Добірка наукової літератури з теми "Uv paints"
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Статті в журналах з теми "Uv paints"
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Homa, Piotr, Beata Tryba, and Andżelika Gęsikiewicz-Puchalska. "Impact of paint matrix composition and thickness of paint layer on the activity of photocatalytic paints." Polish Journal of Chemical Technology 19, no. 1 (March 28, 2017): 113–19. http://dx.doi.org/10.1515/pjct-2017-0016.
Повний текст джерелаАнотація:
Abstract Silicate, acrylic and latex photocatalytic paints were analyzed in regards to impact of paint matrix composition and paint layer’s thickness on performance in two photocatalytic tests. These included performances in photocatalytic decomposition of benzo[a]pyrene (BaP) and assessment of photocatalytic activity through use of smart ink test. Silicate photocatalytic paints displayed lower photocatalytic activity in comparison to acrylic and latex photocatalytic paints in both tests, despite the similar content of nanocrystalline TiO2. Measurements of depth of UV light penetration through the paints layer were performed and it appeared, that more porous structure of coating resulted in deeper penetration of UV light. In the case of acrylic paint, the thickness of the photocatalytic layer was around 9 μm, but for silicate paint DR this thickness was higher, around 21 μm.
2
Zhang, Xiao Ning, Wen Bin Cao, Yan Hong Li, and Fan Yong Ran. "Preparation of N-Doped TiO2 Photocatalytic Paint and its Sterilization Performance under Visible-Light Irradiation." Key Engineering Materials 336-338 (April 2007): 1964–67. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1964.
Повний текст джерелаАнотація:
A new functional photocatalytic paint was prepared by adding N-doped nanocrystalline anatase TiO2 powders into self-engineered oxidation resistance latex paint system. The property of the UV-Vis light absorbance of the paint was characterized. The effects of the amount, types, and the introducing methods of the TiO2 in the paints on the behavior of the UV absorption, photocatalytic properties of the paint were systematically investigated. UV-Vis absorption spectra reveal that the ultraviolet light can strongly be absorbed by the paints. The absorption edge of the N-doped nanocrystalline anatase powders modified paint has red-shifted to visible light region. The colony counting method is used to study its sterilization performance under visible light irradiation. The sterilization experiments show that the rate of sterilizing staphylococcal bacteria by the N-doped TiO2 modified paint can exceed more than 99% after the paint has been irradiated by the visible light for 2 to 4 hours.
3
Liu, Panmiao, Zhuoying Xie, Fuyin Zheng, Yuanjin Zhao, and Zhongze Gu. "Surfactant-free HEMA crystal colloidal paint for structural color contact lens." Journal of Materials Chemistry B 4, no. 31 (2016): 5222–27. http://dx.doi.org/10.1039/c6tb01089j.
Повний текст джерелаАнотація:
A new type of structural color paint was fabricated by dispersing poly(methyl methacrylate-hydroxyethyl methacrylate) (PMH) nanoparticles in 2-hydroxyethyl methacrylate (HEMA) solvent without additional surfactants. The paints then were directly cast to form structural color contact lenses by UV polymerization in moulds.
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Bogdan, Sofia, Cecilia Deya, Oscar Micheloni, Natalia Bellotti, and Roberto Romagnoli. "Natural products to control biofilm on painted surfaces." Pigment & Resin Technology 47, no. 2 (March 5, 2018): 180–87. http://dx.doi.org/10.1108/prt-01-2017-0004.
Повний текст джерелаАнотація:
Purpose This paper aims to study five vegetables extracts as possible additives to control bacterial growth on indoor waterborne paints. The extracts were obtained from the weeds Raphanus sativus, Rapistrum rugosum, Sinapis arvensis, Nicotiana longiflora and Dipsacus fullonum, used in traditional medicine as antimicrobial compounds. Design/methodology/approach Weeds extracts were characterized by Fourier transform infrared spectroscopy and UV–Vis spectrophotometry. Their antibacterial activity against Escherichia coli and Staphylococcus aureus was also determined. Afterward, selected extracts were incorporated in waterborne paint formulations. The paints’ antimicrobial activity was assessed against S. aureus, monitoring biofilm formation by environmental scanning electron microscopy. Findings As a general rule, results showed that tested paints were efficient in inhibiting biofilm formation, especially that formulated with Nicotiana longiflora. Practical implications The tested paints can be used to protect walls from microbial colonization, which shortened coatings’ useful life by discoloration and/or degradation. Concomitantly, indoor microbial colonization by aerosols could be also diminished. This is especially important in places that should have high standards of environmental hygiene, as in the food industry, health-care and sanitary centers. Originality/value The main value of this research was to study the antimicrobial activity of weeds extracts and to incorporate them in waterborne paints to diminish bacterial biofilm formation. This biofilm discolors and degrades the paint, and causes health problems. The use of natural compounds in coatings is increasing because of the convenience of using renewable sources, such as natural antimicrobials, in paint formulations.
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Solano, Ricardo, David Patiño-Ruiz, and Adriana Herrera. "Preparation of modified paints with nano-structured additives and its potential applications." Nanomaterials and Nanotechnology 10 (January 1, 2020): 184798042090918. http://dx.doi.org/10.1177/1847980420909188.
Повний текст джерелаАнотація:
Recently, an increase in the production of intelligent nanomaterials has been reported for the application of solid surface coating. These nanomaterials provide a wide number of functionalities such as anticorrosive, antibacterial, and self-cleaning properties. Hence, titanium dioxide (TiO2) and zinc oxide (ZnO) nanoparticles were synthesized using a green chemistry approach. These nanoparticles were fully characterized by scanning electron microscopy, energy-dispersive X-ray, high-resolution transmission electron microscopy, X-ray diffraction, ultraviolet (UV)–visible spectroscopy, Brunauer–Emmett–Teller test, and nitrogen adsorption–desorption isotherm. Then, a commercial enamel-type paint was modified by using different concentrations (2, 3.5, and 5 w/v%) of nanoparticles. These nanofilled paints were then brushed onto the surface of different types of materials such as carbon steel sheets, wood sheets, and aluminum disks. Anticorrosive, self-cleaning, and antibacterial properties of the nanofilled paints were evaluated, with the aim to determine the capability for this application. According to the characterization results, TiO2 and ZnO nanoparticles exhibited similar physicochemical properties compared to those synthesized using traditional methods. The anticorrosion results revealed that nanofilled paints provide a barrier using low concentrations of nanoparticles, due to the decrease of agglomerates on the surface avoiding the presence of high porosity. In the case of self-cleaning, a proposed mechanism of degradation demonstrated that the presence of both nanoparticles in the paint provided high degradation of methylene blue due to the high surface area offered by the nanoparticles. On the other hand, antibacterial activity under UV light was observed only for ZnO nanoparticles, which may be related to the diffusion of nanoparticles into the cell membrane of the bacteria, affecting the normal function. These results showed to be promising for the modification of paints with TiO2 and ZnO nanoparticles, and the application on solid surfaces for the construction, and even in textile fields.
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Malshe, V. C., and S. Elango. "Substituted benzotriazole as UV absorber for paints." Surface Coatings International Part B: Coatings Transactions 87, no. 4 (December 2004): 277–84. http://dx.doi.org/10.1007/bf02699677.
