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A multi-technique study of the effect of aqueous aluminium speciation on hydrolytic gelation of aluminium (oxy)hydroxide

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Title: A multi-technique study of the effect of aqueous aluminium speciation on hydrolytic gelation of aluminium (oxy)hydroxide
Authors: Fournier, A.C.1, Shafran, K.L., Perry, C.C. carole.perry@ntu.ac.uk
Source: Journal of Colloid & Interface Science. Apr2009, Vol. 332 Issue 1, p122-129. 8p.
Subjects: Aluminum, Metal ions, Chemical speciation, Gelation, Aluminum hydroxide, Buffer solutions, Hydrolysis
Abstract: Abstract: The sol–gel transformation of aqueous solutions of aluminium ions into aluminium (oxy)hydroxides induced by the addition of a ‘soft base’—‘Tris-buffer’ () has been investigated using monotonous single-batch titrations and a combination of four complimentary techniques for monitoring pH, conductivity, viscosity and ultrasound parameters (velocity and attenuation). The multi-probe monitoring of the formation of aluminium (oxy)hydroxides enabled important stages of the sol–gel transformation process including: the structural conversion of aluminium Keggin-like polynuclear clusters into nanoparticles of aluminium (oxy)hydroxide; the aggregation of primary nuclei of aluminium (oxy)hydroxide into larger particles, and the ‘arrested growth’ of the aggregates with the formation of the three-dimensional gel network to be followed. The effect of aluminium ion molecular speciation on the sol–gel transformation stages is discussed. The data presented show that ultrasonic spectrometry, although a novel tool for sol–gel studies, is beneficial for the non-invasive monitoring of the latter stages of aluminium (oxy)hydroxide formation and its eventual breakdown in the presence of excess base. [Copyright &y& Elsevier]
Copyright of Journal of Colloid & Interface Science is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
An: 36434158
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  Data: A multi-technique study of the effect of aqueous aluminium speciation on hydrolytic gelation of aluminium (oxy)hydroxide
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  Data: <searchLink fieldCode="AR" term="%22Fournier%2C+A%2EC%2E%22">Fournier, A.C.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shafran%2C+K%2EL%2E%22">Shafran, K.L.</searchLink><br /><searchLink fieldCode="AR" term="%22Perry%2C+C%2EC%2E%22">Perry, C.C.</searchLink><i> carole.perry@ntu.ac.uk</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Colloid+%26+Interface+Science%22">Journal of Colloid & Interface Science</searchLink>. Apr2009, Vol. 332 Issue 1, p122-129. 8p.
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  Data: <searchLink fieldCode="DE" term="%22Aluminum%22">Aluminum</searchLink><br /><searchLink fieldCode="DE" term="%22Metal+ions%22">Metal ions</searchLink><br /><searchLink fieldCode="DE" term="%22Chemical+speciation%22">Chemical speciation</searchLink><br /><searchLink fieldCode="DE" term="%22Gelation%22">Gelation</searchLink><br /><searchLink fieldCode="DE" term="%22Aluminum+hydroxide%22">Aluminum hydroxide</searchLink><br /><searchLink fieldCode="DE" term="%22Buffer+solutions%22">Buffer solutions</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrolysis%22">Hydrolysis</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: Abstract: The sol–gel transformation of aqueous solutions of aluminium ions into aluminium (oxy)hydroxides induced by the addition of a ‘soft base’—‘Tris-buffer’ () has been investigated using monotonous single-batch titrations and a combination of four complimentary techniques for monitoring pH, conductivity, viscosity and ultrasound parameters (velocity and attenuation). The multi-probe monitoring of the formation of aluminium (oxy)hydroxides enabled important stages of the sol–gel transformation process including: the structural conversion of aluminium Keggin-like polynuclear clusters into nanoparticles of aluminium (oxy)hydroxide; the aggregation of primary nuclei of aluminium (oxy)hydroxide into larger particles, and the ‘arrested growth’ of the aggregates with the formation of the three-dimensional gel network to be followed. The effect of aluminium ion molecular speciation on the sol–gel transformation stages is discussed. The data presented show that ultrasonic spectrometry, although a novel tool for sol–gel studies, is beneficial for the non-invasive monitoring of the latter stages of aluminium (oxy)hydroxide formation and its eventual breakdown in the presence of excess base. [Copyright &y& Elsevier]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Journal of Colloid & Interface Science is the property of Academic Press Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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      – Type: doi
        Value: 10.1016/j.jcis.2008.12.042
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      – Code: eng
        Text: English
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      – SubjectFull: Aluminum
        Type: general
      – SubjectFull: Metal ions
        Type: general
      – SubjectFull: Chemical speciation
        Type: general
      – SubjectFull: Gelation
        Type: general
      – SubjectFull: Aluminum hydroxide
        Type: general
      – SubjectFull: Buffer solutions
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      – SubjectFull: Hydrolysis
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      – TitleFull: A multi-technique study of the effect of aqueous aluminium speciation on hydrolytic gelation of aluminium (oxy)hydroxide
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              Text: Apr2009
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