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Related Concept Videos

Elements and Compounds01:27

Elements and Compounds

105.5K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond.
Elements
Elements are classified as atomic or molecular based on the nature of their basic units. They are unique forms of matter with specific chemical and physical properties that cannot break down into smaller substances by ordinary chemical reactions. There...
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Periodic Classification of the Elements04:00

Periodic Classification of the Elements

60.5K
The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Key Elements for Plant Nutrition02:35

Key Elements for Plant Nutrition

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Like all living organisms, plants require organic and inorganic nutrients to survive, reproduce, grow and maintain homeostasis. To identify nutrients that are essential for plant functioning, researchers have leveraged a technique called hydroponics. In hydroponic culture systems, plants are grown—without soil—in water-based solutions containing nutrients. At least 17 nutrients have been identified as essential elements required by plants. Plants acquire these elements from the...
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Classification of Elements and Compounds02:54

Classification of Elements and Compounds

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Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
73.9K
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

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A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
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The Periodic Table and Organismal Elements00:57

The Periodic Table and Organismal Elements

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Overview
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Using Graphene Liquid Cell Transmission Electron Microscopy to Study in Situ Nanocrystal Etching
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Using Graphene Liquid Cell Transmission Electron Microscopy to Study in Situ Nanocrystal Etching

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Nanometer Resolution Elemental Mapping in Graphene-Based TEM Liquid Cells.

Daniel J Kelly1, Mingwei Zhou1, Nick Clark1

  • 1School of Materials, ‡School of Physics and Astronomy, and §National Graphene Institute, University of Manchester , Oxford Road, Manchester, M13 9PL, United Kingdom.

Nano Letters
|January 12, 2018
PubMed
Summary
This summary is machine-generated.

We developed a new graphene liquid cell for high-resolution electron microscopy. This robust platform enables advanced imaging and elemental mapping of nanoparticles in liquid environments.

Keywords:
EDX spectrum imaginggraphene liquid cellsin situ TEMnanoparticlesvan der Waals heterostructures

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electron Microscopy

Background:

  • Liquid cell electron microscopy is crucial for studying dynamic processes in liquids.
  • Previous liquid cells faced limitations in resolution, stability, and analytical capabilities.

Purpose of the Study:

  • To develop a novel, robust graphene liquid cell for advanced transmission electron microscopy (TEM).
  • To enhance imaging and elemental analysis of nanomaterials in liquid environments.

Main Methods:

  • Fabrication of ultrathin liquid cells using graphene and hexagonal boron nitride.
  • Characterization using transmission electron microscopy (TEM).
  • Analysis of liquid content and cell thickness via electron energy loss spectroscopy (EELS).
  • Elemental mapping using energy dispersive X-ray spectroscopy (EDXS).

Main Results:

  • Demonstrated ultrathin, robust liquid cells with controlled volumes and thicknesses.
  • Confirmed water presence using EELS (oxygen K-edge).
  • Successfully imaged and tracked dynamic motion of 0.5-5 nm metal nanoparticles.
  • Achieved 1 nm spatial resolution elemental mapping of bimetallic nanoparticles using EDXS, an order of magnitude improvement.

Conclusions:

  • The new graphene liquid cell design offers a reliable platform for high-resolution in-situ liquid studies.
  • This technology significantly advances the analytical capabilities for nanomaterials in liquid, enabling detailed investigation of their behavior and composition.