Study on the Preparation and Adsorption Property of Polyvinyl alcohol/Cellulose Nanocrystal/Graphene Composite Aerogels (PCGAs)

Wu, Yan; Wu, Xinyu; Yang, Feng; Xu, Li; Sun, Meng

doi:10.32604/jrm.2019.07493

Cited by 16 publications

(7 citation statements)

References 29 publications

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“…This was because during the pyrolysis process of aerogels, the hydrogen bonds of the molecular chains were recombined after breaking down, thus forming a more regular network structure again. Therefore, more heat was needed to decompose these structures [32,33].…”

Section: Structural Differences Of Aerogels Prepared By Different Solsmentioning

confidence: 99%

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Preparation of Nanocellulose Aerogel from the Poplar (Populus tomentosa) Catkin Fiber

Sun

et al. 2019

Forests

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The effects of chemical pretreatment on the purification of poplar (Populus tomentosa) catkin fiber and the effect of ultrasonic time for the microfibrillarization of poplar catkin fiber (PCF) were studied. The nanocellulose aerogels were prepared by freeze drying the cellulose solutions. The density, porosity, micro morphology, thermal stability and mechanical properties of the aerogels were analyzed. It was found that the dewaxing time of PCF is shorter than that of unsonicated nanocellulose. After the treatment of 0.5 wt% sodium chlorite for 2 h, the lignin of PCF was removed. After the chemical purification, the PCF was treated with 2 and 5 wt% NaOH solution and ultrasonicated for 5 and 10 min, respectively. When the ultrasonic time was 10 min, the diameter of the nanocellulose was 20-25 nm. When the ultrasonic time was 5 min, the aerogels with porous honeycomb structure can be prepared by using the nanocellulose sol of PCF as raw material. The density of the aerogels was only 0.3-0.4 mg/cm 3 and the porosities of the aerogels were all larger than 99%. The difference between the pyrolysis temperature of aerogels was small, the elastic modulus of aerogels was 30-52 kPa, and the compressive strength was 22-27 kPa. With the increase of the concentration of NaOH solution (5 wt%) and ultrasonic time (10 min), the elastic modulus of aerogels increased gradually and reached the maximum value of 52 kPa, while the compressive strength reached the maximum value of 27 kPa when the PCF being treated in 5 wt% NaOH solution and was ultrasonicated for 5 min. microstructure and chemical composition of the PCF make a large difference to its properties [1]. Thus studying the structure and chemical composition of PCF may play a vital role in the use of PCF in high value-added fields such as cellulose.Cellulose exists in the cell wall of plants in the form of microfibrils with a diameter of 3-5 nm. Microfibrils can aggregate to form cellulose aggregates with a diameter of several tens of nanometers and a length of several tens of micrometers, which is called cellulose nanofibers (CNFs). Compared to the microfibrillated cellulose and nanocellulose whiskers, its unique supramolecular structure and morphology make it possess excellent mechanical, optical and small molecular physical barrier properties [3]. It has broad application prospects in new biomaterials, medicine, information and other industrial fields [4]. At present, the source of nanocellulose is mainly from wood, but due to the long growth cycle and wide use of wood, it is urgent to find more suitable raw materials for high value-added nanocellulose. The scholars of related field have done a lot of researches to prepare the nanocellulose by using the cheap raw materials such as bamboo [5,6], tobacco stalk [7], cotton pulp [8-10], sisal fibers [11], crop straw [12,13], peanut shell [14], soybean hulls [15], banana peel and rod [16], coconut shell [17], cactus peel [18] and beet root [19].CNF aerogel (CNFA) is a natural polymer aerogel material. It not only has the advant...

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Section: Structural Differences Of Aerogels Prepared By Different Solsmentioning

confidence: 99%

“…Forests 2019, 10, 749 12 of 16 recombined after breaking down, thus forming a more regular network structure again. Therefore, more heat was needed to decompose these structures [32,33]. Figure 10 shows the stress-strain curves of aerogels prepared under four different conditions.…”

Section: Differences In Thermal Stability Of Aerogels Prepared By Difmentioning

confidence: 99%

Preparation of Nanocellulose Aerogel from the Poplar (Populus tomentosa) Catkin Fiber

Sun

et al. 2019

Forests

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“…Herein, we demonstrated an approach to disperse multilayer graphene (MLG) in water with the cellulose nanocrystal (CNC) as adjuvant ( Wu et al, 2019b ). Cellulose, one of the most abundant, natural, and renewable biopolymers in the world, is widely present in biomasses like woods ( Wu et al, 2019c , 2020a , b ), corn stover ( Zhao et al, 2020 ), and tunicate ( Zhao et al, 2015 ), and can be metabolized by specific bacteria.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, the features of inherent renewability, biodegradability, and biocompatibility make it an eco-friendly green material. In general, extraction from natural fibers through sulfuric acid hydrolysis is usually used to prepare CNC ( Wu et al, 2019b ). The negative charged sulfate groups in the CNC surface prepared by this method make them repel each other and result in good stability ( Jiang and Hsieh, 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Using Cellulose Nanocrystal as Adjuvant to Improve the Dispersion Ability of Multilayer Graphene in Aqueous Suspension

Zhang

Yang

et al. 2021

Front. Bioeng. Biotechnol.

