{"id":1301,"date":"2021-12-08T00:28:07","date_gmt":"2021-12-07T23:28:07","guid":{"rendered":"https:\/\/lms.nanoproject.eu\/lms\/?post_type=unit&p=1301"},"modified":"2021-12-08T00:28:07","modified_gmt":"2021-12-07T23:28:07","slug":"the-basic-starting-point","status":"publish","type":"unit","link":"https:\/\/lms.nanoproject.eu\/lms\/unit\/the-basic-starting-point\/","title":{"rendered":"The basic starting point"},"content":{"rendered":"

What are the potential dangers of nanomaterials<\/strong><\/p>\n

Nanotechnologists work with matter of 1 nm to 999 nm in size. However, in recent years, the concept of nanomaterial has been used to denote only a tenth of the nanoscale dimension – from 1 nm to 100 nm. One of the principal reasons why the dimension of 1 nm to 100 nm was singled out for the definition of nanomaterials was the safety concern. Particles in the range of one to tens of nanometers can penetrate cells of the human body. Particles of hundreds of nanometers in size lack such ability, i.e. they cannot penetrate through the cell wall. Therefore, a lot of directives, decrees, and regulations stipulating restrictions and enhanced control of nanomaterials are, as a precautionary principle, focused on the 1 nm to 100 nm dimension.<\/p>\n

The simplification based on the fact that physicochemical properties of solid substances are not the same inside the material and on its surface. When particles of a material are reduced below 100 nm, the physicochemical properties of the surface prevail over the properties of the material and the particle starts to behave as if it was composed of the surface in its entirety. Particularly important are the intermolecular and other forces that act on dimensions in the range of tens of nanometers. Thus, nanomaterials can have different proprieties than the same material at a larger scale such as the microscale.<\/p>\n\n\n\n\n
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Definition<\/strong><\/p>\n<\/td>\n<\/tr>\n

Nanomaterials<\/strong><\/p>\n

On 18 October 2011, the European Commission issued the Recommendation 2011\/696\/EU on the definition of nanomaterial. According to the adopted definition, \u201ca nanomaterial means a natural, incidental or manufactured material containing particles, in an unbound state or as an aggregate or as an agglomerate and where, for 50 % or more of the particles in the number size distribution, one or more external dimensions is in the size range 1 nm-100.\u201d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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