{"id":6095,"date":"2026-10-19T09:48:28","date_gmt":"2026-10-19T09:48:28","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-efnafraedi-ragesh-kumar-t-puthiyaveettil\/"},"modified":"2026-10-19T09:48:28","modified_gmt":"2026-10-19T09:48:28","slug":"doktorsvorn-i-efnafraedi-ragesh-kumar-t-puthiyaveettil","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-efnafraedi-ragesh-kumar-t-puthiyaveettil\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed efnafr\u00e6\u00f0i – Ragesh Kumar T. Puthiyaveettil"},"content":{"rendered":"
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Doktorsefni:<\/strong> Ragesh Kumar T. Puthiyaveettil<\/p>\n

Heiti ritger\u00f0ar:<\/strong> Hlutverk l\u00e1gorkurafeinda \u00ed ni\u00f0urbroti k\u00edsil innihaldandi efna til notkunar \u00ed \u00f6rprentun yfirbor\u00f0a me\u00f0 sk\u00f6rpum rafeindasgeislum: HFeCo3(CO)12, H2FeRu3(CO)13, SiC5H10Cl2, SiC5H12 and Si3C3H12<\/p>\n

Andm\u00e6lendur:<\/strong><\/p>\n

Dr. Lionel Amiaud vi\u00f0 Sameindaraunv\u00edsindastofnun Orsay (ISMO) H\u00e1sk\u00f3lans \u00ed su\u00f0ur-Par\u00eds, Frakklandi<\/p>\n

Dr. Janina Kopyra hj\u00e1 Geisla- og kjarnefnafr\u00e6\u00f0ideild Siedlce H\u00e1sk\u00f3la n\u00e1tt\u00faru- og mannv\u00edsinda \u00ed P\u00f3llandi.<\/p>\n

Lei\u00f0beinandi:<\/strong> Oddur Ing\u00f3lfsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

A\u00f0rir \u00ed doktorsnefnd: <\/strong>D. Howard Fairbrother, pr\u00f3fessor vi\u00f0 Efnafr\u00e6\u00f0ideild Johns Hopkins H\u00e1sk\u00f3lans \u00ed Baltimore, Bandar\u00edkjunum og Dr. C. W. Hagen Pr\u00f3fessor vi\u00f0 E\u00f0lisfr\u00e6\u00f0ideild hj\u00e1 Stofnun hagn\u00fdttra v\u00edsinda T U Delft, 2628CJ Delft \u00ed Hollandi\u00fe<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong> Ragnar Sigur\u00f0sson, varadeildarforseti Raunv\u00edsindadeildar.<\/p>\n

\u00c1grip af ranns\u00f3kn: <\/strong>\u00d6rprentun me\u00f0 sk\u00f6rpum rafeindageisla (e. Focused Electron Beam Induced Deposition, FEBID) er a\u00f0fer\u00f0 sem nota m\u00e1 til a\u00f0 prenta \u00fer\u00edv\u00ed\u00f0a str\u00fakt\u00fara \u00e1 yfirbor\u00f0 me\u00f0 rafeindahv\u00f6tu\u00f0u ni\u00f0urbroti svokalla\u00f0ra forverasameinda. \u00dea\u00f0 eru \u00fe\u00f3 enn \u00fe\u00f3nokkrar hindranir sem standa \u00ed vegi fyrir notkun FEBID, \u00fear \u00e1 me\u00f0al \u00f3hreinindi \u00ed \u00fatfellingum og og breikkun \u00feeirra. \u00deessar hindranir m\u00e1 a\u00f0 st\u00f3ru leyti rekja til dreifingar l\u00e1gorkurafeinda (rafeinda me\u00f0 hreyfiorku undir 50 eV) \u00fat fyrir brennipunkt rafeindageislans og \u00f3fullkomi\u00f0 ni\u00f0urbrot \u00e1 forverasameindunum. Nokkrar rafeindadrifnar ni\u00f0urbrotslei\u00f0ir eru m\u00f6gulegar \u00e1 l\u00e1gorkusvi\u00f0inu: rj\u00fafandi rafeindar\u00e1lagning (Dissociative Electron Attchment, DEA), rj\u00fafandi j\u00f3nun (e. Dissociative Ionization, DI), tv\u00edskautssundrun (Dipolar Dissociation, DD) og hlutlaus sundrun (e. Neutral Dissociation, ND). Vi\u00f0 hagn\u00fdtingu \u00e1 FEBID getur vitneskja um hv\u00f6rf drifin af l\u00e1gorkurafeindum skipt sk\u00f6pum. Ein m\u00f6guleg n\u00e1lgun vi\u00f0 ranns\u00f3knir \u00e1 \u00feessum ferlum er samtvinna\u00f0ar m\u00e6lingar \u00e1 forverasamendum \u00ed gasfasa og \u00e1 yfirbor\u00f0um.<\/p>\n

