scholarly journals Dynamics of hard sphere suspensions using dynamic light scattering and X-ray photon correlation spectroscopy: Dynamics and scaling of the intermediate scattering function

2011 ◽  
Vol 134 (5) ◽  
pp. 054505 ◽  
Author(s):  
V. A. Martinez ◽  
J. H. J. Thijssen ◽  
F. Zontone ◽  
W. van Megen ◽  
G. Bryant
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Hard Sphere ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Scattering Function ◽  
Photon Correlation ◽  
X Ray ◽  
Intermediate Scattering Function ◽  
Sphere Suspensions

A novel event correlation scheme for X-ray photon correlation spectroscopy

2012 ◽  
Vol 45 (4) ◽  
pp. 807-813 ◽  
Author(s):  
Y. Chushkin ◽  
C. Caronna ◽  
A. Madsen
Keyword(s):  
Photon Correlation Spectroscopy ◽  
Glassy State ◽  
Correlation Spectroscopy ◽  
Event Correlation ◽  
Photon Correlation ◽  
X Ray ◽  
Wide Range ◽  
Intermediate Scattering Function ◽  
Speckle Patterns ◽  
Laser Sources

X-ray photon correlation spectroscopy (XPCS) was employed to measure the time-dependent intermediate scattering function in an organic molecular glass former. Slow translational dynamics were probed in the glassy state and the correlation functions were calculated from two-dimensional speckle patterns recorded by a CCD detector. The image frames were analysed using a droplet algorithm together with an event correlation scheme. This method provides results analogous to standard intensity correlation algorithms but is much faster, hence addressing the recurrent problem of insufficient computing power for online analysis in XPCS. The event correlator has a wide range of potential future applications at synchrotrons and free-electron laser sources.

scholarly journals Research of the oils for ship engine by means of dynamic light scattering method

2020 ◽  
pp. 103-108
Author(s):  
Н.Я. Синявский ◽  
И.П. Корнева ◽  
А.М. Иванов ◽  
Н.А. Кострикова
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Spectroscopy Method ◽  
Engine Oil ◽  
Scattering Method ◽  
Photon Correlation ◽  
Dynamic Light Scattering Method ◽  
Marine Diesel

В данной статье исследована возможность использования метода фотонной корреляционной спектроскопии с целью диагностики судовых двигателей по отработанному моторному маслу для повышения экономичности и безопасности эксплуатации морских судов. Необходимость разработки и внедрения новых эффективных методов диагностики судовых дизелей является актуальной задачей. Целью данной работы явилось исследование ряда свежих и отработанных масел методом динамического рассеяния света для определения изменений, происходящих с маслом в процессе эксплуатации судового дизеля, и выяснения связи этих изменений с неисправностями двигателя. В литературе публикации о подобных исследованиях отсутствуют и результаты, приводимые в настоящей работе, обладают новизной. При исследовании использовался метод фотонной корреляционной спектроскопии для измерения корреляционных функций и последующего получения распределений времен корреляции, коэффициентов диффузии и размеров частиц. Для инверсии преобразования Лапласа применялся метод, основанный на минимизации среднеквадратичного отклонения и регуляризации (RILT), модифицированный для нахождения распределения времен корреляции. Установлено, что распределения гидродинамических радиусов частиц для свежих и отработанных масел существенно различаются. По характеру распределений крупных частиц установлено, что в отработанных маслах понижается уровень агрегации или мицеллообразования полимера модификатора вязкости. Показано, что метод динамического рассеяния света позволяет получать параметры, пригодные для анализа состояния моторного масла и для получения диагностических данных о состоянии двигателя по отработанному маслу. Полученные результаты обладают надежностью, что подтверждается многократной апробацией и общим признанием эффективности метода фотонной корреляционной спектроскопии в разных областях науки. Достоверность полученных результатов подтверждается устойчивостью экспериментов при их многократном повторении, корректностью математической обработки и широкой апробацией используемых методов в мировой практике. Тhe possibility of using the photon correlation spectroscopy method for the purpose of diagnostics of marine engines based on used engine oil to improve the efficiency and safety of operation of marine vessels is investigated in this article. The need to develop and implement new effective methods of diagnostics of marine diesel engines is an actual task. The purpose of this work was to study a number of fresh and used oils by dynamic light scattering method to determine the changes that occur with the oil during the operation of a marine diesel engine, and to find out the connection of these changes with engine failures. There are no publications about such studies in the literature, and the results presented in this paper are new. The photon correlation spectroscopy method was used to measure correlation functions and then obtain distributions of correlation times, diffusion coefficients, and particle sizes. To invert the Laplace transform, we used a method based on minimizing the standard deviation and regularization (RILT), modified to find the correlation time distribution. It was found that the distributions of hydrodynamic radii of particles for fresh and used oils differ significantly. By the character of the distributions of large particles, it was found that the level of aggregation or micelle formation of the polymer of the viscosity modifier decreases in the used oils. It is shown that the dynamic light scattering method allows to obtain parameters suitable for analyzing the state of engine oil and for obtaining diagnostic data on the state of the engine for used oil. The results obtained are reliable, which is confirmed by repeated testing and general recognition of the effectiveness of the photon correlation spectroscopy method in various fields of science. The reliability of the results obtained is confirmed by the stability of experiments when repeated many times, the correctness of mathematical processing and wide approbation of the methods used in the world practice.

