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Hydrophobic Salt-modified Nafion for Enzyme Immobilization and Stabilization

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Nafion: A Flexible Template for Selective Structuring.

Nikolai F Bunkin¹, Polina N Bolotskova¹, Sergey V Gudkov²

¹Department of Fundamental Sciences, Bauman Moscow State Technical University, 2nd Bauman Str. 5, Moscow 105005, Russia.

|March 28, 2024

Summary

This summary is machine-generated.

Polymer fibers in Nafion substrates unwind in natural water, influencing crystal structure. This unwinding effect, absent in deuterium-depleted water, dictates crystal syngony, leading to monoclinic or triclinic systems.

Keywords:

Nafion X-ray diffraction crystal growth deuterium-depleted water polymer membrane stabilizing polymeric template –SO3H groups

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Area of Science:

Materials Science
Polymer Science
Crystallography

Background:

Crystal growth is influenced by substrate properties.
Nafion (a polymer) substrates exhibit unique fiber unwinding behavior in aqueous solutions.
Deuterium content in water affects Nafion fiber unwinding.

Purpose of the Study:

To investigate the effect of Nafion polymer fiber unwinding on crystal growth.
To understand how water's deuterium content influences crystal formation on polymer substrates.
To develop a theoretical model for polymer-crystal interactions.

Main Methods:

Preparation of supersaturated aqueous solutions using natural and deuterium-depleted water.
Crystal growth experiments on Nafion polymeric substrates.
X-ray diffractometry for crystal structure analysis.
Development of a quantitative theoretical model.

Main Results:

Nafion polymer fibers unwind in natural water (157 ± 1 ppm deuterium) but not in deuterium-depleted water (≤ 3 ppm).
Unwound fibers, spaced at nanometer distances, direct crystal growth normally to the substrate.
X-ray diffraction confirmed that unwound fibers predetermine crystal syngony, resulting in monoclinic or triclinic systems.
A theoretical model describes polymer-crystal interactions, viewing the substrate as a flexible matrix.

Conclusions:

The unwinding of Nafion polymer fibers in natural water significantly influences the crystallographic system of grown crystals.
The deuterium content of water is a critical factor controlling this substrate-mediated crystal growth.
The polymer substrate acts as a flexible matrix, guiding crystal formation through specific molecular interactions.