Multi-Purpose Cellulosic Ionogels

Smith, Chip J.; Wagle, Durgesh V.; O’Neill, Hugh; Evans, Barbara R.; Baker, Sheila N.; Baker, Gary A.

doi:10.1021/bk-2017-1250.ch006

Cited by 3 publications

(1 citation statement)

References 35 publications

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“…In the current work, we introduce a new class of eutectogel inspired by our previous work with bacterial cellulose ionogels (BCIGs). Specifically, we incorporate the DES glyceline within a bacterial cellulose host to generate a novel type of eutectogel we subsequently denote a glyceline bacterial cellulose eutectogel (Gly-BCEG). − The structure of the bacterial cellulose was examined through the methods of X-ray diffraction (XRD) and small-angle neutron scattering (SANS) to ascertain changes induced by glyceline to the cellulose crystallinity and entanglement. Diffusion ordered spectroscopy (DOSY) was utilized to study the diffusive properties of glyceline within the eutectogel.…”

Section: Introductionmentioning

confidence: 99%

Combined Small-Angle Neutron Scattering, Diffusion NMR, and Molecular Dynamics Study of a Eutectogel: Illuminating the Dynamical Behavior of Glyceline Confined in Bacterial Cellulose Gels

et al. 2020

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A deep eutectic solvent (DES) entrapped in a bacterial cellulose (BC) network gives rise to a gelatin-like, selfsupported material termed a bacterial cellulose eutectogel (BCEG).Although this novel material holds potential for numerous industrial, environmental, energy, or medical applications, little is known about the structural features or dynamical behavior within a eutectogel. In this work, we employ X-ray diffraction (XRD), nuclear magnetic resonance (NMR), and small-angle neutron scattering (SANS) to probe the structural and diffusive behavior of the prevailing DES glyceline (1:2 molar ratio of choline chloride:glycerol) confined within bacterial cellulose. XRD investigations demonstrate that the bacterial cellulose maintains its crystallinity even as the glyceline content approaches 95 wt % in the BCEG, an outcome corroborated by molecular dynamics (MD) simulations, which suggest minimal changes in the structural features of the cellulose chains due to the presence of glyceline. SANS measurements reveal a significant reduction in the radius of gyration (R g ) for BC in a BCEG compared to its hydrogel analogue, indicating a collapse in the microfibrillar structure that we attribute to removal of waters from the interfibrillar space due to a higher affinity of DES for water than for cellulose. Furthermore, SANS experiments suggest that the vast majority of DES is hosted within large micropores in the BCEG (i.e., mesoscopic confinement). Interestingly, proton NMR experiments disclose faster diffusional rates for choline and glycerol entrapped in a BCEG compared to neat glyceline. MD simulations offer the possible explanation that this diffusional acceleration results from significant migration of chloride from the bulk to cellulose microfibrillar surfaces, thereby reducing hydrogen bonding with choline and glycerol partners. This study provides the first comprehensive investigation into the structure and diffusional dynamics of glyceline within a eutectogel, offering insights into mass transport that should be useful for tailoring these novel materials to potential applications.

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Section: Introductionmentioning

confidence: 99%

Combined Small-Angle Neutron Scattering, Diffusion NMR, and Molecular Dynamics Study of a Eutectogel: Illuminating the Dynamical Behavior of Glyceline Confined in Bacterial Cellulose Gels

et al. 2020

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Flexible and Robust Bacterial Cellulose‐Based Ionogels with High Thermoelectric Properties for Low‐Grade Heat Harvesting

Liu

Fan

et al. 2021

Adv Funct Materials

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The utilization of low-grade and abundant thermal sources based on thermoelectric (TE) materials is crucial for the development of a sustainable society. However, high-performance thermoelectric materials with biodegradable, mass-productive, and low-cost features are rarely reported. Here, from the perspective of sustainable development, natural polymer (bacterial cellulose, BC), and "green" solvent (ionic liquids, ILs) are combined to achieve a transparent, flexible, and robust ionogel (BCIGs) by using a facile and versatile modified co-solvent evaporation method. The proposed BCIGs with 95 wt% 1-ethyl-3-methylimidazolium dicyanamide ([EMIm][DCA]) can have high tensile strength (3.05 MPa), skin-like mechanical stretchability (40.99%), and obvious adhesivity. The BCIGs are thermally stable up to 250 °C. They also exhibit a high ionic conductivity (2.88 × 10 −2 S cm −1 ), high ionic thermovoltage (18.04 mV K −1 ), and low thermal conductivity (0.21 W m −1 K −1 ), resulting in the great ionic figure of merit (ZT i ) of 1.33 at room temperature. Through the model of mesoscopic confined ion transportation under a thermal gradient, it is attributed the great thermoelectric properties to the synergistic effect between ion-cellulose interaction and ion-ion interaction. Moreover, a flexible ionic thermoelectric capacitor (ITEC) device is also demonstrated, showing the potential of the BCIGs in wearable energy supply.

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Mesoscopic confined ionic thermoelectric materials with excellent ionic conductivity for waste heat harvesting

Fan

Liu

et al. 2022

Chemical Engineering Journal

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Multi-Purpose Cellulosic Ionogels

Cited by 3 publications

References 35 publications

Combined Small-Angle Neutron Scattering, Diffusion NMR, and Molecular Dynamics Study of a Eutectogel: Illuminating the Dynamical Behavior of Glyceline Confined in Bacterial Cellulose Gels

Combined Small-Angle Neutron Scattering, Diffusion NMR, and Molecular Dynamics Study of a Eutectogel: Illuminating the Dynamical Behavior of Glyceline Confined in Bacterial Cellulose Gels

Flexible and Robust Bacterial Cellulose‐Based Ionogels with High Thermoelectric Properties for Low‐Grade Heat Harvesting

Mesoscopic confined ionic thermoelectric materials with excellent ionic conductivity for waste heat harvesting

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