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Ordered arrays of large latex particles organised by vertical deposition

2002; Elsevier BV; Volume: 22; Issue: 2 Linguagem: Inglês

10.1016/s0928-4931(02)00200-x

1873-0191

Leonid M. Goldenberg, Jürgen Wagner, Joachim Stumpe, B.‐R. Paulke, Eckhard Görnitz,

Electrowetting and Microfluidic Technologies

The simple preparation of the ordered multilayer films of submicrometer- and micrometer-sized monodisperse latex particles in the range of 0.2–2.5 μm is reported. The films were prepared from aqueous suspensions by vertical deposition at elevated temperatures. Both hydrophobic polystyrene (PS) and hydrophilic core-shell particles allowed good arrays formation. 3D lattice was proved by transmission and reflectance VIS–NIR spectroscopy. Well-developed Bragg peaks of up to 3200 nm have been registered. An observation of Fabry–Perot resonances in the spectra confirms good array quality. The optical properties of the grating were investigated by laser diffraction and by diffraction via an optical microscope equipped with a Betrand lens.