Magnetic Fluids Experiment - Student

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* 1. Please identify the school where you performed the Magnetic Fluids experiment:

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* 2. In what grade are you currently enrolled?

8th grade or younger

9th

10th

11th

12th

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* 3. After performing this hands-on activity, please rate how well you understand the following concepts:

	Not at all	A little	Mostly	Very
When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution.	When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. Not at all	When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. A little	When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. Mostly	When the sizes of magnetic particles are sufficiently small (approx. 10nm, i.e. nanoparticles), they become single tiny magnets, align to the vector direction of a magnetic field, and are affected by the force from the magnetic field, hence forming a magnetic fluid in a solution. Very
To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties.	To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. Not at all	To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. A little	To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. Mostly	To create one unit of magnetic nanoparticle (Fe2O3), we must provide the exact stoichiometric ratio of two units of FeCl3 and one unit of FeCl2. Incorrect concentrations in our redox reaction will produce other type of nanoparticles that do not have the desirable magnetic properties. Very
Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers.	Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Not at all	Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. A little	Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Mostly	Solid materials can be dispersed in the colloidal suspension if their sizes are very small, on the order of ten nanometers. Very

Please offer your explanation to the following questions:

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* 4. What happens to the magnetic nanoparticles in the solution if their size become too big (larger than 100 nm)? Explain your answer:

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* 5. The solutions you have in the beginning of the activity were FeCl2, FeCl3, and ammonia. From where did the magnetic nanoparticles (Fe2O3) come from? Identifying or naming the chemical reaction is acceptable.

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* 6. What is the role of the hexane in this experiment?

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* 7. In this experiment, NH3 is used to start the nucleation process around where the Fe2O3 atoms form and grow into a nanoparticle of approx. 10 nm size. Raining, or forming water droplets from gaseous water molecules (humidity), also involves a nucleation process. Please suggest what in the atmosphere might be equivalent to NH3, a nucleation center around which water droplets form and initiate rainfall.

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* 8. Identify any concepts that you might have better understood after performing this activity:

None

Nanoparticles

Magnetism

Oxidation-Reduction

Material Synthesis

Other (please specify)

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* 9. On a scale from 1 to 4, where 1 means "not at all" and 4 means "very much," rate the following

	1	2	3	4
Did you find the science you learned in this activity interesting?	Did you find the science you learned in this activity interesting? 1	Did you find the science you learned in this activity interesting? 2	Did you find the science you learned in this activity interesting? 3	Did you find the science you learned in this activity interesting? 4
Do you want to learn more about how to modify material properties?	Do you want to learn more about how to modify material properties? 1	Do you want to learn more about how to modify material properties? 2	Do you want to learn more about how to modify material properties? 3	Do you want to learn more about how to modify material properties? 4
How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)?	How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 1	How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 2	How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 3	How well can you explain what a magnetic fluid is to someone who doesn’t know (perhaps a younger sibling)? 4