Готові списки джерел за темами / Polymeric layer

Добірка наукової літератури з теми "Polymeric layer"

Автор: Grafiati
Опубліковано: 14 липня 2022

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Зміст

  1. Статті в журналах
  2. Дисертації
  3. Книги
  4. Частини книг
  5. Тези доповідей конференцій
  6. Звіти організацій

Статті в журналах з теми "Polymeric layer":

1

SHEN, Jia-cong. "LAYER-BY-LAYER ASSEMBLED POLYMERIC FILM." Acta Polymerica Sinica 008, no. 7 (September 15, 2008): 644–50. http://dx.doi.org/10.3724/sp.j.1105.2008.00644.

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2

SUN, Junqi. "LAYER-BY-LAYER ASSEMBLY OF POLYMERIC COMPLEXES." Acta Polymerica Sinica 011, no. 9 (September 21, 2011): 923–31. http://dx.doi.org/10.3724/sp.j.1105.2011.11134.

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3

Gotlib, Yu Ya, A. A. Darinskii, A. V. Lyulin, and I. M. Neyelov. "Dynamics of polymeric layer structures." Polymer Science U.S.S.R. 32, no. 4 (January 1990): 749–56. http://dx.doi.org/10.1016/0032-3950(90)90399-q.

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4

Hernández, Sebastián, Cassandra Porter, Xinyi Zhang, Yinan Wei, and Dibakar Bhattacharyya. "Layer-by-layer assembled membranes with immobilized porins." RSC Advances 7, no. 88 (2017): 56123–36. http://dx.doi.org/10.1039/c7ra08737c.

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5

Soler, Maria A. G. "Layer-by-layer assembled iron oxide based polymeric nanocomposites." Journal of Magnetism and Magnetic Materials 467 (December 2018): 37–48. http://dx.doi.org/10.1016/j.jmmm.2018.07.035.

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6

Chen, Ming‐Yuan, Duu‐Jong Lee, and J. H. Tay. "Extracellular Polymeric Substances in Fouling Layer." Separation Science and Technology 41, no. 7 (June 2006): 1467–74. http://dx.doi.org/10.1080/01496390600683597.

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7

Jafari, Amin, Haotian Sun, Boyang Sun, Mohamed Alaa Mohamed, Honggang Cui, and Chong Cheng. "Layer-by-layer preparation of polyelectrolyte multilayer nanocapsules via crystallized miniemulsions." Chemical Communications 55, no. 9 (2019): 1267–70. http://dx.doi.org/10.1039/c8cc08043g.

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8

Papavinasam, S., B. Arsenault, M. Attard, and R. W. Revie. "Metallic Under-Layer Coating as Third Line of Protection of Underground Oil and Gas Pipelines from External Corrosion." Corrosion 68, no. 12 (July 11, 2012): 1146–53. http://dx.doi.org/10.5006/0566.

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This paper presents the concept of introducing a third line of defense in the form of a metallic under-layer coating—in addition to the traditional polymeric coating and applied cathodic protection (CP)—to protect the external surface of oil and gas pipelines. The three levels of protection would be the metallic under-layer coating, the polymeric top-layer coating, and the applied CP. This three-level system would be beneficial when the applied CP current is shielded from the pipeline by a dis-bonded polymeric coating, thermal insulator, or highly resistive soil. Two different combinations of metallic under-layer and polymeric top-layer coatings are presented to demonstrate this concept: 48%Zn and 52%Al under-layer with four different top-layer coatings: fusion-bonded epoxy (FBE), composite, urethane, and coal tar epoxy. Urethane top-layer coating with four different metallic under-layers: 48%Zn-52%Al, 85%Zn-15%Al, Al, and Zn. The criteria for the successful application of this concept also have been described.
9

V-Niño, Ely, Andrés Díaz Lantada, Quentin Lonne, Hugo Estupiñán Durán, Enrique Mejía-Ospino, Gustavo Ramírez-Caballero, and José Endrino. "Manufacturing of Polymeric Substrates with Copper Nanofillers through Laser Stereolithography Technique." Polymers 10, no. 12 (November 29, 2018): 1325. http://dx.doi.org/10.3390/polym10121325.

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This study presents the additive manufacture of objects using mass-functionalized photo-resins, which are additively photopolymerized using the laser stereolithography technique. The mass functionalization is based on the incorporation of copper nanowires used as fillers at different concentrations. Cylindrical and tensile test probes are designed and manufactured in a layer-by-layer approach using a low-cost laser stereolithography system working with a layer thickness of 100 µ m . The morphological, mechanical, thermal and chemical results help to show the viability and potential that this combination of mass-functionalized resins and technological processes may have in the near future, once key challenges are solved. Finally, some potential applications are also discussed.
10

Borges, João, Luísa C. Rodrigues, Rui L. Reis, and João F. Mano. "Layer-by-Layer Assembly of Light-Responsive Polymeric Multilayer Systems." Advanced Functional Materials 24, no. 36 (July 14, 2014): 5624–48. http://dx.doi.org/10.1002/adfm.201401050.

