溶胶组成对氧化铝纤维微观结构及性质的影响
|
摘要
以氯化铝和铝粉为铝源,水为溶剂,乙醇为辅助溶剂,采用溶胶-凝胶结合静电纺丝方法,制备了柔性γ和α氧化铝纤维,研究了溶胶中铝单体和Al_(13)组成情况对氧化铝纤维微观结构、物相转变和隔热性能的影响。溶胶中Al_(13)含量较多能推迟纤维的物相转变,使γ-Al_2O_3纤维的气孔和组成颗粒增大,降低γ-Al_2O_3纤维的比表面积,降低γ-Al_2O_3和α-Al_2O_3纤维的导热系数。S4组γ-Al_2O_3和α-Al_2O_3纤维的导热系数仅为0.08087和0.1251 W/m·k。研究表明,溶胶中较高的Al_(13)含量有利于提高纤维材料的隔热性能。
Using aluminum chloride and aluminum as raw materials, pure water as solvent, ethanol as aid solvent, alumina sols containing different proportions of alumina monomer and Al_(13) were prepared. Gel fibers were prepared by electrospinning, and flexible flocculence γ-Al_2O_3 and α-Al_2O_3 fibers were fabricated. The impacts of sol composition on the microstructure of fibers, phase transformation and insulation performance were investigated. Al_(13) can delay the phase transformation of the fibers, more content of Al_(13) in sol can enlarge the size of pore and grain of γ-Al_2O_3 fibers, and reduce specific surface area as well as the thermal conductivity of alumina fibers. The thermal conductivity of γ and α alumina fibers prepared by S4 was only 0.08087 and 0.1251 W/m·k, indicating that high content of Al_(13) was good for improving the thermal insulation properties of the fibers.
Using aluminum chloride and aluminum as raw materials, pure water as solvent, ethanol as aid solvent, alumina sols containing different proportions of alumina monomer and Al_(13) were prepared. Gel fibers were prepared by electrospinning, and flexible flocculence γ-Al_2O_3 and α-Al_2O_3 fibers were fabricated. The impacts of sol composition on the microstructure of fibers, phase transformation and insulation performance were investigated. Al_(13) can delay the phase transformation of the fibers, more content of Al_(13) in sol can enlarge the size of pore and grain of γ-Al_2O_3 fibers, and reduce specific surface area as well as the thermal conductivity of alumina fibers. The thermal conductivity of γ and α alumina fibers prepared by S4 was only 0.08087 and 0.1251 W/m·k, indicating that high content of Al_(13) was good for improving the thermal insulation properties of the fibers.
引文
[1] Zhang P P,Jiao X L,Chen D R,et al.Fabrication of electrospun Al2O3 fibers with CaO-SiO2 additive[J].Mater.Lett.,2013,91:23-26.
[2] Su V,Terehov M,Clyne B.Filtration performance of membranes produced using nanoscale alumina fibers (NAF) [J].Adv.Eng.Mater.,2012,14(12):1088-1096.
[3] Kang W M,Cheng B W,Li Q X,et al.A new method for preparing alumina nanofibers by electrospinning technology[J].Text.Res.J.,2011,81(2):148-155.
[4] Zhang P P,Chen D R,Jiao X L.Fabrication of flexible α-alumina fibers composed of nanosheets[J].Eur.J.Inorg.Chem.,2012(26):4167-4173.
[5] Azad A M.Fabrication of transparent alumina (Al2O3) nanofibers by electrospinning[J].Mater.Sci.Eng.A,2006,435-436:468-473.
[6] Zhang S,Cao X Y,Ma Y M.Fabrication of alumina ribbons with mixed solvent system in electrospinning[J].J.Optoelectron.Adv.Mater.,2011,13:425-427.
[7] Mahapatra A,Mishra B G,Hota G.Studies on electrospun alumina nanofibers for the removal of chromium(VI) and fluoride toxic ions from an aqueous system[J].Ind.Eng.Chem.Res.,2012,52(4):1554-1561.
[8] Yu H,Guo J,Zhu S Q,et al.Preparation of continuous alumina nanofibers via electrospinning of PAN/DMF solution[J].Mater.Lett.,2012,74:247-249.
[9] Tan E P S,Lim C T.Physical properties of a single polymeric nanofiber[J].Appl.Phys.Lett.,2004,84:1603-1605.
[10] Li D,Xia Y N.Electrospinning of nanofibers:reinventing the wheel[J].Adv.Mater.,2004,16 (14):1151-1170.
