{"id":137935,"date":"2022-04-10T11:04:32","date_gmt":"2022-04-10T16:04:32","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2022\/04\/revisiting-edge-sites-of-%ce%b3-al2o3-using-needle-shaped-nanocrystals-and-recoupling-time-encoded-27al-1h-d-hmqc-nmr-spectroscopy"},"modified":"2022-04-10T11:04:32","modified_gmt":"2022-04-10T16:04:32","slug":"revisiting-edge-sites-of-%ce%b3-al2o3-using-needle-shaped-nanocrystals-and-recoupling-time-encoded-27al-1h-d-hmqc-nmr-spectroscopy","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2022\/04\/revisiting-edge-sites-of-%ce%b3-al2o3-using-needle-shaped-nanocrystals-and-recoupling-time-encoded-27al-1h-d-hmqc-nmr-spectroscopy","title":{"rendered":"Revisiting Edge Sites of \u03b3-Al2O3 Using Needle-Shaped Nanocrystals and Recoupling-Time-Encoded {27Al}-1H D-HMQC NMR Spectroscopy"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/revisiting-edge-sites-of-ceb3-al2o3-using-needle-shaped-nanocrystals-and-recoupling-time-encoded-27al-1h-d-hmqc-nmr-spectroscopy3.jpg\"><\/a><\/p>\n<p>Despite being widely used in numerous catalytic applications, our understanding of reactive surface sites of high-surface-area \u03b3-Al2O3 remains limited to date. Recent contributions have pointed toward the potential role of highly reactive edge sites contained in the high-field signal (\u22120.5 to 0 ppm) of the 1H NMR spectrum of \u03b3-Al2O3 materials. This work combines the development of well-defined, needle-shaped \u03b3-Al2O3 nanocrystals having a high relative fraction of edge sites with the use of state-of-the-art solid-state NMR to significantly deepen our understanding of this specific signal. We are able to resolve two hydroxyl sites with distinct isotropic chemical shifts of \u22120.2 and \u22120.4 ppm and different positions within the dipole\u2013dipole network from 1H\u20131H single-quantum double-quantum NMR.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Despite being widely used in numerous catalytic applications, our understanding of reactive surface sites of high-surface-area \u03b3-Al2O3 remains limited to date. Recent contributions have pointed toward the potential role of highly reactive edge sites contained in the high-field signal (\u22120.5 to 0 ppm) of the 1H NMR spectrum of \u03b3-Al2O3 materials. This work combines the [\u2026]<\/p>\n","protected":false},"author":662,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19,1617],"tags":[],"class_list":["post-137935","post","type-post","status-publish","format-standard","hentry","category-chemistry","category-quantum-physics"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/137935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/662"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=137935"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/137935\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=137935"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=137935"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=137935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}