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Статті в журналах Дисертації Книги

Дисертації з теми "Polymeric layer":

1

Authimoolam, Sundar Prasanth. "STABILITY OF AFFINITY BASED LAYER-BY-LAYER POLYMERIC SELF-ASSEMBLIES FOR ORAL WOUND APPLICATIONS." UKnowledge, 2011. http://uknowledge.uky.edu/cme_etds/3.

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Oral mucositis is a painful and debilitating chronic inflammatory condition that can result from chemo and/or radiotherapy. While current treatment strategies which provide temporary relief exist, there is still an unmet clinical need for a robust long active barrier strategy which can simultaneously provide protection and release drug to enhance the wound healing response. It is proposed that an affinity based layer-by-layer self-assembled barrier administered as a series of mouth rinses can allow for wound specific drug delivery, providing an effective regenerative therapy. In this work, biotinylated poly(acrylic acid) is used to develop LBL assemblies based upon biotin-streptavidin affinity interactions. To explore the ability of developed LBL assemblies to resist the harsh intraoral environment, in vitro chemical and ex vivo mechanical tests are performed. The stability results demonstrate significant LBL barrier stability with wear resistance. From principal component regression analysis, factors such as polymer MW and number of layers in assemblies contributed significantly to chemical barrier stability. Also it is observed that the extent of biotin conjugation plays a significant role in LBL development and in mechanical stability. Thus, the proposed affinity based multilayered assemblies with their excellent barrier properties offer a modular treatment approach in oral mucosal injuries.
2

Zhao, Li. "Fabrication of polymeric microcarriers with reduced permeability using layer-by-layer, surface-initiated polymerization and emulsion techniques." Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/24853.

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In recent years, polymeric microcarriers have drawn great attention because of their potential applications in medical, cosmetic and some other industries. A variety of materials, preparation techniques have been explored to endow these microcarriers the desired properties. In spite of encouraging improvements in other properties, the low permeability of microcarriers remains a challenge which results in massive amount of cargo loss due to fast release. This work aimed to develop microcarriers with reduced permeability by coating with biocompatible and hydrophobic polymers via different techniques such as Layer-by-Layer, surface-initiated atom transfer radical polymerization and emulsion methods. This thesis starts with an introduction and literature review, which present the background of this work, followed by the description of materials as well as methods used in this work in chapter 3. Chapter 4 studied various parameters for fabricating structurally intact Poly(lactic acid) stereocomplex microcapsules, and demonstrated that heat treatment could significantly reduce the permeability of PLA microcapsules. In chapter 5, Layer-by-Layer and surface-initiated atom transfer radical polymerization techniques were combined to fabricate PMMA coated microparticles with low permeability. A polyelectrolyte macroinitiator and Poly(sodium 4-styrenesulfonate) were first deposited onto CaCO3 particles through LbL process, followed by growing PMMA brush layer via ATRP from the polyelectrolyte precursor. Chapter 6 introduced a simple emulsion method to prepare PLA coated CaCO3 microparticles with low permeability, which can retain bioactive molecules within the particles. It was found that 0.8 was the optimal CaCO3/PLA mass ratio in terms of the low permeability of microparticles as well as high-usage of polymers. In chapter 7, PLA films were synthesized from two different types of macroinitiators, with one being polyelectrolyte based and the other one being Poly(2-hydroxyethyl methacrylate) polymer brush precursor. The kinetics of PLA film growth from different precursors was compared whilst degradation of PLA films was also studied.
3

Lin, Xiaofeng. "Toward nanofiltration membranes with layer-by-layer assembled and nano-reinforced separation layers." Thesis, Strasbourg, 2016. http://www.theses.fr/2016STRAE012/document.

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Ce travail de thèse a été consacré à l'élaboration d'un nouveau type de membranes de nanofiltration efficaces avec des propriétés améliorées (flux élevé et rétention élevée, et de bonnes propriétés mécaniques) en déposant un revêtement assemblé couche-par-couche (LbL) sur des supports poreux. Après avoir systématiquement étudié le mécanisme de croissance des films assemblés couche par couche des polyélectrolytes choisis et la relation entre les structures de ces films et les performances des membranes résultant, nous avons identifié avec succès les meilleures structures multicouches pour la construction de membranes de nanofiltration de référence avec des performances optimales. En outre, en prenant avantage de la technique LbL, nous avons introduit une couche de diffusion latérale assemblée soit de nanofibrilles de cellulose ou de nanotubes de carbone, qui permet d’augmenter le flux de 30% tout en conservant la même rétention par rapport à la membrane de référence. En plus, les films assemblés à base de chitosan et nanofibrils de cellulose ont montré une forte résistance à la traction allant jusqu’à 450 MPa et un module d’Young jusqu’à 50 GPa
This thesis work was devoted to the development of a novel and efficient nanofiltration membrane with improved properties (high flux and high retention, good mechanical strength) by coating Layer-by-Layer (LbL) assembled films onto porous membrane support. After having systematically studied the growth mechanism of LbL-assembled films of chosen polyelectrolytes and the relationship between the structures of these films and the membrane performance of the resulting NF membranes, we successfully identified the best multilayer structures for constructing nanofiltration membranes (NF) of reference with optimal membrane performance. Furthermore, taking advantages of the LbL-assembly, we successfully introduced LbL-assembled lateral diffusion layer that is made of either cellulose nanofibrils or carbon nanotubes, which in turn led to membranes with 30% higher flux. In addition, the LbL-assembled films of chitosan and cellulose nanofibrils showed surprisingly strong tensile strength of up to 450 MPa and a high Young modulus of up to 50 GPa
4

