Academic literature on the topic 'Silicone-based Compound'
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Journal articles on the topic "Silicone-based Compound"
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Yin, Shao Hui, Zhen Yong Cheng, Zhi Qiang Xu, Feng Jun Chen, and Jian Wu Yu. "Experimental Study on Polishing Properties of Silicone Oil Based Magnetic Compound Fluid." Advanced Materials Research 565 (September 2012): 273–77. http://dx.doi.org/10.4028/www.scientific.net/amr.565.273.
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Silicone oil based magnetic compound fluid was prepared to polishing stainless steel in this paper. The new fluid consists of nano-sized magnetite particle, micro-sized diamonds, micro-sized iron particle and α-cellulose. The characteristics of the fluid were analyzed. The length and quality of the magnetic cluster in the compound fluid was observed under a magnetic field. Polishing experiment of stainless steel was conducted using the silicone oil based magnetic compound fluid on an inclined polishing finishing device. The micro morphology of the stainless steel’s surface was measured. The results showed the surface quality was improved remarkably and the final roughness of the surface was Ra (Average roughness) 0.020μm.
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Ibrahim, W. M. A., and S. Y. Kuek. "Compressive Strength of Rice Husk Filled Resin." Advanced Materials Research 264-265 (June 2011): 576–79. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.576.
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The findings for strengthening and repair of implant materials are stepping up to ensure better protection of the patients. The utilization of composite resin is favourable to combat this challenge. However, it being a brittle material does not entitle it to be used in the design. Hence, epoxy resin combining with silicon oxide filler from the rice husk; is a relatively new material in biomedical engineering, enable it to meet its fullest strength and flexibility. Work was performed at laboratory to extract the silicone compound from rice husk and as well investigate the compressive strength of rice husk filled resin material. Initially the rice husk was experimented by undergoing pre-treatment, chemical treatment and incineration process to obtain silicone compound. The silicone compound was later mixed with epoxy resin at different percentage of filler. In the final stage, the compressive strength of rice husk filled resin was analyzed and affirmed experimentally based on the ASTM standards. The results obtained were then analyzed using analytical software SPSS. Epoxy resin filled with 20% silica from rice husk gave the optimum compressive strength of 90 Mpa.
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Nituica (Vilsan), Mihaela, Maria Sonmez, Mihai Georgescu, Maria Daniela Stelescu, Laurentia Alexandrescu, Dana Gurau, Carmen Curutiu, and Lia Maria Ditu. "Antibacterial Compound based on Silicone Rubber and ZnO and TiO2 Nanoparticles for the Food and Pharmaceutic Industries. Part II - Biological and Morphological Characterization." Leather and Footwear Journal 20, no. 3 (September 30, 2020): 237–44. http://dx.doi.org/10.24264/lfj.20.3.3.
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The aim of this paper is the biological and morphological characterization of an antibacterial compound based on silicone rubber (Elastosil R701/70-OH), reinforced with ZnO and TiO2 nanopowders (with antibacterial, antifungal and antimicrobial properties), charged (chalk), crosslinked with peroxide (dicumyl peroxide - powder 40% with calcium carbonate and silica, specific to the food, pharmaceutical, but also medical field). ZnO and TiO2 nanopowders, by their homogeneous dispersion in the mass of the compound, have a determined role on its antibacterial and antimicrobial sterilization properties. The mixture of antibacterial compound based on silicone rubber was made on a laboratory roller, provided with cooling, in the form of a sheet (maximum thickness 5 mm), in strict compliance with the technological recipe and the established mode of operation. Subsequently, the mixture is processed into forming molds at predetermined parameters by determining the vulcanization time using the Monsanto rheometer (to determine the optimum temperature and vulcanization times), but also the biological and morphological characterization, according to current standards in specific food and pharmaceutical environments.
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Shchegolkov, A. V. "The comparative analysis of thermal effects in elastomers modified with MCNT at constant DC voltage." Vektor nauki Tol'yattinskogo gosudarstvennogo universiteta, no. 1 (2021): 63–73. http://dx.doi.org/10.18323/2073-5073-2021-1-63-73.
