Effect of Gravity on Colloidal Deposition Studied by Atomic Force Microscopy

Dokou, Eleni; Barteau, Mark A.; Wagner, Norman J.; Lenhoff, Abraham M.

doi:10.1006/jcis.2001.7626

Cited by 29 publications

(20 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The remobilization and transport of the deposited clay particles found during the flushing stage suggest that indeed gravitational settling was a dominant deposition mechanism. Gravitational settling of dense particles has been reported as a significant mechanism in colloid deposition in the literature for both porous media [36,37] and fractures [13]. Transport simulations of buoyant and dense colloids through fractures support the dissimilarities between the transport behaviors of the clay particles and FluoSpheres ® observed in this work [26,27].…”

Section: Transport Of Clay Particles Vs Fluospheres ®supporting

confidence: 76%

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

Zvikelsky

Weisbrod

Dody³

2008

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

Section: Transport Of Clay Particles Vs Fluospheres ®supporting

confidence: 76%

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

Zvikelsky

Weisbrod

Dody³

2008

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

“…[1][2][3] The wet-process fabrication is especially attractive because of its low cost and mass productivity. To advance the ceramic powder assembling technology, it is required to significantly improve the control of the interaction between powder-powder, powder-solution, and powder-substrate of the current technology.…”

mentioning

confidence: 99%

Electrophoretic Deposition Mechanism of YSZ/n-Propanol Suspension

Negishi

Yamaji

Imura

et al. 2005

J. Electrochem. Soc.

View full text Add to dashboard Cite

The technological feasibility of utilizing electrophoretic deposition ͑EPD͒ has been studied. The EPD mechanism of 8 mol % yttria-stabilized zirconia ͑8YSZ͒ powder as the electrolyte material of solid oxide fuel cells ͑SOFCs͒ in n-propanol has been investigated from the viewpoint of dc and ac electrochemical experiments under applied constant voltages. A fine particle suspension can be prepared by ultrasonic vibration and is stable, and the dispersed particle becomes charged. The charged particle acts by migration of the electric charge when a dc potential is applied. The charge-transfer quantity from a particle to the deposition layer is constant with the applied EPD. The initial deposit layer, which has a high resistance, is immediately formed. This formation is accompanied by a decreasing potential gradient in the EPD bath, therefore, the deposition rate decreased. However, the bulk EPD bath characteristic itself does not change with the applied EPD. The amount of the deposit and velocity of the particles have a mutual relation and the EPD model is considered. The present investigation's objective is the technological feasibility of applying the EPD technique.In recent years, new technology to create additive properties by systematic arrangement of size-controlled fine particles in two or three dimensions has attracted great attention as a coating technology in the field of ceramic processing. 1-3 The wet-process fabrication is especially attractive because of its low cost and mass productivity. To advance the ceramic powder assembling technology, it is required to significantly improve the control of the interaction between powder-powder, powder-solution, and powder-substrate of the current technology. As for the systematic arrangement of particles on a substrate, controlling the interaction of the particleparticle and/or particle-substrate in the colloidal solution based on the simultaneous colloidal processing and added electrical field, magnetic field, gravitation field, and so on from outside has become interesting.The electrophoretic deposition ͑EPD͒ process is one of such ceramic powder assembling technologies. The EPD process is a coating technique using a simultaneous colloidal process and electrochemical driving force. 4 This process is very simple; the dispersed and charged particles in a solvent migrate to an electrode substrate under some potential gradient with a dc power source. The EPD technique has some advantages compared with the other fabrication techniques especially for decreasing the fabrication costs and structural flexibility of the substrates. 5 Therefore, the EPD technique has been gaining increasing interest as a ceramic processing technique for a variety of technical applications, e.g., electrodes, solid oxide fuel cells ͑SOFCs͒, fiberreinforced and graded ceramic composites, nanostructured materials and coatings for electronic, biomedical, optical, catalytic, and electrochemical applications. 1 For instance, experimental results using the EPD technique with several kinds of zeolit...

show abstract

“…Despite previously expressed disbelief in the possible effects of gravity on the stability of dispersions of nanoparticles, the effect was evidenced as significant and that particularly when one works with high-density nanoparticles, such as the ones composed of gold [42]. As more and more synthetic methods rely on weak chemical interactions, maintaining delicate sets of conditions for each one of them will be required, which inevitably entails the challenges of unrepeatable experimental results.…”

Section: The Problems Of Reproducibility Entailing Fine Experimental mentioning

confidence: 99%

Challenges for the Modern Science in its Descend Towards Nano Scale

Uskoković¹

2009

CNANO

View full text Add to dashboard Cite

The current rise in the interest in physical phenomena at nano spatial scale is described hereby as a natural consequence of the scientific progress in manipulation with matter with an ever higher sensitivity. The reason behind arising of the entirely new field of nanoscience is that the properties of nanostructured materials may significantly differ from their bulk counterparts and cannot be predicted by extrapolations of the size-dependent properties displayed by materials composed of microsized particles. It is also argued that although a material can comprise critical boundaries at the nano scale, this does not mean that it will inevitably exhibit properties that endow a nanomaterial. This implies that the attribute of “nanomaterial” can be used only in relation with a given property of interest. The major challenges faced with the expansion of resolution of the materials design, in terms of hardly reproducible experiments, are further discussed. It is claimed that owing to an unavoidable interference between the experimental system and its environment to which the controlling system belongs, an increased fineness of the experimental settings will lead to ever more difficulties in rendering them reproducible and controllable. Self-assembly methods in which a part of the preprogrammed scientific design is substituted with letting physical systems spontaneously evolve into attractive and functional structures is mentioned as one of the ways to overcome the problems inherent in synthetic approaches at the ultrafine scale. The fact that physical systems partly owe their properties to the interaction with their environment implies that each self-assembly process can be considered a co-assembly event.

show abstract

Effect of Gravity on Colloidal Deposition Studied by Atomic Force Microscopy

Cited by 29 publications

References 22 publications

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

A comparison of clay colloid and artificial microsphere transport in natural discrete fractures

Electrophoretic Deposition Mechanism of YSZ/n-Propanol Suspension

Challenges for the Modern Science in its Descend Towards Nano Scale

Contact Info

Product

Resources

About