Green fabrication of flexible aerogels from polypropylene fibers for heat insulation and oil/water separation

N., Nga H.; Nguyen, Thien H.; Pham, Bong T.; Nguyen, Phuc; Nguyen, Son Truong; Duong, Hai M.; Le, Phung Thi Kim

doi:10.1007/s10934-020-01022-8

Cited by 18 publications

(8 citation statements)

References 29 publications

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“…The oil absorbency of our best developed AA (9.7 g/g) is comparable to commercial products such as polypropylene mat and nonwoven polypropylene where the oil absorption capacity is reported to be approximately 14.7 and 8.9 g/g, respectively [ 49 ]. In contrast to other aerogels developed, the oil absorption of the AAs developed was found to be better than PP/xylene aerogels (~5.0 g/g) [ 50 ] and comparable to Polyacrylonitrile-fiber-reinforced silica aerogels (9.6 g/g) [ 51 ]. This is evident in Figure 9 c. Although the oil absorption capacity is inferior compared to wool-based aerogels (136.2 g/g) [ 47 ], waste rubber fiber aerogel (25 g/g) [ 49 ], and cellulose aerogels from paper waste (95.0 g/g) [ 52 ], an argument can be made that these aerogels can achieve such high absorption due to the extremely low density of the fibers used, as opposed to the aluminum used in this study.…”

Section: Resultsmentioning

confidence: 99%

Advanced Fabrication and Multi-Properties of Aluminum-Based Aerogels from Aluminum Waste for Thermal Insulation and Oil Absorption Applications

et al. 2023

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Metal-based aerogels have attracted numerous studies due to their unique physical, structural, thermal, and chemical properties. Utilizing aluminum waste, a novel, facile, environmentally friendly approach to aluminum-based aerogels is proposed. In this work, the aluminum-based aerogels produced do not use toxic chemicals unlike conventional aerogel production. Aluminum powder, with poly(acrylic acid) and carboxymethyl cellulose as binders, is converted into aluminum-based aerogels using the freeze-drying method. The aluminum-based aerogels have low density (0.08–0.12 g/cm3) and high porosity (93.83–95.68%). The thermal conductivity of the aerogels obtained is very low (0.038–0.045 W/m·K), comparable to other types of aerogels and commercial heat insulation materials. Additionally, the aerogels can withstand temperatures up to 1000 °C with less than 40% decomposition. The aerogels exhibited promising oil absorption properties with their absorption capacity of 9.8 g/g and 0.784 g/cm3. The Young’s modulus of the aerogels ranged from 70.6 kPa to 330.2 kPa. This study suggests that aluminum-based aerogels have potential in thermal insulation and oil absorption applications.

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Section: Resultsmentioning

confidence: 99%

Advanced Fabrication and Multi-Properties of Aluminum-Based Aerogels from Aluminum Waste for Thermal Insulation and Oil Absorption Applications

et al. 2023

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“…There are two main reasons why HANAs had such excellent oil absorption performance: (i) the hydrophobic surface property of the HANA nanofiber network after CVD treatment, which has greatly improved the selectivity for oil; (ii) their high porosity could provide adequate space to store the absorbed liquids. It is worth noting that the absorption capacity of HANAs was comparable or superior to that of many reported 3D porous absorbents (Table S1), including CNF-PDMS aerogels (24−48 g/g), 66 silylated wood sponge (16−41 g/g), 15 PFS@HMDS (15−40 g/g), 14 cellulose aerogel (40−43 g/g), 73 agar/PVA aerogel (19−48 g/g), 74 polypropylene fibers aerogels (24−28 g/g), 75 and sugarcane bagasse aerogels (25 g/g). 76 Although the absorption capacity is still distinctly below that of some aerogel-based absorbents derived from polyimide nanofiber/MXene (56−136 g/g), 77 CNCs/ PVA/TEOS (69−168 g/g), 78 CS (31−63 g/g), 44 and ceramic nanofibers (33−76 g/g), 79 the HANAs could be easily prepared without any toxic reagents or complicated synthetic procedures that might hinder their practical applications.…”

Section: T H Imentioning

confidence: 99%

“…The thermal conductivity of HANAs is similar to other aerogel materials (Table S1). 73,75,76,79 To further demonstrate the thermal insulating properties of HANAs, HANA blocks from different concentrations of AG were tested under hot and cold conditions. First, HANA blocks with a thickness of approximately 2 mm were placed on a hot plate.…”

Section: T H Imentioning

confidence: 99%

Elastic Agarose Nanowire Aerogels for Oil–Water Separation and Thermal Insulation

Yang

Jiang

Xiao

et al. 2022

ACS Appl. Nano Mater.

