TY - JOUR
T1 - Effect of Humidity and Hydrophobicity on the Tribological Properties of
Self-Assembled Monolayers
AU - Liao, Yen-Chih
AU - Hargrove, William
AU - Weeks, Brandon
PY - 2013
Y1 - 2013
N2 - The tribological properties of two distinctive alkanethiol SAMs,
16-mercaptohexadecanoic acid (MHA) and 1-octadecanethiol (ODT), on gold
substrates in various humidity conditions were examined by lateral force
microscopy (LFM). The results suggest that hydrophobic ODT SAM is
insensitive to humidity. The difference of lateral force signal is
within +/- 10% regardless of humidity. The lateral force signal of
hydrophilic MHA SAMs has a significant decrease in signal in humid
environments. The influence of bulk water was also investigated by LFM.
By imaging under water, the capillary force is eliminated on ODT SAMs,
which leads to a lower lateral force. However, the lateral force image
was reversed on MHA SAMs, which suggested that hydrophobic forces
dominated in water.
AB - The tribological properties of two distinctive alkanethiol SAMs,
16-mercaptohexadecanoic acid (MHA) and 1-octadecanethiol (ODT), on gold
substrates in various humidity conditions were examined by lateral force
microscopy (LFM). The results suggest that hydrophobic ODT SAM is
insensitive to humidity. The difference of lateral force signal is
within +/- 10% regardless of humidity. The lateral force signal of
hydrophilic MHA SAMs has a significant decrease in signal in humid
environments. The influence of bulk water was also investigated by LFM.
By imaging under water, the capillary force is eliminated on ODT SAMs,
which leads to a lower lateral force. However, the lateral force image
was reversed on MHA SAMs, which suggested that hydrophobic forces
dominated in water.
M3 - Article
JO - SCIENTIFIC WORLD JOURNAL
JF - SCIENTIFIC WORLD JOURNAL
ER -