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Free-flowing, transparent γ-alumina nanoparticles synthesized by a supersonic thermal plasma expansion process
Nanoparticles of crystalline, phase-pure γ-alumina is synthesized in a supersonically expanded thermal plasma jet assisted experimental chemical reactor, with good control over the average particle sizes independently with respect to plasma current, oxygen flow rate and the ambient pressure in the s...
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Published in: | Current applied physics 2012, 12(3), , pp.880-884 |
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container_title | Current applied physics |
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creator | Bora, B. Aomoa, N. Bordoloi, R.K. Srivastava, D.N. Bhuyan, H. Das, A.K. Kakati, M. |
description | Nanoparticles of crystalline, phase-pure γ-alumina is synthesized in a supersonically expanded thermal plasma jet assisted experimental chemical reactor, with good control over the average particle sizes independently with respect to plasma current, oxygen flow rate and the ambient pressure in the sample collection chamber. Most of the synthesized particle samples were seen to be transparent, which gets more transparent with decrease in the particle sizes. The lowest achievable pressure in the chamber had produced particles with average 10 nm sizes, which was best also in terms of narrow size distribution. Another important observation was the absence of serious inter-particle agglomeration, producing free-flowing particles. Optical emission spectroscopic technique was used to study the plasma chemistry of the reaction zone as well as the plasma jet.
► Crystalline, transparent, phase-pure γ-alumina nanoparticles by a plasma method. ► Control over sizes through plasma current, oxygen flow rate and chamber pressure. ► 9 mbar chamber pressure produced 10 nm sizes, smallest by a plasma method. ► Also, free-flowing, crystalline, best transparent with a narrow size distribution. ► Emission spectroscopy used for plasma diagnostics and to study the plasma chemistry. |
doi_str_mv | 10.1016/j.cap.2011.12.001 |
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► Crystalline, transparent, phase-pure γ-alumina nanoparticles by a plasma method. ► Control over sizes through plasma current, oxygen flow rate and chamber pressure. ► 9 mbar chamber pressure produced 10 nm sizes, smallest by a plasma method. ► Also, free-flowing, crystalline, best transparent with a narrow size distribution. ► Emission spectroscopy used for plasma diagnostics and to study the plasma chemistry.</description><subject>Agglomeration</subject><subject>Alumina</subject><subject>Chambers</subject><subject>Crystal structure</subject><subject>Nanoparticle-charging</subject><subject>Nanoparticles</subject><subject>Optical emission spectroscopy</subject><subject>oxygen</subject><subject>Particle size</subject><subject>Particle size distribution</subject><subject>physics</subject><subject>Plasma currents</subject><subject>Plasma synthesis</subject><subject>reaction chemistry</subject><subject>spectroscopy</subject><subject>Thermal plasmas</subject><subject>Transparent-ceramics</subject><subject>물리학</subject><issn>1567-1739</issn><issn>1878-1675</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2012</creationdate><recordtype>article</recordtype><recordid>eNqN0cFu1DAQBuAIgUQpfQBO-MiBBNtxbEecqopCpUqVaHu2HGeyeJvYwZMFltfqe_SZcFjEsXCy5fnm18hTFK8YrRhl8t22cnauOGWsYryilD0pjphWumRSNU_zvZGqZKpunxcvELcZSEHFURHPE0A5jPG7D5u3ZEk24GwThIU83Jd23E0-WBJsiPl18W4EJLgPyxdA_xN60u2JJbibIWEM3pFcSJMdyTxanCyBH3MO9DGQOUUHiC-LZ4MdEU7-nMfF7fmHm7NP5eXVx4uz08vSiaZeSsaos9S1TVc30Kuh1bapZU2Fkt3QU1nrbmBcSApSUyfU4HhNWeZWdI1qdX1cvDnkhjSYO-dNtP73uYnmLpnTzzcXhtF6Df1L84hfd4CLmTw6GEcbIO7QMNlyQbVW_N-Ucq51w2n7H5S1Uggu1lnZgboUERMMZk5-smmf0eqk2Zq8XbNu1zBu8vJyz-tDz2CjsZvk0dxeZ9CsRd4KlcX7g4D8zd88JIPOQ3DQ-wRuMX30j-T_AvaHtpE</recordid><startdate>20120501</startdate><enddate>20120501</enddate><creator>Bora, B.</creator><creator>Aomoa, N.</creator><creator>Bordoloi, R.K.</creator><creator>Srivastava, D.N.</creator><creator>Bhuyan, H.</creator><creator>Das, A.K.</creator><creator>Kakati, M.