Article
Chemistry, Physical
Young Jin Cho, Md Shahjahan Kabir Chowdury, Ye Ji Park, Su Min Jeong, Sung Bum Park, Yong-il Park
Summary: Graphene oxide membrane (GOM) shows promising proton conductivity under wet conditions, but faces challenges compared to conventional membranes. In this study, a new fuel cell was developed by preparing hydrogen-permeable metal films and modifying graphene oxide electrolyte. The experimental results demonstrate that the fuel cell exhibits superior performance compared to traditional ones.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Song Wang, Daliang Zhang, Xiaohua Ma, Jiucong Liu, Yanli Chen, Yunfeng Zhao, Yu Han
Summary: By modifying a commercial ionic membrane with carbon dots, researchers were able to increase the purity of hydrogen produced from electrolysis of water to 99.98%, meeting the standards required for hydrogen fuel cells.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Yamei Sun, Jingyi Tian, Zhangyan Mu, Bailin Tian, Qiulan Zhou, Cheng Liu, Shengtang Liu, Qiang Wu, Mengning Ding
Summary: Solid-state ionic conductor is an essential component in electrochemical energy conversion devices. Nafion, widely used as a proton-conducting polymer and electrode stabilizer, plays a crucial role in electrochemical devices operating under acidic conditions. In this study, in situ electrical transport spectroscopy (ETS) was employed to investigate the adsorption of Nafion on Pt catalysts and its effects on oxygen reduction reaction (ORR) intermediates. The results show that specific adsorption of Nafion increases the coverage of oxygen intermediates with weaker adsorption strength, which in turn influences the reaction selectivity.
SCIENCE CHINA-CHEMISTRY
(2022)
Article
Chemistry, Physical
S. S. Awulachewa, K. N. Nigussa
Summary: The proton transport property was studied by analyzing the intermolecular pair correlation functions of the proton ion with the electrolyte and a novel electrode in a polymer electrolyte fuel cell. Molecular dynamics simulation was carried out using Materials-Studio. The results showed that considering the interaction effects of the proton with both the electrolyte and the electrode increased the proton conductivity values compared to considering the interaction effects with the electrolyte alone. The proton transport pathway was found to be through the network of hydrogen bonds via bond creating and breaking processes. The ion conductivities of the benchmark Pt electrode and the novel Pd3Ag electrode were calculated to be 7.92 S/cm and 3.36 S/cm, respectively. It was suggested that using Pd3Ag electrode and nafion polymer electrolyte could be a cost-effective and efficient design for a new PEMFC.
CHEMICAL PHYSICS LETTERS
(2023)
Correction
Chemistry, Multidisciplinary
Tatyana Reshetenko, Andrei Kulikovsky
Summary: The study investigates the transport properties of Nafion film in a low-Pt PEM fuel cell through impedance spectroscopy.
Article
Chemistry, Analytical
Zinan Zhi, Wanshuo Gao, Jiawei Yang, Chong Geng, Boxuan Yang, Chen Tian, Shurui Fan, Haoyi Li, Jinpo Li, Zhongqiu Hua
Summary: In this study, an amperometric electrochemical hydrogen sensor was developed using solid polymer electrolyte and screen-printed electrodes (SPE). The sensitivity was enhanced by modifying the carbon electrode with a Pt/C/Nafion film. It was shown that the electrochemical behavior of hydrogen and Pt nanoparticles involved single electron transfer in an anaerobic environment and coupling with oxygen in an aerobic environment. A solid amperometric gas sensor was also fabricated using 3D printing, a solid polymer electrolyte, and modified electrodes, resulting in a simple device fabrication process with significantly improved sensitivity.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Engineering, Environmental
Yang Yang, Jun Li, Wei Yang, Yingrui Yang, Qian Fu, Liang Zhang, Qiang Liao, Xun Zhu
Summary: The study introduces a method to improve hydrogen evolution reaction by using an open-structured carbon fiber brush electrode and fabricating an HER electrode with MoS2 perpendicular to CFB. This structure helps to ensure uniform distribution of electrocatalyst, enhance exposure of active sites, and guarantee reaction ion supply.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Ruggero Rossi, Derek M. Hall, Le Shi, Nicholas R. Cross, Christopher A. Gorski, Michael A. Hickner, Bruce E. Logan
Summary: A new method using humidified gas stream for the anode and liquid saltwater catholyte is proposed to reduce chlorine generation and improve performance in hydrogen production. The charge repulsion of chloride ions by the proton exchange membrane results in lower chlorine generation and high faradaic efficiencies for oxygen evolution. This vapor-fed anode configuration allows for direct use of saltwater in conventional electrolyzers without additional water purification.
