Dual-Responsive Microgels for Structural Repair and Recovery of Nonwoven Membranes for Liquid Filtration

Ramesh, Srivatsan; Davis, J.; Roros, Alexandra; Eiben, Justin; Fabiani, Thomas; Smith, Ryan; Reynolds, Lewis; Pourdeyhimi, Behnam; Khan, Saad A.; Genzer, Jan; Menegatti, Stefano

doi:10.1021/acsapm.0c01360

Cited by 6 publications

(7 citation statements)

References 31 publications

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“…The microgels were synthesized as described in Ramesh et al via precipitation polymerization of NIPAM, AA, and HEA in water, using SDS as surfactant and BIS as cross-linker (Supporting Information (SI), Figure S1A). The nominal mol % of the monomers, surfactant, and cross-linker utilized in the polymerization mixture are listed in Table .…”

Section: Methodsmentioning

confidence: 99%

“…N -(4-Benzoylphenyl) acrylamide (BPAm) and P(NIPAm- co -BPAm) were synthesized via free radical polymerization using a 98:2 mixture of NIPAm and BPAm (SI, Figure S1B) as described by Ramesh et al Briefly, acryloyl chloride was added dropwise to a basic solution of 4-aminobenzophenone and TEA in DMF and allowed to react for 24 h at room temperature under constant stirring. The solution was precipitated in water, washed with a saturated solution of NaHCO 3 , and lyophilized to obtain BPAm as a yellow powder.…”

Section: Methodsmentioning

confidence: 99%

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Nonwoven Membranes with Infrared Light-Controlled Permeability

Ramesh

Davis

Roros

et al. 2022

ACS Appl. Mater. Interfaces

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This study presents the development of the first composite nonwoven fiber mats (NWFs) with infrared light-controlled permeability. The membranes were prepared by coating polypropylene NWFs with a photothermal layer of poly(N-isopropylacrylamide) (PNIPAm)-based microgels impregnated with graphene oxide nanoparticles (GONPs). This design enables “photothermal smart-gating” using light dosage as remote control of the membrane’s permeability to electrolytes. Upon exposure to infrared light, the GONPs trigger a rapid local increase in temperature, which contracts the PNIPAm-based microgels lodged in the pore space of the NWFs. The contraction of the microgels can be reverted by cooling from the surrounding aqueous environment. The efficient conversion of infrared light into localized heat by GONPs coupled with the phase transition of the microgels above the lower critical solution temperature (LCST) of PNIPAm provide effective control over the effective porosity, and thus the permeability, of the membrane. The material design parameters, namely the monomer composition of the microgels and the GONP-to-microgel ratio, enable tuning the permeability shift in response to IR light; control NWFs coated with GONP-free microgels displayed thermal responsiveness only, whereas native NWFs showed no smart-gating behavior at all. This technology shows potential toward processing temperature-sensitive bioactive ingredients or remote-controlled bioreactors.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Nonwoven Membranes with Infrared Light-Controlled Permeability

Ramesh

Davis

Roros

et al. 2022

ACS Appl. Mater. Interfaces

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“…Regarding hybrid microgels containing magnetic nanoparticles, Rames et al developed a platelet-like stimuli-responsive microgel suspension based on poly(NIPAM-co-AA) that responds to the magnetic field and UV photocuring. The objective of the work was to repair, in a remotely controlled way, nonwoven fiber mats composed of commercially available polypropylene (PP) and polybutylene terephthalate (PBT) in order to recover their native morphological and functional properties [ 34 ].…”

Section: Applications Of Microgelsmentioning

confidence: 99%

“…The evolution arisen from the control over the microgel synthesis (monomer and cross-linker reactivities) allowed the design of different microgel architecture: core-shell, multicore-shell, and hollow microgels, among others [ 33 , 34 , 35 , 36 , 37 ]. In that way, microgels with improved properties and additional functions can be prepared; these could respond, i.e., swell and/or shrink, in a controlled and desired manner to environmental changes or be programmed to have a particular swelling behavior.…”

Section: Introductionmentioning

confidence: 99%

Rheology Applied to Microgels: Brief (Revision of the) State of the Art

Echeverría

Mijangos

2022

Polymers

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The ability of polymer microgels to rapidly respond to external stimuli is of great interest in sensors, lubricants, and biomedical applications, among others. In most of their uses, microgels are subjected to shear, deformation, and compression forces or a combination of them, leading to variations in their rheological properties. This review article mainly refers to the rheology of microgels, from the hard sphere versus soft particles’ model. It clearly describes the scaling theories and fractal structure formation, in particular, the Shih et al. and Wu and Morbidelli models as a tool to determine the interactions among microgel particles and, thus, the viscoelastic properties. Additionally, the most recent advances on the characterization of microgels’ single-particle interactions are also described. The review starts with the definition of microgels, and a brief introduction addresses the preparation and applications of microgels and hybrid microgels.

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“…Ramesh et al repaired damaged polypropylene (PP) nonwoven fibermats with P(NIPAm-co-AA) microgels by co-depositing the microgels with a P(NIPAm-co-benzophenone acrylamide) copolymer. [206] Subsequent drying and UV crosslinking crosslinked the microgels and anchored them to the nonwoven, thus restoring the integrity, mechanical properties, and permeability of native PP.…”

Section: Covalent Modificationmentioning

confidence: 99%

Surface‐Bound Microgels for Separation, Sensing, and Biomedical Applications

Cutright

Harris

Ramesh

et al. 2021

Adv Funct Materials

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This study presents a comprehensive survey of microgel-coated materials and their functional behavior, describing the complex interplay between the physicochemical and mechanical properties of the microgels and the chemical and morphological features of substrates. The cited literature is articulated in four main sections: i) properties of 2D and 3D substrates, ii) synthesis, modification, and characterization of the microgels, iii) deposition techniques and surface patterning, and iv) application of microgel-coated surfaces focusing on separations, sensing, and biomedical applications. Each section discussesby way of principles and examples -how the various design parameters work in concert to deliver functionality to the composite systems. The case studies presented herein are viewed through a multi-scale lens. At the molecular level, the surface chemistry and the monomer make-up of the microgels endow responsiveness to environmental and artificial physical and chemical cues. At the micro-scale, the response effects shifts in size, mechanical, and optical properties, and affinity towards species in the surrounding liquid medium, ranging from small molecules to cells. These phenomena culminate at the macro-scale in measurable, reversible, and reproducible effects, aiming in a myriad of directions, from lab-scale to industrial applications.

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Dual-Responsive Microgels for Structural Repair and Recovery of Nonwoven Membranes for Liquid Filtration

Cited by 6 publications

References 31 publications

Nonwoven Membranes with Infrared Light-Controlled Permeability

Nonwoven Membranes with Infrared Light-Controlled Permeability

Rheology Applied to Microgels: Brief (Revision of the) State of the Art

Surface‐Bound Microgels for Separation, Sensing, and Biomedical Applications

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