NDLI: Expansion of charged colloids after centrifugation: formation and crystallisation of long-range repulsive glasses

Content Provider	Royal Society of Chemistry (RSC)
Author	Linden, Marjolein N. van Masri, Djamel El Blaaderen, Alfons Dijkstra, Marjolein
Copyright Year	2013
Abstract	We studied long-range repulsive glasses formed in suspensions of sterically stabilised charged colloidal poly(methyl methacrylate) particles (σ = 2.23 μm) with low polydispersity (4%) in the low-polar solvent cyclohexyl bromide (εr = 7.92). Particle interactions were described by a long-range repulsive Yukawa potential. Glasses were obtained upon compression of the suspensions by centrifugation from a body-centred-cubic crystalline structure at low initial volume fraction (η ≈ 0.02) to a close-packed amorphous structure (η ≈ 0.64). Subsequent expansion of the sediment in gravity resulted in long-range repulsive glassy structures with volume fractions η = 0.16–0.64. The presence of small clusters (mostly dumbbells; clustered fraction fcl ≥ 0.12) formed by centrifugation prevented the glasses from crystallising for several weeks, while the sediment was still expanding. We used confocal microscopy to obtain three-dimensional datasets of the system and quantitatively analysed the structure of the glasses. The structure of the glasses was found to be remarkably similar to that of hard-sphere glasses, for which experimental data were obtained by centrifugal compression of silica spheres with a hard potential, despite the much longer-range interaction potential. After more than ten weeks the clustered fraction decreased due to spontaneous dissociation of the clusters, and finally bulk crystallisation of the glasses was observed into face-centred-cubic crystals with a volume fraction of around 0.22.
Starting Page	11618
Ending Page	11633
Page Count	16
File Format	HTM / HTML PDF
ISSN	1744683X
Volume Number	9
Issue Number	48
Journal	Soft Matter
DOI	10.1039/c3sm51752g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Dispersity Centrifugation Poly(methyl methacrylate) Confocal microscopy Dissociative Sedimentation Silicon dioxide Bromide Micrometre Yukawa potential Solvent Yukawa Gravity
Content Type	Text
Resource Type	Article
Subject	Chemistry Condensed Matter Physics

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