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Lubricants, Volume 2, Issue 3 (September 2014) – 3 articles , Pages 113-161

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Review
The Preparation of Graphene Oxide and Its Derivatives and Their Application in Bio-Tribological Systems
by Jianchang Li, Xiangqiong Zeng, Tianhui Ren and Emile Van der Heide
Lubricants 2014, 2(3), 137-161; https://doi.org/10.3390/lubricants2030137 - 24 Sep 2014
Cited by 132 | Viewed by 23527
Abstract
Graphene oxide (GO) can be readily modified for particular applications due to the existence of abundant oxygen-containing functional groups. Graphene oxide-based materials (GOBMs), which are biocompatible and hydrophilic, have wide potential applications in biomedical engineering and biotechnology. In this review, the preparation and [...] Read more.
Graphene oxide (GO) can be readily modified for particular applications due to the existence of abundant oxygen-containing functional groups. Graphene oxide-based materials (GOBMs), which are biocompatible and hydrophilic, have wide potential applications in biomedical engineering and biotechnology. In this review, the preparation and characterization of GO and its derivatives are discussed at first. Subsequently, the biocompatibility and tribological behavior of GOBMs are reviewed. Finally, the applications of GOBMs as lubricants in bio-tribological systems are discussed in detail. Full article
(This article belongs to the Special Issue Bio and Bio-Inspired Lubricants)
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816 KiB  
Article
Growth Control of Microbial in Miscible Cutting Fluids Using Ultraviolet Radiation
by Eduardo Carlos Bianchi, Paulo Roberto Aguiar, Olavo Speranza De Arruda and Francine Amaral Piubeli
Lubricants 2014, 2(3), 124-136; https://doi.org/10.3390/lubricants2030124 - 02 Sep 2014
Cited by 1 | Viewed by 4966
Abstract
Considering the issues involved in industrial cutting and machining systems, and, in particular, the problems arising from the use of cutting fluids in these systems, this study presents the results of an analysis that points to a safe and efficient way to reduce [...] Read more.
Considering the issues involved in industrial cutting and machining systems, and, in particular, the problems arising from the use of cutting fluids in these systems, this study presents the results of an analysis that points to a safe and efficient way to reduce contaminated microbial cutting fluids using ultraviolet radiation. The study proposes a transmitter system of simple ultraviolet radiation, safe and easy to obtain. The results of this study showed that the action of ultraviolet radiation on microorganisms in metalworking fluids is very effective and leads to a significant reduction of the load of microorganisms. In addition, no changes were observed during the experimental period that would lead to impairments in the performance of the activities of the cutting fluid used. Given the results, we can conclude that the use of ultraviolet radiation in the prevention and control of contamination is an important contribution to the durability of cutting fluids in machining and grinding operations. Full article
(This article belongs to the Special Issue Bio and Bio-Inspired Lubricants)
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911 KiB  
Review
Tribofilm Formation As a Result of Complex Interaction at the Tool/Chip Interface during Cutting
by German S. Fox-Rabinovich, Iosif Gershman, Mohamed A. El Hakim, Mohamed A. Shalaby, James E. Krzanowski and Stephen C. Veldhuis
Lubricants 2014, 2(3), 113-123; https://doi.org/10.3390/lubricants2030113 - 21 Jul 2014
Cited by 22 | Viewed by 6364
Abstract
Tribofilms are dynamic structures that form at the interface during frictional sliding. These films play a significant role in friction control, particularly under heavy loaded/high temperature conditions, such as those found at the cutting tool/chip interface. The thermodynamic aspects of tribofilm formation are [...] Read more.
Tribofilms are dynamic structures that form at the interface during frictional sliding. These films play a significant role in friction control, particularly under heavy loaded/high temperature conditions, such as those found at the cutting tool/chip interface. The thermodynamic aspects of tribofilm formation are discussed here. Thermodynamic analysis of entropy production during friction shows that there are two types of tribofilms that affect the wear behavior of a cutting tool: (1) tribofilms forming as a result of the surface modification of the cutting tools with further tribo-oxidation; and (2) tribofilms that form as a result of material transfer from the contacting frictional body (the workpiece) during the tool/chip interaction. Experimental examples are presented, outlining the beneficial role of both types of tribofilms. Full article
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