What are Aggregated Diamond Nanorods?

Aggregated diamond nanorods (English: Aggregated diamond nanorods, also known as diamond nanorod polymers , referred to as ADNR ), is a nanocrystalline diamond, also known as nanodiamond or hyperdiamond.

Aggregated diamond nanorods (also known as aggregates of diamond nanorods, abbreviated as ADNR ), is a nanocrystalline form

The hardness of the <111> crystal plane of the pure diamond (the plane perpendicular to the diagonal of the cube) was 167 ± 6 GPa when tested with nanodiamonds, and the hardness of the nanodiamond sample itself was 310GPa when tested with nanodiamonds. However, this test can only give correct results if the scoring tool is harder than the test sample. In other words, the true hardness of nanodiamonds may be slightly less than 310 GPa.

Polymeric diamond nanorods can be made from compressed fullerite (fullerite, a solid form of fullerene) powder, similar to the method described above. One method uses a diamond pressure cavity and applies a pressure of about 37 GPa to it without heating. Another method is to compress the fullerene with a lower pressure (220 GPa) and then heat it to a temperature of 3002500 K. The ultra-high hardness of polymer diamond nanorods may have been reported by researchers in the 1990s. This material consists of a series of interconnected diamond nanorods, each with a diameter of 5 to 20

Polymer diamond nanorod carbon nanotubes

Carbon nanotubes (English: Carbon Nanotube, abbreviated as CNT) were discovered in January 1991 by Hiroo Iijima, a physicist at the NEC Laboratory in Tsukuba, Japan, using high-resolution transmission electron microscopy to produce carbon fibers from the arc method. It is a tubular carbon molecule. Each carbon atom on the tube adopts sp ² hybridization and is combined with each other by carbon-carbon bonds to form a honeycomb structure composed of hexagons as the skeleton of carbon nanotubes. A pair of p-electrons on each carbon atom that are not involved in hybridization form a conjugated -electron cloud across the entire carbon nanotube with each other. According to the number of layers of the tube, it is divided into single-walled carbon nanotubes and multi-walled carbon nanotubes. The radial direction of the tube is very thin, only nanometer-scale, and tens of thousands of carbon nanotubes are only one hair wide, which is why the name of the carbon nanotubes comes from. In the axial direction, it can reach tens to hundreds of microns.

Polymer Diamond Nanorod Fullerene

Fullerene is a hollow molecule composed entirely of carbon, which is spherical, ellipsoidal, cylindrical or tubular in shape. Fullerene is very similar in structure to graphite. Graphite is a stack of graphene layers consisting of six-membered rings. Fullerene contains not only six-membered rings but also five-membered rings, and occasionally seven-membered rings.

Polymer diamond nanorod diamond

Diamonds (Ancient Greek: ; French, German: Diamant ; English: Diamond ), chemically and industrially called diamonds . Diamond is a colorless crystal composed of carbon and is the hardest substance known to exist naturally.

Polymer Diamond Nanorods Mohs Hardness

Mohs hardness is a standard for dividing mineral hardness based on the relative scratch hardness of minerals. The standard was proposed by German mineralogist Friedrich Mohs (German: Friedrich Mohs) in 1812.

The Mohs hardness scale divides the hardness of ten common minerals into ten grades from small to large, namely (1) talc, (2) gypsum, (3) calcite, (4) fluorite, (5) apatite, (6 ) Feldspar, (7) quartz, (8) topaz, (9) corundum, (10) diamond. The specific identification method is to select a smooth surface on the mineral of unknown hardness and score it with one of the known minerals. If scratches appear on the surface of the unknown mineral, the hardness of the unknown mineral is less than that of the known mineral; Knowing that scratches appear on the surface of the mineral indicates that the hardness of the unknown mineral is greater than that of the known mineral. In this way, the relative hardness of the unknown mineral can be obtained in order.

If the hardness of a mineral is between two standard minerals, it will be expressed as .5, for example, the Mohs hardness of pyrite is 6.5.

It should be pointed out that Mohs hardness is a relative standard and has no proportional relationship with absolute hardness.

Polymer diamond nanorod superhard material

Superhard material refers to materials with extremely high hardness, which can be divided into natural and artificial. The former mainly includes natural diamond (diamond) and black diamond, and the latter includes polymer diamond nanorods (ADNR), chemical Vapor-deposited diamond (CVDD), and polycrystalline cubic boron nitride (PCBN), which are currently being studied more.