Concentric rings of polystyrene and titanium dioxide nanoparticles patterned by alternating current signal guided coffee ring effect | Zendy

Jinhua Mu | Zendy; Peng Lin | Zendy; Qiangfei Xia | Zendy

Open Access

Concentric rings of polystyrene and titanium dioxide nanoparticles patterned by alternating current signal guided coffee ring effect

Author(s) -

Jinhua Mu,

Peng Lin,

Qiangfei Xia

Publication year - 2014

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4886138

Subject(s) - polystyrene , nanoparticle , materials science , titanium dioxide , toluene , alternating current , capillary action , signal (programming language) , nanotechnology , substrate (aquarium) , dielectrophoresis , chemical engineering , analytical chemistry (journal) , composite material , chemistry , polymer , chromatography , microfluidics , organic chemistry , voltage , physics , oceanography , quantum mechanics , geology , computer science , engineering , programming language

The authors studied the surface deposition of nanoparticles by introducing an alternating current (AC) signal into the millimeter-sized nanoparticle droplet. For both polystyrene (PS) in deionized (DI) water and titanium dioxide (TiO2) in toluene, the nanoparticles self-assembled into regular concentric rings over a larger area on the substrate during the droplet drying process. The patterned area decreased, and the inter-ring spacing increased with higher AC frequencies for the TiO2/toluene system, while those for the PS/DI water system only changed slightly. The frequency dependent pattern formation was interpreted by the interaction between different factors such as capillary flow and the AC signal introduced dielectrophoresis force.

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