Name: monitoring the effects of illumination on the structure of conjugated polymer gels using neutron scattering
Uploaded: 2017-12-21T12:30:00
Description: Watch this Scientific Journal Video about Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering at JoVE.com

Forfatterne parlamentsarbejdet National Science Foundation (DMR-1409034) til støtte for dette projekt. Vi erkender også med støtte fra National Institute for standarder og teknologi, US Department of Commerce, i forbindelse med de USANS anlæg, som anvendes i dette arbejde, hvor disse faciliteter er delvist understøttet af National Science Foundation under aftalen Lol DMR-0944772. SANS eksperimenter af denne forskning blev afsluttet på ORNLS høje Flux isotop reaktor, der var sponsoreret af videnskabelige bruger faciliteter Division, Office of grundlæggende energi Sciences, os Department of Energy.

Al håndtering af kemikalier skal foretages med passende personlige værnemidler og inden for en sikkerhed hætte. Alle prøver udsat for ioniserende stråling, skal håndteres under tilsyn af faciliteter radioaktive styring teknikere. Denne protokol blev udført af personer, der havde afsluttet passende stråling sikkerhedsuddannelse.
1. forberedelse af P3HT i d-ODCB løsninger
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	<li>Prøven erhvervelse
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		<li>Køb 1 g af høj regioregularity (&#62; 90%) P3HT i mol...

