检索结果-南通市图书馆

Rhe.logical and stability analysis of ce.e.t paste. incorporating silica-base. waste.

在线全文

学校读者我要写书评

暂无评论

Particuology 2024年第6期89卷 144-152页

作者： julia da Rosa Martins Janaíde.Cavalcante.Rocha Dachamir Hotza Luciano Se.ff Graduate.Program in Mate.ials Scie.ce.and e.gine.ring(PPGMAT) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate.Program in Civil e.gine.ring(PPGe.) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil Graduate.Program in Che.ical e.gine.ring(POSe.Q) Federal University of Santa Catarina(UFSC)Florianópolis88040-900SCBrazil De.artme.t of Mobility e.gine.ring Federal University of Santa Catarina(UFSC)Joinville89219-600SCBrazil

This study inve.tigate. the.influe.ce.of waste.characte.istics,e.pe.ially ze.a pote.tial,on the.prope.tie. of ce.e.t paste. and *** focus is to e.aluate.the.impact of the.ze.a pote.tial of ce.e.t particle. and waste.mate.ials on the.se.ime.tation spe.d,rhe.logy,and harde.ing time.of stabilize. ce.e.t *** Ce.e.t II F 40,re.arde. additive.silica,and fly ash we.e.use. in the.*** paste. we.e.pre.are.,and during the.stabilization pe.iod,the.r rhe.logical prope.tie. and pH we.e.*** ze.a pote.tial and se.ime.tation spe.d of the.ce.e.t and waste.particle. we.e.me.sure. at the.pH that the.paste. pre.e.te. during the.e.tire.stabilization *** the.stabilization pe.iod,the.paste. we.e.subje.te. to the.harde.ing time.*** ze.a pote.tial analyse. re.e.le. dive.se.value. for the.diffe.e.t powde. type.,with the.ce.e.t particle. e.hibiting a ze.a pote.tial of−3.0 mV,the.silica particle. e.hibiting−10.5 mV,and the.fly ash particle. e.hibiting−20.3 *** influe.ce.of the.high ze.a pote.tial modulus was obse.ve. on the.se.ime.tation spe.d,with the.solution containing fly ash e.hibiting a spe.d of 40.01μm/s,whe.e.s the.solution containing only ce.e.t e.hibite. a spe.d of 99.38μm/*** the.paste.,the.re.ults indicate.that the.pre.e.ce.of fly ash particle. with a significantly ne.ative.ze.a pote.tial le. to a 16%re.uction in harde.ing time.compare. to particle. with a lowe. modulus of ze.a *** te.ts showe. that the.inclusion of fly ash particle. pre.e.te. the.formation of *** the.ze.a pote.tial influe.ce. agglome.ate.formation and harde.ing time.it was found to have.no e.fe.t on yie.d stre.s or viscosity.

关键词： Waste. Ze.a pote.tial Se.ting time Rhe.me.ry

Barosinusitis due.to routine.we.the. change.:A cross-se.tional analysis of public we.site.

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-He.d and Ne.k Surge.y 2024年第1期10卷 18-23页

作者： Jame. C.Campbe.l julia e.Canick Philip G.Che. Ralph Abi Hache. David W.Jang De.artme.t of He.d and Ne.k Surge.y&Communication Scie.ce. Duke University School of MedicineDurhamNorth CarolinaUSA Duke.Unive.sity School of Me.icine DurhamNorth CarolinaUSA De.artme.t of Otolaryngology-He.d and Ne.k Surge.y University of Texas Health Science Center San AntonioSan AntonioTexasUSA

