Tungsten disulfide inorganic nanotubes functionalized by ptfe for friction application

Tzuriel Levin; Yifat Harel; Jean Paul Lellouche; Alexey Moshkovich; Igor Lapsker; Alex Laikhtman; Lev Rapoport

doi:10.3390/lubricants9080078

Tungsten disulfide inorganic nanotubes functionalized by ptfe for friction application

Tzuriel Levin, Yifat Harel, Jean Paul Lellouche, Alexey Moshkovich, Igor Lapsker, Alex Laikhtman, Lev Rapoport

Department of Chemistry

Bar-Ilan University

Research output: Contribution to journal › Article › peer-review

Abstract

Inorganic nanotubes (INTs) and fullerene‐like nanoparticles (NPs) of WS2/MoS2 penetrate and exfoliate at the contact interface and facilitate tribofilm formation. While the tribological properties are greatly improved by exfoliated NPs that shed easily, they may be diminished by agglomeration in oil. Therefore, surface functionalization is employed to improve dispersion in oil‐based suspensions. Here, WS2 INTs were functionalized by polytetrafluoroethylene (PTFE) in a simple and cost‐effective bath sonication method. WS2‐INTs with two concentrations of added PTFE were characterized by scanning and transmission electron microscopy, micro‐Raman spectroscopy, and thermogravimetric analysis. Superior distribution of WS2 was observed before and during friction experiments. Chemical analysis showed a significantly greater amount of PTFE‐coated INTs on rubbed surfaces, in accordance with the improved friction and wear properties.

Original language	English
Article number	78
Journal	Lubricants
Volume	9
Issue number	8
DOIs	https://doi.org/10.3390/lubricants9080078
State	Published - Aug 2021

Keywords

Agglomeration
Friction
PTFE
Surface functionalization
WS2 inorganic nanotubes

All Science Journal Classification (ASJC) codes

Mechanical Engineering
Surfaces, Coatings and Films

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10.3390/lubricants9080078

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title = "Tungsten disulfide inorganic nanotubes functionalized by ptfe for friction application",

abstract = "Inorganic nanotubes (INTs) and fullerene‐like nanoparticles (NPs) of WS2/MoS2 penetrate and exfoliate at the contact interface and facilitate tribofilm formation. While the tribological properties are greatly improved by exfoliated NPs that shed easily, they may be diminished by agglomeration in oil. Therefore, surface functionalization is employed to improve dispersion in oil‐based suspensions. Here, WS2 INTs were functionalized by polytetrafluoroethylene (PTFE) in a simple and cost‐effective bath sonication method. WS2‐INTs with two concentrations of added PTFE were characterized by scanning and transmission electron microscopy, micro‐Raman spectroscopy, and thermogravimetric analysis. Superior distribution of WS2 was observed before and during friction experiments. Chemical analysis showed a significantly greater amount of PTFE‐coated INTs on rubbed surfaces, in accordance with the improved friction and wear properties.",

keywords = "Agglomeration, Friction, PTFE, Surface functionalization, WS2 inorganic nanotubes",

author = "Tzuriel Levin and Yifat Harel and Lellouche, {Jean Paul} and Alexey Moshkovich and Igor Lapsker and Alex Laikhtman and Lev Rapoport",

note = "Publisher Copyright: {\textcopyright} 2021 by the authors. Licensee MDPI, Basel, Switzerland.",

year = "2021",

month = aug,

doi = "10.3390/lubricants9080078",

language = "الإنجليزيّة",

volume = "9",

journal = "Lubricants",

issn = "2075-4442",

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TY - JOUR

T1 - Tungsten disulfide inorganic nanotubes functionalized by ptfe for friction application

AU - Levin, Tzuriel

AU - Harel, Yifat

AU - Lellouche, Jean Paul

AU - Moshkovich, Alexey

AU - Lapsker, Igor

AU - Laikhtman, Alex

AU - Rapoport, Lev

PY - 2021/8

Y1 - 2021/8

N2 - Inorganic nanotubes (INTs) and fullerene‐like nanoparticles (NPs) of WS2/MoS2 penetrate and exfoliate at the contact interface and facilitate tribofilm formation. While the tribological properties are greatly improved by exfoliated NPs that shed easily, they may be diminished by agglomeration in oil. Therefore, surface functionalization is employed to improve dispersion in oil‐based suspensions. Here, WS2 INTs were functionalized by polytetrafluoroethylene (PTFE) in a simple and cost‐effective bath sonication method. WS2‐INTs with two concentrations of added PTFE were characterized by scanning and transmission electron microscopy, micro‐Raman spectroscopy, and thermogravimetric analysis. Superior distribution of WS2 was observed before and during friction experiments. Chemical analysis showed a significantly greater amount of PTFE‐coated INTs on rubbed surfaces, in accordance with the improved friction and wear properties.

AB - Inorganic nanotubes (INTs) and fullerene‐like nanoparticles (NPs) of WS2/MoS2 penetrate and exfoliate at the contact interface and facilitate tribofilm formation. While the tribological properties are greatly improved by exfoliated NPs that shed easily, they may be diminished by agglomeration in oil. Therefore, surface functionalization is employed to improve dispersion in oil‐based suspensions. Here, WS2 INTs were functionalized by polytetrafluoroethylene (PTFE) in a simple and cost‐effective bath sonication method. WS2‐INTs with two concentrations of added PTFE were characterized by scanning and transmission electron microscopy, micro‐Raman spectroscopy, and thermogravimetric analysis. Superior distribution of WS2 was observed before and during friction experiments. Chemical analysis showed a significantly greater amount of PTFE‐coated INTs on rubbed surfaces, in accordance with the improved friction and wear properties.

KW - Agglomeration

KW - Friction

KW - PTFE

KW - Surface functionalization

KW - WS2 inorganic nanotubes

UR - http://www.scopus.com/inward/record.url?scp=85112514194&partnerID=8YFLogxK

U2 - 10.3390/lubricants9080078

DO - 10.3390/lubricants9080078

M3 - مقالة

SN - 2075-4442

VL - 9

JO - Lubricants

JF - Lubricants

IS - 8

M1 - 78

ER -

Tungsten disulfide inorganic nanotubes functionalized by ptfe for friction application

Abstract

Keywords

All Science Journal Classification (ASJC) codes

Access to Document

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