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cellulose aerogel

Hosein Bidgoli, Yadollah Mortazavi, Abbas Ali Khodadadi
A new synthesis strategy was adopted to convert cellulose to a biodegradable sorbent with properties of very high oil absorption and retention capacities, excellent oil-water selectivity, good mechanical strength and recycling ability. The sorbent in form of a hydrophobic/oleophilic nano-structured aerogel was prepared through functionalizing cotton cellulose with low surface energy moieties followed by dissolving and chemically cross-linking the product in an organic medium (DMSO), and freeze-drying. High absorption capacities of 40...
November 23, 2018: Journal of Hazardous Materials
Hao-Yang Mi, Xin Jing, Zhiyong Cai, Yuejun Liu, Lih-Sheng Turng, Shaoqin Gong
Boosting power generation performance while employing economical and biocompatible materials is an ongoing direction in the field of triboelectric nanogenerators (TENGs). Here, highly porous, biocompatible, cellulose nanofibril (CNF) composite-based TENGs are developed through an environmentally friendly freeze-drying approach. High tribopositivity materials, including silica fiber, human hair, and rabbit fur, are used as fillers in composite TENG fabrication for the first time to enhance the triboelectric output performance...
December 5, 2018: Nanoscale
Mingjie Wang, Fu Liu, Yao Chen, Jianmin Gao
The biomorphic Silicon Carbide (BioSiC) ceramic with highly interconnected porous three-dimensional (3D) structure was fabricated by utilizing balsa wood cellulose nanofibers aerogel as the biotemplate and polycarbosilane (PCS) as the preceramic precursor. Evolution of morphology, composition, and pore properties from untreated wood to porous BioSiC was investigated systemically. The shrinkage and weight gain during pyrolysis was discussed. It was found that the structure of as-synthesized BioSiC was related to the microstructure of wood aerogel template and the concentration of PCS precursor...
November 30, 2018: Materials
Amir Sheikhi, Joel Hayashi, James Eichenbaum, Mark Gutin, Nicole Kuntjoro, Danial Khorsandi, Ali Khademhosseini
The recent decade has witnessed a growing demand to substitute synthetic materials with naturally-derived platforms for minimizing their undesirable footprints in biomedicine, environment, and ecosystems. Among the natural materials, cellulose, the most abundant biopolymer in the world with key properties, such as biocompatibility, biorenewability, and sustainability has drawn significant attention. The hierarchical structure of cellulose fibers, one of the main constituents of plant cell walls, has been nanoengineered and broken down to nanoscale building blocks, providing an infrastructure for nanomedicine...
November 27, 2018: Journal of Controlled Release: Official Journal of the Controlled Release Society
Jean Paulo de Oliveira, Graziella Pinheiro Bruni, Shanise Lisie Mello El Halal, Fabiano Cleber Bertoldi, Alvaro Renato Guerra Dias, Elessandra da Rosa Zavareze
This study describes the valorization of rice and oat husks by obtaining cellulose nanocrystals for the production of aerogels for food packaging applications. Commercial cellulose was used as a control sample. Nanocrystals from cellulose were obtained by enzymatic hydrolysis and mechanical treatment at high pressure. The morphology, particle size, functional groups, crystallinity, and thermal properties of the cellulose nanocrystals were analyzed. The morphology, functional groups, crystallinity, water absorption capability, and zeta potential of aerogels were also analyzed...
November 21, 2018: International Journal of Biological Macromolecules
Chao Lei, Junkuo Gao, Wenjing Ren, Yuanbo Xie, Somia Yassin Hussain Abdalkarim, Shunli Wang, Qingqing Ni, Juming Yao
In the present work, we develop novel method of loading metal-organic frameworks (UiO-66 and UiO-66-NH2 ) on the flexible cellulose aerogels as metal-organic frameworks@cellulose aerogels composite materials by using in situ growth procedure at room temperature. The as prepared metal-organic frameworks@cellulose aerogels composite materials were well characterized via SEM, XRD, atomic absorption spectrometer, and TG analysis, besides the adsorption of Pb2+ and Cu2+ in metal-organic frameworks@cellulose aerogels composite materials was investigated...
February 1, 2019: Carbohydrate Polymers
Beini Zeng, Xungai Wang, Nolene Byrne
Cellulose aerogels with orientated micron-sized pore structure were obtained from denim waste utilizing ionic liquid solvents through dissolution, regeneration and drying. The pore structure of denim-derived aerogels was comprised of a mixture of micron-sized vertically aligned pores and a nanoporous fibrous network. The size and distribution of vertically aligned pores and the nanopores were influenced by the choice of ionic liquid solvent, amount of denim used and drying method employed. A detailed study on the morphology of the cellulose aerogels produced from waste denim is provided...
