scholarly journals Nanofibrillated Cellulose-Based Aerogels Functionalized with Tajuva (Maclura tinctoria) Heartwood Extract

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 908
Author(s):  
Rodrigo Coldebella ◽  
Marina Gentil ◽  
Camila Berger ◽  
Henrique W. Dalla Costa ◽  
Cristiane Pedrazzi ◽  
...  
Keyword(s):  
Antioxidant Activities ◽  
Three Dimensional ◽  
Nanofibrillated Cellulose ◽  
High Specific Surface Area ◽  
Low Density ◽  
High Porosity ◽  
Porous Networks ◽  
Bonded Particles ◽  
Phenolic Extract ◽  
Cellulosic Pulp

Aerogels are 3-D nanostructures of non-fluid colloidal interconnected porous networks consisting of loosely packed bonded particles that are expanded throughout their volume by gas and exhibit ultra-low density and high specific surface area. Cellulose-based aerogels can be obtained from hydrogels through a drying process, replacing the solvent (water) with air and keeping the pristine three-dimensional arrangement. In this work, hybrid cellulose-based aerogels were produced and their potential for use as dressings was assessed. Nanofibrilated cellulose (NFC) hydrogels were produced by a co-grinding process in a stone micronizer using a kraft cellulosic pulp and a phenolic extract from Maclura tinctoria (Tajuva) heartwood. NFC-based aerogels were produced by freeze followed by lyophilization, in a way that the Tajuva extract acted as a functionalizing agent. The obtained aerogels showed high porosity (ranging from 97% to 99%) and low density (ranging from 0.025 to 0.040 g·cm−3), as well a typical network and sheet-like structure with 100 to 300 μm pores, which yielded compressive strengths ranging from 60 to 340 kPa. The reached antibacterial and antioxidant activities, percentage of inhibitions and water uptakes suggest that the aerogels can be used as fluid absorbers. Additionally, the immobilization of the Tajuva extract indicates the potential for dentistry applications.

scholarly journals Preparation and Characterization of Gaphene-Doped Carbon-Aerogel Electrode

2022 ◽  
Vol 2160 (1) ◽  
pp. 012003
Author(s):  
Zhengshun Wang ◽  
Kaizheng Wang ◽  
Jianzhen Mao ◽  
Zaiyong Jiang
Keyword(s):  
Electrode Materials ◽  
Three Dimensional ◽  
Carbon Aerogel ◽  
High Specific Surface Area ◽  
Carbon Aerogels ◽  
Porous Carbon Material ◽  
Low Density ◽  
High Porosity ◽  
Dimensional Network

Abstract Carbon-aerogel is a kind of nano-porous carbon material with special three-dimensional network structure. Electrode materials with high specific surface area, high porosity, superior conductivity and low density were obtained by adding graphene to prepare graphene-doped carbon-aerogels.

scholarly journals MFC/NFC-Based Foam/Aerogel for Production of Porous Materials: Preparation, Properties and Applications

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5568
Author(s):  
Chenni Qin ◽  
Mingzhu Yao ◽  
Yang Liu ◽  
Yujie Yang ◽  
Yifeng Zong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Porous Materials ◽  
Raw Materials ◽  
Sewage Treatment ◽  
Nanofibrillated Cellulose ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Retention Performance ◽  
Plant Fibers ◽  
Technical Problems

Nanofibrillated cellulose and microfibrillated cellulose are potential raw materials separated from plant fibers with a high aspect ratio and excellent mechanical properties, which can be applied in various fields (packaging, medicine, etc.). They have unique advantages in the preparation of aerogels and foams, and have attracted widespread attention in recent years. Cellulose-based porous materials have good biodegradability and biocompatibility, while high porosity and high specific surface area endow them with strong mechanical properties and liquid retention performance, which can be used in wall construction, sewage treatment and other fields. At present, the preparation method of this material has been widely reported, however, due to various process problems, the actual production has not been realized. In this paper, we summarize the existing technical problems and main solutions; in the meantime, two stable systems and several drying processes are described, and the application potential of cellulose-based porous materials in the future is described, which provides a reference for subsequent research.

Electro-Deposition for Foamed Zinc Material from Zinc Sulfate Solution

2007 ◽  
Vol 561-565 ◽  
pp. 1669-1672 ◽  
Author(s):  
Qing Hua Tian ◽  
Xue Yi Guo ◽  
Ping Xue ◽  
Yu Song ◽  
Lian Duan
Keyword(s):  
Ph Value ◽  
Three Dimensional ◽  
Sulfate Solution ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Outward Appearance ◽  
Experimental Conditions ◽  
Electro Deposition ◽  
Zinc Electrodeposition ◽  
Operation Conditions

It is very possible for the foam zinc materials to take the place of zinc powder and become a new ideal material of electrode for zinc-air battery, because of its excellent three dimensional reticulated structure, high porosity, high specific surface area and uniform quality, and was widely used in many other fields. A novel method for preparing very porous zinc foam was proposed, in which the polyurethane foam as substrate was processed by degreasing process, roughening process, activation, electroless plating and zinc electrodeposition. Then, experiments were carried out to explore the effects of the solution composition（concentration of ZnSO4）and the operation conditions （such as the interelectrode distance; current density, temperature, pH value of electroplating solution and so on) on the morphology of the foam zinc and the current efficiency. The optimum experimental conditions were determined by optimizing the factors. On these conditions the foam zinc presents a three-dimensional reticular structure with high porosity, and uniformity, and the outward appearance of the coating is bright.

