CFN Colloquium

"Uncovering Pathways for Scalable Polymer Self-Assembly"

Presented by Gregory Doerk, Brookhaven National Laboratory, Center for Functional Nanomaterials

Thursday, January 6, 2022, 4:00 pm — Videoconference / Virtual Event (see link below)

The self-assembly of block copolymer thin films can produce highly uniform and periodic nanopatterns across large areas, potentially changing the technological landscape for nanolithography, photon management, and porous membrane synthesis. However, slow pattern ordering and non-scalable assembly processes impede translation of promising laboratory demonstrations using block copolymers to real world technologies. In this talk, I will describe recent discoveries elucidating how blending block copolymers with low molecular weight homopolymers can reduce required assembly times by an order of magnitude or more. These homopolymers lower energy barriers to block copolymer diffusion, accelerate nanopattern reorientation, and respond synergistically with solvent vapors to help form pathway-dependent, metastable morphologies. I will also present a new CFN-developed capability for casting thin film combinatorial blend libraries of polymers and other nanomaterials by electrospray deposition. Combined with characterization methods like synchrotron X-ray scattering, this capability enables the creation of morphology-property-composition diagrams covering an entire ternary blend composition space within a single day. I will conclude the talk by presenting plans for future research inspired by this electrospray deposition capability. By integrating programmable spraying with in situ X-ray scattering and machine learning, this research will introduce an adaptive workflow for directing polymer self-assembly along specific pathways using active spray control. This workflow will ultimately be applied to the scalable synthesis-by-assembly of nanoporous membranes possessing unique functionalities.

Hosted by: Kevin Yager

Videoconference Instructions

Please click the link below to join the webinar: Passcode: 349211 Or iPhone one-tap : US: +16692545252,,1610998573#,,,,,,0#,,349211# or +16468287666,,1610998573#,,,,,,0#,,349211# Or Telephone: Dial(for higher quality, dial a number based on your current location): US: +1 669 254 5252 or +1 646 828 7666 Webinar ID: 161 099 8573 Passcode: 349211 International numbers available: Or an H.323/SIP room system: H.323: (US West) or (US East) Meeting ID: 161 099 8573 Passcode: 349211 SIP: Passcode: 349211

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