Facile preparation and characterization of sodium alginate/graphite conductive composite hydrogel

Qu, Bing; Li, Junrong; Xiao, Huining; He, Beihai; Qian, Liying

doi:10.1002/pc.23502

Cited by 13 publications

(9 citation statements)

References 33 publications

(35 reference statements)

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“…However, it still remains several orders of magnitude lower than previously reported for other composite systems, even with much lower weight fractions of filler . Although, it has been proposed that cross‐linking alginate with calcium facilitates distribution of graphite into hydrogel matrix thereby promoting electrical conductivity , our results suggest that divalent metal ion‐polymer, divalent metal ion‐rGO, and rGO‐divalent metal ion‐polymer interactions, preclude the formation of a connected graphene network that is required to establish effective conductive paths as explained by the classical percolation theory . We further discuss filler‐polymer interactions in the Discussion section.…”

Section: Resultsmentioning

confidence: 54%

Composition dependent properties of graphene (oxide)‐alginate biopolymer nanocomposites

et al. 2016

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We report on the thermal, electrical and mechanical properties of alginate biopolymer nanocomposites prepared by solution casting with various amounts of graphene oxide (GO) or reduced graphene oxide (rGO). Our data shows that the thermal stability of alginate nanocomposites can be improved by the introduction of cross-linking through divalent metal cations, albeit that under these conditions little influence by the amount of rGO remains. On the other hand, the electrical conductivity of divalent metal ion cross-linked-rGO improves approximately 10 orders of magnitude with increasing weight fraction of rGO, whereas it declines for Sodium alginate-GO composites. In addition, storage moduli and glass to rubber transition temperatures show strong composition dependence as a consequence of complex interactions of the ions with both polymer and filler. We propose a mechanical model that allows for the accurate prediction of reinforcement by GO sheets in Sodium alginate-GO composites taking into account the orientational order of the sheets. Creep tests reveal the complex nature of multiple stress relaxation mechanisms in the nanocomposites although the stretched exponential Burgers' model accurately describes short time creep compliance.2

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Section: Resultsmentioning

confidence: 54%

Composition dependent properties of graphene (oxide)‐alginate biopolymer nanocomposites

et al. 2016

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“…The reference numbers in the figure are from Table S3 (Supporting Information). ( [ 1–4,6,8–13,17–20,23,24 ] , [This work]: Ionic conduction;: [ 2c,5,7,14,15,16,21,22,25–30 ] Electronic conduction). c) The loading‐unloading curves of 6000 s (300 cycles).…”

Section: Resultsmentioning

confidence: 99%

“…Conductive hydrogels can be divided into electronic conductive hydrogels and ionic conductive hydrogels according to different transfer media. [ 7 ] The former is doped with conductive metal nanomaterials (e.g., Ag nanoparticles, [ 8 ] and Ag nanowires [ 9 ] ), conductive carbon or carbide/nitride nanomaterials (e.g., conductive carbon black, [ 10 ] carbon nanotubes, [ 11 ] reduced graphene oxide, [ 12 ] graphite, [ 13 ] and Mxene [ 14 ] ) or conductive polymers (e.g., polyaniline, [ 15 ] and polypyrrole [ 16 ] ) in flexible insulating polymers such as polyvinyl alcohol, polyacrylic acid or polyacrylamide. Because they transmit electrical signals through electrons and holes, their electrical behavior is profoundly affected by the conductive percolation network.…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Ionic Skin with Sensing, UV‐Filtering, Water‐Retaining, and Anti‐Freezing Capabilities

