Is it possible to simulate the fluid mosaic model using a soap solution?
Background:Soap bubbles are a great substitute for cell membranes, as they are fluid, flexible, and can self-repair. Bubbles and cell membranes are much alike because their parts are so similar. Zooming in on a cell membrane you would see that much of the membrane is a double layer of small molecules called Phospholipids. Phospholipids have a very mixed relationship with water, as it is made up by two parts. One hydrophobic, and one hydrophilic. On one end of the Phospholipids we have two hydrophobic tails. Hydrophobic means ´Water hating´, which means that the tails will search away from the water. The other part, the hydrophilic head is ´water loving´, which means that the head is attracted to the water. If you place the phospholipids in water, they quickly form a double layer with the heads facing out on both sides.Soap molecules has the same split personality. On one hand, the head of the molecule is charged, and attracts to water molecules, which have regions of positive and negative charge. On the other hand, the hydrocarbon tail of the molecule is not charged and is therefore repelled by the water’s polarity. This also explains why we use soap to clean. The hydrocarbon tail of soap mixes and dissolves in other hydrocarbons, like oils and fats, while the head grabs a hold of passing water molecules and follows them down the drain. The surface of a bubble has three layers, the middle layer being a thin film of water. On both sides of the water is a layer of soap molecules with the hydrophilic heads pointing outwards and the hydrophobic tails pointing the opposite way.
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