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Related Concept Videos

Noble Gases02:54

Noble Gases

22.7K

The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
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Alkali Metals03:06

Alkali Metals

24.5K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Bonding in Metals02:32

Bonding in Metals

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Metallic bonds are formed between two metal atoms. A simplified model to describe metallic bonding has been developed by Paul Drüde called the “Electron Sea Model”. 
52.3K
Metallic Solids02:37

Metallic Solids

20.6K
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.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.2K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
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Properties of Transition Metals02:58

Properties of Transition Metals

29.7K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
29.7K

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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Recent Developments in Detection Using Noble Metal Nanoparticles.

Xixi Zhao1, Haobin Zhao1, Lu Yan1

  • 1Key Laboratory for Space Bioscience and Biotechnology, School of Life Sciences, Northwestern Polytechnical University, Xi'an, Shaanxi Province, China.

Critical Reviews in Analytical Chemistry
|February 28, 2019
PubMed
Summary
This summary is machine-generated.

Noble metal nanoparticles (NPs), including silver (AgNPs) and gold (AuNPs), offer sensitive and selective detection methods. Their efficiency as biosensors depends on synthesis and properties, with applications in food, environmental, and biological fields.

Keywords:
Nanoparticlesapplicationsdetectionfabrication strategies

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Area of Science:

  • Nanotechnology
  • Analytical Chemistry
  • Materials Science

Background:

  • Noble metal nanoparticles (NPs), particularly silver (AgNPs) and gold (AuNPs), are valuable in biosensing due to their unique optical and electronic properties.
  • Their sensitivity, selectivity, ease of operation, and cost-effectiveness make them ideal for various detection applications.

Purpose of the Study:

  • To comprehensively review the current state of research on noble metal NPs in sensor development.
  • To consolidate findings on the synthesis, properties, and sensing mechanisms of AgNPs and AuNPs sensors.
  • To explore the applications of these sensors in food safety, environmental monitoring, and biological analysis.

Main Methods:

  • Literature review of reported studies on noble metal NPs for sensing.
  • Analysis of NP properties (shape, size) and their impact on sensor performance.
  • Categorization of sensing mechanisms based on colorimetric, fluorescent, and electrochemical characteristics.
  • Examination of sensor applications across different fields.

Main Results:

  • NP properties are highly dependent on synthesis methods and conditions, influencing sensor efficiency.
  • Sensing mechanisms leverage changes in colorimetric, fluorescent, or electrochemical signals upon analyte interaction.
  • AgNPs and AuNPs sensors demonstrate significant utility in detecting analytes in food, environmental, and biological samples.

Conclusions:

  • Noble metal NPs are versatile tools for developing highly sensitive and selective biosensors.
  • Further research into synthesis optimization and understanding structure-property relationships will enhance NP sensor capabilities.
  • Continued exploration of applications in critical areas like food safety and environmental monitoring is warranted.