Tag Archives: Review
Comments on Deschamps, 2011 and A clarification on Guinier for Polydisperse systems
After browsing through a recent Journal of Applied Crystallography, I came across a paper by Deschamps. It indicates to me that there is a slight lack of information communication in some aspects of SAXS. Firstly, it mentions in the introduction that the advanced (Fourier-transform-based) SAXS analysis methods cannot “extract simultaneously the precipitate form factor and [...]
Notes on Guinier
…well, his famous SAXS analysis method. This documentGuinier_short, copyright Brian Pauw gives a short description and review of the applicability of the Guinier method to polydisperse systems. It also shows, through analysis of simulated data, what q-range should be measured for the Guinier method to be valid. In short, the rule of qmax=1.3/Rg still holds, [...]
Read Ruland and more free reading (textbooks!)
Catching up to current affairs, I stumbled across this beauty. Now, I find this paper starts a little bit chaotic, but very quickly we come across some very useful equations indeed, and a link between the used equation for their analysis of phase transitions in fluids, and various other equations such as the Ornstein-Zernike structure [...]
Holiday reading, watching and writing.
Hi all, I found some interesting papers for you, and a talk. Let me start with the talk. It is a TED talk (naturally) concerning TED talks. This nice introspective talk is actually of interest for all of us as it gives a few pointers to the set-up of excellent (and terrible) talks, with a [...]
Bayesian Inverse Fourier Transforms
Although I cannot say I completely grasp the underlying theory, the Bayesian approach to the Inverse Fourier Transformation of (isotropic) small-angle scattering patterns certainly appeals to me. The idea is that the small-angle scattering pattern can be transformed (back) into real-space, resulting in either a distance distribution function p(r), a correlation function gamma(r) (=r^2 p(r) [...]
Particle size distribution: review of “Small-Angle X-ray and Neutron Scattering of Polydisperse Systems: Determination of the Scattering-Particle-Size Distribution”
The determination of the particle size distribution from small-angle scattering curves is usually achieved by assuming a certain statistical size distribution model (f.ex. a Schultz distribution, a Gaussian distribution or a log-normal distribution), and fitting this to the data using a non-linear least-squares optimisation method. Fitting multimodal distributions then implies the addition of multiple contributions, [...]
SASFIT software
The famous question of the uninitiated in small-angle scattering is: “Do you have a bit of software which will give me an answer from my data?”. After a lengthy explanation (coloured with some anecdotes) about why small-angle scattering is not a uniquely defined problem with an often unique answer such as wide-angle diffraction might be, the [...]
Book review: X-Ray Scattering of Soft Matter by Norbert Stribeck
I’ve borrowed a copy of the book “X-Ray Scattering of Soft Matter” by Norbert Stribeck (published by Springer) from one of my supervisors, and I’ve taken some time to browse through it. I must admit, I haven’t read it cover-to-cover, but have tried to use it as a reference book, just like ye olde “Small [...]
Interesting stuff
Ok, so I’ve been on holiday and haven’t updated the site in a while. My apologies for that.. I’ve been looking at some presentations from other groups and other organisations, and I see some very inspiring stuff there. Here’s what I’ve stumbled across in general: The TED talks are a collection of talks on a broad range of [...]
Article review – SAXS on mist.
From the proceedings of the 2006 conference on SAXS, held in Kyoto, comes this article entitled “Small-angle X-ray scattering investigation of water droplets in mist” by Y. F. Yano et al.. The article itself is found lacking in many places, on which I’ll touch briefly at the end, but the topic itself is rather unique. [...]