X-ray Diffraction Receptacle with Permeable Membrane
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Solution Overview
Problem
Current methods for monitoring crystallization processes using X-ray diffraction are limited by the need for synchrotron radiation or external recirculation loops, making it difficult to follow crystallization in a liquid medium, and existing devices cannot handle solid phases in suspension or equilibrium with gases as a function of temperature, solvent, agitation, or humidity.
Innovation Solution
A technique and device that allows X-ray diffraction measurement with a conventional laboratory source, using a thermostatically controlled fluid to regulate temperature and humidity, and a stationary sample holder to analyze solid phases in suspension or equilibrium with a gas, enabling precise discrimination between solid phases and monitoring of crystallization processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchrotron radiation or external recirculation loops are used for X-ray diffraction measurement, then measurement precision is improved, but device complexity and ease of operation deteriorate
Solution Approach 1:
A thin membrane (aluminum or polyimide) is introduced as an intermediary component that allows X-rays to pass through while containing the liquid medium. This membrane acts as a mediator between the sample environment and the X-ray beam, enabling in-situ measurements without requiring complex recirculation loops or synchrotron facilities. The membrane serves multiple functions: containing the sample, allowing X-ray transmission, and maintaining the liquid medium in place during measurement.
Solution Approach 2:
The invention creates a simplified replica of synchrotron-capable measurement conditions using conventional laboratory X-ray sources. By adapting the sample holder design with the thin membrane and optimizing the measurement geometry, the system copies the essential measurement capabilities of synchrotron facilities while using accessible, less complex equipment. This allows researchers to achieve similar measurement precision without the complexity and cost of synchrotron radiation facilities.
2Measurement precision
If a rotating sample holder is used during analysis, then measurement precision is improved, but the ability to monitor crystallization in suspension deteriorates
Solution Approach 1:
The invention transitions from a static sample holder to a dynamic system where the sample environment can be actively controlled. The sample holder is designed to accommodate temperature control, agitation, and gas flow while maintaining X-ray transparency. This dynamic capability allows the system to monitor crystallization processes in real-time under various process conditions without requiring rotation during the actual measurement, thus preserving both measurement precision and process monitoring versatility.
Solution Approach 2:
The sample holder is segmented into distinct functional zones: a measurement zone for X-ray diffraction, a temperature control zone with heating/cooling elements, an agitation zone with magnetic stirrers, and a gas flow zone for humidity control. This segmentation allows each function to operate independently and optimally, enabling simultaneous temperature control, agitation, and X-ray measurement without interference, thus resolving the contradiction between measurement precision and process monitoring capability.
3Device complexity
If conventional laboratory X-ray sources are used, then device complexity is reduced, but measurement precision deteriorates
Solution Approach 1:
The invention optimizes several parameters to enhance measurement precision with conventional X-ray sources: (1) membrane thickness is reduced to minimize X-ray absorption and scattering, (2) measurement geometry is optimized with specific source-to-sample and sample-to-detector distances, (3) exposure times are extended to accumulate sufficient signal, and (4) data processing algorithms are refined to enhance peak discrimination. These parameter changes collectively compensate for the lower intensity of conventional sources while maintaining system simplicity.
Solution Approach 2:
The measurement process uses periodic scanning of the diffraction pattern with fine angular steps, accumulating data over multiple passes. This periodic measurement approach allows the system to build up sufficient signal-to-noise ratio even with lower intensity conventional X-ray sources. The periodic nature of the measurement also allows for real-time monitoring of crystallization kinetics while maintaining adequate measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise in situ monitoring of crystallization processes, including polymorphic transformations, solvent exchanges, and stability studies, without the need for synchrotron radiation, and allows for the detection of metastable phases and intermediate reaction products, even with low-mass samples.
Implementation Method 1
a fluid thermostatically controlled at the same temperature as that of the compound to be analyzed in the container is projected towards the flat bottom permeable to X-rays
Implementation Method 2
The X-ray generator sends X-rays onto the compound to be analyzed
Implementation Method 3
X-ray diffractometry is an analysis technique based on the diffraction of X-rays on crystalline material
Implementation Method 4
method of measuring scattering of X-rays
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
Method of measuring scattering of X-rays, characterized in that a compound to be analyzed is installed in a receptacle (1) comprising a flat bottom permeable to X-rays, in that an analysis by scattering of the X-rays is carried out by sending a stream of X-rays upwards in the direction of said bottom permeable to the X-rays and by measuring the stream of scattered X-rays that is reflected downwards, and in that a thermostatically controlled fluid at the same temperature as that of the compound to be analyzed in the receptacle is projected towards the flat bottom (3) permeable to X-rays, from outside the receptacle (1), and device for measuring scattering of X-rays characterized in that it comprises a receptacle (1) comprising a bottom shut off by a membrane (3) transparent to X-rays, as well as a diffractometer whose goniometer (4, 5) is installed so as to direct a beam of X-rays from below towards the membrane (3) transparent to X-rays and the detector (5) being installed for the measurement of the X-rays scattered therebelow.