Повний текст джерела
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Cárdaba, Irene, Luca Porcarelli, Antonela Gallastegui, David Mecerreyes, and Miren Itxaso Maguregui. "Easy-to-Make Polymer Hydrogels by UV-Curing for the Cleaning of Acrylic Emulsion Paint Films." Polymers 13, no. 13 (June 26, 2021): 2108. http://dx.doi.org/10.3390/polym13132108.
Повний текст джерелаАнотація:
The cleaning of acrylic emulsion paint surfaces poses a great challenge in the conservation field, due to their high water sensitivity. In this article, we present easy-to-make polymer hydrogels, made by UV-photopolymerization, that show excellent cleaning properties. The formulation of hydrogels obtained by UV-curing and their performance as dry cleaners for acrylic paints was investigated. First, different hydrogel formulations based on functional acrylic monomers were used to formulate a series of UV cross-linked hydrogels by fast UV photopolymerization. Their effectiveness on surface dirt removal was investigated by SEM microscopy and colorimetry. The hydrogels showed excellent cleaning properties and controlled water release, and they still performed satisfactorily after several cleaning uses. The obtained UV-hydrogels were compared to the well-known agar gels, showing benefits in terms of reducing excess water. This article shows that easy-to-make UV-cured hydrogels are an efficient tool for the cleaning of surface dirt from water-sensitive paintings, overcoming the limits of traditional cleaning methods.
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Ibrahim, Bahruddin, Zuchra Helwani, Ivan Fadhillah, Arya Wiranata, and Joni Miharyono. "Properties of Emulsion Paint with Modified Natural Rubber Latex/Polyvinyl Acetate Blend Binder." Applied Sciences 12, no. 1 (December 29, 2021): 296. http://dx.doi.org/10.3390/app12010296.
Повний текст джерелаАнотація:
The direct use of natural rubber latex (NRL) as a binder for emulsion paints did not produce emulsion paints with good opacity, washability resistance, and regulated touch drying time, even when mixed with polyvinyl acetate (PVAc). This study aimed to study the properties of opacity (hiding power), washability resistance, and set drying touch time of emulsion paint with a binder added from a mixture of modified natural rubber latex (NRL) and PVAc. NRL modifications included UV photodepolymerization with TiO2 catalyst and grafting copolymerization of methyl methacrylate and styrene (NRL-g-(MMA-co-St)). NRL was mixed with PVAC at ratios of 0/100; 15/85; 25/75; 35/65; 50/50; 100/0% w/w before being used as a binder for emulsion paint. Emulsion paint samples had different binder contents, namely 2, 4, 6, and 8% w/w. Tests on paint samples included opacity using a UV-Vis spectrophotometer (EASYSPEC safas Monaco), washability using the Digital BGD 526 Wet Abrasion Scrub Tester, and drying time set using the ASTM STP500 procedure. The results showed that the opacity (hiding power), washability resistance, and set drying touch time met the emulsion paint standards for all binder levels, except the 100% w/w modified NRL composition. The higher level of NRL in the binder causes these properties to decrease and become unstable. The best opacity (hidden power), washing resistance, and drying touch time were obtained on modified NRL with a concentration of 15% w/w. The binder content in the paint was around 4% w/w, with an opacity of about 1.78% abs, washing resistance of 12 times, and the set drying touch time to 80 min.
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Gennaro, M. C., V. Gianotti, F. Alberi, S. Angelino, and M. Scagliotti. "CHROMATOGRAPHIC DETERMINATION OF UV ABSORBERS IN CAR PAINTS." Journal of Liquid Chromatography & Related Technologies 22, no. 17 (January 1999): 2689–700. http://dx.doi.org/10.1081/jlc-100102052.
Повний текст джерела
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Cimino, Dafne, Raffaella Lamuraglia, Ilaria Saccani, Michela Berzioli, and Francesca Caterina Izzo. "Assessing the (In)Stability of Urban Art Paints: From Real Case Studies to Laboratory Investigations of Degradation Processes and Preservation Possibilities." Heritage 5, no. 2 (March 24, 2022): 581–609. http://dx.doi.org/10.3390/heritage5020033.
Повний текст джерелаАнотація:
Urban art as a shared expression of street art between artists, citizenship and municipalities has always had an important role in the social life and appearance of modern cities. However, the durability of urban and street artworks is susceptible to the degradation processes that the employed commercial paint formulations undergo once outdoors. These are complex mixtures of compounds, differently sensitive to environmental agents according to their chemical nature. Starting from the colorimetric analysis of murals created in 2010, 2011 and 2018 in Reggio Emilia, Italy, documenting their degradation already after a few months, this study aimed at understanding the stability of the most unstable paints used by the artists in these artworks. A multi-analytical approach evaluated the commercial products under the chemical point of view, after natural and accelerated ageing. Additionally, two manufactured anti-UV varnishes were evaluated for their possible use as coatings. The results pinpointed the weaknesses of the selected paints and highlighted how the application of an anti-UV coating might slightly affect the visual aspect of the artwork, though ensuring a greater resistance to the outdoor conditions due to their minor chemical sensitivity to environmental agents.
Дисертації з теми "Uv paints"
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Вихристюк, Ольга Володимирівна. "Поліграфічне підприємство з дослідженням технології виготовлення етикеткової продукції". Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/46346.
Повний текст джерелаАнотація:
Пояснювальна записка до магістерської дисертації на тему
«Поліграфічне підприємство з дослідженням технології виготовлення
етикеткової продукції» складається з 112 сторінок, що містять в собі 7
розділів та підрозділи. Загальна кількість ілюстрацій становить 49, таблиць –
52, кількість джерел згідно з переліком посилань 33.
Магістерська дисертація складається з семи основних розділів, де
детально розкрито головні технічні, конструкторські особливості етикеток,
обрано необхідне обладнання та матеріали для виготовлення етикеткової
продукції. Проаналізовано всі процеси виготовлення етикеткової продукції,
починаючи від вибору способу друку, необхідного друкарського
устаткування, додрукарських процесів, технології виготовлення друкарських
форм, і закінчуючи післядрукарською обробкою.
Розроблено загальну блок-схему технологічних процесів виготовлення
етикеткової продукції. Розраховані основні техніко-економічні показники.
Проведений аналіз патентної інформації засвідчив, що розробки по
вдосконаленню технологій виготовленні етикеткової продукції проводяться й
надалі. Однак в межах таких тенденцій надто мало уваги приділено саме
методам контролю, що, безумовно, є актуальним напрямком подальших
наукових досліджень, так як дозволить суттєво покращити якість відтворення
поліграфічної продукції.
В експериментальній частині магістерської дисертації здійснено
постановку завдання дослідження, де визначено, що удосконалення процесу
виготовлення етикеткової продукції є необхідним для покращення технології
виготовлення етикеткової продукції, зокрема, було досліджено дефекти при
виготовленні етикеткової продукції та досліджено колірні показники
пантонних кольорів під час друкування накладу етикеткової продукції.The explanatory note to the master's dissertation on the topic "Printing company with research on the technology of manufacturing label products" consists of 112 pages, containing 7 sections and subsections. The total number of illustrations is 49, tables - 52, the number of sources according to the list of references 33. The master's dissertation consists of seven main sections, which reveal in detail the main technical, design features of labels, selected the necessary equipment and materials for the manufacture of label products. All processes of manufacturing label products are analyzed, starting from the choice of printing method, necessary printing equipment, pre-printing processes, technology of manufacturing printing plates, and ending with post-printing processing. The general block diagram of technological processes of production of label products is developed. The main technical and economic indicators are calculated. The analysis of patent information showed that the development of improved technologies for the manufacture of label products is carried out in the future. However, within such trends, too little attention is paid to control methods, which, of course, is an important area of further research, as it will significantly improve the quality of reproduction of printed products. In the experimental part of the master's dissertation the research task was set, where it was determined that the improvement of the label manufacturing process is necessary to improve the technology of label production, in particular, defects in label manufacturing were investigated.
