{"id":290,"date":"2018-03-31T12:09:39","date_gmt":"2018-03-31T17:09:39","guid":{"rendered":"http:\/\/www.nano-blog.com\/?p=290"},"modified":"2022-09-02T13:04:48","modified_gmt":"2022-09-02T18:04:48","slug":"changes-in-nanotechnology-perspectives","status":"publish","type":"post","link":"http:\/\/www.nano-blog.com\/?p=290","title":{"rendered":"Changes in Nanotechnology Perspectives"},"content":{"rendered":"

There are announcements about new findings or new concepts in nanotechnology that may not appear a \u201cbig\u201d changes.\u00a0 Typically, the definition of nanomaterials is: For a material to be called nanomaterial, its size must be smaller than 100 nm in at least one of the dimensions, or a nanomaterial should consist for 50 % or more of particles having a size between 1 nm-100 nm.\u00a0 A comment in the latest imec<\/strong> magazine issue [Ref. 1] adds a little more clarity: \u201cWhat makes these nanoparticles special, is that their properties cannot simply be derived from their bulk counterparts due to quantum physics effects. There is a direct effect of size on several physical and chemical properties.<\/em>\u201d<\/p>\n

\u201cWhy the hazardous properties can be different is because the charge density on the surface is different. Since nanoparticles are smaller than bigger particles, the surface is more curved and the charge density is larger. Additionally, their free energy is larger, which can change their catalytic activity. Finally, the number of atoms touching the skin – the first layer of contact – as a percentage is larger than with larger particles. Some of the nanomaterial properties change in a predictable way, others in a threshold way.\u201d [Ref. 2] But article also states: \u201cWhat is important for us is the size threshold, so that similar materials can be treated the same way.\u201d<\/p>\n

As long time readers of this blog may remember, size makes a large difference in many different ways.\u00a0 The transition of aluminum nanoparticles as a size boundary is crossed.\u00a0 The ability of gold nanoparticles to change colors based on size.\u00a0 The ability of silver to kill bacteria as size decreases past a threshold value.\u00a0\u00a0\u00a0 The effects can be different even for nanomaterials in the same periodic group,<\/p>\n

The above quotes are from an article published by imec<\/strong> in their monthly magazine describing an effort to create understanding of nanotechnology safety in Europe among their semiconductor manufacturing workers.\u00a0 The US has funded two distinct efforts on nanotechnology safety to provide an education source for both workers and students.\u00a0 The educational aspects of nanotechnology safety are addressed in an Introductory Course and an Advanced Course funded by NSF at the Texas State University. [Ref. 3]\u00a0 This effort has produced a textbook on nanotechnology safety. [Ref. 4] \u00a0OSHA funded an earlier effort at Rice University that developed an eight-hour training course for workers in various industries. [Ref. 5] \u00a0(Disclaimer: the author of the blog was involved in the three items referenced immediately above.)<\/p>\n

There is new modeling work that describes the ability to create new materials that have unusual properties.\u00a0 The issue is that developing a model and manufacturing the modeled structure are not straightforward.\u00a0 Next month, this blog is planning covering the latest information on the modeling efforts.<\/p>\n

Reference:<\/strong><\/p>\n

    \n
  1. https:\/\/www.imec-int.com\/en\/imec-magazine\/imec-magazine-april-2018\/assessing-nanorisks-in-the-semiconductor-industry<\/a><\/li>\n
  2. Quote by Dimiter Prodanov in Ref. 1.<\/li>\n
  3. http:\/\/nsf-nue-nanotra.engineering.txstate.edu\/curriculum.html<\/li>\n
  4. Nano-Safety, Dominick Fazarro, Walt Trybula, Jitendra Tate, Craig Hanks, De Gruyter Publisher 2017, ISBN 978-3-11-037375-2<\/li>\n
  5. \u201cINTRODUCTION TO NANOMATERIALS AND OCCUPATIONAL HEALTH\u201d available at https:\/\/www.osha.gov\/dte\/grant_materials\/fy10\/sh-21008-10\/1-introduction.pptx<\/a><\/li>\n<\/ol>\n

     <\/p>\n","protected":false},"excerpt":{"rendered":"

    There are announcements about new findings or new concepts in nanotechnology that may not appear a \u201cbig\u201d changes.\u00a0 Typically, the definition of nanomaterials is: For a material to [..]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14,9],"tags":[],"class_list":["post-290","post","type-post","status-publish","format-standard","hentry","category-misc-ramblings","category-nano"],"_links":{"self":[{"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=\/wp\/v2\/posts\/290","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=290"}],"version-history":[{"count":1,"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=\/wp\/v2\/posts\/290\/revisions"}],"predecessor-version":[{"id":291,"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=\/wp\/v2\/posts\/290\/revisions\/291"}],"wp:attachment":[{"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=290"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=290"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.nano-blog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=290"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}