Background:Sinusitis is a common diagnosis that can be.e.rone.usly associate. with routine.we.the.‐re.ate. barome.ric pre.sure.*** actuality,the.e.pre.sure.change. like.y e.ace.bate.migraine.he.dache.,which can cause.facial pain and pre.sure.rathe. than true.sinus ***:The.pre.e.t study sought to characte.ize.the.re.re.e.tation of both sinusitis and migraine.in association with barome.ric pre.sure.change. across we.site. on the.***:An Inte.ne. se.rch for re.e.ant te.ms was conducte.,and conte.t of the.re.ulting page. was asse.se. for associations be.we.n we.the.‐re.ate. pre.sure.change. and e.the. sinusitis or *** in re.orte. re.ults across diffe.e.t subtype. of Inte.ne. source. we.e.*** primary outcome. me.sure. we.e.1)whe.he. a give. me.ia source.associate. barome.ric we.the. change. with sinusitis,(2)whe.he. that source.associate. barome.ric we.the. change. with migraine.and(3)tre.tme.t options offe.e. by that ***:Of the.116 include. we.page.,36(31.03%)associate. sinusitis and routine.barome.ric pre.sure.*** the.e.10(27.77%)we.e.otolaryngology practice.***‐se.e. we.page.(57.76%)associate. migraine.and routine.barome.ric pre.sure.*** the.e.nonotolaryngology we.page. we.e.more.like.y to re.ort this ***:Otolaryngology practice.site. we.e.obse.ve. to be.the.most fre.ue.t profe.sional me.ical re.ource.re.orting the.unsubstantiate. claim that routine.barome.ric pre.sure.change. are.associate. with *** source. we.e.more.like.y to link we.the.‐re.ate. pre.sure.change. to *** re.ults sugge.t that opportunitie. e.ist for otolaryngology practice.site. to e.ucate.patie.ts about nonrhinoge.ic he.dache.e.iologie..

关键词： acute.rhinosinusitis balloon sinus dilation he.dache migraine sinusitis

Otolaryngology re.ide.cy program factors associate. with fe.ale.re.ide.t re.re.e.tation

在线全文

学校读者我要写书评

暂无评论

World Journal of Otorhinolaryngology-He.d and Ne.k Surge.y 2024年第1期10卷 7-11页

作者： julia e.Canick Jame. C.Campbe.l Charle. R.Woodard Lars J.Grimm Alissa M.Collins Duke.Unive.sity School of Me.icine DurhamNorth CarolinaUSA De.artme.t of He.d and Ne.k Surge.y&Communication Scie.ce. Duke University School of MedicineDurhamNorth CarolinaUSA De.artme.t of Radiology Duke University School of MedicineDurhamNorth CarolinaUSA

Obje.tive.Fe.ale.re.re.e.tation in the.fie.d of otolaryngology is *** is the.first point at which me.ical school graduate. spe.ialize.in a chose. fie.d and thus re.re.e.ts an opportunity to re.ruit and train more.fe.ale.*** study sought to ide.tify program factors associate. with gre.te. fe.ale.re.re.e.tation among re.ide.t ***:De.artme.tal we.site. of all 124 otolaryngology re.ide.cy programs in the.Unite. State. and Pue.to Rico we.e.e.amine. for a list of *** programs with a re.ide.t roste. available.the.ge.de.s of re.ide.ts,faculty,program dire.tors,and chairpe.sons we.e.*** and city population for e.ch program was also re.orde.,as was fe.ale.re.ide.t *** we.e.compare. using Pe.rson Chi‐square. univariate.***:1,632 re.ide.ts and 2,605 faculty we.e.include. in the.analysis of 109 *** me.ian fe.ale.re.ide.t re.re.e.tation was 40%.Programs with large. faculty size.,more.fe.ale.faculty,and urban location we.e.associate. with an above.me.ian fe.ale.re.ide.t *** with a large. re.ide.cy cohort approache. significance.re.arding above.me.ian fe.ale.re.ide.t *** fe.ale.faculty re.re.e.tation,program dire.tor ge.de.,chairpe.son ge.de.,and US re.ion we.e.not associate. with variation in fe.ale.re.ide.t ***:Gre.te. fe.ale.otolaryngology re.ide.cy re.re.e.tation was associate. with programs having an urban location and gre.te. numbe.s of fe.ale.and total *** was also like.y that a large. re.ide.t cohort size.may affe.t fe.ale.re.ide.t *** proportions of fe.ale.faculty,program dire.tor,and chairpe.son ge.de.,as we.l as the.US re.ion,we.e.not associate. with variation in fe.ale.re.ide.t ge.de. re.re.e.tation.

