Modification of silicon oxide surfaces by monolayers of an oligoethylene glycol-terminated perfluoroalkyl silane

Meiners, Frank; Ross, Jan H.; Brand, Izabella; Buling, Anna; Neumann, M.; Köster, Philipp Julian; Christoffers, Jens; Wittstock, Günther

doi:10.1016/j.colsurfa.2014.02.015

Cited by 15 publications

(14 citation statements)

References 59 publications

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“…Hexa(ethylene glycol) monomethyl ether tosylate (HxgOTs) was synthesized according to a literature procedure. 72 The contents were mixed thoroughly by inversion, quickly inserted into the spectrometer, and acquisition started, collecting 1 scan per data point with a delay of 5.00 s and an acquisition time of 2.1825 s.…”

Section: Experimental Section Generalmentioning

confidence: 99%

Structure–property Effects in the Generation of Transient Aqueous Benzoic Acid Anhydrides by Carbodiimide Fuels

Kariyawasam¹,

Kron²,

Jiang³

et al. 2019

Preprint

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<div>The design of dissipative systems, which operate out-of-equilibrium by consuming chemical fuels, is challenging. As yet, there are few examples of privileged fuel chemistries that can be broadly applied in abiotic systems in the same way that ATP hydrolysis is exploited throughout biochemistry. The key issue is that designing nonequilibrium systems is inherently about balancing the relative rates of coupled reactions. The use of carbodiimides as fuels to generate transient aqueous carboxylic anhydrides has recently been used in examples of new nonequilibrium materials and supramolecular assemblies. Here, we explore the kinetics of formation and decomposition of a series of benzoic anhydrides generated from the corresponding acids and EDC under typical conditions (EDC = <i>N</i>-(3-dimethylaminopropyl)-<i>N</i>′-ethylcarbodiimide hydrochloride). The reactions can be described by a simple mechanism that merges known behavior for the two processes independently. Structure–property effects in these systems are dominated by differences in anhydride decomposition rate. The kinetic parameters allow trends in concentration-dependent properties to be simulated, such as reaction lifetimes, peak anhydride concentrations, and yields. For key properties there are diminishing returns with the addition of increasing amounts of fuel. These results should provide useful guidelines for the design of functional systems making use of this chemistry. <br></div>

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Section: Experimental Section Generalmentioning

confidence: 99%

Structure–property Effects in the Generation of Transient Aqueous Benzoic Acid Anhydrides by Carbodiimide Fuels

Kariyawasam¹,

Kron²,

Jiang³

et al. 2019

Preprint

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“…A key, but often overlooked requirement towards supported biomimetic membranes is to accommodate the cytoplasmic as well as extracellular domains of the proteins, that is, the need for an aqueous reservoir between the support surface and the bilayer membrane. 30,31 To this end, a variety of spacers has been suggested to suspend the membranes on the support surface, such as polymer cushions, 32 polar peptides, 33,34 self assembled monolayer of oligoethylene glycol thiolates 35 as well as inert proteins. 36,37 These spacers provide an irregular support, and the quality and morphology of bilayers formed on them is hard to characterize.…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic changes measured in partially suspended single bilayer membranes

Hasan

Mechler

2015

Soft Matter

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For studies involving biomimetic phospholipid membrane systems, such as membrane-protein interactions, it is crucial that the supported membrane is biomimetic in its physical properties as well as in its composition. Two often overlooked aspects of biomimicry are the need for unrestrained lipid mobility, reflected in the viscoelastic properties of the membrane, and sufficient space between the membrane and the support for the insertion of transmembrane proteins. Here we show for a series of DMPC-based membranes that a partially suspended single bilayer membrane can be formed on functionalized gold surface without tethering. These membranes exhibit sufficient freedom of motion to represent the viscoelastic properties of a free lamellar bilayer membrane as demonstrated by determining the phase transition temperatures of these single bilayer membranes from the viscosity change upon chain melting using the dissipation signal of a quartz crystal microbalance (QCM-D). Atomic force microscopy imaging confirmed confluent, smooth membrane coverage of the QCM-D sensor that completely obscured the roughness of the sputtered gold surface. High-force AFM imaging was able to push membrane patches into the valleys of the gold morphology, confirming the inherently suspended nature of the MPA supported membrane. We show that the correlation between frequency and dissipation changes in the QCM-D sensograms is a sensitive indicator of the morphology of the membrane.

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“…Interestingly, we can also explore how an OEG‐SAM on an insulating substrate would respond to the etching pulse (Figure S11). Such layers can be formed by OEG‐terminated trichlorosilanes on glass and other oxidic surfaces [38] . The etching process may be conducted in the same way as for SAMs on Au.…”

Section: Resultsmentioning

confidence: 99%

“…Such layers can be formed by OEG-terminated trichlorosilanes on glass and other oxidic surfaces. [38] The etching process may be conducted in the same way as for SAMs on Au. However, SECM FB images of modified insulating substrates do not allow the determination of r S because the mediator used in the imaging experiment cannot be recycled at the exposed insulating substrate from which the SAM was etched away.…”

Section: Etching Of Sams On Insulating Substratesmentioning

confidence: 99%

Modification and Patterning of Self‐Assembled Monolayers Using Electrogenerated Etchants and Homogeneous Scavenging Reactions in a Scanning Electrochemical Microscope

et al. 2021

Self Cite

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Self‐assembled monolayers (SAMs) of oligoethylene glycol (OEG)‐terminated alkanethiolates on gold, which are used to control protein adsorption and cell adhesion, were patterned by reaction with Br2/HOBr electrogenerated at a microelectrode of a scanning electrochemical microscope (SECM). The spreading of the Br2 diffusion layers was limited by a homogeneous reaction with cystamine or L‐cystine as scavengers. The influence of process parameters on the patterning process was explored by simulation and combinatorial experiments. The experimental determination of pattern sizes from SECM feedback images was verified by scanning force microscopy. The simulation considered the local Br2 formation as well as Br2 consumption in the reaction with the OEG SAM, by reduction at the gold substrate, and by the homogeneous scavenging reaction. It used experimentally determined diffusion coefficients and rate constants of the scavenging reaction. and Experiments and simulation confirmed the existence of regions in the parameter space, in which the patterning process is robust against small variation of the parameters working distance, pulse time and scavenger excess.

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Modification of silicon oxide surfaces by monolayers of an oligoethylene glycol-terminated perfluoroalkyl silane

Cited by 15 publications

References 59 publications

Structure–property Effects in the Generation of Transient Aqueous Benzoic Acid Anhydrides by Carbodiimide Fuels

Structure–property Effects in the Generation of Transient Aqueous Benzoic Acid Anhydrides by Carbodiimide Fuels

Viscoelastic changes measured in partially suspended single bilayer membranes

Modification and Patterning of Self‐Assembled Monolayers Using Electrogenerated Etchants and Homogeneous Scavenging Reactions in a Scanning Electrochemical Microscope

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