Download or read book Characterization of Interfaces Between Polymers and Substrates Using Surface enhanced Raman Scattering written by Wen-Hsien Tsai and published by . This book was released on 1991 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Destructive Characterization of Polymer Metal Interfaces Using Surface Enhanced Raman Scattering SERS written by F. J. Boerio and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) is an analytical technique in which the Raman scattering cross-sections of molecules adsorbed onto the roughened surfaces of certain metals are enhanced by as much as six orders of magnitude compared to their value for normal Raman scattering. Many models have been proposed to explain SERS, but it is now considered that most of the enhancement is related to two mechanisms. The first is associated with the large electric fields that can be induced at the surfaces of metal particles having small radii of curvature. The second is associated with formation of charge-transfer complexes between the adsorbed molecules and the substrate. Enhancement due to the charge transfer mechanism is obtained only for molecules immediately adjacent to the surface, but enhancement due to electromagnetic mechanism may extend several monolayers away from the surface. Considering that normal Raman scattering by polymers is weak and that scattering by molecules adjacent to the substrate is strongly enhanced, it is evident that SERS can be used for non-destructive characterization of interfaces between polymer films and metals as long as the films are not so thick that scattering by the bulk of the film is comparable in intensity to SERS from the interface. Keywords: DD Form 1473, Nondestructive characterization, Polymer/Metal interfaces, Surface-enhanced raman scattering, SERS, Adsorption, Silver, Acrylic adhesive system.
Download or read book Characterization of Polymer Surfaces and Interfaces Using Surface enhanced Raman Scattering written by Pel-Pel Hong and published by . This book was released on 1992 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Non Destructive Characterization of Polymer Metal Interphases Using Surface Enhanced Raman Scattering written by F. J. Boerio and published by . This book was released on 1990 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface enhanced Raman scattering (SERS) is an analytical technique in which the Raman scattering cross sections of molecules adsorbed onto the roughened surfaces of certain metals are enhanced by as much as six orders of magnitude compared to their value for normal Raman scattering. The mechanisms are associated with the large electric fields that can be induced at the surfaces of metal particles having small radii of curvature and with formation of charge transfer complexes between the adsorbed molecules and the substrate. Enhancement due to the charge transfer mechanism is obtained only for molecules immediately adjacent to the surface but enhancement due to the electromagnetic mechanism may extend several monolayers away from the surface. Since normal Raman scattering by polymers is weak and scattering by molecules adjacent to the substrate is strongly enhanced, SERS can be used for nondestructive characterization of interfaces between polymer films and metals. Silver, Polymers, Materials, Acrylic monomer, Cumene, Hydroperoxide(CHP), Acetylphenylhydrazine(APH), Saccharin, Adhesives, Pyromellitic diimide (PMDI), Surface properties. (JG).
Download or read book Non Destructive Characterization of Polymer Interphases and In Situ Polymerization Using Surface Enhanced Raman Scattering written by and published by . This book was released on 1992 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The molecular structure of interphases between substrates such as metals and graphite and polymer systems cured against them was determined using surface analysis techniques such as reflection-absorption infrared spectroscopy, X-ray photoelectron spectroscopy, and surface enhanced Raman scattering. It was found that the substrates had a significant effect on the molecular structure of the interphase and that the molecular structure of the interphase was significantly different from that of the bulk polymers. In some cases, there was a vigorous reaction between components of the polymer system and the substrate. Thus, when an acrylic adhesive was cured against silver substrates, o-benzoic sulfimide, a component of the curing system, segregated to the interface and reacted with metal ions to form salts. The salts reacted with a peroxide in the curing system to form radicals which initiated polymerization. In other cases, components of the polymer preferentially adsorbed onto the substrate. Thus the curing agent dicyandiamide was adsorbed at the interface between an epoxy and silver. The behavior of polyamic acids was strongly affected by substrates they were deposited on.
