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Literatura académica sobre el tema "Pellets and films"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Pellets and films"

Kulkarni, Apoorva, Dimple Sharma, Alexander Ermlich, Shilpa Manjure, Ramani Narayan y Teresa M. Bergholz. "Antimicrobial Solid Starch–Iodine Complex via Reactive Extrusion and Its Application in PLA-PBAT Blown Films". Polymers 16, n.º 11 (24 de mayo de 2024): 1487. http://dx.doi.org/10.3390/polym16111487.

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In this study, a solid masterbatch of starch–iodine complex with 6.7 wt.% iodine was prepared in pellet form using a ZSK-30 twin-screw extruder. Thermogravimetric (TGA) and isothermal TGA analysis of the pellets revealed that there was no significant loss of iodine due to sublimation during reactive extrusion. These solid pellets demonstrated antifungal properties when applied to strawberries via dip coating in an aqueous solution, extending their shelf life from two days to eight days, thereby reducing fungal growth and visual decay. Furthermore, the solid pellets displayed antibacterial activity against E. coli, as evidenced by the clear zone of inhibition observed in the Kirby–Bauer test. To enhance practical application, these pellets were further blended with PLA-PBAT film formulations at 10 and 18% by wt. to make blown films with effective iodine loadings of 0.7 and 1.3% by wt. These films showed superior antibacterial activity against E. coli compared with PLA control films and the commercial silver antimicrobial-containing films during direct inoculation tests as per ISO 22196. Tensile strength and elongation at break in machine direction (MD) for the starch–iodine-containing blown films were comparable to the control films in MD, but tensile strength was reduced to 37–40% in the transverse direction (TD). This was due to a non-uniform dispersion of the starch–iodine complex in the films, as confirmed by the visual and SEM analyses. Thus, this study illustrates the practical utility of the solid starch–iodine complex as a safe and efficient means of introducing iodine into an environment, mitigating the typical hazards associated with handling solid iodine.

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Higgs, C. Fred y Hooshang Heshmat. "Characterization of Pelletized MoS2 Powder Particle Detachment Process". Journal of Tribology 123, n.º 3 (30 de marzo de 2000): 455–61. http://dx.doi.org/10.1115/1.1310158.

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A recently postulated concept of friction between solids states that the process exhibits elements of quasi-hydrodynamic lubrication in which the wear particles shed from one or both surfaces form an interface layer acting as a lubricant. Pellets were formed by compacting MoS2 powder. A series of pellet-on disk tests were conducted to intentionally deposit wear particles on to a disk. The purpose of the tests are to aid in characterizing the particle detachment process of the pellet. This process consists of analyzing the transfer film, wear and frictional behavior of the pellet. This work also seeks to show that a MoS2 pellet can transfer a film capable of exhibiting tribological characteristics similar to those of liquid lubricants. For example, some tests were correlated with a dimensionless grouping of variables known as the Sommerfeld Number, to suggest the presence of quasi-hydrodynamic behavior in powder films. The pellet parameters that were analyzed were the particle size, compaction pressure and the effects of external loading during testing. Some of the conclusions arrived at were that smaller compaction pressures yield smaller friction coefficients and greater normal loads placed on pellets help to ensure the proper performance of the lubricating powder films. Data from the wear rate of the pellet and friction coefficient, in addition to the appearance of the wear particles were studied. An interesting feature of the pellet friction is that the longer the rest period in between test runs, the greater the friction values are at the resumption of testing. The present work is part of a continuing series to demonstrate that the process of so-called “dry” friction is not confined to the morphology of the interacting surfaces but that it is also a function of the shear and flow occurring at the interface.

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Zhao, Hongxing, Fengshan Zhou, Cunfa Ma, Zhongjin Wei y Wenjun Long. "Bonding Mechanism and Process Characteristics of Special Polymers Applied in Pelletizing Binders". Coatings 12, n.º 11 (26 de octubre de 2022): 1618. http://dx.doi.org/10.3390/coatings12111618.

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Pellet ore not only has excellent metallurgical and mechanical properties, but is also an important metallurgical raw material used to solve the problem of increasing depletion of global high-grade iron ore resources. Bentonite has long been widely used in pellet ore production, which is not only expensive but also causes serious metallurgical pollution. Organic binders can form stronger adhesion and cohesion with mineral particles inside the green pellets than capillary forces, which greatly improves the pelletizing rate and significantly increases the strength of green and dry pellets, and it becomes an indispensable alternative to bentonite because it volatilizes pyrolytically at high temperatures, leaving almost no inorganic contaminants inside the pellet ore. In order to let more pellet researchers fully understand the research status and pelletizing theory of organic binders, this review systematically summarizes seven common organic binders, and elaborates on their adhesion mechanism and process characteristics, so as to provide references for pellet researchers and readers to further prepare cost-effective pellet binders and improve advanced pelletizing technology.

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Lim, Kean Pah, Han Ming Albert Gan, Soo Kien Chen, Zainal Abdib Talib, S. A. Halim, Siau Wei Ng y Hui Wei Chin. "Lattice Strain Effect in Structural, Magnetoresistance and Electrical Properties of La_0.67Sr_0.33MnO₃ Bulk and Thin Film System". Materials Science Forum 846 (marzo de 2016): 635–40. http://dx.doi.org/10.4028/www.scientific.net/msf.846.635.

