فهرس المقالات Nano-capsules

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  1 - Nano-encapsulation of thyme essential oil in chitosan-Arabic gum system: evaluation of its antioxidant and antimicrobial properties
  Maryam Hassani Shirin Hasani
  In this study Nano–capsules based on chitosan (CS) and Arabic Gum (GA) with Thyme essential oil (TEO) as an active ingredient were prepared using emulsion method. The nano–capsules were characterized by their Encapsulation efficiency (EE), morphologies, Part أکثر

  In this study Nano–capsules based on chitosan (CS) and Arabic Gum (GA) with Thyme essential oil (TEO) as an active ingredient were prepared using emulsion method. The nano–capsules were characterized by their Encapsulation efficiency (EE), morphologies, Particle size distributions, Zeta potential and Release (RE). Results showed that nano–capsules produced by using relative ratio CS: GA (1.5%:8.5%) clearly showed the highest Encapsulation efficiency (77.67%) and Zeta potential value (+ 43.17 mV). In vitro release studies demonstrated a prolonged release for the samples with larger CS ratio. Most nano–capsules sizes ranged from 385.2 to 756.1 nm. Scanning electron microscopy (SEM) images showed nano–capsules had a rough surface without the spherical shape for all samples. Quantitative values of antioxidant activity of Thyme essential oil and nano–encapsulated essential oil were studied. The essential oils were investigated for their antibacterial activity against common Gram–positive and Gram–negative pathogenic microorganisms (Staphylococcus aureus and Escherichia coli) by Disk diffusion and dilution method (MIC). Our results reported the better antioxidant and antibacterial effects of the encapsulated TEO in comparison with free TEO. Finally, the mixture of CS: GA at (1.5%:8.5%) can be suggested as suitable wall material for Thyme essential oil encapsulation. تفاصيل المقالة
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  2 - Production, Characterization and Application of Nano - Phase Change Materials: A Review
  Pouriya Norooz Kermanshahi Graça Soares
  10.30495/ijtnbm.2022.692496
  Phase Change Materials (PCMs) for heat storage and energy saving has been extensively used in many fields for heating and cooling processes, including building, solar energy, textiles, agriculture, and electronics. PCMs have been getting incredible attention for being l أکثر

  Phase Change Materials (PCMs) for heat storage and energy saving has been extensively used in many fields for heating and cooling processes, including building, solar energy, textiles, agriculture, and electronics. PCMs have been getting incredible attention for being low-cost materials and have potential materials for thermal energy storage (TES) with long cycle life. Though, the disadvantages such as flow, result in encapsulation in three scales of Macro, Micro and Nano capsules. Encapsulating PCM reduces the disadvantages and improves the efficiency of PCMs. Different methods for producing PCMs in the scale of nano and core-shell materials, have been developed and the capsules size in relation to parameters such as pH, stirring rate, material selection and preparation method have been investigated. In recent years, this subject has been extensively studied, seeking to find more efficient and safer PCMs. In this context, nanoscale PCMs have been produced and applied to the most diverse products and their performance evaluated. They simply modified and optimized production processes. The novelty of this study lies in the fact that merely a few articles have reviewed nano-encapsulating of PCMs, focusing on new developments on PCM nano-capsules. Moreover, few articles have compared nano and microcapsules of PCMs so far. The analyzed papers suggest that the production methods influence the size of the obtained capsules. The purpose of this article is to make an updated review of the synthesis and application of nano-encapsulated PCMs. تفاصيل المقالة