Name: microhoneycomb monoliths prepared by the unidirectional freeze-drying of cellulose nanofiber based sols: method and extensions
Uploaded: 2018-05-24T13:30:00
Description: Watch this Scientific Journal Video about Microhoneycomb Monoliths Prepared by the Unidirectional Freeze-drying of Cellulose Nanofiber Based Sols: Method and Extensions at JoVE.com

Dette arbejde blev støttet af den nationale grundlæggende forskning Program af Kina (2014CB932400), National Natural Science Foundation of China (nr. 51525204 og U1607206) og Shenzhen grundlæggende forskningsprojekt (nr. JCYJ20150529164918735). Vi vil også gerne takke Daicel-Allnex Ltd. og JSR Co for venligt formidlende polyurethaner og styren butadien gummi, henholdsvis.

1. forberedelse af 1 wt % 2,2,6,6-Tetramethylpiperidin-1-oxyl (TEMPO)-medieret oxideret Cellulose Nanofiber (TOCN) Sol
Bemærk: Sol er defineret som en kolloid suspension af meget små solide partikler i en kontinuerlig flydende medium.
<ol><li>Suspendere 66,7 g af Nadelholz bleget kraftpapir papirmasse (NBKP, der indeholder 12 g af cellulose) i 700 mL deioniseret vand (DI) vand med en mekanisk omrører på 300 rpm i 20 min.</li>
	<li>Der tilsættes 20 mL vandig TEMPO opløsning (indeholder ...

<ol>
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R., Nishihara, H., Tamon, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Formation+of+monolithic+silica+gel+microhoneycombs+(SMHs)+using+pseudosteady+state+growth+of+microstructural+ice+crystals.">Formation of monolithic silica gel microhoneycombs (SMHs) using pseudosteady state growth of microstructural ice crystals.</a> Chem. Commun. (7), 874-875 (2004).</li><li>Gutie&#180;rrez, M. C., 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=Macroporous+3D+Architectures+of+Self-Assembled+MWCNT+Surface+Decorated+with+Pt+Nanoparticles+as+Anodes+for+a+Direct+Methanol+Fuel+Cell.">Macroporous 3D Architectures of Self-Assembled MWCNT Surface Decorated with Pt Nanoparticles as Anodes for a Direct Methanol Fuel Cell.</a> J. Phys. Chem. C. 111, 5557-5560 (2007).</li><li>Mukai, S. R., Nishihara, H., Tamon, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Morphology+maps+of+ice-templated+silica+gels+derived+from+silica+hydrogels+and+hydrosols.">Morphology maps of ice-templated silica gels derived from silica hydrogels and hydrosols.</a> Micropor. Mesopor. Mat. 116 (1-3), 166-170 (2008).</li><li>Okaji, R., Taki, K., Nagamine, S., Ohshima, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Preparation+of+porous+honeycomb+monolith+from+UV-curable+monomer/dioxane+solution+via+unidirectional+freezing+and+UV+irradiation.">Preparation of porous honeycomb monolith from UV-curable monomer/dioxane solution via unidirectional freezing and UV irradiation.</a> J. Appl. Polym. Sci. 125 (4), 2874-2881 (2012).</li><li>Pan, Z. -. 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Det mest afgørende skridt for at nå MHMs er trinnet unidirectional frysepunktet under vand størkner for at danne søjleformede iskrystaller og skubbe dispersoid afsat til at danne rammerne. Unidirectional frysepunktet processen involverer grundlæggende termisk overførsel mellem forløber sol og kølevæske. I vores setup, var en dyppe maskine bruges til at indsætte en PP rør indeholdende en forløber sol i kølervæske (flydende kvælstof) med en konstant hastighed. Da flydende kvælstof holder fordamper hele tide...

Som et helt nyt materiale, microhoneycomb monolith (betegnes MHM) har for nylig tiltrak sig enorm opmærksomhed fra tværfaglig felter1,2,3,4,5, 6 , 7 , 8. the MHM blev først udarbejdet af S. Mukai et al. gennem en modificeret envejs Frysetørring (UDF) tilgang som en monolith med en bred vifte af lige microchannels med honeycomb-lignende tværsnit9. MHM besidder de generelle fordele af honeycomb strukturer, dvs., effektiv tessellation, høj styrke / vægt-forhold og lavt trykfald. Derudover har sammenlignet med honeycomb monolith med en kanal er større, MHM en meget større specifikke overflade område. UDF metode indebærer envejs væksten af iskrystaller og samtidige faseadskillelse ved frysning. Efter fjernelse af is krystaller opnås en solid komponent formet af isen krystal. Morfologi dannes ved faseadskillelse afhænger den iboende karakter af forstadie (sol eller gel), og i de fleste tilfælde, lamel10, fiber11, og fishbone12 strukturer er tilbøjelige til at danne i stedet for MHMs. Som et resultat, dannelsen af MHMs er blevet rapporteret kun i begrænset prækursorer, og det har betydeligt hæmmet mangfoldigheden af deres kemiske ejendom. Vi har for nylig fundet, at cellulose nanofibers har en stærk struktur-lede funktion mod danner strukturen MHM gennem UDF proces13. Simpelthen ved at blande cellulose nanofibers med andre vand-spredbar komponenter, er det muligt at udarbejde en række MHMs med forskellige kemiske egenskaber. Derudover er deres udvendige former og kanal størrelser fleksibelt og nemt kontrolleret13. Således forventes MHMs at blive brugt som filtre, katalysator understøtter, flow-type elektroder, sensorer og stilladser for biomaterialer.
I dette papir forklare vi først den grundlæggende forberedelse teknik af MHMs fra den vandig dispersion af cellulose nanofibers gennem UDF processen i detaljer. Derudover viser vi udarbejdelsen af flere forskellige typer af sammensatte MHMs.

