Analysis of the indexed scientific productions related to the subject area of nanomaterials in the reference database of Web Of Science and drawing of a scientific map

ntroduction:

Nano materials are defined as materials with at least one dimension (length, width, thickness) below 100 nanometers, and one nanometer is one thousandth of a micron and about 100,000 times smaller than the diameter of a human hair. Physical and chemical properties of nanomaterials have fundamental differences compared to larger and microscopic materials. Nanotechnology is capable of reducing materials to such an extent that new materials and technologies can be offered to the world by regenerating them (Gol Afshani and Ghale Navi, 2018).

The purpose of this research is to examine scientific productions in the field of nanomaterials and to identify scientists, nuclear journals, productive countries and keywords with the most co-occurrence in this field.

Methodology: This research is of an applied type and was carried out with a scientometric approach. In order to extract the data, the wos advanced search section was used and the keyword "nano materials" was searched and 4637 records were retrieved. After refining and equalizing, the data were entered into scientific software and the desired maps were drawn. Bibliometrics software in R software was used to draw the maps.

Findings: The findings showed that a total of 4637 information records are indexed in this database. China ranks first with the production of 3459 information records, and the countries of India and the United States rank second and third with the production of 1370 and 884 information records. Iran also ranks fourth with the production of 589 information records. More than 95% of scientific productions are in English, and Chinese language ranks second with 166 information records. Islamic Azad University from Iran has taken the first place by producing 105 information records. The most frequent keyword related to nanomaterial is 847. Among the keywords of the indexed scientific records, the keywords nanoparticles and nanomaterials have the highest co-occurrence with 14 repetitions.

The indexed scientific records were divided into 5 clusters of nanomaterials, carbon nanotubes, mechanical properties, photocatalysis and carbon nanomaterials, and the carbon nanomaterials cluster has reached maturity. Photocatalyst clusters and mechanical properties are developed but distinct. Carbon nanotubes are located in the peripheral clusters (emerging or decaying) and finally, the nanomaterials cluster is located in the central but underdeveloped clusters. .



Methods: This research is applied and was carried out with a scientometric approach. In order to extract the data, the wos advanced search section was used and the keyword "nano materials" was searched and 4637 records were retrieved. After refining and equalizing, the data were entered into scientific software and the desired maps were drawn. Bibliometrix package in R software was used to illustrate the maps.

Findings: The findings showed that a total of 4637 information records are indexed in this database. China ranks first with the production of 3459 information records, and the countries of India and the United States rank second and third with the production of 1370 and 884 information records. Iran also ranks fourth with the production of 589 information records. More than 95% of scientific productions are in English, and the Chinese language ranks second with 166 information records. Islamic Azad University from Iran first produced 105 information records. The most frequent keyword related to nanomaterial is 847. Among the keywords of the indexed scientific records, the keywords nanoparticles and nanomaterials have the highest co-occurrence with 14 repetitions.

The indexed scientific records were divided into 5 clusters of nanomaterials, carbon nanotubes, mechanical properties, photocatalysis, and carbon nanomaterials, and the carbon nanomaterials cluster has reached maturity. Photocatalyst clusters and mechanistic properties are developed but distinct. Carbon nanotubes are located in the peripheral clusters (emerging or decaying) and finally, the nanomaterials cluster is located in the central but underdeveloped clusters. Therefore, despite the history of more than 30 years, this field of technology still has a lot of work to do.