Thematische Bibliographien / Borate de zinc hydraté

Auswahl der wissenschaftlichen Literatur zum Thema „Borate de zinc hydraté“

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Veröffentlicht am 22. Juni 2024

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  2. Dissertationen
  3. Buchteile
  4. Konferenzberichte

Zeitschriftenartikel zum Thema "Borate de zinc hydraté":

1

Schubert. „Hydrated Zinc Borates and Their Industrial Use“. Molecules 24, Nr. 13 (30.06.2019): 2419. http://dx.doi.org/10.3390/molecules24132419.

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Zinc borates are important chemical products having industrial applications as functional additives in polymers, bio-composites, paints and ceramics. Of the thirteen well documented hydrated binary zinc borates, Zn[B3O4(OH)3] (2ZnO∙3B2O3∙3H2O) is manufactured in the largest quantity and is known as an article of commerce as 2ZnO∙3B2O3∙3.5H2O. Other hydrated zinc borates in commercial use include 4ZnO∙B2O3∙H2O, 3ZnO∙3B2O3∙5H2O and 2ZnO∙3B2O3∙7H2O. The history, chemistry, and applications of these and other hydrated zinc borate phases are briefly reviewed, and outstanding problems in the field are highlighted.
2

Song, Jiuqiang, Zhixiong Huang, Yan Qin und Xinyi Li. „Thermal Decomposition and Ceramifying Process of Ceramifiable Silicone Rubber Composite with Hydrated Zinc Borate“. Materials 12, Nr. 10 (15.05.2019): 1591. http://dx.doi.org/10.3390/ma12101591.

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The ceramifiable silicone rubber composite was prepared using hydrated zinc borate and kaolin as ceramifiable fillers. Effects of the hydrated zinc borate content and the combustion temperature on the properties of the ceramifiable silicone rubber composite were investigated. Thermal decomposition and ceramifying processes of the composite in a muffle furnace under air were also studied. The results showed that the density and the hardness of the composites increased as the content of the hydrated zinc borate increased from 0 to 30 phr. The tensile strength and elongation at break decreased. In addition, hydrated zinc borate decreased the decomposition temperature of the composite, whereas the residue weight under air atmosphere was increased. In the process of decomposition and oxidation of the ceramifiable silicone rubber composite in air, B2O3 was generated by the decomposition of zinc borate and participated in the formation of the residue network structure, which decreased the temperature of the ceramifying transition. The new phases, zinc aluminate (ZnO·Al2O3) and aluminum-rich mullite (9Al2O3·2SiO2), appeared after high-temperature thermochemical reactions. Microscopy images revealed that different structures were formed at different temperatures. The network structure of the ceramic residue became increasingly compact, and the compressive strength increased from 0.31 to 1.82 MPa with the increase of temperature from 800 to 1400 °C, which had a better protective effect on heat transfer and mass loss. The weight loss and the linear shrinkage of the ceramic residue was 37.6% and 21.9%, respectively, with the 30 phr content of hydrated zinc borate. The bending strength was improved from 0.11 to 11.58 MPa, and the compressive strength also increased from 0.03 to 1.14 MPa.
3

Mahajan, Dhiraj S., Tushar D. Deshpande, Mahendra L. Bari, Ujwal D. Patil und Jitendra S. Narkhede. „Hydrated and anhydrous zinc borate fillers for tuning the flame retardancy of epoxy nanocomposites“. Journal of Applied Polymer Science 137, Nr. 34 (22.01.2020): 48987. http://dx.doi.org/10.1002/app.48987.

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4

Green, Joseph. „Mechanisms for Flame Retardancy and Smoke suppression -A Review“. Journal of Fire Sciences 14, Nr. 6 (November 1996): 426–42. http://dx.doi.org/10.1177/073490419601400602.

