Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses
<abstract language="eng">Theoretical and practical aspects of the use of microwave-assisted strategies in chemistry are introduced for students using simple and safe experiments employing a domestic oven. Three procedures are proposed for evaluating the distribution of microwave radi...
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| Format: | Article |
| Language: | English |
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Sociedade Brasileira de Química
2004-12-01
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| Series: | Química Nova |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000600028 |
| _version_ | 1811218142824759296 |
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| author | Fabiana Rosini Clésia C. Nascentes Joaquim A. Nóbrega |
| author_facet | Fabiana Rosini Clésia C. Nascentes Joaquim A. Nóbrega |
| author_sort | Fabiana Rosini |
| collection | DOAJ |
| description | <abstract language="eng">Theoretical and practical aspects of the use of microwave-assisted strategies in chemistry are introduced for students using simple and safe experiments employing a domestic oven. Three procedures are proposed for evaluating the distribution of microwave radiation inside the microwave oven cavity: (1) variation of the volume of marshmallows; (2) drying of filter paper wetted with Co(II) solution, and (3) variation of water temperature, after microwave-assisted heating. These experiments establish the position with the highest incidence of microwave radiation in the oven cavity, which was chosen for the synthesis of salicylic acid acetate. This synthesis was performed in 5 min of heating and the yield was around 85%. All experiments can be carried out in a 4 h lab-session using low-cost instrumentation. |
| first_indexed | 2024-04-12T07:04:29Z |
| format | Article |
| id | doaj.art-262913d5f5624835ba55ceddabb34d79 |
| institution | Directory Open Access Journal |
| issn | 0100-4042 1678-7064 |
| language | English |
| last_indexed | 2024-04-12T07:04:29Z |
| publishDate | 2004-12-01 |
| publisher | Sociedade Brasileira de Química |
| record_format | Article |
| series | Química Nova |
| spelling | doaj.art-262913d5f5624835ba55ceddabb34d792022-12-22T03:42:51ZengSociedade Brasileira de QuímicaQuímica Nova0100-40421678-70642004-12-012761012101510.1590/S0100-40422004000600028Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate coursesFabiana RosiniClésia C. NascentesJoaquim A. Nóbrega<abstract language="eng">Theoretical and practical aspects of the use of microwave-assisted strategies in chemistry are introduced for students using simple and safe experiments employing a domestic oven. Three procedures are proposed for evaluating the distribution of microwave radiation inside the microwave oven cavity: (1) variation of the volume of marshmallows; (2) drying of filter paper wetted with Co(II) solution, and (3) variation of water temperature, after microwave-assisted heating. These experiments establish the position with the highest incidence of microwave radiation in the oven cavity, which was chosen for the synthesis of salicylic acid acetate. This synthesis was performed in 5 min of heating and the yield was around 85%. All experiments can be carried out in a 4 h lab-session using low-cost instrumentation.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000600028microwave radiation distributionmicrowave-assisted synthesissalicylic acid acetate |
| spellingShingle | Fabiana Rosini Clésia C. Nascentes Joaquim A. Nóbrega Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses Química Nova microwave radiation distribution microwave-assisted synthesis salicylic acid acetate |
| title | Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses |
| title_full | Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses |
| title_fullStr | Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses |
| title_full_unstemmed | Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses |
| title_short | Experimentos didáticos envolvendo radiação microondas Microwave-assisted experiments for undergraduate courses |
| title_sort | experimentos didaticos envolvendo radiacao microondas microwave assisted experiments for undergraduate courses |
| topic | microwave radiation distribution microwave-assisted synthesis salicylic acid acetate |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422004000600028 |
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