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Anionic Surfactants

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Jian Shi – One of the best experts on this subject based on the ideXlab platform.

  • synthesis and performance evaluation of paraffin microcapsules with calcium carbonate shell modulated by different Anionic Surfactants for thermal energy storage
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
    Co-Authors: Jian Shi, Rong Sun, Boyuan Ban, Jian Chen

    Abstract:

    Abstract A series of phase change materials (PCMs) microcapsules based on industrial paraffin core and calcium carbonate (CaCO3) shell were successfully synthesized for thermal energy storage. The SEM results revealed that the composites are mainly of spherical morphology. The FT-IR and XRD confirmed that the composites were mainly composed of the vaterite CaCO3, paraffin, and a small amount of calcite CaCO3. Compared with the composites prepared with sodium dodecyl sulfonate (SDS) as Anionic surfactant, DSC and TG results of composites prepared with sodium dodecyl benzene sulfonate (SDBS) demonstrated that the encapsulation efficiency increased but the thermal stability decreased. Besides, with the different concentrations of CaCl2, the influence of Anionic Surfactants on the performance of microcapsules had been discussed. The results exhibited higher encapsulation efficiency of microcapsules with SDBS than that with SDS, even up to ten times. When the mass of CaCl2 is about 0.05 mol, encapsulation efficiency with SDBS can reach up to 20.80%. Accordingly, the super-cooling of PCM was significantly suppressed. From all results, it is worth developing the PCMs microcapsules with CaCO3 shell modulated by different Anionic Surfactants for thermal energy storage and SDBS is more suitable for preparing PCM@CaCO3 microcapsules.

Eduardo Gonzalezmazo – One of the best experts on this subject based on the ideXlab platform.

  • simultaneous extraction and determination of Anionic Surfactants in waters and sediments
    Journal of Chromatography A, 2006
    Co-Authors: Pablo A Laramartin, A Gomezparra, Eduardo Gonzalezmazo

    Abstract:

    Abstract A new method has been developed for the simultaneous determination of the most frequently used Anionic Surfactants – linear alkylbenzene sulfonates (LAS), alkyl ethoxysulfates (AES) and alkyl sulfates (AS) – in aqueous and sediment samples. Preconcentration and purification of water samples are carried out by means of solid-phase extraction (SPE). The efficiency of two different extraction methods for the analysis of sediments – Soxhlet extraction and pressurized liquid extraction (PLE) – has been compared. Identification and quantification of the target compounds is performed using a liquid chromatography – mass spectrometry (LC–MS) system equipped with an electrospray interface (ESI) in negative ion-mode. Homologue recoveries are 85–123% for SPE, 94–112% for Soxhlet extraction and 81–125% for PLE in the case of LAS, and 60–94% for SPE, 61–109% for Soxhlet extraction and 55–99% for PLE in the case of AES, whereas the limits of detection are 0.1–0.5 ng ml−1 in water and 1–5 ng g−1 in sediment. This method has been applied to the determination of Anionic Surfactants in the Guadalete estuary (SW Spain), and LAS concentration levels from 538 to 1014 ng g−1 in sediments and from 25.1 to 64.4 ng ml−1 in waters have been found. AES values from 168 to 536 ng g−1 in sediments and from 4.5 to 11.9 ng ml−1 in waters are reported for the first time in European rivers.

Jian Chen – One of the best experts on this subject based on the ideXlab platform.

  • synthesis and performance evaluation of paraffin microcapsules with calcium carbonate shell modulated by different Anionic Surfactants for thermal energy storage
    Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
    Co-Authors: Jian Shi, Rong Sun, Boyuan Ban, Jian Chen

    Abstract:

    Abstract A series of phase change materials (PCMs) microcapsules based on industrial paraffin core and calcium carbonate (CaCO3) shell were successfully synthesized for thermal energy storage. The SEM results revealed that the composites are mainly of spherical morphology. The FT-IR and XRD confirmed that the composites were mainly composed of the vaterite CaCO3, paraffin, and a small amount of calcite CaCO3. Compared with the composites prepared with sodium dodecyl sulfonate (SDS) as Anionic surfactant, DSC and TG results of composites prepared with sodium dodecyl benzene sulfonate (SDBS) demonstrated that the encapsulation efficiency increased but the thermal stability decreased. Besides, with the different concentrations of CaCl2, the influence of Anionic Surfactants on the performance of microcapsules had been discussed. The results exhibited higher encapsulation efficiency of microcapsules with SDBS than that with SDS, even up to ten times. When the mass of CaCl2 is about 0.05 mol, encapsulation efficiency with SDBS can reach up to 20.80%. Accordingly, the super-cooling of PCM was significantly suppressed. From all results, it is worth developing the PCMs microcapsules with CaCO3 shell modulated by different Anionic Surfactants for thermal energy storage and SDBS is more suitable for preparing PCM@CaCO3 microcapsules.