Conformal Functionalization of Cotton Fibers via Isoreticular Expansion of UiO-66 Metal-Organic Frameworks

Marion Schelling,Eugenio Otal,Manuela Kim,Juan P Hinestroza

doi:10.3390/coatings10121172

Marion Schelling, Eugenio Otal + Show 2 more

Open Access

https://doi.org/10.3390/coatings10121172

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Journal: Coatings	Publication Date: Nov 30, 2020
Citations: 6	License type: CC BY 4.0

Affiliation: Shinshu University, Cornell University

Abstract

We report on the growing of metal-organic frameworks that are isoreticular and isostructural to UiO-66, onto cotton fabrics via a solvothermal method. Four different metal-organic frameworks (MOFs) (UiO-66, UiO-66-NH2, UiO-66-NDC, and UiO-67) were chosen as a case study. The presence of the UiO-based MOFs was confirmed through X-ray diffraction and Scanning Electron Microscopy. We used thermogravimetric analysis to quantify the amount of the MOF loading, which ranged from 0.8% to 2.6% m/m. We also explored the role of ligand size, growth time, and reaction temperature on the conformal coating of cotton fibers with these Zr-based MOFs. Cotton fabrics coated with Zr-based MOFs can find applications as selective filters in aggressive environments due to their enhanced chemical and thermal stabilities.

Highlights

Since their discovery over 20 years ago, more than 75,000 different metal-organic framework (MOF) structures have been synthesized, which makes them one of the most reported materials in the21st century’s scientific literature [1]
We bypassed the cellulose carboxylation step commonly reported as a necessary condition for growth MOF structures onto cotton fibers, showing that MOFs can be grown directly onto unmodified cotton fibers
We observed that longer ligands required of higher temperatures and longer reaction times to grow on the surface of the cotton fabrics

Summary

Introduction

Since their discovery over 20 years ago, more than 75,000 different metal-organic framework (MOF) structures have been synthesized, which makes them one of the most reported materials in the21st century’s scientific literature [1]. Since their discovery over 20 years ago, more than 75,000 different metal-organic framework (MOF) structures have been synthesized, which makes them one of the most reported materials in the. MOFs are highly crystalline and porous materials composed of metal ions or cluster cornerstones linked by organic molecules [2]. UiO-66, a MOF that contains a Zr6 O4 (OH) cluster coordinated to carboxyl groups, is thermally stable up to 500 ◦ C and chemically stable in water over a wide range of pH values [15,16,17]. In the particular case of UiO-66, isoreticular growth refers to an increase in the distances between Zr6 O4 (OH) clusters, while keeping the connectivity between the metal oxide cornerstones and the ligands. Isoreticular chemistry is of great relevance, as it can dictate the pore size of the resulting MOF structure [19,20,21,22,23]

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