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Application of a Portable Nuclear Magnetic Resonance Surface Probe to Porous Media

A portable nuclear magnetic resonance (NMR) surface probe was used to determine the time-dependent self-diffusion coefficient D(t) of water molecules in two fluid-filled porous media. The measuring equipment and the inhomogeneous magnetic fields in the sensitive volume of the probe are described. It is discussed how to evaluate D(t) using a surface probe from the primary and stimulated echoes generated in three-pulse experiments. Furthermore, …

Application of a Portable Nuclear Magnetic Resonance Surface Probe to Porous Media Read More »

Water Absorption Kinetics in Different Wettability Conditions Studied at Pore and Sample Scales in Porous Media by NMR with Portable Single-Sided and Laboratory Imaging Devices

NMR relaxation time distributions of water 1H obtained by a portable single-sided surface device have been compared with MRI internal images obtained with a laboratory imaging apparatus on the same biocalcarenite (Lecce Stone) samples during capillary water uptake. The aim of this work was to check the ability of NMR methods to quantitatively follow the absorption phenomenon under different wettability conditions of the …

Water Absorption Kinetics in Different Wettability Conditions Studied at Pore and Sample Scales in Porous Media by NMR with Portable Single-Sided and Laboratory Imaging Devices Read More »

Dynamics of ionic liquids in poly(vinyl alcohol) porous scaffold. Low field NMR study

In this study molecular dynamics of ionic liquids in poly(vinyl alcohol) scaffolds were investigated. The binary poly(vinyl alcohol) – ionic liquid (PVA-IL) compound was prepared from initial solutions of water, ionic liquid (IL) and poly(vinyl alcohol) (PVA) at different concentrations. Subsequently water was evaporated under open conditions, leaving the scaffold/IL system of interest. Low field nuclear magnetic resonance (NMR) relaxation and diffusion measurements, …

Dynamics of ionic liquids in poly(vinyl alcohol) porous scaffold. Low field NMR study Read More »

Single-sided NMR for the measurement of the degree of cross-linking and curing

The degree of cross-linking and curing is one of the most important values concerning the quality of cross-linked polyethylene (PE-X) and the functionality of adhesives and resin-based components. Up to now, the measurement of this property has mostly been time-consuming and usually destructive. Within the shown work the feasibility of single-sided nuclear magnetic resonance (NMR) …

Single-sided NMR for the measurement of the degree of cross-linking and curing Read More »

Spatially Resolved Measurements of Crosslinking in UV-Curable Coatings Using Single-Sided NMR

The UV-driven photocuring of coatings results in a crosslinked polymeric network. The degree of crosslinking in these coatings is typically assessed via optical spectroscopy; unfortunately, optical methods are typically limited in their maximum depth access. Alternatively, single-sided nuclear magnetic resonance (NMR) can be used to probe the crosslinking of UV-curable coatings in a spatially sensitive …

Spatially Resolved Measurements of Crosslinking in UV-Curable Coatings Using Single-Sided NMR Read More »

Single-Sided Nuclear Magnetic Resonance as a Non-Invasive Tool to Evaluate Sprayed Polymer Concrete

Single-sided nuclear magnetic resonance (NMR) is a powerful tool to evaluate building-material properties such as layer thickness, moisture content, and ageing. Due to its simple setup, it is potentially applicable on site. It is non-invasive with a high depth resolution and makes a number of parameters for planning and executing the rehabilitation of buildings as …

Single-Sided Nuclear Magnetic Resonance as a Non-Invasive Tool to Evaluate Sprayed Polymer Concrete Read More »

Nondestructive Quantification of Local Plasticizer Concentration in PVC by 1H NMR Relaxometry

The properties of plasticized poly(vinyl chloride) (PVC) , one of the most important polymers today, are strongly dictated by the concentration of plasticizer. Yet, it has been impossible to quantify this concentration at different positions inside a PVC product without its destruction because of a lack of suitable analytical methods. Thus, this paper introduces a …

Nondestructive Quantification of Local Plasticizer Concentration in PVC by 1H NMR Relaxometry Read More »

Investigation of the extraction process in gel-spinning technology for ultrahigh-molecular-weight polyethylene fibers by low-field nuclear magnetic resonance

A portable, low‐field nuclear magnetic resonance scanner, the nuclear magnetic resonance mobile universal surface explorer, is introduced as a tool for investigating the extraction process of mineral oil in the gel‐spinning technology of ultrahigh‐molecular‐weight polyethylene (UHMWPE) fibers. Factors affecting the extraction process were studied systematically; these included the UHMWPE type, extraction agent type, and concentration …

Investigation of the extraction process in gel-spinning technology for ultrahigh-molecular-weight polyethylene fibers by low-field nuclear magnetic resonance Read More »

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