@article{b8d31a895fcb44e4ab79b1e89ad2f286,
title = "Cationic Polymer Brush/Giant Polysaccharide Sacran Assembly: Structure and Lubricity",
abstract = "A highly effective aqueous lubrication strategy employing electrostatic assembly of a negatively charged ultrahigh molecular weight natural polysaccharide named {"}sacran{"}and a positively charged poly[2-(methacryloyloxy)ethyltrimethylammonium chloride] (PMTAC) brush was investigated. The PMTAC brush was compressed through the adsorption of sacran to produce the layered structure of a PMTAC brush/sacran hybrid bottom layer and a poorly hydrated sacran top layer. The dynamic friction coefficients of the PMTAC brush were drastically reduced in salt-free sacran aqueous solutions, and the lubrication mode transition from the brush-lubrication regime to hydrodynamic lubrication was promoted. The electrostatic assembly was inhibited by the addition of NaCl into the lubricant solutions, leading to the loss of the lubrication effect. The hydrodynamic lubrication would be encouraged by the local viscosity enhancement at the friction boundary due to the poorly hydrated and highly viscous PMTAC brush/sacran hybrid film produced by the spontaneous electrostatic assembly.",
author = "Kosuke Igata and Tatsunori Sakamaki and Yoshihiro Inutsuka and Yuji Higaki and Okajima, {Maiko K.} and Yamada, {Norifumi L.} and Tatsuo Kaneko and Atsushi Takahara",
note = "Funding Information: This work was supported by JSPS KAKENHI Grant Number JP18K05218. The financial support for this work was provided by JSPS Grant-in-aid for Scientific Research (A) (Research Project Number: 26248053, 17H01221). Y.H. acknowledges financial support from the Iketani Science and Technology Foundation. This work was partially supported by the ImPACT Program of the Council for Science, Technology and Innovation (Cabinet Office, Government of Japan). This work was performed under the Cooperative Research Program of {"}Network Joint Research Center for Materials and Devices{"} and was supported in part by the {"}Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials{"} (MEXT) and {"}Integrated Research Consortium on Chemical Sciences{"} (MEXT). NR measurements were performed on the BL-16 in the Materials and Life Science Facility (MLF), J-PARC, Japan (program nos. 2014S08, 2017L2501, 2018A0279). Funding Information: This work was supported by JSPS KAKENHI Grant Number JP18K05218. The financial support for this work was provided by JSPS Grant-in-aid for Scientific Research (A) (Research Project Number: 26248053, 17H01221). Y.H. acknowledges financial support from the Iketani Science and Technology Foundation. This work was partially supported by the ImPACT Program of the Council for Science, Technology and Innovation (Cabinet Office, Government of Japan). This work was performed under the Cooperative Research Program of “Network Joint Research Center for Materials and Devices” and was supported in part by the “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” (MEXT) and “Integrated Research Consortium on Chemical Sciences” (MEXT). NR measurements were performed on the BL-16 in the Materials and Life Science Facility (MLF), J-PARC, Japan (program nos. 2014S08, 2017L2501, 2018A0279). Publisher Copyright: {\textcopyright} 2020 American Chemical Society.",
year = "2020",
month = jun,
day = "16",
doi = "10.1021/acs.langmuir.0c00854",
language = "English",
volume = "36",
pages = "6494--6501",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "23",
}