<table border="0" cellpadding="0" cellspacing="0" width="572">
	<tbody>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Nadelholz Bleached Kraft Pulp</td>
			<td style="width:100px;">Seioko PMC company</td>
			<td style="width:89px;">CSF=600</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">TEMPO</td>
			<td style="width:100px;">Macklin Inc.</td>
			<td style="width:89px;">T819129</td>
			<td style="width:167px;">98%</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">NaBr</td>
			<td style="width:100px;">Macklin Inc.</td>
			<td style="width:89px;">S818075</td>
			<td style="width:167px;">AR, 99%</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">NaClO</td>
			<td style="width:100px;">Aladin Inc.</td>
			<td style="width:89px;">S101636</td>
			<td style="width:167px;">6-14 wt% active chlorine basis</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">SBR colloid</td>
			<td style="width:100px;">JSR corp.</td>
			<td style="width:89px;">TRD102A</td>
			<td style="width:167px;">48.5 wt%</td>
		</tr>
		<tr height="84">
			<td height="84" style="height:84px;width:216px;">TiO2</td>
			<td style="width:100px;">Sinopharm Chemical Reagent Co., Ltd.</td>
			<td style="width:89px;">A63725402</td>
			<td style="width:167px;">crystalline anatase phase</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">carbon fiber</td>
			<td style="width:100px;">Shenzhen Xian&#8217;gu Ltd.</td>
			<td style="width:89px;">XGCP-300</td>
			<td style="width:167px;"></td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Nitric acid</td>
			<td style="width:100px;">Huada Reagent Ltd.</td>
			<td style="width:89px;">7697-37-2</td>
			<td style="width:167px;">65-68 wt%</td>
		</tr>
		<tr height="42">
			<td height="42" style="height:42px;width:216px;">Mixer</td>
			<td style="width:100px;">Scientific Industries, Inc</td>
			<td style="width:89px;">G-560</td>
			<td style="width:167px;">the mixer&#160;</td>
		</tr>
		<tr height="63">
			<td height="63" style="height:63px;width:216px;">Mechanical blender</td>
			<td style="width:100px;">Waring Lab Ltd.</td>
			<td style="width:89px;">MX1000XTX</td>
			<td style="width:167px;">For disintegrating cellulose bundles into nanofibers.</td>
		</tr>
		<tr height="46">
			<td height="46" style="height:46px;width:216px;">Homogenizer</td>
			<td style="width:100px;">Scientz Ltd.</td>
			<td style="width:89px;">HXF-DY</td>
			<td style="width:167px;">For dispersing TiO2 nanoparticles</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:216px;">pH meter&#160;</td>
			<td style="width:100px;">Horiba Ltd.</td>
			<td style="width:89px;">F-74BW</td>
			<td></td>
		</tr>
	</tbody>
</table>

microhoneycomb monoliths prepared by the unidirectional freeze-drying of cellulose nanofiber based sols: method and extensions

Monolitisk honeycomb strukturer har været attraktivt at tværfaglige områder på grund af deres høje styrke / vægt-forhold. Især forventes microhoneycomb Monoliter (MHMs) med mikrometer skala kanaler som effektiv platforme for reaktioner og separationer på grund af deres store overflade områder. Hidtil har MHMs udarbejdet af en envejs Frysetørring (UDF) metode kun fra meget begrænset prækursorer. Heri, rapporterer vi en protokol, hvor der kan indhentes en serie af MHMs består af forskellige komponenter. For nylig fandt vi denne cellulose nanofibers funktion som en tydelig struktur-lede agent mod dannelsen af MHMs gennem UDF. Ved at blande cellulose nanofibers med vand opløselige stoffer, som ikke giver MHMs, kan være forberedt en række sammensatte MHMs. Dette beriger betydeligt MHMs kemiske forfatning mod alsidige applikationer.

Morfologier for forskellige positioner, MHM-TOCN langs retning af unidirectional frysepunktet er undersøgt og vist i figur 2. Med den holdning at være længere væk fra den nederste del af MHM-TOCN, en gradvis morfologi ændring blev afsløret (figur 2, diskussion). Ved at indføre en anden komponent i TOCN sol til at danne en homogen blanding sol, er det muligt at forberede forskellige slags sammensatte MHMs. ...

Watch this Scientific Journal Video about Microhoneycomb Monoliths Prepared by the Unidirectional Freeze-drying of Cellulose Nanofiber Based Sols: Method and Extensions at JoVE.com

Microhoneycomb Monoliths Prepared by the Unidirectional Freeze-drying of Cellulose Nanofiber Based Sols: Method and Extensions

Vi præsenterer her, en generel protokol for at forberede en række microhoneycomb Monoliter (MHMs) i hvilken væske kan passere gennem med et ekstremt lavt trykfald. MHMs opnåede forventes at blive brugt som filtre, katalysator understøtter, flow-type elektroder, sensorer og stilladser for biomaterialer.

Microhoneycomb Monoliter udarbejdet af den ensrettede frysetørring af Cellulose Nanofiber baseret Sols: metode og udvidelser

Monolithic honeycomb structures have been attractive to multidisciplinary fields due to their high strength-to-weight ratio. Particularly, microhoneycomb ...

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