Category Archives: Blog posts

Looking at Nothing, Seeing a Lot.

Today is a day of relief for Dr. Julian Stirling and his eight co-authors (with many looking forward to the response, including Raphaël Lévy). The paper released today opposes ten years of prolific work from a group claiming to have made and observed stripes on the surface of nanoparticles (c.f. Figure 0, Figure 1 in […]

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Interesting stuff coming later today

Waiting for San Francisco to wake up on their Monday and release the good stuff with chewy centres. Please come back later today It’s up here!

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Spending money on Bonse Hart Bling-Bling

[ed1: Progress on the Everything SAXS book has been good: a framework is now in place with chapters, the revision ID on the title page and even a Makefile and readme. The time approaches to enter some content! ed2: Something cool approaches (next week).] Most of the times we are scrounging for crumbs on the […]

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So there is an “Everything SAXS”-book, and it is empty!

For a while now, I have wanted to write a book about SAXS, introducing the topics, explaining the details, and including many of the more popular posts from this site. Unfortunately, no lucrative old-style book contracts have been proffered, so I will resort to another approach: a living Git-book.

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Spheres, rods, discs, which can fit what?

A remark in a recent paper by Dr. Yojiro Oba (currently at KURRI) caught my attention. It discusses which shape assumption can be appropriate to fit a scattering pattern of polydisperse systems. In the paper, the shape assumption is spherical (based on TEM evidence), and a further remark goes as follows: “ Since no q−a […]

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Contrast-variation SAXS

Contrast variation is commonly used in SANS to highlight a single segment of a mutli-part structure. In SANS it is easy to do this because a wide range of scattering length densities can be accessed by simple mixing of water and deuterated water. In SAXS this is not so easy. A recent arXiv paper [1] […]

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Tele-SAXS Beamtime with on-the-fly data corrections.

This has been a very interesting last couple of days. I was unable to join Zoë Schnepp and Martin Hollamby for our SAXS beamtime at Diamond. Instead, I decided to try and join in from abroad. The plans were ambitious: to do on-the-fly high-quality data correction and analysis. In the end there we achieved partial […]

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Preparing for Beamtime

One more burst of beamtime is coming up at the end of this week. This one will be with Zoë, Martin and Ashleigh once more, but there is one big difference: I ran out of funding, so I won’t be there!

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Video: “Applied Metrology of Small-angle Scattering”

Another video, and this one was a bit sizeable. The video is the majority of the introduction of my talk series for this year. The “Applications of SAXS”-series was part of the same. This introduction touches on a variety of topics, including one thing I have not yet talked to you much about: stripy nanoparticles.

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Guinier in polydisperse systems revisited

Last week, I was contacted by Christian Gollwitzer (author of this excellent paper) about something posted here (and in particular detailed in this document) a while ago. It concerns the behaviour of the Guinier approxiation for polydisperse systems, and it looks like I made a mistake when writing that document.

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