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Polycrystalline La0.67Sr0.33MnO3 (LSMO) powder prepared via conventional solid state reaction was pressed into pellet form. The pellets became target to growth thin films on corning glass (LSMO-C), fused silica (LSMO-FS) and MgO (100) (LSMO-M) substrate via pulsed laser deposition (PLD) method. XRD results showed that all samples were hexagonal structure with R-3C space group. Thin films showed relatively smaller crystallite size compared to bulk samples. From Rietveld Refinement analysis, all thin films experienced lattice strain when deposited on different substrate. LSMO compound deposited in different substrate induced structure distortion and lattice strain. Compression along c-axis occurred when the lattice strain increased thus shifted the metal-insulator transition temperature to lower temperature and increased its resistivity.

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Wang, Li Ge, Rang Wei Tang, Long Zhou y En Ze Wang. "Study on Compound Modification of Sodium Silicate". Advanced Materials Research 557-559 (julio de 2012): 845–49. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.845.

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In this paper, two-component compound modifiers were used to modify sodium silicate, preparing a new type of inorganic-organic composite cold pellet binder consolidation. The dispersion of its formative adhesive films is good and the bonding ability is also high. By changing modifier ratio and addition, the information of pellet structure and composition was studied. The results showed that: when the compound modifier-component mass ratio is 1:1, adding the amount is 2%, the modified adhesive bond strength is higher, the production of pellets using compression strength up to 2.75KN / a, meeting the needs of blast furnace smelting.

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Mandić, Vilko, Arijeta Bafti, Luka Pavić, Ivana Panžić, Stanislav Kurajica, Jakov-Stjepan Pavelić, Zhen Shi, Katarina Mužina y Ivana Katarina Ivković. "Humidity Sensing Ceria Thin-Films". Nanomaterials 12, n.º 3 (2 de febrero de 2022): 521. http://dx.doi.org/10.3390/nano12030521.

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Lowering the constitutive domains of semiconducting oxides to the nano-range has recently opened up the possibility of added benefit in the research area of sensing materials, in terms both of greater specific surface area and pore volume. Among such nanomaterials, ceria has attracted much attention; therefore, we chemically derived homogeneous ceria nanoparticle slurries. One set of samples was tape-casted onto a conducting glass substrate to form thin-films of various thicknesses, thereby avoiding demanding reaction conditions typical of physical depositions, while the other was pressed into pellets. Structural and microstructural features, along with electrical properties and derivative humidity-sensing performance of ceria thin-films and powders pressed into pellets, were studied in detail. Particular attention was given to solid-state impedance spectroscopy (SS-IS), under controlled relative humidity (RH) from 30%–85%, in a wide temperature and frequency range. Moreover, for the thin-film setup, measurements were performed in surface-mode and cross-section-mode. From the results, we extrapolated the influence of composition on relative humidity, the role of configuration and thin-film thickness on electrical properties, and derivative humidity-sensing performance. The structural analysis and depth profiling both point to monophasic crystalline ceria. Microstructure analysis reveals slightly agglomerated spherical particles and thin-films with low surface roughness. Under controlled humidity, the shape of the conductivity spectrum stays the same along with an increase in RH, and a notable shift to higher conductivity values. The relaxation is slow, as the thickness of the pellet slows the return of conductivity values. The increase in humidity has a positive effect on the overall DC conductivity, similar to the temperature effect for semiconducting behavior. As for the surface measurement setup, the thin-film thickness impacts the shape of the spectra and electrical processes. The surface measurement setup turns out to be more sensitive to relative humidity changes, emphasized with higher RH, along with an increase in thin-film thickness. The moisture directly affects the conductivity spectra in the dispersion part, i.e., on the localized short-range charge carriers. Moisture sensitivity is a reversible process for thin-film samples, in contrast to pellet form samples.

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Onori, S., F. D'Errico, C. De Angelis, E. Egger, P. Fattibene y I. Janovsky. "Proton response of alanine based pellets and films". Applied Radiation and Isotopes 47, n.º 11-12 (noviembre de 1996): 1201–4. http://dx.doi.org/10.1016/s0969-8043(96)00211-4.

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Matsubara, Masaki, Tetsu Yonezawa, Takato Minoshima, Hiroki Tsukamoto, Yingqiong Yong, Yohei Ishida, Mai Thanh Nguyen, Hiroki Tanaka, Kazuki Okamoto y Takuya Osaka. "Proton-assisted low-temperature sintering of Cu fine particles stabilized by a proton-initiating degradable polymer". RSC Advances 5, n.º 124 (2015): 102904–10. http://dx.doi.org/10.1039/c5ra21402e.

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Journal, Baghdad Science. "Comparative NO2 Sensing Characteristics of SnO2:WO3 Thin Film Against Bulk and Investigation of Optical Properties of the Thin Film". Baghdad Science Journal 15, n.º 2 (4 de junio de 2018): 227–33. http://dx.doi.org/10.21123/bsj.15.2.227-233.