Tilraunir \u00ed gasfasa eru svokalla\u00f0ar \u00fevergeislatilraunir \u00fear sem rafeindageisli (hreyfiorka rafeindanna er 0-80 eV) og sameindageisli m\u00e6tast undir r\u00e9ttu horni. \u00deessar m\u00e6lingar eru ger\u00f0ar vi\u00f0 l\u00e1gan \u00fer\u00fdsting, sem tryggir a\u00f0 hver sameind v\u00edxlverkar einungis vi\u00f0 eina rafeind. J\u00f3nir sem myndast vi\u00f0 \u00feessa v\u00edxlverkan eru greindar me\u00f0 massagreini. \u00cd yfirbor\u00f0sm\u00e6lingum a\u00f0sogast forverasameindir \u00e1 kalt yfirbor\u00f0 (vi\u00f0 153K) vi\u00f0 mj\u00f6g l\u00e1gan \u00fer\u00fdsting og eru s\u00ed\u00f0an geisla\u00f0ar me\u00f0 brei\u00f0um rafeindageisla (~500 eV). \u00de\u00e6r breytingar sem eiga s\u00e9r sta\u00f0 \u00e1 efnunum \u00e1 yfirbor\u00f0inu eru reyndar me\u00f0 R\u00f6ntgen lj\u00f3sr\u00f6funarm\u00e6li (X-ray Photoelectron Spectrometer, XPS) og \u00feau efni sem losna fr\u00e1 yfirbor\u00f0inu eru m\u00e6ld me\u00f0 massagreini.<\/p>\n

\u00cd \u00feessari ritger\u00f0 er sj\u00f3num beint a\u00f0 gasfasa- og yfirbor\u00f0sm\u00e6lingum \u00e1 forverasameindunum HFeCo3(CO)12 and H2FeRu3(CO)13. \u00de\u00f3 b\u00e1\u00f0ar sameindirnar s\u00e9u tv\u00edm\u00e1lmar, me\u00f0 svipa\u00f0a uppbyggingu og l\u00f6gun, hefur reynslan af \u00feeim \u00ed FEBID veri\u00f0 gj\u00f6r\u00f3l\u00edk. \u00dev\u00ed er samanbur\u00f0ur milli \u00feeirra \u00ed gasfasa- og yfirbor\u00f0sm\u00e6lingum \u00e1hugaver\u00f0ur. Gasfasatilraunirnar sem h\u00e9r eru kynntar eru a\u00f0allega DEA og DI \u00e1 HFeCo3(CO)12 and H2FeRu3(CO)13. A\u00f0 auki voru skammtafr\u00e6\u00f0ilegir \u00fatreikningar \u00e1 sameindunum framkv\u00e6mdir til a\u00f0 meta l\u00edklegustu ni\u00f0urbrotslei\u00f0ir. Yfirbor\u00f0sm\u00e6lingarnar voru s\u00ed\u00f0an nota\u00f0ar til a\u00f0 athuga hva\u00f0a \u00e1hrif yfirbor\u00f0i\u00f0 hefur tengjarof \u00e1 sameindunum. Ni\u00f0urst\u00f6\u00f0ur m\u00e6linganna s\u00fdna hvers vegna \u00feessar tv\u00e6r sameindir eru svo \u00f3l\u00edkar \u00ed FEBID.<\/p>\n