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	<li>G&#252;nes, S., Neugebauer, H., Sariciftci, N. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conjugated+Polymer-Based+Organic+Solar+Cells.">Conjugated Polymer-Based Organic Solar Cells.</a> Chem. Rev. 107 (4), 1324-1338 (2007).</li><li>Burroughes, J. H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Light-Emitting+Diodes+Based+on+Conjugated+Polymers.">Light-Emitting Diodes Based on Conjugated Polymers.</a> Letters to Nature. 347, 539-541 (1990).</li><li>Coakley, K. M., McGehee, M. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conjugated+Polymer+Photovoltaic+Cells.">Conjugated Polymer Photovoltaic Cells.</a> Chem. Mater. 16 (23), 4533-4542 (2004).</li><li>Tyler McQuade, D., Pullen, A. E., Swager, T. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conjugated+Polymer-Based+Chemical+Sensors.">Conjugated Polymer-Based Chemical Sensors.</a> Chem. Rev. 100 (7), 2537-2574 (2000).</li><li>Wang, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Self-Stratified+Semiconductor/dielectric+Polymer+Blends:+Vertical+Phase+Separation+for+Facile+Fabrication+of+Organic+Transistors.">Self-Stratified Semiconductor/dielectric Polymer Blends: Vertical Phase Separation for Facile Fabrication of Organic Transistors.</a> J. Mater. Chem. C. 1 (25), 3989 (2013).</li><li>Segalman, R., McCulloch, B., Kirmayer, S., Urban, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Block+Copolymers+for+Organic+Optoelectronics.">Block Copolymers for Organic Optoelectronics.</a> Macromolecules. 42 (23), 9205-9216 (2009).</li><li>Chen, H., Hsiao, Y., Hu, B., Dadmun, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Control+of+Morphology+and+Function+of+Low+Band+Gap+Polymer-bis-Fullerene+Mixed+Heterojunctions+in+Organic+Photovoltaics+with+Selective+Solvent+Vapor+Annealing.">Control of Morphology and Function of Low Band Gap Polymer-bis-Fullerene Mixed Heterojunctions in Organic Photovoltaics with Selective Solvent Vapor Annealing.</a> J. Mater. Chem. A. 2, 9883 (2014).</li><li>Li, Y., Vamvounis, G., Holdcroft, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Tuning+Optical+Properties+and+Enhancing+Solid-State+Emission+of+Poly+(Thiophene)+S+by+Molecular+Control:+A+Postfunctionalization+Approach.">Tuning Optical Properties and Enhancing Solid-State Emission of Poly (Thiophene) S by Molecular Control: A Postfunctionalization Approach.</a> Macromolecules. 35, 6900-6906 (2002).</li><li>Nguyen, T. -. Q., Martini, I. B., Liu, J., Schwartz, B. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Controlling+Interchain+Interactions+in+Conjugated+Polymers:+The+Effects+of+Chain+Morphology+on+Exciton&#8722;,Exciton+Annihilation+and+Aggregation+in+MEH&#8722;,PPV+Films.">Controlling Interchain Interactions in Conjugated Polymers: The Effects of Chain Morphology on Exciton&#8722;,Exciton Annihilation and Aggregation in MEH&#8722;,PPV Films.</a> J. Phys. Chem. B. 104 (2), 237-255 (2000).</li><li>Chen, H., Hu, S., Zang, H., Hu, B., Dadmun, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Precise+Structural+Development+and+Its+Correlation+to+Function+in+Conjugated+Polymer:+Fullerene+Thin+Films+by+Controlled+Solvent+Annealing.">Precise Structural Development and Its Correlation to Function in Conjugated Polymer: Fullerene Thin Films by Controlled Solvent Annealing.</a> Adv. Funct. Mater. 23, 1701-1710 (2013).</li><li>Schwartz, B. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conjugated+Polymers+as+Molecular+Materials:+How+Chain+Conformation+and+Film+Morphology+Influence+Energy+Transfer+and+Interchain+Interactions.">Conjugated Polymers as Molecular Materials: How Chain Conformation and Film Morphology Influence Energy Transfer and Interchain Interactions.</a> Annu. Rev. Phys. Chem. 54 (3), 141-172 (2003).</li><li>Haugeneder, A., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Exciton+Diffusion+and+Dissociation+in+Conjugated+Polymer/fullerene+Blends+and+Heterostructures.">Exciton Diffusion and Dissociation in Conjugated Polymer/fullerene Blends and Heterostructures.</a> Phys. Rev. B. 59 (23), 15346-15351 (1999).</li><li>Sirringhaus, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Two-Dimensional+Charge+Transport+in+Self-Organized,+High-Mobility+Conjugated+Polymers.">Two-Dimensional Charge Transport in Self-Organized, High-Mobility Conjugated Polymers.</a> Nature. 401 (6754), 685-688 (1999).</li><li>Al-Ibrahim, M., Ambacher, O., Sensfuss, S., Gobsch, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+Solvent+and+Annealing+on+the+Improved+Performance+of+Solar+Cells+Based+on+poly(3-Hexylthiophene):+Fullerene.">Effects of Solvent and Annealing on the Improved Performance of Solar Cells Based on poly(3-Hexylthiophene): Fullerene.</a> Appl. Phys. Lett. 86, 201120 (2005).</li><li>Koppe, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Influence+of+Molecular+Weight+Distribution+on+the+Gelation+of+P3HT+and+Its+Impact+on+the+Photovoltaic+Performance.">Influence of Molecular Weight Distribution on the Gelation of P3HT and Its Impact on the Photovoltaic Performance.</a> Macromolecules. 42, 4661-4666 (2009).</li><li>Malik, S., Jana, T., Nandi, A. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Thermoreversible+Gelation+of+Regioregular+poly(3-Hexylthiophene)+in+Xylene.">Thermoreversible Gelation of Regioregular poly(3-Hexylthiophene) in Xylene.</a> Macromolecules. 34 (2), 275-282 (2001).</li><li>Xu, W., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Sol–gel+Transition+of+poly(3-Hexylthiophene)+Revealed+by+Capillary+Measurements:+Phase+Behaviors,+Gelation+Kinetics+and+the+Formation+Mechanism.">Sol–gel Transition of poly(3-Hexylthiophene) Revealed by Capillary Measurements: Phase Behaviors, Gelation Kinetics and the Formation Mechanism.</a> Soft Matter. 8, 726 (2012).