Interaction of Cationic, Anionic, and Nonionic Macroraft Homo- and Copolymers with Laponite Clay

Chaparro, Thaíssa de Camargo; Silva, Rodrigo Duarte; Monteiro, Igor Stefanichen; Barros‐Timmons, Ana; Giudici, Reinaldo; Santos, Amilton M.; Bourgeat‐Lami, Élodie

doi:10.1021/acs.langmuir.9b01987

Cited by 19 publications

(46 citation statements)

References 80 publications

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“…Reinitiation and propagation of the hydrophobic block can occur from either the anionic (for M1, M2 and M6) or the non-ionic (M3, M4 and M5) block. As shown in our previous work, 24 each macroRAFT chosen can interact with Laponite® via different adsorption mechanisms. PEG is known to strongly adsorb on the basal surface of the clay particles.…”

Section: Resultsmentioning

confidence: 77%

“…In this work, amphipathic macroRAFT agents, carrying a reactivatable thiocarbonylthio functionality and suitable anchor groups, have been carefully designed to interact with Laponite® particles, control the subsequent radical copolymerization of MMA with BA and stabilize the growing hybrid particles. The synthesis of these living macromolecules and their ability to interact with the Laponite® surface have already been shown in a previous study, 24 which is used as the basis for the present work. The focus now is to evaluate the capacity of these macromolecules to control the stability and morphology of nanocomposite latexes containing Laponite® platelets via the REEP method.…”

Section: Resultsmentioning

confidence: 85%

“…Polymer Chemistry synthesized using 4-cyano-4-thiothiopropylsulfanyl pentanoic acid (TTC) as the RAFT agent and purified as described previously. 24 Their synthesis followed a controlled behavior as indicated by a linear evolution of molar mass with time and low dispersities (Đ = M w /M n ), ensuring that they could be further chain extended. Laponite® RD (BYK Additives Ltd) was used as the clay component.…”

Section: Papermentioning

confidence: 99%

“…value for disc-or dumbbell-shaped objects (such as Laponite® platelets and some of the hybrid particles observed in this work), it can be considered as a useful tool for comparing the samples. Particle morphology was determined by cryogenic transmission electron microscopy (cryo-TEM) using a Philips CM120 transmission electron micro- Table 1 Structure, molar mass of each macroRAFT agent (determined using the individual monomer conversion obtained by 1 H NMR analysis), experimental molar mass (obtained by SEC) and dispersity of macroRAFT agents used in this work, and their adsorbed amount at saturation (q max ) according to the Langmuir model 24…”

Section: Characterizationmentioning

confidence: 99%

“…It follows a previous study in which RAFT copolymers have been designed and synthesized by solution polymerization and evaluated in an adsorption study onto Laponite®. 24 In the present work, emulsion copolymerization of MMA with BA was performed in the presence of Laponite® platelets modified with AA-, PEG-or PEGA-and BA-based macroRAFT copolymers to generate clay/polymer nanocomposite latex particles under semi-batch surfactant-free conditions.…”

Section: Introductionmentioning

confidence: 99%

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Laponite®-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology control

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Section: Resultsmentioning

confidence: 77%

Section: Resultsmentioning

confidence: 85%

Section: Papermentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Laponite®-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology control

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Environment Adaptable Nanocomposite Organohydrogels for Multifunctional Epidermal Sensors

