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Related Concept Videos

MOS Capacitor01:25

MOS Capacitor

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A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
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Phase Transitions: Sublimation and Deposition02:33

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Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Network Covalent Solids02:18

Network Covalent Solids

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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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Phase Diagrams02:39

Phase Diagrams

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A phase diagram combines plots of pressure versus temperature for the liquid-gas, solid-liquid, and solid-gas phase-transition equilibria of a substance. These diagrams indicate the physical states that exist under specific conditions of pressure and temperature and also provide the pressure dependence of the phase-transition temperatures (melting points, sublimation points, boiling points). Regions or areas labeled solid, liquid, and gas represent single phases, while lines or curves represent...
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Metallic Solids02:37

Metallic Solids

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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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Dispersive solid-phase extraction based on MoS

Sheying Dong1,2, Qi Lou3, Guiqi Huang3

  • 1College of Sciences, Xi'an University of Architecture and Technology, Xi'an, 710055, Shaanxi, China. dongsyy@126.com.

Analytical and Bioanalytical Chemistry
|September 12, 2018
PubMed
Summary

A new method uses molybdenum disulfide and carbon dots for solid-phase extraction to detect brominated flame retardants in water. This technique offers high recovery and low detection limits for environmental analysis.

Keywords:
Brominated flame retardantsCarbon dotsDeterminationDispersive solid-phase extractionMoS2

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Area of Science:

  • Analytical Chemistry
  • Environmental Science
  • Materials Science

Background:

  • Brominated flame retardants (BFRs) are widely used but pose environmental and health risks.
  • Accurate detection of BFRs in water samples is crucial for environmental monitoring.
  • Existing methods may lack efficiency or sensitivity for trace-level BFR analysis.

Purpose of the Study:

  • To develop a novel dispersive solid-phase extraction (DSPE) method for BFR determination.
  • To utilize a molybdenum disulfide/carbon dot (MoS2/CD) composite as an efficient sorbent material.
  • To combine DSPE with high-performance liquid chromatography (HPLC) for sensitive BFR analysis.

Main Methods:

  • Synthesis of MoS2/CD composite material.
  • Optimization of DSPE parameters for BFR extraction.
  • Analysis of BFRs using HPLC.

Main Results:

  • The MoS2/CD composite demonstrated excellent extraction performance for BFRs.
  • The developed DSPE-HPLC method achieved high recovery rates (80-91%).
  • Low limits of detection (0.01-0.06 μg/L) and low relative standard deviations (<6.5%) were obtained.

Conclusions:

  • The MoS2/CD composite is a promising sorbent for DSPE of BFRs.
  • The developed method is effective for the trace-level determination of BFRs in real water samples.
  • This approach offers a sensitive and reliable tool for environmental monitoring of BFRs.