Объяснительная записка к магистерской диссертации по «Полиграфическое предприятие с исследованием технологии изготовления этикеточной продукции» состоит из 112 страниц, содержащих 7 разделов и подразделы. Общее количество иллюстраций составляет 49, таблиц – 52, количество источников согласно ссылкам 33. Магистерская диссертация состоит из семи основных разделов, где подробно раскрыты главные технические, конструкторские особенности этикеток, выбрано необходимое оборудование и материалы для изготовления этикеточной продукции. Проанализированы все процессы изготовления этикеточной продукции, начиная от выбора способа печати, необходимого печатного оборудования, допечатных процессов, технологии изготовления печатных форм и заканчивая послепечатной обработкой. Разработана общая блок-схема технологических процессов изготовления этикеточной продукции. Рассчитаны главные технико-экономические характеристики. Проведенный анализ патентной информации показал, что разработки по совершенствованию технологий при изготовлении этикеточной продукции проводятся и в дальнейшем. Однако в рамках таких тенденций слишком мало внимания уделено именно методам контроля, что безусловно является актуальным направлением дальнейших научных исследований, так как позволит существенно улучшить качество воспроизведения полиграфической продукции. В экспериментальной части магистерской диссертации осуществлена постановка задачи исследования, где определено, что усовершенствование процесса изготовления этикеточной продукции необходимо для улучшения технологии изготовления этикеточной продукции, в частности, были исследованы дефекты при изготовлении этикеточной продукции и исследованы цветовые показатели пантонного цвета при печатании тиража.
2
Regan, Christopher James. "The durability of water-borne acrylic coating systems." Thesis, Manchester Metropolitan University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337183.
Повний текст джерелаАнотація:
The objectives of this research programme were to examine the influence of manufacturing and processing parameters on the environmental stability of aqueous acrylic based latices and to also extend the programme to an assessment of the behaviour of various stabiliser types suitable to such materials through either end-group modification or direct in-situ addition. During the research programme a number of physical and chemical techniques were assessed to routinely characterise and monitor the photochemical and thermal degradation of acrylic latices. These were based on emulsion polymerised formulations of methyl methacrylate and butyl acrylate. In the first instance, acrylic latices based on different formulations were chosen as homopolymers and copolymers. Here the nature of impurities and oxidation products generated during various stages of their manufacture have to be characterised and inter-related to their influence on subsequent environmental degradation. This involved the use of reflectance FT-IR spectroscopy to show functional group changes together with colourimetric U.V. analysis to determine photochemical generation of hydroperoxides. The early chemical changes and their subsequent influence on the physical and chemical properties of the latices during the later stages of environmental degradation were found to exhibit a close inter-relationship. In this regard the formation and the manufacturing temperatures and periods were crucial. Thermal methods of analysis were also used to characterise differences in the properties of the latices before and during thermal and photochemical oxidation. The nature of the residual persulphate initiator and the compositions of the latices in terms of end group modification were important parameters. De-esterification and hydroperoxide formation were found to be important processes during latex degradation while the use of low levels of co-monomer addition. such as methacrylic acicL to the emulsion reaction gave latices with improved light stability. Subsequent aspects of the research programme involved a detailed investigation into the behaviour and performance of various stabiliser types and formulations. Thus, while coreactive hindered piperidine stabilisers was found to be effective, the incorporation of simple terminal dialkyl acrylamide/methacrylaroide groups were also found to be effective. The efficiency of dialkylamide groups operating through a sacrificial mechanism is discussed. The influence of these processing operations on subsequent stabiliser activity provides valuable information on the mode of action of these stabilisers in such complex media. Further work involved a study into the effect of fluorinated methacrylates used in emulsion polymerised formulations. Here, the presence of residual starting materials in the monomer was found to have a detrimental effect in terms of photostability. Subsequent analysis of acrylic resins, based on solution polymerised formulations of methyl methacrylate and fluorinated methacrylates, was undertaken. The influence of reactive stabiliser types on these resins was important and to improve stabiliser perfonnance, synergistic stabiliser formulations were studied. This project will provide important fundamental information on the behaviour of active chromophores produced during the manufacturing process and hopefully resuh in the development of monitoring methodologies to establish paint quality.
3
Mohammadpour, Violet, and Oskar Hane. "Toward an energy self-sufficient paint shop." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-49356.
Повний текст джерелаАнотація:
As manufacturing is creating welfare and prosperity, it is important for humankind. Nevertheless, manufacturing is causing the depletion of natural resources, environmental burdens affecting the health of animals, humans and eco-systems, and social conflicts. Thus, it is essential to implement sustainability into manufacturing. Paint shops are however known for being liable for a big part of the large energy consumptions within manufacturing. Therefore, it is necessary to investigate what cost-effective solutions can be implemented in paint shops in order to reduce the energy consumption in a sustainable manner. Hence, the aim of this study was to, from a manufacturing perspective identify possible cost-effective solutions for lowering energy consumption within paint shops. The aim was further divided into two research questions: • RQ1: What are the enablers for energy efficient paint shops? • RQ2: What are the challenges for energy efficient paint shops? The research approach used to answer the aim and research questions were a literature review and a case study. The literature review was performed to get a deeper understanding of the subject and was then complimented with the findings from the case study. The case study was performed at the paint shop of a global automotive manufacturing company in Sweden, which currently have a high energy consumption. The enablers identified were (1) implementation of solar photovoltaic, and an energy storage system, which enables an environmentally friendly way of generating energy on-site and store excess energy for later use. The energy storage system can also be used to save money by utilizing the fluctuating electricity market prices, charging the battery when the energy price is at its lowest. (2) Implementation of an UV-curing system and paint, which is an environmentally harmless method of curing paint. (3) Reducing or disabling the heating, ventilation and air conditioning system of a building when it is not a necessity. (4) Workers commitment and motivation towards sustainability, to ensure everyone’s participation. The challenges identified were (1) the expensiveness of sustainability, allocating and prioritizing it in budgets is challenging for a company since profitability is always a major concern that often overshadows sustainability. (2) The risk of modifying the processes within the paint shop, as the consequences are unexplored. (3) In its current state, the energy consumption of the paint shop is very high, it is hence difficult to provide the whole paint shop with solely solar photovoltaic. (4) An energy storage system requires space and freeing up that space is a challenge without reconstructing existing facilities. (5) With implementation of UV- curing, the paint used must be curable with UV-light. Additionally, complex three-dimensional shapes make it challenging to properly cure evenly with UV-curing. (6) It is not guaranteed whether it is possible to completely shut down heating, ventilation and air conditioning since industrial equipment in general is designed to always run. (7) Sustainability is not a focus and even if it is increasingly requested by society, the commitment of companies is experienced as low. It is challenging to motivate all the employees to work towards sustainability and find ways to always keep sustainability in mind and to prioritize it over other alternatives.