ENERGY & ENVIRONMENTAL SCIENCE
(2021)
Article
Chemistry, Physical
Yasuhiro Shiraishi, Airu Soramoto, Satoshi Ichikawa, Shunsuke Tanaka, Takayuki Hirai
Summary: This study reports a visible light-irradiated Nafion-coated graphene quantum dots/carbon nitride photocatalyst that promotes the splitting of H2O2, resulting in the generation of H2. The Nafion layer on the catalyst surface acts as an impermeable membrane for H2O2 but allows the permeation of H+, facilitating the reduction of H+ and suppressing the reduction of H2O2.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2022)
Article
Green & Sustainable Science & Technology
Camila Padovan, Julia A. G. Fagundes, Marcio de Almeida D'Agosto, Ana Carolina M. Angelo, Pedro J. P. Carneiro
Summary: Brazilian researchers are seeking cleaner energy alternatives for the transportation sector in order to meet GHG reduction targets. The study compared diesel-powered internal combustion buses with a hydrogen-powered polymer fuel cell hybrid bus, considering different hydrogen production methods. The results showed that diesel had the highest emissions and fossil energy consumption, while water electrolysis had the lowest emissions among the hydrogen production alternatives.
Review
Chemistry, Physical
Paul C. Okonkwo, Ikram Ben Belgacem, Wilfred Emori, Paul C. Uzoma
Summary: Understanding the degradation mechanisms of the Nafion membrane in fuel cells is crucial for improving its performance, which can be achieved by fabricating and coating the membrane with materials that can withstand the electrochemical environment.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
Maria E. Mondejar, Maria Regidor, Joerg Krafczyk, Christian Ihmels, Bastian Schmid, Georgios M. Kontogeorgis, Fredrik Haglind
Summary: This paper describes the collection, scope, utility, and development of a comprehensive database of published experimental thermophysical properties of nanofluids. The database includes 307 datasets with 8118 data records covering 13 types of base fluids and 19 nanoparticle types. The first release of the database is accessible for free through the Dortmund Databank.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Electrochemistry
Michael A. Yandrasits, Sudha Marimannikkuppam, Matthew J. Lindell, Kyle A. Kalstabakken, Michael Kurkowski, Phuc Ha
Summary: Open circuit voltage tests and ion chromatography techniques were used to analyze 3M Ionomer and Nafion(TM) NR211 membranes. The dominant degradation mechanism was found to be the polymer chain end unzipping, while peroxide attack on the sulfonic acid side chain was less relevant. The extraction of tertiary fluorine from the NR211 backbone and side chain was also observed.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Energy & Fuels
C. Tsiklios, M. Hermesmann, T. E. Mueller
Summary: Implementing climate-friendly hydrogen as an energy carrier is a key strategy to achieve global climate targets. This study investigates the energy efficiency and environmental performance of hydrogen transport via pipeline through thermodynamic analysis and life cycle assessment. By adjusting key parameters, an energy-efficient and environmentally friendly hydrogen transport solution can be achieved, providing three measures for design and operation.
Article
Green & Sustainable Science & Technology
Sebastian Kolb, Jakob Muller, Natalia Luna-Jaspe, Jurgen Karl
Summary: Hydrogen imports are seen as a promising solution for the decarbonization of the German energy system. This study compares the environmental performance of liquefied hydrogen imports from Chile, Canada, and Morocco, and shows that renewable hydrogen imports can outperform domestic production in certain cases.
