CAS 10102-17-7 Sodium Thiosulfate Pentahydrate

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Sodium Thiosulfate Pentahydrate

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ACM10102177

CAS Number

10102-17-7

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Sodium Thiosulfate Pentahydrate

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Preparation of Sodium Thiosulfate Pentahydrate-Based Microcapsule Phase Change Materials

Fu W, et al. Solar Energy Materials and Solar Cells, 2019, 193, 149-156.

Sodium thiosulfate pentahydrate (STP) has high latent heat and high density, which are key to achieving high volumetric energy density. Using STP salt hydrate as the core and polyethyl 2-cyanoacrylate (PECA) as the shell, an embedded phase change material (PCM) was developed through an interfacial polymerization in a water-inoil (W/O) emulsion system.
Preparation of STP@PECA microcapsules
· An aqueous solution containing 0.6 g STP and 0.4 g deionized water was added into oil phase obtained by mixing 8.55 g cyclohexane and 0.45 g emulsifiers composed of span-20 and tween-80 with mass ratio of 2:3.
· Then, the mixture was magnetically stirred for 1 h at 700 rpm in a water bath of 25 °C to create an initial macroemulsion. Subsequently, the resulting macroemulsion was sonicated for 15 min in an ice-water bath using a sonicator.
· After a stable W/O emulsion was formed, 6 ml chloroform solution containing 0.3 g ethyl-2-cyanoacrylate (ECA) was added dropwise to the emulsion under a constant agitation of 200 rpm for several minutes.
· The reaction was carried out at 15 °C for 3 h under the stirring speed of 200 rpm. After the reaction, the obtained microcapsule suspension is centrifuged, washed and dried to obtain the STP@PECA microcapsule product.

Improvement of Thermal Conductivity of Sodium Thiosulfate Pentahydrate Phase Change Material

Rabady R I, et al. Journal of Energy Storage, 2020, 27, 101166.

To overcome the limitations of low thermal conductivity on its application, the thermal conductivity and specific heat of sodium thiosulfate pentahydrate (STP) as a basic phase change material (PCM) can be improved by introducing nanofillers. Among them, carbon nanotubes (CNT) and graphite nanoparticles (GNP) are effective modified fillers. The thermal conductivity of STP composites with the addition of 7% GNP and 7% CNT increased by 155.33% and 249.61%, respectively.
Preparation of STP-based composite PCM
· Pre-melting of pure PCMs, to homogenize the pure PCM. Sodium thiosulfate pentahydrate should be melted until is converted to liquid phase at 50-60 °C.
· The measured amount of nano-fillers is added to liquid Sodium thiosulfate pentahydrate, and then the composites were prepared by shear mixing with a magnetic stirrer for 20 min, followed by ultrasonic shaking for 50 min.
· To the above solution, Carboxymethyl cellulose (CMC) and sodium dodecyl sulfate (SDS) were mixed and thoroughly stirred. The CMC used as a stabilizing or nucleating agent, and SDS used as a surfactant.
· The molten composite is poured gently into a rectangular mold then put it in hydraulic press to take the mold shape without bubbles and allowed to solidify at room temperature.

Crystal Water in Sodium Thiosulfate Pentahydrate Promotes the Synthesis of Heteroaryl Thioether

Ma X, et al. The Journal of Organic Chemistry, 2019, 84(17), 11294-11300.

The crystal water in sodium thiosulfate pentahydrate (Na2S2O3 ·5H2O) can promote the MCR of heteroaryl chlorides, Na2S2O3 ·5H2O and alcohols, thus providing a simple, green and specific one-step synthesis method of asymmetric heteroaryl thioethers. In this method, the crystallization water in Na2S2O3·5H2O is crucial to generate the key thiol intermediate and the by-product NaHSO4. NaHSO4 can catalyze the dehydration substitution reaction between the thiol intermediate and the alcohol, and finally obtain the unsymmetrical heteroaryl thioethers. This method is applicable to a variety of substrates.
General procedure for the synthesis of asymmetric heteroaryl thioethers
· A mixture of 2-pyridyl chloride 1a (56.5 mg, 0.50 mmol), Sodium thiosulfate pentahydrate (248.0 mg, 1.0 mmol, 2.0 equiv.) and benzyl alcohol 2a (54.0 mg, 0.50 mmol, 1.0 equiv.) was sealed in a Schlenk tube (20 mL) under N2, and stirred at 140 °C (oil bath) for 12 h. The reaction was then monitored by TLC and/or GC-MS.
· After completion of the reaction, the reaction mixture was purified by flash column chromatography on silica gel using ethyl acetate and petroleum ether (0~ 1/50) as the eluent, giving 3aa in 86% isolated yield.

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