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The author carried out the comparative analysis of elastomers – polyurethane (NPC) and silicone compound (NCOC) modified with carbon nanotubes (MCNT) with a mass content of 1 to 9 %. MCNTs were synthetically produced by the CVD technology using Co-Mo/Al2O3-MgO (MCNT1) and Fe-Co/2,1Al2O3 (MCNT2) catalysts. The analysis of experimental study results showed that the lowest specific bulk electrical conductivity (5×10-10 Cm×cm-1) was typical for polyurethane elastomer (1 mass. % MCNT synthetically produced using Fe-Co/2,1Al2O3 catalyst). For the silicone elastomer modified with 9 mass. % MCNT1, the specific bulk electrical conductivity was 4×10-1 Cm×cm-1. The author identified the parameters of percolation of electrical conductivity model for NPC, NCOC with MCNT1 and MCNT2, taking into account the MCNT packing factor and electrical conductivity critical index. The maximum temperature field uniformity is typical for silicone elastomer with 7 mass. % MCNT2. Nonuniform temperature field in modified polyurethane-based elastomers can be caused by the local MCNT entanglement manifested in the creation of agglomerates or more dense electrically-conductive circuit packing, which, in its turn, results in the decrease in heat power. The heating temperature of nanomodified composites produced from NCOC 1 and NCOC 2 can vary from 32.9 to 102 °С. The author studied the modes of nanomodified elastomers heat generation in the range of 6 to 30 V, compared heat generation in the elastomer-based and ceramics-based samples. The study allowed identifying the best combination of the polymeric matrix and MCNT type. For the electric heater, it is the most efficient to apply silicone compound at the 7 % MCNT concentration and, depending on the feeding voltage level of 12 or 24 V, to use MCNT1 or MCNT2.
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Shao, Yue, Yu-chou Shih, and Frank G. Shi. "Reliability potential of silicone molding compounds for LED application." International Symposium on Microelectronics 2014, no. 1 (October 1, 2014): 000258–61. http://dx.doi.org/10.4071/isom-tp34.
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As the development of light emitting devices (LEDs), integrate circuits (ICs) and concentration photovoltaic (CPV) modules towards higher density, packaging materials are facing the challenges of withstand with heat generation and high energy. Epoxy molding compound (EMC) is the latest technology for LED and solar cell package to replace PPA and PCT. However, it is well known that the thermal and radiation resistance of epoxy is limited. Recently, silicone based composites are attracting attention as ideal materials because they are insensible to high energy density and good resistance to UV light and heat. Epoxy and silicone both have reliability issues during long-term service at high temperature and high energy. Thermal and radiation degradation of reflector materials will largely affect their reflectance and their contribution to a higher light output and energy efficiency. Therefore, it is very essential to evaluate reliability performance of SMC and EMC based reflecting materials. Aging under multiple environmental conditions has generated considerable interest for evaluating the life and behavior of materials in a real environment. Radiation and thermal aging are two quite different types of aging. The combination of these two situations will cause the aging process to accelerate further. The objective of this study is to investigate the synergetic influence of thermal and radiation aging on optical performance of SMC and EMC based packaging materials. It is concluded that SMC is the preferred choice for packaging LEDs, ICs and solar cells for its superior thermal and radiation resistance.
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Yu, Jibo, Elfed Lewis, Gilberto Brambilla, and Pengfei Wang. "Temperature Sensing Performance of Microsphere Resonators." Sensors 18, no. 8 (August 1, 2018): 2515. http://dx.doi.org/10.3390/s18082515.
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In recent years, many temperature sensing devices based on microsphere resonators have emerged, attracting an increasing research interest. For the purpose of this review article, microsphere resonators are divided according to their constituting materials, namely silicone, silica, compound glass, and liquid droplet. Temperature monitoring relies mainly on the thermo-optic/thermal expansion of the microspheres and on the fluorescence of the doped ions. This article presents a comprehensive review of the current state of the art of microsphere based temperature sensing and gives an indication of future directions.
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AGASSI, EYAL, AYALA RONEN, NIR SHILOAH, and EITAN HIRSCH. "DISCRIMINATION BETWEEN NATURAL DENSE DUST CLOUDS WITH IR SPECTRAL MEASUREMENTS." International Journal of High Speed Electronics and Systems 18, no. 03 (September 2008): 647–60. http://dx.doi.org/10.1142/s0129156408005643.