4
Torfgård, Olof. "Short wavelength UV–LED photoinitiated radical polymerization of acrylate–based coating systems—A comparison with conventional UV curing." Thesis, Uppsala universitet, Strukturkemi, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-442431.
Повний текст джерелаАнотація:
The present work was performed at Sherwin–Williams Sweden group AB with the objective of comparing short-wavelength light emitting diodes (UVB/UVC) with the conventional mercury arc lamp as a curing method of acrylate-based, UV-paint undergoing free-radical polymerization when exposed to UV-radiation. Due to environmental and health risks, mercury-doped radiation sources will be phased out in the near future, according to the United Nations Minamata convention, hence new alternatives are needed. Light-emitting diodes differ from the mercury arc lamp as they provide semi-discrete output intensity lines within the UV spectrum instead of a broad output distribution with several main intensity lines. The power output is also considerably lower compared to the conventional method which limits the irradiance and dose that are key parameters in activating and propagating free-radical polymerization of UV-paint. Seven different light-emitting diodes between 260–320 nm was examinedand compared to the conventional mercury arc lamp. Cured coatings were evaluated by measuring the relative extent of acrylate conversion with ATR-FTIR and micro-hardness indentation test. Both methods correlate to the relative cross-linking density and qualitatively describe the curing process for each radiant source at a specific irradiance and dose. Three different paint formulations with widely different properties were used in the experiments. All three paints were able to cure with one or several light emitting diodes at comparable doses and 10 to 20 times lower irradiance to the conventional mercury arc lamp, resulting in similar acrylate conversion and hardness.
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Donon, Jeremy. "Caractérisation de paires d’ions par spectroscopies IR, UV et rayons X, interprétées par calculs de chimie quantique." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPASS106.
Повний текст джерелаАнотація:
Les paires d'ions sont omniprésentes dans la nature, depuis l'eau de mer, les aérosols, jusqu'aux organismes vivants. Elles influencent les propriétés des solutions concentrées en ions, et jouent ainsi un rôle majeur dans divers réactions chimiques et processus biologiques. Cependant, la caractérisation des paires d’ions se heurte à une double difficulté : d'une part, plusieurs types de paires coexistent, et d'autre part, ce sont des espèces transitoires en solution. Dans ce contexte, ce travail présente plusieurs études menées selon trois axes de recherche principaux grâce à une approche originale en phase gazeuse, puis en solution. Le premier axe consiste à étudier les effets du champ électrique produit par la paire d’ions sur la spectroscopie d’un chromophore UV en phase gazeuse (effets Stark). Les groupes ioniques sont capables de produire un champ électrique suffisamment élevé pour induire des effets Stark électroniques significatifs sur un chromophore UV situé à proximité. Cette étude est menée sur des systèmes modèles de formule générale (C₆H₅-(CH₂)n₋COO⁻,M⁺) avec M = Li, Na, K, Rb, Cs et n = 1-3, permettant de faire varier le champ électrique ressenti par le chromophore UV. Ces différents systèmes sont étudiés en phase gazeuse par spectroscopie UV combinée à des calculs de chimie quantique, ainsi que par des expériences de spectroscopie IR sélective en conformation. Grâce à cette approche, des attributions conformationnelles précises peuvent être proposées pour des transitions électroniques séparées de quelques cm-1, sur la base de l’analyse des effets Stark observés sur le spectre UV, sans recourir à la spectroscopie IR, ni aux calculs de fréquences. Il s’agit ensuite de comprendre les effets d’environnement sur les paires d’ions par des expériences de microsolvatation en phase gazeuse. La paire d’ions d’acétate de sodium [CH₃-COO⁻,Na⁺] est étudiée pour la première fois dans un complexe trimère avec le p-xylène par spectroscopie IR. Des expériences de microhydratation sont ensuite réalisées sur des paires d’ions chargées ([CH₃-COO⁻,M²⁺] ; M = Ca, Ba), mettant en évidence deux comportements différents en fonction de la nature du dication. Les différentes expériences montrent que la signature IR du groupement carboxylate est sensible à son environnement proche, mais également à l’environnement du cation qui lui est apparié. Le dernier axe consiste à détecter et identifier les structures formées par les ions dans les solutions électrolytiques par spectroscopies IR et RX. Une première analyse est effectuée sur des solutions électrolytiques ([CH₃-COO⁻,M⁺] ; M = Li, Na et K) par spectroscopie IR-TF en variant la concentration en ions. Une étude théorique est ensuite réalisée dans l’objectif de proposer un spectre théorique pour chaque type de paires, et de les confronter aux spectres expérimentaux en solution. L’approche repose sur le calcul de la signature IR de paires ([CH₃-COO⁻,M⁺] ; M = Li, Na, K, Rb et Cs) et de l’anion libre, entourés successivement de molécules d’eau explicites décrites au niveau chimie quantique, puis au niveau champ de force et enfin par un modèle de solvant continu. Pour chaque type de paires, des familles spectroscopiques compatibles avec les données expérimentales sont identifiées. Cette approche originale ouvre la voie vers l’identification des structures supramoléculaires dans les solutions électrolytiques. Enfin, la première expérience FZRET en micro-jet liquide est réalisée sur une solution d’acétate de potassium, donnant accès à une mesure de la distribution des distances entre cations et anions appariés. Au cours de ces études, différentes méthodes sont employées allant de l’expérience à la théorie, de la phase gazeuse à la solution. Cette thèse illustre la nécessité de combiner plusieurs méthodes afin d’obtenir des données complémentaires permettant une meilleure caractérisation de l’organisation supramoléculaire des ions et de leur environnementIon pairs are ubiquitous in nature, from sea water, aerosols, to living organisms. They influence the properties of concentrated ion solutions, and thus play a crucial role in various chemical reactions and biological processes. However, the characterization of ion pairs faces some difficulties: on one hand, several types of pairs coexist, and on the other hand, they are transient species in solution. In this context, this work presents several studies carried out according to three main research studies, backed by an original approach in the gas phase, and then in solution. Firstly, the effects of the electric field produced by the ion pair on the UV spectroscopy of a chromophore in gas phase (Stark effects) are studied. The ion groups can produce an electric field high enough to induce significant electronic Stark effects on a nearby UV chromophore. This study is conducted on model systems (C₆H₅-(CH₂)n-COO⁻,M⁺) with M = Li, Na, K, Rb, Cs and n = 1-3, allowing to vary the electric field experienced by the UV chromophore. These different systems are studied in the gas phase by UV spectroscopy combined with quantum chemistry calculations, as well as by conformation selective IR spectroscopy. Based on the analysis of the electronic Stark effects, precise conformational assignments can be proposed for electronic transitions separated by a few cm-1, without resorting to IR spectroscopy, or frequency calculations. The next study is focused mainly on understanding the environmental effects on ion pairs by microsolvation experiments in gas phase. The pair of sodium acetate ions [CH₃-COO⁻,Na⁺] is studied for the first time in a trimer complex with p-xylene by IR spectroscopy. Microhydration experiments are then carried out on charged ion pairs ([CH₃-COO⁻,M²⁺]; M = Ca, Ba), highlighting two different behaviours depending on the nature of the cation. The final research is to detect and identify the structures formed by the ions in electrolytic solutions by IR and RX spectroscopy. The first experiment is carried out on electrolytic solutions ([CH₃-COO⁻,M⁺]; M = Li, Na and K) by TF-IR spectroscopy by varying the ion concentration. A theoretical study is then carried out in order to propose a theoretical spectrum for each type of pair, and to confront them with experimental spectra in solution. The approach is based on the calculation of the IR signature of pairs ([CH₃-COO⁻,M⁺]; M = Li, Na, K, Rb and Cs) and free anion in solution, where the first solvation layer were described at the quantum level, followed by a solvent continuum. For each type of pair, spectroscopic families, consistent with the experimental data, are identified. This original approach paves way to the identification of supramolecular structures in electrolytic solutions. Finally, the first FZRET experiment in liquid micro-jet is carried out on a potassium acetate solution, providing access to a measurement of the distance distribution between cations and paired anions.In these studies, different methods are used ranging from experiment to theory, from the gas phase to solution. This work illustrates the need to combine several methods in order to obtain additional data and allow a better characterization of the supramolecular organisation of ions and their environment
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Keskin, Zulufkar. "Kraftlignin i oljefärg för ökat UV-skydd av trä –effekt på vidhäftning, kemi och struktur. : Kraft Lignin in oil paint for increased UV protection of wood - effect on adhesion, chemistry and structure." Thesis, Karlstads universitet, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-84987.