scholarly journals Fabrication of Macroporous Biomorphic SiC from Cellulose Nanofibers Aerogel

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2430 ◽  
Author(s):  
Mingjie Wang ◽  
Fu Liu ◽  
Yao Chen ◽  
Jianmin Gao
Keyword(s):  
Cellulose Nanofibers ◽  
3D Structure ◽  
Three Dimensional ◽  
Untreated Wood ◽  
Low Density ◽  
High Porosity ◽  
Wood Cellulose ◽  
Infiltration Process ◽  
Balsa Wood ◽  
Pore Properties

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. The proper microstructure of cellulose skeleton which was essential for the infiltration process could obtained by removing lignin and hemicellulose appropriately. The optimum PCS content was 40 wt. % for easy infiltration and proper SiC content. The results revealed that the dredged skeleton of cellulose was reproduced perfectly by PCS ceramization. The obtained BioSiC presented high porosity (61.03%) and low density (0.86 g/cm3) with good Darcy permeability (19.22 mD).

scholarly journals Porous Aerogels and Adsorption of Pollutants from Water and Air: A Review

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4440
Author(s):  
Paola Franco ◽  
Stefano Cardea ◽  
Antonio Tabernero ◽  
Iolanda De Marco
Keyword(s):  
Organic Dyes ◽  
High Surface ◽  
High Surface Area ◽  
Three Dimensional ◽  
Low Density ◽  
High Porosity ◽  
Future Developments ◽  
Oxygenated Volatile Organic Compounds ◽  
Volatile Organic ◽  
Harmful Substances

Aerogels are open, three-dimensional, porous materials characterized by outstanding properties, such as low density, high porosity, and high surface area. They have been used in various fields as adsorbents, catalysts, materials for thermal insulation, or matrices for drug delivery. Aerogels have been successfully used for environmental applications to eliminate toxic and harmful substances—such as metal ions or organic dyes—contained in wastewater, and pollutants—including aromatic or oxygenated volatile organic compounds (VOCs)—contained in the air. This updated review on the use of different aerogels—for instance, graphene oxide-, cellulose-, chitosan-, and silica-based aerogels—provides information on their various applications in removing pollutants, the results obtained, and potential future developments.

scholarly journals A three-dimensional porous MoS2–PVP aerogel as a highly efficient and recyclable sorbent for oils and organic solvents

2020 ◽  
Vol 1 (4) ◽  
pp. 760-766 ◽  
Author(s):  
Pin Song ◽  
Jun Di ◽  
Haiping Chen ◽  
Sirui Zhao ◽  
Cao Wu ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Three Dimensional ◽  
Low Density ◽  
High Porosity ◽  
Large Specific Surface Area ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water

Three-dimensional (3D) aerogels have attracted more and more attention in oil–water separation, due to their advantages of low density, high porosity, and large specific surface area.

scholarly journals Sodium silicate-derived aerogels: effect of processing parameters on their applications

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15301-15322
Author(s):  
Minju N. ◽  
Balagopal N. Nair ◽  
Savithri S.
Keyword(s):  
Three Dimensional ◽  
Optical Transmittance ◽  
Processing Parameters ◽  
Silica Aerogels ◽  
High Specific Surface Area ◽  
High Porosity ◽  
Open Networks ◽  
Preparation Conditions ◽  
High Optical Transmittance ◽  
Low Refractive Index

Inorganic silica aerogels are large three-dimensional open networks with properties such as low density, high porosity, low thermal conductivity, high specific surface area, low refractive index, and high optical transmittance depending on their preparation conditions.

Preparation and characterization of electrospun cellulose acetate sub-micro fibrous membranes

2021 ◽  
pp. 004051752110117
Author(s):  
Zhenzhen Quan ◽  
Yihan Wang ◽  
Jiajun Wu ◽  
Xiaohong Qin ◽  
Jianyong Yu
Keyword(s):  
Cellulose Acetate ◽  
High Specific Surface Area ◽  
Proper Solution ◽  
High Porosity ◽  
Hydrolysis Time ◽  
Research Fields ◽  
Average Porosity ◽  
Fibrous Membranes ◽  
Microfiber Membrane ◽  
Solution Parameters

Electrospun sub-microfiber membrane of cellulose acetate (CA), with excellent biodegradability, high specific surface area and high porosity, has attracted wide attention in various research fields. Even so, the stable continuous electrospinning of CA sub-micro fibers is affected by the solution parameters and CA acetylation degree dramatically, which still remains challenging. In the present work, electrospun CA sub-micro fibrous membranes have been prepared from four distinct solvent systems, respectively, to explore the proper solution parameters for membrane fabrication. After hydrolysis and electrospinning, the produced CA sub-micro fibrous membranes were analyzed in terms of fiber size distribution, hydrophilicity and porosity. Current analysis has shown that the degree of substitution of CA sub-micro fibers decreases with the increase in hydrolysis time, resulting in increased diameter irregularity, decreased average porosity and increased hydrophilicity of the sub-micro fibrous membrane.

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