February 1, 2019: Carbohydrate Polymers
Kathirvel Ganesan, Tatiana Budtova, Lorenz Ratke, Pavel Gurikov, Victor Baudron, Imke Preibisch, Philipp Niemeyer, Irina Smirnova, Barbara Milow
A detailed study of the production of polysaccharide aerogel (bio-aerogel) particles from lab to pilot scale is surveyed in this article. An introduction to various droplets techniques available in the market is given and compared with the lab scale production of droplets using pipettes and syringes. An overview of the mechanisms of gelation of polysaccharide solutions together with non-solvent induced phase separation option is then discussed in the view of making wet particles. The main steps of particle recovery and solvent exchange are briefly described in order to pass through the final drying process...
October 31, 2018: Materials
Hongyuan Zhang, Shangyun Lyu, Xiaomin Zhou, Hongbo Gu, Chao Ma, Chunhui Wang, Tao Ding, Qian Shao, Hu Liu, Zhanhu Guo
In this work, the concentration effect of both nanocellulose and sodium dodecylsulfate (SDS) on the fabrication of a super light 3D hierarchical framework adsorbent nanocellulose aerogel foam (NAF) is exploited through a high speed mechanical foaming and solvent-free method by adding SDS. The results show that the optimal concentration of nanocellulose and SDS for preparation of this 3D NAF/SDS is 0.4 and 0.2 wt%, accordingly. By utilizing unique gridding framework of NAF/SDS, a low density of 1.50 mg cm-3 and high adsorption capacity of 206...
February 15, 2019: Journal of Colloid and Interface Science
Chaoji Chen, Liangbing Hu
Cellulose is the most abundant biopolymer on Earth and has long been used as a sustainable building block of conventional paper. Note that nanocellulose accounts for nearly 40% of wood's weight and can be extracted using well-developed methods. Due to its appealing mechanical and electrochemical properties, including high specific modulus (∼100 GPa/(g/cm3 )), excellent stability in most solvents, and stability over a wide electrochemical window, nanocellulose has been widely used as a separator, electrolyte, binder, and substrate material for energy storage...
October 9, 2018: Accounts of Chemical Research
Hao Guan, Zhiyong Cheng, Xiaoqing Wang
Aerogels derived from nanocellulose have emerged as attractive absorbents for cleaning up oil spills and organic pollutants due to their lightweight, exceptional absorption capacity, and sustainability. However, the majority of the nanocellulose aerogels based on the bottom-up fabrication process still lack sufficient mechanical robustness because of their disordered architecture with randomly assembled cellulose nanofibrils, which is an obstacle to their practical application as oil absorbents. Herein, we report an effective strategy to create anisotropic cellulose-based wood sponges with a special spring-like lamellar structure directly from natural balsa wood...
October 3, 2018: ACS Nano
Sven F Plappert, Jean-Marie Nedelec, Harald Rennhofer, Helga C Lichtenegger, Sigrid Bernstorff, Falk W Liebner
Assembly of (bio)polymers into long-range anisotropic nanostructured gels and aerogels is of great interest in advanced material engineering since it enables directional tuning of properties, such as diffusivity, light, heat, and sound propagation, cell proliferation, and mechanical properties. Here we present an approach toward anisotropic cellulose II gels and aerogels that employs specific diffusion and phase separation phenomena occurring during decelerated infusion of an antisolvent into isotropic supercooled solutions of cellulose in an ionic liquid to effectuate supramolecular assembly of cellulose in anisotropic colloidal network structures...
October 15, 2018: Biomacromolecules
Hadi Hosseini, Mehrdad Kokabi, Seyyed Mohammad Mousavi
In this work, in-situ biosynthesized bacterial cellulose (BC) /multiwall carbon nanotubes (MWCNTs) nanocomposite hydrogels converted to the conductive nanocomposite aerogels via the supercritical CO2 method. A low percolation threshold value of 0.0041 (volume concentration) predicted for BC/MWCNTs nanocomposite aerogels by the proposed modified model. The piezoresistive behavior of the nanocomposite aerogel at percolation threshold, evaluated in tension mode. The strain sensing outcomes revealed a linear trend during loading until a critical strain, afterward began to decline with further increasing of strain...
