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Structure Stability And Electron Transfer Characteristics Of Self Assembled Monolayers Containing Internal Peptide Groups
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Book Synopsis Structure, Stability and Electron Transfer Characteristics of Self-assembled Monolayers Containing Internal Peptide Groups by : Robert Samuel Clegg
Download or read book Structure, Stability and Electron Transfer Characteristics of Self-assembled Monolayers Containing Internal Peptide Groups written by Robert Samuel Clegg and published by . This book was released on 1999 with total page 700 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Stability of and Electron Transfer Through Self-assembled Monolayers of Conformationally Constrained Peptides by :
Download or read book Stability of and Electron Transfer Through Self-assembled Monolayers of Conformationally Constrained Peptides written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Handbook of Nanoelectrochemistry by : Mahmood Aliofkhazraei
Download or read book Handbook of Nanoelectrochemistry written by Mahmood Aliofkhazraei and published by Springer. This book was released on 2015-11-03 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited book is devoted to different electrochemical aspects of nano materials. This comprehensive reference text is basically divided in 3 parts: electrochemical synthesis routes for nanosized materials, electrochemical properties of nano materials and electrochemical characterization methods for nanostructures. The Handbook is a reference work to chemists and materials scientists interested in the nano aspects of electrochemistry. The chapters are written by a number of international experts in the field and the content will assist members of both electrochemical and materials communities to keep abreast of developments in the field.
Download or read book Chemical Abstracts written by and published by . This book was released on 2002 with total page 2540 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mixed Valency and Electronic Structure in Self-assembled Monolayers, Self-exchange, and Hydrogen Bonded Assemblies by : John Christopher Goeltz
Download or read book Mixed Valency and Electronic Structure in Self-assembled Monolayers, Self-exchange, and Hydrogen Bonded Assemblies written by John Christopher Goeltz and published by . This book was released on 2011 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mixed valency and electron transfer are explored in self-assembled monolayers, in intermolecular electron self-exchange reactions in solution, and in hydrogen bonded assemblies. Tetrathiafulvalene is derivatized for binding to gold in self-assembled monolayers, but the trinuclear ruthenium cluster Ru3O(OAc)6L3 (where L is an ancillary ligand) is used as a building block for the majority of the work. While oxo-centered trinuclear hexaacetate clusters of many transition metals are known, the triruthenium cluster is particularly versatile because of the kinetically stable binding of a wide variety of ligands. The electronic structure can be depicted by molecular orbitals diagrams or more recently by computer generated combinations of atomic orbitals, and remains relatively unchanged for variously substituted clusters. The important differences with respect to getting an electron in or out of a cluster lie in electron delocalization onto ligand based orbitals. In combination with reorganization energies calculated from accumulated structural and vibrational data, the molecular orbital diagrams offer a great deal of explanatory power. When allowed by symmetry and energy matching, electrons in reduced clusters are delocalized onto pyridine [pi]* orbitals, greatly easing the transfer to an oxidized cluster in the face of a large reorganization energy. When electron delocalization is not allowed, electron self-exchange can be fast only if the reorganization energy is small. In hydrogen bonded assemblies of these ruthenium clusters, the electronic structure is still dominant in electron transfer behavior. In these cases the increase in delocalization upon dimerization appears to induce large changes in the orbital energies. This is consistent with the electronic absorptions and the thermal electron transfer behavior observed. The take-home message of this dissertation is that one must understand to electronic structure of a complex in order to understand its behavior in electron transfer reactions. This may seem obvious, but is often overlooked. With the knowledge of the electronic structure of reactants and products, one has a much greater chance of understanding the path between them. Molecular orbital diagrams seem cumbersome and outdated in this age of calculated chemistry, but many cases drawing them out is worth the investment in time. Who knows, you may even learn something.
