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"Black Gold: Plasmonic Colloidosomes with Broadband Absorption Self-Assembled from Monodispersed Gold Nanospheres by Using a Reverse Emulsion System" describes a similar phenomena of red gold nanoparticles assembling into black 3D structures, except they had to go through more steps than just drying them.


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These are apparently different phenomena, but with inconsistent uses. From this article, "Distinguishing between aggregates and agglomerates of flame-made $TiO_2$ by high-pressure dispersion": Dispersing these suspensions through a nozzle at 200 to 1400 bar reduced the size of agglomerates (particles bonded by weak physical forces) resulting in bimodal ...



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