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An oxygen-based nucleophile, like water, can undergo addition reactions with aldehydes and ketones. The reaction leads to the formation of hydrates, also referred to as 1,1-diols or geminal diols.
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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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The hydration of cement is an exothermic reaction in which heat is generated as cement hydrates. This heat of hydration is critical to cement's strength development. The rate at which this heat is generated affects the temperature rise, with a majority of the heat being released early in the hydration process, half within the first three days, and about 75% within the first week.
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Probing diffusion dynamics during hydrate formation by high field NMR relaxometry and diffusometry.

Linn W Thrane1, Joseph D Seymour2, Sarah L Codd1

  • 1Department of Mechanical and Industrial Engineering, Montana State University, Bozeman, MT 59717, United States.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
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High-field nuclear magnetic resonance (NMR) techniques effectively monitored hydrate formation in water droplets. This study reveals insights into molecular dynamics and evolving porous structures during phase transitions.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Chemical Engineering

Background:

  • Understanding phase transitions in multiphase systems is crucial for various industrial applications.
  • Hydrate formation dynamics, particularly in dispersed systems, require advanced characterization techniques.
  • Molecular dynamics during hydrate growth influence system properties and require detailed investigation.

Purpose of the Study:

  • To monitor molecular dynamics during hydrate formation in water droplets.
  • To investigate the evolution of porous hydrate agglomerates using advanced NMR methods.
  • To correlate NMR measurements with the physical changes occurring during hydrate growth.

Main Methods:

  • Employed high-field Nuclear Magnetic Resonance (NMR) relaxometry and diffusometry.
  • Utilized Magnetic Resonance Imaging (MRI) for spatially resolved hydrate formation analysis.
  • Conducted 1D T2 relaxation, spectrally resolved diffusion, and 2D T1-T2 correlation experiments.

Main Results:

  • 1D T2 relaxation indicated hydrate formation extent and water droplet size reduction.
  • MRI and T2 maps revealed heterogeneous and spatially dependent hydrate formation rates.
  • Diffusion measurements showed reduced porosity with increasing hydrate shell thickness; novel signal rise indicated complex diffusion dynamics.

Conclusions:

  • High-field NMR is capable of monitoring hydrate growth and phase transition molecular dynamics.
  • The evolution of the porous hydrate agglomerate structure can be characterized by NMR.
  • NMR techniques provide detailed insights into the complex interplay of relaxation and diffusion during hydrate formation.