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A comparative investigation of gas sensing properties of SnO2 doped with WO3 based on thin film and bulk forms was achieved. Thin films were deposited by thermal evaporation technique on glass substrates. Bulk sensors in the shape of pellets were prepared by pressing SnO2:WO3 powder. The polycrystalline nature of the obtained films with tetragonal structure was confirmed by X-ray diffraction. The calculated crystalline size was 52.43 nm. Thickness of the prepared films was found 134 nm. The optical characteristics of the thin films were studied by using UV-VIS Spectrophotometer in the wavelength range 200 nm to 1100 nm, the energy band gap, extinction coefficient and refractive index of the thin film were 2.5 eV , 0.024 and 2.51, respectively. Hall measurements confirmed that the films are n-type. The NO2 sensing characteristics of the SnO2:WO3 sensors were studied with various temperatures and NO2 gas concentrations. Both thin film and bulk sensors showed maximum sensitivity at temperature of 250 oC. Thin film sensors showed enhanced response in comparison to that of pellets.

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MARX, DAVID T. y NAUSHAD ALI. "FABRICATION AND CHARACTERIZATION OF SUPERCONDUCTING (BI,PB)-SR-CA-CU-O THICK FILMS ON SR-CA-CU-O SUBSTRATES". International Journal of Modern Physics B 07, n.º 01n03 (enero de 1993): 147–50. http://dx.doi.org/10.1142/s0217979293000330.

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We have used a new technique to prepare thick films (about 1 µm) of the Bi(Pb)-based hightemperature superconductors. The method begins by standard powder synthesis of the substrateusing strontium and calcium carbonates and copper oxide in the nominal ratio 3:3:4. Pb may beintroduced into the sample by adding lead oxide. The material is fired in air to 975°C for 24 hourswith one intermediate grinding and pressing of pellets. Bi metal is evaporated onto the surface ofthe pellet. Patterning may be easily accomplished using metal masking. The film is then heattreated in air. Subsequent characterization using resistivity, dc magnetization, x-ray diffraction,and scanning electron microscopy has been performed.

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Tesis sobre el tema "Pellets and films"

Gilligan, Claire A. "Controlled release polymeric films and pellets". Thesis, Queen's University Belfast, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336028.

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Larsen, Crilles Casper. "Process control and evaluation of aqueous latex film coating of pellets in fluidised bed /". Cph. : The Danish University of Pharmaceutical Sciences, department of Pharmaceutics, 2004. http://www.dfh.dk/phd/defences/crillescasperlarsen.htm.

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Moret, Mona P. "Optical properties and structural characterization of ceramic crystals, pellets, and laser-ablation-deposited thin films". Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063604/.

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Pick-Katolik, Jan Paul. "Film-coated and soft pellets : formulation, compaction and the in-situ determination of the properties of films, using dynamic mechanical analysis". Thesis, University of Sunderland, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.446261.

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Vicente, Fábio Simões de. "Comportamento óptico estrutural da zircônia dopada com Er3+,Pr3+ e estabilizante de fase Y3+". Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14112007-093018/.

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O objetivo deste trabalho é a produção e caracterização de filmes finos de Zircônia (ZrO2) dopada com íons terras raras Er3+, Pr3+ estabilizante de fase y3+. Os filmes foram produzidos por evaporação térmica através de canhão de elétrons (EB-PVD) em um sistema não comercial de evaporação desenvolvido em nosso laboratório, onde conseguimos produzir de maneira eficiente e com boa qualidade filmes de até 7,0 pm de espessura. Além da Zircônia na forma de filmes finos, investigamos também pastilhas policristalinas e fibras monocristalinas de ZrO2 fazendo um estudo em paralelo do material nos três grupos de amostras, observando os efeitos estruturais e de luminescência em relação a configuração (monocristalina ou policristalina) de cada amostra. As pastilhas de Zircônia dopada foram produzidas por prensagem e sinterização dos pós dos componentes óxidos metálicos com a finalidade de serem evaporadas por canhão de elétrons para a produção dos filmes, e verificamos intensa luminescência nestas amostras quando excitadas por Laser. As fibras monocristalinas foram produzidas pela técnica de LHPG (Laser Heated Pedestal Growth) onde obtém-se um monocristal de Zircônia pela fusão a Laser de CO2, da cerâmica na forma de bastões. Como pouca informação sobre filmes finos de Zircônia dopada com Terras Raras foi reportada até agora, nossa atenção fica voltada sobre a caracterização do material através de microscopia eletrônica e difração de Raio-X como também medidas de luminescência.
The aim of this work is the production and characterization of Rare Earth Stabilized Zirconia (RESZ) and Rare Earth Yttria Stabilized Zirconia (RE-YSZ) thin films. Thin films were produced by Electron Beam Gun (EB-PVD) in a non commercial evaporation system developed in our laboratory, where we have efficiently produced good Zirconia thin films up to 7.0 pm in thickness. Doped Zirconia pellets and single crystal fibers were investigated in a parallel study with the thin films and the luminescent and structural behavior of these materials have been analyzed. The pellets were produced by pressing and sintering the mixed oxides powders and it was used as evaporation source for thin film production in the electron beam gun, and intense luminescence was observed in these samples when excited by Laser. The single crystal fibers were obtained by Laser Heated Pedestal Growth (LKPG) method, using ceramic extruded rods that were fused by C02 Laser. As few information on Rare Earth Doped Zirconia thin films were reported, we have focused our attention on the structural characterization through electron microscopy and X-Ray diffraction as also luminescence.