[11] Bag S,Trikalitis P N,Chupas P J,et al.Porous semiconducting gels and aerogels from chalcogenide clusters[J].Science,2007,317(5837):490-493.
[12] Mohanan J L,Arachchige I U,Brock S L.Porous semiconductor chalcogenide aerogels[J].Science,2005,307(5708):397-400.
[13] Maneeratana V,Sigmund W M.Continuous hollow alumina gel fibers by direct electrospinning of an alkoxide-based precursor[J].Chem.Eng.J.,2008,137:137-143.
[14] Azad A M.Fabrication of transparent alumina (Al2O3) nanofibers by electrospinning[J].Mater.Sci.Eng.,A,2006,435-436:468-473.
[15] Panda P K,Ramakrishna S.Electrospinning of alumina nanofibers using different precursors[J].J.Mater.Sci.,2007,42:2189-2193.
[16] Akitt J W,Farthing A.Aluminium-27 nuclear magnetic resonance studies of the hydrolysis of aluminium(III).Part 2.Gel-permeation chromatography[J].J.Chem.Soc.Dalton Trans.,1981(7):1606-1608.
[17] Chen Z Y,Luan Z K,Fan J H,et al.Effect of thermal treatment on the formation and transformation of Keggin Al13 and Al30 species in hydrolytic polymeric aluminum solutions[J].Colloid Surf.A-Physicochem.Eng.Asp.,2007,292:110-118.
[18] Wang W,Wentz K M,Hayes S E,et al.Synthesis of the hydroxide cluster [Al13(μ3-OH)6(μ-OH)18(H2O)24]15+ from an aqueous solution[J].Inorg.Chem.,2011,50(11):4683-4685.
[19] Qian Z S,Feng H,Yang W J,et al.Supermolecule density functional calculations on the water exchange of aquated Al(iii) species in aqueous solution[J].Chem.Commun.,2008(33):3930-3932.
[20] Kang L S,Han S W,Jung C W.Synthesis and characterization of polymeric inorganic coagulants for water treatment[J].Korean J.Chem.Eng.,2001,18(6):965-970.
[21] Chen Z Y,Luan Z K,Jia Z P,et al.Study on the hydrolysis/precipitation behavior of Keggin Al13 and Al30 polymers in polyaluminum solutions[J].J.Environ.Manage.,2009,90:2831-2840.
[22] Qian Z S,Feng H,Yang W J,et al.Theoretical investigation of water exchange on the nanometer-sized polyoxocation AlO4Al12(OH)24(H2O)127+ (Keggin-Al13) in aqueous solution[J].J.Am.Chem.Soc.,2008,130(44):14402-14403.
[23] 居学海,范晓薇,马海霞,等.水合铝离子单体和二聚体的DFT研究[J].环境化学,2007,26(3):347-351.
[24] Parthasarathy N,Buffle J.Study of polymeric aluminium(iii) hydroxide solutions for application in waste water treatment.properties of the polymer and optimal conditions of preparation[J].Water Res.,1985,19:25-36.
[25] Venkatesh R,Ramanan S R.Influence of processing variables on the microstructure of sol-gel spun alumina fibres[J].Mater.Lett.,2002,55:189-195.
[26] 王趁义,罗明标,毕树平.环境中羟基聚合铝型体的形成和形态转化规律[J].分析科学学报,2003,19(4):383-388.
[27] Annenkov V V,Filina E A,Danilovtseva E N,et al.Aluminum complexes with a donor polymer:new route to organic/inorganic polymer hybrids[J].J.Sol-Gel Sci.Technol.,2003,27(2):163-166.
[28] Allouche L,Taulelle F.Conversion of Al13 Keggine ε into Al30:a reaction controlled by aluminum monomers[J].Inorg.Chem.Commun.,2003,6:1167-1170.
[29] Casey W H.Large Aqueous aluminum hydroxide molecules[J].Chem.Rev.,2005,106(1):1-16.
[30] Wang S L,Wang M K,Tzou Y M.Effect of temperatures on formation and transformation of hydrolytic aluminum in aqueous solutions[J].Colloid Surf.A Physicochem.Eng.Asp.,2003,231:143-157.
[31] Yalcin D,Ozcalik O,Altiok E,et al.Characterization and recovery of tartaric acid from wastes of wine and grape juice industries[J].J.Therm.Anal.Calorim.,2008,94(3):767-771.