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The prevailing mechanisms for halogen and phosphorus flame retardancy are reviewed. Halogens act in the vapor phase and phosphorus can act in either the vapor or condensed phase depending on the specific phos phorus compound and the chemical composition of the polymer. Halogen- antimony synergy is discussed. Convincing evidence is presented for bromine- phosphorus synergy in specific polymers. The mode of decomposition of polycarbonate is shown and the effect of salts of organic acids in changing the mode of decomposition hence producing a more flame resistant polymer is shown. Intumescence in polyolefins is discussed. Inorganic metal hydrates used in large concentration cool by endothermically releasing a large concentration of water. The effect of boron compounds is discussed. Methods of smoke suppres sion are presented as is the role of zinc borate, molybdenum and tin compounds acting as Lewis acids in PVC.
5

Łopiński, Jakub, Beata Schmidt, Yongping Bai und Krzysztof Kowalczyk. „Effect of the B:Zn:H2O Molar Ratio on the Properties of Poly(Vinyl Acetate) and Zinc Borate-Based Intumescent Coating Materials Exposed to a Quasi-Real Cellulosic Fire“. Polymers 12, Nr. 11 (30.10.2020): 2542. http://dx.doi.org/10.3390/polym12112542.

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In order to investigate an influence of the B:Zn:H2O molar ratio on the fire protection efficiency of poly(vinyl acetate)-based thermoplastic intumescent coating materials (ICs), systems containing ammonium polyphosphate, melamine, pentaerythritol and different types of zinc borates (ZBs) were tested in a vertical position in quasi-real fire conditions. 3ZnO·2B2O3·6H2O (ZB6), 2ZnO·3B2O3·3.5H2O (ZB3.5) or 3ZnO·2B2O3 (ZB0) were added in amounts of 1–10 wt. parts/100 wt. parts of the other coating components mixture. Char formation processes and thermal insulation features were investigated using an open-flame furnace heated according to the cellulosic fire curve. Thermogravimetric features (DTG), chemical structures (FTIR) and mechanical strength of the ICs and the chars were analyzed as well. It was revealed that the type and dose of the ZBs significantly affect thermal insulation time (TIT) (up to 450 °C of a steel substrate) and sagging (SI) of the fire-heated coatings as well as the compressive strength of the created chars. The highest TIT value (+89%) was noted for the sample with 2.5 wt. parts of ZB3.5 while the lowest SI (−65%) was observed for the coatings containing 10 wt. parts of the hydrated borates (i.e., ZB3.5 or ZB6). The best mechanical strength was registered for the sample filled with the anhydrous modifier (3 wt. parts of ZB0). The presented results show that the ICs with the proper ZBs can be used for effective fire protection of vertically positioned steel elements.
6

Schubert, David M. „Zinc Borate Hydrolysis“. Molecules 27, Nr. 18 (06.09.2022): 5768. http://dx.doi.org/10.3390/molecules27185768.

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The crystalline zinc borate phase ZnB3O4(OH)3, known in commerce as 2ZnO·3B2O3·3.5H2O, is an important industrial material used as a fire-retardant synergist in polymers, a source of micronutrients in agriculture, and a preservative in building materials. It lends durability to wood composite building materials by inhibiting attack by wood destroying organisms. The hydrolysis chemistry of this zinc borate is relevant to its industrial use. ZnB3O4(OH)3 exhibits incongruent solubility, reversibly hydrolyzing at neutral pH to insoluble Zn(OH)2 and soluble B(OH)3. It is sparingly soluble with a room temperature solubility of 0.270 wt% in terms of its equivalent oxide components in solution, comprising 0.0267 wt% B2O3 and 0.003 wt% ZnO. Aspects of the hydrolysis chemistry of zinc borate under neutral pH conditions are discussed.
7

Benrashid, Ramazan, Gordon L. Nelson, Donald J. Ferm und Leland W. Chew. „Effect of Zinc, Zinc Oxide and Zinc Borate on the Flammability of Polycarbonate“. Journal of Fire Sciences 13, Nr. 3 (Mai 1995): 224–34. http://dx.doi.org/10.1177/073490419501300305.