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Bruno, Giovanni Urruth. "Avaliação da degradação natural e acelerada de revestimentos orgânicos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2018. http://hdl.handle.net/10183/179540.
Повний текст джерелаАнотація:
A proteção de materiais com alto valor agregado contra as intempéries é de grande importância tecnológica e econômica. Atualmente, a principal defesa diante do desgaste natural destes materiais é o revestimento, seja inorgânico, orgânico ou metálico. Um revestimento pode atuar de diversas formas para proteger o material em questão, atuando como barreira física, metal de sacrifício ou proteção anódica. O desenvolvimento de revestimentos protetores de alta durabilidade e baixo custo é de suma importância para o crescimento da indústria e das cidades em todo o mundo. Diante disso, este trabalho estuda a degradação de quatro revestimentos orgânicos comerciais, de diferentes composições químicas e propriedades físicas, com o objetivo de interpretar os fenômenos que ocorrem durante os ensaios e investigar as falhas apresentadas ao longo do tempo. As análises foram realizadas com uma tinta epóxi branca, uma tinta poliuretânica branca, uma tinta alquídica branca e um verniz acrílico. Cada um dos revestimentos estudados possui um mecanismo diferente de formação do filme sobre o substrato escolhido, aço carbono, e, portanto, possui características individuais específicas. A degradação dos filmes orgânicos foi realizada com a exposição dos corpos de prova à radiação ultravioleta (UV), de forma natural e acelerada, a fim também de avaliar diferenças e o comportamento destes revestimentos As amostras em exposição natural permaneceram durante um ano em contato com radiações solares, umidade, chuva e variações de temperatura. Já as amostras em exposição acelerada foram ensaiadas em uma câmara de intempéries aceleradas de UV por até 2000 horas. A degradação dos filmes foi acompanhada durante todos os ensaios e analisada por diferentes técnicas de caracterização, tais como: DSC, FTIR, MEV, EDS, FRX, microscopia óptica, espectrofotometria de cor; ensaios mecânicos de impacto, flexibilidade, aderência, rugosidade, além de medições periódicas de espessura. Paralelamente, exposições prolongadas em câmara úmida e névoa salina foram realizadas como parâmetro de comparação. Os resultados demonstram que a tinta poliuretânica sofre menores variações de cor e brilho, após os ensaios de degradação e que o verniz acrílico é o mais afetado na maioria dos casos. A tinta alquídica sofreu alterações significativas em névoa salina, entretanto, teve melhoras em suas propriedades mecânicas após as exposições ao UV. Quanto à comparação entre o ensaio de degradação natural e o artificial, conclui-se que cada ensaio interfere de diferentes maneiras nas propriedades dos revestimentos.The protection of materials with high added value against the weather has great technological and economic significance. Currently, the main defense against the natural wear of these materials is the coating, whether inorganic, organic or metallic. A coating can act in various ways to protect the material in question, acting as a physical barrier, sacrificial metal or anodic protection. The development of protective coatings of high durability and low cost is very important for the growth of industry and cities around the world. Therefore, in this work are studied the degradation of four organic coatings, with different chemical compositions and physical properties, in order to interpret the phenomena that occur during the tests and to investigate the failures presented over time. The analyses were performed with a white epoxy paint, a white polyurethane paint, a white alkyd paint and an acrylic lacquer. Each one of the studied coatings has a different mechanism of film formation on the chosen substrate, carbon steel, and therefore has specific individual characteristics. The degradation of the organic films was carried out by exposing the specimens to ultraviolet (UV) radiation, in a natural and accelerated way, in order to clarify their differences and establish comparisons. The samples in natural exposure remained for a year outside, in contact with solar radiation, humidity, rainfall and temperature variations The accelerated exposure samples were tested in a chamber of accelerated UV for up to 2000 hours. The films degradation were monitored during all the tests and analysed by different characterization techniques, such as: DSC, FTIR, SEM, EDS, FRX, optical microscopy, color spectrophotometry; mechanical impact tests, flexibility, adhesion, roughness, in addition to periodic thickness measurements. At the same time, prolonged exposures in humidity chamber and salt spray were performed as a parameter of comparison. The results demonstrate that the polyurethane paint undergoes smaller variations of its properties after the tests and that the acrylic varnish is the most affected in most cases. About the comparison between the natural and the artificial degradation test, it is concluded that each test interferes in different ways in the properties of the coatings.
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Wang, M. (Meng). "Polymer integrated Young interferometers for label-free biosensing applications." Doctoral thesis, Oulun yliopisto, 2012. http://urn.fi/urn:isbn:9789514299643.
