO2 (1 …
In Situ Engineering Of Urchin-Like Reduced Graphene Oxide-Mn 2o3-Mn3o4 Nanostructures For Supercapacitors, Alfred Tawirirana Chidembo, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Charl Jeremy Jafta, Hua-Kun Liu, Kenneth Ikechukwu Ozoemena
In Situ Engineering Of Urchin-Like Reduced Graphene Oxide-Mn 2o3-Mn3o4 Nanostructures For Supercapacitors, Alfred Tawirirana Chidembo, Seyed Hamed Aboutalebi, Konstantin Konstantinov, Charl Jeremy Jafta, Hua-Kun Liu, Kenneth Ikechukwu Ozoemena
Australian Institute for Innovative Materials - Papers
We report the use of a spray pyrolysis method to synthesize high surface area (BET surface area of 139 m2 g-1) self-organized, micron sized urchin-like composites made up of reduced graphene oxide and needle-shaped manganese oxide (rGO-Mn2O3-Mn 3O4). Maximum capacitances of 425 Fg-1 at 5 mV s-1 from a three electrode set up and 133 Fg-1 at a current density of 0.2 Ag-1 were recorded using an asymmetric two electrode set up with graphene as the anode. The composite material also showed a capacitance retention of 83% over 1000 cycles. We attribute this remarkable performance to the high specific surface …
Extrusion Printed Graphene/Polycaprolactone/ Composites For Tissue Engineering, Sepidar Sayyar, Rhys Cornock, Eoin Murray, Stephen Beirne, David L. Officer, Gordon G. Wallace
Extrusion Printed Graphene/Polycaprolactone/ Composites For Tissue Engineering, Sepidar Sayyar, Rhys Cornock, Eoin Murray, Stephen Beirne, David L. Officer, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
In this work fibres and complex three-dimensional scaffolds of a covalently linked graphene-polycaprolactone composite were successfully extruded and printed using a melt extrusion printing system. Fibres with varying diameters and morphologies, as well as complex scaffolds were fabricated using an additive fabrication approach and were characterized. It was found that the addition of graphene improves the mechanical properties of the fibres by over 50% and in vitro cytotoxicity tests showed good biocompatibility indicating a promising material for tissue engineering applications.
Engineering A Multimodal Nerve Conduit For Repair Of Injured Peripheral Nerve, A F. Quigley, K J. Bulluss, I L. B Kyratzis, K Gilmore, T Mysore, K S U Schirmer, E L. Kennedy, M O'Shea, Y B. Truong, S L. Edwards, G Peeters, P Herwig, Joselito M. Razal, T E. Campbell, K N. Lowes, M J. Higgins, S E. Moulton, M A. Murphy, M J. Cook, G M. Clark, G G. Wallace, R M. I Kapsa
Engineering A Multimodal Nerve Conduit For Repair Of Injured Peripheral Nerve, A F. Quigley, K J. Bulluss, I L. B Kyratzis, K Gilmore, T Mysore, K S U Schirmer, E L. Kennedy, M O'Shea, Y B. Truong, S L. Edwards, G Peeters, P Herwig, Joselito M. Razal, T E. Campbell, K N. Lowes, M J. Higgins, S E. Moulton, M A. Murphy, M J. Cook, G M. Clark, G G. Wallace, R M. I Kapsa
Australian Institute for Innovative Materials - Papers
Injury to nerve tissue in the peripheral nervous system (PNS) results in long-term impairment of limb function, dysaesthesia and pain, often with associated psychological effects. Whilst minor injuries can be left to regenerate without intervention and short gaps up to 2 cm can be sutured, larger or more severe injuries commonly require autogenous nerve grafts harvested from elsewhere in the body (usually sensory nerves). Functional recovery is often suboptimal and associated with loss of sensation from the tissue innervated by the harvested nerve. The challenges that persist with nerve repair have resulted in development of nerve guides or conduits from …
Covalently Linked Biocompatible Graphene/Polycaprolactone Composites For Tissue Engineering, Sepidar Sayyar, Eoin Murray, Brianna C. Thompson, Sanjeev Gambhir, David L. Officer, Gordon G. Wallace
Covalently Linked Biocompatible Graphene/Polycaprolactone Composites For Tissue Engineering, Sepidar Sayyar, Eoin Murray, Brianna C. Thompson, Sanjeev Gambhir, David L. Officer, Gordon G. Wallace
Australian Institute for Innovative Materials - Papers
Two synthesis routes to graphene/polycaprolactone composites are introduced and the properties of the resulting composites compared. In the first method, mixtures are produced using solution processing of polycaprolactone and well dispersed, chemically reduced graphene oxide and in the second, an esterification reaction covalently links polycaprolactone chains to free carboxyl groups on the graphene sheets. This is achieved through the use of a stable anhydrous dimethylformamide dispersion of graphene that has been highly chemically reduced resulting in mostly peripheral ester linkages. The resulting covalently linked composites exhibit far better homogeneity and as a result, both Young's modulus and tensile strength more …
Living Fibres: 3d Hydrogel Fibres For Tissue Engineering, Anita Quigley, Magdalena Kita, Rhys Cornock, Tharun Mysore, Javad Foroughi, Gordon G. Wallace, Robert M. I Kapsa
Living Fibres: 3d Hydrogel Fibres For Tissue Engineering, Anita Quigley, Magdalena Kita, Rhys Cornock, Tharun Mysore, Javad Foroughi, Gordon G. Wallace, Robert M. I Kapsa
Australian Institute for Innovative Materials - Papers
To use rapid fibre spinning technologies for the creation of 3D constructs for cell delivery, tissue engineering and the study of 3D cellular interactions. This study describes the fabrication of biosynthetic soft gel fibers containing myoblasts and myogenic growth factors and their use for restoration of dystrophin expression in dystrophic mdx mouse muscle.
Precision Wet-Spinning Of Cell-Impregnated Alginate Fibres For Tissue Engineering, Rhys Cornock, Magdalena Kita, Anita Quigley, Gordon G. Wallace, Robert M. I Kapsa
Precision Wet-Spinning Of Cell-Impregnated Alginate Fibres For Tissue Engineering, Rhys Cornock, Magdalena Kita, Anita Quigley, Gordon G. Wallace, Robert M. I Kapsa
Australian Institute for Innovative Materials - Papers
The selective assembly of functionalised fibres produced by wet-spinning into implantable three dimensional contructs presents attractive prospects for the field of medical bionics[1]. In particular, the incorporation of biological factors and large numbers of cells within biocompatible and macroporous fibres is expected to deliver improvements to drug delivery platforms as well as to tissue engineering biotechnology[2, 3].