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Al-Ahmadi, Ahmad Aziz. "Fabrication and characterization of ZnO film by spray pyrolysis and ZnO polycrystalline sintered pellets doped with rear earth ions". Ohio : Ohio University, 2003. http://www.ohiolink.edu/etd/view.cgi?ohiou1175017625.

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Martinez, Teran Maria Esther. "Development and evaluation of controlled release pellets in orodispersible tablets for pediatric use". Thesis, Lille 2, 2016. http://www.theses.fr/2016LIL2S051/document.

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Dans la dernière décennie, les autorités de santé ont promulgué une réglementation pédiatrique orientée sur le développement et la disponibilité des formulations adaptées à l'âge, la taille, l'état physiologique et les besoins de la population pédiatrique. Généralement, l'administration de médicaments par la voie orale est toujours préférée aux autres voies d'administration car elle est pratique, économique et bien acceptée. Au cours des dernières années, de nouvelles formulations solides ont été développés comme par exemple les comprimés orodispersibles car ils sont faciles à administrer, ne nécessitent pas d'eau et, dès lors que la dispersion est rapide, la biodisponibilité du médicament peut être significativement supérieure à celle observée avec les comprimés classiques offrant ainsi des solutions alternatives pour les enfants. D’autre part, les mini-granules présentent de nombreux avantages par rapport aux formes galéniques solides unitaires car ils se dispersent à travers le tractus gastro-intestinal, réduisant ainsi l'irritation locale du principe actif, et permettent l'amélioration de l'absorption du médicament ainsi que la diminution des fluctuations de concentration plasmatique. De plus, avec ces formes multiparticulaires, il est possible de contrôler la vitesse de libération du médicament, ce qui réduit les effets indésirables. Quelques études ont porté sur la compression des mini-granules non enrobés, ce qui pourraient limiter les problèmes pendant la compression comparativement aux mini-granules enrobés pour lesquels l’enrobage pourrait être détruit.L'objectif global de ce travail était de développer un comprimé multiparticulaire orodispersible (MUP-ODT) qui permet la libération contrôlée d'acétaminophène (APAP), utilisé comme principe actif modèle, contenue dans les mini-granules des comprimés orodispersibles.La première partie a déterminé les propriétés mécaniques des mini-granules d’APAP obtenus par la technique d’extrusion-sphéronisation en contenant différents types d'excipients et différents pourcentages de principe actif pour produire un système matriciel à libération contrôlée.La seconde partie de cette étude a examiné la faisabilité de comprimer des mini-granules non enrobés à base de cellulose microcristalline (MCC) dans différentes formulations orodispersibles et d’étudier l'influence du pourcentage de mini-granules, le type de désagrégant et la force de compression.La troisième partie a été dédiée à la production des MUP-ODTs qui permettent la libération contrôlée d’APAP en utilisant différents pourcentages d’Eudragit® pour créer un système matriciel sans changement significatif dans le profil de libération après la compression.Enfin, dans la dernière partie, un plan d'expérience a été effectué pour déterminer les paramètres optimaux pour produire les MUP-ODTs. L'évaluation du masquage de goût a été réalisée par la langue électronique et la méthode de dissolution à l'aide d'une pompe à seringues qui utilise de fiables volumes de milieu afin de simuler le comportement dans la bouche d’un enfant. Plusieurs polymères ont été utilisés avec succès pour produire des mini-granules d’APAP de type matriciel avec différents pourcentages de principe actif. Les MUP-ODTs ont été obtenus en montrant la faisabilité de leur production et l’obtention de bonnes propriétés mécaniques. Ils permettent la désagrégation très rapide et la possibilité de libération modifiée, tout en offrant une déglutition facile pour un enfant et une flexibilité de posologie
In the last decade, medical agencies have promoted a pediatric regulatory focusing on the development and availability of age-appropriate formulations suitable for age, size, physiological condition and treatment requirements for the pediatric population. In general, oral drug delivery is still preferred over the other drug delivery routes since it is convenient, economical and user friendly. In recent years, a number of new solid oral drug delivery platforms such as orodispersible tablets have been developed as they are easy to administer, do not require additional water and, as long as dispersion is rapid, the bioavailability of the drug can be significantly greater than those observed in conventional tablet dosage forms offering a potential alternative for pediatric patients. In parallel, multiparticulate products present many advantages compared to single-unit dosage forms as they distribute fast through the gastrointestinal tract, thus reducing local irritation caused by the active ingredient, enhancing drug absorption and decreasing fluctuation of plasma peaks. Moreover, it is possible to control the drug release rate, resulting in fewer adverse effects. Only few studies have dealt with the compaction of uncoated pellets, which potentially could provide fewer problems during compaction than coated pellets, in particular by reducing damages on the coating.The overall objective of this study was to develop a Multiple-Unit Pellet Orodispersible Tablet (MUP-ODT) allowing for the controlled release of acetaminophen (APAP), used as a model drug, which is contained in the pellets of the orodispersible tablets.The first part determined the mechanical properties of APAP pellets produced by the extrusion-spheronization technique containing different types of excipients and different drug load percentages to produce a controlled release matrix system.The second part of this study examined the feasibility to compress uncoated free drug MCC pellets with different orodispersible formulations to assess the influence of the percentage of pellets, type of disintegrants and compression force.The third part was dedicated to produce MUP-ODTs which allowing for controlled-release of APAP using different percentages of Eudragit® to create the matrix system without significant changes in the release profile after compression.Finally, a design of experiments was carried out to determinate the optimal parameters to produce MUP-ODTs.Taste-masking evaluation was realized using the electronic tongue. Dissolution test was performed using a syringe pump and small volumes of aqueous medium at low flow rates to mimic the behavior in the mouth of the child.Different polymers were successfully used to produce APAP matrix pellets with different drug loadings. MUP-ODTs were successfully obtained demonstrating their feasible production with good mechanical properties. They enable very fast disintegration and modified release properties, but also offer easy swallowing for children and dose flexibility

