Development of Polymer Films Embedded with Anisotropic Metal Nanoparticles and a Photosensitizer Dye for Antimicrobial Purposes PDF Download
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Author: Francesco Rossi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Francesco Rossi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Andreas Heilmann
Publisher: Springer Science & Business Media
ISBN: 9783540431510
Category : Medical
Languages : en
Pages : 236
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Book Description
This book presents an overview of nanostructure determination and ways to find relationships to the electronic and optical properties. The methods described can be applied to a large number of other granular metal-insulator systems and used as a guideline for characterisation and modelling. In addition, the book describes the manufacture of artificially structured nanomaterials using laser or electron-beam irradiation.
Author: Ahmed Zaky Sayed
Publisher:
ISBN: 9783330017092
Category :
Languages : en
Pages :
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Author: Abbass A. Hashim
Publisher: BoD – Books on Demand
ISBN: 9533070595
Category : Technology & Engineering
Languages : en
Pages : 340
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Book Description
This book provides a timely overview of a current state of knowledge of the use of polymer thin film for important technological applications. Polymer thin film book covers the scientific principles and technologies that are necessary to implement the use of polymer electronic device. A wide-ranging and definitive coverage of this emerging field is provided for both academic and practicing scientists. The book is intended to enable readers with a specific background, e.g. polymer nanotechnology, to become acquainted with other specialist aspects of this multidisciplinary field. Part A of the book covers the fundamental of the key aspect related to the development and improvement of polymer thin film technology and part B covers more advanced aspects of the technology are dealt with nano-polymer layer which provide an up-to-date survey of current research directions in the area of polymer thin film and its application skills.
Author: Wolfgang Knoll
Publisher: Wiley-VCH
ISBN: 9783527321902
Category : Science
Languages : en
Pages : 0
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Book Description
Very thin film materials have emerged as a highly interesting and useful quasi 2D-state functionality. They have given rise to numerous applications ranging from protective and smart coatings to electronics, sensors and display technology as well as serving biological, analytical and medical purposes. The tailoring of polymer film properties and functions has become a major research field. As opposed to the traditional treatise on polymer and resin-based coatings, this one-stop reference is the first to give readers a comprehensive view of the latest macromolecular and supramolecular film-based nanotechnology. Bringing together all the important facets and state-of-the-art research, the two well-structured volumes cover film assembly and depostion, functionality and patterning, and analysis and characterization. The result is an in-depth understanding of the phenomena, ordering, scale effects, fabrication, and analysis of polymer ultrathin films. This book will be a valuable addition for Materials Scientists, Polymer Chemists, Surface Scientists, Bioengineers, Coatings Specialists, Chemical Engineers, and Scientists working in this important research field and industry.
Author: Rappal Sangameswara Krishnan
Publisher:
ISBN:
Category : Nanoparticles
Languages : en
Pages : 270
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Author: Wendy Wing Yeun Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Author: Jing Gao
Publisher:
ISBN:
Category :
Languages : en
Pages : 338
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Book Description
Using benzophenone (BP) as a photochemical cross-linker allows for a truly versatile approach to create surfaces with various practical functionalities. The use of BP pendent groups offers a wide range of possibilities to design polymers with a variety of chemical functional groups and/or combine with delicate nano- or micro- structures to achieve specialized interfacial properties of substrates. Herein, a series of antimicrobial small molecules and polymers were prepared and successfully grafted to surfaces trigger by mild UV irradiation. The biocidal components of such materials utilizes long alkyl chain substituted poly quaternary ammoniums (PQA). The kinetics of the photo-cross-linking of BP containing PQA were studied using UV-vis spectroscopy and high efficiency of BP-activated surface grafting was realized. Covalently functionalized surfaces were afforded with excellent antimicrobial activity on contact with Staphylococcus aureus and Escherichia coli in a non-leaching fashion. In addition, one of the hypothesized antibacterial mechanism of surface bound PQA, "phospholipid sponge effect," was verified using BP/dodecyl pendent quaternary polyethyleneimine (PEI) films. The action of anionic lipid abstraction by porous PQA was confirmed by studying the swelling behavior of the polymer films with gradient cross-linking density exposed to anionic and neutral lipid solutions. This hypothesis was further supported by the fact that the antibacterial efficacy of PQA films gradually reduced with increase in cross-linking density. An approach to enhance the antimicrobial activity of biocompatible polymers were established by combing BP-based PQA coating with embedded nitrous oxide releasing agent. Functionalized CarboSil prepared via this method showed higher antibacterial efficacy compared to either antibacterial agent alone towards two major bacteria involved in urinary track infections, Staphylococcus aureus and Pseudomonas aeruginosa. Another functionality, anti-icing, was immobilized on glass and plastic surfaces using a BP pendent fluorinated copolymer that were prepared using free radical polymerization. In order to maximize the surface roughness which is critical to icephobic coatings, silica nanoparticles were dispersed within the polymer matrix to generate a hierarchical topography. The nanocomposites functionalized surfaces successfully prevent ice formation upon impinging of supercooled water. Finally, by studying the commoner effect on the mechanical durability of the BP pendent polymers, the robustness of the surface- grafted composites was improved, providing guidelines to design rapid and durable coatings using BP photo-cross-linker.
