The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant
The UV irradiation of Z-Tetraol films on amorphous nitrogenated carbon surfaces was investigated. COF2 evolution, captured in the gas phase, decreased with increasing number of OH end groups in the order: Z > Zdol > Z-Tetraol after UV irradiation. Both UV irradiation and annealing on 1...
Guardado en:
| Autores principales: | , , , , , |
|---|---|
| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Japanese Society of Tribologists
2012
|
| Materias: | |
| Acceso en línea: | https://doaj.org/article/e6a60ff82811452d8cb02f99c0d5b60b |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| id |
oai:doaj.org-article:e6a60ff82811452d8cb02f99c0d5b60b |
|---|---|
| record_format |
dspace |
| spelling |
oai:doaj.org-article:e6a60ff82811452d8cb02f99c0d5b60b2021-11-05T09:25:03ZThe Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant1881-219810.2474/trol.7.70https://doaj.org/article/e6a60ff82811452d8cb02f99c0d5b60b2012-05-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/trol/7/2/7_70/_pdf/-char/enhttps://doaj.org/toc/1881-2198The UV irradiation of Z-Tetraol films on amorphous nitrogenated carbon surfaces was investigated. COF2 evolution, captured in the gas phase, decreased with increasing number of OH end groups in the order: Z > Zdol > Z-Tetraol after UV irradiation. Both UV irradiation and annealing on 11 Å Z-Tetraol films produced virtually identical interfacial properties - surface energy as a function of bonded fraction. The UV-irradiated 11 Å Z-Tetraol films also demonstrated equilibrium behavior exhibiting bonding or debonding to the asymptotic 80% bonded level under ambient conditions. UV-irradiated thick films of Z-Tetraol (∼ 20-40 Å) exhibited film properties that differed from the non-irradiated films. The oscillations in the polar component of the surface energy, normally observed in Z-Tetraol films and attributed to amphiphilic structuring, disappeared. Terraced flow exhibited a rapidly moving front below ∼ 10 Å compared to the remainder of the irradiated film. Both observations were tentatively attributed to loss of OH functionality. The latter was verified by chemical extraction and subsequent analyses by NMR and TGA.Robert J. WaltmanJohn NewmanXing-Cai GuoJohn BurnsConnie WitiaMina AmoJapanese Society of Tribologistsarticleperfluoropolyether disk lubricantuv irradiationsurface energybonding kineticsPhysicsQC1-999Engineering (General). Civil engineering (General)TA1-2040Mechanical engineering and machineryTJ1-1570ChemistryQD1-999ENTribology Online, Vol 7, Iss 2, Pp 70-80 (2012) |
| institution |
DOAJ |
| collection |
DOAJ |
| language |
EN |
| topic |
perfluoropolyether disk lubricant uv irradiation surface energy bonding kinetics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 |
| spellingShingle |
perfluoropolyether disk lubricant uv irradiation surface energy bonding kinetics Physics QC1-999 Engineering (General). Civil engineering (General) TA1-2040 Mechanical engineering and machinery TJ1-1570 Chemistry QD1-999 Robert J. Waltman John Newman Xing-Cai Guo John Burns Connie Witia Mina Amo The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant |
| description |
The UV irradiation of Z-Tetraol films on amorphous nitrogenated carbon surfaces was investigated. COF2 evolution, captured in the gas phase, decreased with increasing number of OH end groups in the order: Z > Zdol > Z-Tetraol after UV irradiation. Both UV irradiation and annealing on 11 Å Z-Tetraol films produced virtually identical interfacial properties - surface energy as a function of bonded fraction. The UV-irradiated 11 Å Z-Tetraol films also demonstrated equilibrium behavior exhibiting bonding or debonding to the asymptotic 80% bonded level under ambient conditions. UV-irradiated thick films of Z-Tetraol (∼ 20-40 Å) exhibited film properties that differed from the non-irradiated films. The oscillations in the polar component of the surface energy, normally observed in Z-Tetraol films and attributed to amphiphilic structuring, disappeared. Terraced flow exhibited a rapidly moving front below ∼ 10 Å compared to the remainder of the irradiated film. Both observations were tentatively attributed to loss of OH functionality. The latter was verified by chemical extraction and subsequent analyses by NMR and TGA. |
| format |
article |
| author |
Robert J. Waltman John Newman Xing-Cai Guo John Burns Connie Witia Mina Amo |
| author_facet |
Robert J. Waltman John Newman Xing-Cai Guo John Burns Connie Witia Mina Amo |
| author_sort |
Robert J. Waltman |
| title |
The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant |
| title_short |
The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant |
| title_full |
The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant |
| title_fullStr |
The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant |
| title_full_unstemmed |
The Effect of UV Irradiation on the Z-Tetraol Boundary Lubricant |
| title_sort |
effect of uv irradiation on the z-tetraol boundary lubricant |
| publisher |
Japanese Society of Tribologists |
| publishDate |
2012 |
| url |
https://doaj.org/article/e6a60ff82811452d8cb02f99c0d5b60b |
| work_keys_str_mv |
AT robertjwaltman theeffectofuvirradiationontheztetraolboundarylubricant AT johnnewman theeffectofuvirradiationontheztetraolboundarylubricant AT xingcaiguo theeffectofuvirradiationontheztetraolboundarylubricant AT johnburns theeffectofuvirradiationontheztetraolboundarylubricant AT conniewitia theeffectofuvirradiationontheztetraolboundarylubricant AT minaamo theeffectofuvirradiationontheztetraolboundarylubricant AT robertjwaltman effectofuvirradiationontheztetraolboundarylubricant AT johnnewman effectofuvirradiationontheztetraolboundarylubricant AT xingcaiguo effectofuvirradiationontheztetraolboundarylubricant AT johnburns effectofuvirradiationontheztetraolboundarylubricant AT conniewitia effectofuvirradiationontheztetraolboundarylubricant AT minaamo effectofuvirradiationontheztetraolboundarylubricant |
| _version_ |
1718444382708826112 |