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Pöllinger-Tieg, Catherine [Verfasser], K. [Akademischer Betreuer] Mäder, J. [Akademischer Betreuer] Siepmann y J. [Akademischer Betreuer] Kressler. "Development and investigation of Propranolol HCl pellets coated with poly(vinyl acetate) based polymer films for sustained release applications / Catherine Pöllinger-Tieg. Betreuer: K. Mäder ; J. Siepmann ; J. Kressler". Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2012. http://d-nb.info/1029083649/34.

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Maouacine, Koceila. "Matériaux hybrides poreux silice/polymère comme électrolytes pour batterie lithium-ion tout solide". Electronic Thesis or Diss., Aix-Marseille, 2023. http://www.theses.fr/2023AIXM0024.

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La conception de batteries lithium-ion utilisant un électrolyte solide est actuellement l’une des voies les plus étudiées pour s’affranchir des problèmes de sécurité lié à ces dispositifs. Dans ces travaux de thèse, nous proposons une nouvelle approche d'élaboration d'un électrolyte hybride poreux silice/polymère, contenant une fraction massique plus élevée de silice mésoporeuse que de polymère. Deux morphologies de matériaux hybrides de silice ont été étudiées : sous forme de poudres compressées (pastilles) et sous forme de films minces. Dans la première partie du travail, une poudre de silice hybride a été synthétisée puis calcinée pour libérer la porosité. La silice mésoporeuse a, ensuite, été fonctionnalisée par imprégnation en solution avec différents polymères de type PEG de faible poids moléculaire puis, par un sel de lithium, le LiTFSI. Les poudres hybrides ont été compressées sous forme de pastilles, présentant une porosité inter- et intraparticulaire. Il a été montré que, les pastilles hybrides présentent des propriétés de conductivité ionique prometteuse lorsque les porosités inter et intraparticulaires sont remplies par le complexe PEG-LiTFSI pour PEG de faible masse molaire (300-600 g/mol). Dans la seconde partie, des films de silice mésoporeuse ont été déposés sur une électrode de carbone vitreux en utilisant une électrode à disque rotatif (RDE). Après avoir caractérisé ces films du point des propriétés texturales et de la microstructure, ces derniers ont été fonctionnalisés par le complexe PEG-LiTFSI via un procédé d’imprégnation et l’étude préliminaire de leur conductivité ionique a été réalisée
The design of lithium-ion batteries using a solid electrolyte is currently one of the most studied ways to overcome safety problem of these devices. In this thesis work, we propose a new approach to develop a porous silica/polymer hybrid electrolyte, containing a higher weight fraction of mesoporous silica than polymer. Two morphologies of silica hybrid materials were studied: as compressed powders (pellets) and as thin films. In the first part of the work, a hybrid silica powder was synthesized and then calcined to liberate the porosity. The mesoporous silica was then functionalized with different polymers of PEG of low molecular weight then by a simple solution impregnation. The hybrid powders were shaped as pellets, presenting inter- and intra-particle porosity. It was shown that the hybrid pellets present promising ionic conductivity properties when the inter- and intraparticle porosities are filled with the PEG-LiTFSI complex for PEG of low molar mass (300-600 g/mol). In the second part, mesoporous silica films were deposited on a glassy carbon electrode using a rotating disc electrode (RDE). After the characterization of these films from a textural properties and a microstructure point of view, they were functionalized by the PEG-LiTFSI complex via an impregnation process and the preliminary study of their ionic conductivity was performed

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Sousa, Joao Jose Martins Simoes de. "The influence of formulation on the formation of and drug release from film coated pellets". Thesis, University College London (University of London), 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388207.

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Libros sobre el tema "Pellets and films"

Tre film da Le grand Meaulnes. Bari: Edizioni di Pagina, 2014.

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Capítulos de libros sobre el tema "Pellets and films"

Speller, Susannah. "High Temperature Heroics". En A Materials Science Guide to Superconductors, 141–71. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192858344.003.0009.

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Abstract The stage has now been set for tackling the very complex high temperature superconducting materials in this chapter. It begins with an introduction to the chemistry, structure and properties of this large family of superconductors. The idea that grain boundaries must be avoided in these materials has already been introduced, so here the focus is on how wires are processed and how the bulk pellets that are used for levitation and permanent magnet applications are manufactured. HTS thin films for microwave communication devices are also introduced. The concept of flux creep is introduced, and analogies are drawn with dislocation creep in the “Under the Lens” section. The “Wider View” section looks at other materials that need to be processed as single crystals - nickel superalloy turbine blades for jet engines – tying in with the discussion on creep.

