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Related Concept Videos

Alkali Metals03:06

Alkali Metals

24.9K
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
24.9K
Bonding in Metals02:32

Bonding in Metals

52.6K
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”. 
52.6K
Metallic Solids02:37

Metallic Solids

20.8K
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....
20.8K
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

557
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
557
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

24.4K
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

30.0K
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.
30.0K

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3D Printing - Evaluating Particle Emissions of a 3D Printing Pen
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3D Printing - Evaluating Particle Emissions of a 3D Printing Pen

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Note: A 3D-printed alkali metal dispenser.

E B Norrgard1, D S Barker2, J A Fedchak2

  • 1Joint Quantum Institute, National Institute of Standards and Technology and University of Maryland, Gaithersburg, Maryland 20899, USA.

The Review of Scientific Instruments
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

We developed a new lithium (Li) atom source using 3D-printed titanium. This source efficiently loads over 10^7 atoms into a magneto-optical trap, ideal for deployable cold atom sensors.

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Area of Science:

  • Atomic physics
  • Materials science
  • Sensor technology

Background:

  • Cold atom sensors require efficient atom sources.
  • Traditional sources can be bulky or have limitations.

Purpose of the Study:

  • To demonstrate and characterize a novel lithium atom source.
  • To assess its suitability for deployable cold atom sensors.

Main Methods:

  • Direct metal laser sintering (DMLS) of titanium to create the source.
  • Measurement of the source's outgassing rate at 330 °C.
  • Loading of lithium-7 (7Li) atoms into a magneto-optical trap (MOT).

Main Results:

  • The titanium source exhibits an outgassing rate of 5(2) × 10^-7 Pa L s^-1.
  • Optimized loading temperature is 330 °C.
  • The source loads approximately 10^7 7Li atoms into the MOT in about 1 second.
  • The loaded source weighs 700 mg.

Conclusions:

  • The DMLS titanium source is a viable and efficient source for Li atoms.
  • Its compact size and loading efficiency make it suitable for deployable cold atom sensors.