Download or read book Characterization of Polymer Interphases Using Surface Enhanced Raman Scattering written by F. J. Boerio and published by . This book was released on 1990 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) and reflection-absorption infrared spectroscopy (RAIR) were used to determine the molecular structure of interphases between polymers and metal substrates. An interesting example was provided by pyromellitic diimide (PMDI), a model compound for polyimides, and silver substrates. Normal Raman spectra of PMDI were characterized by strong bands near 1772, 1370, 760, and 655 1/cm and medium intensity bands near 1630 and 1205 1/cm were weak in SERS spectra obtained from films of PMDI spin-coated onto silver island films while those near 1370 and 1205 1/cm and a new band near 685 1/cm were strongest. Differences between the normal Raman and SERS spectra were related to orientation effects indicating that PMDI was absorbed onto silver with a vertical conformation in which the rings were perpendicular to the surface and one imide group was in contact with the surface. Keywords: Polymer interphases, Surface enhanced raman scattering, Molecular structures, Thin films, RAIR, SERS, DD Form 1473, Spectroscopy. (JG).
Download or read book Surface Enhanced Raman Scattering written by and published by . This book was released on 1989 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) is a process in which the Raman scattering cross section of molecules adsorbed onto the surfaces of metals such as silver, copper, and gold is increased by as much as six orders of magnitude. However, the enhancement is short-range and is restricted to the first few layers of molecules adjacent to the surface. As a result, SERS can be used to characterize adsorption of organic compounds onto metals and can be used for non-destructive characterization of interfaces between polymer films and metal substrates as long as the polymer films are not so thick that normal Raman scattering from the bulk of the film is more intense than SERS from the interface. SERS spectra were obtained from bilayers prepared by spin-coating thin films of polymers such as polystyrene onto silver island films and then overcoating them with much thicker films of a second polymer such as polystyrene sulfonate. The spectra were characteristic of the films adjacent to the silver and not the overlayers as long as the thickness of the films adjacent to the substrate was more than about 100 A in thickness. SERS spectra obtained from thick films of an acrylic adhesive spin-coated onto silver were identical to normal Raman spectra of salts of saccharin, a component of the cure system, and to SERS spectra of saccharin, indicating that saccharin segregated to the adhesive/substrate interface and adsorbed onto the substrate by dissociation. (aw).
Download or read book Polymer Surfaces and Interfaces II written by W. J. Feast and published by John Wiley & Sons. This book was released on 1993-04-28 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collection of review papers which give an up-to-date interdisciplinary view of current technology and research on polymer surfaces. Contributors are drawn from both academia and industry, and represent a cross-section of subject interests.
Download or read book Characterization of Composite Materials written by Hatsuo Ishida and published by Elsevier. This book was released on 2013-10-22 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Now, in one book, there is coverage of modern surface analytical techniques applied specifically to composite materials. Centering around spectroscopic characterization of composites and polymer-matrix composities, Characterization of CompositeMaterials covers techniques with a demonstrated use for composite stuides along with promising new techniques such as STM/AFM and special Raman spectroscopy. Each chapter will cover a specific technique and will provide basic background information, theories of the technique, and application examples, including futuristic state-of-the-art applications. Detailed information about the individual characterization techniques mentioned can be found in the Encyclopaedia of Materials Cahracterization, the companion volume in the Materials Characterization Series: surfaces, interfaces, thin films.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1992 with total page 1572 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Characterization of Model Polyimide Silver Interphases Using Surface Enhanced Raman Scattering written by W. H. Tsai and published by . This book was released on 1990 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) was used to investigate the adsorption of model compounds for polymides onto silver island films and onto highly oriented pyrolytic graphite (HOPG). SERS spectra of pyromellitic diimide (PMDI) adsorbed onto silver island films were mostly independent of the thickness of the PMDI films, confirming the SERS is an interfacial rather than bulk effect and that SERS can be used to examine the interface between an adsorbed film and a metal substrate without interference from normal Raman scattering by the bulk of the film. Differences in the relative intensities of several bands in the normal Raman and SERS spectra of PMDI adsorbed onto silver island films were related to orientation effects. It was concluded that most molecules were physisorbed with a vertical configuration in which the plane of the molecules was perpendicular to the surface and one imide group was adjacent to the surface. Keywords: Phthalimide(PIMH), Molecule structures, Organic chemistry, Adsorption, Surface properties. (JG).
