{"id":270,"date":"2015-05-29T15:35:36","date_gmt":"2015-05-29T14:35:36","guid":{"rendered":"http:\/\/wp.cs.ucl.ac.uk\/gift-surg-intranet\/?p=270"},"modified":"2015-05-29T15:35:36","modified_gmt":"2015-05-29T14:35:36","slug":"sacha-noimark-april-2015-optimisation-mwcnt-pdms-coatings-optical-fibres","status":"publish","type":"post","link":"https:\/\/wp1.cs.ucl.ac.uk\/gift-surg-intranet\/2015\/05\/29\/sacha-noimark-april-2015-optimisation-mwcnt-pdms-coatings-optical-fibres\/","title":{"rendered":"Sacha Noimark, April 2015: Optimisation of MWCNT-PDMS coatings on optical fibres"},"content":{"rendered":"<ul>\n<li>Laser-generated ultrasound study #3: 200 micron fibres: MWCNT + PDMS, 1, 2, \u20267 dips MWCNTs all with PDMS overcoat. Compare to previous integrated fibre. Study indicates that subsequent dips into MWCNT\/xylene solution do not significantly enhance ultrasound generation. Further coatings developed using 1 x MWCNT dip and PDMS overcoat.<\/li>\n<li>MWCNT films onto thin cover slips for further measurements \u2013 both integrated coatings and bilayer coatings. Achieved using dip coating deposition technique.<\/li>\n<li>Note that the MWCNT coating on fibres have coffee ring effect \u2013 thicker MWCNT coating around the fibre circumference and patchier coating in the fibre centre. Research into inkjet printing techniques to overcome coffee ring effects. Use of dual solvent combination &#8211; explore range. For aqueously dispersed nanotubes, the use of a water\/MeOH combination eradicates coffee ring effect (1:1). For xylene dispersed nanotubes, xylene\/acetone combination (2:1). Interestingly, fMWCNT\/ xylene + acetone combination results in the formation of a gel like material. Fibres dipped in this gel show no coffee ring effect with a very dense nanotube mesh at the fibre tip.<\/li>\n<li>\u2018Scratch test\u2019 \u2013 Fibres coated with MWCNTs and PDMS overcoat tested against sellotape and a surgical scalpel to determine coating robustness. Coatings remain adhered to fibre upon repeated exposure to Sellotape. Forceful use of scalpel effects some coating damage but does not completely destroy it.<\/li>\n<li>Characterisation: Raman, UV Vis (absorption and transmission measurements), Optical microscopy (stereo microscope), Scanning electron microscopy, AFM, ATR-IR spectroscopy.<\/li>\n<li>Preliminary incorporation of AuNPs, Au nanorods, dyes and QDs into PDMS but concentrations too low. Optimisation area for future work<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p>Sacha Noimark<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Laser-generated ultrasound study #3: 200 micron fibres: MWCNT + PDMS, 1, 2, \u20267 dips MWCNTs all with PDMS overcoat. Compare to previous integrated fibre. Study indicates that subsequent dips into MWCNT\/xylene solution do not significantly enhance ultrasound generation. Further coatings<\/p>\n","protected":false},"author":31,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"class_list":["post-270","post","type-post","status-publish","format-standard","hentry","category-electronic-journal"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Sacha Noimark, April 2015: Optimisation of MWCNT-PDMS coatings on optical fibres - GIFT-Surg Intranet<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/wp1.cs.ucl.ac.uk\/gift-surg-intranet\/2015\/05\/29\/sacha-noimark-april-2015-optimisation-mwcnt-pdms-coatings-optical-fibres\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sacha Noimark, April 2015: Optimisation of MWCNT-PDMS coatings on optical fibres - GIFT-Surg Intranet\" \/>\n<meta property=\"og:description\" content=\"Laser-generated ultrasound study #3: 200 micron fibres: MWCNT + PDMS, 1, 2, \u20267 dips MWCNTs all with PDMS overcoat. Compare to previous integrated fibre. Study indicates that subsequent dips into MWCNT\/xylene solution do not significantly enhance ultrasound generation. 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