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Heavy loads of aerosols in the air have considerable health effects in individuals who suffer from chronic breathing difficulties. This problem is more acute in the Middle-East, where dust storms in winter and spring transverse from the neighboring deserts into dense populated areas. Discrimination between the dust types and association with their source can assist in assessment of the expected health effects. A method is introduced to characterize the properties of dense dust clouds with passive IR spectral measurements. First, we introduce a model based on the solution of the appropriate radiative transfer equations. Model predictions are presented and discussed. Actual field measurements of silicone-oil aerosol clouds with an IR spectro-radiometer are analyzed and compared with the theoretical model predictions. Silicone-oil aerosol clouds have been used instead of dust in our research, since they are composed of one compound in the form of spherical droplets and their release is easily controlled and repetitive. Both the theoretical model and the experimental results clearly show that discrimination between different dust types using IR spectral measurements is feasible. The dependence of this technique on measurement conditions, its limitations, and the future work needed for its practical application of this technique is discussed.
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Nasir, H. M., T. A. Saki, and M. Y. Al-Luaibi. "Synthesis, identification and thermal study of some new inorganic polymers based on bis-dithiocarbamate ligands with silicone, tellurium and some transition metals." Innovaciencia Facultad de Ciencias Exactas Físicas y Naturales 7, no. 1 (October 25, 2019): 1–13. http://dx.doi.org/10.15649/2346075x.507.
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Introduction: In recent years, there has been considerable interest in dithiocarbamate complexes because of its diverse biological roles, very few reports have been made on polymeric bis- dithiocarbamate compounds with carbon chain of n-propyl or hexamethelene with transition metals in addition of the absence of any report of organosilicone or tellurium halides with such compounds Our interest in this report based on the preparation of new series of polymers with an expected activity as a fungi side compounds followed by the using of prepared amino compound as a hardners for epoxy paints Materials and Methods: A new polymers of the general structures –(MS2CNH(CH2)6NHCS2M-)n where [M= Cu, Cd, Mn and Zn] and –(M(R)2S2CNH(CH2)nNHCS2MR2-)m where [M= Si,R=CH 3 , n= 2 ,3 and 6 ; M=Te , R= Br , n= 2 ,3 and 6 ; M=Co, Ni R=Cl ; n= 6] have been prepared by reaction of MX2 where M= Ni ,Co, Cd , Mnor Zn , X= Cl ; M=Cu , X= SO4 , and dimethyl dichloro silane, tellurium tetrabromide with the corresponding sodium salts of bis-dithiocarbamateligands. Results and Discussion: Dimethyldichloro silane is a very sensitive material to O-H group, in addition to that, TeBr4 decomposed rapidlyin water so, a series solvents may be useful with such sensitive chemicals to water , in the other hand, dithiocarbamate ligands which is usually prepared in aqueous and alcoholic solution , must be prepared and isolated carefully to apply the other steps of synthesis using a chloroform solution as a solvent. It seems for the first view for dithiocarbamato ligands it may act as a bi dentate ligands using two sulphur donating atoms that is clearly appeared in common complexes such as diethyl dithiocarbamato or pipyridyl, morpholino dithiocarbamato with representation metal elements, even in such type of elements a sulfur bridges may formed. In this study, it showed clearly that Zinc and Cadimium polymers are diamagnetic polymers that is mean that these polymers are with oxidation state equal to (II) and a tetrahedral configuration Conclusions: The study showed that the new silicone polymers act as a stable polymers compared with others. All new polymers are of a high stability with large values of char contain with commercial epoxy. Among silicone polymers, the polymerwith carbon chain equal to 3 is more stable than that with 2 carbon atoms while the silicone polymer with 6 carbon atoms is the less stable one, may thermal treatment caused decomposition combined.
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Xue, Xinzhi, and Joseph Katz. "Formation of compound droplets during fragmentation of turbulent buoyant oil jet in water." Journal of Fluid Mechanics 878 (September 4, 2019): 98–112. http://dx.doi.org/10.1017/jfm.2019.645.
