Dendritic Growth of Glycine from Nonphotochemical Laser-Induced Nucleation of Supersaturated Aqueous Solutions in Agarose Gels

Tasfia Tasnim, Audrey Goh, Omar Gowayed, Chunhua T. Hu, Tzu Yi Chen, Janice E. Aber, Bruce Garetz

Research output: Contribution to journalArticle

Abstract

We have observed two new morphologies of crystalline glycine grown from supersaturated aqueous solutions in agarose gels: tree-branch dendrites that nucleate spontaneously from a solution interface or by nonphotochemical laser-induced nucleation (NPLIN) at the air-solution interface, and stellar dendrites that nucleate in the bulk of the solution induced only by laser irradiation. The tree-branch dendrites always consist of parallel, needle-like microcrystals of α-glycine and always grow unidirectionally in the c-direction, forming branches with small branching angles. The four-armed stellar dendrites consist of conglomerates of plate-like microcrystals of either α- or γ-glycine or a mixture of microcrystals of the two polymorphs, with the γ-glycine microcrystals concentrated in the core of the dendrite. The plate-like microcrystals of α-glycine grow primarily in the c- and a-directions. The stellar dendrite arm orientation is uncorrelated with the plane of polarization of the incident light, which does not lend support to the induced-polarization mechanism for NPLIN.

Original languageEnglish (US)
JournalCrystal Growth and Design
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Microcrystals
dendrites
glycine
Sepharose
Glycine
microcrystals
Amino acids
Nucleation
Gels
nucleation
gels
aqueous solutions
Lasers
lasers
Polarization
Laser beam effects
Polymorphism
Needles
polarization
needles

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Dendritic Growth of Glycine from Nonphotochemical Laser-Induced Nucleation of Supersaturated Aqueous Solutions in Agarose Gels. / Tasnim, Tasfia; Goh, Audrey; Gowayed, Omar; Hu, Chunhua T.; Chen, Tzu Yi; Aber, Janice E.; Garetz, Bruce.

In: Crystal Growth and Design, 01.01.2018.

Research output: Contribution to journalArticle

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AU - Gowayed, Omar

AU - Hu, Chunhua T.

AU - Chen, Tzu Yi

AU - Aber, Janice E.

AU - Garetz, Bruce

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N2 - We have observed two new morphologies of crystalline glycine grown from supersaturated aqueous solutions in agarose gels: tree-branch dendrites that nucleate spontaneously from a solution interface or by nonphotochemical laser-induced nucleation (NPLIN) at the air-solution interface, and stellar dendrites that nucleate in the bulk of the solution induced only by laser irradiation. The tree-branch dendrites always consist of parallel, needle-like microcrystals of α-glycine and always grow unidirectionally in the c-direction, forming branches with small branching angles. The four-armed stellar dendrites consist of conglomerates of plate-like microcrystals of either α- or γ-glycine or a mixture of microcrystals of the two polymorphs, with the γ-glycine microcrystals concentrated in the core of the dendrite. The plate-like microcrystals of α-glycine grow primarily in the c- and a-directions. The stellar dendrite arm orientation is uncorrelated with the plane of polarization of the incident light, which does not lend support to the induced-polarization mechanism for NPLIN.

AB - We have observed two new morphologies of crystalline glycine grown from supersaturated aqueous solutions in agarose gels: tree-branch dendrites that nucleate spontaneously from a solution interface or by nonphotochemical laser-induced nucleation (NPLIN) at the air-solution interface, and stellar dendrites that nucleate in the bulk of the solution induced only by laser irradiation. The tree-branch dendrites always consist of parallel, needle-like microcrystals of α-glycine and always grow unidirectionally in the c-direction, forming branches with small branching angles. The four-armed stellar dendrites consist of conglomerates of plate-like microcrystals of either α- or γ-glycine or a mixture of microcrystals of the two polymorphs, with the γ-glycine microcrystals concentrated in the core of the dendrite. The plate-like microcrystals of α-glycine grow primarily in the c- and a-directions. The stellar dendrite arm orientation is uncorrelated with the plane of polarization of the incident light, which does not lend support to the induced-polarization mechanism for NPLIN.

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