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Polycarbonate was blended with zinc, zinc borate (2ZnO·3B2O 3·3.5H2O) and zinc oxide. Blends made of zinc/polycarbonate and especially zinc borate/polycarbonate show major improvement in oxygen index values. Ohio State University (OSU) heat release studies show reduction in heat release only for zinc borate/polycarbonate blends compared to virgin polycarbonate. No improvement in smoke suppression was observed from NBS Smoke Chamber studies for these blends. From DSC studies there was a low ering of Tg's. Thermogravimetric analyses show the blends have lower tempera ture stability in nitrogen (50% weight loss) compared to a control.
8

Wu, Yang, Ji-Yong Yao, Jian-Xiu Zhang, Pei-Zhen Fu und Yi-Cheng Wu. „Potassium zinc borate, KZnB3O6“. Acta Crystallographica Section E Structure Reports Online 66, Nr. 5 (30.04.2010): i45. http://dx.doi.org/10.1107/s1600536810015175.

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9

Benrashid, Ramazan, Gordon L. Nelson und Donald J. Ferm. „Effect of Triaryl Phosphate, Zinc and Zinc Borate on Fire Properties of High Impact Polystyrene and High Impact Polystyrene-Polyphenylene Oxide Blend (Modified-Polyphenylene Oxide“. Journal of Fire Sciences 12, Nr. 6 (November 1994): 529–50. http://dx.doi.org/10.1177/073490419401200605.

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Samples of m-PPO (virgin and flame retarded) and high impact polystyrene blended with zinc and zinc borate (2ZnO·3B2O3·3.5H 2O), were pre pared. The effect of triaryl phosphate on the flame retardancy of PPO-HIPS in conjunction with zinc and zinc borate was studied. For polystyrene zinc borate shows some reduction in smoke generation. Zinc, however does not show any effect on smoke generation for high impact polystyrene. Triphenyl phosphate shows minimal flame retardancy in HIPS which is not enhanced by zinc. Addition of zinc gives an increase in oxygen index for FR m-PPO, whereas zinc borate decreases the OI values. Zinc borate may sequester triaryl phos phate and thus eliminate its vapor phase activity. Zinc borate shows a signifi cant reduction in smoke generation and rate of heat release for m-PPO.
10

Benrashid, R., G. L. Nelson und Donald J. Ferm. „Effect of Zinc and Zinc Borate on Fire Properties of Modified Polyphenylene Oxide“. Journal of Fire Sciences 11, Nr. 3 (Mai 1993): 210–31. http://dx.doi.org/10.1177/073490419301100302.

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Modified polyphenylene oxide resin (m-PPO) (virgin) and m-PPO flame retarded with triaryl phosphate (FR m-PPO) were blended with zinc borate, zinc, and zinc/zinc borate. Both virgin and FR m-PPO containing zinc borate showed a marked reduction in smoke production (flaming and non- flaming-NBS Smoke Chamber). In FR m-PPO a reduction in oxygen index values was seen for zinc borate, except at the highest level tested (50 PHR). Zinc, on the other hand, showed an increase in oxygen index for FR m-PPO. Given the potential for both condensed and vapor phase activity for triaryl phosphate in m-PPO, the reduction in both smoke and oxygen index by zinc borate suggests a deactivation of the vapor phase activity of triaryl phosphate.
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Zeitschriftenartikel Dissertationen

Dissertationen zum Thema "Borate de zinc hydraté":

1

Doumert, Bertrand. „Apport de la RMN 1D/2D à l'étude de systèmes inorganiques boratés : caractérisation structurale du réseau vitreux borophosphate et réactivité des retardateurs de flamme APP-ZBH“. Electronic Thesis or Diss., Université de Lille (2022-....), 2023. https://pepite-depot.univ-lille.fr/ToutIDP/EDSMRE/2023/2023ULILR067.pdf.

