The use of cellulose fiber from office waste paper to improve the thermal insulation-related property of konjac glucomannan/starch aerogel

Wu, Kao; Wu, Huaxin; Wang, Ru; Yan, Xu; Sun, Weiwei; Yi, Liu; Kuang, Ying; Jiang, Fatang; Chen, Sheng

doi:10.1016/j.indcrop.2021.114424

Cited by 33 publications

(10 citation statements)

References 45 publications

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“…However, other authors report a variability of the thermal conductivity of materials; for example, humidity is an essential factor, and its increase is directly proportional to the thermal conductivity. Yapin Zhou et al, reported results between 0.03-0.1 (W/mK), while other authors have reported results for lignocellulosic materials of 0.033 and 0.065 and 0.07 and 0.08 (W/mK) at different densities, achieving in some cases values over 400 (kg/m 3 ) [1,16,20,21,26,57]. It is important to note that the research mentioned above generates materials in a rigid or panel format, unlike the proposal, which uses a much less commonly used method: the blowing method.…”

Section: Discussionmentioning

confidence: 97%

“…Many studies have shown that cellulose paper and wheat straw have good thermal insulation properties. Wheat straw has thermal conductivity values between 0.036-0.05 (W/mK), while cellulose paper has thermal conductivity values between 0.038-0.068 (W/mK); in both cases, density is a relevant factor in this variability [7,[19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of a Thermal Insulating Material Based on a Wheat Straw and Recycled Paper Cellulose to Be Applied in Buildings by Blowing Method

2022

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The thermal envelope is a key component of a building’s energy efficiency. Therefore, considerable efforts have been made to develop thermal insulating materials with a better performance than the existing products. However, in the current climate change scenario, these materials must be sustainable, principally during their production stage. In this context, the use of recycled raw materials and agro-industrial waste can be the basis of a material with a low environmental impact and a good thermal performance. In this study, cellulose and wheat straw were characterized. Then, they were mixed in different proportions and densities and the best thermal behavior was selected. The materials were chemically analyzed by TAPPI 2007, thermogravimetric and infrared spectroscopy, together with the measurement of their thermal conductivity with a thermal property analyzer based on the transient line heat source method. The results show that both raw materials are chemically similar to each other. When mixed, they have a thermal conductivity ranging from 0.031 to 0.036 (W/mK), being comparable with several conventional thermal insulators. On the other hand, to achieve the commercial use of this material, an installation through a blowing process has been proposed and proves to be highly promising, achieving a proper density and efficiency in its application.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Characterization of a Thermal Insulating Material Based on a Wheat Straw and Recycled Paper Cellulose to Be Applied in Buildings by Blowing Method

2022

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“…Another advantage of foam forming is that enables the possibility to use different recyclable or renewable materials as natural fibers, nanoparticles, nanocellulose, flexible long fibers, recycled papers, peat, hemp waste, waste from brewers, etc. [ 41 , 42 , 43 , 44 ]. In the Table 2 are summarized the main advantages of foam forming technology compared with water forming process used to obtain conventional paper products.…”

Section: Foam Forming Of Cellulose Based Materialsmentioning

confidence: 99%

Overview on Foam Forming Cellulose Materials for Cushioning Packaging Applications

Nechita

Năstac

2022

Polymers

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Wet foam can be used as a carrier in the manufacturing of lightweight materials based on natural and man-made fibers and specific additives. Using a foam forming method and cellulose fibers, it is possible to produce the porous materials with large area of end-using such as protective and cushioning packaging, filtering, hydroponic, thermal and sound absorption insulation, or other building materials. In comparison with the water-forming used for conventional paper products, foam-forming method provides many advantages. In particular, since fibers inside the foam are mostly trapped between the foam bubbles, the formed materials have an excellent homogeneity. This allows for using long fibers and a high consistency in head box without significant fiber flocking. As result, important savings in water and energy consumptions for dewatering and drying of the foam formed materials are obtained. In cushioning packaging, foam-formed cellulose materials have their specific advantages comparing to other biodegradable packaging (corrugated board, molded pulp) and can be a sustainable alternative to existing synthetic foams (i.e., expanded polystyrene or polyurethane foams). This review discusses the technical parameters to be controlled during foam forming of cellulose materials to ensure their performances as cushioning and protective packaging. The focus was on the identification of practical solutions to compensate the strength decreasing caused by reduced density and low resistance to water of foam formed cellulose materials.

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“…Kognac glucomannan aerogel preparation KG aerogels were prepared according to the previously reported method with slight modifications (Wu et al, 2022). The KG hydrogels (prepared according to the aforementioned description) were cut into square cubes (1.5 × 1.5 × 1.5 cm 3 ) and placed in a freezer (−18 °C) for 24 h. The frozen cube-shaped gels were dried in a freeze-dryer (Sublimator 3 × 4 × 5 Zirbus technology, Bad Grund, Germany) for 48 h by reducing the pressure from 0.20 to 0.01 mbar and increasing the plate temperature from 20 to 35 °C The obtained aerogels were stored in sealed containers at room temperature until further analysis.…”

Section: Kognac Glucomannan Hydrogel Preparationmentioning

confidence: 99%

Characterisation of hydrogels and aerogels as carriers for sea buckthorn pomace extract

Švermickaitė

Eisinaitė

Vinauskienė

et al. 2022

Int J of Food Sci Tech

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Summary In this study, aerogels were prepared from kognac glucomannan (KG) or whey proteins loaded with bioactive sea buckthorn pomace extract. KG was diacetylated with Na2CO3 (0.1; 0.2; 0.3; 0.4 m) resulting hydrogel formation that were further freeze‐dried to obtain an aerogel structure. Whey protein aerogels were prepared by removing pore fluid from alcogels using supercritical CO2 drying. Produced aerogels evaluated for microstructure, porosity, specific surface area, absorption capacity, encapsulation efficiency and antioxidant capacity of the extract. It was found that higher concentration of alkali induced higher hardness, resilience and elastic modulus values. It was also obtained that pores in the konjac glucomannan aerogels were irregular in shape and a decrease in total pore volume (0.026 to 0.019 cc/g) and surface area (12.39 to 11.40 m2/g) after increasing the carbonate concentration was observed. These aerogels were found to have better encapsulation efficiency properties for sea buckthorn pomace extract (17 to 20%) in comparison to whey protein aerogels (0.05 to 0.36%). Overall, the KG aerogels show potential for applications in the food industry as a carrier of bioactive sea buckthorn pomace extract, while whey proteins must be used in combination with other biopolymers to enhance their bioactive compound loading capacity.

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The use of cellulose fiber from office waste paper to improve the thermal insulation-related property of konjac glucomannan/starch aerogel

Cited by 33 publications

References 45 publications

Characterization of a Thermal Insulating Material Based on a Wheat Straw and Recycled Paper Cellulose to Be Applied in Buildings by Blowing Method

Characterization of a Thermal Insulating Material Based on a Wheat Straw and Recycled Paper Cellulose to Be Applied in Buildings by Blowing Method

Overview on Foam Forming Cellulose Materials for Cushioning Packaging Applications

Characterisation of hydrogels and aerogels as carriers for sea buckthorn pomace extract

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