Microencapsulation of ethanol-soluble inorganic salts for high temperature thermal energy storage

Mo, Bingzhong; Mo, Songping; Jia, Lisi; Wang, Zhibin; Chen, Ying

doi:10.1016/j.matchemphys.2021.125261

Cited by 11 publications

(7 citation statements)

References 12 publications

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“…The utilization of microencapsulated molten salts not only prevents leakage, but also enhances the thermal properties performance of the PCM. However, only a few studies have been reported on the microencapsulation of molten salts. − These studies mainly focused on developing new methods for the microencapsulation of molten salts since the conventional methods are not applicable to molten salts. As an example, Zhang et al reported the preparation of KNO 3 @silica microcapsules using a water-limited sol–gel silica encapsulation method for high-temperature applications.…”

Section: Introductionmentioning

confidence: 99%

“…Similarly, Pethurajan et al synthesized microcapsules of solar salt, which exhibited no leakage in leak tests, while exhibiting a 51% increase in thermal conductivity and a 10.5% reduction in supercooling degree. Molten salts were microencapsulated with metal oxide shells including SiO 2 , − TiO 2 , ZnO, and perhydropolysilazane (PHPS) . Microencapsulation methods were developed and demonstrated by studying the morphology, chemical composition, phase change properties (i.e., phase change temperature and latent heat), and thermal reliability of the microcapsules in most of these papers.…”

Section: Introductionmentioning

confidence: 99%

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Improving the Thermal and Photothermal Performances of MXene-Doped Microencapsulated Molten Salts for Medium-Temperature Solar Thermal Energy Storage

Xiao

et al. 2023

Energy Fuels

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Molten salts are widely used as thermal energy storage materials for solar thermal applications, but they suffer from low photothermal conversion efficiency and potential leakage and corrosion issues. In this paper, MXene doping was proposed to improve the thermal properties and photothermal conversion efficiency of microencapsulated molten salts. MXene nanomaterials, which have excellent thermal conductivity and photothermal conversion efficiency, were used to dope the molten salts. The results tested by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) indicate that MXene was well doped in the molten salt microcapsules. Fourier transformation infrared (FT-IR) spectroscopy was used to confirm that the microencapsulation of the molten salt by silica is a physical action. The results of X-ray diffractometry (XRD) show that the crystal structure of the molten salt maintained stability. The results obtained from the Hot Disk thermal constant analyzer and photothermal conversion experiments showed that thermal conductivity and photothermal conversion efficiency of the MXene-doped microcapsules were increased by 156.2% and 169.4%, respectively. The differential scanning calorimeter (DSC) results indicated that the MXene-doped microcapsules had a reduction of 49.6% in the supercooling degree. The thermal reliability of the MXene-doped microcapsules was 94.0% after 50 thermal cycles. This approach provides a promising solution for improving the thermal properties and photothermal conversion efficiency of microencapsulated molten salts for medium-temperature solar thermal energy storage.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Thermal and Photothermal Performances of MXene-Doped Microencapsulated Molten Salts for Medium-Temperature Solar Thermal Energy Storage

Xiao

et al. 2023

Energy Fuels

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“…A low solubility of the drugs in the continuous phase is required for obtaining a high yield. Depending on the solubility of the drug, simple or multiple emulsion techniques like oil‐in‐water (O/W) or water‐in‐oil‐in‐water (W/O/W) methods are used 12–19 . For insoluble or poorly water soluble drugs the O/W method is frequently used, while for hydrophilic or water soluble drugs the W/O/W method is used.…”

Section: Introductionmentioning

confidence: 99%

“…Depending on the solubility of the drug, simple or multiple emulsion techniques like oil-inwater (O/W) or water-in-oil-in-water (W/O/W) methods are used. [12][13][14][15][16][17][18][19] For insoluble or poorly water soluble drugs the O/W method is frequently used, while for hydrophilic or water soluble drugs the W/O/W method is used. Many types of drugs with different physical and chemical properties have been formulated into polymeric microparticle systems, including anti-cancer drugs, narcotic agents, local anaesthetics, steroids and fertility control agents.…”

Section: Introductionmentioning

confidence: 99%

Preparation and evaluation of various formulation effects of the second emulsion on the shape and release profile of propranolol HCl from ethyl cellulose microparticle blends