JOURNAL OF CLEANER PRODUCTION
(2022)
Review
Biochemistry & Molecular Biology
Aydin Bordbar-Khiabani, Michael Gasik
Summary: Smart hydrogels, a type of material that can respond to stimuli and adapt their responses based on external cues, have emerged as a promising research frontier in the field of biomedical engineering. With their high stability, physicochemical properties, and biocompatibility, smart hydrogels have the potential to be used in drug delivery systems. By changing their properties under external stimuli such as pH, temperature, electrical and magnetic fields, light, and biomolecules concentration, smart hydrogels can achieve controlled release of loaded drugs.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2022)
Article
Engineering, Manufacturing
A. Cunha, A. Marques, M. Gasik, B. Trindade
Summary: In this study, stainless steel samples were prepared by hot pressing at different temperatures, and the influence of the processing temperature on the properties of the samples was investigated. The results showed that dense samples could be obtained within the specified sintering temperature range, and the sintering temperature affected the density, grain size, structural phases, and hardness.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Review
Automation & Control Systems
Angela Cunha, Ana Marques, Mariana Rodrigues Silva, Flavio Bartolomeu, Filipe Samuel Silva, Michael Gasik, Bruno Trindade, Oscar Carvalho
Summary: This review provides a critical overview of the influence of laser powder bed fusion (LPBF) processing parameters on the final properties of steels used in the plastic injection mould industry, and presents a comprehensive summary and discussion of the physical, mechanical, tribological, corrosion, and thermal properties influenced by LPBF processing parameters.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Biomedical
M. M. Costa, R. Lima, N. Alves, N. A. Silva, M. Gasik, F. S. Silva, F. Bartolomeu, G. Miranda
Summary: In this study, mono-material and multi-material cellular structures were produced using SLM technique and characterized in terms of cell viability and tribological properties. The results showed improved metabolic activity and mineralization in SLM mono-material groups, and further enhancement in cell metrics with the addition of PEEK material.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Review
Materials Science, Multidisciplinary
Flavio Bartolomeu, Michael Gasik, Filipe Samuel Silva, Georgina Miranda
Summary: This review focuses on the mechanical properties of selective laser-melted Ti6Al4V parts and discusses the main processing and microstructural parameters that affect the final properties. It provides a fundamental understanding of the relationship between microstructural features and mechanical properties, including tensile strength, fatigue resistance, and wear performance. The review also compares Laser Powder Bed Fusion with conventional processing routes and discusses the presence of defects in as-built Ti6Al4V parts and their impact on mechanical performance.
Article
Materials Science, Multidisciplinary
A. Cunha, A. Marques, F. S. Silva, M. Gasik, B. Trindade, O. Carvalho, F. Bartolomeu
Summary: A novel multi-material design concept for plastic injection moulds, combining stainless steel alloy and copper, is proposed in this study. The concept involves fabricating a single component using homemade 3D Multi-Material Laser Powder Bed Fusion equipment. Analysis of the interface between the two materials shows a good metallurgical bonding and the presence of mechanical interlocking. The materials exhibit low porosity, except for some pores and cracks at the interface zone.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Automation & Control Systems
Angela Cunha, Ana Marques, Bruno Guimaraes, Flavio Bartolomeu, Filipe Samuel Silva, Michael Gasik, Bruno Trindade, Oscar Carvalho
Summary: The aim of this study was to develop a multi-functional surface for plastic injection moulds. A surface textured by laser and filled with pure copper by hot pressing was produced. The influence of pure copper on various properties was analyzed.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Automation & Control Systems
Ana Marques, Angela Cunha, Michael Gasik, Oscar Carvalho, Filipe Samuel Silva, Flavio Bartolomeu
Summary: A home-made 3D multi-material laser powder bed fusion (3DMMLPBF) system was used to successfully produce novel multi-material IN718-Cu parts with excellent metallurgical bonding and mechanical behavior. This innovative solution shows promising potential by combining the high strength of IN718 and the high thermal conductivity of Cu.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Engineering, Biomedical
F. Bartolomeu, O. Carvalho, M. Gasik, F. S. Silva
Summary: A home-made 3D Multi-Material Laser Powder Bed Fusion (3DMMLPBF) technology was used to manufacture novel multi-material Ti6Al4V-CoCrMo parts. This system allows for the construction of 3D Multi-Material transitions between distinct materials, point-by-point and layer-by-layer. The functional transition between Ti6Al4V and CoCrMo was analyzed and found to have a solid metallurgical bonding and 3D mechanical interlocking.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Aydin Bordbar-Khiabani, Michael Gasik
Summary: The presence of hydrogen peroxide affects the corrosion resistance of titanium biomaterials, while the synergistic action of hydrogen peroxide, albumin, and lactate under severe inflammatory conditions decreases the corrosion resistance. The TNZS alloy, with the addition of silicide phases, demonstrates superior corrosion resistance in all conditions and favorable biocompatibility in cell culture investigations, suggesting its potential as a competitive biomaterial for orthopedic applications.