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Moritzer, Elmar, Volker Schöppner, Michael Kröker, Claudine Reisdörfer, Johanna Müller, Maike Engelen y David Grewell. "Polymer Processing Principles". En Bioplastics and Biocomposites, 72–101. Royal Society of Chemistry, 2023. http://dx.doi.org/10.1039/bk9781788010085-00072.

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The process selection for plastics manufacturing is primarily driven by the material’s morphology and the size and shape of the final product. Because thermoset plastics do not soften and flow when heated, this type of plastic is typically molded using a casting technique. In contrast, thermoplastics will soften and flow when heated and can be processed and shaped into products using a wide range of processes. These processes include extrusion, injection molding, stretch blow molding, vacuum- or thermoforming, and blown film processing. Most of these processes rely on an extrusion process step that heats and plasticizes (melts) the plastic. Because the thermal conductivity of plastics is typically low, bulk heating of plastics through conduction would extend the processing time. However, plastic pellets fed into an extruder are heated and softened quickly because they are exposed to high shear forces (internal heating mechanism). Once molten, the plastic material can be pressurized and injected into molds or extruded through dies to manufacture a wide range of products.

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"A Lad Indeed: Boyhood Friendship and the Politics of Masculinity in El Bola (“Pellet”) (Achero Mañas, 2000)". En The Politics of Age and Disability in Contemporary Spanish Film, 45–64. Routledge, 2012. http://dx.doi.org/10.4324/9780203098516-9.

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İsmail Tosun, Yildirim. "Apatite/Salt Slurry Emission Control of Post Combustion Flue Gas of Lignite and Coal in Fluidized Bed - Double Circulation Microwave Column Adsorber". En Environmental Change and Sustainability [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.95296.

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Heated Ca apatite slimes in microwave radiated salt slurries are one of the most promising technologies for advanced fuel energy storage with favorable economic potential and intrinsic properties. The development of solid pellet technology for molten salt is a key issue in the heat transport processing. The apathite phosphate, slurry salt in the slime-salt bath mixes was investigated under microwave radiation heating to result in insoluble sorbent fines dissolved in porous basket. The insoluble consists of noble metal fission products, such as Pb, Zn, Cu. In this study, there have been very few transport studies of wet steam alkali slurry (metal fines-molten alkali salt mixture). Bath ferrite/apatite particle size changed the heat conductivity to salt bath. A major reason is that the retention time in fixed film processes is longer than in solid–gas processes. This allows more time to the heat absorption for cracking to the desorbed persistent compounds. Furthermore, radiated ferrite by microwave allows a sufficient intimate contact between coal and biomass surface pores and gas atmosphere in the furnace due to more pyrolysis gas desorption. Bubbling slurry of sorbent porosity decreases while temperature decreases. There was a critical porous structure of bubbling sorbent bath which is a factor that determines to a great extent both the sorbent rate and degree of boiling it was found that, a porous slurry bath over 45% was more efficient with radiated a low amount ferrite below weight rate of 15% in microwave column.

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İsmail Tosun, Yildirim. "Apatite/Salt Slurry Emission Control of Post Combustion Flue Gas of Lignite and Coal in Fluidized Bed - Double Circulation Microwave Column Adsorber". En Environmental Issues and Sustainable Development. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.95296.

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"coating layer itself, an d at the interface between the coating and the substrate, causes instant fracturing and separation of coating material from the surface. In general, if a coating or contaminant is CHEMICALLY bonded to a surface, dry ice particle blasting will NOT effectively remove the coating. If the bond is PHYSICAL o r MECHANICAL in nature, such as a coating of rubber residue which is "anchored" into the porous surface of an aluminum casting, then there is a good chance that dr y ice blasting will work. Contaminants which are etched, or stained into the surfaces of metals, ceramics, plastics, or other materials typically cannot be removed with dry ice blasting. If the surface of the substrate is extremely porous or rough, providing strong mechanical "anchoring" for the contaminant or coating, dr y ice blasting may not be able to remove all of the coating, or the rate of removal may be too slow to allow dry ice blasting to be cost effective. The classic example of a contaminant that does NOT respond to dry ice blast-ing is RUST. Rust is both chemically and strongly mechanically bonded to steel substrate. Advanced stages of rust must be "chiseled" away with abrasive sand blasting. Only the thin film of powderized "flash" rust on a fresh steel surface can be effectively removed with dry ice blasting. 4.2.1.1. Inductio n (venturi) and direct acceleration blast systems - the effect of the typ e of system on available kinetic energy In a two-hose induction (venturi) carbon dioxide blastin g system, the medium particles are moved from the hopper to the "gun" chamber by suction, where they drop to a very low velocity before being induced into the outflow of the nozzle by a large flow volume of compressed air. Some more advanced two-hose systems employ a small positive pressure to the pellet delivery hose. In any type of two-hose system, since the blast medium particles have only a short distance in which to gain momentum and accelerate to the nozzle exit (usually only 200 to 300 mm), the final particle average velocity is limited to between 60 and 120 meters per second. So, in general, two-hose systems, although not so costly, are limited in their ability to deliver contaminant removal kinetic energy to the surface to be cleaned. When more blasting energy is required, these systems must be "boosted" a t the expense of much more air volume required, and higher blast pressure is re-quired as well, with much more nozzle back thrust, and very much more blast noise generated at the nozzle exit plane. The other type of solid carbon dioxide medium blasting system is like the "pressurized pot" abrasive blasting system common in the sand blasting and Plas-ti c Media Blasting industries. These systems use a single delivery hose from the hopper to the "nozzle" applicator in which both the medium particles and the compressed air travel. These systems are more complex and a little more costly than the inductive two-hose systems, but the advantages gained greatly outweigh the extra initial expense. In a single-hose solid carbon dioxide particle blasting system, sometimes referred to as a "direct acceleration " system, the medium is introduced from the hopper into a single, pre-pressurized blast hose through a sealed airlock feeder. The particles begin their acceleration and velocity increase". En Surface Contamination and Cleaning, 162–63. CRC Press, 2003. http://dx.doi.org/10.1201/9789047403289-25.