Guzy, Matthew Thomas. "Organic Self-Assembled Layer-by-Layer Thin Films for Second-Order Nonlinear Optics." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/28852.

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Layer-by-layer deposition techniques were used to fabricate films with second order nonlinear optical (NLO) properties. These materials are key to the development of electro-optic modulators used in fiber optic communication systems. Performance benefits and lower manufacturing costs are driving the development of organic NLO materials as replacements for inorganic crystalline materials such as lithium niobate. The layer-by-layer deposition technique in which polyelectrolytes are deposited on a surface by electrostatic effects is called the Ionically Self-Assembled Monolayer or ISAM method. The role of the optically inactive polycation's structure on deposition and chromophore orientation was studied by fabricating films with several different polycations. While the specific interactions responsible for chromophore orientation in ISAM films remains unclear, hydrogen bonding and electrostatic effects are ruled out as the sole sources of orientation. The highest values of &967;(2) were observed under pH conditions that resulted in flat and thin layers. The relationship between pH and the optical homogeneity of the film was also explored. Deposition of polymers under pH conditions in which the polymer chains were aggregated in solution results in films that are not suitable for use in devices. In this work, a new layer-by-layer deposition technique was developed. Coined hybrid deposition, it relies on covalent bonds and electrostatic interactions for film fabrication. Optically inactive polyamines were used as sources of positive charges and as binding sites with optically active low molecular weight chromophores functionalized with a reactive triazine ring and negative charged sulfonate groups. Polar ordering of the chromophores was obtained when the deposition was done under conditions in which covalent bonding was the preferred attachment mechanism for the chromophore molecules. pH conditions in which electrostatic attachment dominated resulted in poorer orientation. The effect of adding ionic salts to the dye solutions was studied, with hopes of increasing the chromophore density in the film by shielding inter-dye electrostatic repulsions. A linear relationship in deposited amount, as characterized by absorbance/bilayer, was observed as the salt concentration was increased. Little effect on &967;(2) was observed for films made with the as-received Procion Red MX-5B chromophore. However, films fabricated from purified Procion Brown MX-GRN showed a definite dependence on added salt. Exceptional &967;(2) values were obtained for Procion Brown films deposited using 0.5 M NaCl and PAH. The importance of depositing from non-aggregated solutions was again highlighted, as films made with the less soluble Procion Orange were significantly less homogeneous than those made from Procion Red and Procion Brown which were highly soluble. The role of polycation structure on the deposition and orientation of Procion Brown and Red was examined.
Ph. D.
5

Ogbomo, Sunny Minister D'Souza Nandika Anne. "Processing, structure property relationships in polymer layer double hydroxide multifunctional nanocomposites." [Denton, Tex.] : University of North Texas, 2009. http://digital.library.unt.edu/ark:/67531/metadc12174.

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6

Ogbomo, Sunny Minister. "Processing, structure property relationships in polymer layer double hydroxide multifunctional nanocomposites." Thesis, University of North Texas, 2009. https://digital.library.unt.edu/ark:/67531/metadc12174/.

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Dan Beaty (1937-2002) was a prolific composer, pianist, researcher, educator, and writer. His large compositional output included chamber works, choral works, songs, orchestral pieces, electronic music, and keyboard works. Beaty was well versed in traditional Western music as well as the more avant-garde and perplexing idioms of the twentieth century. Beaty's compositions reflect the many fascinating, if not always popular, musical trends of his time. His music encompasses styles from serial to jazz, shows compositional influences from Arnold Schoenberg to Indonesian music, and demonstrates thought-provoking and highly intellectual craftsmanship. This document explores several of Beaty's songs through a discussion of the composer's life and compositional process. Songs included in this document are Three Weeks Songs, October, November, A Sappho Lyric, Love Song, That Night When Joy Began, and War Lyrics. This document was written to accompany the author's DMA Lecture-Recital at the University of North Texas. Unfortunately, Beaty's vocal music was never published and is mostly unknown. One goal of the project was to initiate interest in Beaty's songs. Through this document, Lecture-Recital, and additional performances, considerable strides have been made to bring Beaty's songs to new audiences throughout the United States. In addition, the author has received permission from the Beaty family to publish Dan Beaty's songs.
7

Wang, Dong. "The Application of Thin Film Ionic Self-assembled Multilayer (ISAM) Nanostructures in Electromechanical Bending Actuators and Micro-fabricated Gas Chromatography (uGC) Devices." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51186.

