Cellulose Acetate-Poly(<i>N</i>-isopropylacrylamide)-Based Functional Surfaces with Temperature-Triggered Switchable Wettability

Ganesh, V.; Ranganath, Anupama Sargur; Sridhar, R.; Raut, Hemant Kumar; Jayaraman, Sundaramurthy; Sahay, Rahul; Ramakrishna, Seeram; Baji, Avinash

doi:10.1002/marc.201500037

Cited by 29 publications

(19 citation statements)

References 34 publications

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“…In our previous work, high CA of 132 C is attributed to the large surface area of the brous membrane. 24,36 In the present work, measurements are performed on crosslinked PNIPAM. The reason for reduced CA is attributed to the decrease in surface roughness resulting from the fusing of bers at the cross-over points in a membrane (Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermoresponsive electrospun membrane with enhanced wettability

et al. 2017

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This study investigated the switchable wettability behavior of poly-N-(isopropyl acrylamide) (PNIPAM) and poly-(vinylidene fluoride) (PVDF) blend membranes that were fabricated using electrospinning. The wettability of the membranes was determined by water contact angle measurements. The wettability of the membranes was controlled by varying the concentration of PNIPAM in the blend. The results demonstrated that the addition of PVDF to the PNIPAM did not change the thermoresponsive behavior of PNIPAM. All PNIPAM/PVDF blend samples switched from hydrophilic to hydrophobic state when the temperature was increased from room temperature to 40 C. However, blend samples with 25 wt% PNIPAM were demonstrated to be more hydrophilic and hydrophobic compared to other samples at room temperature and elevated temperature respectively. This was attributed to the phase separation of the polymers that resulted in domains with drastically different surface energies on the surface of the fibers.

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Section: Resultsmentioning

confidence: 99%

Thermoresponsive electrospun membrane with enhanced wettability

et al. 2017

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“…Thermoresponsive properties of several polymers grafted to the material surface, such as poly(N‐isopropylacrylamide), are also widely used . In this case, the speed of wettability modulation is significantly higher, but the application of heating/cooling as external stimuli restricts the potential benefits of this approach.…”

Section: Introductionmentioning

confidence: 99%

Fast and Reproducible Wettability Switching on Functionalized PVDF/PMMA Surface Controlled by External Electric Field

Guselnikova

Švanda

Postnikov

et al. 2016

Adv Materials Inter

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In this paper, the novel material with controllable wettability switching triggered by external electric field is developed. The material is based on the piezopolymer blend of poly(methyl methacrylate) (PMMA) and polyvinylidene difluoride (PVDF), grafted with various hydrophobic and hydrophilic molecules to alter the initial wettability of polymer films. Organic functional groups are grafted on the blend surface via formation of covalent bonds between PMMA and arenediazonium tosylates. The surface chemical structure and morphology of prepared samples are studied by X‐ray photoelectron spectroscopy, UV–vis, and attenuated total reflection infra red (ATR‐IR) spectroscopies, atomic force microscopy (AFM), and confocal microscopy. Attachment of gold nanoparticles to grafted thiol chemical groups is additionally used to confirm the modification procedure. Application of external stimuli in the form of the electric field leads to dramatic changes in water contact angle. Wettability switching is found to be extremely fast and completely repeatable without the destructions of the polymer film. Mechanism of switching is attributed to the morphological smoothening of piezoelectric responsible composite PVDF–PMMA under the application of external stimuli.

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“…The PNIPAAm phase transition has been used to switch between hydrophobic and hydrophilic environments 111. The same concept was successfully introduced in a polymer decorated membrane to separate oil‐in‐water emulsions in a controlled way 112.…”

Section: Aqueous Stimuli‐responsive Materialsmentioning

confidence: 99%

Design Principles for Aqueous Interactive Materials: Lessons from Small Molecules and Stimuli‐Responsive Systems

et al. 2020

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Interactive materials are at the forefront of current materials research with few examples in the literature. Researchers are inspired by nature to develop materials that can modulate and adapt their behavior in accordance with their surroundings. Stimuli‐responsive systems have been developed over the past decades which, although often described as “smart,” lack the ability to act autonomously. Nevertheless, these systems attract attention on account of the resultant materials' ability to change their properties in a predicable manner. These materials find application in a plethora of areas including drug delivery, artificial muscles, etc. Stimuli‐responsive materials are serving as the precursors for next‐generation interactive materials. Interest in these systems has resulted in a library of well‐developed chemical motifs; however, there is a fundamental gap between stimuli‐responsive and interactive materials. In this perspective, current state‐of‐the‐art stimuli‐responsive materials are outlined with a specific emphasis on aqueous macroscopic interactive materials. Compartmentalization, critical for achieving interactivity, relies on hydrophobic, hydrophilic, supramolecular, and ionic interactions, which are commonly present in aqueous systems and enable complex self‐assembly processes. Relevant examples of aqueous interactive materials that do exist are given, and design principles to realize the next generation of materials with embedded autonomous function are suggested.

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Cellulose Acetate-Poly(N-isopropylacrylamide)-Based Functional Surfaces with Temperature-Triggered Switchable Wettability

Cited by 29 publications

References 34 publications

Thermoresponsive electrospun membrane with enhanced wettability

Thermoresponsive electrospun membrane with enhanced wettability

Fast and Reproducible Wettability Switching on Functionalized PVDF/PMMA Surface Controlled by External Electric Field

Design Principles for Aqueous Interactive Materials: Lessons from Small Molecules and Stimuli‐Responsive Systems

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