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Actas de conferencias sobre el tema "Pellets and films"

Zhang, Dongpu, Wei Xue y Zhinong Yu. "BaAl2S4:Eu thin films sputtered by complex target with spark plasma sintering BaS:Eu pellets". En Photonics Asia, editado por Yanbing Hou y Bin Hu. SPIE, 2012. http://dx.doi.org/10.1117/12.2001136.

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Dougherty, Patrick S. M., Cecily M. Sunday y C. Fred Higgs. "Adaptive Solid Lubricant Transfer Films for Conductivity and Oxidation Control". En ASME/STLE 2012 International Joint Tribology Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/ijtc2012-61157.

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The success of solid lubricants to exhibit ultra-low friction and wear behaviors in oil-prohibiting environments, has led to a major effort to optimize their performance and enhance their applicability. Depending on the operating conditions, solid lubricants may take on a plethora of forms including fabricated composite coatings, thick-film powder lubricants, nano-particle additives for hard surfaces or liquid lubricants, and self-replenishing transfer films. One of the benefits of transfer films are their freedom from the complex deposition techniques required for most other solid lubricant systems. In this work, the potential for adaptive self-replenishing transfer films was explored by creating composite powders of well-known powder lubricants and electrically conductive or anti-oxidation materials. MoS2, WS2, and Graphite Powders were mixed in varying composition with Cu, Sb2O3, and BO3 additives and compacted to form “tuned” or adaptive powder pellets. Relationships between friction, wear, electrical resistance, tribo-induced oxidation and powder composition, will be presented in order to investigate the potential of composite property optimization for lubricious, highly conductive, and oxidation resistant transfer films.

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Pimentel, Joao Vitor, Manuel Evaristo, Tomas Polcar y Albano Cavaleiro. "Self-lubricating W-S-C-Cr tribological coatings deposited by r.f. magnetron sputtering". En 13th International Conference on Plasma Surface Engineering September 10 - 14, 2012, in Garmisch-Partenkirchen, Germany. Linköping University Electronic Press, 2013. http://dx.doi.org/10.3384/wcc2.283-286.

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Tribological coatings composed of transition metal dichalcogenides (TMD) have long been studied for their excellent self-lubricant properties. However, they exhibit low load-bearing capacity, and their performance tends to deteriorate significantly in the presence of humidity. In previous works, doping disulfides and diselenides of tungsten and molybdenum has proven to be a way of greatly improving the tribological performance of this class of films in different environments. In this work, thin films were deposited by r.f. magnetron sputtering on silicon and steel samples, using two targets (carbon and chromium) and tungsten disulfide pellets. The final composition was controlled by the number of WS2 pellets and the ratio of the power applied to the targets. The carbon content was fixed at approximately 40 at.% in all depositions. The chromium content in the coatings was varied in the range 0 – 13.5 at.% and the S/W ratio was approximately 1.25 in all compositions in the series. The coatings were characterized in regard to their hardness, adhesion, chemical composition and bonding, microstructure and morphology, as well as their tribological behaviour.

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Pudjoprawoto, R., P. Dougherty y C. F. Higgs. "A Volumetric Fractional Coverage Model to the Predict Frictional Behavior for In Situ Solid Transfer Film Lubrication". En ASME/STLE 2011 International Joint Tribology Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ijtc2011-61277.

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Pellets were formed by compacting MoS2 powder. In the setup, the pellet is sheared against a disk surface while the slider pad rides on the MoS2 partially-covered asperities, while depleting the lubricant. A volumetric fractional coverage (VFC) modeling approach was developed to predict the friction coefficients for the lubricated pellet/disk sliding contact by assuming that the friction coefficients at pellet/disk and slider/disk interfaces are functions of the fraction of lubricant occupying the control volume. This fractional coverage is a theoretical parameter for quantifying the amount of third body film covering the disk asperities as a function of time. The model can be applied to a deterministic surface, thus, the proposed theory can predict the behavior of friction coefficients between the pellet/disk and slider/disk interfaces for most topographies, whether they are deterministic (i.e., textured) or real (i.e., random).

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McCall, R. P., J. M. Ginder, J. M. Leng, H. J. Ye, Arthur J. Epstein, W. E. Farneth, E. M. McCarron y S. I. Shah. "Photoinduced absorption spectroscopy as a probe of electronic states in high Tc material systems". En OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1989. http://dx.doi.org/10.1364/oam.1989.ws1.