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La spectroscopie par Résonance Magnétique Nucléaire (RMN) à l'état solide est devenue une technique incontournable pour caractériser les matériaux inorganiques oxydes. Ces dernières années, la résolution des spectres RMN a été significativement améliorée par le développement de spectromètres de plus en plus puissants. Dans le contexte Lillois, cette amélioration de la résolution a particulièrement bénéficié aux études sur les matériaux boratés synthétisés par les différentes équipes de recherche de l'université. L'objectif de cette thèse est de soutenir le développement des études par RMN sur les matériaux boratés préparés localement en montrant notamment les apports des techniques de RMN de corrélation. Deux types de matériaux ont ainsi été sélectionnés pour l'étude : les verres de borophosphate de zinc préparés au LASIRE et les systèmes retardateurs de flamme à base de borate de zinc hydraté et de polyphosphate d'ammonium préparés à l'UMET.Les matériaux vitreux étudiés sont des borophosphates de zinc de composition xB2O3 - (50-x/2)ZnO - (50-x/2)P2O5, connus pour leur faible température de transition vitreuse (Tg) et leur bonne durabilité chimique. Les analyses par spectroscopie RMN avancée 11B et 31P 1D/2D ont permis de relier l'effet de formateur mixte observé sur la Tg avec la structure du réseau vitreux.Les systèmes de retardateur de flamme basés sur le borate de zinc hydraté (ZBH) et le polyphosphate d'ammonium (APP) sont couramment utilisés dans l'industrie. Les analyse par RMN 1D/2D de ce travail ont contribué à la compréhension du mécanisme de dégradation thermique de chaque composé dans un premier temps et à la compréhension de la réactivité entre les deux composés dans un second temps
Solid-state Nuclear Magnetic Resonance (NMR) spectroscopy has become an essential technique for characterizing inorganic oxide materials. In recent years, the resolution of NMR spectra has been significantly improved by the development of increasingly powerful spectrometers. In the Lille context, this improvement in resolution has particularly benefited studies on borate materials synthesized by the university's various research teams. The aim of this thesis is to support the development of NMR studies on locally-prepared borate materials, in particular by demonstrating the benefits of correlation NMR techniques. Two types of materials have been selected for study: zinc borophosphate glasses prepared at LASIRE, and flame-retardant systems based on hydrated zinc borate and ammonium polyphosphate prepared at UMET.The glassy materials studied are zinc borophosphates with the composition xB2O3 - (50-x/2)ZnO - (50-x/2)P2O5, known for their low glass transition temperature (Tg) and good chemical durability. Analyses by 11B and 31P 1D/2D advanced NMR spectroscopy linked the mixed-former effect observed on Tg with the structure of the glassy network.Flame retardant systems based on hydrated zinc borate (ZBH) and ammonium polyphosphate (APP) are commonly used in industry. The 1D/2D NMR analyses in this work have contributed to understanding the thermal degradation mechanism of each compound in the first instance, and to understanding the reactivity between the two compounds in the second
2

Gurhan, Deniz. „Zinc Borate Production In A Batch Reactor“. Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606996/index.pdf.

