GB/T 38431-2019 English PDF

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GB/T 38431-2019: Particulate - Dispersion stability analysis - Static multiple light scattering
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 38431-2019	258	Add to Cart	2 days	Particulate - Dispersion stability analysis - Static multiple light scattering	Valid

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Basic data

Standard ID: GB/T 38431-2019 (GB/T38431-2019)
Description (Translated English): Particulate - Dispersion stability analysis - Static multiple light scattering
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A28
Classification of International Standard: 19.120
Word Count Estimation: 18,199
Date of Issue: 2019-12-31
Date of Implementation: 2020-03-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration
Summary: This standard specifies methods for evaluating the stability of dispersions using the principle of static multiple light scattering, including principles and methods, measurement systems, measurement system verification and calibration, measurements and test reports. This standard is applicable to dispersion systems with particle size of 50nm to 1mm and volume fraction of 0.01% to 60%. Other concentrations of dispersion systems can be implemented by reference.

GB/T 38431-2019: Particulate - Dispersion stability analysis - Static multiple light scattering

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Particulate--Dispersion stability analysis--Static multiple light scattering ICS 19.120 A28 National Standards of People's Republic of China Evaluation of stability of particle dispersion system Static multiple light scattering Published on December 31,.2019 2020-03-01 Implementation State Administration of Market Supervision and Administration Issued by the National Standardization Management Committee

Contents

Foreword I Introduction II 1 Scope 1 2 Terms and definitions 1 3 Symbols and abbreviations 1 3.1 Symbol 1 3.2 Acronyms 2 4 Principles and methods 2 5 Measuring system 4 6 Verification and calibration of measurement systems 4 6.1 Installation requirements 4 6.2 Calibration 4 7 Measurement 5 7.1 Preheating 5 7.2 Sample loading 5 7.3 Test 5 7.4 Data processing 5 8 Test report 5 Appendix A (informative appendix) Multiple Light Scattering (MLS) theory and measurement principles 7 Appendix B (informative appendix) Instability handling example 10 Appendix C (Informative Appendix) Decentralized System Stability Test Report 12 Reference 14

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed and managed by the National Technical Committee for Particle Characterization and Sorting and Screen Standardization (SAC/TC168). This standard was drafted by. China Academy of Metrology, Beijing Powder Technology Association, Shenzhen Defang Nanotechnology Co., Ltd., Beijing Daxianxing Technology Industry Co., Ltd., Beijing Physical and Chemical Analysis and Test Center, Institute of Process Engineering, Chinese Academy of Sciences, China Machine Productivity Promotion Center Xin, South China Normal University, Zhuhai Truth Optical Instrument Co., Ltd., Beijing Coast Hongmeng Standard Material Technology Co., Ltd., Zhejiang Doppler Environmental Protection Technology Co., Ltd., China Jiliang University, Hangzhou Wahaha Group Co., Ltd., Shanghai Chuangyuan Cosmetics Co., Ltd., Zhejiang Xinan Chemical Group Co., Ltd., Beijing Landison Technology Co., Ltd., National Nanoscience Center, Changsha Leyuan Chemical Technology Co., Ltd. The main drafters of this standard. Zhang Wenge, He Wei, Shang Weili, Zhou Henghui, Gao Yuan, Li Zhaojun, Zhou Lan, Wang Yuanhang, Zhou Suhong, Yu Fang, Han Peng, Zhang Fugen, Li Li, Zou Zongyong, Yu Mingzhou, Jiang Xiaorui, Gao Jie, Zhu Xiaoyang, Liu Junjie, Han Yuan, Peng Li, Wu Weidu, Qian Zhigang, Zeng Sili, Huang Kaibing, Wu Fenxia.

Introduction

A dispersion system is a mixed system formed by dispersing one or more substances into another substance, including emulsification of liquid-liquid dispersion Liquid, solid-liquid dispersed suspension and gas-liquid dispersed foam. The dispersion system has unique physical and chemical properties and is widely used in petroleum, chemical, food, pharmaceutical, ceramics, coatings, pigments, electricity Almost all industrial fields such as pools and vaccines. The dispersion system is a thermodynamically unstable system, as particles of the dispersed phase (liquid particles, solids Particles or bubbles) after being dispersed into the continuous phase, there will be weak physical interaction between the particles and the continuous phase, or between the particles and the particles. Strong charge attraction action, thereby forming flocculation or coalescence; while the specific gravity of different substances in the dispersion system is different, it is affected by gravity for a long time Placed between, there will be precipitation or floating of particles. These instability phenomena will have a significant impact on the final quality of the product, affecting the storage of the product between. Therefore, under the actual storage conditions, it is very important to quickly determine the long-term stability of the dispersion system in the shortest time. Static multiple light scattering (SMLS) technology can qualitatively and quantitatively analyze the instability of dispersion systems without diluting samples Such as floating, sedimentation, flocculation, coalescence, etc., by detecting the initial changes of these instability phenomena to shorten the time of the stability test [1], It is very important to predict the shelf life of products and infer the mechanism of system instability. This technology can achieve direct measuring. Evaluation of stability of particle dispersion system Static multiple light scattering

1 Scope

This standard specifies the method for evaluating the stability of dispersion systems using the principle of static multiple light scattering, including principles and methods, measurement systems, Measurement system verification and calibration, measurement and test reports. This standard applies to dispersion systems with a particle size of 50 nm to 1 mm, a volume fraction of 0.01% to 60%, and dispersions of other concentrations Department can refer to the implementation.

2 Terms and definitions

The following terms and definitions apply to this document. 2.1 Disperse system A mixed system is formed by dispersing one or more particulate materials into a fluid material. The former substance is called dispersion Phase, the latter substance is called continuous phase or dispersion medium. 2.2 Dispersion system stability The dispersion state of the particles in the dispersion system changes with time. 2.3 Static multiple light scattering When the light enters the sample containing the dispersion system, the dispersed particles are scattered multiple times. Note. The particles in the sample can be solid particles, droplets, bubbles and other substances. 2.4 Photon mean free path The average distance between two particles where two adjacent scattering occurs. 2.5 Photonpropagationmeanfreepath The average free path in anisotropic media. 2.6 Instability index A measure of the stability of a dispersion system. Note. The change intensity is the most stable when it is 0, the larger the change value, the more unstable.

3 Symbols and abbreviations

3.1 Symbol The following symbols apply to this document. d. particle diameter ......

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