The zeta potential of surface‐functionalized metallic nanorod particles in aqueous solution

Dougherty, George; Rose, Klint A.; Tok, Jeffrey B.‐H.; Pannu, Satinderpall S.; Chuang, Frank Y.S.; Sha, Michael Y.; Chakarova, Gabriela; Penn, Sharron G.

doi:10.1002/elps.200700448

Cited by 94 publications

(64 citation statements)

References 51 publications

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“…The SAM-functionalized gold surface develops a surface potential in aqueous solution. Previous reports indicate zeta-potentials ranging between À 40 and À 50 mV for gold nanoparticles coated with alcohol-terminated alkanes in an aqueous solution at a similar pH 55,56 . The SAM surface potential is weaker than that of mica.…”

Section: Discussionmentioning

confidence: 97%

Water-induced correlation between single ions imaged at the solid–liquid interface

2014

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When immersed into water, most solids develop a surface charge, which is neutralized by an accumulation of dissolved counterions at the interface. Although the density distribution of counterions perpendicular to the interface obeys well-established theories, little is known about counterions' lateral organization at the surface of the solid. Here we show, by using atomic force microscopy and computer simulations, that single hydrated metal ions can spontaneously form ordered structures at the surface of homogeneous solids in aqueous solutions. The structures are laterally stabilized only by water molecules with no need for specific interactions between the surface and the ions. The mechanism, studied here for several systems, is controlled by the hydration landscape of both the surface and the adsorbed ions. The existence of discrete ion domains could play an important role in interfacial phenomena such as charge transfer, crystal growth, nanoscale self-assembly and colloidal stability.

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Section: Discussionmentioning

confidence: 97%

Water-induced correlation between single ions imaged at the solid–liquid interface

2014

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“…According to the classical Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, colloidal stability in polar solutions is governed by two independent opposing forces: attractive van der Waals interactions and repulsive electrostatic forces. 37 The energy barrier resulting from the electrostatic repulsive forces prevents two particles from approaching each other. If this energy is overcome and particles collide, then attractive forces result in particle aggregation and destabilization of the colloidal dispersion.…”

Section: Tan Et Al Articlementioning

confidence: 99%

Formation of Pickering Emulsions Using Ion-Specific Responsive Colloids

2010

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The ability to control the dispersion, aggregation, and assembly of colloidal systems is important for a number of applications, for instance, Pickering emulsions, drug and gene delivery, control of fluid rheology, and the formation of colloidal crystal arrays. We generated a responsive colloidal system based on polymer-brush-grafted silica nanoparticles and demonstrated that such a colloidal system can be used to produce stable oil-in-water Pickering emulsions. Cationic poly(2-(methacryloyloxy)-ethyl-trimethyl-ammonium chloride) (PMETAC) brushes were grown from silica nanoparticles (diameter ∼320 nm) through surface-initiated atom-transfer radical polymerization (ATRP). PMETAC brushes are attractive coatings for controlling the behavior of colloidal systems, owing to their ion-specific collapse resulting in the switching of surface hydrophilicity. Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), transmission electron microscopy (TEM), dynamic light scattering (DLS), and zeta-potential measurements indicated the successful grafting of PMETAC brushes on nanoparticles. The resulting colloidal dispersion was shown to be responsive to perchlorate ions (ClO 4 -), which triggered particle aggregation and enabled the generation of Pickering emulsions. The onset of aggregation depended on the polymer chain length. Aggregation was not affected by the initiator density and brush conformational changes. Further studies suggested that particle aggregation and the formation of stable Pickering emulsions were not simply due to brush collapse but also were due to a gradual shielding of electrostatic repulsion. Finally, the stability and homogeneity of the resulting Pickering emulsions were studied

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“…Both EDS and XPS require ultra-high vacuum (UHV) conditions to provide uniformity of elemental composition across the top of the surface. [57] Additionally, XPS can also provide uniformity of elemental composition as a function of depth by ion beam ablation and by tilting the sample, empirical formula of pure materials, elements that contaminate a surface, and chemical or electronic state of each element in the surface. An analysis of titanium (Ti) is selected for demonstration.…”

Section: Fig 4 Schematic Demonstrates the Working Principle Of Tem mentioning

confidence: 99%

Application of Nanometals Fabricated Using Green Synthesis in Cancer Diagnosis and Therapy

Medina-Ramírez¹,

González-Garcı́a²,

Palakurthi³

et al. 2012

Green Chemistry - Environmentally Benign Approaches

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The zeta potential of surface‐functionalized metallic nanorod particles in aqueous solution

Cited by 94 publications

References 51 publications

Water-induced correlation between single ions imaged at the solid–liquid interface

Water-induced correlation between single ions imaged at the solid–liquid interface

Formation of Pickering Emulsions Using Ion-Specific Responsive Colloids

Application of Nanometals Fabricated Using Green Synthesis in Cancer Diagnosis and Therapy

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