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Download fileDetermination of Interfacial Tension of Nanomaterials and the Effect of Particle Size on Interfacial Tension
journal contribution
posted on 2021-12-04, 13:43 authored by Mengying Wang, Zixiang Cui, Yongqiang XueThe
unique physical and chemical properties and performances of
nanomaterials are closely related to the interfacial tension. However,
there is no method to accurately measure the interfacial tension of
nanomaterials. In addition, the effect of particle size on the interfacial
tension of nanoparticles is unclear, and there exist conflicting conclusions
about the value and sign of Tolman length. In this paper, a novel
method of determining the interfacial tension (solid–liquid
and solid–gas interfaces), temperature coefficient of interfacial
tension, and Tolman lengths of nanomaterials by adsorption thermodynamics
and kinetics was presented. The interfacial tension and its temperature
coefficient of the solid–liquid interface of nano cadmium sulfide
before adsorption were obtained, and further, the Tolman length was
also obtained. The experimental results show that the particle size
of nanoparticles has significant effects on the interfacial tension
and its temperature coefficient. When the radius is larger than 10
nm, the interfacial tension and its temperature coefficient are almost
constant with the decrease of the radius. When the radius is less
than 10 nm, the interfacial tension decreases sharply and the temperature
coefficient increases sharply with the decrease of the radius, and
the temperature coefficient of the interfacial tension is negative.
The Tolman length of the solid–liquid interface of nanoparticles
is proved to be positive, and the particle size also has a significant
effect on the Tolman length. The Tolman length decreases with the
decrease of particle size. However, the effects of particle size on
the Tolman length become significant only when the particle radius
approach or reach the order of magnitudes of molecular (or atomic)
radius. The effects of particle size on interfacial tension and Tolman
length of nano cadmium sulfide obtained in this paper can provide
significant references for the research and applications of interface
thermodynamics of other nanomaterials.
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solid – liquidnano cadmium sulfideexperimental results showexist conflicting conclusionsprovide significant referencestolman length decreasesparticle size alsoparticle radius approachparticle sizetolman lengthtolman lengthsunique physicaltemperature coefficientinterfacial tensioninterface thermodynamicsclosely relatedchemical propertiesalso obtainedalmost constantaccurately measure10 nm