关键词： ge.de. program dire.tor re.ruitme.t re.ide.cy training

Traditional Use.of Me.icinal Plants Confirme. by the.Baka in Southe.n and e.ste.n Came.oon

在线全文

学校读者我要写书评

暂无评论

Journal of Bioscie.ce. and Me.icine. 2024年第8期12卷 76-106页

作者： Natacha Nana Afiong Pascal Billong Fils Kare.le.Koue.chua Gue.am e.oge.Kambale.Muhe.i e.a Avila Martin Guille.mo Ros Brull julia e. Fa Ste.han Michae. Funk e.ariste.Fongnzossie.Fe.oung Je.n Lagarde.Be.ti De.artme.t of Biology and Physiology of Plant Organisms University of Douala Douala Cameroon Ze.ca y le.os ONGD Madrid Spain De.artme.t of Natural Scie.ce. School of Science and the Environment Manchester Metropolitan University Manchester UK Ce.te. for Inte.national Fore.try Re.e.rch (CIFOR) CIFOR Headquarters Bogor Indonesia Nature.He.itage Jersey Channel Islands Manchester UK Laboratory of Fore.t Re.ource. and Wood Valorization Training Unit in Engineering Sciences Post Graduate School of Fundamental and Applied Sciences University of Douala Douala Cameroun De.artme.t of Wood Scie.ce. Higher Institute of Agriculture Wood Water resources and Environment University of Ber-toua Bertoua Cameroon

The.limitations of biome.e.ine.to provide.e.fe.tive.solutions to ce.tain pande.ics has le. many pe.ple.to turn to alte.native.the.apie.. The.e.palliative.solutions, particularly phytome.e.ine., are.much sought afte. for dise.se.pre.e.tion and tre.tme.t. The.Baka, a group of fore.t-dwe.ling pe.ple. hold knowle.ge.on how wild plants can be.e.fe.tive.in tre.ting many illne.se.. Howe.e., the.gre.te.t challe.ge.for the.ide.tification of traditional me.icine. de.e.ds on the.ve.acity of the.information provide. during e.hnobotanic surve.s by use. populations. The.pre.e.t study de.cribe. fore.t plants use. by the.Baka and confirme. by the. as be.ng e.ploye. for traditional me.icine. We.carrie. out e.hnobotanical surve.s be.we.n 2019 and 2021 in 221 house.olds within four districts of the.e.ste.n and Southe.n Re.ion of Came.oon. We.use. indice. of significant use.and pe.formance.applie. to all me.tione. spe.ie., alongside.se.rche. in the.lite.ature. The.statistical tools use. to distinguish the.diffe.e.t groups/districts is Pe.rson’s X2 te.t. A total of 378 plant spe.ie. we.e.ide.tifie. of 270 ge.e.a and 85 familie.. e.hnobotanical indice. allowe. to ide.tify the.most confirme. and e.ficie.t plants for se.e.al he.lth proble.s. A pairwise.comparison of the.e.indice. showe. a significant corre.ation with a p-value.e.16 and a dissimilarity distance.le.s than 0.5. Some.plants se.e.te. are.wide.y cite. in othe. re.ions and/or countrie. for the.same.he.lth proble.s. The.pre.e.ce.of active.mole.ule. re.ponsible.for the.r biological activity was also prove., justifying the.r use.in traditional me.icine. This pape. e.amine. the.pote.tial to e.hance.the.value.of Came.oon’s pharmacope.a by inte.rating various e.hnobotanical indice.. It aims to discove. ne. the.ape.tic mole.ule. and de.e.op improve. traditional products from the.dive.se.plant spe.ie. docume.te.. The.findings indicate.opportunitie. to advance.both local and global he.lthcare.solutions.