[32] Nuansing W,Ninmuang S,Jarernboon W,et al.Structural characterization and morphology of electrospun TiO2 nanofibers[J].Mater.Sci.Eng.B,2006,131:147-155.
[33] Mahapatra A,Mishra B G,Hota G.Synthesis of ultra-fine a-Al2O3 fibers via electrospinning method[J].Ceram.Int.,2011,37:2329-2333.
[34] Chen X T,Gu L X.The sol-gel transition of mullite spinning solution in relation to the formation of ceramic fibers[J].J.Sol-Gel Sci.Tech.,2008,46(1):23-32.
[35] Chandradass J,Balasubramanian M.Sol-gel processing of alumina fibres[J].J.Mater.Process.Tech.,2006,173:275-280.
[36] Chiou Y H,Tsai M T,Shih H C.The preparation of alumina fibre by sol-gel processing[J].J.Mater.Sci.,1994,29 (9):2378-2388.
[37] Yogo T,Iwahara H.Synthesis of α-alumina fibre from modified aluminium alkoxide precursor[J].J.Mater.Sci.,1992,27(6):1499-1504.
[38] Sing K S W,Everett D H,Haul R A W,et al.Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity[J].Pure.Appl.Chem.,1984,57(4):603-619.
[39] 张娜,张玉军,田庭艳,等.高温低热导率隔热材料的研究现状及进展[J].中国陶瓷,2006,42(1):16-18.
[2] Su V,Terehov M,Clyne B.Filtration performance of membranes produced using nanoscale alumina fibers (NAF) [J].Adv.Eng.Mater.,2012,14(12):1088-1096.
[3] Kang W M,Cheng B W,Li Q X,et al.A new method for preparing alumina nanofibers by electrospinning technology[J].Text.Res.J.,2011,81(2):148-155.
[4] Zhang P P,Chen D R,Jiao X L.Fabrication of flexible α-alumina fibers composed of nanosheets[J].Eur.J.Inorg.Chem.,2012(26):4167-4173.
[5] Azad A M.Fabrication of transparent alumina (Al2O3) nanofibers by electrospinning[J].Mater.Sci.Eng.A,2006,435-436:468-473.
[6] Zhang S,Cao X Y,Ma Y M.Fabrication of alumina ribbons with mixed solvent system in electrospinning[J].J.Optoelectron.Adv.Mater.,2011,13:425-427.
[7] Mahapatra A,Mishra B G,Hota G.Studies on electrospun alumina nanofibers for the removal of chromium(VI) and fluoride toxic ions from an aqueous system[J].Ind.Eng.Chem.Res.,2012,52(4):1554-1561.
[8] Yu H,Guo J,Zhu S Q,et al.Preparation of continuous alumina nanofibers via electrospinning of PAN/DMF solution[J].Mater.Lett.,2012,74:247-249.
[9] Tan E P S,Lim C T.Physical properties of a single polymeric nanofiber[J].Appl.Phys.Lett.,2004,84:1603-1605.
[10] Li D,Xia Y N.Electrospinning of nanofibers:reinventing the wheel[J].Adv.Mater.,2004,16 (14):1151-1170.
[11] Bag S,Trikalitis P N,Chupas P J,et al.Porous semiconducting gels and aerogels from chalcogenide clusters[J].Science,2007,317(5837):490-493.
[12] Mohanan J L,Arachchige I U,Brock S L.Porous semiconductor chalcogenide aerogels[J].Science,2005,307(5708):397-400.
[13] Maneeratana V,Sigmund W M.Continuous hollow alumina gel fibers by direct electrospinning of an alkoxide-based precursor[J].Chem.Eng.J.,2008,137:137-143.
[14] Azad A M.Fabrication of transparent alumina (Al2O3) nanofibers by electrospinning[J].Mater.Sci.Eng.,A,2006,435-436:468-473.
[15] Panda P K,Ramakrishna S.Electrospinning of alumina nanofibers using different precursors[J].J.Mater.Sci.,2007,42:2189-2193.
[16] Akitt J W,Farthing A.Aluminium-27 nuclear magnetic resonance studies of the hydrolysis of aluminium(III).Part 2.Gel-permeation chromatography[J].J.Chem.Soc.Dalton Trans.,1981(7):1606-1608.
[17] Chen Z Y,Luan Z K,Fan J H,et al.Effect of thermal treatment on the formation and transformation of Keggin Al13 and Al30 species in hydrolytic polymeric aluminum solutions[J].Colloid Surf.A-Physicochem.Eng.Asp.,2007,292:110-118.
