Direct Visualization of the Hydration Layer on Alumina Nanoparticles with the Fluid Cell STEM in situ

2015-05-21
FIRLAR, Emre
Çınar, Simge
KASHYAP, Sanjay
AKINC, MÜFİT
PROZOROV, Tanya
Rheological behavior of aqueous suspensions containing nanometer-sized powders is of relevance to many branches of industry. Unusually high viscosities observed for suspensions of nanoparticles compared to those of micron size powders cannot be explained by current viscosity models. Formation of so-called hydration layer on alumina nanoparticles in water was hypothesized, but never observed experimentally. We report here on the direct visualization of aqueous suspensions of alumina with the fluid cell in situ. We observe the hydration layer formed over the particle aggregates and show that such hydrated aggregates constitute new particle assemblies and affect the flow behavior of the suspensions. We discuss how these hydrated nanoclusters alter the effective solid content and the viscosity of nanostructured suspensions. Our findings elucidate the source of high viscosity observed for nanoparticle suspensions and are of direct relevance to many industrial sectors including materials, food, cosmetics, pharmaceutical among others employing colloidal slurries with nanometer-scale particles.
SCIENTIFIC REPORTS

Suggestions

Mechanical Fracturing of Core-Shell Undercooled Metal Particles for Heat-Free Soldering
Çınar, Simge; Chen, Jiahao; Thuo, Martin (Springer Science and Business Media LLC, 2016-02-23)
Phase-change materials, such as meta-stable undercooled (supercooled) liquids, have been widely recognized as a suitable route for complex fabrication and engineering. Despite comprehensive studies on the undercooling phenomenon, little progress has been made in the use of undercooled metals, primarily due to low yields and poor stability. This paper reports the use of an extension of droplet emulsion technique (SLICE) to produce undercooled core-shell particles of structure; metal/oxide shell-acetate ('/'=...
Optical and mechanical properties of fiber-reinforced ceramic matrix optically transparent composites
Dericioğlu, Arcan Fehmi (2001-12-01)
The idea of increasing the fracture resistance of optically transparent Ceramics by incorporation of continuous fibers with a small expense in their light transmission was applied to a SiC (SCS-6) fiber-reinforced magnesium aluminate spinel matrix composite. It was found that although there is a slight decrease in the light transmittance of the transparent monolithic matrix with increasing fiber volume fraction, a fail-safe mechanism appeared in the composite by the bridging effect of the intact fibers
Novel topological nodal lines and exotic drum-head-like surface states in synthesized CsCl-type binary alloy TiOs
Wang, Xiaotian; Ding, Guangqian; Cheng, Zhenxiang; Surucu, Gokhan; Wang, Xiao-Lin; Yang, Tie (Elsevier BV, 2020-03-01)
Very recently, searching for new topological nodal line semimetals (TNLSs) and drum-head-like (DHL) surface states has become a hot topic in the field of physical chemistry of materials. Via first principles, in this study, a synthesized CsCl type binary alloy, TiOs, was predicted to be a TNLS with three topological nodal lines (TNLs) centered at the X point in the k(x/y/z) = pi plane, and these TNLs, which are protected by mirror, time reversal (T) and spatial inversion (P) symmetries, are perpendicular to...
Actin stabilizing compounds show specific biological effects due to their binding mode
Wang, Shuaijun; Crevenna, Alvaro H.; Ugur, Ilke; Marıon, Antoıne; Antes, Iris; Kazmaier, Uli; Hoyer, Maria; Lamb, Don C.; Gegenfurtner, Florian; Kliesmetes, Zane; Ziegenhain, Christoph; Enard, Wolfgang; Vollmar, Angelika; Zahler, Stefan (Springer Science and Business Media LLC, 2019-07-05)
Actin binding compounds are widely used tools in cell biology. We compare the biological and biochemical effects of miuraenamide A and jasplakinolide, a structurally related prototypic actin stabilizer. Though both compounds have similar effects on cytoskeletal morphology and proliferation, they affect migration and transcription in a distinctive manner, as shown by a transcriptome approach in endothelial cells. In vitro, miuraenamide A acts as an actin nucleating, F-actin polymerizing and stabilizing compo...
Nanoparticle self-assembly at the interface of liquid crystal droplets
Rahimi, Mohammad; Roberts, Tyler F; Armas-Pérez, Julio C; Wang, Xiaoguang; Büküşoğlu, Emre; Abbott, Nicholas L; de Pablo, Juan Jose (Proceedings of the National Academy of Sciences, 2015-04-28)
Nanoparticles adsorbed at the interface of nematic liquid crystals are known to form ordered structures whose morphology depends on the orientation of the underlying nematic field. The origin of such structures is believed to result from an interplay between the liquid crystal orientation at the particles' surface, the orientation at the liquid crystal's air interface, and the bulk elasticity of the underlying liquid crystal. In this work, we consider nanoparticle assembly at the interface of nematic drople...
Citation Formats
E. FIRLAR, S. Çınar, S. KASHYAP, M. AKINC, and T. PROZOROV, “Direct Visualization of the Hydration Layer on Alumina Nanoparticles with the Fluid Cell STEM in situ,” SCIENTIFIC REPORTS, pp. 0–0, 2015, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/35411.