Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer

The study of gels and their properties is a compelling topic both technologically and scientifically, and should therefore be emphasized in chemistry and material science syllabuses. In the present laboratory experiment, we propose two experiences, aimed at introducing gelation and gel transport pro...

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Autores principales: Calcabrini, M., Onna, D.
Formato: JOUR
Materias:
First-Year Undergraduate/General
Hands-On Learning/Manipulatives
Materials Science
Physical Chemistry
Second-Year Undergraduate
Transport Properties
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_00219584_v96_n1_p116_Calcabrini
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_00219584_v96_n1_p116_Calcabrini
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spelling todo:paper_00219584_v96_n1_p116_Calcabrini2023-10-03T14:23:51Z Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer Calcabrini, M. Onna, D. First-Year Undergraduate/General Hands-On Learning/Manipulatives Materials Science Physical Chemistry Second-Year Undergraduate Transport Properties The study of gels and their properties is a compelling topic both technologically and scientifically, and should therefore be emphasized in chemistry and material science syllabuses. In the present laboratory experiment, we propose two experiences, aimed at introducing gelation and gel transport properties using silica gels made from sodium silicate and sodium citrate buffer. In particular, gelation times are used to teach kinetics and optical properties to first and second year General Chemistry students. Gelation times are determined by measuring the increment in scattering intensity with a 3D-printed spectrophotometer. The gel transport properties are presented to further exemplify Fickian and non-Fickian behavior through ionic dyes diffusing in gels. A qualitative description is obtained from charge interactions, and a quantitative description utilizing the diffusion coefficient is achieved by analyzing absorbance profiles. These tasks were designed to encourage students to work with unusual topics in a holistic way, approaching new materials, properties, and DIY equipment. Blueprints for the spectrophotometer, resources for instructors, and a detailed students' guide are provided together with a short report model to promote critical discussion of the observations. © 2018 American Chemical Society and Division of Chemical Education, Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00219584_v96_n1_p116_Calcabrini
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic First-Year Undergraduate/General
Hands-On Learning/Manipulatives
Materials Science
Physical Chemistry
Second-Year Undergraduate
Transport Properties
spellingShingle First-Year Undergraduate/General
Hands-On Learning/Manipulatives
Materials Science
Physical Chemistry
Second-Year Undergraduate
Transport Properties
Calcabrini, M.
Onna, D.
Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
topic_facet First-Year Undergraduate/General
Hands-On Learning/Manipulatives
Materials Science
Physical Chemistry
Second-Year Undergraduate
Transport Properties
description The study of gels and their properties is a compelling topic both technologically and scientifically, and should therefore be emphasized in chemistry and material science syllabuses. In the present laboratory experiment, we propose two experiences, aimed at introducing gelation and gel transport properties using silica gels made from sodium silicate and sodium citrate buffer. In particular, gelation times are used to teach kinetics and optical properties to first and second year General Chemistry students. Gelation times are determined by measuring the increment in scattering intensity with a 3D-printed spectrophotometer. The gel transport properties are presented to further exemplify Fickian and non-Fickian behavior through ionic dyes diffusing in gels. A qualitative description is obtained from charge interactions, and a quantitative description utilizing the diffusion coefficient is achieved by analyzing absorbance profiles. These tasks were designed to encourage students to work with unusual topics in a holistic way, approaching new materials, properties, and DIY equipment. Blueprints for the spectrophotometer, resources for instructors, and a detailed students' guide are provided together with a short report model to promote critical discussion of the observations. © 2018 American Chemical Society and Division of Chemical Education, Inc.
format JOUR
author Calcabrini, M.
Onna, D.
author_facet Calcabrini, M.
Onna, D.
author_sort Calcabrini, M.
title Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
title_short Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
title_full Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
title_fullStr Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
title_full_unstemmed Exploring the Gel State: Optical Determination of Gelation Times and Transport Properties of Gels with an Inexpensive 3D-Printed Spectrophotometer
title_sort exploring the gel state: optical determination of gelation times and transport properties of gels with an inexpensive 3d-printed spectrophotometer
url http://hdl.handle.net/20.500.12110/paper_00219584_v96_n1_p116_Calcabrini
work_keys_str_mv AT calcabrinim exploringthegelstateopticaldeterminationofgelationtimesandtransportpropertiesofgelswithaninexpensive3dprintedspectrophotometer
AT onnad exploringthegelstateopticaldeterminationofgelationtimesandtransportpropertiesofgelswithaninexpensive3dprintedspectrophotometer
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