Control of Crystal Polymorph of Glycine by Photon Pressure of a Focused Continuous Wave Near-Infrared Laser Beam

Rungsimanon, Thitiporn; Yuyama, Ken‐ichi; Sugiyama, Teruki; Masuhara, Hiroshi; Tohnai, Norimitsu; Miyata, Mikiji

doi:10.1021/jz900370x

Cited by 59 publications

(77 citation statements)

References 28 publications

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“…For example, Meyerson and colleagues 61 have used nonphotochemical laser-induced nucleation on aqueous solutions of urea, and the technique was recently applied for the selective crystallization of R-and γ-glycine. 62 The debate over the nature of the nucleation of glycine demonstrates some of the questions that need to be resolved. 63 One question intimately related to the nucleation is whether the dominant form of glycine in solution is the cyclic R 2 2 (10) dimer (analogous to the R 2 2 (8) cyclic dimers in benzoic acid) or monomers -in other words, what is the basic synthon (tecton).…”

Section: The Crucial Role Of Nucleationmentioning

confidence: 99%

Polymorphism − A Perspective

Bernstein

2011

Crystal Growth & Design

347

297

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Section: The Crucial Role Of Nucleationmentioning

confidence: 99%

Polymorphism − A Perspective

Bernstein

2011

Crystal Growth & Design

347

297

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“…For example, we have recently reported the polymorph control of glycine under photon pressure, and the formation of γ-glycine, which cannot be prepared with a conventional crystallization method, is achieved. 25 The γ-glycine formation was explained on the basis of the local molecular concentration depending on laser power and may be triggered by the molecular arrangement reflecting the electromagnetic field. We consider that the molecular dynamics leading to crystallization via the droplet formed by changing laser polarization is critical, and the result will be reported in the near future.…”

mentioning

confidence: 99%

Millimeter-Scale Dense Liquid Droplet Formation and Crystallization in Glycine Solution Induced by Photon Pressure

Yuyama

Sugiyama

Masuhara

2010

J. Phys. Chem. Lett.

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A millimeter-scale dense liquid droplet of glycine is prepared by focusing a CW near-infrared laser beam at the glass/solution interface of a thin film of its supersaturated heavy water solution. The formation process is investigated by direct observation with CCD and by measuring temporal change of the surface height with a displacement meter. The droplet becomes much larger than a focal spot size, a few mm width and ∼150 μm height, and observable with the naked eye. Interestingly, the droplet remains for a few tens of seconds even after switching off the laser beam. Whereas the droplet is kept during laser irradiation, the crystallization is immediately attained by shifting the laser beam to the air/droplet surface. It is considered that the droplet is possibly the early stage of the multistep crystallization process and plays an important role in photon pressure-induced crystallization of glycine.SECTION Nanoparticles and Nanostructures P hoton pressure, which is a gradient force toward a focal spot generated by a focused CW laser beam, has been widely employed as an optical tweezers technique to trap and to manipulate micrometer-sized objects in many fields of physics, optics, and biology. 1-3 Over the past decades, the study on photon pressure in solution has progressed with the size reduction of target materials from microscale to nanoscale, 4-6 and actually, we have extended a series of experiments on the dynamics of photon pressure-induced association of nanoparticles, polymers, micelles, and J-aggregates in their solutions at room temperature. [7][8][9][10][11] As an example, polystyrene latex nanoparticles with 24 nm diameter were trapped and gathered by photon pressure, leading to their assemblies in a focal spot. 11 In single-molecule level, Osborne et al. and Chirico et al. separately reported that the diffusion of Rhodamine 6G molecules in the focal spot were suppressed under photon pressure, although no stable trapping was achieved. 12,13 These results imply that photon pressure efficiently works even on small clusters or molecules, which have the sizes much smaller than the wavelength of the trapping laser.In 2007, we applied photon pressure of a focused CW nearinfrared laser beam to a supersaturated heavy water solution of glycine, and for the first time succeeded in inducing the crystallization, which we call "laser trapping crystallization". 14 This novel phenomenon was explained by assuming that glycine molecules form aggregates under a supersaturated condition before irradiation because the optical gradient force in our experiment is too small to trap the single molecule.Indeed, the presence of small liquid-like clusters of glycine under a supersaturated condition has been experimentally demonstrated. 15 Such clusters, which are associated with each other through weak hydrogen bonds without forming nucleus, should be gathered in the focal spot and reorganized into ordered structures by photon pressure. In 2005, Myerson et al. reported the direct confirmation on the cluster structure...

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“…The combined potential exhibits a crossover from an inverse-power behaviour at the short distances, where it is dominated by the dipoledipole interaction, to an oscillating behaviour at the long-range, which is dominated by the optically induced forces. The required laser intensities are within experimental reach both in the continous-wave [34] and pulsed [35] regimes. The ability to engineer such potentials in the laboratory may open access to novel quantum phases in laser-dressed ultracold polar gases and to provide new methods to control molecular collisions in the ultracold regime.…”

Section: Discussionmentioning

confidence: 82%

Interaction between polar molecules subject to a far-off-resonant optical field: entangled dipoles up- or down-holding each other

Lemeshko¹,

Friedrich²

2012

Molecular Physics

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We show that the electric dipole–dipole interaction between a pair of polar molecules undergoes an all-out transformation when superimposed by a far-off-resonant optical field. The combined interaction potential becomes tunable by variation of wavelength, polarisation and intensity of the optical field and its dependence on the intermolecular separation exhibits a crossover from an inverse-power to an oscillating behaviour. The ability thereby offered to control molecular interactions opens up avenues toward the creation and manipulation of novel phases of ultracold polar gases among whose characteristics is a long-range entanglement of the dipoles' mutual orientation. We devised an accurate analytic model of such optical-field-dressed dipole–dipole interaction potentials, which enables a straightforward access to the optical-field parameters required for the design of intermolecular interactions in the laboratory

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Control of Crystal Polymorph of Glycine by Photon Pressure of a Focused Continuous Wave Near-Infrared Laser Beam

Cited by 59 publications

References 28 publications

Polymorphism − A Perspective

Polymorphism − A Perspective

Millimeter-Scale Dense Liquid Droplet Formation and Crystallization in Glycine Solution Induced by Photon Pressure

Interaction between polar molecules subject to a far-off-resonant optical field: entangled dipoles up- or down-holding each other

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