Erasmus+ 1 | Page 70

Physical Materials Properties – workshop I

• Dividing the students into 3 groups (15 mins)

•Survey - (15 mins)

•Workshop-(60 mins)

•Survey - (15 mins)

Tasks – group A

1)Worksheet A1-material gentleness

Study the gentleness and smoothness of 3 various materials by measuring their area weights.

Measure the sizes of particular samples by the mean of a ruler and then state their weight by the mean of digital scales. Calculate the area weight as the weight per 1cm2.

2)Worksheet A2-artificial fibres

Decide which of the artificial materials is the most suitable for the production of artificial fibres. Heat particular samples in small aluminium foil bowls and then try to create the longest fibre by the mean of a wooden pick. Record your observations in a table and deduct which material is the most suitable one.

Tasks– group B

1)Worksheet B1-hydrophobic properties

Study hydrophobic properties of different materials and write down the purposes the particular materials are used for. Drop three different liquids on the particular samples and after 30sec describe the size and the shape of the drop (make a sketch). According to the size decide the absorption quality of every single material (good, poor, no).

2)Worksheet B2-hair thickness

Measure the thickness of your hair by the mean of laser.

Based on the light defraction on small obstacles you can measure the width of the obstacle, which in this case is your hair. Spot the hair with laser and observe the light track on the shade.

Measure the distance of the interferrence maxima and calculate the thickness of your hair. Compare the thickness os the hair and different material fibres.

Tasks– group C

1)Worksheet C1-absorbing power

Measure absorbing power of given materials. First measure the weight of the material before the measurement. Then, soak the sample in water and leave it soaked for 1 min.

After that take it out and leave it drop off for 2minutes and measure the weight again not having squeezed it. Use the gained data to state the percentage of absorbing power of the materials proven

2)Worksheet C2-nanospider technology

Make a fibre thinner than a hair by he means of a special method „nanospider“, which was patented in the Czech Republic. The technology was invented by prof.Jirsak at the Textile University of Liberec in 2003.

Making the experiment follow this scheme: Wimhurst induction electricity, solution, lantern, a sheet of black sturdy paper. Generation of electric power implies making a thin layer of the solution on the sturdy paper.

Observe the proces of its origination and draw a sketch of the originated phenomenon. Deduct the differences in the properties of the sturdy paper surface without nanopolymers and with nanopolymers.

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