December 1, 2018: Carbohydrate Polymers
Hui Zhang, Yuqi Li, Ronghui Shi, Lihui Chen, Mizi Fan
Marine pollution caused by frequent oil spill accidents has already produced catastrophic influence on marine ecological environments. Even though traditional superhydrophobic/superoleophilic surface-coated materials have demonstrated to be effective for oil/water separation, they still suffer from complicated fabrication procedures, mechanical damages and loss of their superoleophobicity in high-salinity environments. Herein, a robust salt-tolerant superoleophobic aerogel was introduced for highly efficient oil/seawater separation, which was fabricated by incorporating nanofibrillated cellulose (NFC) into chitosan (CS) matrix through freeze-drying method...
November 15, 2018: Carbohydrate Polymers
You Lv, Baolin Xing, Mingkun Zheng, Guiyun Yi, Guangxu Huang, Chuanxiang Zhang, Ruifu Yuan, Zhengfei Chen, Yijun Cao
A novel carboxymethyl cellulose (CMC)-supported graphene oxide aerogel (CGOA) was fabricated from a cost-effective and abundant bituminous coal by a mild hydrothermal process and freeze-drying treatment. Such an aerogel has cross-linked graphene oxide layers supported by CMC, and therefore, displays high mechanical strength while having ultra-low density (8.257 mg·cm-3 ). The CGOA has a 3D interconnected porous structure, beneficial graphene framework defects and abundant oxygen-containing functional groups, which offer favorable diffusion channels and effective adsorption sites for the transport and adsorption of dye molecules...
August 29, 2018: Nanomaterials
Miao Yu, Yingying Han, Yao Li, Jian Li, Lijuan Wang
In this work, biomass-derived three-dimensional carbon fiber aerogels loading polypyrrole particles were prepared by a facile and cost-effective two-step synthesis process. Firstly, carbon aerogels were prepared by pyrolysis of cellulose aerogels composed of cattail derived cellulose microfibers, then the polypyrrole anchored interconnected carbon fiber aerogels were prepared by in-situ oxidative polymerization. Binder-free supercapacitors based on the carbon aerogel/polypyrrole composites exhibit the largest areal capacitance of 419 mF cm-2 at a current density of 1 mA cm-2 with a potential range of 0...
November 1, 2018: Carbohydrate Polymers
Shan Ye, Shu He, Chen Su, Lei Jiang, Yanyi Wen, Zhongjie Zhu, Wei Shao
Cellulose has been widely used in the biomedical field. In this study, novel cellulose aerogels were firstly prepared in a NaOH-based solvent system by a facile casting method. Then amoxicillin was successfully loaded into cellulose aerogels with different loadings. The morphology and structure of the cellulose aerogels were characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The drug release and antibacterial activities were also evaluated. The drug release results showed that cellulose aerogels have controlled amoxicillin release performance...
August 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiao Wei, Ting Huang, Jun Nie, Jing-Hui Yang, Xiao-Dong Qi, Zuo-Wan Zhou, Yong Wang
As one of the materials from natural resources, the functionalization and application of cellulose attract increasing concerns. In this work, we reported a facile method to prepare the bio-inspired functionalization of microcrystalline cellulose (MCC) aerogel through polydopamine (PDA) coating, which was realized via the self-polymerization of dopamine in the MCC/LiBr solution followed by the freeze-drying technology. The morphological characterization showed that the pore morphologies of the compounded aerogel were influenced by the content of PDA...
October 15, 2018: Carbohydrate Polymers
Jian Zhou, You-Lo Hsieh
Strong and highly conductive aerogels have been assembled from cellulose nanofibrils (CNFs) protonated with conductive poly(3,4-ethylene dioxythiophene)/poly(styrene sulfonate) (PEDOT/PSS) complex at equal mass or less. Protonating CNF surface carboxylates and hydrogen-bonding CNF surface carboxyls with PSS in PEDOT/PSS generated PEDOT/PSS/CNF aerogels that were up to ten times stronger while as conductive as neat PEDOT/PSS aerogel, attributed to the transformation of PEDOT benzoid structure to the more electron transfer-preferred quinoid structure...
August 22, 2018: ACS Applied Materials & Interfaces
Fang Ren, Zhen Li, Wen-Zhen Tan, Xiao-Hui Liu, Zhen-Feng Sun, Peng-Gang Ren, Ding-Xiang Yan
Composite aerogels consisting of graphene oxide (GO) and regenerated cellulose (RCE) were prepared via a solution mixing-regeneration and freeze-drying process. The prepared RCE/GO composites aerogel exhibited 3D network thin-walled pore structure with large specific surface area, also favorable compression recovery capability, outstanding dye elimination efficiency and reusability after the addition of GO. With addition of only 0.5 wt% GO, the methylene blue (MB) elimination efficiency of RCE/GO aerogel reached 99...
December 15, 2018: Journal of Colloid and Interface Science
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