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  • Here’s a relatively simple method to make ferrofluid, a very interesting liquid that responds to magnetic fields. You’ll need the following chemicals:

    20mL 1.5M FeCl3 solution
    10mL 1.5M FeCl2 solution
    150mL Household Ammonia
    5mL Oleic Acid
    100mL Kerosene

    My iron chlorides probably weren’t precisely as listed above, because I made them by dissolving iron in HCl (see my other video here: ). What you want to shoot for is a 2:1 ratio of FeCl3:FeCl2.

    Ferrofluids consist of 3 parts: a magnetically responsive material, a surfactant, and a carrier fluid. The surfactant serves to suspend the magnetic material and keep it from clumping together. Here, our material is magnetite, the surfactant is oleic acid, and the carrier fluid is kerosene.

    First, we will make the magnetically active material. Mix the two iron chlorides together, and pour the mixture into 150mL of household ammonia solution. This initiates a complex reaction that produces tiny particles of magnetite, Fe3O4, in ammonium chloride solution.

    Next, we will coat the material in the surfactant. Take the solution outside or in a fume hood, and heat it to near boiling. Then add 5mL of oleic acid with lots of stirring, and continue to heat until the smell of ammonia disappears. This usually takes about an hour – swirl the solution often to keep the magnetite suspended and to let the oleic acid attach to it completely. The acid initially reacts with the ammonia to form ammonium oleate, a slightly soluble soap. Additional heating decomposes this to ammonia gas, which escapes, and oleate ions, which attach to and surround the magnetite particles.

    Now, we need to suspend our oleic acid-coated magnetite in a carrier fluid. Keep your solution outside, let it cool, and add in 100mL of kerosene. Stir this up a bit (but NOT with a magnetic stirrer :) ). Oleic acid is insoluble in water, but is soluble in kerosene. With stirring, it will migrate into the kerosene layer and stay there, taking its attached magnetite with it. You’ll end up with a black layer of liquid on top of a clear layer of water. This black layer can be decanted off, and is your finished product of ferrofluid!

    Because it’s mostly kerosene, this stuff smells and will stain things very easily. For display, it’s neat to put a small amount in a bottle or vial, perhaps filled with water so that the residue doesn’t stick to the sides. Bring a magnet nearby and watch it follow it!

    Hope you enjoyed the video and found it instructive. Let me know in the comments!

    My source for this experiment was

    Junker offers the wildest roller coaster ride in Northern Europe. It blows away the passengers from 0-100 km/h in only 1.9 seconds. Compare that to a F1 car, for which it takes over two seconds to reach the same speed. After the initial acceleration, Junker defies gravity with a 40 metre vertical climb over the Ostrobothnian plains. However, what goes up, must come down: Junker then dives with a top speed of 100 km/h through two loops and the pond beneath, straight into a tunnel under the pond – only to return again swiftly from the underworld. This extremely fast ride is 860 metres long and its passengers will experience G-forces up to 4.5 G.
    Junker tests you with G-forces of up to 4.5 G. As a special treat you will be taken into a tunnel through and under a pond. Once the tunnel is left behind Junker returns to daylight and takes you through loops and bends of numerous directions. And then it all ends with an impressive sudden stop – made possible with super strong magnets.
    No one leaves Junker untouched. No matter how seasoned you are when it comes to wild rides, Junker will get the best of you. Safety limit: 130 cm. Children between 8-10 accompanied by a +130 cm adult.

    More videos from Powerpark here:

    Length: 860 meters
    Height: 40 meters
    Inversions: 3
    Speed: 100 km/h
    G-Force: 4.5
    Max Acceleration: 0 – 100 km/h in 1.9s

    Pohjois-Euroopan hurjin vuoristorata Junker kiihdyttää matkustajat 0-100 km/t huippunopeuteen vain 1,9 sekunnissa. Junker kiihtyy nopeammin kuin F1-auto, joka tarvitsee kiihtyäkseen samaan nopeuteen reilut kaksi sekuntia.
    Alkukiihdytyksen jälkeen noustaan maan vetovoimaa uhmaten lähes pystysuoraan 40 metrin korkeuteen Etelä-Pohjanmaan lakeuksien ylle. Korkeuksista syöksytään 100 km/t huippunopeudella parin silmukan kautta suoraan alapuolella olevan lammen läpi tunneliin maan alle ja sieltä jälleen ylös. Huippunopealla radalla on mittaa 860 metriä ja parhaimmillaan koetaan jopa 4,5 G:n voimat.
    4,5 G:n voimilla kyytiläisiä koetteleva Junkerin erikoisuus on lammen alle vievä tunneli. Huippunopeudella lammen läpi kulkevasta tunnelista Junker nousee uudelleen päivänvaloon ja tekee silmukoita ja kierteitä moneen suuntaan. Lopussa säväyttää vaikuttava pysähtyminen huipputehokkaitten magneettien avulla.
    Junkerin kyyti ei todellakaan jätä ketään kylmäksi oli kyseessä kuinka huimapäinen vuoristoratojen valloittaja hyvänsä.
    Turvaraja 130cm. 8-10 vuotiaat, yli 130cm aikuisen kanssa.

    PowerPark Adventure Park – Huvivaltio PowerPark:

    Finland’s most special amusement park, one of the world’s most beautiful go-kart tracks, the biggest go-kart indoor hall in Europe, Mediterranian-style hotel, idyllic cabins, horse centre with its lovely four-legged companions, high-quality restaurants, cosy camping area, Wonderland and Finland’s first 5D-movie theatre guarantee unforgettable experiences all year round.
    The idea of building an amusement park with international atmosphere in the middle of Southern Ostrobothnian countryside – something very unique in Finland – had been Jorma Lillbacka’s dream and vision for long. Finally, in 2000, a long-standing dream fulfilled, when Mika Salo Circuit, a go-kart track with international standards, opened by the river in Alahärmä, in Lillbacka’s home town.
    In the early 2000s the need for accommodation became quickly apparent and a gorgeous hotel and a high-quality restaurant were built next to the go-kart track. In 2003 the dream of building a real adventure park came true, when the first amusement rides were built at the park. PowerPark is most of all a park with roller coasters.
    The themes in the amusement park will take the guests all the way from American Wild West to Tyrolean atmosphere and to the narrow alleys of Italian small towns.

    Pohjanmaan Alahärmässä keskellä tarunhohtoisia lakeuksia kohoaa Suomen suurin ja erikoisin vapaa-ajankeskus PowerPark. 160 hehtaaria ikärajatonta riemua, vauhtia, elämyksiä ja aktiviteetteja. PowerParkin sydän on mielikuvituksellinen huvipuisto, jonka lisäksi tarjolla roppakaupalla muuta hauskaa tekemistä, kokemista, majoitusvaihtoehtoja, tapahtumia ja ostosmahdollisuuksia.

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    Rollercoaster Finland is an fun channel, dedicated to amusement parks, rides and of course rollercoasters!
    Enjoy our videos, share them and please subscribe!