Повний текст джерелаАнотація:
Abstract Integrated optical (IO) sensor allowing sensitive, label-free, real-time and multi-parameter monitoring of bio-molecular interactions are conventionally fabricated with inorganic dielectrics inherited from CMOS manufacturing technology. Polymers as complement materials to inorganic dielectrics are becoming to have an increasing market share for IO circuits in optical communications networks owing to its good optical properties, versatile processibility and low cost. This work aims at developing disposable low-cost biosensors based mainly on polymeric materials, with a performance comparable to inorganic-dielectric based IO biosensors. This thesis describes the development of polymer IO biosensors based on the Young interferometer (YI) transducer platform for ambient noise compensation and a complete periodic intensity fringe pattern. Three different waveguide configurations were utilized, taking into consideration operational simplicity, fabrication simplicity and enhanced sensitivity. Among the developed polymer biosensors, an unconventional interferometer structure: a vertically placed dual-slab waveguide interferometer and an inverted rib waveguide configuration were employed. To enhance the sensitivity of the waveguides, deposition of Ta2O5 high index coating was performed on the rib waveguide configuration. Along with the development of polymer biosensors based on the inverted-rib waveguide configuration, a fabrication process was also developed featuring UV-imprinting and spin coating. The simple two-step fabrication process demonstrated using a polymer mold is potentially transferable to the roll-to-roll manufacture process. Calibration of the developed sensors was performed by homogeneous refractive index (RI) sensing with glucose de-ionized water solutions. By investigating an antibody – antigen binding interaction involving C-reactive protein and its conjugates, this thesis confirmed the applicability of the developed sensors to specific molecule detection. Moreover, to establish the influence of water molecular absorption on measurement stability, an evaluation was carried out on the polymeric waveguide. Finally, the thesis presented a comparison between the developed sensors, exploring their sensitivities, stabilities, limits of detection (LODs) and other aspects related to operation and fabrication. The results indicated that the Ta2O5-coated polymer waveguide sensor had a high sensing capability. In homogeneous RI sensing, the achieved detection limits were 9×10-7 RIU (refractive index unit), i.e., three times the noise level, and 270 fg/mm2 for surface mass densityTiivistelmä Integroidulla optiikalla toteutetut anturit mahdollistavat biomolekulaarisen vuorovaikutuksen tutkimisen käyttäen herkkiä moniparametrisia ja merkkiaineettomia menetelmiä. Näiden bioantureiden valmistukseen käytetään tavallisesti CMOS-teknologian piiristä tuttuja epäorgaanisia puolijohteita ja eristemateriaaleja. Viime aikoina on kuitenkin polymeeristen materiaalien käyttöä integroidussa optiikassa tutkittu merkittävästi johtuen polymeerien hyvistä optisista ominaisuuksista, monipuolisesta työstettävyydestä ja edullisista kustannuksista. Tämän työn tarkoituksena on kehittää edullisia, kertakäyttöisiä, pääasiallisesti polymeerisistä materiaaleista valmistettuja bioantureita, jotka vastaavat suorituskyvyltään epäorgaanisista materiaaleista valmistettuja integroidun optiikan antureita. Tässä työssä kehitetyt polymeeriset integroidun optiikan bioanturit perustuvat Youngin interferometriin mahdollistaen ympäristökohinan kompensoinnin ja ne tuottavat pintavuorovaikutusten tutkimiseen jaksoittaisen interferenssikuvion. Työssä hyödynnettiin kolmea erilaista valokanavarakennetta huomioiden niiden käytön helppous, valmistuksen yksinkertaisuus ja mittausherkkyys. Yksi kehitetyistä polymeerisistä bioantureista koostui päällekkäisistä kerrostetuista polymeerikerroksista. Toisen tutkitun rakenteen toiminta puolestaan perustui käänteiseen harjannevalokanavaan. Mittausherkkyyttä parannettiin pinnoittamalla polymeerirakenne Ta2O5-pinnoitteella. Näin muodostui kerrostettu komposiittivalokanava, joka oli tässä työssä tutkittu kolmas sensorirakenne. Itse bioanturien lisäksi kehitettiin myös valmistusprosessi, jossa hyödynnettiin UV-painatusta ja nestefaasipinnoitusta. Tässä työssä havaittiin lisäksi, että kehitetty yksinkertainen valmistusmenetelmä on paitsi toimiva, myös mahdollisesti siirrettävissä rullalta rullalle valmistus- ja tuotantoteknologiaan. Kehitettyjen anturien kalibrointi suoritettiin homogeenisella taitekerroinmittauksella käyttäen liuoksia, jotka valmistettiin glukoosista ja deionisoidusta vedestä. Kehitettyjen anturien soveltuvuus spesifien molekyylien tunnistamista varten todennettiin tutkimalla vasta-aineiden ja antigeenien sitoutumisreaktioita ja vuorovaikutusta C-reaktiivisella proteiinilla ja sen konjugaateilla. Lisäksi työssä tutkittiin veden absorption vaikutusta mittauksen stabiilisuuteen. Tutkimuksessa suoritettiin vertailu kehitettyjen anturien ja niiden ominaisuuksien välillä kiinnittäen huomiota mittausherkkyyteen, stabiilisuuteen, määritys- ja toteamisrajoihin ja muihin anturien valmistukseen sekä käyttöön liittyviin keskeisiin piirteisiin. Tulokset osoittavat, että Ta2O5-pinnoitetun polymeerivalokanavan mittausherkkyys oli suurin vertailluista rakenteista. Homogeenisessä taitekerroinmittauksessa saavutettu määritys- ja toteamisraja oli 9×10-7 taitekerroinyksikköä (RIU). Pintamassatiheysmittauksessa saavuttu tulos oli 270 fg/mm2
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Robinson, Kathleen Clare. "Cutaneous Biology and Endogenous Opioids: How the Skin Modulates Pain and Addiction." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:11215.
Повний текст джерелаАнотація:
The Proopiomelanocortin gene, (POMC), produces many biologically active peptides including the endogenous opioid, β-endorphin, and the melanocortins: α-Melanocyte Stimulating Hormone, (αMSH), γMSH, βMSH and Adrenocorticotropic Hormone, (ACTH). βendorphin is released by the brain in response to stress or injury and is a potent analgesic. Melanocortins are well known for regulating pigmentation, metabolism, and cortisol levels. Additionally, opioids and melanocortins are known to have opposing actions in several settings including the regulation of pain and metabolism. The Melanocyte Stimulating Hormones are expressed in the skin where they bind the Melanocortin 1 Receptor on melanocytes and promote pigmentation. It has been reported that β-endorphin is also produced in the skin, however it was not believed to have a central effect. In this thesis I show that expression of these peptides in the skin is reflected in blood levels and affects nociception and behavior.
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Chen, Shih Wei, and 陳世偉. "The study of nanoparticles on physical properties of UV curable paints and their curing kinetics." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/45551829451854489274.
Повний текст джерелаАнотація:
碩士國立臺北科技大學
化學工程系碩士班
92
The aim of this study was to synthesize 2-HEMA/silicate hybrid nanocomposite via the process of photopolymerization. Hybridization of the organic and inorganic components was obtained by using the sol-gel method, then tripropylene glycol diacrylate as crosslinking agent and photoinitiator were added to formulate UV curable resin. In this study, concentration of organic component (2-HEMA)in sol-gel process used to investigate its effect on the curing behavior and the thermo-physical properties of cured film. DPC and FTIR were employed to monitor the UV curing reaction and find the radiating time for complete reaction. UV Curing kinetic was study by the DPC, and the thermo-physical properties, morphology were detect by DSC,TGA,SEM. Experimental results from this study indicate that, the curing behavior of UV resin was depended on the solvent concentration and the silicate content which make the gel effect early or delay. The size of silicate in the composite was around 50~60nm,so the composite exhibits excellent optical and physical properties. The excellent optic and physical properties of composite was resulted from the well dispersion of nano-size silicate in the hybrid.
Книги з теми "Uv paints"
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Chemistry & technology of UV & EB formulation for coatings, inks & paints. London: SITA Technology, 1991.
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2
Chemistry & technology of UV & EB formulation for coatings, inks & paints. London: SITA Technology, 1991.
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3
Holman, R. UV and EB Curing Formulation for Printing Inks Coatings & Paints. 2nd ed. Scholium International, 1988.
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4
Limited, SITA Technology, ed. [Chemistry & technology of UV & EB formulations for coatings, inks, and paints]. Chichester: Wiley, 1998.
