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Related Concept Videos

Metallic Solids02:37

Metallic Solids

20.9K
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....
20.9K
Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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The Nucleosome Core Particle02:10

The Nucleosome Core Particle

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Nucleosomes are the DNA-histone complex, where the DNA strand is wound around the histone core. The histone core is an octamer containing two copies of H2A, H2B, H3, and H4 histone proteins.
The paradox
Nucleosomes, paradoxically, perform two opposite functions simultaneously. On the one hand, their main responsibility is to protect the delicate DNA strands from physical damage and help achieve a higher compaction ratio. While on the other hand, they must allow polymerase enzymes to access DNA...
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Bonding in Metals02:32

Bonding in Metals

52.8K
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”. 
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Factors Affecting Dissolution: Particle Size and Effective Surface Area01:23

Factors Affecting Dissolution: Particle Size and Effective Surface Area

1.7K
Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
1.7K
Alkali Metals03:06

Alkali Metals

25.0K
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
25.0K

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Engineering Antiviral Agents via Surface Plasmon Resonance
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Localized Surface Plasmon Resonance Sensor Based at Metallic Sphere Dimer Particle.

Jiang-Yan Li

    Journal of Nanoscience and Nanotechnology
    |April 25, 2018
    PubMed
    Summary

    Silver and SiO₂ nanostructures exhibit localized surface plasmon resonance, with silver showing superior electric field enhancement. These findings are crucial for developing advanced biochemical sensors and localized field enhancement devices.

    Keywords:
    Localized Surface Plasmon ResonanceSensorMetallic Dimer Nanoparticle

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    Area of Science:

    • Nanophotonics
    • Plasmonics
    • Optical metamaterials

    Background:

    • Localized Surface Plasmon Resonance (LSPR) is a key phenomenon in nanophotonics.
    • Dimer nanoparticles and nanoshells offer tunable optical properties.
    • Sensitivity to refractive index changes is critical for sensor applications.

    Purpose of the Study:

    • To simulate and analyze the transmission spectrums of silver and SiO₂ dimer nanoparticles and nanoshell structures.
    • To investigate the influence of Localized Surface Plasmon Resonance (LSPR) on transmission dips.
    • To compare the electric field enhancement and localization properties of different nanostructures.

    Main Methods:

    • Finite-Difference time-Domain (FDTD) method for electromagnetic simulations.
    • Analysis of transmission spectrums for silver and SiO₂ nanostructures.
    • Calculation of refractive index sensitivity and electric field enhancement.

    Main Results:

    • Transmission dips observed in the visible range for silver nanostructures due to LSPR excitation.
    • High refractive index sensitivity of approximately 80 nm RIU⁻¹ for silver dimer nanoparticles.
    • Silver dimer nanoparticles demonstrate superior electric field enhancement and localization compared to SiO₂ counterparts.

    Conclusions:

    • Silver dimer nanoparticles and nanoshells exhibit significant LSPR effects with high sensitivity.
    • The enhanced electric field properties of silver nanostructures make them promising for sensor applications.
    • These nanostructures hold potential for designing advanced biochemical sensor devices and localized field enhancement applications.