Article
Engineering, Chemical
Rok Simic, Nicholas D. Spencer
Summary: The study introduces a method for controlling the frictional properties of hydrogel surfaces by utilizing oxygen inhibition of the free-radical polymerization reaction, allowing for control over friction on a magnitude scale and spatial control, showcasing its universality and potential applications in various gel-based products.
Article
Engineering, Chemical
Tobias A. Gmuer, Joydeb Mandal, Juliette Cayer-Barrioz, Nicholas D. Spencer
Summary: A macromolecular design approach was used to synthesize a series of block copolymers for friction reduction, with those having roughly equal block lengths and moderate molecular weights proving significantly more effective. These polymers formed thin films of around 17 nm thickness on surfaces, indicating the formation of a polymer brush.
Article
Materials Science, Multidisciplinary
Elio Fiorito, Marzia Fantauzzi, Laura Brundu, Davide Atzei, Bernhard Elsener, Antonella Rossi
Summary: The study utilized powdered marble waste as a sorbent to effectively remove lead and manganese from model solutions, providing valuable insights for the development of water purification methods and analytical strategies.
Article
Environmental Sciences
Elio Fiorito, Giovanni E. Porcedda, Laura Brundu, Cristiana Passiu, Davide Atzei, Guido Ennas, Bernhard Elsener, Marzia Fantauzzi, Antonella Rossi
Summary: This study investigates the sorption mechanism of calcite on lead ions and finds that calcite can effectively remove lead ions from wastewater within a wide range of initial concentrations.
Article
Green & Sustainable Science & Technology
Ankit Saxena, Deepak Kumar, Naresh Tandon
Summary: The grease industry extensively uses harmful ingredients that harm the environment, but a potential alternative has not yet been found. This study explores the use of bio-polymers as additives to enhance the performance of eco-friendly greases. The results show that one bio-polymer significantly improves the anti-wear and friction characteristics of the grease, while the other performs poorly, due to their distinct interaction tendencies with organoclay.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Chemistry, Multidisciplinary
Sebastien Delamarre, Tobias Gmur, Nicholas D. Spencer, Juliette Cayer-Barrioz
Summary: This study investigates the correlation between adsorption and lubricity using polymeric friction modifiers. Through various measurements, it is found that the molecular organization and mechanical properties of the boundary layers play a crucial role in friction behavior.
Article
Materials Science, Multidisciplinary
Deborah Biggio, Bernhard Elsener, Davide Atzei, Antonella Rossi, Marzia Fantauzzi
Summary: The composition of natural saliva is highly variable and unstable outside the oral cavity, leading to the use of artificial saliva solutions in corrosion testing. This study investigates the corrosion behavior of a CuZn37 alloy exposed to different saliva solutions with varying compositions. The results show that the corrosion rate of the alloy is influenced by the different saliva solutions, and the presence of organic compounds may limit the formation of a protective surface film.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2023)
Article
Chemistry, Physical
Deborah Biggio, Marzia Fantauzzi, Bernhard Elsener, Davide Atzei, Antonella Rossi
Summary: This study investigates the effect of different saliva formulations on the composition of the surface film formed on CuZn37 brass alloy. The results suggest that the presence of organic compounds leads to corrosion of the surface film.
SURFACE AND INTERFACE ANALYSIS
(2023)
Article
Materials Science, Ceramics
Abhijit Pattnayak, Avi Gupta, N. Abhijith, Deepak Kumar
Summary: The present study introduces a novel and effective single-step thermal spray coating process called 'Hybridized-Flow Flame Spray (HFFS) process'. This process is specifically designed to develop ceramic coatings with superior properties compared to conventional Powder Flame Spray (PFS) coatings. Physical, mechanical, and metallurgical analyses were conducted on both PFS and HFFS coatings using various measurement techniques. The results show significant improvements in density, hardness, coating thickness, and surface roughness for the HFFS sprayed coatings compared to PFS coatings, which can be attributed to the densification of the coating structure and improved microstructural changes due to the hybridized flow in the HFFS process.