</li><li>Chan, K. H. K., Yamao, T., Kotaki, M., Hotta, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Unique+Structural+Features+and+Electrical+Properties+of+Electrospun+Conjugated+Polymer+poly(3-Hexylthiophene)+(P3HT)+Fibers.">Unique Structural Features and Electrical Properties of Electrospun Conjugated Polymer poly(3-Hexylthiophene) (P3HT) Fibers.</a> Synth. Met. 160 (23-24), 2587-2595 (2010).</li><li>Wicklein, A., Ghosh, S., Sommer, M., W&#252;rthner, F., Thelakkat, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Self-Assembly+of+Semiconductor+Organogelator+Nanowires+for+Photoinduced+Charge+Separation.">Self-Assembly of Semiconductor Organogelator Nanowires for Photoinduced Charge Separation.</a> ACS Nano. 3 (5), 1107-1114 (2009).</li><li>Newbloom, G. M., Weigandt, K. M., Pozzo, D. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Electrical,+Mechanical,+and+Structural+Characterization+of+Self-Assembly+in+poly(3-Hexylthiophene)+Organogel+Networks.">Electrical, Mechanical, and Structural Characterization of Self-Assembly in poly(3-Hexylthiophene) Organogel Networks.</a> Macromolecules. 45, 3452-3462 (2012).</li><li>Li, L., Tang, H., Wu, H., Lu, G., Yang, X. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+Fullerene+Solubility+on+the+Crystallization+of+poly(3-Hexylthiophene)+and+Performance+of+Photovoltaic+Devices.">Effects of Fullerene Solubility on the Crystallization of poly(3-Hexylthiophene) and Performance of Photovoltaic Devices.</a> Org. Electron. physics, Mater. Appl. 10 (7), 1334-1344 (2009).</li><li>Bu, L., Pentzer, E., Bokel, F. A., Emrick, T., Hayward, R. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Growth+of+Polythiophene+/+Perylene+Tetracarboxydiimide+Donor+/+Acceptor+Shish-Kebab+Nanostructures+by+Coupled+Crystal+Modi+Fi+Cation.">Growth of Polythiophene / Perylene Tetracarboxydiimide Donor / Acceptor Shish-Kebab Nanostructures by Coupled Crystal Modi Fi Cation.</a> ACS Nano. 6 (12), 10924-10929 (2012).</li><li>Yang, X., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Nanoscale+Morphology+of+High-Performance+Polymer+Solar+Cells.">Nanoscale Morphology of High-Performance Polymer Solar Cells.</a> Nano Lett. 5 (4), 579-583 (2005).</li><li>Newbloom, G. M., Kim, F. S., Jenekhe, S. a., Pozzo, D. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mesoscale+Morphology+and+Charge+Transport+in+Colloidal+Networks+of+Poly(3-Hexylthiophene).">Mesoscale Morphology and Charge Transport in Colloidal Networks of Poly(3-Hexylthiophene).</a> Macromolecules. 44, 3801-3809 (2011).</li><li>Tretiak, S., Saxena, A., Martin, R., Bishop, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Conformational+Dynamics+of+Photoexcited+Conjugated+Molecules.">Conformational Dynamics of Photoexcited Conjugated Molecules.</a> Phys. Rev. Lett. 89 (9), 97402 (2002).</li><li>Botiz, I., Freyberg, P., Stingelin, N., Yang, A. C. -. M., Reiter, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reversibly+Slowing+Dewetting+of+Conjugated+Polymers+by+Light.">Reversibly Slowing Dewetting of Conjugated Polymers by Light.</a> Macromolecules. 46, 2352-2356 (2013).</li><li>Botiz, I., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enhancing+the+Photoluminescence+Emission+of+Conjugated+MEH-PPV+by+Light+Processing.">Enhancing the Photoluminescence Emission of Conjugated MEH-PPV by Light Processing.</a> ACS Appl. Mater. Interfaces. 6 (7), 4974-4979 (2014).</li><li>Morgan, B., Dadmun, M. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Illumination+Alters+the+Structure+of+Gels+Formed+from+the+Optoelectronic+Material+P3HT.">Illumination Alters the Structure of Gels Formed from the Optoelectronic Material P3HT.</a> Polymer. 108, 313-321 (2017).</li><li>Morgan, B., Dadmun, M. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Illumination+of+Conjugated+Polymer+in+Solution+Alters+Its+Conformation+and+Thermodynamics.">Illumination of Conjugated Polymer in Solution Alters Its Conformation and Thermodynamics.</a> Macromolecules. 49 (9), 3490-3496 (2016).</li><li>Ilavsk, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Phase+Transition+in+Swollen+Gels.+2.+Effect+of+Charge+Concentration+on+the+Collapse+and+Mechanical+Behavior+of+Polyacrylamide+Networks.">Phase Transition in Swollen Gels. 2. Effect of Charge Concentration on the Collapse and Mechanical Behavior of Polyacrylamide Networks.</a> Macromolecules. 15, 782-788 (1982).</li><li>Tanaka, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Collapse+of+Gels+and+the+Critical+Endpoint.">Collapse of Gels and the Critical Endpoint.</a> Phys. Rev. Lett. 40 (12), 820-823 (1978).</li><li>. SANS &amp; USANS Data Reduction and Analysis Available from: <a target="_blank" href="https://www.ncnr.nist.gov/programs/sans/data/red_anal.html">https://www.ncnr.nist.gov/programs/sans/data/red_anal.html</a> (2017)</li><li>Feigin, L., Svergun, D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Structure Analysis by Small-Angle X-Ray and Neutron Scattering. , (1987).</li><li>Mittelbach, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Zur+Rontgenkleinwinkelstreuung+verdunnter+kolloider+systeme.">Zur Rontgenkleinwinkelstreuung verdunnter kolloider systeme.</a> Acta Phys. Austriaca. 14, 185-211 (1961).</li><li>Schulz, G. Z. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=&#220;ber+die+Kinetik+der+Kettenpolymerisationen.">&#220;ber die Kinetik der Kettenpolymerisationen.</a> Z. Phys. Chem. 43, 25 (1935).</li><li>. Neutron activation and scattering calculator Available from: <a target="_blank" href="https://www.ncnr.nist.gov/resources/activation">https://www.ncnr.nist.gov/resources/activation</a> (2017)</li><li>Kline, S. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reduction+and+Analysis+of+SANS+and+USANS+Data+Using+IGOR+Pro.">Reduction and Analysis of SANS and USANS Data Using IGOR Pro.</a> J. Appl. Crystallogr. 39 (6), 895-900 (2006).</li><li>Guinier, A., Fournet, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Small-Angle Scattering of X-Rays. , (1955).</li></ol>

