Thermal energy storage (TES) systems using phase change material (PCM) have been recognized as one of the most advanced energy technologies in enhancing the energy efficiency and sustainability of ...buildings. Now the research is focus on suitable method to incorporate PCMs with building. There are several methods to use phase change materials (PCMs) in thermal energy storage (TES) for different applications. Microencapsulation is one of the well known and advanced technologies for better utilization of PCMs with building parts, such as, wall, roof and floor besides, within the building materials. Phase change materials based microencapsulation for latent heat thermal storage (LHTS) systems for building application offers a challenging option to be employed as effective thermal energy storage and a retrieval device. Since the particular interest in using microencapsulation PCMs for concrete and wall/wallboards, the specific research efforts on both subjects are reviewed separately. This paper presents an overview of the previous research work on microencapsulation technology for thermal energy storage incorporating the phase change materials (PCMs) in the building applications, along with few useful conclusive remarks concluded from the available literature.
Gum arabic finds extensive application and typically undergoes sterilization prior to utilization in the food industry. This study explored the impact of steam sterilization temperature and duration ...on the physicochemical and emulsification characteristics of gum arabic, accompanied by proposed mechanisms elucidating observed effects. The results showed that when gum arabic was treated with high temperature sterilization (110 °C ∼ 140 °C), the emulsion prepared turned unstable. The interfacial tension decreased from 8.26 mN/m to 6.77 mN/m after sterilization, while the elastic modulus decreased from 23.65 mN/m to 16.16 mN/m. Moreover, the circular dichroic chromatographic results indicated that the arabinogalactan protein (AGP) structure of gum arabic was more relaxed after high temperature treatment with β-sheets content decreased from 36.2 % to 29.8 % and random coil content increased from 41.3 % to 51.8 %. Quartz crystal microbalance with dissipation (QCM-D) results demonstrated that emulsion surface film thickness and toughness decreased after sterilization treatment of gum arabic. The study indicates that high temperature sterilization may change protein structure in gum arabic and reduce the stability of prepared emulsions.
Curcumin is a natural pigment with health benefits and potential uses in food and pharmaceutical products, but its application is limited by its insolubility and instability. This study was to ...examine the effect of spray drying and freeze drying methods, as well as 12 combinations of ternary-composite wall materials, on microencapsulation efficiency (MEE), physicochemical properties (including particle size distribution, morphology, moisture content, and color values), and stability of curcumin against environmental stresses and in a model beverage. Curcumin encapsulated by freeze drying presented higher MEE, whereas spray drying produced microparticles of smaller particle size, smoother granule surface, and more regular shapes. Though to different extent, curcumin encapsulated by both methods exhibited improved stability against heat and acidity, and improved stability in a carbonated beverage. This study provides practical information on the selection of wall materials and encapsulation methods for microencapsulating curcumin for various applications.
•Curcumin encapsulated by freeze drying presented higher microencapsulation efficiency.•Spray drying produced curcumin microparticles with smaller and regular granules.•Microencapsulation by both methods improved stability against heat and acidity.•Modified starch was more stable against acidity than inulin as a structural material.•Inulin worked better in carbonated beverage for its stronger coating ability.
Inside Cover: In article number 2200110 by Markus Andersson Trojer and co‐workers, a wet‐spinning process for producing polysaccharide‐based filaments and nonwovens with incorporated carrier ...vehicles—microcapsules or mesoporous silica nanoparticles—is presented. The carrier vehicles allow for much more efficient loading of model actives into the fiber material. The carrier vehicle can be chosen such that the active is either permanently encapsulated or is able to be released.
The full combination of high sensitivity indication and long-lasting bacteriostatic function is an innovative need to meet the practicality of intelligent film packaging systems for food products. ...Hence, Blueberry anthocyanins (BA) copigmentated by ferulic acid (FA) was used as an indicator, and cinnamon essential oil (CO) encapsulated by β-cyclodextrin (β-CD) as a bacteriostat, potato starch (PS) as a film-forming substrate to prepared a dual-function starch-based intelligent active packaging film with pH indicator and antibacterial function. FA had the best copigmentation effect with a threefold increase in a value compared to other phenolic acids. The ΔE value increased from 3.24 to 5.13 at pH 2–8, and the change was still prominent in acid-base alternating test, indicating a high response sensitivity. Notably, the yellow gamut of indicating terminus increased its visibility to the naked eye. The release behavior of CO from film was in line with Fick's diffusion. Meanwhile, the release of CO delayed to about 90 h through β-cyclodextrin encapsulation, showing a high growth-inhibition rate in E. coli and S. aureus of almost 100 %. In this study, a dual-function film with indication and bacteriostasis was prepared and enhanced with both, expanding its wide application in intelligent packaging of fresh food.