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Zinc borate is a flame retardant additive used in polymers, wood applications and textile products. There are different types of zinc borate having different chemical composition and structure. In this study, the production of zinc borate that had the molecular formula of 2ZnO.3B2O3.3,5H2O was studied. The aim of this study was to investigate the effects of reaction parameters on the properties of zinc borate that had been synthesized by the reaction of boric acid and zinc oxide at the existence of the seed crystals and to determine the optimum experimental conditions for zinc borate production reaction. Reaction kinetics was also investigated to find a suitable kinetics model. The effect of boric acid to zinc oxide ratio -H3BO3:ZnO ratio- (3:1, 3.5:1, 5:1 and 7:1), the particle size of zinc oxide (10µ
m and 25µ
m), stirring rate (275 rpm, 400 rpm, 800 rpm and 1600 rpm), temperature (75°
, 85°
and 95°
) and size of seed crystals (10µ
m and smaller size) on reaction rate, reaction completion time, composition and particle size distribution of zinc borate were investigated. Experiments were performed in a continuously stirring, temperature controlled batch reactor with a volume of 1.5L. During the experiments samples were taken to be analyzed in regular time intervals. The analyses of the samples gave the concentration change of zinc oxide and boron oxide in the solid as well as the conversion of zinc oxide to zinc borate with respect to time and the rate of reaction was calculated. The products were also analyzed for particle size distribution. The experimental results showed that the reaction rate increased with the increasing H3BO3:ZnO ratio, particle size of zinc oxide, stirring rate and temperature. The reaction completion time was also decreased by increasing H3BO3:ZnO ratio, stirring rate and temperature. The particle size of final product, zinc borate, decreased with increasing stirring rate and size of zinc borate used as seed and increased with increasing particle size of zinc oxide used as reactant. The average particle sizes of the final product zinc borates synthesized at the end of the experiments were ranged between 4.3 µ
m and 16.6 µ
m. The zinc borate production reaction was mainly fitted the unreacted core model for the case of diffusion through product layer controls.
3

Eltepe, Hüdal Emre Balköse Devrim. „The Development of Zinc Borate Production Process/“. [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000499.pdf.

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4

Erdoğdu, Cem Aykut Balköse Devrim. „The development of synergistic heat stabilizers for PVC from Zinc Borate-Zinc Phosphate/“. [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000509.pdf.

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5

Ozkaraca, Ayse Cagil. „Flame Retrdancy Effects Of Zinc Borate And Nanoclay In Abs“. Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613425/index.pdf.

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In this thesis there were two main purposes, the first one being to investigate effects of zinc borate (ZB) on the flammability behavior of ABS when used with and without a traditional brominated flame retardant (BFR) / antimony trioxide (AO) system. The second purpose was to investigate contribution of nanoclays (NC) to the flame retardancy performance of the same traditional BFR compound with various combinations of AO and ZB again in ABS matrix. For these purposes, materials were melt compounded by using a laboratory scale twin-screw extruder, while specimens were produced by injection or compression molding. Flame retardancy of the specimens were investigated by Mass Loss Cone Calorimeter (MLC), Limiting Oxygen Index (LOI) measurements and UL-94 vertical burning tests. Other characterization techniques required in this thesis were
X-ray diffraction analysis, scanning and transmission electron microscopy, thermogravimetric analysis and tensile tests. Studies for the first purpose indicated that almost all flame retardancy parameters were preserved when antimony trioxide were replaced with zinc borate as much as in the ratio of 1:3. Residue analyses revealed that predominant flame retardancy mechanism of traditional system was gas phase action, while zinc borate contributes especially in the condensed phase action by forming thicker and stronger char layer. Investigations for the second purpose basically concluded that use of nanoclays improved all flame retardancy parameters significantly. Residue analyses pointed out that nanoclays especially contribute to the formation of stronger and carbonaceoussilicate char acting as a barrier to heat and flammable gases and retarding volatilization via tortuous pathway. As an additional third purpose in this thesis, usability of three boron compounds (zinc borate ZB, boric acid BA, boron oxide BO) with two traditional flame retardants (organic phosphinate OP and melamine cyanurate MC) in neat PET and recycled PET were also examined leading to some promising results in MLC parameters.
6

Yao, Zhao Yue. „Synthesis, structure, and mechanical properties of lead- and zinc-copper borate glasses“. Thesis, Rennes 1, 2016. http://www.theses.fr/2016REN1S080.

