2 research outputs found
Dialkyldithiophosphate Acids (HDDPs) as Effective Lubricants of SolâGel Titania Coatings in Technical Dry Friction Conditions
The goal of this study was the investigation of
the effectiveness of dialkyldithiophosphate acids (HDDPs)
films in improving the tribological properties of thin, solâ
gel derived titania coatings. Amorphous, anatase, and rutile
titania coatings were obtained using solâgel dipâcoating
deposition after treatment at 100, 500, and 1,000 C,
respectively. Titania coatings were then modified from the
liquid phase by HDDPs acids having dodecyl-(C12), tetradecyl-(C14),
and hexadecyl-(C16) alkyl chains deposited by
dipâcoating (DC) and LangmuirâBlodgett (LB) methods.
The influence of the deposition procedure, the length of the
HDDPs alkyl chain and the type of titania substrate on the
surface morphology and tribological properties were studied.
It was found, using wetting contact angle measurements,
that these modifications of titania coatings decrease
the surface free energy and increase its hydrophobicity.
The surface topography imaged by Atomic force microscopy
(AFM), exhibit island-like or agglomerate features for
the DC deposition method, while smooth topographies
were observed for LB depositions. Tribological tests were
conducted by means of a microtribometer operating in the
normal load range 30â100 mN. An enhancement of tribological
properties was observed upon modification, as
compared to unmodified titania
Achieving environmental sustainability
Crucial changes are needed in the mainstream way of doing business. In order to achieve environmental sustainability, managers must overcome the âbusiness as usualâ approach characterized by a narrow, company-centric focus and internalize ecological limits (carrying capacity, critical natural capital,
and so on) in the decision-making process