mmmerlin at hotmail.com
Mon May 23 12:03:23 UTC 2011
Yes, I've been fantasising about making some ferro-fluid sculptures for a while now. From what I've read, it seems to be that you can indeed buy ferro-fluid much cheaper than $1/ml but that the cheaper stuff, whilst it does respond to magnetic fields, it doesn't make the beautiful spikes etc that you think of when someone says ferro-fluid - that stuff is the $1000/litre stuff. However, this certainly doesn't mean that it shouldn't be tried!
The cornflour and water speaker thing was indeed knocked-up very quickly and will be done with a lot more scientific method next time! As well as a better flour/water ratio I will make a speaker cone designed to be able to hold the mixture directly and thus remove the vibration damping that the plastic bag provided. Hopefully this should mean that we will able to work out which amplitudes and frequencies get which of the many cool effects that can be got with setup.
As for the boiling off of ammonia, it certainly does sounds both a lot easier and more sensible to do it outside on a hotplate that to build a fume cupboard!
Anyway, looking forward to coming back on Thursday, see you all there.
> From: chocojon at blueyonder.co.uk
> To: hackspacebristol at lists.aktivix.org
> Date: Mon, 23 May 2011 10:47:30 +0100
> Subject: Re: [hackspacebristol] Ferrofluid
> Regrettably, I find things to build / links on the Internet and not worry
> too much about the details. I don't have a fume cupboard but I think we
> could build one with the stuff around Hackspace. I'm thinking Perspex front,
> wooden walls, stove heater type thing, big fan and a fair bit of ingenuity.
> The reason for the link was that some new people arrived on the last
> Hackspace and expressed an interest in making something with Ferrofluid (if
> I remember correctly). Something along these lines:
> One thing that the new people did organise was cornflour and water on a
> loudspeaker cone to look something like this:
> Didn't work optimally but it was pretty close to that considering the speed
> with which it was made.
> > -----Original Message-----
> > From: hackspacebristol-bounces at lists.aktivix.org [mailto:hackspacebristol-
> > bounces at lists.aktivix.org] On Behalf Of Richard Sewell
> > Sent: 23 May 2011 09:11
> > To: hackspacebristol at lists.aktivix.org
> > Subject: Re: [hackspacebristol] Ferrofluid
> > Jon - that looks both cheap and easy. If it works we should be able to
> > buckets of the stuff.
> > Note that it involves boiling off ammonia at one point, which I think
> > render the average kitchen uninhabitable. You don't happen to have access
> > to a fume cupboard, do you ?
> > R.
> > On 23/05/2011 08:22, Chocolate Jon wrote:
> > > To Merlin and anyone else that's interested,
> > >
> > > Was looking around and found that you can get 300g of Ferrofluid for
> > > £80 which is cheaper than the $1 per 1 ml that I remember being told.
> > > Source:
> > > http://cgi.ebay.co.uk/300g-Ferrofluid-magnetic-liquid-neodymium-magnet
> > > s-/350
> > >
> > 437073292?pt=UK_BOI_Medical_Lab_Equipment_Lab_Supplies_ET&hash=it
> > em519
> > > 7ad618
> > > c
> > >
> > > But that isn't the Hackspace way so here is a way you can make your
> > > own Ferrofluid (well, liquid magnet since ferrofluid might be a
> > > trademark or
> > > something):
> > >
> > http://chemistry.about.com/od/demonstrationsexperiments/ss/liquidmagn
> > e
> > > t.htm It may not be as good or much different in price but I thought
> > > that you might be interested.
> > >
> > > Hope that helps,
> > > Jon
> > >
> > >
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