LaCl3 cross-linking of silica nanoparticles within stripes
This protocol is extracted from research article:
Shaping nanoparticle fingerprints at the interface of cholesteric droplets
Sci Adv, Oct 12, 2018; DOI: 10.1126/sciadv.aat8597

Nanoparticles were aligned within stripes on the surface of cholesteric droplets in a solution of water with 0.01 wt %, 30-nm nanoparticles, 5 mM C8TAB, and 0.2 mM HCl (Fig. 2). Excess nanoparticles were removed by gently replacing the supernatant with a solution of water with only 5 mM C8TAB and 0.2 mM HCl. This is repeated three times. The nanoparticles at the interface were then cross-linked within stripes by replacing the supernatant with an aqueous solution with 5 mM C8TAB, 0.2 mM HCl, and 0.5 mM LaCl3. After leaving the sample to sit for ~5 min, the rinsing procedure was performed again with a similar aqueous solution that excludes the LaCl3.

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