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Optical and infrared absorption and photoinduced absorption studies of the high T c families of materials give insight into the types of charged excitation existing in these materials, as well as the nature of their ground states and mechanisms for superconductivity. Near steady state photoinduced optical absorption spectra on thin films and pressed KBr pellets of YBa2- CU3O7-δ for δ ~ 0.7 show two absorption peaks below ~1.5 eV and a crossover to photoinduced bleaching at higher energies. Photoinduced infrared spectra reveal several absorption and bleaching modes and a broad electronic transition centered at ~1000 cm-1. The photoinduced bleaching modes correspond to direct absorption modes of the semiconducting YBa2Cu3O6.3 material. The photoinduced absorption modes correspond to direct absorption modes of the superconducting YBa2Cu3O7 material. The presence of the photoinduced IR modes and the higher lying absorptions and bleachings shows that long-lived, stable electronic defect states lying within the energy gap are created.

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Burmen, Miran, Miha Mozina, Franjo Pernus y Bostjan Likar. "Coating film thickness of pharmaceutical pellets measured by near infrared spectroscopy". En 2010 IEEE International Conference on Industrial Technology (ICIT 2010). IEEE, 2010. http://dx.doi.org/10.1109/icit.2010.5472679.

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Ma, X., S. Ge, T. Zhang y Y. Zhang. "Property Evaluation of HVOF-Sprayed Magnetic Thick Films". En ITSC2003, editado por Basil R. Marple y Christian Moreau. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.itsc2003p0841.

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Abstract Spinel soft ferrites such as NiZnFe2O4 are of great interest due to their extensive applications in magnetic-optics, microelectronics, and microwave devices. This study deals with the production of thick Ni0.5Zn0.5Fe2O4 magnetic films (>50 microns) using high velocity oxy-fuel (“HVOF”) thermal spray. With the HVOF process, high density films more than 98% theoretical density were prepared, apparently due to the high velocity of droplets in the process. The influence of the fuel composition on coating structure, deposition efficiency, and magnetic properties of the Ni-Zn ferrite films was investigated. Better magnetic properties were obtained in the as-sprayed film formed with a neutral or oxygen-rich flame. The decomposition of the ferrite material occurred with a fuel-rich flame and resulted in a reduction in magnetic properties. However, the magnetic properties could be improved dramatically after heat treatment. Pellet and toroid samples of these films were produced for evaluation of magnetic properties by saturation magnetization and magnetic permeability. The permeability exhibited a very flat response to high frequencies up to 13 MHz.

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Lee, G. S., H. S. Jeon, A. R. Lee, J. E. Ok, D. W. Cho, K. H. Kim, M. Yang et al. "Fabrication of CIGS thin film by mixed-source pellet". En PHYSICS OF SEMICONDUCTORS: 30th International Conference on the Physics of Semiconductors. AIP, 2011. http://dx.doi.org/10.1063/1.3666687.

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Chao, Guo, Deng Jian, Cai Rong, Ma Yugao, Liu Lili, Zhang Yuhao y Lv Siyu. "Preliminary Development on Thermal-Hydraulic Analysis Code for the Spent Fuel Rod Under the Condition of Spray Cooling". En 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16798.

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Abstract According to spray cooling characteristics for failure of the cooling system in the spent fuel pool, we establish a model for analyzing spray cooling of a single spent fuel rod and develop a code named SFSC which is used to calculate the thermal-hydraulic characteristics of film on the spent fuel rod under the condition of spray cooling. The results obtained from SFSC consist of film thickness, film temperature, film evaporation, fuel pellet temperature of spent fuel rod and cladding temperature of spent fuel rod at different height of spent fuel rod are shown in this paper. At the same time, we establish same model by RELAP and compare results calculated by RELAP with that calculated by SFSC. The good agreement of two results demonstrates that SFSC is effective. SFSC fills in the blanks of thermal-hydraulic calculation for the spent fuel rod under the condition of spray cooling.

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Wornyoh, E. Y. A. y C. F. Higgs. "An Asperity-Based Fractional Coverage Model for Solid Lubricant Film Transfer on a 3D Surface". En ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44489.

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Topography data was obtained from an aluminum thin film deposited unto a substrate. Using this 20 μm × 20 μm specimen, an asperity-based fractional coverage model was used to predict (1) the friction coefficient at a pad/disk interface (2) the thickness of deposited lubricant film and (3) the wear factor for a compacted lubricant pellet in sliding contact. The fractional coverage varies with time and is a useful modeling parameter for quantifying the amount of third body film covering the disk asperities. The model was based on a previous 1-D control volume fractional coverage model which was used to glean tribological parameters including friction coefficient and wear factor. In this model, the wear rate of the pellet, pad friction coefficient, and lubricant thickness can be determined as a function of the pellet load, slider pad load, disk speed, and material properties. Steady-state results from the model adequately predict the self-repairing and self-replenishing nature of powder lubrication as a function of topography.

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Informes sobre el tema "Pellets and films"

Krieger, Frank C. y Michael S. Ding. Gas Control and Thermal Modeling Methods for Pressed Pellet and Fast Rise Thin-Film Thermal Batteries. Fort Belvoir, VA: Defense Technical Information Center, septiembre de 2015. http://dx.doi.org/10.21236/ada622256.

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