关键词： Confirme. Plants Import-Substitution Improve. Traditional Me.icine.(ITM) Sustainable.De.e.opme.t Goals The.ape.tic Mole.ule.

e.H2 inhibitors promote.β-like.ce.l re.e.e.ation in young and adult type.1 diabe.e. donors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Signal Transduction and Targe.e. The.apy 2024年第2期9卷 679-692页

作者： Ke.th Al-Hasani Safiya Naina Marikar Harikrishnan Kaipananickal Scott Maxwe.l Jun Okabe.Ishant Khurana Thomas Karagiannis julia J.Liang Lina Mariana Thomas Loudovaris Thomas Kay Assam e.-Osta e.ige.e.ics in Human He.lth and Dise.se.Program Baker Heart and Diabetes Institute75 Commercial RoadMelbourne 3004 VICAustralia De.artme.t of Diabe.e. Central Clinical SchoolMonash UniversityMelbourne 3004 VICAustralia e.ige.e.ics in Human He.lth and Dise.se.Laboratory Central Clinical SchoolMonash UniversityMelbourne 3004 VICAustralia School of Scie.ce STEM CollegeRMIT UniversityMelbourne 3001 VICAustralia Immunology and Diabe.e. Unit St Vincent’s Institute of Medical ResearchFitzroy 3065 VICAustralia De.artme.t of Me.icine.and The.ape.tics The Chinese University of Hong KongSha TinHong Kong SAR Hong Kong Institute.of Diabe.e. and Obe.ity Prince of Wales HospitalThe Chinese University of Hong Kong3/F Lui Che Woo Clinical Sciences Building30-32-Ngan Shing StreetSha TinHong Kong SAR Li Ka Shing Institute.of He.lth Scie.ce. The Chinese University of Hong KongSha TinHong Kong SAR Biome.ical Laboratory Scie.ce Department of TechnologyFaculty of HealthUniversity College CopenhagenCopenhagenDenmark

β-ce.ls are.a type.of e.docrine.ce.l found in pancre.tic isle.s that synthe.ize.store.and re.e.se.*** type.1 diabe.e.(T1D),T-ce.ls of the.immune.syste. se.e.tive.y de.troy the.insulin-producingβ-*** of the.e.ce.ls le.ds to a life.ong de.e.de.ce.on e.oge.ous insulin administration for ***,the.e.is an urge.t ne.d to ide.tify nove. the.apie. that stimulate.-ce.l growth and induce.-ce.l *** and othe.s have.shown that pancre.tic ductal proge.itor ce.ls are.a promising source.for re.e.e.atingβ-ce.ls for T1D owing to the.r inhe.e.t diffe.e.tiation *** transcriptional suppre.sion is re.ractory to e.ocrine.re.ction and tightly controls the.re.e.e.ative.pote.tial by the.e.H2 *** the.pre.e.t study,we.show that transie.t stimulation of e.ocrine.ce.ls,de.ive. from juve.ile.and adult T1D donors to the.FDAapprove. e.H2 inhibitors GSK126 and Taze.e.ostat(Taz)influe.ce.a phe.otypic shift towards aβ-like.ce.l *** transition from re.re.se. to pe.missive.chromatin state. are.de.e.de.t on bivale.t H3K27me. and H3K4me. chromatin *** e.H2 is fundame.tal toβ-ce.l re.e.e.ative.*** pancre.tic ductal ce.ls e.hibit insulin production and se.re.ion in re.ponse.to a physiological glucose.challe.ge.e. *** pre.clinical studie. unde.score.the.pote.tial of small mole.ule.inhibitors as nove. modulators of ductal proge.itor diffe.e.tiation and a promising ne. approach for the.re.toration ofβ-like.ce.l function.

关键词： e.H2 struction inhibitors

Social de.e.minants of gastrointe.tinal malformation mortality in Brazil:a national study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Pe.iatric Surge.y 2024年第2期7卷 134-141页

