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Pulmonary Function Tests (PFTs)
Pulmonary Function Tests are crucial diagnostic tools for assessing respiratory function, particularly in patients with chronic respiratory disorders. They comprehensively evaluate lung volumes, ventilatory function, breathing mechanics, diffusion, and gas exchange. These tests help diagnose pulmonary diseases and play a significant role in monitoring disease progression, evaluating disability, and assessing response to therapy.
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Metallic Solids02:37

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
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Various carboxylic acid derivatives (such as acid chlorides, esters, and anhydrides) can be used for the acylation of amines to yield amides. The reaction requires two equivalents of amines. The first amine molecule functions as a nucleophile and attacks the carbonyl carbon to produce a tetrahedral intermediate. This is followed by the loss of the leaving group and restoration of the C=O bond.
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Amine-Functionalized Clays as Solid Sorbents: High-Pressure CO2 Sorption Testing and Characterization.

Jennifer Narváez1, Ernesto Bastardo-González1, Edward E Ávila1

  • 1Grupo de Investigación Aplicada en Materiales y Procesos (GIAMP), School of Chemical Sciences and Engineering, Yachay Tech University, Hacienda San José s/n y Proyecto Yachay, Urcuquí 100119, Ecuador.

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Summary

Amine-functionalized clays show significantly enhanced carbon dioxide (CO2) sorption capacity, offering a promising solution for CO2 capture. This study explored Ecuadorian clays functionalized with monoethanolamine (MEA) and ethylenediamine (EDA) for improved CO2 mitigation.

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Rising atmospheric carbon dioxide (CO2) levels necessitate effective carbon capture technologies.
  • Clay-based materials are abundant and cost-effective sorbents.
  • Functionalization can enhance the CO2 affinity of porous materials.

Purpose of the Study:

  • To investigate the CO2 sorption capacity of raw and amine-functionalized clays from Ecuador.
  • To evaluate the impact of monoethanolamine (MEA) and ethylenediamine (EDA) functionalization on CO2 capture.
  • To assess the potential of these materials for industrial and artisanal CO2 mitigation applications.

Main Methods:

  • CO2 sorption testing in a high-pressure, non-stirred system at 3550 kPa and 25 °C.
  • Quantification of CO2 sorption capacity via pressure drop monitoring.
  • Characterization using nitrogen physisorption, XRD, FTIR, TGA, and XRF.

Main Results:

  • Amine-functionalized clays exhibited significantly higher CO2 sorption capacity, with improvements up to 442.85% compared to raw clays.
  • Artisanal-grade amine-functionalized clays achieved a maximum CO2 sorption capacity of 3.125 mmol CO2/g.
  • Characterization confirmed enhanced physicochemical properties and functional groups favoring CO2 capture in functionalized samples.

Conclusions:

  • Amine functionalization is a highly effective strategy for enhancing the CO2 sorption capacity of clay-based materials.
  • These functionalized clays present a viable and scalable alternative for mitigating atmospheric CO2 emissions.
  • The study highlights the potential of locally sourced Ecuadorian clays for carbon capture applications.