</creator><general>Elsevier B.V</general><general>한국물리학회</general><scope>FBQ</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QF</scope><scope>7QQ</scope><scope>7U5</scope><scope>8FD</scope><scope>JG9</scope><scope>L7M</scope><scope>ACYCR</scope></search><sort><creationdate>20120501</creationdate><title>Free-flowing, transparent γ-alumina nanoparticles synthesized by a supersonic thermal plasma expansion process</title><author>Bora, B. ; Aomoa, N. ; Bordoloi, R.K. ; Srivastava, D.N. ; Bhuyan, H. ; Das, A.K. ; Kakati, M.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c453t-110ca0c95b35ed7f98a53630476bfd0638bf12460e680c47fc230195ba4b57983</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2012</creationdate><topic>Agglomeration</topic><topic>Alumina</topic><topic>Chambers</topic><topic>Crystal structure</topic><topic>Nanoparticle-charging</topic><topic>Nanoparticles</topic><topic>Optical emission spectroscopy</topic><topic>oxygen</topic><topic>Particle size</topic><topic>Particle size distribution</topic><topic>physics</topic><topic>Plasma currents</topic><topic>Plasma synthesis</topic><topic>reaction chemistry</topic><topic>spectroscopy</topic><topic>Thermal plasmas</topic><topic>Transparent-ceramics</topic><topic>물리학</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Bora, B.</creatorcontrib><creatorcontrib>Aomoa, N.</creatorcontrib><creatorcontrib>Bordoloi, R.K.</creatorcontrib><creatorcontrib>Srivastava, D.N.</creatorcontrib><creatorcontrib>Bhuyan, H.</creatorcontrib><creatorcontrib>Das, A.K.</creatorcontrib><creatorcontrib>Kakati, M.</creatorcontrib><collection>AGRIS</collection><collection>CrossRef</collection><collection>Aluminium Industry Abstracts</collection><collection>Ceramic Abstracts</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Korean Citation Index</collection><jtitle>Current applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Bora, B.</au><au>Aomoa, N.</au><au>Bordoloi, R.K.</au><au>Srivastava, D.N.</au><au>Bhuyan, H.</au><au>Das, A.K.</au><au>Kakati, M.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Free-flowing, transparent γ-alumina nanoparticles synthesized by a supersonic thermal plasma expansion process</atitle><jtitle>Current applied physics</jtitle><date>2012-05-01</date><risdate>2012</risdate><volume>12</volume><issue>3</issue><spage>880</spage><epage>884</epage><pages>880-884</pages><issn>1567-1739</issn><eissn>1878-1675</eissn><abstract>Nanoparticles of crystalline, phase-pure γ-alumina is synthesized in a supersonically expanded thermal plasma jet assisted experimental chemical reactor, with good control over the average particle sizes independently with respect to plasma current, oxygen flow rate and the ambient pressure in the sample collection chamber. Most of the synthesized particle samples were seen to be transparent, which gets more transparent with decrease in the particle sizes. The lowest achievable pressure in the chamber had produced particles with average 10 nm sizes, which was best also in terms of narrow size distribution. Another important observation was the absence of serious inter-particle agglomeration, producing free-flowing particles. Optical emission spectroscopic technique was used to study the plasma chemistry of the reaction zone as well as the plasma jet.
► Crystalline, transparent, phase-pure γ-alumina nanoparticles by a plasma method. ► Control over sizes through plasma current, oxygen flow rate and chamber pressure. ► 9 mbar chamber pressure produced 10 nm sizes, smallest by a plasma method. ► Also, free-flowing, crystalline, best transparent with a narrow size distribution. ► Emission spectroscopy used for plasma diagnostics and to study the plasma chemistry.</abstract><pub>Elsevier B.V</pub><doi>10.1016/j.cap.2011.12.001</doi><tpages>5</tpages></addata></record> |
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subjects | Agglomeration Alumina Chambers Crystal structure Nanoparticle-charging Nanoparticles Optical emission spectroscopy oxygen Particle size Particle size distribution physics Plasma currents Plasma synthesis reaction chemistry spectroscopy Thermal plasmas Transparent-ceramics 물리학 |
title | Free-flowing, transparent γ-alumina nanoparticles synthesized by a supersonic thermal plasma expansion process |
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