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Fragmentation of a vertical buoyant silicone oil jet injected into sugar water is elucidated by refractive index matching and planar laser-induced fluorescence. Compound droplets containing multiple water droplets, some with smaller oil droplets, form regularly at jet Reynolds numbers of $Re=1358$ and 2122 and persist for at least up to 30 nozzle diameters. In contrast, they rarely appear at $Re=594$. The origin of some of the encapsulated water droplets can be traced back to the entrained water ligaments during the initial roll-up of Kelvin–Helmholtz vortices. Analysis using random forest-based procedures shows that the fraction of compound droplets does not vary significantly with $Re$, but increases rapidly with droplet diameter, reaching 78 % for 2 mm droplets. Consequently, the size distributions of compound droplets have peaks that increase in magnitude and shift to a lower diameter with increasing $Re$. On average, the interior pockets raise the oil–water interfacial area by 15 %, increasing with diameter and axial location. Also, while the oil droplets are deformed by the jet’s shear field, the interior interfaces remain nearly spherical, consistent with prior studies of the deformation of isolated compound droplets for relevant capillary numbers and viscosity ratio.
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Timoshin, Anton, Nikolay Mitin, Alexander Oleynikov, Maria Timoshina, and Evgeniya Mitina. "Clinical and Laboratory Testing of a New Modification of Two-Layer "Silep" Dentures Used in Prosthetic Dentistry." Southern Brazilian Journal of Chemistry 28, no. 28 (June 20, 2020): 53–62. http://dx.doi.org/10.37633/sbjc.28(28)2020.53-62.
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Dentistry is a part of medicine, where various polymer materials were used for the first time. Many factors forced researchers to find more stable, versatile, and hygienic materials for the manufacture of dental products. It is important to note that the search for the ideal polymer dental material is still ongoing. This is because modern polymers, in some cases, do not meet the specified requirements for chemical, physical, strength, and elastic properties. Based on the data on the method of creating and using silicone material for the base of the removable prosthesis "Gossil", an improved silicone material for two-layer dentures "Silep" was developed, as well as a special primer for better connection of the lining with the rigid acrylic base of the prosthesis. To evaluate the most suitable compound, materials were tested for several parameters, such as tensile strength, elongation, and shore hardness. In addition to selecting a suitable material for modification, the selection and testing of an adhesive that allows the chemical bonding of the acrylate surface to the siloxane surface were carried out
Dissertations / Theses on the topic "Silicone-based Compound"
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"Exploratory Study of Distortionary Corrective Modification of Concrete Contraction Joints Through Infused Polymerized Siloxanes-Based Compounds." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.53684.
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abstract: Deformation during hydration of concrete includes curling at joints and terminations. Previous research has explored mix designs, chemical additives, and other material factors to minimize slab distortion due to curling. This research study explores the development and use of externally applied silicone-based compounds after both the placing and cutting of joints. This exploratory study presents the results of controlled testing and a field study results that include distortion of contraction joints as measured with a Spectra LL300N under existing environmental conditions. Specifically, the study presents the results of a side-by-side test of two slabs, a base case, and a silicone-altered case, as well as field measures of two large commercial buildings using the developed methods. The results of the study show reduced distortion due to curling as compared to standard comparative slabs and warrant the continued exploration and testing of the concept.Dissertation/Thesis
Doctoral Dissertation Civil, Environmental and Sustainable Engineering 2019
Book chapters on the topic "Silicone-based Compound"
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Mark, James E., Dale W. Schaefer, and Gui Lin. "Preparation, Analysis, and Degradation." In The Polysiloxanes. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780195181739.003.0004.
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Elemental silicon on which the entire technology is based is typically obtained by reduction of the mineral silica with carbon at high temperatures: . . . SiO2 + 2C → Si 2CO (2.1) . . . The silicon is then converted directly to tetrachlorosilane by the reaction . . . Si + 2Cl2 → SiCl4 (2.2) . . Tetrachlorosilane can be used to form an organosilane by the Grignard Reaction . . . SiCl4 + 2 RMgX → R2SiCl2 + 2 MgClX (2.3). . . This relatively complicatreaction has been replaced by the so-called Direct Process or Rochow Process, which starts from elemental silicon as is illustrated by the reaction . . . Si + 2 RCl → R2SiCl2 (2.4) . . . This process also yields RSiCl3 and R3SiCl, which can be removed by distillation. Compounds of formula R2SiCl2 are extremely important as intermediates to a variety of substances having both organic and inorganic character. Hydrolysis gives dihydroxy structures, which can condense to give the basic [–SiR2O–] repeat unit. The nature of the product obtained depends greatly on the reaction conditions. Basic catalysts and higher temperatures favor higher molecular weight linear polymers. Acidic catalysts tend to produce cyclic small molecules or low molecular weight polymers. The hydrolysis approach to polysiloxane synthesis has been largely replaced by ring-opening polymerization of organosilicon cyclic trimers and tetramers, with ionic initiation. These cyclic monomers are produced by the hydrolysis of dimethyldichlorosilane. Under the right conditions, at least 50 wt % of the products are cyclic oligomers. The desired cyclic species are separated from the mixture for use in ring-opening polymerizations such as those described in the following section. In addition, “click” chemistry has been developed for new synthesis techniques in general, and polymerizations in particular. These approaches have been used to prepare polysiloxane elastomers and polydimethylsiloxane (PDMS) copolymers that can function as thermoplastic elastomers. New synthetic strategies for structured silicones, based on B(C6F5)3 have also been developed. Another new approach involves enzymes, such as the lipase enzymatically catalyzed synthesis of silicone aromatic polyesters and silicone aromatic polyamides.
