Preparation of Hydrophobic Surface of Stearic Acid Encapsulated Calcium Carbonate
Hydrophobic surfaces are actively investigated due to their potential for various technological applications. Synthesis of hydrophobic surface here is aimed at attempting the usage of relatively cheap and non-toxic materials from the local market. Calcium carbonate powder and stearic acid are com...
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| Format: | Final Project |
| Language: | Indonesia |
| Subjects: | |
| Online Access: | https://digilib.itb.ac.id/gdl/view/40817 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Hydrophobic surfaces are actively investigated due to their potential for various
technological applications. Synthesis of hydrophobic surface here is aimed at
attempting the usage of relatively cheap and non-toxic materials from the local market.
Calcium carbonate powder and stearic acid are commonly available in the local market
and a good candidate for developing hydrophobic surfaces. Calcium carbonate can
enhance the surface roughness, while stearic acid reduces the surface energy.
The development of hydrophobic surface was conducted by blending calcium carbonate
powder into stearic acid solutions. Ethanol and hexane is used as a solvent to prepare
stearic acid solution with various concentrations. 10 gram of calcium carbonate powder
is poured into 25 mL stearic acid solution while stirring on a heated plate at 50°C for 30
minutes, followd by cooling and drying. The stearic acid encapsulated calcium
carbonate powders was spread onto the surface of adhesive tape. Hydrophobic
properties was characterized by observing the contact angle between a 5?L water
droplet and the covered tape surface of stearic acid encapsulated calcium carbonate,
and their stability against elapsed time. It is found that the maximum contact angle of
149° and 147° is achieved for the powder developed by using 2% weight stearic acid
for hexane and ethanol, respectively. The stability of a water droplet on the
hydrophobic surface lasted about 115 minutes, and the contact angle has decreased
30% after 2 hours of elapsed time. The usage of acrylic resin as a binder has reduced
the contact angle due to the lack of surface roughness.
Keywords: hydrophobic, calcium carbonate, stearic acid, acrylic resin, contact angle |
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