Self-Assembled Monolayers on Electroless Gold Impart pH-Responsive Transport of Ions in Porous Membranes

Hou, Zhizhong; Abbott, and Nicholas L.; Stroeve, Pieter

doi:10.1021/la991045k

Cited by 94 publications

(140 citation statements)

References 31 publications

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“…The membrane was sandwiched between two half U-shaped cells, as described previously [25], which will be referred to as the reservoir and sink. The reservoir contained 50 ml of 100 µg ml −1 of ovalbumin in PBS at pH 7.2.…”

mentioning

confidence: 99%

Transport and functional behaviour of poly(ethylene glycol)-modified nanoporous alumina membranes

Lee

Shang

Haasch³

et al. 2005

Nanotechnology

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The development of hybrid organic–inorganic membranes with a low propensity for protein adsorption and highly uniform nanometre size pores is described. Poly(ethylene glycol) (PEG) monolayers were grafted to nanoporous alumina membranes using covalent silane and physical adsorption poly(ethyleneimine) (PEI) immobilization chemistries. X-ray photoelectron spectroscopy (XPS) and electron microscopy were used to investigate the chemical and physical surface properties of the membranes. The adsorption behaviour of a serum albumin on the membranes was characterized with fluorescence spectroscopy and it was determined that the PEG coating reduced nonspecific protein adsorption to a level too small to be measured. The gas and liquid permeabilities of membranes were measured to determine if the surface chemistries changed the functional behaviour of the membranes. Surprisingly, the silane chemistry produced little change in the permeabilities while polymer adsorption resulted in a total loss of water permeability. The diffusion of ovalbumin through the membranes was also measured and compared with a theoretical value. Diffusion of ovalbumin through the silane-PEG-modified membranes was found to be 50% slower than the unmodified membranes, which suggests that the pores are coated with a dense film of PEG. These results suggest that hybrid organic–inorganic membranes can provide significantly improved functional behaviour over existing organic or inorganic membranes.

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mentioning

confidence: 99%

Transport and functional behaviour of poly(ethylene glycol)-modified nanoporous alumina membranes

Lee

Shang

Haasch³

et al. 2005

Nanotechnology

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“…For example, gold deposition on the membrane surface followed by attachment of self-assembled monolayers (SAM) has been shown to dramatically improve the membrane selectivity by promoting the control over the electrostatic interactions. [49][50][51] Applying electric potentials directly to membranes is another approach that has been demonstrated to improve the transport rate and selectivity by allowing an external control over the charges. [52][53][54] Moreover, silicon and silicon nitride surfaces can be functionalized directly by covalently attaching organic monolayers using various methods including heating, UV irradiation, and Grignard reactions.…”

Section: Membrane Performancementioning

confidence: 99%

Fabrication of functional silicon-based nanoporous membranes

Ileri

Stroeve

Palazoğlu

et al. 2012

J. Micro/Nanolith. MEMS MOEMS

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Abstract. Macroscopic porous membranes with pore diameter uniformity approaching the nanometer scale have great potential to significantly increase the speed, selectivity, and efficiency of molecular separations. We present fabrication, characterization, and molecular transport evaluation of nanoporous thin silicon-based sieves created by laser interferometric lithography (LIL). This fabrication approach is ideally suited for the integration of nanostructured pore arrays into larger microfluidic processing systems, using a simple all-silicon lithographic process. Submillimeter-scale planar arrays of uniform cylindrical and pyramidal nanopores are created in silicon nitride and silicon, respectively, with average pore diameters below 250 nm and significantly smaller standard error than commercial polycarbonate track etched (PCTE) membranes. Molecular transport properties of short cylindrical pores fabricated by LIL are compared to those of thicker commercial PCTE membranes for the first time. A 10-fold increase in pyridine pore flux is achieved with thin membranes relative to commercial sieves, without any modification of the membrane surface.

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“…This suggested that these membranes might be useful as molecular sieves. [3][4][5][6] Studies show that this type of Au nanotubules enjoys permeation selectivity based on the difference of the size of molecules or ions and the electric charge of ions. [3][4][5][6][7][8][9] In general, the bigger the radius of the substances through the nanotubules was, the slower the transport rate that was observed.…”

Section: Introductionmentioning

confidence: 99%

“…10 Modification of different chemical groups within interior walls of nanotubules facilitates formation of specific transport environments and introduces chemical transport selectivity into these nanotubules. 3,11,12 To modify gold nanotubules with thiol compounds with different chain length may help separation of polar and non-polar molecules. 4 The nanotubules modified with non-polar alkyl chains onto gold via thiol group or by the adsorption process may transport selectively non-polar hydrophobic molecules (e.g.…”

Section: Introductionmentioning

confidence: 99%

Transport and Separation of Small Organic Molecules through Nanotubules

Huang

Yin

2006

ANAL. SCI.

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An electroless plating method was applied to deposit Au onto the surfaces and the walls of pores of polycarbonate membranes to prepare gold nanotubules. The nanotubules were modified with cysteine (Cys) or with carbamidine thiocyante (Gua). The effects of modifiers and of the fine structure of organic molecules on the transport properties of those molecules through the gold nanotubules were investigated. Studies show that the hydrophilicity of modifiers and the planar structure of permeating molecules clearly affect the transport of small organic molecules in gold nanotubules. Tryptophan (Try) and vitamin B2 (VB2) was cleanly separated at pH 6.8.

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Self-Assembled Monolayers on Electroless Gold Impart pH-Responsive Transport of Ions in Porous Membranes

Cited by 94 publications

References 31 publications

Transport and functional behaviour of poly(ethylene glycol)-modified nanoporous alumina membranes

Transport and functional behaviour of poly(ethylene glycol)-modified nanoporous alumina membranes

Fabrication of functional silicon-based nanoporous membranes

Transport and Separation of Small Organic Molecules through Nanotubules

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