---------- Forwarded message ---------- From: 최종락 <jonglakc...@gmail.com> Date: Thu, Jul 12, 2018 at 10:17 AM Subject: Re: XRD on cotton yarn To: Edward Laitila <ealai...@mtu.edu>
Ed, Thank you for your input for me. So, as for the area prep., 1mm thick should be enough? and I will try to cut the area again that I have done it before...May I ask if you know any article that talked about the quantification analysis in other ways than cut and weigh? I really like to express my appreciation for being connected with me again. Best, CJ On Thu, Jul 12, 2018 at 7:51 AM, Edward Laitila <ealai...@mtu.edu> wrote: > CJ, > > When doing any quantitative analysis based on intensity one must ensure > that the sample is larger than the diffracting volume; i.e. the area of > projection is larger at lower angles while the depth of penetration > decreases. Make sure the sample is long enough and thick enough. When doing > this type of analysis you must collect as large of an angle range as needed > to get enough crystalline and amorphous scattering. If your sample is large > enough sample holders will not be a problem, if it is not this causes > issues with the measurement but using a zero background holder will > eliminate the additional amorphous scattering but the analysis will be in > error. If you do not have profile fitting software (using profile fitting > one can do this by hand if you can also fit the amorphous content) you > could plot the scans out and cut out the amorphous and crystalline peaks > and weight them, then remove the crystalline peaks and weigh them, to get > the ratio of crystalline area to total area. > > Hope that helps some, > Ed > > On Thu, Jul 12, 2018 at 7:44 AM, 최종락 <jonglakc...@gmail.com> wrote: > >> Dear All, >> Hi, how are you, guys. >> My name is Jonglak choi, who is working on obtaining quantity of >> crystalline through CI(%)-cyrstal index for natural cotton (cellulose type >> I). We have Rigaku XRD instrument for obtaining defraction pattern from the >> cotton yarns. In order to know about the quantity of crystalline phase out >> of natural mixture of amorphous and crystalline cellulose, I think that 1. >> I should run XRD to get real one without preferred orientation and z-shift, >> 2. I should have good and easy way to separate the phases. >> Do you have any suggestion for 1, and 2 above in my statement? >> For example. >> 1. Running XRD, I found glass slides in the room for XRD, quartz or pyrex >> glass plates; I am interested in 18 degree, and ~20 degree 2theta. which >> one I can use and background problem? >> If I simply wrap around the glass slide, hair from yarn should be >> problem? because it will stick out and move during the collection? >> If I grind the yarn into powder-it becomes cotton ball after grinding in >> wiley mill-and fixed on the glass slide with geese, is there any concern? >> >> 2. Processing data, after collecting diffraction pattern, what is the >> best and easy way to know how much crystalline phase exist out of >> amorphose? I do not have a software for deconvolution now. >> >> I am looking forward to hearing suggestions. >> >> Thank you and have a great day >> >> Best, >> >> CJ >> >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> Please do NOT attach files to the whole list <alan.he...@neutronoptics.com >> > >> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body >> text >> The Rietveld_L list archive is on http://www.mail-archive.com/ri >> etvel...@ill.fr/ >> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >> >> >> > > > -- > Dr. Edward A. Laitila > Senior Research Engineer/Scientist II/Adjunct Assistant Professor > Michigan Technological University > Dept. of MSE > Room 628 M&M Building > (906) 369-2041 >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
