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Particle Growth in Mixed Matrix Polymer Membranes: Using Ultra-Small Angle Neutron Scattering to Observe Transient Phenomena in Casting Solutions Rachel R. Ford, Joey D. Kim, Kunlun Hong, Mamadou S. Diallo, and Julia A. Kornfield* Korea-US

SLIDE 1

Particle Growth in Mixed Matrix Polymer Membranes: Using Ultra-Small Angle Neutron Scattering to Observe Transient Phenomena in Casting Solutions

Rachel R. Ford, Joey D. Kim, Kunlun Hong, Mamadou S. Diallo, and Julia A. Kornfield* Korea-US Nano Forum September 27, 2016

SLIDE 2

Mixed matrix membranes with in-situ generated polymeric particles

Sept. 27, 2016

2 PEI/PVDF mixed matrix membrane Pure PVDF membrane

Kotte, et al. Environ. Sci. Technol. 2015, 49, (16) 9431–9442. Hwang, et al. Water Res. 2015, 73, 181–192.

Poly(vinylidene fluoride) PVDF 400,000 g/mol Poly(ethyleneimine) PEI 600 g/mol

SLIDE 3

Sept. 27, 2016

3 Fundamental Study of Structure Development in Mixed Matrix Membranes

Catalytic Polymer Films for Electrochemical Reduction of CO2

Avenues of study of mixed matrix membranes with in-situ generated polymeric particles

Thin Film Composite Membranes for Nanofiltration

Glassy Carbon Electrode Dendrimer-like particle with encapsulated Cu(0) clusters

SLIDE 4

Preparation of mixed matrix membranes

Sept. 27, 2016

4 PVDF + Crosslinked Particles PVDF + PEI Cast Membrane PVDF + PEI + Acid + ECH Non-solvent Induced Phase Separation PVDF PEI PVDF Dissolved in Good Solvent Epichlorohydrin (ECH)

SLIDE 5

Preparation of mixed matrix membranes

Sept. 27, 2016

5 PVDF + Crosslinked Particles PVDF + PEI Cast Membrane PVDF + PEI + Acid + ECH Non-solvent Induced Phase Separation PVDF PEI PVDF Dissolved in Good Solvent Epichlorohydrin (ECH)

SLIDE 6

6

The problem demanded a new methodology:

Novel application of Ultra-Small Angle Neutron Scattering (USANS)

Sept. 27, 2016
Slowed reaction time

by decreasing concentration of ECH

Decreased acquisition

time by an order of magnitude

Novel way to study

structure in membrane casting solutions

SLIDE 7

Looking Forward

Isolate structural contributions of each component in

the casting solution using fully deuterated amine precursors

Explore ion-rejecting coatings for NF membranes
Precipitate and encapsulate copper nanoparticles in

dendrimer-like particles of membranes for electrochemical reduction of CO2

Sept. 27, 2016

7

SLIDE 8

Acknowledgements

Center for Nanophase Materials

Sciences

NIST Center for Neutron

Research

Resnick Sustainability Institute
Kornfield Group & Prof. Diallo
Sept. 27, 2016