Air, Water Vapor, and Aerosol Transport through Textiles with Surface Functional Coatings of Metal Oxides and Metal–Organic Frameworks

Abstract

Currently, air permeable chemical/biological (CB) protective garments are based on activated carbon technology, which reduces moisture vapor transport needed for evaporative cooling and has potential to absorb and concentrate toxic materials. Researchers are exploring classes of sorbent materials that can selectively accumulate and decompose target compounds for potential to enhance protective suits and allow for novel filtration devices. Here, the metal–organic frameworks (MOFs) UiO-66-NH2 and HKUST-1 have been identified as such materials. To better understand how MOFs can perform in future CB protective systems, atomic layer deposition (ALD) and solution deposition were used to modify nonwoven polypropylene and flame-resistant fabrics with HKUST-1 and UiO-66-NH2. Air permeation, water vapor transport, filtration efficiency, and chemical reactivity against chemical agent simulants were assessed in relation to ALD thickness and MOF crystal size. MOF deposition on substrates decreased both air and chemical permeation while increasing filtration efficiency and chemical sorption. Moisture vapor transport was not affected by MOF growth on substrates, which is promising when considering thermal properties of protective garments. Future work should continue to explore how MOF deposition onto fiber and textile substrates impacts transport properties and chemical absorbance.

Highly Breathable Chemically Protective MOF‐Fiber Catalysts

“…[65] This gives rise to higher GD loading of 0.22 mol kg MOF+Fiber −1 versus 0.13 and <0.1 mol kg MOF+Fiber −1 of PP@TiO 2 @MOF(3) HCl and PP@TiO 2 , respectively. The higher adsorption capacity of gaseous GD by MOF-textile composites with a higher MOF mass fraction is in good agreement with previous results with ammonia to HKUST-1 coated nonwoven fibers [66] and chlorine to UiO-66-NH 2 coated electrospun fibers. [61,67] Thus, PP@TiO 2 @MOF(3) composite is promising in that it shows not only the rapid hydrolysis reactivity for both simulant DMNP and agent GD, but also a substantial physisorption capacity of GD with a delayed internal mass transport through the fiber composites.…”

An Advanced Dual‐Function MnO2‐Fabric Air Filter Combining Catalytic Oxidation of Formaldehyde and High‐Efficiency Fine Particulate Matter Removal

“…This finding is consistent with recent a study showing the additional metal oxides have relatively small impact on vapor transport and air permeability. [58] To further improve filtration efficiency, a corona charging process was employed on MnO 2 @ MO@PP filters. For all MnO 2 @MO@PP filters, the values for PM 2.5 and PM 10 exceeded 99.95% ( Figure S9a, Supporting Information), whereas the pressure drop remains constant ( Figure S9b, Supporting Information), verifying high-efficiency filtration.…”

Boosting dimensional stability and proton conductive of proton exchange membrane by introducing SO3H-UiO-66 coated nanofibers

“…2b, PPNF had an XRD pattern that is consistent with the literature. Obviously, the in-situ growth weakens the crystallization behavior of SU6, 8 and the diffraction peaks attributable to SU6 at 2Theta=6.0°, 7.4°, 8.5° are still observed in the XRD pattern of SU6@PPNF. Above results prove the successful preparation of SU6@PPNF.…”