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Le but de ce travail est d'étudier l'effet de la teneur en cuivre et de la valence des atomes de cuivre sur la structure et les propriétés mécanique du verre. Des verres de zinc- et plomb- cuivre borate ont été étudiés. Les changements structurels avec le remplacement de PbO ou ZnO par CuO sont observés par réflectance infrarouge et Raman. L'état d'oxydation, l'environnement du site et la liaison caractéristique d'ions de cuivre ont été étudiés par spectroscopie optique et de résonance de spin électronique. Les propriétés mécaniques ont été déterminées et corrélées à la structure du verre et à sa composition, en mettant l'accent sur les propriétés élastiques, le comportement d'indentation (dureté et micro-fissures), la ténacité et la dépendance à la température de l'élasticité. Le cuivre a une tendance à stabiliser le bore en coordinence trigonale et donne une structure de type métaborate plus homogène. L'ajout d'ions de cuivre au verre métaborate améliore les performances mécaniques (modules d'élasticité et dureté), et diminue la sensibilité à la température ainsi que le taux de ramollissement des verres au plomb. Toutefois, l'ajout d'ions de cuivre dans les verres au zinc a des effets opposés sur ces propriétés. Les changements chimiques à la surface des verres de borates de cuivre et de zinc après traitement thermique sont également étudiés. L'étude par nanoindentation et par rayage montre que la couche cristallisée améliore la résistance mécanique de la surface du verre
The aim of this work is to study the effect of copper content and copper valence on the structural and mechanical properties of glass. Zinc- and lead- copper borate glasses were studied. Their structural changes with the substitution of CuO for ZnO or PbO are followed by Raman and reflectance infrared. The oxidation state, site environment and bonding characteristic of copper ions are studied by optical and electron spin resonance spectroscopy. The mechanical properties were determined and correlated to the glass structure and composition, with a particular emphasis on the elastic properties, sharp indentation behavior (hardness and micro-cracking), toughness and temperature dependence of elasticity. Copper tends to stabilize trigonal boron and gives a more homogeneous metaborate structure. Adding copper ions to the metaborate glass clearly improves the mechanical performance (elastic moduli and hardness), in the meantime decreases the temperature sensitivity and soften rate of lead borate glasses. However, adding copper ions in zinc borate glasses has opposite effects on these properties. The chemistry changes at zinc-copper-borate glass surface after heat-treatment are also studied. Investigation of the nanoindentation and scratch behavior show that the crystallized layer improves the mechanical resistant of glass surface
7

Baltaci, Berk. „Sytnhesis And Characterization Of Nano Zinc Borate And Its Usage As A Flame Retardant For Polymers“. Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612701/index.pdf.

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The objectives of this study are to synthesize sub-micron sized zinc borate and to use them with other flame retardant additives in poly(ethylene terephthalate) (PET) based composites. The study can be divided into two parts. In the first part, it was aimed to synthesize sub-micron sized zinc borate (2ZnO.3B2O3.3.5H2O) with the reaction of zinc oxide and boric acid. For this purpose, low molecular weight additives or surfactants were used in the syntheses to prevent the agglomeration and to decrease particle size. Effect of type of surfactant and its concentration
effect of using nano-sized zinc oxide as reactant on the synthesis, properties and morphology of 2ZnO.3B2O3.3.5H2O were investigated. Synthesized zinc borates were characterized by X-Ray diffraction (XRD), Scanning Electron Microscope (SEM) and Thermogravimetric Analysis (TGA). The results were compared with a commercial zinc borate, Firebrake (FB). Characterization results showed that at least in one dimension sub-micron size was obtained and synthesized zinc borates did not lose their hydration water until the process temperature of the composites. In the second part of the study, PET based composites, which mainly included synthesized sub-micron sized zinc borates were prepared by using a co-rotating twin screw extruder and injection molding machine. Synergist materials such as boron phosphate (BP) and triphenyl phosphate (TPP) were also used in the composite preparation. The composites were characterized in terms of flammability and mechanical properties. Flammability of composites was determined by using a Limiting Oxygen Index (LOI) test. Mechanical properties such as tensile strength, elastic modulus, elongation at break and impact strength were also studied. According to LOI and impact tests, the composites containing 3 wt. % BP and 2 wt. % zinc borate which was modified with poly(styrene-co-maleic anhydride), 2PSMA05/3BP and 2PSMA1/3BP have higher LOI and impact values when compared to neat PET.
8

Zhao, Chuanli. „The influence of solid additives on the tribological properties of lubricants“. Thesis, University of Hertfordshire, 2013. http://hdl.handle.net/2299/11082.

