Effect of pH on the combustion synthesis of nano-crystalline alumina powder
Synthesis of nano-crystalline alumina powder by a chemical pyrophoric reaction using citric acid and ammonia was investigated by varying the pH of the precursor solution, which played an important role in controlling the morphology of the synthesised powder. The flaky morphology obtained at pH=2 cou...
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| Veröffentlicht in: | Materials letters 2002-12, Vol.57 (2), p.380-385 |
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| container_title | Materials letters |
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| creator | Pathak, L.C Singh, T.B Das, S Verma, A.K Ramachandrarao, P |
| description | Synthesis of nano-crystalline alumina powder by a chemical pyrophoric reaction using citric acid and ammonia was investigated by varying the pH of the precursor solution, which played an important role in controlling the morphology of the synthesised powder. The flaky morphology obtained at pH=2 could be modified to fine desegregated particulate form by varying the pH of the solution to 10. The sluggish decomposition rate at low pH was found to be responsible for the generation of flaky powders, whereas the rapid decomposition at high pH=10 yielded the fine desegregated powders. The as-prepared powders were amorphous in nature, which yielded the nano-crystalline alumina powder after calcination at elevated temperatures. |
| doi_str_mv | 10.1016/S0167-577X(02)00796-6 |
| format | Article |
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The flaky morphology obtained at pH=2 could be modified to fine desegregated particulate form by varying the pH of the solution to 10. The sluggish decomposition rate at low pH was found to be responsible for the generation of flaky powders, whereas the rapid decomposition at high pH=10 yielded the fine desegregated powders. 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The flaky morphology obtained at pH=2 could be modified to fine desegregated particulate form by varying the pH of the solution to 10. The sluggish decomposition rate at low pH was found to be responsible for the generation of flaky powders, whereas the rapid decomposition at high pH=10 yielded the fine desegregated powders. The as-prepared powders were amorphous in nature, which yielded the nano-crystalline alumina powder after calcination at elevated temperatures.</description><subject>Alumina</subject><subject>Ceramics</subject><subject>Chemistry</subject><subject>Colloidal state and disperse state</subject><subject>Cross-disciplinary physics: materials science; rheology</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Materials science</subject><subject>Nanomaterials</subject><subject>Nanoscale materials and structures: fabrication and characterization</subject><subject>Nitrate–citrate process</subject><subject>Physics</subject><subject>Powder preparation</subject><subject>Powders</subject><subject>Solution combustion process</subject><issn>0167-577X</issn><issn>1873-4979</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><recordid>eNqNkMFKxDAQhoMouK4-gtCLoodqmqZJexJZVldc8KCCt5BME4y0SU1aZd_e7q7oUS8zzPDNP_AhdJzhiwxn7PJxLDwtOH85w-QcY16xlO2gSVbyPKUVr3bR5AfZRwcxvmGMaYXpBN3PjdHQJ94k3SLxLulfdQK-VUPs7TjGlRs30cY14aTzKYRV7GXTWKcT2QytdTLp_GetwyHaM7KJ-ui7T9HzzfxptkiXD7d3s-tlCpQVfSozbEARSSg1piQ1KJmrWilOmZHAM0Z0qWueF8ArWoHhuWGFUQUFQoGCyqfodJvbBf8-6NiL1kbQTSOd9kMUZMwoirL6D5hRTPAIFlsQgo8xaCO6YFsZViLDYu1YbByLtUCBidg4Fmy8O_l-ICPIxgTpwMbfY5ozQjb5V1tOj1o-rA4igtUOdG3DaF_U3v7x6Qsb-ZIT</recordid><startdate>20021201</startdate><enddate>20021201</enddate><creator>Pathak, L.C</creator><creator>Singh, T.B</creator><creator>Das, S</creator><creator>Verma, A.K</creator><creator>Ramachandrarao, P</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope><scope>7SR</scope></search><sort><creationdate>20021201</creationdate><title>Effect of pH on the combustion synthesis of nano-crystalline alumina powder</title><author>Pathak, L.C ; Singh, T.B ; Das, S ; Verma, A.K ; Ramachandrarao, P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c465t-a10fcb2a244ff82dcba3bdbb746fac7162e8ed735c7949cf73f65fb54c24c4cb3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Alumina</topic><topic>Ceramics</topic><topic>Chemistry</topic><topic>Colloidal state and disperse state</topic><topic>Cross-disciplinary physics: materials science; rheology</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Materials science</topic><topic>Nanomaterials</topic><topic>Nanoscale materials and structures: fabrication and characterization</topic><topic>Nitrate–citrate process</topic><topic>Physics</topic><topic>Powder preparation</topic><topic>Powders</topic><topic>Solution combustion process</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Pathak, L.C</creatorcontrib><creatorcontrib>Singh, T.B</creatorcontrib><creatorcontrib>Das, S</creatorcontrib><creatorcontrib>Verma, A.K</creatorcontrib><creatorcontrib>Ramachandrarao, P</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><collection>Engineered Materials Abstracts</collection><jtitle>Materials letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Pathak, L.C</au><au>Singh, T.B</au><au>Das, S</au><au>Verma, A.K</au><au>Ramachandrarao, P</au><au>WCA</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of pH on the combustion synthesis of nano-crystalline alumina powder</atitle><jtitle>Materials letters</jtitle><date>2002-12-01</date><risdate>2002</risdate><volume>57</volume><issue>2</issue><spage>380</spage><epage>385</epage><pages>380-385</pages><issn>0167-577X</issn><eissn>1873-4979</eissn><coden>MLETDJ</coden><abstract>Synthesis of nano-crystalline alumina powder by a chemical pyrophoric reaction using citric acid and ammonia was investigated by varying the pH of the precursor solution, which played an important role in controlling the morphology of the synthesised powder. 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| ispartof | Materials letters, 2002-12, Vol.57 (2), p.380-385 |
| issn | 0167-577X 1873-4979 |
| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Alumina Ceramics Chemistry Colloidal state and disperse state Cross-disciplinary physics: materials science rheology Exact sciences and technology General and physical chemistry Materials science Nanomaterials Nanoscale materials and structures: fabrication and characterization Nitrate–citrate process Physics Powder preparation Powders Solution combustion process |
| title | Effect of pH on the combustion synthesis of nano-crystalline alumina powder |
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