Author: Daniel Klinger
Publisher: Springer
ISBN: 9783319032719
Category : Technology & Engineering
Languages : en
Pages : 224
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Book Description
The triggered release of functional compounds from such polymeric carriers as micelles, nanoparticles or nanogels is a rapidly developing and highly versatile concept which is expected to be one of the key approaches to future therapeutics. In his thesis, Daniel Klinger highlights the approach of stimuli-responsive microgels for such applications and discusses why especially light as a trigger has an outstanding position amongst the family of conventional stimuli. Based on these considerations, the author focuses on the design, synthesis and characterization of novel photo-sensitive microgels and nanoparticles as potential materials for the loading and light-triggered release/accessibility of functional compounds. Starting from the synthesis of photo-cleavable organic building blocks and their use in the preparation of polymeric nanoparticles, continuing to the examination of their loading and release profiles, and concluding with biological in vitro studies of the final materials, Daniel Klinger’s work is an excellent example of the multidisciplinary research needed for the successful development of new materials in this field and has led to a number of further publications in internationally respected journals.
Author: Yali Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 402
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Book Description
Functional plasma polymer films have gained increasing attention in recent decades to selectively modify the surface of biomaterials. Although many applications have been identified for plasma polymerisation, the fundamental aspects of plasma polymer film growth are still poorly understood. In this thesis, both the film growth mechanism and applications of the coatings to control cell and microbe attachment in vitro were investigated. The main part of the thesis focused on fabrication of diethylene glycol dimethyl ether (diglyme, DG) plasma polymer films via radio frequency glow discharge (RFGD) plasma polymerisation. By manipulation of process parameters, diglyme plasma polymer films (DGpp) could perform as low-fouling coatings that was similar to poly(ethylene glycol) (PEG) grafted layers. Systematic study on the effect of load powers to DGpp film chemistry was carried out. The surface chemistry of the synthesised films was studied by X-ray photoelectron spectroscopy (XPS) and near edge X-ray absorption fine structure (NEXAFS) spectroscopy. It was found that higher load power led to more fragmentation of the monomer, therefore less retention of ether functionality. The resultant films were used for protein adsorption, cell culture and microbe attachment studies in vitro. Films produced with high ether concentration generally were resistant to fouling, meanwhile, relatively low ether concentration allowed a higher quantity of protein adsorption, cell and microbe attachment. The DGpp films were very smooth in nature. They have been deposited onto amyloid fibril networks (AFNs) that have roughness greater than the film per se. The change in roughness resulted in differences in amount of cell attachment and spreading. The unique structure of the AFNs was still visible under atomic force microscopy (AFM) after DGpp deposition, thus a study to decipher the mechanism of film growth was conducted. During the deposition of the films, various substrates, such as silicon wafers, glass and polymers, were used to test the adhesion strength of DGpp films. On silicon wafers, the films were stable in atmospheric conditions but became patchy after immersion in water or cell culture solutions for prolonged times. In addition, it was found DGpp films were most stable on polymeric substrates but were easily delaminated from indium tin oxide (ITO) coated glass. The low adhesion strength on ITO glass was exploited further in this thesis to expose the substrate-film interface by peeling off the film using double-sided tape. This simple method allowed investigation of the chemistry of the DGpp films growth at the initial stage. Adhesion of plasma polymer film to the substrate depends on the interaction of gas phase species in the plasmas with the top surface of the material. In order to gain a better understanding of the interface mixing between plasma polymer films and polymeric substrates, DGpp films were deposited (under the same conditions) onto six types of plasma polymer films. Non-invasive methods, neutron and X-ray reflectometry (NR, XRR) were employed to characterise these bilayer constructs and showed changes in interfacial width depending on the base plasma polymer layer. Since the DGpp film was not very efficient in antimicrobial application for the long term, a new plasma polymer based route was selected to combat the infection problem of biomaterial surfaces. A brominated coating was produced using RFGD plasma polymerisation and modified with sodium azide to incorporate azide functionality onto the surface. The resultant coatings were tested in vitro against Staphylococcus epidermidis, Pseudomonas aeruginosa and Candida albicans. Excellent antimicrobial property was presented on azide immoblised surfaces. On the other hand, those coatings are compatible with HeLa cell culture and induced minimal lysis of human erythrocytes.
