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      Preparation and Tribological Study of Biodegradable Lubrication Films on Si Substrate

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          Abstract

          A novel method for preparing eco-biodegradable lubricant based on hydroxypropyl methylcellulose (HPMC) via hydration process is demonstrated. The smooth and homogeneous HPMC coating has a uniform thickness (~35 μm). It has been demonstrated that the preparation parameters play a critical role in controlling the lubricating behavior of the coating; in addition, excess HPMC and water concentration suppress the tribology properties. Nevertheless, a remarkable friction-reduction and anti-wear performance has been obtained. Impressively, the preparation parameter of 5% HPMC + 30 mL water significantly improves lubricant performance and durability. A simple approach for the water-degradability evaluation of HPMC is proposed.

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          Frictional characteristics of atomically thin sheets.

          Changgu Lee, Qunyang Li, William Kalb … (2010)
          Using friction force microscopy, we compared the nanoscale frictional characteristics of atomically thin sheets of graphene, molybdenum disulfide (MoS2), niobium diselenide, and hexagonal boron nitride exfoliated onto a weakly adherent substrate (silicon oxide) to those of their bulk counterparts. Measurements down to single atomic sheets revealed that friction monotonically increased as the number of layers decreased for all four materials. Suspended graphene membranes showed the same trend, but binding the graphene strongly to a mica surface suppressed the trend. Tip-sample adhesion forces were indistinguishable for all thicknesses and substrate arrangements. Both graphene and MoS2 exhibited atomic lattice stick-slip friction, with the thinnest sheets possessing a sliding-length-dependent increase in static friction. These observations, coupled with finite element modeling, suggest that the trend arises from the thinner sheets' increased susceptibility to out-of-plane elastic deformation. The generality of the results indicates that this may be a universal characteristic of nanoscale friction for atomically thin materials weakly bound to substrates.
          Article 0 comments Cited 355 times – based on 0 reviews     Review now
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            Friction and dissipation in epitaxial graphene films.

            Anja Horn, Th Seyller, R Bennewitz … (2009)
            We have studied friction and dissipation in single and bilayer graphene films grown epitaxially on SiC. The friction on SiC is greatly reduced by a single layer of graphene and reduced by another factor of 2 on bilayer graphene. The friction contrast between single and bilayer graphene arises from a dramatic difference in electron-phonon coupling, which we discovered by means of angle-resolved photoemission spectroscopy. Bilayer graphene as a lubricant outperforms even graphite due to reduced adhesion.
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              Materials, designs, and operational characteristics for fully biodegradable primary batteries.

              Lan Yin, Guo-Xian Huang, Hangxun Xu … (2014)
              Article 0 comments Cited 101 times – based on 0 reviews     Review now
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                Author and article information

                Contributors
                Wen-Hsiang Hsieh: Role: Academic Editor
                Journal
                Journal ID (nlm-ta): Materials (Basel)
                Journal ID (iso-abbrev): Materials (Basel)
                Journal ID (publisher-id): materials
                Title: Materials
                Publisher: MDPI
                ISSN (Electronic): 1996-1944
                Publication date (Electronic): 14 April 2015
                Publication date Collection: April 2015
                Volume: 8
                Issue: 4
                Pages: 1738-1751
                Affiliations
                Department of Mechanical Engineering, National Cheng Kung University (NCKU), No.1 University Road, Tainan 70101, Taiwan; E-Mails: N16031760@ 123456mail.ncku.edu.tw (T.-F.H.); N16031794@ 123456mail.ncku.edu.tw (J.-Y.W.)
                Author notes
                [* ] Author to whom correspondence should be addressed; E-Mail: scshi@ 123456mail.ncku.edu.tw ; Tel.: +886-6-275-7575 (ext. 62176); Fax: +886-6-235-2973.
                Article
                Publisher ID: materials-08-01738
                DOI: 10.3390/ma8041738
                PMC ID: 5507024
                SO-VID: 97d70371-09d2-4ed7-8bac-128a9e633a6e
                Copyright © © 2015 by the authors;
                License:

                licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 30 January 2015
                Date accepted : 07 April 2015
                Categories
                Subject: Article

                Keywords: green,tribology,water-degradable,hydroxypropyl methylcellulose,hpmc,lubrication,friction coefficient,wear,ball-on-disk
                Data availability:
                Keywords: green, tribology, water-degradable, hydroxypropyl methylcellulose, hpmc, lubrication, friction coefficient, wear, ball-on-disk

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