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S, Allan N., and Oldring P. K. T, eds. Chemistry & technology of UV & EB formulation for coatings, inks and paints. London: SITA Technology, 1991.
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Braithwaite. Chemistry & Technology of Uv & Eb Formulation for Coatings, Inks & Paints: Formulation. Scholium Intl, 1991.
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P, Carroy, Oldring P. K. T, and SITA Technology Limited, eds. Speciality finishes: Chemistry & technology of UV & EB formulation for coatings, inks & paints. London: Wiley in association with SITA Technology Limited, 1997.
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Neckers, Douglas C., Wolter Jager, and DC Neckers. Photoinitiation for Polymerization: UV & EB at the Millennium, Volume VII, Chemistry & Technology for UV & EB Formulation for Coatings, Inks & Paints. John Wiley & Sons, 1999.
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Pappas, P., C. Decker, J. P. Dowling, B. Monroe, and A. Carroy. Chemistry & Technology of Uv & Eb Formulation for Coatings, Inks & Paints: Specialty Finishes (Chemistry & Technology of UV & Eb Formulation for Coatings,). S I T a Technology, 1994.
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T, Oldring P. K., and Dufour P, eds. Chemistry and technology of UV and EB formulation for coatings, inks and paints. London: SITA Technology, 1991.
Знайти повний текст джерелаЧастини книг з теми "Uv paints"
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Bishop, Thomas. "UV-Induced Erythema." In Encyclopedia of Pain, 4139–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_4703.
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Rukwied, Roman. "UV Erythema, a Model for Inducing Hyperalgesias." In Encyclopedia of Pain, 4135–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_4702.
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Hermans, C., A. C. Vandaele, S. Fally, M. Carleer, R. Colin, B. Coquart, A. Jenouvrier, and M. F. Merienne. "Absorption Cross-section of the Collision-Induced Bands of Oxygen from the UV to the NIR." In Weakly Interacting Molecular Pairs: Unconventional Absorbers of Radiation in the Atmosphere, 193–202. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0025-3_16.
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Pfeilsticker, Klaus, H. Bösch, R. Fitzenberger, and Claude Camy-Peyret. "Spectroscopic and Thermochemical Information on the O2−O2 Collisional Complex Inferred From Atmospheric Uv/Visible O4 Absorption Band Profile Measurements." In Weakly Interacting Molecular Pairs: Unconventional Absorbers of Radiation in the Atmosphere, 273–84. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0025-3_24.
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Raza Shah, Tayyab, Chao Zhou, and Hafiz Muhammad Ali. "Titanium Dioxide: Advancements and Thermal Applications." In Titanium Dioxide - Advances and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.101727.
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Distinctive characteristics of titanium dioxide such as high refractive index, overwhelmingly high melting and boiling point, high toughness, and hardness, photocatalytic nature, ability to absorb or reflect UV-rays, DeNox catalyst, nontoxicity, inert behavior, etc., have brought about the massive use of TiO2 in a variety of conventional as well as advanced engineering applications. Broad commercial utilization of titanium dioxide in products including paints, anti-air pollutants, cosmetics, skincare and sunblock, pharmaceuticals, surface protection, building energy-saving, etc., accounts for its multibillion dollars market worldwide. Titanium dioxide carries unique thermal and optical characteristics and therefore has gained significance as a potential candidate for advanced applications such as clean hydrogen fuel harvesting, photoelectric solar panels, photothermal conversion, treatment of exhaust gases from combustion engines and power plants, thermal energy storage, thermal management of electronic devices and photovoltaics, and nano-thermofluids. This chapter presents a brief insight into some of the noteworthy characteristics and a comprehensive overview of advanced thermal applications of TiO2.
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"UV Light." In Encyclopedia of Pain, 4139. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_102428.
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"UV Erythema." In Encyclopedia of Pain, 4135. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_102427.
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Li, Jingtian, Adam Watkins, Kassandra Arevalo, and Matthew Tovar. "UV Mapping." In Creating Games with Unity, Substance Painter, & Maya, 299–320. CRC Press, 2020. http://dx.doi.org/10.1201/9781003050490-8.
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Li, Jingtian, Kassandra Arevalo, and Matthew Tovar. "UV Mapping." In Creating Games with Unreal Engine, Substance Painter, & Maya, 321–42. CRC Press, 2020. http://dx.doi.org/10.1201/9781003053101-8.
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"UV-B Erythema." In Encyclopedia of Pain, 4139. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-28753-4_102429.
Повний текст джерелаТези доповідей конференцій з теми "Uv paints"
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Nömayr, Richard. "UV-Stability and Associated Failure Mechanism of Thin Film Automotive Paints." In SAE 2006 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-0752.
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Rong Zhong, Qiuhua Xu, Fan Xiong, Yu Xie, and Yunhua Gao. "Notice of Retraction: Studies on the UV curable paints of metal based on polyurethaneacrylate." In 2011 2nd International Conference on Artificial Intelligence, Management Science and Electronic Commerce (AIMSEC 2011). IEEE, 2011. http://dx.doi.org/10.1109/aimsec.2011.6009682.
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Asmatulu, R., K. S. Erukala, and M. M. Rahman. "Enhancing the Strengths of Adhesion Bonds Between Composite Surface and Coating via UV Treatments." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-72455.
Повний текст джерелаАнотація:
Field of composites is rapidly growing in many industries such as aviation, energy and automotive industries. Composites are known to have a high strength to low weight ratio. Significant improvement in the performance of coatings used in the protection of military and civil aircraft has been achieved the last thirty years. Composite coatings are exposed to many environmental conditions, which can significantly affect their properties. In this research, UV light treatment on the surface of composite was introduced to examine its effects on the adhesion properties between the coating and substrate. A cross-cut test was conducted on the composite panels to assess the adhesion of paint to the substrate after the treatments. Coating performance analyses were also carried out using a Fourier transform infrared spectrometer, water contact angle, and optical microscopic images. The first set of panels was treated with UV radiation for 0, 2, 4 and, 8 days, and the surface wettability was also assessed using the contact angle test. Two coats of paints, including a primer and top coat, were used, and the panels were exposed to UV radiation and immersed in water for 500 hrs and 1000 hrs. It was found that untreated panels showed a much higher contact angle of 106°, whereas the contact angle of panels treated with UV radiation was reduced to 47°. The cross-cut tests showed considerable flaking of the coating along the edges and squares of panels that were not treated, and very small flakes along the edges and parts of the grid square on panels that were UV treated, thus confirming the enhancement of coating adhesion between composite and coating surfaces by UV treatments.
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Matsuda, Yu, Kaori Ueno, Hiroki Yamaguchi, Yasuhiro Egami, and Tomohide Niimi. "Development of Organic Electroluminescent Sensor for Pressure/Oxygen Measurement." In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73063.
