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Efficiency of Liquid-liquid Extraction09:21

Efficiency of Liquid-liquid Extraction

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Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA
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Band broadening in a chromatography column is measured by its efficiency. This is determined by the number of theoretical plates (N). Theoretical plate theory states that a separation column consists of a continuous series of imaginary plates where solute equilibration occurs between stationary and mobile phases.
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In ordinary chemical reactions, the nucleus — which contains the protons and neutrons of each atom and thus identifies the element — remains unchanged. Electrons, however, can be added to atoms by transfer from other atoms, lost by transfer to other atoms, or shared with other atoms. The transfer and sharing of electrons among atoms govern the chemistry of the elements. During the formation of some compounds, atoms gain or lose electrons to form electrically charged particles called...
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Liquid-liquid Extraction and York-Scheibel Column Operation
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Efficient Charge Extraction from CdSe/ZnSe Dots-on-Plates Nanoheterostructures.

Sushma Yadav1, Buban Adhikary1, Puspanjali Tripathy1

  • 1Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India.

ACS Omega
|August 29, 2019
PubMed
Summary

Researchers developed new CdSe/ZnSe dots-on-plates (DoPs) heterostructures for efficient electron extraction. These materials enable selective charge separation, overcoming limitations of CdSe nanoplatelets for advanced device applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Dots

Background:

  • CdSe nanoplatelets (NPLs) exhibit short-lived excitons, hindering applications requiring charge separation.
  • Developing novel heterostructures is crucial for efficient charge extraction and tailored material properties.

Purpose of the Study:

  • To demonstrate efficient and selective charge extraction from novel CdSe/ZnSe dots-on-plates (DoPs) heterostructures.
  • To investigate the charge extraction mechanism in these quasi-type-II heterostructures.

Main Methods:

  • Fabrication of CdSe/ZnSe DoPs heterostructures.
  • Utilizing electron (benzoquinone) and hole (pyridine) quenching experiments.
  • Comparative analysis of charge extraction in DoPs versus NPLs.

Main Results:

  • Demonstrated selective electron extraction from CdSe/ZnSe DoPs, leaving holes within the nanostructures.
  • Observed more facile electron extraction from DoPs compared to NPLs.
  • Identified DoPs as promising candidates for applications requiring single-charge transport.

Conclusions:

  • CdSe/ZnSe DoPs heterostructures offer efficient and selective charge extraction.
  • These materials provide a viable alternative to CdSe NPLs for charge separation applications.
  • The quasi-type-II structure facilitates tailored charge dynamics for device development.