![]() ![]() It is the load-bearing component in plant cell walls, and can be disintegrated from chemical wood pulp fibers in the form of colloidal nanofibrils in water suspension. Nanocellulose derived from renewable resources, such as wood, is highly interesting for combination with phase change constituents. However, more environmentally friendly chemicals or encapsulation processes are desirable. This includes petroleum-based polymethylmetha-crylate (PMMA), polystyrene (PS), urea formaldehyde (UF), polyurea, and melamine formaldehyde (MF). Various polymeric shell materials have been investigated. Used interfacial, in-situ, or emulsion polymerization, sol-gel methods, or their combinations. Such encapsulation can be obtained by physical methods such as spray drying, air suspension coating, solvent evaporation, or shear force emulsification. Typically, encapsulation technologies are applied to address the leakage problem by enclosing the paraffin in a stable "container". However, paraffin leakage and low thermal conductivity restrict their applications. Paraffin-based phase change materials (PCM) can store and release large amounts of energy, including solar energy, as latent heat. Nanomaterials science and engineering can extend energy-saving technologies by proposing new building materials, where structural and energy-saving characteristics are integrated. Additionally, solar energy is clean, free, and inexhaustible. Solar energy is attractive, because the estimated potential of solar energy is in the range of 1575- 49,837 EJ/year, which is roughly 3-100 times the primary energy consumption worldwide during 2008. It is therefore a priority to reduce the consumption in the building sector through cleaner energy with increased harvesting and application efficiency. accounts for as much as 30-40% of the total energy consumption. In the building sector, requirements for electric light, air conditioning, refrigeration, water heating, etc. The PCM composite can be extended to panels used in energy-efficient smart buildings with thermal regulation integrated in load-bearing structures.Īround two thirds of the greenhouse gas emissions in the world are related to energy production and use. ![]() No obvious leakage was observed during heating/cooling cycles, as supported by DSC and SAXS data. The thermal regulation function of the PCM composite was demonstrated in the form of a model roof under simulated sunlight. Morphology was characterized using FE-SEM. The PCM composite was lightweight and showed a solid content of paraffin of more than 72 wt%. Particle formation was characterized by dynamic light scattering and they were processed into stable PCM/CNF composites in the form of PCM paper structures with favorable mechanical properties. The thermodynamic drive for phase separation was confirmed by molecular modeling. Here, paraffin was encapsulated by nanocellulose (CNF) through a pickering emulsion method, while simultaneously forming a composite material. Non-leaking, green materials with high content of phase change materials (PCM) can conserve solar energy and contribute to a sustainable society. Wallenberg Wood Science Center, Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden Yuanyuan Li*, Shun Yu, Pan Chen, Ramiro Rojas, Alireza Hajian, Lars Berglund* Contents lists available at ScienceDirectĬellulose nanofibers enable paraffin encapsulation and the formation of stable thermal regulation nanocomposites The PCM composite can be extended to panels used in energy-efficient smart buildings with thermal regulation integrated in load-bearing structures. The PCM composite was lightweight and showed a solid content of paraffin of more than 72wt%. Abstract of research paper on Materials engineering, author of scientific article - Yuanyuan Li, Shun Yu, Pan Chen, Ramiro Rojas, Alireza Hajian, et al. ![]()
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