PMID- 25161836
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20140827
LR  - 20240329
IS  - 2190-4286 (Print)
IS  - 2190-4286 (Electronic)
IS  - 2190-4286 (Linking)
VI  - 5
DP  - 2014
TI  - A nanometric cushion for enhancing scratch and wear resistance of hard films.
PG  - 1005-15
LID - 10.3762/bjnano.5.114 [doi]
AB  - Scratch resistance and friction are core properties which define the tribological 
      characteristics of materials. Attempts to optimize these quantities at solid 
      surfaces are the subject of intense technological interest. The capability to 
      modulate these surface properties while preserving both the bulk properties of 
      the materials and a well-defined, constant chemical composition of the surface is 
      particularly attractive. We report herein the use of a soft, flexible underlayer 
      to control the scratch resistance of oxide surfaces. Titania films of several nm 
      thickness are coated onto substrates of silicon, kapton, polycarbonate, and 
      polydimethylsiloxane (PDMS). The scratch resistance measured by scanning force 
      microscopy is found to be substrate dependent, diminishing in the order PDMS, 
      kapton/polycarbonate, Si/SiO2. Furthermore, when PDMS is applied as an 
      intermediate layer between a harder substrate and titania, marked improvement in 
      the scratch resistance is achieved. This is shown by quantitative wear tests for 
      silicon or kapton, by coating these substrates with PDMS which is subsequently 
      capped by a titania layer, resulting in enhanced scratch/wear resistance. The 
      physical basis of this effect is explored by means of Finite Element Analysis, 
      and we suggest a model for friction reduction based on the "cushioning effect" of 
      a soft intermediate layer.
FAU - Gotlib-Vainshtein, Katya
AU  - Gotlib-Vainshtein K
AD  - Department of Chemistry and Institute of Nanotechnology & Advanced Materials, Bar 
      Ilan University, Ramat-Gan 52900, Israel.
FAU - Girshevitz, Olga
AU  - Girshevitz O
AD  - Department of Chemistry and Institute of Nanotechnology & Advanced Materials, Bar 
      Ilan University, Ramat-Gan 52900, Israel.
FAU - Sukenik, Chaim N
AU  - Sukenik CN
AD  - Department of Chemistry and Institute of Nanotechnology & Advanced Materials, Bar 
      Ilan University, Ramat-Gan 52900, Israel.
FAU - Barlam, David
AU  - Barlam D
AD  - Department of Mechanical Engineering, Ben Gurion University, Beer Sheva, Israel.
FAU - Cohen, Sidney R
AU  - Cohen SR
AD  - Department of Chemical Research Support, Weizmann Institute of Science, Rehovot 
      76100, Israel.
LA  - eng
PT  - Journal Article
DEP - 20140710
PL  - Germany
TA  - Beilstein J Nanotechnol
JT  - Beilstein journal of nanotechnology
JID - 101551563
PMC - PMC4143114
OTO - NOTNLM
OT  - finite element analysis
OT  - hard coating
OT  - scanning probe microscopy
OT  - scratch
OT  - thin films
OT  - tribology
EDAT- 2014/08/28 06:00
MHDA- 2014/08/28 06:01
PMCR- 2014/07/10
CRDT- 2014/08/28 06:00
PHST- 2014/04/02 00:00 [received]
PHST- 2014/06/18 00:00 [accepted]
PHST- 2014/08/28 06:00 [entrez]
PHST- 2014/08/28 06:00 [pubmed]
PHST- 2014/08/28 06:01 [medline]
PHST- 2014/07/10 00:00 [pmc-release]
AID - 10.3762/bjnano.5.114 [doi]
PST - epublish
SO  - Beilstein J Nanotechnol. 2014 Jul 10;5:1005-15. doi: 10.3762/bjnano.5.114. 
      eCollection 2014.