Book Synopsis American Doctoral Dissertations by :
Download or read book American Doctoral Dissertations written by and published by . This book was released on 2002 with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Electron Transfer Mediating Properties of Self-assembled Monolayers by : Jian Liang
Download or read book Electron Transfer Mediating Properties of Self-assembled Monolayers written by Jian Liang and published by . This book was released on 2008 with total page 308 pages. Available in PDF, EPUB and Kindle. Book excerpt: Molecular electronics have been attracting tremendous interest in recent years. One of the basic questions remaining unanswered, however, in this field is how to determine the "conductivity" of molecules. Conventional methods for measuring electron transport properties through metal-molecule-metal junctions lack the precise descriptions of the contact properties in the junction. Consequently, the "conductivities" of molecules reported in the literature are not consistent. In this dissertation we report a new experimental method for measuring relatively small differences in electron tunneling through two distinct monolayers. We place them side by side using scanning probe nanolithography and compare the tunneling currents by conductive probe atomic force microscopy under identical force, voltage, and tip contamination conditions. We demonstrate the validity of our approach by applying it to two isomeric molecules with similar length and functional groups, with only the position of two functional groups, one aromatic and the other aliphatic, being inverted with respect to each other. The relative values of the two tunneling currents, calculated using density functional theory in the Tersoff-Hamann approach, compare very well with the experimental data, providing us with an example of theory vs experiment agreement that is rather uncommon in this field.
Book Synopsis Use of Self-assembled Monolayers to Tailor Surface Properties by : Natalie A. LaFranzo
Download or read book Use of Self-assembled Monolayers to Tailor Surface Properties written by Natalie A. LaFranzo and published by . This book was released on 2013 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subsequent work describes advances in modifying the chemical properties of various substrates to tailor the surface properties for specific applications. This is achieved by making use of a molecular assembly known as self-assembled monolayers, or SAMs. SAMs are composed of tightly packed organic molecules that form a well-ordered structure on a substrate. Typically, the head group of the monomer is covalently anchored to the substrate, and monolayer order and self-assembly is achieved through van der Waals interactions between the long alkyl chains of the monomer's tail group. Monolayers containing head groups consisting of thiols, siloxanes, and phosphonates have been demonstrated on gold, glass, and metal oxides, respectively. We have expanded upon existing monolayer technology and designed monolayers with either new head group or new tail group functionalities. The resulting surfaces have been characterized by a variety of techniques including infrared spectroscopy, contact angle analysis, quartz crystal microbalance analysis, surface plasmon resonance imaging, and atomic force microscopy. We have also explored applications for these functionalized surfaces in areas ranging from microelectromechanical systems (MEMS) lubrication to platforms for studying neuronal development in vitro. In the area of MEMS lubrication, the development of new surface coatings is critical for combating wear and increasing the device lifetime. We reported a class of arsonic acid SAMs that form readily on oxide substrates including silicon oxide, borosilicate glass, and titanium oxide. The monolayers are easily prepared using a straightforward soaking technique, which is amenable to large-scale commercial applications. We have characterized monolayer formation on borosilicate glass and titanium oxide using infrared spectroscopy. Monolayers on borosilicate glass, native silicon oxide and titanium oxide were also evaluated with contact angle measurements, and as wear measurements using nanoscratching experiments. On titanium oxide and borosilicate glass, monolayers prepared from hexadecylarsonic acid provide significantly greater surface protection than surfaces reacted under similar conditions with hexadecylphosphonic acid, a common modifying agent for oxide substrates. To develop a platform for in vitro studies of neuronal development, we have utilized mixed-monolayers incorporating low densities of cell-adhesive peptides. The monomers feature a tetraethylene glycol moiety in the tail group to prevent the non-specific adsorption of proteins, and a low density of monomers were terminated with an azide moiety to specifically attach a laminin-derived peptide (IKVAV) terminated with an alkyne group via the copper-mediated azide-alkyne cycloaddition (CuAAC) reaction. To achieve this, a pentynoic acid molecule was appended to the N-terminus of the peptide during solid phase synthesis. Surfaces containing 0.01% and 0.1% azide-coupled peptide were determined to be resistant to the non-specific adsorption of proteins. Hippocampal neurons dissected from embryonic mice were cultured on these surfaces and the effects of the peptides on neurite outgrowth were observed. Similar neurite numbers per cell were observed on both substrates, but longer neurites were measured on the 0.1% azide-coupled peptide substrate. Unfortunately, further studies revealed that aldehyde fixation methods for immunohistochemistry did not successfully attach neuronal cells to the surface due to limited attachment points on the surface. Many developmental cell biology experiments require downstream immunohistochemical analysis. As such, to overcome this limitation and to simplify the surface preparation, a protein-resistant intermolecular zwitterionic monolayer, which supports cell fixation, was utilized. We have shown that the intermolecular zwitterionic monolayer has well-defined, non-receptor mediated cellular attachment provided by cell-surface sugar interactions. Exploiting these properties, we have developed a monolayer stripe assay, where the interactions between neurons (cell bodies and neurites) and extracellular matrix (ECM) proteins or guidance cues can be observed and quantified. This system goes beyond current technologies and is capable of evaluating neuronal response to the extracellular matrix protein, laminin, which has previously been considered a control molecule in neuronal stripe assays. Taken together, this work highlights advancements in the field of self-assembled monolayer chemistry with practical applications. In particular, we have focused on the functionalization of glass and oxides surfaces for applications in device lubrication. As well, we have developed two alkanethiol self-assembled monolayer approaches for generating surfaces that are both protein resistant and cell permissive, advancing the tools available for studying neuronal development in vitro.
