Synthesis, properties and thermokinetics of a kind of diesters as phase change materials

Xu, Shixiang; Du, Mengyu; Zhang, Zhaoxia; Shao, Min; Zhang, Guoqing; Zhou, Lan

doi:10.1016/j.solener.2022.02.043

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…On the other hand, Chi-MMW, weight loss after 250°C is due to further dehydration, deacetylation, and depolymerization ( de Britto and Campana-Filho, 2007 ). MM maximum weight loss was found at 283°C; this step is normally attributed to volatilization rather than thermal degradation ( Xu et al, 2022 ).…”

Section: Resultsmentioning

confidence: 99%

Enzymatic Active Release of Violacein Present in Nanostructured Lipid Carrier by Lipase Encapsulated in 3D-Bioprinted Chitosan-Hydroxypropyl Methylcellulose Matrix With Anticancer Activity

et al. 2022

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Violacein (Viol) is a bacterial purple water-insoluble pigment synthesized by Chromobacterium violaceum and other microorganisms that display many beneficial therapeutic properties including anticancer activity. Viol was produced, purified in our laboratory, and encapsulated in a nanostructured lipid carrier (NLC). The NLC is composed of the solid lipid myristyl myristate, an oily lipid mixture composed of capric and caprylic acids, and the surfactant poloxamer P188. Dormant lipase from Rhizomucor miehei was incorporated into the NLC-Viol to develop an active release system. The NLC particle size determined by dynamic light scattering brings around 150 nm particle size and ζ≈ −9.0 mV with or without lipase, but the incorporation of lipase increase the PdI from 0.241 to 0.319 (≈32%). For scaffold development, a 2.5 hydroxypropyl methylcellulose/chitosan ratio was obtained after optimization of a composite for extrusion in a 3D-bioprinter developed and constructed in our laboratory. Final Viol encapsulation efficiency in the printings was over 90%. Kinetic release of the biodye at pH = 7.4 from the mesh containing NLC-lipase showed roughly 20% Viol fast release than without the enzyme. However, both Viol kinetic releases displayed similar profiles at pH = 5.0, where the lipase is inactive. The kinetic release of Viol from the NLC-matrices was modeled and the best correlation was found with the Korsmeyer-Peppas model (R2 = 0.95) with n < 0.5 suggesting a Fickian release of Viol from the matrices. Scanning Electron Microscope (SEM) images of the NLC-meshes showed significant differences before and after Viol’s release. Also, the presence of lipase dramatically increased the gaps in the interchain mesh. XRD and Fourier Transform Infrared (FTIR) analyses of the NLC-meshes showed a decrease in the crystalline structure of the composites with the incorporation of the NLC, and the decrease of myristyl myristate in the mesh can be attributed to the lipase activity. TGA profiles of the NLC-meshes showed high thermal stability than the individual components. Cytotoxic studies in A549 and HCT-116 cancer cell lines revealed high anticancer activity of the matrix mediated by mucoadhesive chitosan, plus the biological synergistic activities of violacein and lipase.

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Section: Resultsmentioning

confidence: 99%

Enzymatic Active Release of Violacein Present in Nanostructured Lipid Carrier by Lipase Encapsulated in 3D-Bioprinted Chitosan-Hydroxypropyl Methylcellulose Matrix With Anticancer Activity

et al. 2022

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“…Octyl stearate was first synthesized using octadecanoic acid and n -octanol as raw materials according to our previous work . The photothermal conversion and energy storage MEPCMs were then prepared by the route shown in Figure .…”

Section: Methodsmentioning

confidence: 99%

“…Paraffin or fatty acid were selected as energy storage PCMs in the above studies; however, the above PCMs have lower thermal evaporation temperatures, resulting in significant limitations in the postprocessing. , In recent years, many researchers have developed ester PCMs with high latent heat, a low degree of supercooling, and high thermal stability, which are very promising as phase change energy storage materials. − …”

Section: Introductionmentioning

confidence: 99%

“…Octyl stearate was first synthesized using octadecanoic acid and n-octanol as raw materials according to our previous work. 29 The photothermal conversion and energy storage MEPCMs were then prepared by the route shown in Figure 1. Typically, 4 g of TMPTA, 5 g of octyl stearate, 0.15 g of AIBN, and 0.8 g of tween 20 were dispersed in 80 mL of deionized water at 50 °C.…”

Section: ■ Introductionmentioning

confidence: 99%

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Sunlight-Triggered Phase Change Energy Storage Composite Materials for Human Body Thermal Management

Zhou

et al. 2022

ACS Appl. Polym. Mater.

