Literature Review - Niumag

Academic Achievements

Literature Review | Professor Xu Li's Team at Beijing Jiaotong University Journal of Hydrology: Characterization of Pore Water Distribution Characteristics in Silty Clay During Compaction, Saturation, and Drying Processes Based on Nuclear Magnetic Resonance Technology Characterizing pore water distribution (PWD) is essential for understanding the hydraulic and mechanical behavior of unsaturated soil. This study employs Low-Field Nuclear Magnetic Resonance (NMR) relaxometry to quantitatively investigate the PWD evolution in compacted silty clay under varying compaction degrees, initial water contents, and drying processes. By calibrating the T₂ relaxation time against Mercury Intrusion Porosimetry (MIP) data, we established a robust conversion model to transform NMR signal amplitudes into pore water volume across specific pore radii. The results delineate three distinct pore water categories: adsorbed water (<0.05 μm), intra-aggregate water (0.05–1.0 μm), and inter-aggregate water (>1.0 μm). Furthermore, by integrating the Young-Laplace theory with cumulative pore water distribution curves derived from NMR, we propose two predictive methods (Saturated Cumulative Curve Method and Unsaturated Envelope Method) for estimating the Soil-Water Characteristic Curve (SWCC) across a wide suction range. This study demonstrates that low-field NMR is a powerful technique for non-destructive, quantitative monitoring of pore fluid dynamics in geotechnical applications.

Literature Review | Associate Professor Fanghui Fan's Team at Shenzhen University: Low-Field Time-Domain Nuclear Magnetic Resonance Facilitates Quality Control of Frozen Fish Balls – Analyzing the Cryoprotective Mechanism of Short-Chain Polypeptides Based on Relaxation and Imaging Associate Professor Fanghui Fan's Team at Shenzhen University: Low-Field Time-Domain Nuclear Magnetic Resonance Facilitates Quality Control of Frozen Fish Balls – Analyzing the Cryoprotective Mechanism of Short-Chain Polypeptides Based on Relaxation and Imaging

Empowering Intelligent Polymer Manufacturing: Low-Field Time-Domain NMR Enables Minute-Level Quality Control of Dynamic Phase Composition and Chain Mobility in EMAA Ionomers This article introduces the application of low-field time-domain nuclear magnetic resonance (TD-NMR) technology in polymer manufacturing, specifically focusing on EMAA ionomers. Traditional characterization methods struggle to provide in-situ, rapid analysis of polymers in the molten state, particularly within high-viscosity systems. By integrating the CPMG pulse sequence with a three-component fitting model, low-field TD-NMR enables the rapid resolution of dynamic phase composition in melts within approximately one minute. It distinguishes between low-, intermediate-, and high-mobility phases, quantitatively obtaining parameters for phase content and chain mobility. The research demonstrates that this technology clearly reveals the impact of factors like the degree of neutralization and plasticizers on phase structure and flow properties. It provides a microscopic basis for formulation optimization and process control, facilitating a shift in polymer R&D from "trial-and-error" to "directed design" and enabling minute-level quality control.

Literature Interpretation | Shandong University Sun Dejun Team《Colloids and Surfaces A: Physicochemical and Engineering Aspects》：Moisture Distribution Characterization of Oil-Based Drilling Fluids Based on Low-Field Nuclear Magnetic Resonance Technology

Literature Insight | Professor Zhao Yu’s Team at Guizhou University: Damage Evolution Induced by Fluid Infiltration Under Varying Injection Rates — Insights from NMR-Based Hydraulic Fracturing Experiments In this study, hydraulic fracturing was performed on cylindrical sandstone samples at varying injection rates using a self-developed experimental system that integrates Nuclear Magnetic Resonance (NMR) and hydraulic fracturing. The results indicate that low injection rates primarily cause damage at the macropore scale, whereas high injection rates tend to promote micropore-scale damage. This may be attributed to the adsorption-induced swelling of clay minerals within the pore spaces.

Literature Interpretation | Development and Validation of a Multi-field Interaction Imaging Detection System Based on LF-NMR

Literature Interpretation | Professor Pan Zhejun's team from Northeast Petroleum University and Associate Professor Du Yi's team from Northwest University《Application of nuclear magnetic resonance technology in reservoir characterization and CO2 enhanced recovery for shale oil: A review》：Application Overview of Nuclear Magnetic Resonance Technology in Shale Oil Reservoir Characterization and CO₂-Enhanced Oil Recovery (EOR)

Literature Review|Professor Lin Shengcai's Research Team at Xiamen University《Lithocholic acid phenocopies anti-ageing effects of calorie restriction》：Low-field NMR Technology Assists in the Study of the Anti-aging Effects of Lithocholic Acid Mimicking Caloric Restriction

Literature Interpretation | Professor Chen Zheng's Team, School of Civil Engineering, Guangxi University《Composites part B》：Effect of Loading on the Internal Water Distribution and Migration of Hardened Cement Paste with Different Water Contents

[Literature Review] Dynamic LF-NMR Analysis of the Effect of Shrinkage Reducing Agents on Water Migration and Pore Structure in Cement-Based Grouting Materials

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