Book Synopsis The Electronic Structure of Biomolecular Self-Assembled Monolayers by : Matthaeus Anton Wolak
Download or read book The Electronic Structure of Biomolecular Self-Assembled Monolayers written by Matthaeus Anton Wolak and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The studies presented here address the characterization of the electronic structure of various self-assembled monolayers (SAMs) of peptide nucleic acid (PNA) and tetraphenylporphyrin (TPP) SAMs and arrays, formed on gold substrates. PNA is a promising alternative to DNA for bio-sensing applications, as well as for strategies for self-assembly based on nucleic acid hybridization. In recent years charge transfer through PNA molecules was a focus of research due to possible applications in self-assembled molecular circuits and molecular tools. In light of this research it is interesting to investigate the electronic structure of PNA interfaces to gold, a potential electrode material. TPP is, due to its electronic structure, an organic p-type molecular semiconductor. Such a material can provide an alternative to standard micro- and optoelectronic devices and in recent years more attention was paid to semiconducting polymers and organic compounds offering these low-cost and flexible alternatives. Therefore, it is of high importance to investigate the prospect of using modified TPP molecules for the formation of interconnected molecular networks on metallic surfaces. All investigated monolayers were formed from solution in a nitrogen atmosphere inside a homemade glove box. This process allowed for PNA SAM and TPP SAM and array formation on clean Au substrates without the exposure to the ambient atmosphere. Ultraviolet and X-ray photoemission spectroscopy (UPS and XPS) measurements on the resulting PNA SAMs and TPP SAMs and arrays, which were performed in a to the glove box attached vacuum chamber containing a photoemission spectrometer, revealed the hole injection barriers at the interfaces and the interface dipoles. In addition to the UPS and XPS measurements on PNA, electronic structure calculations based on molecular dynamics sampling of the PNA structure were obtained, yielding the HOMO-LUMO gap and the electronic density of states for PNA.
Book Synopsis Materials Nanoarchitectonics by : Katsuhiko Ariga
Download or read book Materials Nanoarchitectonics written by Katsuhiko Ariga and published by Elsevier. This book was released on 2023-12-07 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Materials Nanoarchitectonics: From Integrated Molecular Systems to Advanced Devices provides the latest information on the design and molecular manipulation of self-organized hierarchically structured systems using tailor-made nanoscale materials as structural and functional units. The book is organized into three main sections that focus on molecular design of building blocks and hybrid materials, formation of nanostructures, and applications and devices. Bringing together emerging materials, synthetic aspects, nanostructure strategies, and applications, the book aims to support further progress, by offering different perspectives and a strong interdisciplinary approach to this rapidly growing area of innovation. This is an extremely valuable resource for researchers, advanced students, and scientists in industry, with an interest in nanoarchitectonics, nanostructures, and nanomaterials, or across the areas of nanotechnology, chemistry, surface science, polymer science, electrical engineering, physics, chemical engineering, and materials science. - Offers a nanoarchitectonic perspective on emerging fields, such as metal-organic frameworks, porous polymer materials, or biomimetic nanostructures - Discusses different approaches to utilizing "soft chemistry" as a source for hierarchically organized materials - Offers an interdisciplinary approach to the design and construction of integrated chemical nano systems - Discusses novel approaches towards the creation of complex multiscale architectures
Book Synopsis Molecular Films, the Cyclotron and the New Biology by :
Download or read book Molecular Films, the Cyclotron and the New Biology written by and published by . This book was released on 1942 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Nanoscale Assembly by : Wilhelm T.S. Huck
Download or read book Nanoscale Assembly written by Wilhelm T.S. Huck and published by Springer Science & Business Media. This book was released on 2006-07-11 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nanotechnology has received tremendous interest over the last decade, not only from the scientific community but also from a business perspective and from the general public. Although nanotechnology is still at the largely unexplored frontier of science, it has the potential for extremely exciting technological innovations that will have an enormous impact on areas as diverse as information technology, medicine, energy supply and probably many others. The miniturization of devices and structures will impact the speed of devices and information storage capacity. More importantly, though, nanotechnology should lead to completely new functional devices as nanostructures have fundamentally different physical properties that are governed by quantum effects. When nanometer sized features are fabricated in materials that are currently used in electronic, magnetic, and optical applications, quantum behavior will lead to a set of unprecedented properties. The interactions of nanostructures with biological materials are largely unexplored. Future work in this direction should yield enabling technologies that allows the study and direct manipulation of biological processes at the (sub) cellular level.
