Gemini Surfactant as a Template Agent for the Synthesis of More Eco-Friendly Silica Nanocapsules
| Autor: | Roberto Martins, Susana Loureiro, João Tedim, Joana Figueiredo, Olga Kaczerewska, Isabel Sousa |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Green chemistry
Thermogravimetric analysis 02 engineering and technology 010402 general chemistry lcsh:Technology 01 natural sciences Nanocapsules lcsh:Chemistry Dynamic light scattering Pulmonary surfactant General Materials Science Microemulsion mesoporous silica lcsh:QH301-705.5 Instrumentation Fluid Flow and Transfer Processes lcsh:T ecotoxicity Chemistry Process Chemistry and Technology General Engineering Mesoporous silica microemulsion 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Computer Science Applications lcsh:Biology (General) lcsh:QD1-999 Chemical engineering lcsh:TA1-2040 13. Climate action encapsulation lcsh:Engineering (General). Civil engineering (General) cationic surfactants 0210 nano-technology Mesoporous material lcsh:Physics |
| Zdroj: | """Applied Science, Special Issue """"Green Nanotechnology: The Latest Innovations, Knowledge Gaps, and Future Perspectives""""""" Applied Sciences Volume 10 Issue 22 Applied Sciences, Vol 10, Iss 8085, p 8085 (2020) |
| ISSN: | 2076-3417 |
| DOI: | 10.3390/app10228085 |
| Popis: | Silica mesoporous nanocapsules are a class of &ldquo smart&rdquo engineered nanomaterials (ENMs) applied in several fields. Recent studies have highlighted that they can exert deleterious effects into marine organisms, attributed to the use of the toxic cationic surfactant N-hexadecyl-N,N,N-trimethylammonium bromide (CTAB) during the synthesis of ENMs. The present study reports the successful synthesis and characterization of novel gemini surfactant-based silica nanocapsules. The gemini surfactant 1,4-bis-[N-(1-dodecyl)-N,N-dimethylammoniummethyl]benzene dibromide (QSB2-12) was chosen as a more environmentally-friendly replacement of CTAB. Nanocapsules were characterized by scanning electron microscopy (SEM), Fourier-transformed infrared spectroscopy (FTIR), dynamic light scattering (DLS), thermogravimetric analysis (TGA) and N2 adsorption-desorption isotherms. Short-term exposure effects of new ENMs were evaluated in four marine species (Nannochloropsis gaditana, Tetraselmis chuii and Phaeodactylum tricornutum) and the microcrustacean (Artemia salina). The replacement of the commercial cationic surfactant by the gemini surfactant does not change the structure nor the environmental behaviour in seawater of the newly synthesised silica nanocontainers. Additionally, it is demonstrated that using gemini surfactants can reduce the toxicity of novel silica nanocapsules towards the tested marine species. As a result, environmentally-friendly ENMs can be obtained based on a safe-by-design approach, thereby fitting the concept of Green Chemistry. |
| Databáze: | OpenAIRE |
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