Niki, Sorry for the delay. I'm afraid your PDF came through completely garbled so could not see what you are talking about. However, I would not necessarily expect big differences in the scattering pattern depending on the exact value of the parameters being used. Could you send the list of parameter=values you used for the two cases? I understand you used two different models. That will tell me if what you are seeing is reasonable or not. Cheers Paul On Mon, Dec 7, 2015 at 4:48 AM, Niki Baccile <niki.baccile@...16...> wrote:

They do look slightly different but I guessed that they were still too close for two systems the difference of which lies in the rim - face thickness environments.

Niki

At 06:40 PM 12/4/2015, He, Lilin wrote:

They do look different to me if you take a closer look at the first minimum of the curves you showed in the graph.

LH -----Original Message----- From: Niki BACCILE [ mailto:niki.baccile@...16... <niki.baccile@...16...>] Sent: Thursday, December 03, 2015 6:28 PM To: He, Lilin; butlerpd@...4... Subject: RE: [Sasview-users] CoreShellBicelle Model help

Hi Lilin, Paul

thank you for taking the time to think about it. The document online are not clear. Lilin, yes, that is exactly the sense of setting L>>R (cylinder) or L<<R (platelet, bicelle,...) even if the mathematical expression is the same. However, what I do not get is the following (sorry, I get into the details):

I obtain the same model curve if I set L<<R, a Rim Thickness= 0 and a Face Thickness> 0 in the CoreShellBicelle, which should provide a sort of platelet (no rim at the edges), and, using this time a Core Shell Cylinder model with L<<R and a shell thickness (which should correspond to the Rim) having the same value as the Face Thickness...

You can visualize what I mean in the attached pdf. The red (CoreShellBicelle) and green (CoreShellCylinder) curves are coincident (do not mind the experimental data and the physical meaning of the values which apply good to my system) but if you look closer to the parameters, it should not be so, because I set the FaceThickness in the bicelle (thye Rim of which is zero) equal to the thickness in the cylinder, but these should not refer to the same thing!

I hope this is not too messy, but it puzzles me quite a lot because I want ot be sure that the model I am employing is correct.

Thank you

Niki

"He, Lilin" <hel3@...17...> a écrit :

...

Here is my understanding:

These two shapes share the same mathematical equation for the form factor. We do need to change the initial parameters for the CoreShellBicelle model to make it reasonable.

LH

From: Paul Butler [ mailto:butlerpd@...4... <butlerpd@...4...>] Sent: Monday, November 30, 2015 8:56 PM To: Mailing list for users of SasView Cc: users@...2... Subject: Re: [Sasview-users] CoreShellBicelle Model help

In short, as I understand your questions the answer is yes.

Actually there is no requirement that L>R. L is defined as along the axis and R is the radially symmetric dimension. Indeed with L>>R it would be considered a long rod while L<R would be a disc. Also you could have L=R. So the base of the bicelle is a disc. As for # 2 yes the rim is the shell around the axial dimension, while the face would be effectively another disc on each "face" of the disc

Hope this helps

Paul

On Mon, Nov 30, 2015 at 1:58 PM, Niki BACCILE <niki.baccile@...16...<mailto:niki.baccile@...16...>> wrote: Dear Users

Can anyone provide some help on the CoreShellBicelle Model (1D version) developed in SasView and referring to the documentation below?

http://www.sasview.org/docs/user/models/model_functions.html#coreshellbicell...

...

The following is not clear to me:

1) It is said that that the CoreShellBicelle Model is developed on the basis of the CoreShell Cylinder. I suppose that what it means is that if one squeezes a cylinder in its length (Radius>>Length), one obtains a bicelle morphology from a cylinder. However, in the Bicelle standard parameters, it is the contrary, Length (400)>>Radius(20). Is this normal?

2) In the CoreShellCylinder model, the Shell surrounds the Core in the axial direction, parallel to the length of the cylinder, as shown in

http://www.sasview.org/docs/user/models/model_functions.html#coreshellcylind...

...

Now, if I "squeeze" the cylinder in its length to make it a bicelle, I suppose that the shell will then correspond to the Rim Thickness of the bicelle. Is this correct? Or I did not figure this out at all in the rigth way and the Shell of the cylinder actually corresponds to the Face Thickness?

Thank you very much for your help.

Niki

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