PMID- 12742037
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20060314
LR  - 20190916
IS  - 0021-9797 (Print)
IS  - 0021-9797 (Linking)
VI  - 260
IP  - 1
DP  - 2003 Apr 1
TI  - In situ preparation of weakly flocculated aqueous anatase suspensions by a 
      hydrothermal technique.
PG  - 82-8
AB  - Weakly flocculated aqueous anatase suspensions were prepared in situ by 
      hydrothermally treating amorphous titania particles peptized with different 
      amounts of tetraethylammonium hydroxide (TENOH). The simultaneous formation of 
      hydrous TiO2 polyanions in the presence of OH- and tetraethylammonium cations are 
      two essential conditions for the peptization process to occur. The absence of 
      either of these conditions will cause reprecipitation. Transmission electron 
      microscopy (TEM) revealed that the morphology of the particles formed at low 
      TENOH concentrations consisted of well-dispersed anatase crystals, changing to 
      asterisk-like structured particles with increasing concentrations of TENOH. 
      Because of the extremely high absolute zeta potential (over -70 mV in all the 
      samples) and ionic strength values, nontouching particle networks may be formed 
      in situ in the mother solution in all samples, as predicted by DLVO theory. A 
      trend to coagulation was observed in the suspensions with increasing 
      concentrations of TENOH due to a more pronounced secondary minimum in the 
      particle pair potential curves. Assuming the particles remained in the secondary 
      minimum throughout the hydrothermal treatment may lead to the formation of the 
      asterisk-like hard agglomerates. This may arise from the condensation of the 
      -OH-rich TiO2 particles or from the deposition of material in the interparticle 
      gap during the particle growth process. The green packing density of slip-cast 
      bodies from a suspension containing 20 wt% solids was around 46%.
FAU - Yang, Juan
AU  - Yang J
AD  - Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 
      3810-193 Aveiro, Portugal. yangjuan@cv.ua.pt
FAU - Mei, Sen
AU  - Mei S
FAU - Ferreira, Jose M F
AU  - Ferreira JM
LA  - eng
PT  - Journal Article
PL  - United States
TA  - J Colloid Interface Sci
JT  - Journal of colloid and interface science
JID - 0043125
EDAT- 2003/05/14 05:00
MHDA- 2003/05/14 05:01
CRDT- 2003/05/14 05:00
PHST- 2003/05/14 05:00 [pubmed]
PHST- 2003/05/14 05:01 [medline]
PHST- 2003/05/14 05:00 [entrez]
AID - S002197970200190X [pii]
AID - 10.1016/s0021-9797(02)00190-x [doi]
PST - ppublish
SO  - J Colloid Interface Sci. 2003 Apr 1;260(1):82-8. doi: 
      10.1016/s0021-9797(02)00190-x.