Tuesday, June 7, 2011
Nanotechnology help to save time, space and effort. It brings convenience to everyone and help to save life even from bullet and even terrorism.
Animation requires a lot of hard work, creativity and labour. In recent years, stop motion, 2d and 3d animations bring in different varieties of fascinating animations.
Sea level rise would not be the same for all places and it is hard to measure the melting of glaciers.
The plenary session that leaves the deepest impression on me is Biomedical Engineering and Technology. What I like about it is that it can save life as it can help to protect oneself from enemies as it help to camouflage and protect from bullets.
Importance of water - dirty and clean
We must save water and appreciate it and not take it for granted as there are people in the world who do not have access to clean drinking water and fall sick very easily.
Revolution of Microelectronics Technology
Electronics can be integrated to form better technology like bionano electronics.
Biomedical engineering and technology
Reducing size for a fixed volume to get a larger surface area to have more energy.
IT for Animation
Animation is a painstaking process that needs lots of labour to create frames and animate them.
Disappearing glaciers, rising sea levels, gravity being important
When a glacier melts, the land will pop up, so the sea level near the glacier will decrease while the sea level far away from the glacier will rise.
The plenary session that gives me the deepest impression is the one about glaciers, and rising sea levels. This is a problem as it concerns the environment. If the glaciers keep melting, the sea level far away will keep on rising, and tide will rise and causing some islands to be submerged. This will be a major problem for people in the future.
Sunday, June 5, 2011
Partition Coefficient (K) = Cs/Cg
where Cs is the concentration of analyte in sample phase;
Cg is the concentration of analyte in gas phase
In general, an organic compound and an inorganic salt can be easily separated using these solubility differences. We can tell which phase is aqueous and which is organic by checking the density of the liquids. Swirling the separatory funnel is a better technique to mix the liquids. The rotary evaporator is used to evaporate the solvent that your chemical compound of interest is solubilized in.
We must ensure that the filtrate(filtrated liquid) is in room temperature as caffeine is more soluble in dichloromethane than water. Remember to place a Stopper to the separating funnel and gently invert it. You must not shake it too vigorously.
Tuesday, May 31, 2011
This project is to extract caffeine from drinks. So these are important things to take note:
Acidic: something with pH value of less than 7. 1 or 2 is considered strong.
Alkaline:Something with pH value of more than 7. 13 or 4 is strong.
solubility : It is the ability of a substance to dissolve in a liquid, for example, salt dissolving in water to get salt solution.
polar solvent : The angle of which the molecules of compounds come together is around 105 degrees, making it like a triangle. Example will be water and it can only dissolve other polar substances. This is why oil cannot be dissolve in water but salt can.
non-polar solvent: The way the molecules of a compound come together is like a circle with one type of molecule in the interior and another in the exterior. An example would be oil and gasoline. It can only dissolve other non polar substances and not polar substances.
Hydrophobic: Meaning that the substance cannot be dissolved in water.
Hydrophilic: Meaning that this substance can be dissolved in water very well.
Separating funnel: This is a tool used to separate liquids that cannot be dissolved, like oil and water. After pouring the mixture in and shaking, allow it to settle and it will form 2 separate layers of liquid, based on density, like the less dense one on top and the more dense one below, in this case, water below and oil on top. You can then open the tap below and allow the water to flow into a beaker, then close the tap and open again to allow the oil to flow into another beaker.
Buchner filtration: It is to reduce the pressure of the surrounding for a solid to be easily extracted from a liquid. The solid will be trap in the filter while the liquid will flow into a flask below.
It is different from regular filtration with filter paper as it will take a longer time, while Buchner filtration is faster.
By: Brendon Goh