PMID- 29046844
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20201001
IS  - 2190-4286 (Print)
IS  - 2190-4286 (Electronic)
IS  - 2190-4286 (Linking)
VI  - 8
DP  - 2017
TI  - Imidazolium-based ionic liquids used as additives in the nanolubrication of 
      silicon surfaces.
PG  - 1961-1971
LID - 10.3762/bjnano.8.197 [doi]
AB  - In recent years, with the development of micro/nanoelectromechanical systems 
      (MEMS/NEMS), the demand for efficient lubricants of silicon surfaces intensified. 
      Although the use of ionic liquids (ILs) as additives to base oils in the 
      lubrication of steel/steel or other types of metal/ metal tribological pairs has 
      been investigated, the number of studies involving Si is very low. In this work, 
      we tested imidazolium-based ILs as additives to the base oil polyethylene glycol 
      (PEG) to lubricate Si surfaces. The friction coefficients were measured in a 
      nanotribometer. The viscosity of the PEG + IL mixtures as well as their contact 
      angles on the Si surface were measured. The topography and chemical composition 
      of the substrates surfaces were determined with atomic force microscopy (AFM) and 
      X-ray photoelectron spectroscopy (XPS), respectively. Due to the hygroscopic 
      properties of PEG, the first step was to assess the effect of the presence of 
      water. Then, a series of ILs based on the cations 1-ethyl-3-methylimidazolium 
      [EMIM], 1-butyl-3-methylimidazolium [BMIM], 1-ethyl-3-vinylimidazolium [EVIM], 
      1-(2-hydroxyethyl)-3-methylimidazolium [C(2)OHMIM] and 
      1-allyl-3-methylimidazolium [AMIM] combined with the anions dicyanamide [DCA], 
      trifluoromethanesulfonate [TfO], and ethylsulfate [EtSO(4)] were added to dry 
      PEG. All additives (2 wt %) led to a decrease in friction coefficient as well as 
      an increase in viscosity (with the exception of [AMIM][TfO]) and improved the Si 
      wettability. The additives based on the anion [EtSO(4)] exhibited the most 
      promising tribological behavior, which was attributed to the strong interaction 
      with the Si surface ensuring the formation of a stable surface layer, which 
      hinders the contact between the sliding surfaces.
FAU - Amorim, Patricia M
AU  - Amorim PM
AD  - Centro de Quimica Estrutural, Instituto Superior Tecnico, Universidade de Lisboa, 
      Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
AD  - LAQV-REQUIMTE, Departamento de Quimica, Faculdade de Ciencias e Tecnologia, 
      Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal.
FAU - Ferraria, Ana M
AU  - Ferraria AM
AD  - Centro de Quimica-Fisica Molecular and Institute of Nanoscience and 
      Nanotechnology, Instituto Superior Tecnico, Universidade de Lisboa, Av. Rovisco 
      Pais, 1049-001 Lisboa, Portugal.
FAU - Colaco, Rogerio
AU  - Colaco R
AD  - IDMEC-Instituto de Engenharia Mecanica, Departamento de Engenharia Mecanica, 
      Instituto Superior Tecnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 
      Lisboa, Portugal.
FAU - Branco, Luis C
AU  - Branco LC
AD  - LAQV-REQUIMTE, Departamento de Quimica, Faculdade de Ciencias e Tecnologia, 
      Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica, Portugal.
FAU - Saramago, Benilde
AU  - Saramago B
AD  - Centro de Quimica Estrutural, Instituto Superior Tecnico, Universidade de Lisboa, 
      Av. Rovisco Pais, 1049-001 Lisboa, Portugal.
LA  - eng
PT  - Journal Article
DEP - 20170920
PL  - Germany
TA  - Beilstein J Nanotechnol
JT  - Beilstein journal of nanotechnology
JID - 101551563
PMC - PMC5629412
OTO - NOTNLM
OT  - additives
OT  - ionic liquids
OT  - lubricants
OT  - nanotribology
OT  - silicon
EDAT- 2017/10/20 06:00
MHDA- 2017/10/20 06:01
PMCR- 2017/09/20
CRDT- 2017/10/20 06:00
PHST- 2017/05/12 00:00 [received]
PHST- 2017/08/31 00:00 [accepted]
PHST- 2017/10/20 06:00 [entrez]
PHST- 2017/10/20 06:00 [pubmed]
PHST- 2017/10/20 06:01 [medline]
PHST- 2017/09/20 00:00 [pmc-release]
AID - 10.3762/bjnano.8.197 [doi]
PST - epublish
SO  - Beilstein J Nanotechnol. 2017 Sep 20;8:1961-1971. doi: 10.3762/bjnano.8.197. 
      eCollection 2017.