SCIENTIFIC REPORTS
(2023)
Article
Engineering, Manufacturing
A. Marques, A. Cunha, M. Gasik, O. Carvalho, F. S. Silva, F. Bartolomeu
Summary: In this work, a homemade 3D multi-material laser powder bed fusion system (3D MMLPBF) was utilized to produce multi-functional Ti6Al4V-CuNi2SiCr parts. By using a layer-by-layer approach, a 3D multi-material component combining high mechanical strength (Ti6Al4V) and high thermal conductivity (CuNi2SiCr) could be fabricated at once. The study investigated the interaction, morphology, and mechanical behavior of each material in the 3D Ti6AL4V-CuNi2SiCr multi-material concept. The interface region of the fabricated specimens showed good mechanical interlocking and strong metallurgical bonding, with occasional defects such as pores or cracks. The Vickers' microhardness values of the Ti6Al4V and CuNi2SiCr zones were approximately 356 HV and 128 HV, respectively.
PROGRESS IN ADDITIVE MANUFACTURING
(2023)
Article
Biochemistry & Molecular Biology
Aydin Bordbar-Khiabani, Ilijana Kovrlija, Janis Locs, Dagnija Loca, Michael Gasik
Summary: In this study, alginate hydrogels with and without octacalcium phosphate (OCP) were fabricated on 3D-printed titanium alloys to improve their corrosion resistance in various simulated environments. The results showed that the OCP-laden alginate hydrogel exhibited higher hydrophilicity and increased crystallinity compared to pure alginate. Additionally, the OCP particles significantly enhanced the corrosion resistance of the coated samples. Therefore, this study is of great importance for improving the corrosion resistance of metallic implants.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Materials Science, Multidisciplinary
Aydin Bordbar-Khiabani, Michael Gasik
Summary: This study reports the electrochemical behavior of additively manufactured patterned titanium alloys in different simulated conditions. The corrosion resistance of titanium alloys increases with increasing immersion time in all cases. Under severe inflammatory conditions, albumin, lactate, and H2O2 have a synergistic effect on decreasing the corrosion resistance of patterned titanium layers.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Multidisciplinary
Beatriz Ferreira Fernandes, Neusa Silva, Joana Faria Marques, Mariana Brito Da Cruz, Laura Tiainen, Michael Gasik, Oscar Carvalho, Filipe Samuel Silva, Joao Carames, Antonio Mata
Summary: This in vitro study evaluated the cellular response of human osteoblasts, gingival fibroblasts, and S. oralis when in contact with zirconia implant surfaces functionalized with BaTiO3, which has piezoelectric properties. The results suggest that these surfaces are not cytotoxic to peri-implant cells and may promote faster initial osteoblast differentiation. Additionally, they can inhibit the growth of S. oralis over time by acting as a bacteriostatic agent.
Review
Engineering, Biomedical
F. Melo-Fonseca, O. Carvalho, M. Gasik, G. Miranda, F. S. Silva
Summary: Significant advancements in research and technology have led to remarkable findings on the physiological dynamics of the human body. The transition from two-dimensional culture systems to three-dimensional dynamic cultures has allowed for a closer mimic of the complex physiological environment. This review focuses on mechanical stimulation devices and their potential for improvement to enhance mechanobiology studies.
BIO-DESIGN AND MANUFACTURING
(2023)
