Dispersing Graphene in Hydroxypropyl Cellulose by Utilizing its LCST Behavior

Liao, Ruijuan; Lei, Yanda; Wan, Jingjing; Tang, Zhenghai; Guo, Baochun; Zhang, Liqun

doi:10.1002/macp.201200137

Cited by 17 publications

(8 citation statements)

References 50 publications

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“…[ 96,97 ] CNFs/RGO@PPy‐2 microfibers exhibit the typical characteristic peaks of PPy as well as D and G bands of RGO, while the peaks of CNFs are unobvious; it is probably ascribed to that the conjugated structure turns to be more detectable for Raman signal. [ 98 ] The G bond of CNFs/RGO‐1.62 microfibers (1578 cm −1 ) has a blue shift compared to that of CNFs/RGO@PPy‐2 microfibers (1591 cm −1 ), which may be attributed to the π–π interaction and hydrogen bonds between aromatic PPy rings with CNFs and RGO, indicating that PPy has been successfully coated on hybrid microfibers. [ 99,100 ]…”

Section: Resultsmentioning

confidence: 99%

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Chen

2020

Macro Materials & Eng

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Thanks to their considerable electrochemical and mechanical properties, fiber‐shaped supercapacitors have become the most potential energy storage devices for portable and wearable electronics in the future; however, challenges still exist in the pursuit of practical applications among them. In this work, ternary microfibers, which are composed of TEMPO‐oxidized cellulose nanofibers/reduced graphene oxide microfiber cores coated with polypyrrole shell layers, are successfully fabricated through industrializable and sustainable wet‐spinning and interfacial polymerization strategies. The prepared microfibers possess well‐defined microstructures and outstanding mechanical properties (559 MPa). When assembled into symmetrical all‐solid‐state fiber‐shaped supercapacitors (FSCs), they exhibit remarkable electrochemical properties (647 mF cm−2, 14.37 µWh cm−2 at 0.1 mA cm−2), prominent cycling stability (92.5% capacitance retention and 92.6% coulomb efficiency after 10 000 cycles), and extraordinary flexibility (no significant decay in capacitance after 5000 bending cycles), which are superior to all the congeneric FSCs reported to date. The prominent performances are ascribed to the synergistic effect of the well‐designed ternary system and synergistic effects between interior components. The advantages in electrochemical, mechanical, and industrial properties of the ternary FSCs can provide reference and boost the development of flexible energy storage applications.

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Section: Resultsmentioning

confidence: 99%

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Chen

2020

Macro Materials & Eng

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“…It was found that cellulose nanofibrils led to higher strength and modulus than CNCs due to the larger aspect ratio and fiber entanglement for the same concentration (Xu et al 2013); the optimal filling content of cellulose nanofibrils was between 10 and 20 wt% for the highest modulus of elasticity due to the formation of a percolating network, but inhomogeneities and entanglement of cellulose nanofibrils on a larger scale would deteriorate and somewhat increase the standard deviation of the mechanical properties. In this work, HPC could enhance the dispersion of the CNCs in water solution as a surfactant (Adsul et al 2011;Liao et al 2012), and the perfect affinity between the HPC matrix and the CNCs reinforcement would overcome the interface defects, leading to good CNCs dispersion in the CNCs/HPC nanocomposite membranes even for high CNCs content. However, if the CNCs content exceeded 60 wt%, the brittleness of the membranes increased sharply and it became impossible to obtain a nanocomposite membrane using the mixing/evaporation method.…”

Section: Reinforcement Effect Of Cncs On the Mechanical Properties Ofmentioning

confidence: 97%

Cellulosic nanocomposite membranes from hydroxypropyl cellulose reinforced by cellulose nanocrystals

Wang

et al. 2014

Cellulose

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Cellulosic nanocomposite membranes were prepared by incorporation of cellulose nanocrystals (CNCs) into a hydroxypropyl cellulose (HPC) matrix using a mixing/evaporation technique. CNCs were obtained from filter paper using the sulfuric acid hydrolysis method with the aid of ultrasonication. The relationship between the microstructure and mechanical properties of the CNCs/HPC nanocomposite membranes was studied. Scanning electron microscopy showed that the CNCs were well dispersed in the HPC matrix, and the fracture surface demonstrated a fibrous characteristic. With increasing CNCs content, the tensile strength and Young's modulus of the CNCs/HPC nanocomposite membranes gradually increased. At 5 wt% content of CNCs, the strength was increased by 525 % and the Young's modulus by 124 % compared with pure HPC membrane. Moreover, the effect of the phase change of HPC on the mechanical properties of the CNCs 5wt% /HPC nanocomposite membranes and the corresponding mechanism were also studied.

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“…We also employed XPS to analyze the sample of graphene oxide ( Figure A). In brief, the C1s and O1s XPS spectra of GO (Figure 3B) clearly indicated a considerable degree of oxidation by the C=C peak at 284.3 eV and the C atom in the C–O bond at 286.1 eV 20, 21…”

Section: Resultsmentioning

confidence: 99%

Microstructure‐Controllable Graphene Oxide Hydrogel Film Based on a pH‐Responsive Graphene Oxide Hydrogel

Qin

Liu

Zhuo

et al. 2012

Macro Chemistry & Physics

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A graphene oxide hydrogel (GOH) is fabricated via suspending the graphene oxide (GO) in water without any additional processing steps. At the hydrogel/air interface, a well‐defined hydrogel membrane forms once the solvent is removed by vacuum drying. The microstructure of the resulting GOH film can be tailored by different dehydration approaches, as well as by varying the GO concentration in the hydrogel. This GOH exhibited pH‐responsiveness and good mechanical properties. Meanwhile, the GOH presented good adsorption capacity to the organic dye rhodamine B and anionic chromate Cr2O72−. This GOH may find great potential in many fields, such as wastewater treatment, biodetection, etc.

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Dispersing Graphene in Hydroxypropyl Cellulose by Utilizing its LCST Behavior

Cited by 17 publications

References 50 publications

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Core–Shell Structured Cellulose Nanofibers/Graphene@Polypyrrole Microfibers for All‐Solid‐State Wearable Supercapacitors with Enhanced Electrochemical Performance

Cellulosic nanocomposite membranes from hydroxypropyl cellulose reinforced by cellulose nanocrystals

Microstructure‐Controllable Graphene Oxide Hydrogel Film Based on a pH‐Responsive Graphene Oxide Hydrogel

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