Direct visualization of colloidal gelation under confinement
Sarangapani, Prasad S.1; Yu, Yanghai1; Zhao, Jiang2; Zhu, Yingxi1
Source PublicationPHYSICAL REVIEW E
AbstractThe physical mechanism of colloidal gelation remains inadequately understood, particularly for intermediate to high volume fractions. Experiments to directly probe the complex evolution of structural and viscoelastic properties of gels have been few despite their fundamental importance in elucidating the physical mechanisms responsible for gelation. In this study, we use a home-built micron-gap rheometer combined with confocal microscopy to directly investigate the coupled structural and dynamic properties of colloidal gelation transition by spatial confinement. We observe that confinement-induced gelation proceeds by a spinodal decomposition route where strongly confined colloidal suspensions evolve into "colloid-rich" and "colloid-poor" regions; the propagation of the "colloid-rich" region in three dimensions is responsible for structural arrest and strong viscoelastic enhancement when a critical film thickness approaches 16-25 particle layers.
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WOS IDWOS:000257287500065
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Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Corresponding AuthorSarangapani, Prasad S.
Affiliation1.Univ Notre Dame, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA
2.Chinese Acad Sci, Inst Chem, Beijing, 100080, Peoples R China
Recommended Citation
GB/T 7714
Sarangapani, Prasad S.,Yu, Yanghai,Zhao, Jiang,et al. Direct visualization of colloidal gelation under confinement[J]. PHYSICAL REVIEW E,2008,77(6).
APA Sarangapani, Prasad S.,Yu, Yanghai,Zhao, Jiang,&Zhu, Yingxi.(2008).Direct visualization of colloidal gelation under confinement.PHYSICAL REVIEW E,77(6).
MLA Sarangapani, Prasad S.,et al."Direct visualization of colloidal gelation under confinement".PHYSICAL REVIEW E 77.6(2008).
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