TY - JOUR
T1 - Ionic strength dependent forces between end-grafted Poly(sulfobetaine) films and mica
AU - Ahmed, Syeda Tajin
AU - Madinya, Jason J.
AU - Leckband, Deborah E.
N1 - Funding Information:
This work was supported by the National Science Foundation (DMR 15?07739). The authors thank Prof. Paul Braun (Dept. of Materials Science and Engineering, University of Illinois at Urbana-Champaign) for use of laboratory resources for polymer synthesis. The authors thank Kai A. Schwenzfeier for use of Matlab code to analyze interference fringes in force measurements. The authors acknowledge the Frederick Seitz Materials Research Laboratory at the University of Illinois for use of research facilities.
Funding Information:
This work was supported by the National Science Foundation (DMR 15–07739). The authors thank Prof. Paul Braun (Dept. of Materials Science and Engineering, University of Illinois at Urbana-Champaign) for use of laboratory resources for polymer synthesis. The authors thank Kai A. Schwenzfeier for use of Matlab code to analyze interference fringes in force measurements. The authors acknowledge the Frederick Seitz Materials Research Laboratory at the University of Illinois for use of research facilities.
Publisher Copyright:
© 2021
PY - 2022/1/15
Y1 - 2022/1/15
N2 - The molecular surface properties of zwitterionic polymer coatings are central to their ultra-low fouling properties and effectiveness as steric stabilizers in concentrated salt solutions. Here, Surface Force Apparatus measurements quantified the molecular forces between end-grafted poly(sulfobetaine) methacrylate thin films and mica, as a function of the chain grafting density and ionic strength. These results demonstrate that, at the ionic strengths considered, end-grafted poly(sulfobetaine) films can be described by models for polymers in good solvent. Parameters determined from data fits to the Milner-Witten-Cates or Dolan and Edwards models for dense or dilute chains, respectively, varied with ionic strength, in ways that reflect poly(sulfobetaine) swelling and the increased excluded volume strength of chain segments. These force measurements provide new insight into how polymer coverage and salt cooperate to regulate repulsive poly(sulfobetaine) steric barriers. These findings have implications for the design of grafted poly(sulfobetaine) as colloidal stabilizers or nonfouling surface coatings.
AB - The molecular surface properties of zwitterionic polymer coatings are central to their ultra-low fouling properties and effectiveness as steric stabilizers in concentrated salt solutions. Here, Surface Force Apparatus measurements quantified the molecular forces between end-grafted poly(sulfobetaine) methacrylate thin films and mica, as a function of the chain grafting density and ionic strength. These results demonstrate that, at the ionic strengths considered, end-grafted poly(sulfobetaine) films can be described by models for polymers in good solvent. Parameters determined from data fits to the Milner-Witten-Cates or Dolan and Edwards models for dense or dilute chains, respectively, varied with ionic strength, in ways that reflect poly(sulfobetaine) swelling and the increased excluded volume strength of chain segments. These force measurements provide new insight into how polymer coverage and salt cooperate to regulate repulsive poly(sulfobetaine) steric barriers. These findings have implications for the design of grafted poly(sulfobetaine) as colloidal stabilizers or nonfouling surface coatings.
KW - Antipolyelectrolyte effect
KW - Interaction forces
KW - Surface Force Apparatus
KW - Surface forces
KW - Zwitterionic polymers
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U2 - 10.1016/j.jcis.2021.08.004
DO - 10.1016/j.jcis.2021.08.004
M3 - Article
C2 - 34392027
AN - SCOPUS:85112480224
SN - 0021-9797
VL - 606
SP - 298
EP - 306
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -