Cellulose ionogels, a perspective of the last decade: A review

Hopson, Cynthia; Villar-Chavero, M. Mar; Domínguez, Juan C.; Alonso, M. Virginia; Oliet, Mercedes; Rodrı́guez, Francisco

doi:10.1016/j.carbpol.2021.118663

Cited by 36 publications

(33 citation statements)

References 101 publications

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“…Ionic liquids are largely employed as media for the dissolution of polysaccharides oriented toward gel-type materials which are formed through including these green solvents in the polysaccharide network matrix. Ionic liquid-cellulose gel materials (called cellulose ionogels) are a relatively new type of materials that combine cellulose as continuous solid phase component (called matrix) and ionic liquid as dispersed liquid phase [ 199 , 200 ]. Such macromolecular gel materials can find sustainable applications [ 199 ] such as catalysis, energy, electronics, medicine, food, cosmetics, and so on, given their versatile potential to be designed through creating new functional features at every component level (cellulose, ionic liquid, and any employed functional additives).…”

Section: Cellulose-based Gelsmentioning

confidence: 99%

Insights on Some Polysaccharide Gel Type Materials and Their Structural Peculiarities

Duceac¹,

Stanciu²,

Nechifor³

et al. 2022

Gels

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Global resources have to be used in responsible ways to ensure the world’s future need for advanced materials. Ecologically friendly functional materials based on biopolymers can be successfully obtained from renewable resources, and the most prominent example is cellulose, the well-known most abundant polysaccharide which is usually isolated from highly available biomass (wood and wooden waste, annual plants, cotton, etc.). Many other polysaccharides originating from various natural resources (plants, insects, algae, bacteria) proved to be valuable and versatile starting biopolymers for a wide array of materials with tunable properties, able to respond to different societal demands. Polysaccharides properties vary depending on various factors (origin, harvesting, storage and transportation, strategy of further modification), but they can be processed into materials with high added value, as in the case of gels. Modern approaches have been employed to prepare (e.g., the use of ionic liquids as “green solvents”) and characterize (NMR and FTIR spectroscopy, X ray diffraction spectrometry, DSC, electronic and atomic force microscopy, optical rotation, circular dichroism, rheological investigations, computer modelling and optimization) polysaccharide gels. In the present paper, some of the most widely used polysaccharide gels will be briefly reviewed with emphasis on their structural peculiarities under various conditions.

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Section: Cellulose-based Gelsmentioning

confidence: 99%

Insights on Some Polysaccharide Gel Type Materials and Their Structural Peculiarities

Duceac¹,

Stanciu²,

Nechifor³

et al. 2022

Gels

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“…Cellulose can be modified by esterification or etherification methods; this modification can lead to water solubility, viscosity enhancer, water binding ability, adhesiveness, film former, thickening agent, swelling, and emulsifying properties. These properties of modified or derivatives of cellulose lead to its wide applications [115,116]. Cellulose derivatives are preferred over cellulose because of their aqueous and organic solvents solubility [109].…”

Section: Properties Of Cellulosic Polymersmentioning

confidence: 99%

Cellulosic Polymers for Enhancing Drug Bioavailability in Ocular Drug Delivery Systems

et al. 2021

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One of the major impediments to drug development is low aqueous solubility and thus poor bioavailability, which leads to insufficient clinical utility. Around 70–80% of drugs in the discovery pipeline are suffering from poor aqueous solubility and poor bioavailability, which is a major challenge when one has to develop an ocular drug delivery system. The outer lipid layer, pre-corneal, dynamic, and static ocular barriers limit drug availability to the targeted ocular tissues. Biopharmaceutical Classification System (BCS) class II drugs with adequate permeability and limited or no aqueous solubility have been extensively studied for various polymer-based solubility enhancement approaches. The hydrophilic nature of cellulosic polymers and their tunable properties make them the polymers of choice in various solubility-enhancement techniques. This review focuses on various cellulose derivatives, specifically, their role, current status and novel modified cellulosic polymers for enhancing the bioavailability of BCS class II drugs in ocular drug delivery systems.

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“…[4,5] Generally, ionogels are prepared by loading ionic liquids (ILs) within a polymer network, in which the ILs enable ionic conduction while the polymer network serves as a solid supporting substrate. [6,7] Given that traditional ILs are usually expensive, nonbiodegradable and toxic or even harmful to human health when utilized as wearable devices, [8] deep eutectic solvents (DESs), as a novel class of ILs, have received considerable research attentions due to their comprehensive advantages including low price, simple synthesis, excellent biocompatibility, green origin, and negligible toxicity. [9,10] Hence, DESs show great promise as conductive media for the construction of cost-effective, biocompatible, and green ionogels, offering new opportunities for flexible and wearable electronic devices.…”

Section: Introductionmentioning

confidence: 99%

Highly Conductive, Transparent, Adhesive, and Self‐Healable Ionogel Based on a Deep Eutectic Solvent with Widely Adjustable Mechanical Strength

Jiang

Zhang

et al. 2022

Macromol. Rapid Commun.

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Ionogels have attracted intensive attentions as promising flexible conductive materials. However, simultaneous integration of excellent mechanical properties, high conductivity, outstanding self‐healing ability, and strong adhesiveness is still challenging. Here, an ingenious composition design is proposed to address this long‐standing challenge of ionogels. High‐performance PEI/PAA/CMC ionogels, consist of a loosely cross‐linked poly(acrylic acid) (PAA) network, dynamically cross‐linked network based on polycationic polyethyleneimine (PEI) and polyanionic PAA, and carboxymethyl cellulose (CMC) reinforcing filler, are formed in a deep eutectic solvent (DES) composed of choline chloride and urea. Benefiting from the loose PAA network and dynamic noncovalent interactions, ionogels with both highly enhanced mechanical robustness and excellent conductivity are obtained at high loading of DES, overcoming the strength‐ductility/conductivity trade‐off dilemma. By adjusting PEI/PAA mass ratio, the tensile strength and strain of PEI/PAA/CMC ionogels are effectively controlled in a wide range of 0.15–7.9 MPa and 232–1161%, respectively, while maintaining the desirable conductivity of ≈10−4 S cm−1. Besides, healed tensile strength over 2.1 MPa and adhesion strength up to 0.2 MPa are achieved for the PEI0.06/PAA0.25/CMC0.01 ionogel. The delicate design strategy provides a feasible approach to prepare ionogels with outstanding comprehensive performance, which have potential for applications in flexible electronics.

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Cellulose ionogels, a perspective of the last decade: A review

Cited by 36 publications

References 101 publications

Insights on Some Polysaccharide Gel Type Materials and Their Structural Peculiarities

Insights on Some Polysaccharide Gel Type Materials and Their Structural Peculiarities

Cellulosic Polymers for Enhancing Drug Bioavailability in Ocular Drug Delivery Systems

Highly Conductive, Transparent, Adhesive, and Self‐Healable Ionogel Based on a Deep Eutectic Solvent with Widely Adjustable Mechanical Strength

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