Først angiver ser på SANS data som en funktion af temperatur, stigningen i elliptisk Cylinder Model skala faktor en markant stigning i mængden af P3HT i den nanofibril fase, som isconsistent med progression af gellation behandle . Samtidig faldet i gratis kæde Rg parret med en stigning i Porod eksponent afslører, at de forværrede termodynamiske forhold forbundet med temperaturen falde forårsager en kæde sammenbrud i de P3HT kæder stadig til stede i løsning. Disse resultater, kombineret med de USANS d...

Konjugeret polymerer lover funktionelle materialer, der kan udnyttes i en bred vifte af enheder, såsom organisk lysemitterende dioder, organiske halvledere, kemiske sensorer og organiske solceller. 1 , 2 , 3 , 4 , 5 , 6 et afgørende aspekt af ydeevnen i disse enheder er bestilling og pakning af konjugeret polymer i fast tilstand i det aktive lag. 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 denne morfologi er i høj grad forudbestemt af begge kropsbygning af polymer kæde i løsning samt de strukturer, der udvikles som disse løsninger er støbt til et substrat og opløsningsmidlet er fjernet. Ved at studere de strukturer, der findes overalt i en typisk sol-gel overgang af en model optoelektroniske polymer i et passende opløsningsmiddel, disse systemer kan være effektivt modelleret og en kvantitativ indblik i den samlesæt, der opstår under materiale deposition kan opnås. 15 , 16 , 17 , 18 , 19 , 20
Konkret har undersøge vi konjugeret polymer benchmark P3HT i den solvente deutereret ortho-dichlorbenzen (ODCB), en polymer-opløsningsmiddel system, som har set udstrakt brug på grund af dets egnethed til en lang række organiske elektronisk indretning fabrikation teknikker. 23 , 24 , 25 i denne givet opløsningsmiddel miljø, P3HT kæder begynder at aggregere ved en passende miljømæssige stimuli, såsom temperatur fald eller tab af opløsningsmiddel kvalitet. Den nøjagtige mekanisme for denne forsamling proces er omfattet af undersøgelsen, med en af de førende foreslåede veje menes for at være en gradvis proces, hvor individuelle P3HT molekyler π-stakken til at danne gråt nano-aggregater kendt som nanofibrils, som så selv vedblive for at danne større micron skala makro-aggregater. 24 forståelse af disse veje og de deraf følgende strukturer dannet er nøglen til korrekt at forudsige og påvirke dannelsen af optimal enhed aktive lag morfologier.
Denne ultimative mål mere netop lede dannelsen af disse aktive lag arkitekturer, findes der et behov for at udvikle yderligere eksperimentelle og industrielle metoder til ikke-destruktivt alter konjugeret polymer morfologi in situ. En forholdsvis ny metode centre rundt om brugen af lys eksponering som et billigt middel til at ændre polymer kæde morfologi, med både beregningsmæssige og eksperimentelle resultater peger mod dens gennemførlighed. 25 , 26 , 27 seneste arbejde af vores laboratorium har angivet eksistensen af en lys induceret ændring af konjugeret polymer-opløsningsmiddel interaktionen i en fortyndet opløsning, fører til en bemærkelsesværdig ændring i polymer kæde størrelse på belysning. 30 , 31 her, vil vi præsentere en protokol for at fortsætte dette arbejde ved effektivt overvåge virkningerne af udsætter en langt mere koncentreret konjugeret polymer løsning for direkte lys i en gellation proces, der er instrueret af en termostat-styret temperatur rampe. Vi ansætter neutron spredning, da det giver mulighed for robust analyse af strukturelle parametre af polymer-opløsningsmiddel sol-gel system på længdeskalaer fra oxidlag til mikron, en evne ikke muligt gennem andre mere almindelige rheologiske eller spektroskopiske instrumental metoder. 16 , 17 , 30 , 31 derfor, ved at sammenligne den korrekt analyseret lille og ultra-lille vinkel neutron data til samling af geler dannet under belysning til identiske data indsamlet i komplet mørke, strukturelle forskelle anlagt den ved belysning-drevet virkninger kan være omfattende identificeres og kvantificeres.