Download or read book Characterization of Substrates for Surface enhanced Raman Scattering written by B. M. Atkinson and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Polymer Surfaces and Interfaces Characterization Modification and Application written by Kash L. Mittal and published by CRC Press. This book was released on 2023-01-06 with total page 435 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polymeric materials are used for a legion of applications in a wide array of technological areas, and their proper surface/interface characteristics are of cardinal importance for their applications. Therefore, the need to characterize polymer surfaces/interfaces and their suitable modification to impart desired characteristics is quite patent. This book chronicles the proceedings of the Symposium on Polymer Surfaces and Interfaces: Characterization, Modification and Application held as a part of the Society of Plastics Engineers Annual Technical Conference, Boston, May 7--11, 1995. The articles in this book address many aspects of polymer surfaces and interfaces. Topics covered include: various ways (chemical, photochemical, laser, flame, corona) to modify polymer surfaces; modification of contact lens surfaces; various ways to analyze/characterize polymer surfaces; metal/polymer interfaces; metal/polyimide adhesion; metal/self-assembled organic monolayer interfaces; polymer alignment layers for liquid crystals; alignment of liquid crystal surfaces; polyimide alignment layers; molecular re-orientation of polymer surfaces; plasma polymerized organic coatings; epoxy/fiber interphase; epoxy underfill materials for packaging integrated circuits; transport in polymers; polymer miscibility; and cell adhesion.
Download or read book Surface Enhanced Vibrational Spectroscopy written by Ricardo Aroca and published by John Wiley & Sons. This book was released on 2006-05-01 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface Enhanced Vibrational Spectroscopy (SEVS) has reached maturity as an analytical technique, but until now there has been no single work that describes the theory and experiments of SEVS. This book combines the two important techniques of surface-enhanced Raman scattering (SERS) and surface-enhanced infrared (SEIR) into one text that serves as the definitive resource on SEVS. Discusses both the theory and the applications of SEVS and provides an up-to-date study of the state of the art Offers interpretations of SEVS spectra for practicing analysts Discusses interpretation of SEVS spectra, which can often be very different to the non-enhanced spectrum - aids the practicing analyst
Download or read book Spectroscopy of Polymers written by J.L. Koenig and published by Elsevier. This book was released on 1999-09-16 with total page 509 pages. Available in PDF, EPUB and Kindle. Book excerpt: This revised and updated Second Edition of the best-selling reference/text is essential reading for students and scientists who seek a thorough and practical introduction to the field of polymer spectroscopy. Eleven chapters cover the fundamental aspects and experimental applications of the primary spectroscopic methods. The advantages and disadvantages of the various techniques for particular polymer systems are also discussed. The goal of the author is not to make the reader an expert in the field, but rather to provide enough information about the different spectroscopic methods that the reader can determine how the available techniques can be used to solve a particular polymer problem. This Second Edition contains new and updated information on techniques in IR and NMR, as well as an all-new chapter on Mass Spectrometry.
Download or read book Characterization of Interphases Between PMDA 4 BDAF Polyimides and Silver Substrates Using Surface Enhanced Raman Scattering and Reflection Absorption Infrared Spectroscopy written by and published by . This book was released on 1990 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Surface-enhanced Raman scattering (SERS) and reflection-absorption infrared spectroscopy (RAIR) were used to determine the molecular structure of interphases formed by curing the polyamic acid of pyromellitic dianhydride (PMDA) and 2,2-BIS(4-(4-aminophenoxy)-phenyl)-hexafluoropropane (4-BDAF) against silver substrates. SERS spectra of the cured polymer were more simular to the SERS spectra of the polyamic acid than to the normal Raman spectrum of the polymide, indicating that curing of the polymer was inhibited by interaction of the polyamic acid with the substrate. Thus, the strongest band in the normal RAMAN spectrum of the polymide was near 1406 cm-1 and was assigned to the CNC axial stretching mode.
Download or read book Characterization of the Electrochemical Interface by Surface Enhanced Raman Scattering written by Dipankar Roy and published by . This book was released on 1986 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt:
