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Showing 1 to 20 of 30 for “"alkanethiols"”.
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Synthetic routes to monodisperse gold nanoparticles stabilized by different-length alkanethiols
… well-ordered nanoparticles stabilized by various alkanethiols. The first two synthesis methods were based on a two-phase system employing first tetraoctylammonium bromide (TOAB) as a phase transfer catalyst and then didodecyldimethylammonium bromide (DDAB). Though these methods approximated what …
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Multidentate Alkanethiols with Cyclohexyl and Pyridyl Frameworks Forming Self-Assembled Monolayers on Gold
Self-assembled monolayers (SAMs) generated from adsorption of the tridentate adsorbate having a cyclohexane ring as a platform were studied. The first generation of these SAMs was derived form cyclohexane-cis,cis-1,3,5-triyltrimethanethiol (CyTSH) and …
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Investigations of Structure / Property Interrelationships of Organic Thin Films Using Scanning Probe Microscopy and Nanolithography
… (SPL). Systems of organic thin films such as n-alkanethiols and pyridyl functionalized porphyrins were characterized at the molecular level, and measurements of the conductive properties of polythiophenes containing in-chain cobaltabisdicarbollides were accomplished. Understanding the …
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Heat Capacity Measurements of Two -Dimensional and Three-Dimensional Self -Assembled Monolayers Using Nanocalorimetry
… on oligo(ethylene glycol) (OEG) terminated alkanethiols and 2D SAMs on silver substrate are also presented.
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Controlling Biofouling by Surface Engineering and Molecular Inhibition
… 2 reports the synthesis of enantiomerically pure alkanethiols that terminate with different stereoisomer's of sugar alcohols, and the effect of chirality of these polyol-terminated self-assembled monolayers (SAMs) on resisting protein adsorption. <p> Chapter 3 and 4 presents the results on …
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Designing surface chemistries for in situ AFM investigations of biomolecular reactions with proteins at the nanoscale
… arrays of nanopatterns of ù-functionalized n-alkanethiols with designated terminal chemistries. After writing nanopatterns, protein binding occurs selectively on carboxylate-terminated nanopatterns via covalent bonds that are formed using N-ethyl-N'(dimethylaminoporpyl)-carbodiimide and …
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Structural Characterization of Sulfur-Based Monomolecular Thin Films: I. Langmuir-Blodgett Films Derived From Multisulfur Heterocycles. II. Second Harmonic Generation Studies of Alkanethiolates on Ag and Au
… systems have been performed for alkanethiols with different chain lengths. The capacitance of the alkanethiolate SAMs is found inversely proportional to the chain length of the alkanethiol. For both Au and Ag electrodes, the SH signal is found less sensitive to the potential …
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Dynamic in-Plane Potential Gradients for Actively Controlling Electrochemical Reactions: Part I. Characterization of 1- and 2-Component Alkanethiol Monolayer Gradients on Thin Gold Films. Part II. Applications of in-Plane Potential Gradients
… reactions other than electrosorption of alkanethiols were demonstrated with over-potential deposition of copper onto gold films. One application of these patterns is to control the movement of supermolecular objects. As a first step towards this goal, biological cells were seeded onto …
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Developing Time-Resolved Synchrotron Infrared Spectroscopy for Spectroelectrochemical Measurements
… self-assembled monolayers (SAM) of ferrocene alkanethiols. Overall, the work described in this thesis outlines the advancement of SIR-based spectroelectrochemical platforms within the group to a point, where they can be directly applied to investigation of dynamics processes within …
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Synthesis and surface modification of nanorods for investigation into organic-inorganic hybrid materials
… were carried out using gold nanorods and alkanethiols. Organic synthesis of thiol-terminated ligand groups for attachment to both gold and cadmium sulphide nanorods was performed, and such materials were used for investigations into surface modification of the synthesised nanorods. …
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Development and application electrochemical and spectrophotometric methods based upon AC potential modulation for characterization of hybrid bilayer membranes and electroactive self -assembled monolayers supported on gold electrodes
… kinetics for a redox couple attached via short alkanethiols (C5, C7, C 10) to a gold electrode. The semilog plot of standard rate constant vs. the number of methylene units remains linear down to the shortest used chain length (C5).
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Surface Functionalizations towards Nucleic Acid Purification: a nanoscale study
… plane samples functionalized with different alkanethiols and alkylsilanes SAMs will be presented as well as a quantitative and qualitative evaluation of polysome adhesion performed mainly by Atomic Force Microscopy (AFM). A proof of principle of the purification and extraction of RNA from …
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In-Plane Conductance of Thin Films as a Probe of Surface Chemical Environment: Adsorbate Effects on Film Electronic Properties of Indium Tin Oxide and Gold
… exothermic solvent mixing. The self-assembly of alkanethiols at the surface increases the conductance of ITO films, most likely through carrier population effects. In all cases examined the combined effects of surface charge, adsorbed dipole layer magnitude and carrier injection are responsible …
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Shock compression and flash-heating of molecular adsorbates on the picosecond time scale
… such as nitroaromatics, and long chain-length alkanethiols. Based on reflectance measurements of the metallic substrates, femtosecond flash-heating pulses were capable of producing large-amplitude temperature jumps with ΔT = 500 K. Laser-driven shock compression of SAMs produced pressures up to …
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Surface studies of organic thin films using scanning probe microscopy and nanofabrication
… on conductive substrates. Nanopatterned SAMs of alkanethiols and organosilanes were used successfully to direct the nanocrystals of porphyrins on the surface and characterized with contact and tapping mode imaging of AFM. Our goals were to elucidate the role of molecular structure, packing and …
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Systematic Study of Parameters Affecting Unconventional Magnetism in Gold Nanostructures
… of flat gold thin-films coated by different alkanethiols, and finally, a series of highly porous gold thin-films, which can also be coated by thiols. The first series shows that magnetism of Au NPs does relate to the thiol used to coat it, and that the effect of an electron-withdrawing …
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Investigations of Bacteria Viability on Surfaces Using ω-functionalized Alkanethiol Self-Assembled Monolayers
… Self-assembled monolayers, or SAMs, of alkanethiols on gold have been used extensively in the past 20 years as model surfaces for investigation of a large breadth of surface phenomena. SAMs allow for control of the molecular scale surface structure and are amenable to a great number of …
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Scanning Probe Study of N-Heterocyclic Carbene Self-Assembly on Coinage Metal Surfaces
… of applications. Since the inception of SAMs, alkanethiols have been the standard surface anchor. More recently, N-heterocyclic carbenes (NHCs) have gained interest due to their increased oxidative and thermal robustness relative to the thiol. Since the emergence of NHCs in surface science, …
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Applying scanning probe microscopy for the investigation of molecular self-assembly mechanisms and properties of designed nanomaterials
… controls the vertical orientation of n-alkanethiols or á,ù-alkanedithiols to exclusively generate layers with a standing-up configuration. Reactive head groups of SAMs, such as carboxyl and thiol groups, also have a role in surface self-assembly, and changes in experimental parameters of …
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