<table border="0" cellpadding="0" cellspacing="0" width="822">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:353px;">M(106) poly(3-hexylthiophene-2,5-diyl) (P3HT)</td>
			<td style="width:143px;">Ossila</td>
			<td style="width:160px;">104934-50-1</td>
			<td style="width:167px;">Conjugated polymer</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;">deuterated 1,2 ortho-dichlorobenzene (ODCB)</td>
			<td style="width:143px;">Sigma Aldrich</td>
			<td>AC321260050</td>
			<td>solvent</td>
		</tr>
	</tbody>
</table>

monitoring the effects of illumination on the structure of conjugated polymer gels using neutron scattering

Vi demonstrere en protokol for at overvåge effektivt gellation processen med en høj koncentration løsning af konjugeret polymer både tilstedeværelse og fravær af hvidt lys eksponering. Ved at indføre en kontrolleret temperatur rampe, kan gellation af disse materialer netop overvåges som de går gennem denne strukturelle udvikling, som effektivt spejler betingelserne erfarne løsning deposition fase af økologisk elektronisk indretning fabrikation. Ved hjælp af small angle neutron scattering (SANS) og ultra-små angle neutron scattering (USANS) sammen med passende montering protokoller kvantificere vi udviklingen i udvalgte strukturelle parametre i hele denne proces. Grundig analyse viser, at fortsatte lys eksponering under hele gellation markant ændrer strukturen af de i sidste ende dannede gel. Specifikt, sammenlægning processen af poly(3-hexylthiophene-2,5-diyl) (P3HT) nano-skala aggregater er negativt påvirket af tilstedeværelsen af belysning, i sidste ende resulterer i retardering af vækst i konjugeret polymer mikrostrukturer og den dannelsen af mindre skala makro-samlet klynger.