作者： Ayla Ge.k Amanda Rose.do Luiza Te.le. Aricia Gome. Miranda Made.e.ne.Carroll Bruna Olive.ra Trindade.Sarah Bue.o Motte. e.the. Fre.re.Gabrie.la Hyman julia Fe.re.ra Fabio Bote.ho Rose.nne.Fe.re.ra David P Moone. Joaquim Bustorff-Silva Program in Global Surge.y and Social Change Harvard Medical SchoolBostonMassachusettsUSA Faculty of Me.icine.and He.lth Scie.ce. McGill UniversityMontrealQuebecCanada Harve. e.Be.rdmore.Division of Pe.iatric Surge.y The Montreal Children's HospitalMcGill University Health CentreMontrealQuebecCanada De.artme.t of Surge.y Universidade Estadual de Campinas(UNICAMP)CampinasBrazil Instituto de.e.ucação Médica(IDOMe./e.tácio Campus Vista Carioca)Rio de JaneiroBrazil Faculty of Me.icine Universidade Federal do Delta do ParnaibaParnaibaPiauiBrazil Unive.sidade.Fe.e.al de.Cie.cias da Saude.de.Porto Ale.re Porto AlegreBrazil Unive.sidade.Fe.e.al da Bahia SalvadorBrazil De.artme.t of He.lth Re.e.rch Me.hods McMaster UniversityHamiltonSouthern OntarioCanada De.artme.t of Pe.iatric Surge.y Boston Children's HospitalBostonMassachusettsUSA

Introduction In Brazil,approximate.y 5%are.born with a conge.ital disorde.,pote.tially fatal without *** study aims to e.aluate.the.re.ationship be.we.n gastrointe.tinal conge.ital malformation(GICM)mortality,he.lth indicators,and socioe.onomic factors in *** GICM admissions(Q39-Q45)be.we.n 2012 and 2019 we.e.colle.te. using national *** de.ographics,socioe.onomic factors,clinical manage.e.t,outcome.,and the.he.lthcare.workforce.de.sity we.e.also accounte. *** Surgical Workforce.de.sity and the.numbe. of ne.natal inte.sive.care.units in a re.ion we.e.e.tracte. from national datase.s and combine. to cre.te.a clinical inde. te.me.'Ne.Surg'.Socioe.onomic variable. we.e.combine. to cre.te.a socioe.onomic inde. te.me. Soce.on'.Simple.line.r re.re.sion was use. to inve.tigate.if the.te.poral change. of both inde.e. we.e.*** corre.ation be.we.n mortality and the.diffe.e.t indicators in Brazil was e.aluate. using Pe.rson's corre.ation *** Ove. 8 ye.rs,Brazil re.orde. 12804 GICM *** Southe.st le. with 6147 case.,followe. by the.Northe.st(2660),South(1727),North(1427),and Midwe.t(843).The.North and Northe.st re.orte. the.highe.t mortality,lowe.t Ne.Surg,and Soce.on Inde. ***,mortality rate. de.line. across re.ions from 7.7%(2012)to 3.9%(2019),a 51.7%*** North and Midwe.t e.pe.ie.ce. the.most substantial re.uctions,at 63%and 75%,*** significantly corre.ate. with the.inde.e. in ne.rly all re.ions(pe.corre.ation be.we.n social de.e.minants of he.lth and GICM mortality in Brazil,using two nove. inde.e. in the.pe.iatric *** findings provide.an opportunity to re.hink and discuss ne. indicators that could e.hance.our unde.standing of our country and could le.d to the.de.e.opme.t of ne.e.sary solutions to tackle.e.isting challe.ge. in Brazil and globally.

关键词： Northe.st Brazil globally

Ca^(2+) binding to the.C_(2)e.domain of otofe.lin is re.uire. for hair ce.l e.ocytosis and he.ring

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Prote.n & Ce.l 2024年第4期15卷 305-312页

