@article{ea415c1b9a384e8eb493f130bba5a325,
title = "Superoleophilic Titania Nanoparticle Coatings with Fast Fingerprint Decomposition and High Transparency",
abstract = "Low surface tension sebaceous liquids such as human fingerprint oils are readily deposited on high energy surfaces such as clean glass, leaving smudges that significantly lower transparency. There have been several attempts to prevent formation of these dactylograms on glass by employing oil-repellent textured surfaces. However, nanotextured superoleophobic coatings typically scatter visible light, and the intrinsic thermodynamic metastability of the composite superoleophobic state can result in failure of the oil repellency under moderate contact pressure. We develop titania-based porous nanoparticle coatings that are superoleophilic and highly transparent and which exhibit short time scales for decomposition of fingerprint oils under ultraviolet light. The mechanism by which a typical dactylogram is consumed combines wicking of the sebum into the nanoporous titania structure followed by photocatalytic degradation. We envision a wide range of applications because these TiO2 nanostructured surfaces remain photocatalytically active against fingerprint oils in natural sunlight and are also compatible with flexible glass substrates.",
keywords = "fingerprint degradation, photocatalytic effects, smudge resistant, superoleophilic surfaces, titania nanoparticles, transparent nanoporous surfaces",
author = "Choi, {Hyungryul J.} and Park, {Kyoo Chul} and Hyomin Lee and Thomas Crouzier and Rubner, {Michael F.} and Cohen, {Robert E.} and George Barbastathis and McKinley, {Gareth H.}",
note = "Funding Information: The authors thank Prof. N. X. Fang and Dr. H. Lee at Massachusetts Institute of Technology (MIT) for the use of the optical microscope, J.-G. Kim and Dr. Y. S. Lee at MIT for useful suggestions about the optical transmissivity measurements, and Prof. Cullen R. Buie, Dr. Z. Ge, and A. Rajappan at MIT for the UV absorption spectrum measurements. We also gratefully acknowledge the staff and facility support from the Nano Structures Laboratory, Microsystems Technology Laboratory, and Center for Materials Science and Engineering at MIT for characterizing the nanoporous surfaces. This work was supported in part by the MIT Institute for Soldier Nanotechnologies (ISN) under Contract DAAD-19-02D-0002 with the U.S. Army Research Office and by the Singapore National Research Foundation (NRF) through the Singapore-MIT Alliance for Research and Technology (SMART) Centre and funded in part by a gift from the Xerox Research Center. H. J. Choi thanks STX Scholarship and Kwanjeong Educational Foundation Scholarship for financial support. K.-C. Park and H. Lee also thank the Samsung Scholarship for financial support.",
year = "2017",
month = mar,
day = "8",
doi = "10.1021/acsami.6b14631",
language = "English (US)",
volume = "9",
pages = "8354--8360",
journal = "ACS Applied Materials and Interfaces",
issn = "1944-8244",
publisher = "American Chemical Society",
number = "9",
}