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Chemical Structure| 2420-56-6

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Johnson, Christopher ; Dong, Ruiqi ; Osuji, Chinedum ;

Abstract: The transport of ionic species in nanoporous polymers is central to the development of membranes for electrochemical devices. Here, we devise a strategy for fabricating highly ordered nanoporous polymers using sustainable materials and study the transport of potassium ions in the uniform, sub-1 nm pores of the system. Self-assembly of conjugated linoleic acid in a glycerol-water mixture yields a direct hexagonal lyotropic mesophase. Photoinduced mesophase crosslinking produces a nanoporous polymer membrane in which the continuous yet structured aqueous domain provides pores within which ion transport can occur. The membrane features a transport limiting dimension, or effective pore size of 0.65 nm, with 0.70 nm separation of negatively charged carboxylate headgroups on the pore walls. Despite the small pores size relative to hydrated K+ , we observe K+ conductivities of approximately 1 mS/cm and 10 mS/cm at 50% and 80% relative humidity (RH) at 30°C. The activation energy for K+ transport decreases with hydration from about 45 kJ/mol to 25 kJ/mol as the hydration number increases from ≈2 to 17 on changing relative humidity from 30% to 80%, while the membranes show less than 10% swelling. The activation energy at 80% RH is ≈1.5× that for K+ conduction in bulk electrolyte, suggesting that confinement and ion pairing interactions do not significantly hinder transport. The well-defined pore size may offer opportunities for sustainably-derived membranes for electrochemical devices where size-based restriction of species crossover is required alongside appreciable conductivities.

Keywords: polymer electrolyte ; ion transport ; nanoporous polymer ; self-assembly ; sustainable materials

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Dong, Ruiqi ; Kim, Na Kyung ; Osuji, Chinedum O. ;

Abstract: The development of functional using sustainable resources is an increasingly important pursuit. Unsaturated fatty acids represent a potentially interesting class of renewable materials for this purpose. Their unsaturated carbon bonds permit crosslinking to form solid . Addnl., their functional groups provide for the display of sp. surface chem. within the resulting , and also enable chem. derivatization. Here, we explore the fabrication of nanometer-scale size-selective membranes using derived . salt conjugated linoleic acid (KCLA) self-assembled to form hexagonally packed cylinders (HI) in an aqueous medium containing . This structure provides a highly ordered medium with aqueous-continuous channels for nanofiltration. The HI mesophase was crosslinked with the addition of bifunctional comonomers and the ordered structure was retained with good fidelity in the resulting thin polymer films (< 400 nm thick). These film function effectively as nanofiltration membranes, with a size cut-off of approx. 1.2 nm for charged solutes, while maintaining a high permeance of ∼ 9 LMH/bar. This performance is on par with several com. nanofiltration membranes and these materials are therefore of potential interest for advancing sustainability concerns in practical nanofiltration applications.

Keywords: self-assembly ; nanofiltration ; liquid crystal membrane ; thin film ; sustainable materials

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Product Details of (10E,12Z)-Octadeca-10,12-dienoic acid

CAS No. :2420-56-6
Formula : C18H32O2
M.W : 280.45
SMILES Code : CCCCC/C=C\C=C\CCCCCCCCC(O)=O
MDL No. :MFCD02259040
InChI Key :GKJZMAHZJGSBKD-NMMTYZSQSA-N
Pubchem ID :5282800

Safety of (10E,12Z)-Octadeca-10,12-dienoic acid

GHS Pictogram:
Signal Word:Warning
Hazard Statements:H302-H315-H319-H335
Precautionary Statements:P261-P280-P301+P312-P302+P352-P305+P351+P338
 

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