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Time distinguishing and stretching device for small-angle neutron scattering spectrometer

A neutron scattering and time-resolved technology, which is applied in the use of wave/particle radiation for material analysis, measuring devices, instruments, etc., can solve the problem of similar exploration of synchrotron radiation light sources and commercial light sources, and the matching time-resolved stretching device has not yet been found. , unable to realize the time-resolved loading function and other problems, to achieve the effect of saving manpower, high transmittance, and reducing misoperation

Pending Publication Date: 2018-11-20
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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AI Technical Summary

Problems solved by technology

[0003] At present, domestic neutron scattering (diffraction) diffraction technology is in its infancy, and no company has been found to design and develop such a supporting time-resolved stretching device with both temperature control and stretching control for neutron scattering (diffraction) spectrometers.
However, X-rays are not suitable for studying the conformation of a single molecular chain, and no similar explorations based on synchrotron radiation light sources and commercial light sources have been found.
Some shear rheological devices on small-angle neutron scattering platforms in the world have been able to perform neutron scattering tests under temperature control and achieve time-resolving functions, but there is a serious problem, that is, the samples targeted are all in solution state sample, very limited torque
For highly elastic and rubbery samples, time-resolved loading functions cannot be achieved

Method used

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  • Time distinguishing and stretching device for small-angle neutron scattering spectrometer

Examples

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Effect test

Embodiment 1

[0035] Time-resolved small-angle neutron scattering experiments of deuterated polyethylene / polyethylene blend crosslinked networks.

[0036] Purpose:

[0037] The deformation mechanism of the polymer cross-linked network, especially the initial structural elongation of the sample under the temperature and stress field, is the key starting point of polymer condensed matter physics. Utilizing the significant difference in the coherent scattering length of D and H in neutron scattering, the blending of deuterated polyethylene and polyethylene (bulk) is selected, and they are uniformly mixed by solution blending method. After drying and pressing, the deuterium-labeled polyethylene network material was obtained by irradiation cross-linking, which was used for the small-angle neutron scattering time-resolved study of the external field response of the polymer network. The purpose of this experiment is to combine the small-angle neutron scattering under the in-situ temperature field...

Embodiment 2

[0041] Experimental study of time-resolved small-angle neutron scattering of carbon nanotube-filled silicone rubber.

[0042] The implementation of this embodiment is basically the same as that of Example 1, the main difference being that the sample is a rubbery sample under normal temperature conditions and can be carried out at room temperature, so the normal temperature mode is selected for testing. Another difference is that the scale of carbon nanotubes is relatively large, so the distance from the sample to the detector of the selected small-angle neutron scattering spectrometer is 11 meters, which is more suitable for the research of this system.

[0043] In this example, through the time-resolved small-angle neutron scattering in-situ stretching experiment, the structural orientation rules of the nano-filled linear carbon nanotubes in the silicone rubber matrix under different strain conditions were obtained.

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Abstract

The invention discloses a time distinguishing and stretching device for a small-angle neutron scattering spectrometer. According to the time distinguishing and stretching device disclosed by the invention, samples which are fixed between a movable sliding block and a fixed sliding block are loaded in a temperature oven, wherein the movable sliding block is provided with chucks and arranged on twoends of guide rails, and the fixed sliding block is connected with a force sensor and is provided with chucks; under the driving of a servo motor controlled by a computer, controllable reciprocating stretching movement is performed on the samples; the temperature in the temperature oven is controlled through a temperature control cabinet; the temperature oven is fixed to a base; the base is mounted on a working platform of the small-angle neutron scattering spectrometer in a clamping manner; and after neutrons penetrate through a neutron beam incident window in the center of the temperature oven, the neutrons and the samples are in action so as to obtain a scattering signal, and the scattering signal is received by a detector of the small-angle neutron scattering spectrometer. Through theadoption of the time distinguishing and stretching device disclosed by the invention, the time distinguishing test of structure evolution of the samples which are in home position combination with small-angle neutron scattering is realized, and the time distinguishing and stretching device has the advantages of being simple to mount, easy to disassemble, synchronous in time, accurate in displacement, automatic, labor-saving and the like, and is suitable for a time distinguishing test of an evolution law of materials under an external force condition in the small-angle neutron scattering study.

Description

technical field [0001] The invention belongs to the technical field of in-situ automatic measurement of neutron scattering, and in particular relates to a time-resolved stretching device for a small-angle neutron scattering spectrometer. Background technique [0002] In the study of materials such as soft matter (polymers, biomacromolecules, gels, etc.), the small-angle neutron scattering method has unique advantages in deuterium labeling and contrast changes. Utilizing the ability of neutrons to distinguish hydrogen and deuterium isotopes, isotope replacement can be used to enhance or change the contrast without changing the chemical composition of the system. This makes the small-angle neutron scattering method an indispensable means for the study of structural analysis, dynamics, and rheological mechanisms in soft materials. However, the time resolution of neutron scattering has been limited by the beam intensity. Using the time information of neutrons, as well as the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20008G01N23/202
CPCG01N23/20008G01N23/202G01N2223/106G01N2223/054
Inventor 刘栋王亭亭孙光爱孙良卫陈良黄粒朝王燕庞蓓蓓龚建
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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