Muhaimin

Chaerunisaa

Bodmeier

2022

Polymer International

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The objective of this study was to investigate and characterize incorporated propranolol HCl (Pro) within ethyl cellulose microparticle blends using the solvent evaporation method. The microparticle blends were prepared with a water‐in‐oil‐in‐water (W/O/W) solvent evaporation method and contained the same drug Propranolol HCl (Pro). The first Pro emulsion (W/O) and second Pro emulsion (W/O) were dispersed in an external aqueous phase, with a dispersion time interval (DTI) of 0 and 60 min. The morphology of the microparticle blends was characterized by SEM. The mean particle size, chord length distribution and chord count of the emulsion droplets/hardened microparticles were monitored by focused beam reflectance measurement (FBRM). The encapsulation efficiency and in vitro drug release in phosphate buffer (pH 7.4) were also investigated. The resulting microparticles were spherical, of two populations. The mean particle size of the microparticle blends ranged from 104.26 μm to 127.64 μm. The encapsulation efficiency was about 76.53% to 78.81% for propranolol HCl in the microparticle blends. FBRM studies showed that the size of the microparticle blends prepared by the W/O/W (Pro) method with DTI 60 min and stirring time 4 h was larger than that of the microparticle blends with DTI 0 min. In vitro drug release studies after 28 days showed that the propranolol HCl release from microparticle blends with DTI 60 min (54.05%) was slower than from microparticle blends with DTI 0 min (73.28%). Based on these data, there is an interaction of the second primary emulsion with hard particles from the first primary emulsion, whereby the second primary emulsion blocked and coated pores on the surface of hard particles from the first primary emulsion. These blocking and coating effects of the microparticles depended on the method and the DTI. In conclusion, novel microparticle blends containing drugs of the same solubility offer high potential for controlled release drug delivery systems. © 2022 The Authors. Polymer International published by John Wiley & Sons Ltd on behalf of Society of Industrial Chemistry.

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“…Ada beberapa variasi teknik penguapan pelarut yang telah dikembangkan untuk mendapatkan efisiensi enkapsulasi obat yang tinggi untuk obat-obat yang bersifat hidrofilik dan hidrofobik [10][11][12][13][14] . Untuk obat yang tidak larut dalam air, metode oil-in-water (O/W) sering digunakan, sedangkan untuk obat yang larut dalam air, metode water-in-oil-in-water (W/O/W) lebih disukai [15][16][17][18][19][20][21] .…”

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Solvent Type Effect on Preparation of Ethyl Cellulose Microparticles

Muhaimin,

Chaerunisaa

2023

IJPST

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The purpose of this study was to investigate effect of solvent type on solidification rate of ethyl cellulose(EC) microparticles and particle size/distribution of emulsion droplets/hardened microparticlesduring solvent evaporation process using focused beam reflectance measurement (FBRM). ECmicroparticles were prepared by an O/W-solvent evaporation method using various solvents, includingdichloromethane, dichloromethane:methanol (1:1), ethyl acetate and chloroform. The particle size/distribution of emulsion droplets/hardened microparticles was monitored by FBRM. The morphologyof EC microparticles was characterized by scanning electron microscopy (SEM). The transformationof emulsion droplets into solid microparticles for all solvents occured within the first 10-60 min. Thesquare weighted mean chord length of EC microparticles which were prepared using chloroform wassmallest, but the chord counts was no the highest. The chord length distribution (CLD) measured byFBRM showed that a larger particle size mean gave longer CLD and a lower peak of particle number.SEM data revealed that the morphology of microparticles was influenced by type of solvent. FBRMcan be employed for online monitoring of the shift in the microparticle CLD and detect transformationof emulsion droplets into solid microparticles during solvent evaporation process. The microparticleCLD and transformation process was strongly influenced by solvent type.Keywords: chord length distribution, ethyl cellulose, FBRM, microparticle, solvent.

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Microencapsulation of ethanol-soluble inorganic salts for high temperature thermal energy storage

Cited by 11 publications

References 12 publications

Improving the Thermal and Photothermal Performances of MXene-Doped Microencapsulated Molten Salts for Medium-Temperature Solar Thermal Energy Storage

Improving the Thermal and Photothermal Performances of MXene-Doped Microencapsulated Molten Salts for Medium-Temperature Solar Thermal Energy Storage

Preparation and evaluation of various formulation effects of the second emulsion on the shape and release profile of propranolol HCl from ethyl cellulose microparticle blends

Solvent Type Effect on Preparation of Ethyl Cellulose Microparticles

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