Partner Resource
Just Like Kidneys: Semipermeable Membrane Prototypes
Just Like Kidneys: Semipermeable Membrane Prototypes
https://www.teachengineering.org/activities/view/nds-1731-semipermeable-membrane-prototypes-kidney-dialysis

PostedThursday, March 8, 2018 at 2:54 PM

Updated03/12/2018

Using ordinary household materials, student “biomedical engineering” teams design prototype models that demonstrate semipermeability under the hypothetical scenario that they are creating a teaching tool for medical students. Working within material constraints, each model consists of two layers of a medium separated by material acting as the membrane.

The competing groups must each demonstrate how water (or another substance) passes through the first layer of the medium, through the membrane, and into the second layer of the medium. After a few test/evaluate/redesign cycles, teams present their best prototypes to the rest of the class. Then student teams collaborate as a class to create one optimal design that reflects what they learned from the group design successes and failures. A pre/post-quiz, worksheet and rubric are provided.

Using ordinary household materials, student “biomedical engineering” teams design prototype models that demonstrate semipermeability under the hypothetical scenario that they are creating a teaching tool for medical students. Working within material constraints, each model consists of two layers of a medium separated by material acting as the membrane.

The competing groups must each demonstrate how water (or another substance) passes through the first layer of the medium, through the membrane, and into the second layer of the medium. After a few test/evaluate/redesign cycles, teams present their best prototypes to the rest of the class. Then student teams collaborate as a class to create one optimal design that reflects what they learned from the group design successes and failures. A pre/post-quiz, worksheet and rubric are provided.

Read More
Sort By
  • Posted Sunday, November 4, 2018 at 6:46 PM
    Not So Permeable Membranes
    While I like the idea of demonstrating a semipermeable membrane, I think the project should include a solution that is separated by the membrane. For instance, adding grains of sand. This would show the selectivity of the membrane. Additionally, the materials listed for the membrane were quite difficult to permeate. I think a selection of materials that better allow the solution to pass through is necessary. Some of my students could not get even one drop of solution through the membrane!
    0 Comments
    Please Login or Register to post a comment or Like an existing one.
    {{settings.nrChars}}/ {{settings.maxChars}} chars