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Maltman, Alex. "The Minerals that Make Rocks and Soils." In Vineyards, Rocks, and Soils. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780190863289.003.0008.
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This chapter is about the minerals based on silicon and oxygen, the silicates, the ones that make siliceous rocks. And because this means most rocks, apart from limestone and the other calcareous materials, they are often referred to as the “rock- forming minerals.” Let’s be clear at the outset that with these siliceous rocks we’re talking about silicate compounds, which involve the element silicon and a subgroup of silica minerals, which we’ll come to at the end of the chapter. None of this has anything to do with silicone, the synthetic polymer of multifarious uses. The principles discussed here are the same as those developed in the previous chapter, but the silicates present special challenges. Indeed, for a long time they were very tricky things to understand at all. The early geologists had at their disposal new ways of chemically analyzing minerals, and they applied them with gusto. They made impressively rapid progress, but they were baffled by the silicates. Their analyses showed that these minerals were dominated by silicon and oxygen but beyond that, well, they seemed too numerous, wildly varied, and inconsistent. It turned out to be well into the twentieth century before there was a breakthrough in understanding these perplexing compounds. The breakthrough took place when it dawned that X- rays could be used to study the structure of crystals—any crystals: geological, metallurgical, biological, and so on. Today, over twenty Nobel prizes have been awarded for work in this field, most recently in 2012. It’s even relevant to wine itself, through elucidating the structure of enzymes, proteins, and the like. (Incidentally, the use of X-rays to analyze crystals is quite different from its use in producing the familiar X-ray pictures of the human body.) In July 1912, the Bragg family rented a house, Whin Brow, at Cloughton, high above England’s Yorkshire coast. The father of the family, William, was a Professor of Physics at Leeds, and his 22-year-old son, Lawrence, was a precocious physics student at Cambridge. With an impending war, they were eager to escape the grimness of city life for a while, but even so, William took some work with him.
Conference papers on the topic "Silicone-based Compound"
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Mirela, Mihaela. "CURED ANTIBACTERIAL COMPOUND BASED ON SILICONE ELASTOMER REINFORCED WITH NANOPARTICLES." In 17th International Multidisciplinary Scientific GeoConference SGEM2017. Stef92 Technology, 2017. http://dx.doi.org/10.5593/sgem2017/61/s24.011.
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Nituica, Mihaela, Maria Sonmez, Laurentia Alexandrescu, Mihai Georgescu, Maria Daniela Stelescu, Dana Gurau, Aurelia Meghea, Carmen Curutiu, and Lia Mara Ditu. "Cured Antibacterial Compound Based on Silicone Rubber and TiO2 and ZnO Nanoparticles." In The 6th International Conference on Advanced Materials and Systems. INCDTP - Division: Leather and Footwear Research Institute, Bucharest, RO, 2016. http://dx.doi.org/10.24264/icams-2016.i.21.
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Nakano, Mitsuyuki, Haruko Sasaki, and Harumi Ono. "Radiation Resistance of Rubber Compound for Gasket." In ASME 2011 Small Modular Reactors Symposium. ASMEDC, 2011. http://dx.doi.org/10.1115/smr2011-6567.
