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Related Concept Videos

Supercritical Fluid Chromatography01:18

Supercritical Fluid Chromatography

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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
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Social psychologists have documented that feeling good about ourselves and maintaining positive self-esteem is a powerful motivator of human behavior (Tavris & Aronson, 2008). In the United States, members of the predominant culture typically think very highly of themselves and view themselves as good people who are above average on many desirable traits (Ehrlinger, Gilovich, & Ross, 2005). Often, our behavior, attitudes, and beliefs are affected when we experience a threat to our...
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Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
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Rate laws describe the relationship between the rate of a chemical reaction and the concentration of its reactants. In a rate law, the rate constant k and the reaction orders are determined experimentally by observing how the rate of reaction changes as the concentrations of the reactants are changed. A common experimental approach to the determination of rate laws is the method of initial rates. This method involves measuring reaction rates for multiple experimental trials carried out using...
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The theoretical yield of a reaction is the amount of product estimated to form based on the stoichiometry of the balanced chemical equation. The theoretical yield assumes the complete conversion of the limiting reactant into the desired product. The amount of product that is obtained by performing the reaction is called the actual yield, and it may be less than or (very rarely) equal to the theoretical yield.
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The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
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Supercritical Nitrogen Processing for the Purification of Reactive Porous Materials
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Enhanced Reaction in Supercritical Inhomogeneous Microaggregation.

Junhao Guo1,2, Yutong Wang1,3, Guozhu Liu1,2

  • 1Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China.

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Supercritical fluids (SCFs) enhance chemical reactions by stabilizing transition states through liquid-like atom clusters. This mechanism shifts near the Widom line, impacting kinetic diffusion and reactivity in supercritical conditions.

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Area of Science:

  • Chemical Engineering
  • Physical Chemistry
  • Environmental Science

Background:

  • Supercritical fluids (SCFs) are vital in environmental, geological, and celestial processes due to unique properties influencing chemical reactions.
  • The modulation of reactions by SCFs is attributed to their inhomogeneous microscopic behavior, but the precise mechanisms remain unclear.

Purpose of the Study:

  • To elucidate how microscopic behaviors within SCFs influence chemical reactions.
  • To investigate reaction events under supercritical conditions (800-1000 K) using advanced computational methods.

Main Methods:

  • Metadynamics simulations were employed to model reaction events.
  • Free energy surface calculations were performed for probe reactions under supercritical conditions.

Main Results:

  • Liquid-like atoms and high-density clusters in SCFs enhance reactant collisions and stabilize transition states.
  • This enhancement mechanism is altered near the Widom line, with excess liquid-like atoms leading to limited kinetic diffusion upon further crossings.
  • A direct correlation between fluid microstructure and chemical reactivity was demonstrated.

Conclusions:

  • The study clarifies the link between SCF microstructure and chemical reactivity.
  • Findings provide a basis for optimizing industrial applications of SCFs by understanding their reaction modulation mechanisms.