ERIC Number: EJ1033283
Record Type: Journal
Publication Date: 2014-Jul
Abstractor: As Provided
Reference Count: 28
Tangential Flow Filtration of Colloidal Silver Nanoparticles: A "Green" Laboratory Experiment for Chemistry and Engineering Students
Dorney, Kevin M.; Baker, Joshua D.; Edwards, Michelle L.; Kanel, Sushil R.; O'Malley, Matthew; Pavel Sizemore, Ioana E.
Journal of Chemical Education, v91 n7 p1044-1049 2014
Numerous nanoparticle (NP) fabrication methodologies employ "bottom-up" syntheses, which may result in heterogeneous mixtures of NPs or may require toxic capping agents to reduce NP polydispersity. Tangential flow filtration (TFF) is an alternative "green" technique for the purification, concentration, and size-selection of polydisperse NP suspensions or colloids, in that it allows for real-time analysis and reduces the usage of additional solvent and post-synthetic reagents. Upper-division undergraduate and graduate students in engineering and chemistry successfully applied a three-step TFF process to reduce the polydispersity of Creighton colloidal silver nanoparticles (AgNPs). UV-vis absorption spectroscopy in conjunction with the Lambert-Beer law and Mie's solutions to the Maxwell equations were employed to rapidly estimate the concentration and size of nanosilver in each TFF-fractionated colloidal sample using the localized surface plasmon resonance (LSPR) of AgNPs. A thorough emphasis on "green" nanochemistry and its underlying principles were also provided to educate the next generation of environmentally conscious nanochemists and nanoengineers for the ever-expanding nanosectors. The overall laboratory experience was perceived as intellectually stimulating and was highly rated in the student evaluations. This interdisciplinary experiment may be implemented in various nanotechnology, physical, or analytical courses.
Descriptors: Science Instruction, Science Laboratories, Chemistry, Engineering Education, College Science, Undergraduate Students, Graduate Students, Spectroscopy, Equations (Mathematics), Conservation (Environment), Science Experiments, Laboratory Experiments
Division of Chemical Education, Inc and ACS Publications Division of the American Chemical Society. 1155 Sixteenth Street NW, Washington, DC 20036. Tel: 800-227-5558; Tel: 202-872-4600; e-mail: email@example.com; Web site: http://pubs.acs.org/jchemeduc
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education; Postsecondary Education
Authoring Institution: N/A