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Ionic self-assembled multilayer (ISAM) thin film nanostructures, including highly porous and conductive gold nanoparticles (GNP), and highly porous and thermally stable silica nanoparticles (SNP), were fabricated via the layer-by-layer (LbL) self-assembly technique. Their application in ionic polymer-metal composite (IPMC) electromechanical bending actuators and microfabricated gas chromatography (microGC) devices were investigated and significant performance improvements of these devices were achieved. IPMC bending actuators, consisting of an ionic electroactive polymer (iEAP) membrane as backbone, ionic liquids (IL) as electrolyte, and ISAM GNP thin film as porous electrode, were fabricated and investigated. The influences of humidity, conductive network composite (CNC), and IL uptake on the bending performance were examined and discussed. An equivalent circuit model to simulate both the electrical and mechanical responses was also proposed and experimentally verified. Moreover, IPMC actuators made from other newly synthesized iEAP membranes were fabricated and tested. Some of them showed promising performance that was comparable or even better as compared to the ones made from Nafion. LbL fabricated ISAM SNPs thin film coatings were also applied in the microGC devices including micro fabricated thermal preconcentrators (microTPC) and separation columns (microSC) as adsorbent and stationary phase materials, respectively. New fabrication approaches were developed to selectively coat uniform conformal ISAM SNP coatings in these devices with different 3D microstructures. Thus, functionalized microTPCs and microSCs showed good performance, which can be further improved by using the ISAM SNPs coating as a nanotemplate for modifying additional polymer adsorbents or as the anchor sites for incorporating functional molecules for targeting detection.
Ph. D.
8

Njomo, Njagi. "Synthesis of sulphonated and transition metal oxide doped polymeric nanocomposites for application in design of supercapacitors." University of the Western Cape, 2011. http://hdl.handle.net/11394/5429.

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Philosophiae Doctor - PhD
To meet a fast-growing market demand for next generation portable electronic devices with higher performance and increased device functionalities, efficient electrical energy devices with substantially higher energy, power densities and faster recharge times such as supercapacitors are needed. The overall aim of this thesis was to synthesize nanostructured sulphonated polyaniline and transition metal single, binary and ternary mixed oxide doped nanocomposites with electro-conductive properties. These nanocomposites were anchored on activated graphitic carbon and used in design of asymmetric supercapacitors. Tantalum(IV)oxide, tantalum(IV)oxide-nickel(II)oxide, tantalum(II)oxide-manganese(III)oxide, tantalum(II)oxide-nickel(II)oxide-manganese(II,III)oxide nanoparticles were synthesised using modified sol-gel methods. These were then dispersed, individually, in acidic media through sonication and incorporated in-situ into the polymeric matrix during the oxidative chemical polymerization of aniline doped with poly(4-styrene sulphonic acid). These novel polymeric nanocomposites were characterised with FTIR, UV-visible, TEM, SEM, EDS, XRD to ascertain successful polymerization, doping, morphology and entrapment of the metal oxide nanoparticles. SECM approach curves and interrogation of CV revealed that these nanocomposites are conductive and electro-active. The cells showed good supercapacitor characteristics with high specific capacitances of 170.5 Fg⁻¹ in TaO₂- PANi-PSSA, 166.1 Fg⁻¹ in TaO₂-NiO-PANi-PSSA, 248.4 Fg-1 in TaO-Mn₂O₃-PANi- PSSA and 119.6 Fg⁻¹ in TaO-NiO-Mn₃O₄-PANi-PSSA. Their corresponding energy densities were calculated as 245.5 Whg⁻¹, 179.4 Whg⁻¹, 357.7 Whg⁻¹ and 172.3 Whg⁻¹ respectively. They also gave respective power densities of 0.50 Whg⁻¹, 0.61 Whg⁻¹, 0.57 Whg⁻¹ and 0.65 Whg⁻¹ and showed good coulombic efficiencies ranging between 77.97% and 83.19%. These materials are found to have a long cycle life and therefore good electrode materials for constructing supercapacitor cells.
National Research Foundation (NRF)
9

Ripollés, Sanchis Teresa. "Interfacial and Bulk Operation of Polymeric Solar Cells by Optoelectronics and Structural Techniques." Doctoral thesis, Universitat Jaume I, 2014. http://hdl.handle.net/10803/277095.

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This Ph.D. Thesis focuses on the investigation of organic photovoltaic (OPV) technology, especially in aspects of experimental device processing, and optoelectronic and electrical characterization on OPV devices to be readily marketable. More specifically, the topics addressed are the following: origin of recombination current,open-circuit voltage and crystallinity, transport driving force, contact selectivity and interface states, alternative hole transporting layers and oxygen and degradation routes.
10

Serpe, Michael Joseph. "Self-Assembly of Poly(N-isopropylacrylamide) Microgel Thin Films." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4806.

