The effect of nanoparticles on the liquid-gas surface tension of Bi2Te3 nanofluids.
This work investigates the effect of size and concentration of nanoparticles on the effective gas-liquid surface tension of aqueous solutions of bismuth telluride nanoparticles functionalized with thioglycolic acid. The gas-liquid surface tension is obtained by solving the Laplace-Young equation under experimentally measured boundary conditions and droplet parameters. The results demonstrate that the gas-liquid surface tension depends on concentration as well as nanoparticle size. Solutions containing 2.5 and 10.4 nm nanoparticle diameters have been tested. For both, a minimum surface tension exists within the range of tested mass concentrations. The largest reduction in the surface tension (>50% versus bulk liquid) occurred for the 2.5 nm nanoparticle nanofluid. Accumulation and assembly of the charged nanoparticles at the liquid-gas interface was assumed to be responsible for the surface tension of the nanofluids investigated in this work.
Vafaei
Saeid
S
School of Engineering and Materials Science, Queen Mary College, University of London, UK.
Purkayastha
Arup
A
Jain
Abhishek
A
Ramanath
Ganapathiraman
G
Borca-Tasciuc
Theodorian
T
D001729:Bismuth / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D005740:Gases / Q000737:chemistry*; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000379:methods*; D010316:Particle Size; D012996:Solutions; D013499:Surface Properties; D013500:Surface Tension; D013691:Tellurium / Q000737:chemistry*
D005740:Gases; D046911:Macromolecular Substances; D012996:Solutions; D013691:Tellurium; D001729:Bismuth