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•A dual-function film with indication and bacteriostasis was constructed•Copigmention facilitated pH responsive sensitivity and reversibility of films•Slow-release behavior of essential oils from β-cyclodextrin conformed to Fick model•Film exhibited long-term bacteriostasis via inhibiting S. aureus and E. coli
Organic metal halide perovskite solar cells (PSCs) bearing both high efficiency and durability are predominantly challenged by inadequate crystallinity of perovskite. Herein, a polymer ...microencapsulation‐expansion‐contraction strategy is proposed for the first time to optimize the crystallization behavior of perovskite, typically by adeptly harnessing the swelling and deswelling characteristics of poly(4‐acryloylmorpholine) (poly(4‐AcM)) network on PbI2 surface. It can effectively retard the crystallization rate of perovskite, permitting meliorative crystallinity featured by increased grain size from 0.74 to 1.32 µm and reduced trap density from 1.12 × 1016 to 2.56 × 1015 cm−3. Moreover, profiting from the protection of poly(4‐AcM) microencapsulation layer, the degradation of the perovskite is markedly suppressed. Resultant PSCs gain a robust power conversion efficiency (PCE) of 24.04%. Typically, they maintain 91% of their initial PCE for 13 008 h in a desiccated ambient environment and retain 92% PCE after storage for 4000 h with a relative humidity of 50 ± 10%, which is the state‐of‐the‐art long‐term stability among the reported contributions.
Microencapsulation of PbI2 and perovskite crystals with the in situ polymerized poly(4‐acryloylmorpholine) (poly(4‐AcM)): this novel strategy modulates the PbI2‐ammonium salt reaction through poly(4‐AcM) microencapsulation‐expansion‐contraction behavior. The resultant decelerated crystallization rate fosters high‐quality perovskite film formation, achieving a notable power conversion efficiency (PCE) of up to 24.04%. Remarkably, after 13 008 h in dry storage, the PCE impressively retains 91% of its initial efficiency.
This study evaluated maltodextrin (MD) and gelatin (GEL) in different ratios (SO1, MD only; SO2, MD and GEL = 2:1; and SO3, MD and GEL = 1:1, respectively) as wall materials to microencapsulation of ...sweet orange essential oil (SOEO, 10% w/w). SOEO microspheres were obtained by emulsification/lyophilization and characterized regarding the microencapsulation yield and efficiency, infrared spectroscopy, ultrastructural aspects (scanning electron microscopy, SEM), thermogravimetric (TG), derivative thermogravimetry (DTG) and differential exploratory calorimetry (DSC) and bioactive properties. Yield and SOEO microencapsulation efficiency (MEE) was of up to 90.19 and 75.75%, respectively. SEM analysis showed SO1, SO2 and SO3 microspheres with irregular shapes. Although improvements in thermal stability of all formulated microspheres were observed, TG and DTG curves indicated slower rates of volatilization and degradation of SOEO in SO1. DSC curves indicated that SO1, SO2 and SO3 microsphere formulations were effective in protecting SOEO, especially in relation to improvements in oxidative stability. Antibacterial and antioxidant properties, as well as total phenolic content of SOEO, were maintained in all formulated microspheres. SOEO microspheres can be prepared using MD and GEL and lyophilization, resulting in high yields, MEE, stability and preservation of antioxidant and antimicrobial properties.
Microalgae (MA) are the most abundant seaweeds with high nutritional properties. They are accepted as potential biocatalysts for the bioremediation of wastewater. They are widely used in food, feed, ...and biofuel industries and can potentially be food for future generations. MA-based purification of wastewater technology could be a universal alternative solution for the recovery of resources from wastewater for low-cost biomass feedstock for industry. They provide a wide range of functional components, viz. omega-3 fatty acids, along with a plenteous number of pigments such as ß-carotene, astaxanthin, lutein, phycocyanin, and chlorophyll, which are used extensively as food additives and nutraceuticals. Further, proteins, lipids, vitamins, and carbohydrates are described as nutritional characteristics in MA. They are investigated as single-cell protein, thickening/stabilizing agents, and pigment sources in the food industry. The review emphasizes the production and extraction of nutritional and functional components of algal biomass and the role of microalgal polysaccharides in digestion and nutritional absorption in the gastrointestinal tract. Further, the use of MA in the food industry was also investigated along with their potential therapeutic applications.
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