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The assembly of poly(N-isopropylacrylamide-co-acrylic acid) (pNIPAm-co-AAc) microgel thin films into disordered and ordered arrays was investigated. Disordered pNIPAm-co-AAc microgel arrays were assembled based on electrostatic attractions between polyanionic pNIPAm-co-AAc microgels and polycationic poly(allylamine hydrochloride) (PAH). These interactions were studied in solution and subsequently used to assemble thin films following a Layer-by-Layer assembly protocol. Thin films were assembled as a function of pNIPAm-co-AAc microgel solution temperature and the resultant film thermoresponsivity characterized as a function of microgel layer number and pH. The response of assembled thin films to pH 3.0 and 6.5 exposure was then characterized by quartz crystal impedance and surface plasmon resonance spectroscopy, which showed that the thin film solvation was highly dependent on the pH of the solution it was in. Assembled thin films were also shown to be useful as controlled drug delivery platforms, where it was found that small molecules could be released from the films in a temperature regulated fashion. Microgel thin films also exhibited unique optical properties and were used as microlens arrays, which were able to focus pattern in air as well as in solution and had focal lengths that could be tuned in response to pH and temperature changes. Ordered microgel arrays were assembled following a thermal annealing process, in order to make light diffracting materials. These ordered arrays were photopolymerized and exhibited temperature dependent Bragg diffraction properties.
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Книги з теми "Polymeric layer":

1

Wünsche, P., ed. Polymeric Layers. Darmstadt: Steinkopff, 1991. http://dx.doi.org/10.1007/bfb0114802.

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2

Dušek, Karel, J. F. Joanny, and J. F. Berret. Polymer characterization: Rheology, laser interferometry, electrooptics. Heidelberg: Springer, 2010.

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3

Lloyd, Paul Maxwell. Matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry of synthetic polymers. [s.l.]: typescript, 1998.

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4

Scudder, Lawrence Philip. Characterisation and testing of carbon fibre reinforced polymer composites using laser generated ultrasound. [s.l.]: typescript, 1994.

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5

Kopecký, Dušan. Deposition of polypyrrole thin films by advanced method: Matrix assisted pulsed laser evaporation. Hauppauge, N.Y: Nova Science Publishers, 2011.

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6

Vinogradov, B. A. Deĭstvie lazernogo izluchenii︠a︡ na polimernye materialy: Nauchnye osnovy i prikladnye zadachi v 2-kh knigakh. Sankt-Peterburg: "Nauka", 2006.

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7

Wunsche, P. Polymeric Layers. Edited by P. Wunsche. Springer, 1991.

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8

W]nsche, P. Polymeric Layers. Springer, 1996.

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9

Dusˇek, Karel, and Jean-François Joanny. Polymer Characterization: Rheology, Laser Interferometry, Electrooptics. Springer, 2012.

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10

Dusˇek, Karel, and Jean-François Joanny. Polymer Characterization: Rheology, Laser Interferometry, Electrooptics. Springer, 2010.

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Частини книг з теми "Polymeric layer":

1

Rajasekar, R., K. S. K. Sasi Kumar, and P. Sathish Kumar. "Multi Layer Pipes." In Multicomponent Polymeric Materials, 279–99. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7324-9_10.

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2

Sun, Junqi, Xiaokong Liu, and Jiacong Shen. "Layer-by-Layer Assembly of Polymeric Complexes." In Multilayer Thin Films, 135–50. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527646746.ch7.

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3

Picart, Catherine. "Bioactive Layer-By-Layer Films to Stimulate Cell Growth and Differentiation." In Encyclopedia of Polymeric Nanomaterials, 90–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_355.

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4

Picart, Catherine. "Bioactive Layer-By-Layer Films to Stimulate Cell Growth and Differentiation." In Encyclopedia of Polymeric Nanomaterials, 1–9. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-36199-9_355-1.

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5

Malucelli, Giulio. "Layer-by-Layer Assembly: A Novel Flame-Retardant Solution to Polymeric Materials." In Flame Retardant Polymeric Materials, 119–33. Boca Raton : CRC Press, [2020] | Series: Series in materials science and engineering: CRC Press, 2019. http://dx.doi.org/10.1201/b22345-7.

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6

Mao, Zhengwei, Weijun Tong, Tanchen Ren, Wenbo Zhang, Sai Wu, and Changyou Gao. "Making Polymeric Nanofilms (Grafting-to, Grafting-from, Spin Coating, Layer-by-Layer, Plasma Polymerization)." In Encyclopedia of Polymeric Nanomaterials, 1181–87. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-29648-2_361.

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7

Mao, Zhengwei, Weijun Tong, Tanchen Ren, Wenbo Zhang, Sai Wu, and Changyou Gao. "Making Polymeric Nanofilms (Grafting-to, Grafting-from, Spin Coating, Layer-by-Layer, Plasma Polymerization)." In Encyclopedia of Polymeric Nanomaterials, 1–7. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-36199-9_361-1.

