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ThQ linQ tQnsi 。n, 。r QnQr9y pQr unit IQn9th, ass。ciatQd with a thrQQ-phasQ
c。nta야 linQ plays an imp。rtant rolQ in numQrous su~acQ ,、QlatQd s。-Ft
mattQr pr。cQSSQS including su~acQ nuclQation and c。alQScQncQ, sur‘-FacQ
nanobubblQ stability, foams, as WQll as., nan。particlQ stabili?Qd Qmulsions.
Unf。rtunatQly, thQ linQ tQnsion is a controVQr‘sial subjQct and is frQquQntly
i9n。rQd in situati 。ns WhQr‘e it should be includQd. This c。ntrovQr‘sy arisQs for
a c。upIQ 。F rQason~‘:
(i) MQan fiQld thQor‘9 and computer simulati 。ns indicate a line tensi 。n
magnitude of J t J "' 10-11 N, wher‘eas, experiments have measured line
tensi。n magnitudes over a very wide magnitude range ( J t J "'10-12 to 10-6
N).
(ii) The line tension can be either positive 。r negative and, in fact, b。th
signs have been measured experimentally and calculated the。r‘etically. There
is a c。ntinuing debate as t。whether、。r n。t negative line tensions can give
rise t。c。ntact line instabilities.
In this talk, we describe the physics 。F parti 디es at liquid su~aces and h。w
line tension influences their behavi 。r‘. We present two methods for
measuring this line tensi 。n and discuss reasons why theor‘9 and experiment
may disagree. If there is time, we wi” describe experiments where a negative
line tension induces a contact line instability for‘ 。ii droplets at the
aqueous-air su~ace.
2018.03.애(W를D)_빼M_틈81 틈1CM
Contact. Hyuk Kyu Pak (hkpak@u메st.ac.kr)