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Silica aerogel coated on metallic wire by phase separation of polystyrene for in–tube solid phase microextraction

Baktash, M. Y ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1016/j.chroma.2017.04.011
  3. Publisher: Elsevier B.V , 2017
  4. Abstract:
  5. In this research, an attempt was made toward synthesizing a sol–gel–based silica aerogel and its subsequent coating on a copper wire by phase separation of polystyrene. Adaption of this new approach enabled us to coat the metallic wire with powder materials. The use of this method for coating, led to the formation of a porous and thick structure of silica aerogel. The coated wire was placed in a needle and used as the sorbent for in–tube solid phase microextraction of chlorobenzenes (CBs). The superhydrophobicity of sorbent on extraction efficiency was investigated by using different ratios of tetraethylorthosilicate/methyltrimethoxysilane. The surface coated with the prepared silica aerogel by the phase separation of polystyrene showed high contact angle, approving the desired superhydrophobic properties. Effects of major parameters influencing the extraction efficiency including the extraction temperature, extraction time, ionic strength, desorption time were investigated and optimized. The limits of detection and quantification of the method under the optimized condition were 0.1–1.2 and 0.4–4.1 ng L−1, respectively. The relative standard deviations (RSD%) at a concentration level of 10 ng L−1 were between 4 and 10% (n = 3). The calibration curves of CBs showed linearity from 1 to100 ng L−1. Eventually, the method was successfully applied to the extraction of model compounds from real water samples and relative recoveries varied from 88 to 115%. © 2017 Elsevier B.V
  6. Keywords:
  7. Gas chromatography–mass spectrometry ; In–tube microextraction ; Phase separation ; Silica aerogel ; Sol–gel process ; Superhydrophobicity ; Aerogels ; Chromatography ; Coatings ; Efficiency ; Electric circuit breakers ; Gas chromatography ; Hydrophobicity ; Ionic strength ; Mass spectrometry ; Separation ; Silica ; Silica gel ; Sol-gel process ; Wire ; Extraction efficiencies ; In-tube solid phase microextraction ; Microextraction ; Relative standard deviations ; Silica aerogels ; Tetra-ethyl-ortho-silicate ; Extraction ; Chlorobenzene ; Copper ; Polystyrene ; Sorbent ; Tetraethoxysilane ; Trimethoxymethylsilane ; Polystyrene derivative ; Silane derivative ; Aerogel ; Analytical equipment ; Article ; Calibration ; Chemical parameters ; Concentration (parameters) ; Contact angle ; Controlled study ; Desorption ; Extraction time ; Gel ; Limit of detection ; Limit of quantitation ; Material coating ; Metallic wire ; Needle ; Powder ; Synthesis ; Temperature ; Water analysis ; Chemistry ; Devices ; Evaluation study ; Isolation and purification ; Osmolarity ; Procedures ; Solid phase microextraction ; Water pollutant ; Osmolar concentration ; Polystyrenes ; Silanes ; Silicon dioxide ; Water pollutants, chemical
  8. Source: Journal of Chromatography A ; Volume 1500 , 2017 , Pages 69-75 ; 00219673 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0021967317305484