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GB/T 47280-2026Nanotechnology - Test method for the magnetic resonance relaxivity of ferrite nanoparticles (English PDF)

纳米技术　铁氧体纳米颗粒磁共振弛豫效能测试方法

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 31, 2026

Implementation date

October 1, 2026

Scope

GB/T 47280-2026 is the English-translated version of 纳米技术　铁氧体纳米颗粒磁共振弛豫效能测试方法.

GB/T 47280-2026 is the Chinese standard "Nanotechnology - Test method for the magnetic resonance relaxivity of ferrite nanoparticles".

Its scope clause reads: This document describes a method for testing the magnetic resonance relaxation efficiency of ferrite nanoparticles, including the preparation of samples with different concentrations, relaxation time, and...

Testing of relaxation efficiency, etc. This document applies to the testing of the magnetic resonance relaxation efficiency of ferrite nanoparticles. Its clauses include terms and definitions.

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Document preview — GB/T 47280-2026

National Standard of the People's Republic of China

ICS: 07.120
Classification: L 04

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

Preface
Introduction
1.Scope
2 Normative References
3.Terms and Definitions
4.Abbreviations
5.Principle
6.Instruments, Equipment and Reagents
7.Preparation of diluent for ferrite nanoparticles
8.Test Environment
9 Tests
10 Calculations
11.Sources of Uncertainty
12 Test Reports
Appendix A (Informative) Example of relaxation performance testing for ferrite nanoparticles
References

1 Scope

This document describes a method for testing the magnetic resonance relaxation efficiency of ferrite nanoparticles, including the preparation of samples with different concentrations, relaxation time, and...

Testing of relaxation efficiency, etc.

This document applies to the testing of the magnetic resonance relaxation efficiency of ferrite nanoparticles.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 626 Chemical Reagent Nitric Acid

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 38812.3 Determination of the content of iron, silicon, manganese, phosphorus, vanadium, titanium, copper, aluminum, arsenic, magnesium, calcium, potassium, and sodium by direct reduction, including inductive coupling, etc.

Ionic atomic emission spectrometry

3 Terms and Definitions

The following terms and definitions apply to this document.

3.1 nanoparticles

Nano-objects with all three external dimensions at the nanoscale.

Note. If the difference between the longest and shortest axes of a nanomaterial is significant (greater than 3 times), nanoparticles are represented by nanofibers and nanosheets.

[Source. ISO 80004-1.2023, 3.3.4]

3.2 Ferrite nanoparticles

Nanoparticles with the chemical formula MxFe3-xO4 (M = Fe, Mn, Zn, Cu, Mg, etc.) and possessing a spinel or anti-spinel structure.

3.3

The combined magnetization vector produced by the spin of the atomic nucleus in a magnetic field, when excited by a radio frequency signal, undergoes Larmor precession.

After the sign is removed, the time it takes for the component of the synthesized magnetization vector on its spin axis (Z-axis) to change back to its initial state (before the application of the radio frequency signal).

Note. The composite magnetization vector is restored to 1- based on its component along its spin axis (Z-axis).

The longitudinal relaxation time value is determined at e().

......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 14 pages — is available in the English PDF.

Referenced standards

Normative references

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