Analyzing the sol-gel transition of colloidal silica suspensions using time-resolved rheometry

被引：0
作者：
Noppari, Panu [1 ]
Laukkanen, Olli-Ville [2 ]
Seppala, Jukka [1 ]
机构：
[1] Aalto Univ, Sch Chem Engn, Helsinki, Finland
[2] VTT Tech Res Ctr Finland Ltd, Jyvaskyla, Finland
来源：
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS | 2025年 / 710卷
关键词：
Silica; Sol-gel; Time-resolved rheometry; Colloidal glass; Colloidal gel; PHASE-CHANGE; KINETICS; RELEASE; PRECIPITATION; MICROPARTICLES; HYDROLYSIS; EVOLUTION; RHEOLOGY; GELATION; NMR;
D O I：
10.1016/j.colsurfa.2025.136290
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The sol-gel process, which involves the hydrolysis and condensation of silica precursors, is a widely used method for preparing silica gels in a practical, well-controlled, and cost-effective way. This study aimed to explore the feasibility of using time-resolved rheometry (TRR) to examine the sol-gel transition of colloidal silica suspensions (silica sols) and analyze the effects of varying silica solid content and pH levels. The silica content ranged from 0.8 to 15 wt%, with pH values between 4.0 and 6.2. Cyclic frequency sweep (CFS) measurements were conducted to monitor changes in linear viscoelastic properties during the sol-gel transition of the silica suspensions. The results indicated that increasing the solid content of silica sols led to a linear increase in transition time, while a rise in pH resulted in an exponential decrease in transition time. The significance of this work lies in the novel TRR measurement protocol, which can accurately measure transition times from minutes to several hours and storage moduli from 100 Pa to over 100 kPa. Additionally, the study demonstrates that the resulting silica gels exhibit viscoelastic behavior characteristic of colloidal glasses rather than colloidal gels, as evidenced by the decrease in loss tangent with increasing frequency.
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页数：9
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  • [1] Singh L.P., Bhattacharyya S.K., Kumar R., Mishra G., Sharma U., Singh G., Ahalawat S., Sol-gel processing of silica nanoparticles and their applications, Adv. Colloid Interface Sci., 214, pp. 17-37, (2014)
  • [2] Ciriminna R., Fidalgo A., Pandarus V., Beland F., Ilharco L.M., Pagliaro M., The sol–gel route to advanced silica-based materials and recent applications, Chem. Rev., 113, 8, pp. 6592-6620, (2013)
  • [3] Pagliaro M., Silica-based, Materials for Advanced Chemical Applications, (2009)
  • [4] Manzano M., Vallet-Regi M., Mesoporous silica nanoparticles for drug delivery, Adv. Funct. Mater., 30, 2, (2020)
  • [5] Lei Q., Guo J., Noureddine A., Wang A., Wuttke S., Brinker C.J., Zhu W., Sol–gel-based advanced porous silica materials for biomedical applications, Adv. Funct. Mater., 30, 41, (2020)
  • [6] Brinker C.J., Scherer G.W., Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing, (2014)
  • [7] Graham T., XXXV.—on the properties of silicic acid and other analogous colloidal substances, J. Chem. Soc., 17, pp. 318-327, (1864)
  • [8] Forsback A.-P., Noppari P., Viljanen J., Mikkola J., Jokinen M., Leino L., Bjerregaard S., Borglin C., Halliday J., Sustained in-vivo release of triptorelin acetate from a biodegradable silica depot: comparison to pamorelin® LA, Nanomaterials, 11, 6, (2021)
  • [9] Tyagi P., Koskinen M., Mikkola J., Leino L., Schwarz A., Silica microparticles for sustained zero-order release of an anti-CD40L antibody, Drug Deliv. Transl. Res., 8, 2, pp. 368-374, (2018)
  • [10] Ahola M., Kortesuo P., Kangasniemi I., Kiesvaara J., Yli-Urpo A., Silica xerogel carrier material for controlled release of toremifene citrate, Int. J. Pharm., 195, 1-2, pp. 219-227, (2000)
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