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Seals of small and medium modular reactors are considered as not important components compared with seals for the large modular reactors which are current-generation plants. Leakage of seals has been a safety concern, however seal maintenance and replacement are costly and time consuming for the current-generation plants. Therefore, integral designs of small and medium modular reactors eliminate the need for seals. However it is impossible to eliminate seals completely from the detail design and equipments. Seals consisting of organic materials are estimated as serious damaged components at design basis accident (DBA). Especially it is no exaggeration to say that rubber gaskets are weakest gasket at DBA. In the point of view we must know about behavior of rubber deterioration under condition at DBA. It is very important to select rubber compound from a viewpoint of not only adequate rubber that has characteristic required for each specification but also consideration about rubber deterioration under condition at normal plant operation and DBA. However rubber for gasket has not been selected based on precise studies with enough data concerned about the rubber deterioration because there have been less studies in the world. From compression set test, swelling test, and Fourier transform infrared spectroscopy (FT-IR) analysis, it has been indicated that chemical structure of both Ethylene propylene diene monomer rubber (EPDM) and Silicone rubber might be broken by radiation, and crosslinking of elastomer by radiation might progress at the same time. In fact, EPDM compounds have good results of compression set after radiation exposure and Silicone rubber does not have good results. It had been predicted that breakage and crosslinking of elastomer chemical structure caused by radiation would have been more serious on Silicone rubber. On the other hand, it has been estimated that breakage of chemical structure of Fluoro-rubber is more influenced by crosslinking of elastomer by radiation, than influence by low molecular elastomer caused by deterioration have been generated. From these results it is considered that Fluoro-rubber is weak against radiation compared to another elastomer. If Fluoro-rubber must be chosen because of its high thermal resistance for example, a radiation condition of environment should be considered seriously. Unfortunately we could not find significant correlation between compression set and general properties. However results of elongation at breakage indicates possibility of relationship to compression set.
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Jonsdottir, Fjola, Rut Gudmundsdottir, Sven Th Sigurdsson, Bergthora S. Snorradottir, and Mar Masson. "Numerical Modeling of Controlled Release of Drugs From Silicone Elastomers." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4957.
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Silicone based medical devices, where the function is enhanced by the release of a drug or other bioactive compound, are of interest for a variety of applications. Such a device must release the drug at a given rate over a given period of time, while maintaining the shape and material properties required for the primary function of the device. Achieving these goals in an optimal fashion is challenging if one relies solely on traditional experimental work. Accurate numerical modeling compliments experimentation by allowing fast evaluation of parameters and subsequent validation of a select set of promising cases. Our ultimate goal is a numerical model which can accurately predict drug release characteristics from silicone elastomers with complicated geometry and inhomogeneous drug dispersion. In this work, we lay the foundations for such a comprehensive model. We describe a numerical model for simple geometries and carry out a parametric study for various initial and boundary conditions. We validate our modeling work by comparison with experimental trials, carried out by our own group. The work is carried out in a group composed of engineers and pharmaceutical scientists, ensuring step-by-step validation of models against experimental results.
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Xie, Bin, Haochen Liu, Xiao Wei Sun, Xingjian Yu, Kai Wang, and Xiaobing Luo. "Reduced Working Temperature of Quantum Dots-Light-Emitting Diodes Optimized by QDs@Silica-on-Chip Structure." In ASME 2018 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/ipack2018-8301.
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White light-emitting diodes (WLEDs) composed of blue LED chip, yellow phosphor, and red quantum dots (QDs) are considered as a potential alternative for next-generation artificial light source with their high luminous efficiency (LE) and color-rendering index (CRI). While, QDs’ poor temperature stability and the incompatibility of QDs/silicone severely hinder the wide utilization of QDs-WLEDs. To relieve this, here we proposed a separated QSNs/phosphor structure, which composed of a QSNs-on-chip layer with a yellow phosphor layer above. A silica shell was coated onto the QDs surface to solve the compatibility problem between QDs and silicone. With CRI > 92 and R9 > 90, the newly proposed QDs@silica nanoparticles (QSNs) based WLEDs present 16.7 % higher LE and lower QDs working temperature over conventional mixed type WLEDs. The reduction of QDs’ temperature can reach 11.5 °C, 21.3 °C and 30.3 °C at driving current of 80 mA, 200 mA and 300 mA, respectively.
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Mosser, Mark F. "Progress on Environmentally Compliant Aluminum Ceramic Compressor Coatings." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54294.
