Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 30 for “"alkanethiol"”.
-
Spectroscopic and electrochemical investigation of phenyl, phenoxy, and hydroxyphenyl-terminated alkanethiol monolayers
4-(12-mercaptododecyloxy)phenol (1), 3-(12-mercaptododecyloxy)phenol (2), 4-(12-mercaptododecyl)phenol (3), 4-(12-mercapto-dodecyl)phenol (4), 12-phenyldodecyl-mercaptan (5), 12-phenylundecyoxymercaptan (6), 4-(6-mercapto-hexyl)phenol (7), and 4-(12-mercaptododecyloxy)phenol (8) were synthesized. …
-
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 …
-
Control of the self-assembly of alkanethiol-coated gold nanoparticles in the solid state
A study of the behavior of nanoparticles in the presence of solvent vapors is presented. Millimeter-scale films of gold nanoparticles, one nanometer thick, are treated with solvent vapors at various temperatures and the behavior of the nanoparticles is tracked over time using transmission electron …
-
Studies of Interfacial Phenomena: Alkanethiol Adsorption and Patterning on Gold and the Superconducting Proximity Effect in Superconductor /Semiconductor Systems
The second phenomenon studied is the superconducting proximity effect at Nb/InAs and NbN/InAs interfaces. Previous investigations of Nb/InGaAs show an excess conductance at low bias voltages when the system is superconducting. However, current models do not sufficiently explain this excess …
-
A study of mechanical forces induced by low-energy (10-100 eV) electron irradiation of alkanethiol self-assembled monolayers on Au(111)
… as for improving irradiation related techniques. Alkanethiol (AT) self-assembled monolayers (SAMs), which can spontaneously assemble on metals (i.e. Ag, Au), were selected for this research due to their uniformity and sensitivity to modification using electron beams. C-H bond rupture occurs during …
-
Size effects on self-assembly and melting of silver-alkanethiolate on inert surfaces
… materials produced in the reaction between alkanethiol and Ag are characterized and compared. It is revealed that the size of the Ag substrate has a significant role in the self-assembly process and determines the reaction products. Alkanethiol adsorbs on the surface of Ag continuous planar …
-
Investigating the molecular origins of biocompatibility : intermolecular interactions between human serum albumin and various chemically modified surfaces via high resolution force spectroscopy
… 1) gold, 2) a hydrophobic, CH3-terminated alkanethiol self-assembling monolayer (SAM), 3) a hydrophilic, COO-terminated alkanethiol SAM, and 4) individual, covalently end-grafted molecules of poly(ethylene oxide), in aqueous sodium phosphate buffer solution (PBS, ionic strength IS = 0.01M, …
-
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
… and characterization of 1- and 2-component alkanethiol monolayer gradients is investigated. Numerous surface science tools are employed to examine the distribution in coverage obtained by application of in-plane potential gradients. Macroscopic characterization was obtained by sessile water …
-
Interfacial electroactive assemblies: from molecular electronics to biological applications
… properties were turned on by co-adsorbing the alkanethiol molecules with the CD layer. The binding of [Co(biptpy)2]2+ to co-adsorbed monolayers depends on the bulk concentration of guest and was modelled by the Langmuir isotherm, yielding a free energy of adsorption, △Gads, of -29 kJ.mol−1 for …
-
Computer simulation of water near model organic surfaces : interfacial behavior and hydration forces
… of water and oligo(ethylene glycol) terminated alkanethiol SAMs. We found that hydration force is not responsible for the resistance of surfaces to protein adsorption. Hydroxyl ions are responsible for long-ranged repulsion between proteins and the surface.
-
Multidentate Alkanethiols with Cyclohexyl and Pyridyl Frameworks Forming Self-Assembled Monolayers on Gold
… densities of the alkyl chains than a normal alkanethiolate SAM (C18SH). The trends in packing density and conformational order for these SAMs decreased as follows: C18SH >> 3C13CyTSH > 3C8CyTSH > 3C3CyTSH. A preliminary study of the thermal stability of this series of SAMs by XPS measurements …
-
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
… studied. Self-assembled monolayers (SAMs) of alkanethiolates have been prepared on Ag and Au surfaces, both SHG and AC impedance measurements of the Ag-alkanethiolate-electrolyte systems have been performed for alkanethiols with different chain lengths. The capacitance of the alkanethiolate …
-
Novel Applications of Scanning Electrochemical Microscopy
… patterns with dimensions of tens of microns in n-alkanethiol passivated gold substrates. Upon completing construction of the instrumentation, SECM was applied to capillary electrophoresis to accurately and reproducibly place the electrode directly above a very small capillary opening. Feedback …
-
Development of a surface-enhanced Raman sensor for detection in complex mixtures.
… To overcome this limitation this work employs alkanethiol partition layers in combination with novel SERS platforms for the detection of environmental pollutants (eg. polychlorinated biphenyls and polycyclic aromatic hydrocarbons) and bioactive lipids. As the use of partition layers continues …
-
Ultrafast Molecular Dynamics at a Shock -Compressed Metal -Liquid Interface
… sensitive to the terminal methyl group of an alkanethiol, providing depth resolution of ∼2 A. Passage of the shock front reorients the plane of methyl groups within ∼4 ps through molecular tilts and generation of gauche conformational defects. Relaxation occurs during the subsequent …
-
Investigation of structural properties in biomolecular systems using synchrotron-based spectroscopies
… length scale. The first example are DNA-alkanethiol self-assembled monolayers, also known as DNA microarrays or DNA chips, for which a way to monitor and controllably tune the structural composition on the mesoscopic scale of many thousands of molecules was sought for. The second example …
-
Engineering Principles to Design and Analyze Patterned Neuronal Cultures Using Multielectrode Arrays
… were chemically modified with organosilane or alkanethiol based self-assembled monolayers to fabricate cell-attractive electrodes. The electrode modification did not degrade the capability of neural recording, but expected cell migration toward electrodes was not observed. The growth of …
-
In-Depth Study of Different Magnetorheological Fluid Properties Under Different Operating Parameters, and in Presence of Organic Additives
… The obtained results are used in developing n-alkanethiol surface coating and elastic SEBS bead additives to enhance MRF colloidal stability (measured using an in-built setup) and alter viscoelastic properties. respectively. Finally, MRF chain characteristics (the strength, speed, and structure …
-
A study on possible interactions between biomolecules and nanoparticles
… NPs with the disulfide-aminoacid conjugates and alkanethiol modified surfaces were evaluated by cyclic voltammetry and by electrochemical impedance spectroscopy (EIS). An apparent decline in current density observed in CV along with an electron transfer resistance increase in EIS measurements …
-
High Deviatoric Strain Engineering/
… nanocrystals in self-assembled superlattices of alkanethiol-passivated gold nanoparticles can happen at room temperature through deviatoric stress-induced displacement of the organic ligands. We find that combining a hydrostatic pressure of order several hundred megapascal and a critical …
Page 1 of 2