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Gao

et al. 2022

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The new generations of wearable materials need to concurrently possess satisfactory biocompatibility and conformability with skin. Different from electronic conductors, ionic conductors report signals using ions like human skin. [3] Ionic conductors can perform many functions that are difficult for electronic conductors. Remarkably, high elastic deformation, high stretchability, and biocompatibility are important parameters for the new-generation ionic conductor applications. [2,4] A flexible device that uses ions as a carrier can be called ionic skin (i-skin). [5] Typical i-skin adopted hydrogel as elastic matrix and deliquescent salts to provide ions such as NaCl, [6] KCl, [7] FeCl 3 , [8] etc. Nonetheless, the water-based materials are particularly sensitive to humidity and temperature, which inevitably leads to dehydration or deliquescent, or even freezing and thus limits the long-term stability of ionic hydrogel conductors. Although the introduction of salts can improve the freezing tolerance of hydrogels, high concentration of ions tends to destroy the interaction inside the network such as hydrogen bonding and ionic bonding which resulting in the poor mechanical strength. [6,9] Ionogel conductors have emerged as another optional materials due to their nonvolatility, high thermal stability, and low temperature resistance. [10,11] However, the inherent toxicity of ionic liquids is a hidden danger for wearable devices which contact with living organism.Natural skin can maintain its flexibility and functionality in harsh environments like freezing and over-heating. For instance, rainbow smelt (Osmerus mordax) have the ability to adapt to very cold water temperatures. This is because their tissues express anti-freeze proteins and glycerol to prevent freezing at sub-zero temperatures. [12] Especially, glycerol (1,2,3-propanetriol or glycerin) as a transparent, odorless and nontoxic liquid, has been widely used in food, cosmetics and pharmaceuticals. After introducing glycerol into water, the hydrogen bonds between H 2 O molecules was disrupted and strong hydrogen bonds were formed between H 2 O molecules and glycerol molecules in the binary solution. [13] Benefitting from this interaction, the obtained organohydrogels can be stored in dry air or low temperature for a long time without losing their mass and flexibility. [14] For instance, anti-freezing conductive double-network organohydrogels were fabricated by soaking a poly(2-acrylamido-2-methylpropane sulfonic Electronic skins, as a revolution in artificial intelligence, have drawn intensive attention in smart prosthetic devices, wearable health monitors and intelligent robot manufacturing. Conductive hydrogels as building blocks have been highlighted in artificial skin research. Nevertheless, the main challenges of hydrogel-based electronics are poor temperature tolerance, weak mechanical robustness and limited stretchability. Herein, an organohydrogel is fabricated with "soft and hard" synergistic networks by combining "soft" polyacryl amide (PAM) and catec...

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Recent advances in nano‐scaffolds for tissue engineering applications: Toward natural therapeutics

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et al. 2023

WIREs Nanomed Nanobiotechnol

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Among the promising methods for repairing or replacing tissue defects in the human body and the hottest research topics in medical science today are regenerative medicine and tissue engineering. On the other hand, nanotechnology has been expanded into different areas of regenerative medicine and tissue engineering due to its essential benefits in improving performance in various fields. Nanotechnology, a helpful strategy in tissue engineering, offers new solutions to unsolved problems. Especially considering the excellent physicochemical properties of nanoscale structures, their application in regenerative medicine has been gradually developed, and a lot of research has been conducted in this field. In this regard, various nanoscale structures, including nanofibers, nanosheets, nanofilms, nano‐clays, hollow spheres, and different nanoparticles, have been developed to advance nanotechnology strategies with tissue repair goals. Here, we comprehensively review the application of the mentioned nanostructures in constructing nanocomposite scaffolds for regenerative medicine and tissue engineering.This article is categorized under: Nanotechnology Approaches to Biology > Nanoscale Systems in Biology Implantable Materials and Surgical Technologies > Nanotechnology in Tissue Repair and Replacement Diagnostic Tools > Biosensing

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Interaction of Cationic, Anionic, and Nonionic Macroraft Homo- and Copolymers with Laponite Clay

Cited by 19 publications

References 80 publications

Laponite®-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology control

Laponite®-based colloidal nanocomposites prepared by RAFT-mediated surfactant-free emulsion polymerization: the role of non-ionic and anionic macroRAFT polymers in stability and morphology control

Environment Adaptable Nanocomposite Organohydrogels for Multifunctional Epidermal Sensors

Recent advances in nano‐scaffolds for tissue engineering applications: Toward natural therapeutics

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