CERAMICS INTERNATIONAL
(2023)
Article
Agricultural Engineering
Sakshi Shrivastava, Pooja Prajapati, Virendra, Priyanka Srivastava, Ajay P. S. Lodhi, Deepak Kumar, Varsha Sharma, S. K. Srivastava, D. D. Agarwal
Summary: This study developed a novel method for the production of fatty acid alkyl esters and TFATE-based biolubricants from vegetable oils using Zn Al hydrotalcite as a heterogeneous catalyst. High yields of biolubricant were obtained under specific chemical conditions, and the Zn Al hydrotalcite was analyzed using various techniques. The resulting biolubricant exhibited excellent tribological properties, with the lowest coefficient of friction.
INDUSTRIAL CROPS AND PRODUCTS
(2023)
Article
Materials Science, Ceramics
Abhijit Pattnayak, Avi Gupta, N. V. Abhijith, Deepak Kumar, Jayant Jain, V. Chaudhry
Summary: This study focuses on the development of hard, wear-resistant ceramic-based coatings containing Alumina (Al2O3) doped with 0.8% Ceria (CeO2) and reduced graphene oxide (rGO, 0-0.2%) on 17-4 PH steel using High -Velocity Oxygen Fuel (HVOF) thermal spray process. The addition of rGO improves the coatings' friction coefficient and corrosion response. The Al2O3-CeO2-rGO coating exhibits higher elastic modulus, nano hardness, and lower specific wear rate compared to the Al2O3-CeO2 coating and 17-4 PH steel.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Alessandro Pacella, Paolo Ballirano, Maria Cristina Di Carlo, Marzia Fantauzzi, Antonella Rossi, Elisa Nardi, Cecilia Viti, Lorenzo Arrizza, Antonella Campopiano, Annapaola Cannizzaro, Andrea Bloise, Maria Rita Montereali
Summary: This study focuses on the dissolution process and surface characterization of amosite fibres in interaction with a mimicked Gamble's solution. The results show that amosite fibres exhibit similar dissolution behavior as asbestos tremolite and UICC crocidolite, with preferential release of Mg and Ca and no Fe release detected. Surface oxidation and erosion were also observed. Understanding the surface alteration of asbestos is important for understanding its long-term toxicity.
Meeting Abstract
Oncology
Jeffrey J. Kovacs, Nakia D. Spencer, Christopher A. Bristow, Alessandro Carugo, Virginia Giluiani, Meredith A. Miller, Angela Harris, Ningping Feng, Michael L. Soth, Kang Le, Elisa de Stanchina, Charles M. Rudin, Giulio Draetta, Timothy A. Yap, Philip Jones, Timothy Heffernan
Article
Chemistry, Physical
Rok Simic, Joydeb Mandal, Kaihuan Zhang, Nicholas D. Spencer
Summary: In this study, it was demonstrated that some molding materials release oxygen during polymerization, inhibiting free-radical polymerization near the interface. Removal of oxygen from the system resulted in homogeneously cross-linked hydrogel surfaces, allowing for the controlled adjustment of surface structures and mechanical properties through the regulation of oxygen levels.
Article
Chemistry, Physical
Ahmet F. Demirors, Alex Stauffer, Carmen Lauener, Jacopo Cossu, Shivaprakash N. Ramakrishna, Joost de Graaf, Carlos C. J. Alcantara, Salvador Pane, Nicholas Spencer, Andre R. Studart
Summary: Precise control over the motion of magnetically driven Janus colloids on solid substrates is achieved through electrically induced attractive interactions, allowing manipulation of forward velocity. Experimental data suggest a transition in frictional coupling from a hydrodynamic regime to mixed contact coupling with increasing load force. These colloidal microrobots can probe the local friction coefficient of various solid surfaces and are able to manipulate porous cargos, showing promise for bio-analytical applications.