Book Synopsis Experimental Relations of Gold (and Other Metals) to Light by : Michael Faraday
Download or read book Experimental Relations of Gold (and Other Metals) to Light written by Michael Faraday and published by . This book was released on 1857 with total page 42 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Journal by : American Chemical Society
Download or read book Journal written by American Chemical Society and published by . This book was released on 2004 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Comprehensive Nanoscience and Technology by :
Download or read book Comprehensive Nanoscience and Technology written by and published by Academic Press. This book was released on 2010-10-29 with total page 2785 pages. Available in PDF, EPUB and Kindle. Book excerpt: From the Introduction: Nanotechnology and its underpinning sciences are progressing with unprecedented rapidity. With technical advances in a variety of nanoscale fabrication and manipulation technologies, the whole topical area is maturing into a vibrant field that is generating new scientific research and a burgeoning range of commercial applications, with an annual market already at the trillion dollar threshold. The means of fabricating and controlling matter on the nanoscale afford striking and unprecedented opportunities to exploit a variety of exotic phenomena such as quantum, nanophotonic and nanoelectromechanical effects. Moreover, researchers are elucidating new perspectives on the electronic and optical properties of matter because of the way that nanoscale materials bridge the disparate theories describing molecules and bulk matter. Surface phenomena also gain a greatly increased significance; even the well-known link between chemical reactivity and surface-to-volume ratio becomes a major determinant of physical properties, when it operates over nanoscale dimensions. Against this background, this comprehensive work is designed to address the need for a dynamic, authoritative and readily accessible source of information, capturing the full breadth of the subject. Its six volumes, covering a broad spectrum of disciplines including material sciences, chemistry, physics and life sciences, have been written and edited by an outstanding team of international experts. Addressing an extensive, cross-disciplinary audience, each chapter aims to cover key developments in a scholarly, readable and critical style, providing an indispensible first point of entry to the literature for scientists and technologists from interdisciplinary fields. The work focuses on the major classes of nanomaterials in terms of their synthesis, structure and applications, reviewing nanomaterials and their respective technologies in well-structured and comprehensive articles with extensive cross-references. It has been a constant surprise and delight to have found, amongst the rapidly escalating number who work in nanoscience and technology, so many highly esteemed authors willing to contribute. Sharing our anticipation of a major addition to the literature, they have also captured the excitement of the field itself in each carefully crafted chapter. Along with our painstaking and meticulous volume editors, full credit for the success of this enterprise must go to these individuals, together with our thanks for (largely) adhering to the given deadlines. Lastly, we record our sincere thanks and appreciation for the skills and professionalism of the numerous Elsevier staff who have been involved in this project, notably Fiona Geraghty, Megan Palmer and Greg Harris, and especially Donna De Weerd-Wilson who has steered it through from its inception. We have greatly enjoyed working with them all, as we have with each other.
Book Synopsis Glucose Sensing by : Chris D. Geddes
Download or read book Glucose Sensing written by Chris D. Geddes and published by Springer Science & Business Media. This book was released on 2007-12-29 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt: An essential reference for any laboratory working in the analytical fluorescence glucose sensing field. The increasing importance of these techniques is typified in one emerging area by developing non-invasive and continuous approaches for physiological glucose monitoring. This volume incorporates analytical fluorescence-based glucose sensing reviews, specialized enough to be attractive to professional researchers, yet appealing to a wider audience of scientists in related disciplines of fluorescence.