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

scholarly journals Atomic Migration Studies with X-Ray Photon Correlation Spectroscopy

2014 ◽  
Vol 2 ◽  
pp. 73-94 ◽  
Author(s):  
Markus Stana ◽  
Manuel Ross ◽  
Bogdan Sepiol
Keyword(s):  
Low Temperatures ◽  
Short Range ◽  
Short Range Order ◽  
Photon Correlation Spectroscopy ◽  
Condensed Matter ◽  
Correlation Spectroscopy ◽  
Atomic Scale ◽  
Photon Correlation ◽  
X Ray ◽  
Amorphous Systems

The new technique of atomic-scale X-ray Photon Correlation Spectroscopy (aXPCS) makesuse of a coherent X-ray beam to study the dynamics of various processes in condensed matter systems.Particularly atomistic migration mechanisms are still far from being understood in most of intermetallicalloys and in amorphous systems. Special emphasis must be given to the opportunity to measureatomistic diffusion at relatively low temperatures where such measurements were far out of reach withpreviously established methods. The importance of short-range order is demonstrated on the basis ofMonte Carlo simulations.

scholarly journals Distributed X-ray photon correlation spectroscopy data reduction using Hadoop MapReduce

2018 ◽  
Vol 25 (4) ◽  
pp. 1135-1143 ◽  
Author(s):  
Faisal Khan ◽  
Suresh Narayanan ◽  
Roger Sersted ◽  
Nicholas Schwarz ◽  
Alec Sandy
Keyword(s):  
Real Time ◽  
Photon Correlation Spectroscopy ◽  
Correlation Spectroscopy ◽  
Frame Rate ◽  
Computational Techniques ◽  
Complex Materials ◽  
Photon Correlation ◽  
X Ray ◽  
Wide Range ◽  
Recent Developments

Multi-speckle X-ray photon correlation spectroscopy (XPCS) is a powerful technique for characterizing the dynamic nature of complex materials over a range of time scales. XPCS has been successfully applied to study a wide range of systems. Recent developments in higher-frame-rate detectors, while aiding in the study of faster dynamical processes, creates large amounts of data that require parallel computational techniques to process in near real-time. Here, an implementation of the multi-tau and two-time autocorrelation algorithms using the Hadoop MapReduce framework for distributed computing is presented. The system scales well with regard to the increase in the data size, and has been serving the users of beamline 8-ID-I at the Advanced Photon Source for near real-time autocorrelations for the past five years.

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