作者： Han Che. Me.ar Monga Qinghua Fang Loujin Slitin Jakob Ne.f Shashank S.Che.urwar Re.ina Célia Mingroni Ne.to Karina Le.irovitz Alfre.o Tabith,Jr. Fritz Be.se.e. Nils Brose.Kathrin Kusch Carolin Wichmann Nicola Stre.zke.Barbara Vona julia Pre.brasche.ski Tobias Mose. Institute.for Auditory Ne.roscie.ce.and Inne.e.rLab University Medical Center Göttingen37075 GöttingenGermany Collaborative.Re.e.rch Ce.te. 889 University of Göttingen37075 GöttingenGermany Auditory Ne.roscie.ce.and Synaptic Nanophysiology Group Max Planck Institute for Multidisciplinary Sciences37075 GöttingenGermany Göttinge. Graduate.Ce.te. for Ne.roscie.ce. Biophysics and Molecular BiosciencesUniversity of Göttingen37075 GöttingenGermany Bioche.istry of Me.brane.Dynamics Group Institute for Auditory NeuroscienceUniversity Medical Center Göttingen37075 GöttingenGermany Mole.ular Archite.ture.of Synapse. Group Institute for Auditory Neuroscience and InnerEarLabUniversity Medical Center Göttingen37075 GöttingenGermany Ce.te. for Biostructural Imaging of Ne.rode.e.e.ation University Medical Center Göttingen37075 GöttingenGermany Auditory Syste.s Physiology Group Institute for Auditory Neuroscience and InnerEarLabUniversity Medical Center Göttingen37075 GöttingenGermany De.artame.to de.Ge.ética e.Biologia e.olutiva Centro de Pesquisas sobre o Genoma Humano e Células-TroncoInstituto de BiociênciasUniversidade de São PauloSão Paulo 05508-220Brazil Laboratório de.Otorrinolaringologia/LIM32 Faculdade de MedicinaHospital das ClínicasUniversidade de São PauloSão PauloSP 05508-220Brazil De.DIC Pontifícia Universidade Católica de São PauloSão Paulo 05508-220Brazil De.artme.t of Mole.ular Ne.robiology Max Planck Institute for Multidisciplinary Sciences37075 GöttingenGermany Multiscale.Bioimaging Cluste. of e.ce.le.ce.MBe.C) University of Göttingen37075 GöttingenGermany Functional Auditory Ge.omics Group Auditory Neuroscience and Optogenetics LaboratoryGerman Primate Center37077 GöttingenGermany He.ring Ge.omics Group Institute for Auditory Neuroscience and InnerEarLabUniversity Medical Center Göttingen37075 GöttingenGermany Institute.of Human Ge.e.ics University Medical Center Göttingen37075 GöttingenGermany

De.r e.itor,Affe.e.t synapse. of cochle.r inne. hair ce.ls(IHCs)e.ploy a unique.mole.ular machine.y(se. e.te.de. background in Supple.e.tary Mate.ials).Otofe.lin is a ke. playe. in this machine.y and its de.e.ts cause.human auditory synaptopathy(Mose. and Starr,2016).Otofe.lin,a tail-anchore.(Vogl e. al.,2016)multi-C_(2)-domain prote.n(Fig.1Ai)spe.ific to hair ce.ls(Roux e. al.,2006),is a me.be. of the.fe.lin prote.n family involve. in me.brane.trafficking and re.air that are.of major dise.se.re.e.ance.Pangršiče. al.,2012),also se. Supple.e.tary *** is distribute. broadly within IHCs(Fig.2Ai-Aiii;Pangrsic e. al.,2010;Roux e. al.,2006).

关键词： auditory hair

Organochlorine.pe.ticide.and he.vy me.al re.idue. in some.e.ible.biota colle.te. from Quanzhou Bay and Xinghua Bay,Southe.st China

在线全文

学校读者我要写书评

暂无评论

Journal of e.vironme.tal Scie.ce. 2010年第2期22卷 314-320页

作者： Mangala Yatawara Odhiambo Joshua Owago julia e.Burne. Ke. Laboratory of Bioge.logy and e.vironme.tal Ge.logy of Ministry of e.ucation

In orde. to asse.s the.contamination of e.ible.marine.organisms in Quanzhou and Xinghua Bays, Fujian Province. China, conce.trations of organochlorine.pe.ticide. （he.achlorocyclohe.ane.isome.s or HCHs and dichlorodiphe.yltrichloroe.hane.isome.s/de.ivative. or DDTs） and he.vy me.als （Cu, Pb, Zn, As, Cr, Cd, Ni and Hg） in 13 spe.ie. colle.te. from diffe.e.t site. in the.hays we.e.analyze. by GC-e.D and ICP-MS. The.conce.tration of the.sum of DDTs e.ce.de. that the.sum of HCHs in the.sample.. Most of the.organisms showe. highe. le.e.s of DDTs than the.first le.e. crite.ion （10 ng/g） for marine.biological quality in China （GB 18421-2001） but conforme. to the.first le.e. crite.ion （20 ng/g） for HCHs. The.e.timate. me.n daily uptake.of pe.ticide. was be.ow the.le.e. for minimal risk to the.consume.s. The.le.e.s of Cd, As and Pb in most organisms from both bays we.e.marke.ly e.e.ate. and above.the.re.omme.de. le.al limits for human consumption. Our re.ults showe. the.ne.d for routine.monitoring of marine.spe.ie. contamination to e.sure.public and e.vironme.tal he.lth.

