Laser-induced melting in two-dimensional colloidal systems

Enomoto, Yoshihisa; Sawa, Masataka; ITAMOTO, H

doi:10.1016/s0378-4371(04)01058-1

Cited by 2 publications

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“…The colloidal collapse here is analogous to the case at high shear rate reported by Ackerson and Clark, but in our case, the collapse is irreversible. It is also important to note the difference between the collapse here and laser-induced melting. , It has been reported that in the presence of a 1D periodic potential generated by two interfering laser beams, 2D strongly interacting colloidal particles can crystallize if the laser intensity is strong enough, which is known as laser-induced freezing, − and a further increase in laser intensity can melt the crystals into modulated liquids, which is referred to as laser-induced melting. , In our work, the 2D colloidal lattices are formed as a result of internal electrostatic repulsion, and a disturbance of the external laser force destroys the fine balance between interparticle interactions.…”

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confidence: 78%

Dynamics and Collapse of Two-Dimensional Colloidal Lattices

Tarimala

Dai

2006

Langmuir

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One interesting aspect of colloidal particles is the formation of colloidal crystals at the 2D and 3D levels. Here we report the dynamics and collapse of colloidal lattices at liquid-liquid interfaces using Pickering emulsions as an experimental template. The colloidal particles oscillate around their equilibrium positions. The short-time diffusion constant (<10 s) of single particles increases with increasing lattice spacing; the oil-phase viscosity has an effect on diffusion only at large interparticle distances. Strikingly, we observe that the equilibrium structure can be disturbed when increasing the output laser intensity in a confocal laser scanning microscope, which leads to the collapse of colloidal lattices in the presence of small laser powers.

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confidence: 78%

Dynamics and Collapse of Two-Dimensional Colloidal Lattices

Tarimala

Dai

2006

Langmuir

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“…Even richer phase behavior is expected if quasi two-dimensional colloidal systems are exposed to external potentials as can be realized by interfering laser beams [12,13,14], periodic pinning arrays [15], imprint or stamping techniques [16]. For example, in the case of one-dimensional troughs exotic phases such as the locked smectic phase or a floating solid have been predicted [17,18] and partially observed in simulations [19,20] and experiments [21].…”

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confidence: 99%

Spin models for orientational ordering of colloidal molecular crystals

2007

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Two-dimensional colloidal suspensions exposed to periodic external fields exhibit a variety of molecular crystalline phases. There two or more colloids assemble at lattice sites of potential minima to build new structural entities, referred to as molecules. Using the strength of the potential and the filling fraction as control parameters, a phase transition to unconventional orientationally ordered states can be induced. We introduce an approach that focuses at the discrete set of orientational states relevant for the phase ordering. The orientationally ordered states are mapped to classical spin systems. We construct effective Hamiltonians for dimeric and trimeric molecules on triangular lattices suitable for a statistical mechanics discussion. A mean-field analysis produces a rich phase behavior which is substantiated by Monte Carlo simulations.

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Laser-induced melting in two-dimensional colloidal systems

Cited by 2 publications

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Dynamics and Collapse of Two-Dimensional Colloidal Lattices

Dynamics and Collapse of Two-Dimensional Colloidal Lattices

Spin models for orientational ordering of colloidal molecular crystals

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