Gennem SANS og USANS eksperimenter, at gellation P3HT i d-ODCB blev effektivt overvåget fra tilstanden spredte løsning ved 70 ° C til en fuldt geléagtig tilstand ved 20 ° C. Disse eksperimenter blev udført i både mørke og under hvide lys belysning. Figur 1 viser nogle eksempel SANS reduceret data kurver fra disse forsøg, med et eksempel kurven passer vist i figur 2. Fra disse data, de strukturelle ændringer sker, når t...

Watch this Scientific Journal Video about Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering at JoVE.com

Monitoring the Effects of Illumination on the Structure of Conjugated Polymer Gels Using Neutron Scattering

En protokol til analyse af geler dannes fra optoelektroniske konjugeret polymer poly(3-hexylthiophene-2,5-diyl) (P3HT) ved hjælp af lille og ultra-små angle neutron scattering i både tilstedeværelse og fravær af belysning er præsenteret.

Overvågning af virkningerne af belysning af konjugeret Polymer geler ved hjælp af Neutron Scattering struktur

We demonstrate a protocol to effectively monitor the gelation process of a high concentration solution of conjugated polymer both in the presence and ...

Research

JoVE Journal

Chemistry

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR

Copper (I) binding by metallochaperone transport proteins prevents copper oxidation and release of the toxic ions that may participate in harmful redox ...

Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides

Udarbejdelse af meget porøse Koordinering Polymer Belægninger på Makroporøse Polymer Monoliths for styrkede Berigelse af phosphopeptider

We describe a protocol for the preparation of hybrid materials based on highly porous coordination polymer coatings on the internal surface of macroporous ...

Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers

Fotodynamisk terapi med Blended ledende polymer / fulleren Nanopartikel Fotosensibilisatorer

In this article a method for the fabrication and reproducible in-vitro evaluation of conducting polymer nanoparticles blended with fullerene as the next ...

Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes

Layer-by-lags Syntese og overførsel af Fritstående Konjugerede Mikroporøse Polymer Nanomembranes

CMP as large surface area materials have attracted growing interest recently, due to their high variability in the incorporation of functional groups in ...

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Funktionalisering af Single-walled kulstofnanorør med Thermo-vendbare blokcopolymerer og karakterisering af Small-angle Neutron Scattering

We demonstrate a protocol for single-walled carbon nanotube functionalization using thermo-sensitive PEO-PPO-PEO triblock copolymers in an aqueous ...

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Fremstillingen og egenskaberne af Thermo-reversibelt Tværbundet Rubber Via Diels-Alder Kemi

A method for using Diels Alder thermo-reversible chemistry as cross-linking tool for rubber products is demonstrated. In this work, a commercial ...

Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation

Elektrokemiske impedans spektroskopi som et redskab for elektrokemisk sats konstant estimering

Electrochemical impedance spectroscopy (EIS) was used for advanced characterization of organic electroactive compounds along with cyclic voltammetry (CV). ...

Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds

Raman og IR Spectroelectrochemical metoder som redskaber til at analysere konjugeret organiske forbindelser

In the presented work, two spectroelectrochemical techniques are discussed as tools for the analysis of the structural changes occurring in the molecule ...

Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

Ved hjælp af cyklisk Voltammetry, UV-Vis-NIR og EPR Spectroelectrochemistry til at analysere organiske forbindelser

Cyclic voltammetry (CV) is a technique used in the analysis of organic compounds. When this technique is combined with electron paramagnetic resonance ...