As discussed above, recycled cellulose aerogel is promising for applying on building walls as an effective thermal insulation material. On the other hand, if the material is repellent to water, it can be applied onto the exterior sides of the walls to protect buildings from moisture attack. Therefore, a water repellent agent(ReviveX® Nubuck) or MTMS was applied on the surface of the recycled cellulose aerogel via a physical or chemical method. As shown in Fig. 6a, the surface of the aerogel is covered by the water repellent polymer and all the pores are fully covered. In contrast, the MTMS-functionalized sample still has a porous structure (Fig. 6b). Water contact angle measurements were performed for the original uncoated sample and the coated samples (Fig. 6c and d). For the uncoated sample, water is easily absorbed by the aerogel due to the
hydrophilic nature of cellulose. As can be seen in Fig. 6c and d, the physically coated sample has a water contact angle of 130.7◦, which is smaller than that of the chemically coated sample (135.2◦). This indicates that the MTMS coating is more water repellent than the coating with the commercial agent. The samples were then exposed in air and sunlight for several days and their water contact angles were measured during the exposure time (Fig. 6e). It can be seen that both of the two samples show little changes in water contact angle, indicating their excellent water repellent durability. When the material is coated with MTMS, it will become hydrophobic and oleophilic and therefore, has a good affinity to oil. The MTMS-coated recycled cellulose aerogel was used for the oil absorption test (Fig. 7). It shows strong affinities to both of the motor and cooking oils with high oil uptake contents of 18 and 17.6 g g−1, respectively. After being coated with MTMS, the material shows a thermal conductivity value of 0.029Wm−1K−1, which is lower than the thermal conductivity (0.032Wm−1K−1) of the uncoated sample, indicating an improvement of thermal insulation property due to the MTMS coating. As stated above, the total global aerogel market will grow at a very high rate of 19.3% from 2012 to 2017 with more than 80% of aerogels used for thermal and acoustic insulation. Therefore, with high thermal insulation property, our recycled cellulose aerogel is extremely promising for the industrial insulation market.
As discussed above, recycled cellulose aerogel is promising for applying on building walls as an effective thermal insulation material. On the other hand, if the material is repellent to water, it can be applied onto the exterior sides of the walls to protect buildings from moisture attack. Therefore, a water repellent agent(ReviveX® Nubuck) or MTMS was applied on the surface of the recycled cellulose aerogel via a physical or chemical method. As shown in Fig. 6a, the surface of the aerogel is covered by the water repellent polymer and all the pores are fully covered. In contrast, the MTMS-functionalized sample still has a porous structure (Fig. 6b). Water contact angle measurements were performed for the original uncoated sample and the coated samples (Fig. 6c and d). For the uncoated sample, water is easily absorbed by the aerogel due to the
hydrophilic nature of cellulose. As can be seen in Fig. 6c and d, the physically coated sample has a water contact angle of 130.7◦, which is smaller than that of the chemically coated sample (135.2◦). This indicates that the MTMS coating is more water repellent than the coating with the commercial agent. The samples were then exposed in air and sunlight for several days and their water contact angles were measured during the exposure time (Fig. 6e). It can be seen that both of the two samples show little changes in water contact angle, indicating their excellent water repellent durability. When the material is coated with MTMS, it will become hydrophobic and oleophilic and therefore, has a good affinity to oil. The MTMS-coated recycled cellulose aerogel was used for the oil absorption test (Fig. 7). It shows strong affinities to both of the motor and cooking oils with high oil uptake contents of 18 and 17.6 g g−1, respectively. After being coated with MTMS, the material shows a thermal conductivity value of 0.029Wm−1K−1, which is lower than the thermal conductivity (0.032Wm−1K−1) of the uncoated sample, indicating an improvement of thermal insulation property due to the MTMS coating. As stated above, the total global aerogel market will grow at a very high rate of 19.3% from 2012 to 2017 with more than 80% of aerogels used for thermal and acoustic insulation. Therefore, with high thermal insulation property, our recycled cellulose aerogel is extremely promising for the industrial insulation market.
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