рабочий лист Исследование магнитных жидкостей.docx
Magic Magnetic Fluid
Liquid Magnets Worksheet
materials fall into three categories of magnetic materials: paramagnetic, diamagnetic
and ferromagnetic. Amongst these categories, ferromagnetic materials exhibit
the largest magnetic permeability. As the name suggests ferrofluids are
composed of ferromagnetic particles, surfactant, and carrier fluid. Ferromagnetic
particles are used because of its large magnetic permeability as compared to
other classifications of magnets. Essentially, the resultant magnetic field is
orders of magnitude larger than the induced magnetic field. This becomes
important when manipulating ferrofluids under moderate and controlled magnetic
engineers, you are the material scientist manipulating your own ferrofluid.
Your challenge is to become exceptional observers and document everything you
see. Use your observation skills and newly found knowledge of ferrofluids to
complete the handout.
2.What type of magnetic
material (paramagnetic, diamagnetic, or ferromagnetic) would be best for making
a liquid magnet? Explain the fundamental differences between the three
classifications of magnets and why you would use one over the other.
3.The picture below
depicts what is going on in your test tube. Although you cannot see the
particles, they are there. Fill in the three spaces in the magnified picture.
Below the picture write the purpose of each labeled component.
permanent magnet under clear plastic dish and pour a small amount of fluid over
the plastic area that the magnet occupies beneath and outside the dish.
drops of red food coloring and mix using the magnet, located outside the dish.
hands, manipulate the magnet, outside the dish, and fluid (blood) making squares,
triangles and circles. Remove the magnet from under the plastic dish, and
observe how the fluid behaves. Fairly quickly, place the magnet back under the
dish, and observe how the fluid behaves
magnet outside the dish and under the fluid, as above, and begin touching fluid
with a latex glove. Can you spin your fluid?
plastic dish by wiping magnetic fluid up with paper towels. Make sure no fluid
residue is present on dish.
boxes below, draw your observations of the ferrofluid when exposed to the
external magnet and when not exposed.
would you describe the ferrofluid when it is NOT exposed to an external magnet?