TY - JOUR
T1 - Microscopy Study of Morphology of Electrospun Fiber-MOF Composites with Secondary Growth
AU - Armstrong, Mitchell R.
AU - Shan, Bohan
AU - Mu, Bin
N1 - Funding Information:
We would like to acknowledge the use of facilities with the LeRoy Eyring Center for Solid State Science at Arizona State University and the use of SEM provided by Prof. Yongming Liu. We also acknowledge the kind help from the SEMTE lab manager Fred Pena.
Publisher Copyright:
© 2017 Materials Research Society.
PY - 2017
Y1 - 2017
N2 - Microscopy studies were performed over a series of metal-organic-framework (MOF) imbedded electrospun fibers. Analysis of as-spun fibers revealed five different MOF particle-fiber imbedded morphologies including complete particle encasement, over-filled, surface-bound, welded, and agglomerated. To mitigate issues with fiber breakup during electrospinning (ES) due to MOF particle incorporation, secondary growth method was used. Secondary growth was performed on both Matrimid and polysulfone fibers impregnated with a MOF, ZIF-8, in either water or methanol solvents. Results show that when water was used, crystal formation was limited to formation on the top layer of the fiber mat due to hydrophobicity. When methanol was used in place of water, MOF crystal growth occurred in a patchwise manner, where crystals grow across fibers and span the entire fiber mat. From this work, it was determined that successful secondary growth of MOF imbedded electrospun fibers can be accomplished when particles are either highly exposed along the fiber surface for adequate exposure to solvent, or the solvent used promotes reactant penetration into the polymer to allow access to the seeded MOF crystals.
AB - Microscopy studies were performed over a series of metal-organic-framework (MOF) imbedded electrospun fibers. Analysis of as-spun fibers revealed five different MOF particle-fiber imbedded morphologies including complete particle encasement, over-filled, surface-bound, welded, and agglomerated. To mitigate issues with fiber breakup during electrospinning (ES) due to MOF particle incorporation, secondary growth method was used. Secondary growth was performed on both Matrimid and polysulfone fibers impregnated with a MOF, ZIF-8, in either water or methanol solvents. Results show that when water was used, crystal formation was limited to formation on the top layer of the fiber mat due to hydrophobicity. When methanol was used in place of water, MOF crystal growth occurred in a patchwise manner, where crystals grow across fibers and span the entire fiber mat. From this work, it was determined that successful secondary growth of MOF imbedded electrospun fibers can be accomplished when particles are either highly exposed along the fiber surface for adequate exposure to solvent, or the solvent used promotes reactant penetration into the polymer to allow access to the seeded MOF crystals.
KW - Scanning electron microscopy (SEM)
KW - crystal growth
KW - porosity
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U2 - 10.1557/adv.2017.413
DO - 10.1557/adv.2017.413
M3 - Article
AN - SCOPUS:85041359132
SN - 2059-8521
VL - 2
SP - 2457
EP - 2463
JO - MRS Advances
JF - MRS Advances
IS - 46
ER -