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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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In Situ Programmable, Active, and Interactive Crystallization by Localized Polymerization.

Kibeom Kim1, Sangmin Oh1, Bong Lim Suh1

  • 1Extreme Materials Research Center, Korea Institute of Science and Technology, 5, Hwarang-ro 14-gil, Seoul, Seongbuk-gu, 02792, Republic of Korea.

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Summary
This summary is machine-generated.

This study introduces a novel additive manufacturing strategy for active, spatiotemporal control over crystal growth. This method enables precise programming and reprogramming of crystal structures, moving beyond passive crystallization techniques.

Keywords:
active crystallizationadditive manufacturingphotopolymerization

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Crystallography

Background:

  • Current crystallization methods are largely passive and lack spatiotemporal control.
  • Additive manufacturing offers potential for active and interactive material fabrication.

Purpose of the Study:

  • To develop a strategy for active and interactive programming and reprogramming of crystal growth.
  • To demonstrate real-time, tangible feedback control over crystal formation using additive manufacturing.

Main Methods:

  • Utilizing additive manufacturing to control in-situ, localized photopolymerization of polymeric structures within supersaturated liquid resins.
  • Employing localized polymer network formation to trigger nucleation (sparse networks) or inhibit growth (dense networks).

Main Results:

  • Crystals were successfully seeded, guided, and reprogrammed in real-time within a liquid resin.
  • Demonstrated deterministic control over crystal growth morphology through programmed polymeric structures.
  • Showcased the ability to manipulate crystal nucleation and growth rates via photopolymerization.

Conclusions:

  • Additive manufacturing enables active and interactive control over crystal growth, overcoming limitations of passive methods.
  • This approach allows for deterministic programming of crystal morphologies, integrating active control with inherent stochasticity.
  • Presents a new paradigm for 'convolutional growth' of crystals with hierarchical structures.