Nonwoven fiber mats with thermo-responsive permeability to inorganic and organic electrolytes

Cutright, Camden C.; Finkelstein, R. S.; Orlowski, Elliot; McIntosh, Evan; Brotherton, Zach; Fabiani, Thomas; Khan, Saad A.; Genzer, Jan; Menegatti, Stefano

doi:10.1016/j.memsci.2020.118439

Cited by 13 publications

(21 citation statements)

References 41 publications

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“…36,37 To prepare functionalized membranes, nowadays usually porous organic or inorganic membranes are subsequently modied with linear PNIPAM chains or with PNIPAM based microgels. [38][39][40][41][42][43][44][45] However, all these approaches require multiple-step procedures and are limited to commercially available supports for functionalization. In contrast to that, a free-standing cross-linked microgel lm or membrane would offer many advantages for surface modications, especially when three-dimensional objects or wells should be coated or wrapped.…”

Section: Introductionmentioning

confidence: 99%

UV cross-linked smart microgel membranes as free-standing diffusion barriers and nanoparticle bearing catalytic films

et al. 2021

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Section: Introductionmentioning

confidence: 99%

UV cross-linked smart microgel membranes as free-standing diffusion barriers and nanoparticle bearing catalytic films

et al. 2021

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“…Besides commonly used LCST polymers such as poly(N-substituted acrylamide) and poly(vinylamide), and including poly(oligoethylene glycol (meth)acrylate) families, there are also others that present similar temperature-responsive behavior when macromolecular hydrophilic and hydrophobic balance is satisfied [ 74 ]. This feature could be useful in drug delivery applications [ 72 , 73 , 74 , 75 ], designing thermoreactive self-folding materials [ 76 ], the controlled permeability of fiber coatings [ 77 ] and membranes [ 78 ].…”

Section: Classifications and Underlying Mechanisms Of Intelligent Polymersmentioning

confidence: 99%

Intelligent Polymers, Fibers and Applications

Reddy

Jayathilaka

et al. 2021

Polymers

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Intelligent materials, also known as smart materials, are capable of reacting to various external stimuli or environmental changes by rearranging their structure at a molecular level and adapting functionality accordingly. The initial concept of the intelligence of a material originated from the natural biological system, following the sensing–reacting–learning mechanism. The dynamic and adaptive nature, along with the immediate responsiveness, of the polymer- and fiber-based smart materials have increased their global demand in both academia and industry. In this manuscript, the most recent progress in smart materials with various features is reviewed with a focus on their applications in diverse fields. Moreover, their performance and working mechanisms, based on different physical, chemical and biological stimuli, such as temperature, electric and magnetic field, deformation, pH and enzymes, are summarized. Finally, the study is concluded by highlighting the existing challenges and future opportunities in the field of intelligent materials.

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“…When assembled as a monolayer grafted to the surface, the P(NIPAm-co-AA) microgels afforded a maximum thickness of only 1 µm into the pore space (Figure 13), in line with the results by Majcen. [73] A drawback of the grafting through method is that the substrate must be present during microgel synthesis, posing technical limitations on the versatility and scalability of the process.…”

Section: Grafting Microgels Through and From The Substratementioning

confidence: 99%

“…Cutright et al further explored this mechanism by loading P(NIPAm-co-AA) microgels within PP nonwoven fiber mats and monitored the flux variation at acidic and neutral pH. The team showed that the electrostatic interactions between the solute and the anionic microgels regulate permeation more than physical pore-blocking when the pores are larger than the microgels (≈20 µm vs 2 µm); [73] conversely, when the pore size is comparable to the swollen microgel size, physical blocking becomes the main determinant of flux. Mohsen et al employed a microgel flocculation mechanism at high temperature and low pH to load P(NIPAm-co-AA) microgels into PTFE filtration membranes with 5-µm pores cooling and pH increase swelled the microgel network and blocked the transmembrane flux completely through pore occlusion.…”

Section: (21 Of 32)mentioning

confidence: 99%

“…[70,71] Filtration, electrospinning, grafting "through" polymerization, freezedrying, and phase separation are time-intensive batch processes reserved for fabricating hydrophobic 3D scaffolds with microgels incorporated directly within the composite. [2,17,[72][73][74][75] Depending on the microgel/substrate interaction potential and the concentration of microgels in suspension, employing different deposition techniques yields coatings with different properties and behavior. Often, a trade-off exists between film homogeneity and reproducibility versus scalability and productivity of the deposition process.…”

Section: Introductionmentioning

confidence: 99%

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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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Nonwoven fiber mats with thermo-responsive permeability to inorganic and organic electrolytes

Cited by 13 publications

References 41 publications

UV cross-linked smart microgel membranes as free-standing diffusion barriers and nanoparticle bearing catalytic films

UV cross-linked smart microgel membranes as free-standing diffusion barriers and nanoparticle bearing catalytic films

Intelligent Polymers, Fibers and Applications

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

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