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During the last decade there has been an increasing emphasis on compliance to ever stricter environmental laws as well as compliance to regulations that have been designed to protect workers from exposure to toxic or otherwise harmful substances or processes. This world-wide emphasis has forced a continuing review of materials and processes used in the manufacture and protection of compressor materials from corrosion. Turbine compressors have been coated with silicone aluminum paint, diffused nickel cadmium and aluminum pigmented ceramic coatings that contain hexavalent chromium. These three processes utilize various chemicals including toxic substances, carcinogens and volatile organic compounds (VOC). All three of the coating processes need to be either made compliant or eliminated from use. This paper will review efforts that have been made to develop compliant aluminum ceramic compressor coating materials as applied to various steel and stainless steel substrates. In all cases the new materials that have been developed are free of toxic or carcinogenic materials. Test results will be compared to specification requirements for chrome containing compressor coatings in the area of physical properties including surface finish, thickness and adhesion. Additionally, environmental test data will be presented based on standard test methods that compare new compliant coatings with conventional chrome containing materials. Finally, process steps and conditions will be described for these new coatings.
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Miron, Geneviève, and Jean-Sébastien Plante. "Design of a Durable Air-Muscle With Integrated Sensor for Soft Robotics." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47872.
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Soft robotics integrates compliant actuators and sensors that expand design possibilities beyond classic robotics based on rigid modular components. In particular, deformable elastomer-based actuators used in soft robots, such as air-muscles, offer the possibility of having large numbers of embedded degrees of freedom. However, air-muscles fatigue life and strain capability call for a tradeoff, limiting their practical use in demanding applications such as physical rehabilitation, medical robotics, and mobile robots. This paper presents the design of a durable high-strain air-muscle composed of a silicone tube and an axially elastic sleeve (radially rigid), which integrates a flexible Dielectric Elastomer (DE) position sensor. The uniformity of the sleeve, by opposition to usual braids, makes for a reinforcement without local stresses that cause membrane failure. Designed based on fatigue failure principles, this air-muscle withstands 145 000 cycles at 50 % elongation, which demonstrates its potential as a durable high-strain actuator. Performance maps of the air-muscle confirm good linearity between force, pressure and strain and demonstrate bi-directional force capability. Furthermore, the integration of a DE sensor allows for accurate position control of the air-muscle (0.17 mm), making the air-muscle/sensor unit a relevant building block for complex soft robotics systems. The all-polymer high-strain actuator/sensor unit proves to be accurate and durable as well as cost-effective, thus making it ideal for soft robotics applications requiring large numbers of actuators and integrated sensing.
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Zarepoor, Masoud, Zhijian Ren, and Carmel Majidi. "Fabrication and Testing of a Soft Shape Memory Alloy Actuator With an Integrated Liquid Metal Sensor." In ASME 2020 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/smasis2020-2437.
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Abstract This paper introduces the fabrication and calibration of a soft shape memory alloy actuator with an integrated liquid metal sensor. The actuator is capable of transforming from an unactuated soft curled shape to an actuated rigid straight shape when it is electrically activated. The surface-bonded sensor is a capacitive strain gauge capable of tracking actuator curvature, which is composed of microfluidic channels of liquid metal alloy embedded in a soft silicone elastomer. The sensor has limited impact on the mechanical properties of the actuator due to being soft and lightweight. The fabrication procedure of the actuator is demonstrated in detail, and it is explained how the actuator can be easily fabricated using rapid prototyping techniques, such as laser cutting and stencil lithography. Then, the calibration procedure shows how the capacitance of the bonded strain gauge can be related to the actuator curvature by aligning capacitance data from the sensor with the actuator’s curvature captured by a fast camera. Finally, we implemented a closed-loop control strategy to show the effectiveness of the integrated sensor in improving the actuator performance. The used control scheme provides a method for optimizing actuation in a way that maximizes actuation amplitude. For optimal control, we use a learning-based approach with a covariant matrix adaptive evolutionary strategy (CMA-ES). It is shown that small change in either applied voltage or actuation time will lead to a large difference on the actuation performance.
Reports on the topic "Silicone-based Compound"
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Brumbach, Michael T., Alex James Mirabal, Michael Kalan, Ana B. Trujillo, and Kevin Hale. Materials Chemistry and Performance of Silicone-Based Replicating Compounds. Office of Scientific and Technical Information (OSTI), November 2014. http://dx.doi.org/10.2172/1164595.
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