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8

Zhai, Lei. "Layer-by-Layer Self-Assembled Multilayer Stimuli-Responsive Polymeric Films." In Handbook of Stimuli-Responsive Materials, 165–90. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527633739.ch7.

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9

Reddy, Narendra. "Hybrid Systems for Multi-layer Fuel and Air Hoses in Automobiles." In Multicomponent Polymeric Materials, 259–77. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7324-9_9.

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10

Richau, K., and H. H. Schwarz. "ASYMMETRIC CELLULOSE ACETATE MEMBRANES: STRUCTURE OP THE SKIN LAYER AND TRANSPORT MECHANISM." In Synthetic Polymeric Membranes, edited by Blahoslav Sedláček and Jaroslav Kahovec, 605–14. Berlin, Boston: De Gruyter, 1987. http://dx.doi.org/10.1515/9783110867374-059.

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Тези доповідей конференцій з теми "Polymeric layer":

1

Candiani, A., M. Sozzi, A. Cucinotta, and S. Selleri. "Laser processing of mono- and multi-layer polymeric materials." In 2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS). IEEE, 2014. http://dx.doi.org/10.1109/ursigass.2014.6929442.

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2

Nain, Amrinder S., Metin Sitti, and Cristina Amon. "Polymeric Micro/Nanofiber Manufacturing and Mechanical Characterization." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67955.

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Polymeric nanofibers are finding increasing number of applications and hold the potential to revolutionize diverse fields such as tissue engineering, smart textiles, sensors, and actuators. Aligning and producing long smooth, uniform and defect-free fibers with control on fiber dimensions at the submicron and nanoscale has been challenging due to fragility of polymeric materials. Besides fabrication, the other challenge lies in the ability to characterize these fibers for mechanical properties, as they are widely believed to have improved properties than bulk due to minimization of defects. In this study we present an overall strategy for fabrication and mechanical characterization of polymeric fibers with diameters ranging from sub-50 nm to sub-microns. In the proposed fabrication strategy, polymeric solution is continuously pumped through a glass micropipette which is collected in the form of aligned fiber arrays on a rotating substrate. Polymer molecular weight and polymer solution concentration play dominant roles in controlling the fiber dimensions, which can be used to deposit fibers of different diameters in the same layer or successively built up multi-layer structures. Using this approach, we demonstrate single and multi-layer architectures of several polymeric systems such as Polystyrene (PS), Poly(methyl methacrylate) (PMMA), Poly lactic acid (PLA), and poly(lactic-co-glycolic acid) (PLGA). Further, we demonstrate the ability to manufacture PMMA fixed-free boundary condition cantilevers by breaking the fixed-fixed boundary condition PMMA fibers using Atomic Force Microscope (AFM) in the lateral mode. An integrated approach for mechanical characterization of polymeric fibers is developed. In this approach, the fibers are first deposited on commercially available Transmission Electron Microscopy (TEM) grids in aligned configurations and are mapped for accurate locations under the TEM. Subsequently, the fibers are carefully placed under the AFM and mechanically characterized for flexural modulus using lateral force microscopy (LFM). Finally, accurate fiber dimensions are determined under the Scanning Electron Microscope (SEM). The unique advantage of this approach lies in the ability to deposit a large number of fibers with tunable diameters in aligned configurations with fixed-fixed boundary conditions and requires no external manipulation. Finally, we present a novel methodology to study the resonance characteristics of fixed-fixed boundary condition suspended fibers using a commercially available Laser Doppler Vibrometer (LDV) for sensor applications. The methods developed in this study will greatly aid in increasing our fundamental knowledge of polymeric materials at reduced lengthscales and allow integration of these one-dimensional building blocks in bottom-up assembly environments.
3

Elbuken, Caglar, Lin Gui, Carolyn L. Ren, Mustafa Yavuz, and M. Behrad Khamesee. "Design and Characterization of a Polymeric Photo-Thermal Microgripper for Micromanipulation." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68798.

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Photo-thermally actuated polymer (SU-8) microgrippers were designed, simulated and characterized. The microgrippers were actuated by thermal expansion of compliant polymer parts. The required heat was transferred to the devices by laser absorption. The microgrippers were made of a single SU-8 layer and dyed before the experiments for enhanced laser absorption. Finite element simulation results were used to predict the working range of the grippers. It has been demonstrated that using a simple design 22 μm of deflection can be achieved for a micro-gripper of approximately 900 μm long. The gripping experiments have demonstrated the successful operation of polymeric photo-thermal microgrippers.
4

Ngambenjawong, C., H. Phuengkham, M. Theerasilp, and N. Nasongkla. "Layer-by-layer nanocoating of chlorophene-loaded polymeric micelles on silicone catheters." In 2012 IEEE 12th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2012. http://dx.doi.org/10.1109/nano.2012.6403799.

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5

Sato, Marcel, Rafael L. Tanaka, Elson L. Albuquerque, Rafael G. Morini, and Carlos A. F. Godinho. "Effect of Material Plasticity and Metallic Layer Profiles on the Crushing Resistance of Flexible Pipes." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-10909.