A\u00f0 auki eru FEBID m\u00e6lingar \u00e1 trisilacyclohexane (TSCH), dichlorosilacyclohexane (DCSCH) og silacyclohexane (SCH) og ni\u00f0urbrot \u00feeirra \u00ed DEA og DI bori\u00f0 saman. Forverasameindirnar SCH og TSCH s\u00fdna ekkert ni\u00f0urbrot \u00ed DEA en DCSCH s\u00fdnir talsvert ni\u00f0urbrot. Allar sameindirnar brotna ni\u00f0ur vi\u00f0 DI. Athyglinni er beint a\u00f0 spurningum eins og \u201chefur \u00f3hvarfgirni TSCH m.t.t. DEA samanbori\u00f0 vi\u00f0 DCSH \u00e1hrif \u00e1 FEBID?\u201d og \u201cHefur auki\u00f0 k\u00edsilsinnihaldi \u00ed TSCH einhver \u00e1hrif \u00ed FEBID?\u201d..<\/p>\n

Um doktorsefni\u00f0: <\/strong>Ragesh f\u00e6ddist 16. \u00e1g\u00fast 1988 \u00ed Kerala, Indlandi. Hann lauk meistaragr\u00e1\u00f0u \u00ed Lj\u00f3seindafr\u00e6\u00f0i \u00e1ri\u00f0 2010 fr\u00e1 National Institute of Technology, Kalk\u00fatta, Indlandi. Eftir meistaragr\u00e1\u00f0una, vann hann sem Lj\u00f3seindafr\u00e6\u00f0ingur \u00ed 1 \u00e1r. \u00c1ri\u00f0 2014 h\u00f3f Ragesh doktorsn\u00e1m \u00ed H\u00e1sk\u00f3la \u00cdslands undir handlei\u00f0slu Pr\u00f3f. Odds Ing\u00f3lfssonar. Megin \u00e1hersla \u00ed doktorsverkefni er, framk\u00f6llun ni\u00f0urbrots \u00e1 tv\u00edm\u00e1lma og k\u00edsil innihaldandi efnum (FEBID) me\u00f0 l\u00e1gorkurafeindum.<\/p>\n

Facebook vi\u00f0bur\u00f0ur<\/a><\/p>\n<\/div><\/div>","protected":false},"featured_media":1857,"template":"","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"_phd_date_start":"2017-12-15T11:30:00+00:00","_phd_date_end":"2017-12-15T14:30:00+00:00","_phd_location":"Askja N-132","_phd_admission":"A\u00f0gangur \u00f3keypis","_phd_thesis_title":"Hlutverk l\u00e1gorkurafeinda \u00ed ni\u00f0urbroti k\u00edsil innihaldandi efna til notkunar \u00ed \u00f6rprentun yfirbor\u00f0a me\u00f0 sk\u00f6rpum rafeindasgeislum: HFeCo3(CO)12, H2FeRu3(CO)13, SiC5H10Cl2, SiC5H12 and Si3C3H12","_phd_source_url":"https:\/\/gamli.hi.is\/vidburdir\/doktorsvorn_i_efnafraedi_ragesh_kumar_t_puthiyaveettil","_phd_source_node_id":"309262","_phd_source_type":"vidburdir","_phd_member_id":489,"footnotes":""},"phd_school":[101,93],"phd_discipline":[102],"class_list":["post-6095","phd_defence","type-phd_defence","status-publish","has-post-thumbnail","hentry","phd_school-raunvisindadeild","phd_school-verkfraedi-og-natturuvisindasvid","phd_discipline-phd-i-efnafraedi"],"_links":{"self":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6095","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence"}],"about":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/types\/phd_defence"}],"version-history":[{"count":0,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_defence\/6095\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media\/1857"}],"wp:attachment":[{"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/media?parent=6095"}],"wp:term":[{"taxonomy":"phd_school","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_school?post=6095"},{"taxonomy":"phd_discipline","embeddable":true,"href":"https:\/\/phd.hi.is\/en\/wp-json\/wp\/v2\/phd_discipline?post=6095"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}