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Problems resulting from the emission of crude oil, toxic organic solvents, and petroleum products, as well as massive heat dissipation from industrial pipes, have threatened ecosystems, human health, and industrial production. Eco-friendly and biodegradable natural materials are considered as the most promising absorbents or thermal insulation materials for oil−water separation and thermal insulation. In this work, agarose nanowire aerogels (ANAs) prepared from agarose (AG) solution were synthesized without any chemical reaction or chemical crosslinking agents to form AG hydrogels followed by supercritical CO 2 (SC-CO 2 ) drying. Then, hydrophobic agarose nanowire aerogels (HANAs) were obtained through a simple chemical vapor deposition (CVD) approach using methyltrimethoxysilane and methyltrichlorosilane. The gel skeleton of the HANAs after CVD was isometrically covered by a rigid silica coating with methyl on the ANA surface to improve flexibility, resulting in not only excellent self-cleaning and hydrophobicity with a water contact angle of 142°but also outstanding elasticity. Furthermore, the as-synthesized HANAs exhibited low density (≤0.09 g/cm 3 ), a large specific surface area (≥210.5 m 2 /g), and high porosity (94.9−98.7%). Hence, the HANAs displayed high absorption capacities (approximately 48.2 g/g of chloroform absorption capacity) and selectivity of oils and organic solvents. In addition, they also exhibited excellent thermal insulation performance under both hot and cold conditions. The designed HANAs are expected to provide a highly efficient method for oil−water separation and thermal insulation.

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“…In more recent advances in aerogel production, freeze drying has been employed to dry the gels through sublimation. [31][32][33][34][35][36][37][38][39][40][41][42][43] As the gels are first frozen to a solid state and sublimated into a gaseous state, it bypasses the capillary forces in the drying process whilst maintaining the aerogel structure. With this drying method, no solvent exchange is required and production can be up to 2.5 times faster.…”

Section: Introductionmentioning

confidence: 99%

Scale‐up fabrication and advanced properties of recycled polyethylene terephthalate aerogels from plastic waste

Goh,

Deng,

Teo

et al. 2024

Polymer Engineering & Sci

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Traditional fabrication methods of aerogels are time consuming, toxic, and difficult to implement, making the production of aerogels expensive and severely limits widespread adoption. Nonwoven technology is introduced to prepare fibers that can be used to create polymer‐based aerogel. With its introduction, it allows the continuous flow of fine fibers and eliminates the bottlenecking fiber preparation phase of the fabrication process. Using recycled polyethylene terephthalate (rPET) fibers and polyvinyl alcohol, two types of rPET aerogels are successfully fabricated, namely the lab‐scale and the large‐scale aerogels, to investigate the effectiveness of the nonwoven process line for the fiber preparation processing step. Fibers prepared manually (lab‐scale aerogels) and with the aid of a fiber preparation production line (large‐scale aerogels) are characterized and compared. Both lab‐scale and large‐scale aerogels exhibited the required specifications of low densities (12.6–45.9 and 13.2–43.7 mg/cm3, respectively) and high porosity (99.1%–96.7% and 99.0%–96.8%, respectively). Their thermal conductivity (23.4–34.0 and 23.2–31.9 mW/m⋅K, respectively) and compressive modulus (4.74–21.91 and 4.53–22.29 kPa, respectively) were also relatively similar. The advantage of scaled preparation of fibers for aerogel manufacturing includes higher throughputs (the line can produce up to 60 kg/h), improved consistency for defibrillation, homogenous fiber blending, and accurate replication of laboratory‐made aerogel properties. This demonstrates the viability of using nonwoven technology to scale for continuous production to bring down the production cost.Highlights Scale up production of aerogels using nonwoven technology Improving preparation process of aerogels through homogenous fiber blending Preparation rate of up to 60 kg/h Developed high porosity aerogels up to 99% Good thermal insulation of 23.2–31.9 mW/m⋅K

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Green fabrication of flexible aerogels from polypropylene fibers for heat insulation and oil/water separation

Cited by 18 publications

References 29 publications

Advanced Fabrication and Multi-Properties of Aluminum-Based Aerogels from Aluminum Waste for Thermal Insulation and Oil Absorption Applications

Advanced Fabrication and Multi-Properties of Aluminum-Based Aerogels from Aluminum Waste for Thermal Insulation and Oil Absorption Applications

Elastic Agarose Nanowire Aerogels for Oil–Water Separation and Thermal Insulation

Scale‐up fabrication and advanced properties of recycled polyethylene terephthalate aerogels from plastic waste

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