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Related Concept Videos

Density00:56

Density

19.9K
Density is an important characteristic of substances, crucial in determining whether an object sinks or floats in a fluid. Its SI unit is kg/m3, and its cgs unit is g/cm3. The density of an object helps in identifying its composition, and also reveals information about the phase of the matter and its substructure. The densities of liquids and solids are roughly comparable, consistent with the fact that their atoms are in close contact. However, gases have much lower densities than liquids and...
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Current Density01:21

Current Density

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The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...
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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Strain-Energy Density01:20

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Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
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Bulk Density of Aggregate01:22

Bulk Density of Aggregate

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Bulk density refers to the mass of aggregate particles that would fill a unit volume. The concept of bulk density originates from the inability to pack aggregate particles in a manner that completely eliminates void spaces. Hence, the term bulk refers to the volume that encompasses both the aggregates and the voids. This measurement is crucial when aggregates are batched by volume and is used to convert quantities by mass to volume.
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Density and Archimedes' Principle01:05

Density and Archimedes' Principle

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When a lump of clay is dropped into water, it sinks. But if the same lump of clay is molded into the shape of a boat, it starts to float. Because of its shape, the clay boat displaces more water than the lump and experiences a greater buoyant force, even though its mass is the same. The same holds true for steel ships. The average density of an object majorly determines if the object will float. If an object's average density is less than that of the surrounding fluid, it will float. The...
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Related Experiment Video

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Quantification of Cellular Densities and Antigenic Properties using Magnetic Levitation
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High-Throughput Density Measurement Using Magnetic Levitation.

Shencheng Ge1, Yunzhe Wang1, Nicolas J Deshler1

  • 1Department of Chemistry & Chemical Biology , Harvard University , 12 Oxford Street , Cambridge , Massachusetts 02138 , United States.

Journal of the American Chemical Society
|June 12, 2018
PubMed
Summary
This summary is machine-generated.

This study presents a high-throughput magnetic levitation (MagLev) system for density measurements of various materials, including cells. The integrated system uses 96-well plates and a scanner for efficient, label-free analysis.

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Area of Science:

  • Analytical Chemistry
  • Biochemistry
  • Materials Science

Background:

  • Magnetic levitation (MagLev) offers density-based analysis but lacks high-throughput capabilities.
  • Current MagLev methods are not optimized for analyzing multiple samples simultaneously.
  • Label-free, density-based characterization is crucial for various scientific disciplines.

Purpose of the Study:

  • To develop an integrated, high-throughput analytical system for density measurements.
  • To adapt MagLev technology for compatibility with standard 96-well plates.
  • To enable label-free, density-based analysis of diverse diamagnetic materials, including biological cells.

Main Methods:

  • Re-engineered magnetic fields to enable MagLev in 96-well plates.
  • Integrated a flatbed scanner and optical components for sample imaging.
  • Utilized magnetic levitation for density determination of various diamagnetic samples.

Main Results:

  • Demonstrated successful high-throughput density measurements using the integrated MagLev system.
  • Validated the system's compatibility with both biological (human erythrocytes) and nonbiological samples (liquids, solids, powders, beads).
  • Achieved label-free density analysis based on magnetic levitation.

Conclusions:

  • The developed integrated MagLev system overcomes previous throughput limitations.
  • This technology enables novel applications in materials analysis, separation, and biochemical studies.
  • The system provides a simple, label-free method for density characterization using a universal property of matter.