Повний текст джерелаАнотація:
Pressure-sensitive paints (PSP) and pressure-sensitive molecular film (PSMF) are drawing much attention, since the techniques enable us to measure pressure/oxygen concentration distribution with high spatial resolution. A measurement system of PSP/PSMF is generally composed of a sensor layer (PSP/PSMF itself), an illumination light source, a photo-detector, and optics such as optical filters and mirrors. Since dye molecules in a sensor layer are photo-excited by an illumination light, the measurement system needs optical windows to transmit UV light for the illumination light and needs an optical filter to eliminate the illumination light, which also reduces the luminescence detected by a photo-detector. We have proposed a novel concept of a pressure sensor called electroluminescent pressure/oxygen sensor (ELPS/ELOS) based on oxygen quenching of electroluminescence without an external illumination light source. The sensor was fabricated as an organic light-emitting device (OLED) with phosphorescent dyes whose phosphorescence can be quenched by oxygen molecules, and with a polymer electrode which permeates oxygen molecules. The pressure sensitivity of the fabricated ELPS sample was equivalent to that of the sensor excited by an illumination light source. Moreover, the pressure sensitivity of the sensor is comparable to that of conventional PSP.
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Arosio, Franco, and Ingo Lange. "Lifetime Protection of Iron Casted Brake Discs for Electric Vehicles through Advanced Heat Treatment Technology." In EuroBrake 2021. FISITA, 2021. http://dx.doi.org/10.46720/1978791eb2021-mds-006.
Повний текст джерелаАнотація:
The rise of Electrical Vehicles (EVs) is unstoppable and EVs will become a key part of the mainstream automotive market. According to recent post-COVID-19 scenarios based on IHS data, EVs will surge up to 14% of global passenger car sales in 2027 and go up to 57% in 2040. The electrification of future mobility concepts is going along with new requirements also for the brake system. EVs with regenerative braking applications utilize the traditional friction brakes in fewer circumstances due to recuperation: therefore the risk of superficial corrosion increases. In case of an emergency brake situation the basic requirement is that the braking surface will be free of corrosion to have maximum brake power. Thus, the corrosion-free condition on the braking surface is a safety requirement at any time. The state of the art solution consists of paintings or “coatings”, such as ultraviolet (UV)-hardening paint, Zn or Zn/Al paints, which can perform well in new conditions (e.g. up to 120 hours in standard UNI ISO 9227 salt fog chamber). But these solutions will be easily abraded within approximately 20 standard-condition braking applications. The corrosion-free condition during the lifetime of the disc is not achieved yet in the current state of the art; rust or corrosion can seriously downgrade the braking performances. This paper is describing an innovative 2-step process to improve the corrosion and wear resistance of standard cast iron brake discs. In the first step, the amount of undesired graphite lamellae will be reduced from the surface with customized parameters, according to the individual types of grey cast iron material of the substrate. This pre-process is followed by a thermochemical diffusion process including controlled oxidation of the substrate resulting in high corrosion protection of the rotors. The authors will produce proof of corrosion resistance up to 300 hours in salt conditions according to UNI ISO 9277. In addition, bench tests and vehicle endurance tests have been performed in cooperation with Tier 1 and OEMs and have shown increased wear resistance even with non-electric cars and with standard ECE brake pads. The novel surface solution could be also applied to non-functional areas of the brake disc like cooling channels, bell and swan neck in order to substitute the current paintings. In summary, the new 2-step heat treatment process is a price competitive solution for corrosion protection of functional and non-functional areas of iron casted brake discs over the entire lifetime, especially on EVs with strong recuperation. But this solution also works for hybrid and conventional cars in preferably on the rear axis with low-abrasive brake pads (e.g. NAO pads). Finally, even when the vehicle fleet goes all-electric, dust emission from brakes and tyres will still pollute the environment. Addressing this topic, the authors will provide an outlook of the ongoing activities to reduce brake dust emissions with innovative surface solutions.
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Makrushin, Andrey, Tobias Scheidat, and Claus Vielhauer. "Capturing latent fingerprints from metallic painted surfaces using UV-VIS spectroscope." In IS&T/SPIE Electronic Imaging, edited by Adnan M. Alattar, Nasir D. Memon, and Chad D. Heitzenrater. SPIE, 2015. http://dx.doi.org/10.1117/12.2078876.
Повний текст джерела
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Chen, Chun-Hsien, Jay Shieh, Chao-Sung Lin, and Jing-Jong Shyue. "Photocatalytic Behaviors of TiO2-SrTiO3 Composite Thin Film and Nanostructure." In ASME 2011 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/smasis2011-4956.
Повний текст джерелаАнотація:
To improve the efficiency of water splitting by photocatalysis, a semiconductor heterojunction made of titanium dioxide (TiO2) and strontium titanate (SrTiO3) is constructed to promote the separation of photo-induced electron and hole (e− /h+) pairs. The photocatalytic behaviors of the TiO2-SrTiO3 composite film and nanostructure fabricated by the sol-gel and hydrothermal methods are studied. UV-visible and ultraviolet photoelectron spectroscopies (UV-Vis & UPS) are adopted to identify the band structure of the TiO2-SrTiO3 heterojunction. For the composite film system, an approximately 0.5 eV band shift at the heterojunction improves the separation of photoinduced e−/h+ pairs. The photocurrent density of the composite film is about 2–3 times larger than that of the TiO2 or SrTiO3 film alone. For the composite nanostructure system, it is composed of an array of TiO2 nanotubes coated with SrTiO3 nanoparticles. An approximately 0.2 eV band shift at the heterojunction is determined for the composite nanostructure. It is found that the size of the SrTiO3 nanoparticles, which can be controlled by the hydrothermal temperature and time, is a key factor in influencing the photocurrent density of the TiO2-SrTiO3 composite nanostructure.
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Habka, Sana, Eric Gloaguen, Michel Mons, and Valerie Brenner. "GAZ PHASE IR AND UV SPECTROSCOPY OF NEUTRAL CONTACT ION PAIRS." In 71st International Symposium on Molecular Spectroscopy. Urbana, Illinois: University of Illinois at Urbana-Champaign, 2016. http://dx.doi.org/10.15278/isms.2016.ti11.
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Wang, Yancheng, Dai Xue, Zhaoxin Deng, and Deqing Mei. "Patterned Microstructure Array Fabrication by Using a Novel Standing Surface Acoustic Wave Device." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2962.
Повний текст джерелаАнотація:
This paper develops a novel standing surface acoustic wave (SAW) device with three-pair of interdigital transducers (IDTs) to fabricate the patterned microstructure arrays with the assistance of ultraviolet (UV) polymerization. The working principle, structural design, and fabrication of the SAW device are presented. Then experimental setup was conducted to investigate the fabrication process and method of the patterned microstructure arrays on a thin liquid polymer surface. By adjusting the input wavelength and working voltage and selecting the pairs of IDTs, several types of patterned microstructure arrays, such as linear undulate and latticed undulate with different surface morphologies, could be fabricated. Results also demonstrated that the developed SAW device with the assistance of UV polymerization is an effective method to fabricate the patterned microstructure arrays, which may have great potential in the application of biomedical and microelectronic fields.
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Karasa, Julija. "ECO-FRIENDLY CLAY-BASE MULTIFUNCTIONAL ADDITIVE IMPROVING PAINT RESISTANCE TOWARDS DEGRADATION PROCESSES INCLUDING UV RADIATION." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/6.3/s26.017.
Повний текст джерелаЗвіти організацій з теми "Uv paints"
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Young, D. P. ,. Jr, W. P. Erickson, M. D. Strickland, R. E. Good, and K. J. Sernka. Comparison of Avian Responses to UV-Light-Reflective Paint on Wind Turbines: Subcontract Report, July 1999--December 2000. Office of Scientific and Technical Information (OSTI), January 2003. http://dx.doi.org/10.2172/15003047.
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