Carbon Black Polymer Composite for Dynamic Nuclear Polarization
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Solution Overview
Problem
Current polymer composite materials, especially those containing carbon black, achieve low proton spin polarization in dynamic nuclear polarization, and existing techniques for structural analysis of multicomponent systems face challenges with solvent contrast variation neutron scattering and require high proton spin polarization.
Innovation Solution
A polymer composite material with a thickness of 0.8 mm or less, doped with a paramagnetic radical compound, and a deuterated solvent is used to achieve high proton spin polarization and accurate structural analysis through 1H dynamic nuclear polarization contrast variation neutron scattering, even when proton spin polarization is less than 60%. The material is produced by diffusing the paramagnetic radical compound in an inert gas or vacuum environment to prevent temperature increases and ensure uniform radical distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer composite material containing carbon black is used for dynamic nuclear polarization, then the material can be applied to neutron scattering experiments, but the proton spin polarization is very low (at most 20%)
Solution Approach 1:
The patent changes the physical and chemical parameters of the polymer composite material by introducing a deuterated solvent with specific properties (deuterium content, molecular weight, viscosity) to optimize the polarization transfer efficiency. This parameter change enables achieving high proton spin polarization (greater than 40%) while maintaining the material's applicability to neutron scattering experiments containing carbon black
Solution Approach 2:
The patent creates a composite material system combining polymer matrix, carbon black filler, and deuterated solvent. This multi-component composite structure allows the material to simultaneously achieve high proton spin polarization for NMR experiments and maintain the structural properties needed for neutron scattering experiments, resolving the contradiction between polarization efficiency and experimental applicability
2Measurement precision
If solvent contrast variation neutron scattering is performed on polymer composite materials, then structural analysis can be performed, but the technique requires solvent swelling of samples which is difficult to perform on non-swollen samples
Solution Approach 1:
The patent develops a polymer composite material that serves multiple functions: it provides high proton spin polarization for NMR experiments, maintains structural integrity for neutron scattering, and enables contrast variation studies. The deuterated solvent integrated into the material allows the same sample to be used for both NMR polarization experiments and neutron scattering structural analysis without requiring separate swelling procedures, achieving multi-functionality that resolves the operational complexity
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
The approach enables high proton spin polarization and accurate structural analysis of multicomponent systems, improving experimental data quality and contrast conditions in neutron scattering and NMR experiments, despite the incorporation of carbon black.
Implementation Method 1
In dynamic nuclear polarization, electron spins having a large magnetic moment that is at least several hundred times that of a nuclear spin is introduced into a sample, and then the electron spins are polarized at a low temperature under a high magnetic field, followed by transfer of polarization from the electron spins to the nuclear spins by microwave irradiation
Implementation Method 2
electron spins are polarized at a low temperature under a high magnetic field
Implementation Method 3
transfer of polarization from the electron spins to the nuclear spins by microwave irradiation
Implementation Method 4
This technique utilizes the difference in contrast between protium and deuterium, which is the peculiar nature of neutron scattering
Implementation Method 5
solvent contrast variation neutron scattering is a dominant technique for the structural analysis of multicomponent systems
Implementation Method 6
it has been reported that samples in which a stable vaporized radical compound is diffused into a pure polymer material
Implementation Method 7
stable vaporized radical compound
Implementation Method 8
involves swelling a polymer composite material in a mixture of a protium solvent and a deuterium solvent in varied ratios
Data Source
Figure 1
AI summary
Provided is a polymer composite material which has a high proton spin polarization even though it is a polymer composite material containing carbon black. The present invention relates to a polymer composite material for 1H dynamic nuclear polarization experiments, containing carbon black, having a thickness of 0.8 mm or less, and being doped with a paramagnetic radical compound.