Rheological Characterization of Suspension and Gel Prepared from Colloidal Silica for Sealed Lead-Acid Batteries by Small Amplitude Dynamic Oscillation Measurement

Gelation behaviors of silica suspensions. prepared from 6 grades of commercial colloidal silica ((Ludox (R) series) and sulfuric acid. were investigated rheologically it small amplitude dynamic oscillation measurement method in which storage and loss moduli were monitored with time. To date, the gel strength of silica suspension/gel in sulfuric acid and its progress with time have not been properly defined, because of their complex rheological behavior such as their weak structure. For the purpose of a quantitative investigation. the time evolution of the storage modulus was measured for file representation or gel strength and its progress related to fluidity decline with time for application to battery manufacture. A suspension prepared front small-sized silica particles showed high gel strength and accelerated gelation. It was demonstrated that the total surface area in a unit volume of Suspension determines the gelation behavior. regardless of particle size in different grades of silica. This implies that high gel strength can be achieved with low content of silica of small particle size. It was also round that deionized colloidal silica enhances gel strength. This means that sodium ions in the Ludox (R). which play it stabilizing role, should be removed in order to form a strong gel. A positively. charged surface and chloride stabilizing ions are not suitable for gelled electrolyte, since they accelerate gelation but do not enhance gel strength. In conclusion. colloidal silica particles of small size and negative surface charge without stabilizing ions should be used for achieving high gel strength in application to batteries.
Publisher
SOC CHEMICAL ENG JAPAN
Issue Date
2008-01
Language
ENG
Keywords

VISCOELASTIC PROPERTIES; TRANSITION

Citation

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN, v.41, no.4, pp.238 - 245

ISSN
0021-9592
DOI
10.1252/jcej.04E137
URI
http://hdl.handle.net/10203/9555
Appears in Collection
CBE-Journal Papers(저널논문)
  • Hit : 198
  • Download : 1
  • Cited 0 times in thomson ci
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡClick to seewebofscience_button
⊙ Cited 1 items in WoSClick to see citing articles inrecords_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0