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Related Concept Videos

Chemical Formulas02:52

Chemical Formulas

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A chemical formula presents information about the proportions of atoms constituting a particular chemical compound or molecule, mainly using symbols of elements and numbers. At times other symbols, such as dashes, parentheses, brackets, commas, plus, and minus signs, are also used. A chemical formula can be one of three types – molecular, empirical, and structural.
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Chemical Equations03:10

Chemical Equations

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Chemical equations represent the identities and relative quantities of substances involved in a chemical reaction. The substances undergoing reaction are called reactants, and their formulas are placed on the left side of the equation. The substances generated by the reaction are called products, and their formulas are placed on the right side of the equation. Plus signs (+) separate individual reactant and product formulas, and an arrow (→) separates the reactant and product (left and right)...
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Chemical Reactions01:19

Chemical Reactions

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A chemical reaction is a process by which the bonds in the atoms of substances are rearranged to generate new substances. Matter cannot be created or destroyed in a chemical reaction—the same type and number of atoms that make up the reactants are still present in the products. Merely, the rearrangement of chemical bonds produces new compounds.
Chemical Reactions Rearrange Atoms into New Substances
A chemical reaction takes starting materials—the reactants—and changes them...
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Chemical Reactions02:26

Chemical Reactions

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A balanced chemical equation provides the information of chemical formulas of the reactants and products involved in the chemical change. A reaction’s stoichiometry helps predict how much of the reactant is needed to produce the desired amount of product, or in some cases, how much product will be formed from a specific amount of the reactant.
The relative amounts of reactants and products represented in a balanced chemical equation are often referred to as stoichiometric amounts. However, in...
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Types of Chemical Bonds02:37

Types of Chemical Bonds

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Chemical bonding theories were pioneered by American chemist Gilbert N. Lewis. He developed a model called the Lewis model to explain the type and formation of different bonds. Chemical bonding is central to chemistry; it explains how atoms or ions bond together to form molecules. It explains why some bonds are strong and others are weak, or why one carbon bonds with two oxygens and not three; why water is H2O and not H4O. 
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Physical and Chemical Properties of Matter02:57

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The characteristics that enable us to distinguish one substance from another are called properties.
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Chemically Induced Sintering of Nanoparticles.

Zheng Li1, Kenneth S Suslick1

  • 1Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S Matthews Ave, Urbana, IL, 61801, USA.

Angewandte Chemie (International Ed. in English)
|August 4, 2019
PubMed
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We discovered that silver nanoparticles (AgNPs) can detect trace reactive gases at room temperature. This novel colorimetric sensor technology offers ultrasensitive detection of airborne pollutants.

Keywords:
colorimetric sensor arraysgas-solid reactionnanoparticle sensorssinteringultrasensitive dosimetry

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Area of Science:

  • Nanomaterials Science
  • Analytical Chemistry
  • Environmental Monitoring

Background:

  • Silver nanoparticles (AgNPs) exhibit unique optical properties due to localized surface plasmon resonances (LSPRs).
  • Trace reactive gases pose significant environmental and health risks, necessitating sensitive detection methods.

Purpose of the Study:

  • To investigate the solid-state growth of AgNPs induced by reactive gases.
  • To develop a novel colorimetric sensor array for ultrasensitive detection and dosimetry of reactive gases.

Main Methods:

  • Exposure of printed AgNP sensor spots to trace concentrations of reactive gases at room temperature.
  • Monitoring changes in visible absorbance due to altered LSPRs.
  • Utilizing colorimetric sensor arrays and chemometric analysis for gas identification.

Main Results:

  • Observed solid-state growth of AgNPs upon exposure to trace reactive gases (ppb levels).
  • Demonstrated a novel mechanism for trace gas detection and dosimetry via altered AgNP absorbance.
  • Achieved limits of detection below ppb levels for 1-hour exposures.
  • Developed colorimetric sensor arrays with unique color patterns for 11 different reactive gases.
  • Showcased excellent discrimination among analytes using chemometric methods.

Conclusions:

  • Chemically induced sintering of AgNPs provides a new pathway for solid-state gas sensors.
  • The developed AgNP-based sensor arrays enable ultrasensitive detection of reactive gases.
  • This technology holds promise for monitoring trace airborne pollutants.