Comparison of Brownian dynamics with photon correlation spectroscopy of strongly interacting colloidal particles

1981 ◽  
Vol 75 (4) ◽  
pp. 1682-1689 ◽  
Author(s):  
Kevin Gaylor ◽  
Ian Snook ◽  
William van Megen
Keyword(s):  
Brownian Dynamics ◽  
Colloidal Particles ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
Strongly Interacting

Photon statistics and speckle visibility spectroscopy with partially coherent X-rays

2014 ◽  
Vol 21 (6) ◽  
pp. 1288-1295 ◽  
Author(s):  
Luxi Li ◽  
Paweł Kwaśniewski ◽  
Davide Orsi ◽  
Lutz Wiegart ◽  
Luigi Cristofolini ◽  
...  
Keyword(s):  
Brownian Dynamics ◽  
Photon Correlation Spectroscopy ◽  
Colloidal Suspension ◽  
Correlation Spectroscopy ◽  
Integration Time ◽  
Photon Statistics ◽  
X Rays ◽  
Photon Correlation ◽  
X Ray ◽  
Partially Coherent

A new approach is proposed for measuring structural dynamics in materials from multi-speckle scattering patterns obtained with partially coherent X-rays. Coherent X-ray scattering is already widely used at high-brightness synchrotron lightsources to measure dynamics using X-ray photon correlation spectroscopy, but in many situations this experimental approach based on recording long series of images (i.e.movies) is either not adequate or not practical. Following the development of visible-light speckle visibility spectroscopy, the dynamic information is obtained instead by analyzing the photon statistics and calculating the speckle contrast in single scattering patterns. This quantity, also referred to as the speckle visibility, is determined by the properties of the partially coherent beam and other experimental parameters, as well as the internal motions in the sample (dynamics). As a case study, Brownian dynamics in a low-density colloidal suspension is measured and an excellent agreement is found between correlation functions measured by X-ray photon correlation spectroscopy and the decay in speckle visibility with integration time obtained from the analysis presented here.

scholarly journals DETERMINATION OF OPTIMAL MODES FOR MEASURING THE SIZE OF COLLOIDAL PARTICLES BY PHOTON-CORRELATION SPECTROSCOPY AND ACOUSTIC SPECTROSCOPY

2020 ◽  
pp. 232-242
Author(s):  
Мария Анатольевна Ясная ◽  
Андрей Владимирович Блинов ◽  
Анастасия Александровна Блинова ◽  
Ирина Михайловна Шевченко ◽  
Давид Гурамиевич Маглакелидзе ◽  
...  
Keyword(s):  
Colloidal Particles ◽  
Photon Correlation Spectroscopy ◽  
Position Angle ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
Acoustic Spectroscopy ◽  
Substance Concentration ◽  
Mathematical Processing ◽  
First Time

В данной работе представлены результаты измерения размера коллоидных частиц SiO двумя методами - фотонно-корреляционной спектроскопией динамического рассеяния света и акустической спектроскопией. Математическая обработка экспериментальных данных с помощью программного обеспечения спектрометров «Photocor-Complex» и «DT-1202» позволила получить гистограммы распределения по размерам коллоидных частиц диоксида кремния в стандартном образце. Впервые установлено, что оптимальными параметрами для измерения размера коллоидных частиц SiO методом фотонно-корреляционной спектроскопии являются концентрация вещества менее 1 %, угол положения фотодетектора 90° и количество измерений в цикле 50 - 100, а акустической спектроскопии - концентрация 1 %. This paper presents the results of measuring the size of colloidal SiO particles by two methods - photon-correlation spectroscopy of dynamic light scattering and acoustic spectroscopy. Mathematical processing of experimental data using the software of the Photocor-Complex and DT-1202 spectrometers made it possible to obtain of the size distribution histograms for silicon dioxide colloidal particles in a standard sample. For the first time it has been established that the optimal parameters for measuring the size of colloidal SiO particles by the photon-correlation spectroscopy are the substance concentration less than 1 %, the photodetector position angle of 90 degrees and the number of measurements in a cycle of 100 -150, and for the acoustic spectroscopy - 1 % substance concentration.

scholarly journals From Femtoseconds to Hours–Measuring Dynamics over 18 Orders of Magnitude with Coherent X-rays

2021 ◽  
Vol 11 (13) ◽  
pp. 6179
Author(s):  
Felix Lehmkühler ◽  
Wojciech Roseker ◽  
Gerhard Grübel
Keyword(s):  
Time Scales ◽  
Free Electron Laser ◽  
Photon Correlation Spectroscopy ◽  
Signal To Noise Ratio ◽  
Coherent Scattering ◽  
Correlation Spectroscopy ◽  
X Rays ◽  
Photon Correlation ◽  
X Ray ◽  
Scattering Technique

X-ray photon correlation spectroscopy (XPCS) enables the study of sample dynamics between micrometer and atomic length scales. As a coherent scattering technique, it benefits from the increased brilliance of the next-generation synchrotron radiation and Free-Electron Laser (FEL) sources. In this article, we will introduce the XPCS concepts and review the latest developments of XPCS with special attention on the extension of accessible time scales to sub-μs and the application of XPCS at FELs. Furthermore, we will discuss future opportunities of XPCS and the related technique X-ray speckle visibility spectroscopy (XSVS) at new X-ray sources. Due to its particular signal-to-noise ratio, the time scales accessible by XPCS scale with the square of the coherent flux, allowing to dramatically extend its applications. This will soon enable studies over more than 18 orders of magnitude in time by XPCS and XSVS.

scholarly journals Grain Growth and Coarsening Dynamics in a Compositionally Asymmetric Block Copolymer Revealed by X-ray Photon Correlation Spectroscopy

2020 ◽  
Vol 53 (19) ◽  
pp. 8233-8243
Author(s):  
Ronald M. Lewis ◽  
Grayson L. Jackson ◽  
Michael J. Maher ◽  
Kyungtae Kim ◽  
Suresh Narayanan ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Grain Growth ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Photon Correlation ◽  
X Ray ◽  
Coarsening Dynamics
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