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Showing 1 to 20 of 171 for “"Self-assembled monolayers"”.
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AFM-Assisted Nanofabrication using Self-Assembled Monolayers
… nano-particles, and proteins to patterned self-assembled monolayers. A scanning probe nanografting technique was employed to produce patterns of various sizes, down to 10 nm. Thus, we are able to demonstrate a degree of surface patterning which is an order of magnitude smaller than that …
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Self-Assembled Monolayers As Models For Silica
… and, where possible, elemental microanalysis. Self-assembled monolayers (SAMs) on gold were prepared using thiols 1, 2, and 3. SAMs were characterized using reflectance-absorbance infrared spectroscopy (RAIRS). Diagnostic vibrational modes were assigned by comparing RAIRS spectra to normal mode …
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Micro and nanoelectrochemical modification of self-assembled monolayers
Gelöste Metallionen können an fest/flüssig-Grenzflächen eine Reihe von Reaktionen eingehen. Während galvanische Abscheidungen bereits recht gründlich untersucht sind, gibt es eine ganze Reihe weiterer Reaktionen, die auf molekularem Niveau unzureichend aufgeklärt sind, obwohl sie sowohl …
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Interfacial spallation/delamination properties of self-assembled monolayers
Self-assembled monolayers (SAMs) are short (nanometer-size) organic chains terminated by functional groups that can be selected to tailor the electrical, thermal and/or mechanical properties of interfaces. In this thesis, we investigate how the presence of SAMs affects the failure properties of …
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Electrochemistry and surface chemistry of self-assembled monolayers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1999.
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Spectroelectrochemical analysis of self-assembled monolayers on gold
… prepared from long-chain organothiols have been self-assembled on gold surfaces and their chemistry and structural properties studied by physical, electrochemical and spectroscopic methods. The mechanism of charge transfer across these organic thin films was of particular interest and was studied …
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Surface analysis of self-assembled monolayers by mass spectrometry.
Surface analysis of self-assembled monolayers by mass spectrometry.
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Electrocatalytic CO2 Reduction by Self-Assembled Monolayers of Metal Porphyrins
… chemistry to azide-terminated alkyl phosphate self-assembled monolayers (SAMs) on ITO and FTO electrodes. The electrochemistry of these CO2 reduction systems is studied using cyclic voltammetry and chronoamperometry, and products are quantified through NMR and GC techniques. Additionally, AFM …
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N-heterocyclic Carbene Synthesis Towards Self-Assembled Monolayers on Gold
Modifying surfaces with self assembled monolayers (SAMs) is a simple and effective way to create functional materials. Traditionally compounds containing a thiol head group are used to generate SAMs on gold surfaces. However, a recent discovery by the Crudden lab demonstrated increased bond …
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Preparation And Characterization Of Self-Assembled Monolayers And Mesoscale Protein Patterning
<p>Bottom-up approach was used to develop self-assembled monolayers of octadecyltrichlorosilane (OTS) and undecenyltrichlorosilane(UTS) on Si(100) wafer. Undecenyltrichlorosilane monolayer was oxidized at the vinyl terminal to generate a carboxylic acid group. Lysozyme protein was immobilized on …
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Is light or ozone the active oxidant for self-assembled monolayers?
Includes bibliographical references (pages 51-54).
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Diffusion of Prodan on Self -Assembled Monolayers and Grafted Polymer Layers
Two grafted polymer layers were synthesized, for diffusion studies, with surface-initiated polymerization (SIP). The results suggest that there is very little bulk translational diffusion in first layer, poly (N-isopropylacrylamide) (PNIPAM). Rather, fluorescence recovery is thought to be due to …
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Adsorption of Xyloglucan onto Cellulose and Cellulase onto Self-assembled Monolayers
… on the adsorption of cellulase onto alkane thiol self-assembled monolayers (SAMs) on gold was also studied. Methyl (-CH3), hydroxyl (-OH) and carboxyl (-COOH) terminated SAMs were prepared. Adsorption of cellulase onto untreated and Tween 80-treated SAMs were monitored by SPR, QCM-D and AFM. The …
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Relationship between molecular structure and surface properties of self-assembled monolayers
… in microelectronic devices. In this research, self-assembled monolayers are investigated for use as an adhesion promoter for metal substrates, and for corrosion protectors of the metal surface. Gold substrates modified by adsorption of 3- and 4-aminothiophenol monolayers, 3- and …
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Development of Patterned Self-Assembled Monolayers Toward the Study of Axonal Differentiation
… a two-dimensional starburst pattern. We utilize self-assembled monolayer: SAM) chemistry in conjunction with microcontact printing to create stable patterned substrates for cell culture. Photolithography is employed in the fabrication of patterned masters, which are used to create elastomeric …
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Understanding the Structure and Properties of Self-Assembled Monolayers for Interfacial Patterning
… impact of defects on monolayer properties for self-assembled monolayers (SAMs) created by interfacial patterning methods. When forming a two-dimensional interfacial pattern with n-alkanethiols on gold, the desired electrochemical properties are those of a homogeneous, solution adsorbed …
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Investigation of structure and permeability of surfaces modified with self-assembled monolayers
… 15. The structure and the permeability of these monolayers are characterized by <i>ex situ</i> and <i>in situ</i> FTIR, contact angle measurements, and electrochemistry. It is found that the two groups of dialkyl sulfides have different surface structures and different monolayer-solution …
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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 Bacteria Viability on Surfaces Using ω-functionalized Alkanethiol Self-Assembled Monolayers
… molecules like polymers is difficult. 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 …
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Self-Assembled Monolayers of N-Heterocyclic Carbenes on Gold and Silver: Applications in Biosensing
… of metallic surfaces using thiol-based self-assembled monolayers (SAMs) has been explored in the literature in the past three decades; silver surfaces less explored than gold. This technology has promise in many surface-based applications, specifically in micro electronics, sensors that …
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