Monday, May 28, 2018

A novel method to grow elastic diamonds

Elasticity of Diamond
Elasticity of Diamond

A novel method to grow elastic diamonds

Elasticity of Diamond

Diamond is a crystallized form of carbon with a cubic crystal structure (a square or rhombus-shaped figure that is usually oriented with long diagonal vertical). At room temperature and pressure, it is metastatic and graphite is stable, but the diamond almost never changes into graphite. It is usually almost colorless when it is highly valued in the form of a precious stone free of transparency and error. This is the most naturally occurring material on earth. It is famous for its excellent physical properties, most of which arise from the strong covalent bond between its atoms. In particular, it has high hardness, extraordinary thermal conductivity, high chemical resistance, and high optical transparency of any bulk material.

These notable properties of the diamond determine many technical and industrial applications, for example cutting and polishing tools and scientific applications in diamond knives and diamond allele cells.

Ultra large elastic deformation of nanoscale diamond

In the last research, the Institute of Basic Sciences (IBS) and the Center for Multi-Dimensional Carbon Materials (CMCM) at Ulsan National Institute of Science and Technology (UNIST), in collaboration with Hong Kong City University, and Nanyang Technical University, jointly organized a study about the nature of the diamond and published their report in the journal "Science" this week.

The team has unveiled that brittle diamonds can be rotated and spread on a large scale when ultrafine needles are made. The team showed that their nanoscale diamond needle can flex and stretch up to nine percent without breaking, then return to its original size. Their discovery completely reverses the full principles that diamonds are brittle. Their results can open up unprecedented possibilities to tune their optical, optometric, magnetic, photonic, and catalytic properties through elastic tension engineering.

elastic diamonds
A novel method to grow elastic diamonds

According to the researchers, a percentage of a simple diamond in bulk form is below the stretch and diamond needles are flexed up to 9% without any breakage.

In the study, Professors of  Ming's group handled the analysis of chemical computation and diamond crystal structure and said that the ultrahigh elasticity of diamond nano nodes is due to internal defects and lack of relatively smooth surface. Diamonds, either natural or synthetic, have internal defects in their crystal structures when external forces are applied to these defects, they can crack and eventually break. The ultrasonic elasticity of diamonds is due to lack of internal defects.

The researchers determined how much stress and strain can be without breaking the diamond needles. He determined that the respective maximum local tension was close to the known theoretical boundary with a perfect, faultless diamond. They noted that without defective diamonds, 12% can spread without breaking. And large elastic deformation in needles of nanoscale diamonds will be suitable for use in the next generation's flexible and foldable display.

Researchers had hoped that their findings could lead to an increase in performance of applications including bio-imaging and bio-sensing, stress-intermediate nanomechanical resonators, drug delivery, data storage, and optometric devices as well as ultra-strength nanostructure. In addition, Professor Ding noted that large elastic deformation in needles of nanoscale diamonds would be suitable for use in the next generation's flexible and foldable display.

Researchers at the City University of Hong Kong succeeded in creating nanoscale diamond needles with plasma-induced etching of diamond thin films deposited on C substrates through bias-supported chemical vapor deposition. The team measured the inclination of diamond needles, which were grown through the process of a chemical vapor depositing and then with a standard nano pendant diamond tip, while pressing the needles, looking at them in the scanning electron microscope, Was carved. And they experimentally demonstrated that single-crystalline needles are highly susceptible to ultra-strong and large elastic deformation, in which there is a completely inverse mechanical disorder, up to 9% elastic tensile strain and stress.

No comments:

Post a Comment