2015
DOI: 10.1039/c5sm00009b
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Phase transformations in binary colloidal monolayers

Abstract: Phase transformations can be difficult to characterize at the microscopic level due to the inability to directly observe individual atomic motions. Model colloidal systems, by contrast, permit the direct observation of individual particle dynamics and of collective rearrangements, which allows for real-space characterization of phase transitions. Here, we study a quasi-two-dimensional, binary colloidal alloy that exhibits liquid-solid and solid-solid phase transitions, focusing on the kinetics of a diffusionle… Show more

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Cited by 22 publications
(29 citation statements)
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“…Additionally, we achieved a more precise characterization of the magnetic susceptibility of the magnetic beadχm = 1.07, which is 30 % smaller than in our prior analyses. 12 While the mean domain size we were able to experimentally obtain is on the order of ∼ 600 particles, future improvements of the experimental conditions through the use of better passivated surfaces, the reduction of particle aggregation and imbalance in particle concentration should enable us to approach crystal sizes of ∼ 5000 particles predicted in the idealized simulations. The ability to obtain sufficiently large colloidal crystal alloys will facilitate future scientific investigations on grain boundary motions, 9 dynamics of vacancies and defects, 8 jamming transitions, 45 and various types of phase transitions that are difficult or impossible to observe in atomic systems.…”
Section: Discussionmentioning
confidence: 92%
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“…Additionally, we achieved a more precise characterization of the magnetic susceptibility of the magnetic beadχm = 1.07, which is 30 % smaller than in our prior analyses. 12 While the mean domain size we were able to experimentally obtain is on the order of ∼ 600 particles, future improvements of the experimental conditions through the use of better passivated surfaces, the reduction of particle aggregation and imbalance in particle concentration should enable us to approach crystal sizes of ∼ 5000 particles predicted in the idealized simulations. The ability to obtain sufficiently large colloidal crystal alloys will facilitate future scientific investigations on grain boundary motions, 9 dynamics of vacancies and defects, 8 jamming transitions, 45 and various types of phase transitions that are difficult or impossible to observe in atomic systems.…”
Section: Discussionmentioning
confidence: 92%
“…Although we are not able to accurately measure that thickness, we can estimate it by evaluating the center-center distance of a stacked pair of particles, which sometimes forms within the suspension. 12,29 Based on this measured distance and knowledge of the actual diameter of the particles, we estimated that the film thickness is in the range of 1. 30 is used to identify the coordinates of particle centers.…”
Section: Experiments Methods and Data Analysismentioning
confidence: 99%
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“…Anisotropic stress, rapid quenching, and a small system size have been found to promote martensitic transformations [19]. In colloids, martensitic transitions have been observed in small crystalline clusters [20][21][22] or lattices stretched by external fields [18,[23][24][25]. A solid-solid transition involving an activated nucleation process has recently been experimentally observed at the single-particle level for the first time in colloidal thin-film crystals confined between two glass plates [26].…”
mentioning
confidence: 99%