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This paper presents a numerical 3D finite element model to simulate a flexible pipe under crushing-traction condition, which is a typical situation found during its laying operation. This model considers the geometry of some layers from the flexible pipe, responsible of providing the most contribution to its radial strength (e.g., interlocked carcass, internal polymeric layer, pressure armor, and external polymeric layer) and geometry of laying system shoes. It also considers the flexible pipe initial ovalization and the squeezing effect due to the tensile armor layers under traction. A numerical-experimental comparison is presented, in order to show the model validity.
6

Said, Magdi, Abdel-Fattah Seyam, Jessica Won, and Ahmed Hassanin. "Development of UV Protective Polymeric Layer for High Performance Fibers." In 11th AIAA Aviation Technology, Integration, and Operations (ATIO) Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2011. http://dx.doi.org/10.2514/6.2011-6937.

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7

Qureshi, G. J., V. K. Gupta, Amit P. Singh, Avinashi Kapoor, and K. N. Tripathi. "Four-layer polymeric optical waveguides based on styrene acrylonitrile (SAN)." In Boulder Damage, edited by Gregory J. Exarhos, Arthur H. Guenther, Keith L. Lewis, M. J. Soileau, and Christopher J. Stolz. SPIE, 2002. http://dx.doi.org/10.1117/12.461703.

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8

Ahuja, Suresh. "Interface and Dynamic Indentation of Crosslinked Polyester Films." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67693.

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Nano-indentation is increasingly used to estimate the mechanical properties of polymeric films of nanometer-scale thickness. Hardness and modulus, as obtained on indentation are parameters that are strongly dependent upon tip geometry, elastic and inelastic material behavior, and specimen boundary conditions. The objective of this study was to analyze the mechanical response of nano-indentation loading on surfaces and interfaces of polymer films both linear and cross-linked. Polymer films on nano-indentation show confinement effect on their modulus and hardness. Reduced modulus and hardness in polyester and polycarbonate show strain softening that is associated polymer chain flexibility. The spatial constraints imposed to the plastic flow of the interface layer by the rigid indenter and substrate surfaces produce a dynamic effect, demonstrated by the loading rate dependence of the deformation response. In nano-indentation of cross-linked polymers, entanglements physical and chemical affect reduced modulus and hardness dependence on strain. Strain softening and strain hardening as well as dynamic frictional response are applied to indented polymer films consisting of surface, intermediate, and interface layers.
9

Thielsch, Roland. "Composition and Thickness Related Properties of Thin Metal Layers in Multifunctional Layer Stacks on Polymeric Films." In 61st Society of Vacuum Coaters Annual Technical Conference. Society of Vacuum Coaters, 2018. http://dx.doi.org/10.14332/svc18.proc.0004.

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10

Colinjivadi, Karthik S., Yonghao Cui, Matthew Ellis, J. B. Lee, and George Skidmore. "De-Tethering of Metallic and Polymeric MEMS/NEMS Parts for the Direct Pick-and-Place Assembly of 3D Microsystem." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14818.

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We report our study on several de-tethering methods for various metallic and polymeric MEMS and NEMS parts including thick (30~100μm) metallic (nickel and its alloys) MEMS parts, sub-micron (350 nm) feature size 1 μm thick metallic NEMS parts, and thick polymer/metal bi-layer (polymer ~50μm, metal ~2μm) MEMS parts. The conventional stress-based de-tethering used in silicon would not be effective for all of these three types of devices. High current injection through narrow tethers was found to be effective and reproducible means of de-tethering thick metallic MEMS parts. But such a method could not be applied for metallic NEMS and polymer/metal bi-layer MEMS parts, as large areas near tethers were burned even with significantly reduced amount of currents. In order to de-tether these NEMS and polymer/metal bi-layer devices, we performed the milling of tethers using a focused ion beam. Very low current (20 pA) ion beam was found to be very effective means of de-tethering the metallic NEMS parts. Relatively larger current (0.3 nA) was found to be good for the polymer/metal bi-layer parts. We demonstrated 3D assembly and/or complete packaging of some of the de-tethered MEMS parts.

Звіти організацій з теми "Polymeric layer":

1

Lippert, T. Laser micromachining of chemically altered polymers. Office of Scientific and Technical Information (OSTI), August 1998. http://dx.doi.org/10.2172/661708.

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2

Singaravelu, Senthilraja. Laser Processing of Metals and Polymers. Office of Scientific and Technical Information (OSTI), May 2012. http://dx.doi.org/10.2172/1057575.

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3

Bendikov, Michael, and Thomas C. Harmon. Development of Agricultural Sensors Based on Conductive Polymers. United States Department of Agriculture, August 2006. http://dx.doi.org/10.32747/2006.7591738.bard.