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Cellulose nanocrystal (CNC) has been applied in various fields due to its nano-structure, high aspect ratio, specific surface area and modulus, and abundance of hydroxy groups. In this work, CNC suspensions with different concentrations (0.4, 0.6, and 0.8%) were used as the adjuvant to improve the dispersion ability of multilayer graphene (MLG) in aqueous suspension, which is easy to be aggregated by van der Waals force between layers. In addition, N-methyl-2-pyrrolidone, ethanol, and ultrapure water were used as control groups. Zeta potential analysis and Fourier transform infrared spectroscopy showed that the stability of MLG/CNC has met the requirement, and the combination of CNC and MLG was stable in aqueous suspension. Results from transmission electron microscopy, Fourier transform infrared spectroscopy, and absorbance showed that MLG had a better dispersion performance in CNC suspensions, compared to the other solutions. Raman spectrum analysis showed that the mixtures of 1.0 wt% MLG with 0.4% CNC had the least defects and fewer layers of MLG. In addition, it is found that CNC suspension with 0.8% concentration showed the highest ability to disperse 1.0 wt% MLG with the most stable performance in suspension. Overall, this work proved the potential application of CNC as adjuvant in the field of graphene nanomaterials.

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“…The high thermal conductivity of graphene suggests that it can be applied to microelectronics and thermal management. Since Balandin (2011) discovered that graphene exhibited remarkably better thermal conductivity than conventional carbon nanotubes, graphene has been applied to heat management of high-power electronics, including thermal dissipation systems for chips and batteries in smartphones, tablets, smart VR systems, and wearable devices (Wu et al, 2019;Zheng et al, 2019;Yang et al, 2020). Many studies have shown that polymer composite thermal conduction capabilities can be improved significantly via the blending or grafting of graphene (Yu et al, 2007;Ji et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Preparation of Graphene-Like Porous Carbons With Enhanced Thermal Conductivities From Lignin Nano-particles by Combining Hydrothermal Carbonization and Pyrolysis

Dong

Jin

et al. 2020

Front. Energy Res.

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Lignin nano-particles (LNPs) exhibit properties that distinguish them from the production of other lignin-based materials. However, little research has been performed to investigate whether porous carbons produced from LNPs exhibit a performance superior to those derived from untreated lignin. In this study, lignin was fabricated into LNPs and used to prepare high-performance porous carbons with enhanced thermal conductivities compared to that of carbons from neat lignin. Two different preparation protocols were employed: direct pyrolysis and hydrothermal carbonization followed by pyrolysis. Carbons obtained from 100 to 300 nm LNPs possessed more graphene-like structures than carbons from unaltered lignin. In addition, carbons prepared using a combination of hydrothermal carbonization and pyrolysis exhibited higher specific surface areas (108.81-220.75 m 2 /g) and total pore volumes (0.098-0.166 cm 3 /g) than those prepared via direct pyrolysis. In addition, LNP-derived carbons exhibited superior thermal conductivities (0.45 W/mK) and thermal conductivity rates (0.51 • C/s). This work provides the useful finding that superior graphene-like porous carbons can be produced by transforming lignin into LNP and then hydrothermally carbonizing the resulting material prior to pyrolysis.

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Study on the Preparation and Adsorption Property of Polyvinyl alcohol/Cellulose Nanocrystal/Graphene Composite Aerogels (PCGAs)

Cited by 16 publications

References 29 publications

Preparation of Nanocellulose Aerogel from the Poplar (Populus tomentosa) Catkin Fiber

Preparation of Nanocellulose Aerogel from the Poplar (Populus tomentosa) Catkin Fiber

Using Cellulose Nanocrystal as Adjuvant to Improve the Dispersion Ability of Multilayer Graphene in Aqueous Suspension

Preparation of Graphene-Like Porous Carbons With Enhanced Thermal Conductivities From Lignin Nano-particles by Combining Hydrothermal Carbonization and Pyrolysis

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