关键词： organochlorine.pe.ticide. re.idue.le.e.s te.hnical HCH he.vy me.als Fujian Province

Controlle. building of CdSe.ZnS/Au and CdSe.ZnS/ Au2S/Au nanohybrids

在线全文

学校读者我要写书评

暂无评论

Nano Re.e.rch 2015年第7期8卷 2271-2287页

作者： Raque. e. Galian Pilar Diaz Antonio Ribe.a Ale.andro Rincon-Be.tolin Said Agouram julia Pe.e.-Prie.o Instituto de.Cie.cia Mole.ular (ICMol) Universidad de Valencia c/ Catedrdtico Jose Beltran 2 46980 Paterna Valencia Spain De.artme.t of Applie. Physics and e.e.tromagne.ism Dr. Moliner 50 Universidad de Valencia 461 00 Burjassot Valencia Spain

The.addition of Au3. to sphe.ical amine.cappe. CdSe.ZnS nanoparticle. in tolue.e.at room te.pe.ature.and unde. darkne.s can le.d to te.nary CdSe.ZnS/Au nanohybrids. We.de.onstrate.that this happe.s only whe. the.nanoparticle. posse.s a re.ative.y thin ZnS she.l, thus showing that thickne.s plays a ke. role.in gold de.osition on the.CdSe.ZnS nanoparticle.surface. Our hypothe.is is that the.amine.ligand acts as the.re.uctant of Au3＋ ions into Au＋ ions, whose.affinity for sulfur would ke.p the. at the.CdSe.ZnS surface. This inte.action stabilize. the.Au＋ ion, making it le.s prone.to re.uction than a non-coordinate. Au＋ ion. In CdSe.ZnS with a thin she.l, Au＋ ions at the.surface.of, or most probably within, the.ZnS she.l cause.the.transfe. of Cd2＋ ions into the.solution. Subse.ue.tly, the.core.Se.- anion, which is a be.te. re.uctant than the.she.l S2- re.uce. Au＋ ions to Au（0）, and large.gold nanoparticle. （AuNPs） are.quickly de.osite. on the.CdSe.ZnS surface.in room te.pe.ature.proce.s, le.ding to te.nary CdSe.ZnS/Au nanohybrids. In solution, the.e.te.nary nanohybrids progre.sive.y transform into quate.nary CdSe.ZnS/Au2S/Au nanohybrids due.to the.re.ction of the.she.l S2- anion with the.re.aining Au＋ at the.CdSe.ZnS surface. thus le.ding to the.growth of Au2S nanoparticle. on the.CdSe.ZnS surface.while.Zn concomitantly le.che. from the.nanohybrid into the.solution. Photoirradiation of the.he.e.ostructure. with visible.light e.hance. the.r e.ission e.ficie.cy. Comparative.y, irradiation of the.pre.ursors, i.e., CdSe.ZnS nanoparticle., cause. a drastic de.re.se.in the.r e.ission accompanie. by a blue.shift of the.r e.ission maximum. The.optical prope.tie. of the.e.nanohybrids we.e.analyze. by absorption and fluore.ce.ce.（ste.dy-state.and time.re.olve.） spe.troscopy, and the.composition of the.sample. and the.che.ical state. we.e.de.e.mine. by e.e.gy dispe.sive.X-ray spe.troscopy （e.X） and X-ray photoe.e.tron spe.troscopy （XPS）, re.pe.tive.y. Finally, the.structural and m

关键词： he.e.ostructure. se.iconductor nanoparticle me.allic fluore.ce.ce time.re.olve. studie.