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In this 1-year feasibility study, we tried polymerization of several different monomers, commercial as well as novel, specially designed and synthesized for this project in the presence of the nitrate ion to produce imprinted conductive polymers. Polymers 1 and 2 (shown below) produced a response to nitrate, but one inferior to that produced by a polypyrrole (Ppy)-based sensor (which we demonstrated prior to this study). Thus, we elected to proceed with improving the stability of the Ppy-based sensor. In order to improve stability of the Ppy-based sensor, we created a two-layer design which includes nitrate-doped Ppy as an inner layer, and nitrate-doped PEDOT as the outer layer. PEDOT is known for its high environmental stability and conductivity. This design has demonstrated promise, but is still undergoing optimization and stability testing. Previously we had failed to create nitrate-doped PEDOT in the absence of a Ppy layer. Nitrate-doped PEDOT should be very promising for sensor applications due to its high stability and exceptional sensing properties as we showed previously for sensing of perchlorate ions (by perchlorate-doped PEDOT). During this year, we have succeeded in preparing nitrate-doped PEDOT (4 below) by designing a new starting monomer (compound 3 below) for polymerization. We are currently testing this design for nitrate sensing. In parallel with the fabrication design studies, we fabricated and tested nitrate-doped Ppy sensors in a series of flow studies under laboratory and field conditions. Nitrate-doped Ppy sensors are less stable than is desirable but provide excellent nitrate sensing characteristics for the short-term experiments focusing on packaging and deployment strategies. The fabricated sensors were successfully interfaced with a commercial battery-powered self-logging (Onset Computer Hobo Datalogger) and a wireless data acquisition and transmission system (Crossbow Technologies MDA300 sensor interface and Mica2 wireless mote). In a series of flow-through experiments with water, the nitrate-doped Ppy sensors were exposed to pulses of dissolved nitrate and compared favorably with an expensive commercial sensor. In 24-hour field tests in both Merced and in Palmdale, CA agricultural soils, the sensors responded to introduced nitrate pulses, but with different dynamics relative to the larger commercial sensors. These experiments are on-going but suggest a form factor (size, shape) effect of the sensor when deployed in a porous medium such as soil. To fill the need for a miniature reference electrode, we identified and tested one commercial version (Cypress Systems, ESA Mini-reference electrode) which works well but is expensive ($190). To create an inexpensive miniature reference electrode, we are exploring the use of AgCl-coated silver wire. This electrode is not a “true” reference electrode; however, it can calibrated once versus a commercial reference electrode at the time of deployment in soil. Thus, only one commercial reference electrode would suffice to support a multiple sensor deployment.
4

Ovalle, Samuel, E. Viamontes, and Tony Thomas. Optimization of DLP 3D Printed Ceramic Parts. Florida International University, October 2021. http://dx.doi.org/10.25148/mmeurs.009776.

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Digital Light Processing (DLP) 3D printing allows for the creation of parts with advanced engineering materials and geometries difficult to produce through conventional manufacturing techniques. Photosensitive resin monomers are activated with a UV-producing LCD screen to polymerize, layer by layer, forming the desired part. With the right mixture of photosensitive resin and advanced engineering powder material, useful engineering-grade parts can be produced. The Bison 1000 is a research-grade DLP printer that permits the user to change many parameters, in order to discover an optimal method for producing 3D parts of any material of interest. In this presentation, the process parameter optimization and their influence on the 3D printed parts through DLP technique will be discussed. The presentation is focused on developing 3D printable slurry, printing of complex ceramic lattice structures, as well as post heat treatment of these DLP-produced parts.
5

Braegelmann, Peter. Developing New Polymeric Powder Feedstocks for Selective Laser Sintering: Emphasizing Particle Size and Shape. Office of Scientific and Technical Information (OSTI), June 2022. http://dx.doi.org/10.2172/1871451.

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6

Mazur, Eric, Kevin Vora, and Michael Moebius. Femtosecond-Laser Patterning of Polymers: Nonlinear and Negative Index Devices. Fort Belvoir, VA: Defense Technical Information Center, January 2011. http://dx.doi.org/10.21236/ada544800.

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7

Kim, D. Y., L. Li, J. Kumar, and S. K. Tripathy. Laser-Induced Holographic Surface Relief Gratings on Nonlinear Optical Polymer Films. Fort Belvoir, VA: Defense Technical Information Center, March 1995. http://dx.doi.org/10.21236/ada293169.

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8

Adam J. Moule. Final Closeout report for grant FG36-08GO18018, titled: Functional Multi-Layer Solution Processable Polymer Solar Cells. Office of Scientific and Technical Information (OSTI), May 2012. http://dx.doi.org/10.2172/1047857.

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9

Story, Natasha Claire. Polymer Composites Reinforced by Carbon-Allotrope Fillers for Selective Laser Sintering (SLS) - A Review. Office of Scientific and Technical Information (OSTI), March 2020. http://dx.doi.org/10.2172/1603967.

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10

Young, Steven. Evaluation of the Polymer Characterization Capabilities of Matrix-Assisted Laser Desorption/Ionization (Literature Review). Office of Scientific and Technical Information (OSTI), June 2021. http://dx.doi.org/10.2172/1798113.

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