Open AccessInterfacial rheological study of silica nanoparticle monolayer by an indentation approach
Author(s) -
Zang Du-Yang,
Yongjian Zhang
Publication year - 2012
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.61.026803
Subject(s) - materials science , rheology , viscoelasticity , monolayer , nanoparticle , composite material , surface pressure , indentation , relaxation (psychology) , particle (ecology) , layer (electronics) , oscillation (cell signaling) , adsorption , surface tension , nanotechnology , mechanics , thermodynamics , chemistry , biology , genetics , psychology , social psychology , oceanography , physics , geology
We propose a novel approach for the study of rheological properties of silica nanoparticle monolayers at the air-water interface. The layers are deformed by indenting and raising a titanium cone. The surface pressure variations in these down-up cycles are recorded and analysed. The oscillation amplitude of surface pressure d results from the tensile deformation of the particle layer. d and the relaxation time are strongly dependent on the adsorption energy of particles at the interface, thereby significantly changing the particle hydrophobicity. The results provide a deeper insight into the viscoelastic behaviour of particle layer, suggesting that the proposed method can be utilized for the rheological study of the layers of this kind.