[18] Wang W,Wentz K M,Hayes S E,et al.Synthesis of the hydroxide cluster [Al13(μ3-OH)6(μ-OH)18(H2O)24]15+ from an aqueous solution[J].Inorg.Chem.,2011,50(11):4683-4685.
[19] Qian Z S,Feng H,Yang W J,et al.Supermolecule density functional calculations on the water exchange of aquated Al(iii) species in aqueous solution[J].Chem.Commun.,2008(33):3930-3932.
[20] Kang L S,Han S W,Jung C W.Synthesis and characterization of polymeric inorganic coagulants for water treatment[J].Korean J.Chem.Eng.,2001,18(6):965-970.
[21] Chen Z Y,Luan Z K,Jia Z P,et al.Study on the hydrolysis/precipitation behavior of Keggin Al13 and Al30 polymers in polyaluminum solutions[J].J.Environ.Manage.,2009,90:2831-2840.
[22] Qian Z S,Feng H,Yang W J,et al.Theoretical investigation of water exchange on the nanometer-sized polyoxocation AlO4Al12(OH)24(H2O)127+ (Keggin-Al13) in aqueous solution[J].J.Am.Chem.Soc.,2008,130(44):14402-14403.
[23] 居学海,范晓薇,马海霞,等.水合铝离子单体和二聚体的DFT研究[J].环境化学,2007,26(3):347-351.
[24] Parthasarathy N,Buffle J.Study of polymeric aluminium(iii) hydroxide solutions for application in waste water treatment.properties of the polymer and optimal conditions of preparation[J].Water Res.,1985,19:25-36.
[25] Venkatesh R,Ramanan S R.Influence of processing variables on the microstructure of sol-gel spun alumina fibres[J].Mater.Lett.,2002,55:189-195.
[26] 王趁义,罗明标,毕树平.环境中羟基聚合铝型体的形成和形态转化规律[J].分析科学学报,2003,19(4):383-388.
[27] Annenkov V V,Filina E A,Danilovtseva E N,et al.Aluminum complexes with a donor polymer:new route to organic/inorganic polymer hybrids[J].J.Sol-Gel Sci.Technol.,2003,27(2):163-166.
[28] Allouche L,Taulelle F.Conversion of Al13 Keggine ε into Al30:a reaction controlled by aluminum monomers[J].Inorg.Chem.Commun.,2003,6:1167-1170.
[29] Casey W H.Large Aqueous aluminum hydroxide molecules[J].Chem.Rev.,2005,106(1):1-16.
[30] Wang S L,Wang M K,Tzou Y M.Effect of temperatures on formation and transformation of hydrolytic aluminum in aqueous solutions[J].Colloid Surf.A Physicochem.Eng.Asp.,2003,231:143-157.
[31] Yalcin D,Ozcalik O,Altiok E,et al.Characterization and recovery of tartaric acid from wastes of wine and grape juice industries[J].J.Therm.Anal.Calorim.,2008,94(3):767-771.
[32] Nuansing W,Ninmuang S,Jarernboon W,et al.Structural characterization and morphology of electrospun TiO2 nanofibers[J].Mater.Sci.Eng.B,2006,131:147-155.
[33] Mahapatra A,Mishra B G,Hota G.Synthesis of ultra-fine a-Al2O3 fibers via electrospinning method[J].Ceram.Int.,2011,37:2329-2333.
[34] Chen X T,Gu L X.The sol-gel transition of mullite spinning solution in relation to the formation of ceramic fibers[J].J.Sol-Gel Sci.Tech.,2008,46(1):23-32.
[35] Chandradass J,Balasubramanian M.Sol-gel processing of alumina fibres[J].J.Mater.Process.Tech.,2006,173:275-280.
[36] Chiou Y H,Tsai M T,Shih H C.The preparation of alumina fibre by sol-gel processing[J].J.Mater.Sci.,1994,29 (9):2378-2388.
[37] Yogo T,Iwahara H.Synthesis of α-alumina fibre from modified aluminium alkoxide precursor[J].J.Mater.Sci.,1992,27(6):1499-1504.
[38] Sing K S W,Everett D H,Haul R A W,et al.Reporting physisorption data for gas/solid systems with special reference to the determination of surface area and porosity[J].Pure.Appl.Chem.,1984,57(4):603-619.
[39] 张娜,张玉军,田庭艳,等.高温低热导率隔热材料的研究现状及进展[J].中国陶瓷,2006,42(1):16-18.