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Sedimentation Equilibrium of Mixtures of Charged Colloids

Sedimentation Equilibrium of Mixtures of Charged Colloids

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and try to fill the holes, or try to solve for n 3 regions, where each density istreated seperately, for example.4.6.6 The colloidal Brazil nut effectReaders that do not like informal language can skip this section and go tothe next.Why?Because <strong>of</strong> you, and the poor farmer with his heavy cargo.What farmer? Where?Somewhere far from here. He was a happy, but poor man. No time he hadto enjoy the summer, to smell the lovely spring. He had to work all day aslong as the sun gave him its light. And when he went to sleep, he dreamt <strong>of</strong>nuts, huge bags, loads, storehouses, seas and oceans <strong>of</strong> nuts! That’s what hegrew. . .Now he is on his way to the market. His cart can sure use some new loyalwheels, that aren’t weary <strong>of</strong> the bumpy road. With the help <strong>of</strong> six smallhands, the load is freed from its last ditch and reaches the market. Lo! Fromthe opened bags, a wonder clouds the place. ”What happened?!” the farmershouts ”My nuts, they’ve grown! No wait! They’ve moved! They put themselvesinto order! The biggest first, the smallest last, and smaller follow thebigger!”. With shaking knees he does not know whom to thank. It wasn’tMother Earth, she likes the opposite order. It was certainly not Entropius,he likes no order at all. And the nuts themselves. . .That day he did not sell his famous ’mixed-nuts’, and began to think aboutthe miracle. He decided to buy a large coat from the money he just earned,the biggest he could find. He put it on and stuffed it with bags <strong>of</strong> hay andfeathers, until it fitted. His daily work was terrible with all these clothes,and the sun made it even worse. He took a rest in the shadow <strong>of</strong> a tree.”Good Gracious, you are sweaty, sir!” a well-mannered traveller said ”Areyou alright? Please take something to drink, and join me in this carriage. Icannot let you walk any further.” And so they went to the city. The farmerdrank something he didn’t know but still felt hot. The holes in the roadseemed to dear him far less than the well-mannered traveller. When theyreached the city, the poor traveller asked the carriage to halt for a minuteand ran into a hotel. The farmer did not hesitate to take a breath. ”Are youhere for the conference?” a man with golden ropes and stripes asked him.”Is it shady there?” the farmer asked back. The man with the golden stripeslaughed and said:”Follow me, sir.” The farmer entered a huge hall with chandeliers,champagne, chatting men with clothes he’d never seen before, there40

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