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In order to maintain thermal comfort in the human body, photothermal conversion and energy storage microcapsules were designed, developed, and applied in a light-assisted thermoregulatory system. The octyl stearate as a phase change material (PCM) was encapsulated using a polytrimethylolpropane triacrylate (PTMPTA)/polyaniline (PANI) composite as the shell, which was synthesized by adding the intermediate half oxidation state of PANI into the polymerization system of trimethylolpropane triacrylate (TMPTA). In the PCM microcapsules, the PANI particles embedded in the shell can convert sunlight into heat energy to feed the PCM core for energy storage, further realizing the temperature regulation and solving the problem that the phase change behavior cannot be triggered in cold environments. The octyl stearate@PTMPTA/PANI microcapsules exhibit a latent heat of over 103 J/g, good thermal reliability, and 89.12% photothermal conversion efficiency (PCM microcapsules (MEPCM) suspension). Owing to the excellent photothermal performance of the PANI, the thermal energy will be generated under sunshine and simultaneously transferred to the microcapsules for energy storage. As a result, the MEPCM-PTMPTA/PANI can not only achieve a higher temperature than ambient air but also initiate the phase transition process. The obtained microcapsules were further printed on a T-shirt, and a test of self-thermoregulation was carried out in winter. The results suggest that MEPCM-PTMPTA/PANI has good photothermal conversion and temperature regulation capacity under sunshine and low temperature environments.

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“…El máximo de pérdida de peso de MM se encontró a 283°C y se atribuye normalmente a la volatilización de la sustancia y no a su degradación [107].…”

Section: Análisis Termogravimétricounclassified

Sistemas de vehiculización del antitumoral violaceína para uso terapéutico

Berti¹

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En el presente trabajo se detallan los resultados obtenidos fruto de la investigación para la vehiculización del pigmento de origen bacteriano violaceína, con el objetivo de crear sistemas terapéuticos antitumorales. La sección siguiente constituye una breve introducción al campo de aplicación de estos sistemas (el cáncer), así como información específica del funcionamiento de la violaceína, las problemáticas asociadas a su administración y una descripción general de los sistemas de vehiculización empleados. La sección 3, contiene los objetivos de esta tesis. En la sección 4, se describe un sistema pH-responsivo basado en los biopolímeros pectina y gelatina, con el objetivo de lograr una administración oral y una liberación del fármaco en colon. En la sección 5, se muestra un sistema basado en nanopartículas lipídicas en el que se buscó obtener un direccionamiento activo hacia células que sobre expresen receptores de folato. En la sección 6, se presenta un sistema con el objetivo de ser implantado, basado tanto en nanopartículas lipídicas como en biopolímeros, con dos adiciones; una enzima activa, con el doble propósito de actuar de manera terapéutica pero también estimular la liberación de violaceína y que el sistema se ha diseñado como una tinta para impresión 3D. En la sección 7 se ofrecen las conclusiones finales respecto de los capítulos anteriores y las secciones 8, 9 y 10 contienen la Bibliografía, las abreviaturas y una tabla de figuras respectivamente.

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Synthesis, properties and thermokinetics of a kind of diesters as phase change materials

Cited by 6 publications

References 30 publications

Enzymatic Active Release of Violacein Present in Nanostructured Lipid Carrier by Lipase Encapsulated in 3D-Bioprinted Chitosan-Hydroxypropyl Methylcellulose Matrix With Anticancer Activity

Enzymatic Active Release of Violacein Present in Nanostructured Lipid Carrier by Lipase Encapsulated in 3D-Bioprinted Chitosan-Hydroxypropyl Methylcellulose Matrix With Anticancer Activity

Sunlight-Triggered Phase Change Energy Storage Composite Materials for Human Body Thermal Management

Sistemas de vehiculización del antitumoral violaceína para uso terapéutico

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