Wen

Tang

et al. 2021

Adv Funct Materials

246

171

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Conductive polymer hydrogels are receiving considerable attention in applications such as soft robots and human-machine interfaces. Herein, a transparent and highly ionically conductive hydrogel that integrates sensing, UV-filtering, water-retaining, and anti-freezing performances is achieved by the organic combination of tannic acid-coated hydroxyapatite nanowires (TA@HAP NWs), polyvinyl alcohol (PVA) chains, ethylene glycol (EG), and metal ions. The highly ionic conductivity of the hydrogel enables tensile strain, pressure, and temperature sensing capabilities. In particular, in terms of the hydrogel strain sensors based on ionic conduction, it has high sensitivity (GF = 2.84) within a wide strain range (350%), high linearity (R 2 = 0.99003), fast response (≈50 ms) and excellent cycle stability. In addition, the incorporated TA@HAP NWs act as a nano-reinforced filler to improve the mechanical properties and confer a UV-shielding ability upon the hydrogel due to its size effect and the characteristics of absorbing ultraviolet light waves, which can reflect and absorb short ultraviolet rays and transmit visible light. Meanwhile, owing to the water-locking effect between EG and water molecules, the hydrogel exhibits freezing resistance at low temperatures and moisture retention at high temperatures. This biocompatible and multifunctional conductive hydrogel provides new ideas for the design of novel ionic skin devices.

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“…Moreover, the intensity of the diffraction peak presented lower values when combining PEG-40S and phospholipid into the sodium alginate matrix. Studies conducted by researchers have reported strong interactions between sodium alginate and the reinforcement polymer material, especially complexation caused by Ca 2+ crosslinking [36,41,42,43]. Thus, the XRD patterns provide evidence of the impregnation of PEG-40S and phospholipid into the sodium alginate matrix.…”

Section: Resultsmentioning

confidence: 98%

T-Shaped Microfluidic Junction Processing of Porous Alginate-Based Films and Their Characteristics

2019

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In this work, highly monodisperse porous alginate films from bubble bursting were formed on a glass substrate at ambient temperature, by a T-shaped microfluidic junction device method using polyethylene glycol (PEG) stearate and phospholipid as precursors in some cases. Various polymer solution concentrations and feeding liquid flow rates were applied for the generation of monodisperse microbubbles, followed by the conversion of the bubbles to porous film structures on glass substrates. In order to compare the physical properties of polymeric solutions, the effects of alginate, PEG stearate (surfactant), and phospholipid concentrations on the flowability of the liquid in a T-shaped microfluidic junction device were studied. To tailor microbubble diameter and size distribution, a method for controlling the thinning process of the bubbles’ shell was also explored. In order to control pore size, shape, and surface as well as internal structure morphologies in the scalable forming of alginate polymeric films, the effect of the feeding liquid’s flow rate and concentrations of PEG-stearate and phospholipid was also studied. Digital microscopy images revealed that the as-formed alginate films at the flow rate of 100 µL·min−1 and the N2 gas pressure of 0.8 bar have highly monodisperse microbubbles with a polydispersity index (PDI) of approximately 6.5%. SEM captures also revealed that the as-formed alginate films with high PDI value have similar monodisperse porous surface and internal structure morphologies, with the exception that the as-formed alginate films with the help of phospholipids were mainly formed under our experimental environment. From the Fourier-transform infrared spectroscopy (FTIR), Differential scanning calorimetry (DSC) and X-ray diffraction (XRD) measurements, we concluded that no chemical composition changes, thermal influence, and crystal structural modifications were observed due to the T-shaped microfluidic junction device technique. The method used in this work could expand and enhance the use of alginate porous films in a wide range of bioengineering applications, especially in tissue engineering and drug delivery, such as studying release behaviors to different internal and surface morphologies.

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Facile preparation and characterization of sodium alginate/graphite conductive composite hydrogel

Cited by 13 publications

References 33 publications

Composition dependent properties of graphene (oxide)‐alginate biopolymer nanocomposites

Composition dependent properties of graphene (oxide)‐alginate biopolymer nanocomposites

Multifunctional Ionic Skin with Sensing, UV‐Filtering, Water‐Retaining, and Anti‐Freezing Capabilities

T-Shaped Microfluidic Junction Processing of Porous Alginate-Based Films and Their Characteristics

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