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The present work investigates the tribological properties of solid particles as lubricant additives in lubricants. Two types of solid particles, Ceria nanoparticles (CeO2) and Zinc borate ultrafine powders (ZB UFPs), were used as the lubricant additives in this study. The friction and wear behaviours of these lubricant additives in different base lubricants were identified. With an appropriate application of these solid lubricant additives, the friction reduction and wear resistance properties of the lubricant have been successfully improved. Without assistance of surfactant or surface modification, the two types of solid particles behave very differently. Evident performance was observed that pure ZB UFPs were capable of considerably reducing the friction coefficient of sunflower oil and liquid paraffin when they were used as a lubricant additive without further treatment. On the contrary, CeO2 nanoparticles did not show noticeable contribution to friction reduction when they were used as the only additive in water. Only when surfactant Sorbitan monostearate was employed to enhance the dispersibility of CeO2 nanoparticles in water, the application of this additive was capable of reducing friction coefficient of the water based lubricant effectively. Surface modification of the solid particles was carried out to improve the dispersibility of these particles in base lubricants. Oleic acid (OA) and Hexadecyltrimethoxysilane (HDTMOS) were selected as the modification agents. Modified CeO2 nanoparticles and ZB UFPs revealed outstanding wear resistance property. An improvement of up to 15 times was identified although this improvement on wear resistance, in this case, was often companied by a rise in friction coefficient. Tribo-films generated by tribo-chemical reaction were observed on most of the worn surfaces and the formation of this tribo-film appeared to have played an important role in the friction and wear behaviours of a system. A tenacious tribo-film with good surface coverage was only generated on the worn surface when HDTMOS modified solid particles were used as lubricant additives. The mechanical properties and elemental composition of the tribo-film were studied with nano-indentation and energy-dispersive X-ray spectroscopy (EDS). Finally, based on the experimental evidence, different functionalities of CeO2 nanoparticles and ZB UFPs as solid lubricant additives were recognized.
9

Delaval, Damien. „Développement et caractérisation de systèmes intumescents retardateurs de flamme pour polypropylènes recyclés issus des véhicules usagés“. Thesis, Lille 1, 2009. http://www.theses.fr/2009LIL10015/document.

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Un des objectifs de ces travaux a été d’évaluer l’effet du recyclage et de polluants (huile moteur (HM) et éthylène glycol (EG)) sur les propriétés d’usage de polypropylènes chocs issus de véhicules usagés. Le recyclage (ici limité à six cycles d’extrusion) n’entraîne pas de modification significative des propriétés mécaniques. L’étude de la cinétique de cristallisation des polymères pollués a montré que l’EG retarde la cristallisation du copolymère. La cinétique de dégradation a permis de simuler et de quantifier les différentes étapes de dégradation des matériaux. Le comportement au feu des polymères est par ailleurs amélioré de manière significative après recyclage et en présence des polluants, particulièrement dans le cas de la pollution à l’HM. Le deuxième axe de l’étude a été consacré à l’ignifugation des matériaux par des systèmes intumescents (formulation à base de polyphosphate d’ammonium (APP) avec et sans agent de synergie (borate de zinc (ZB))). Dans tous les cas les matériaux recyclés et pollués présentent des performances satisfaisantes. Nous avons montré que l’efficacité du char intumescent est gouvernée par sa vitesse de formation et par sa conductivité thermique qui sont influencées positivement par la pollution (avec APP/ZB) et le recyclage (avec APP) (augmentation de la vitesse et diminution de la conductivité thermique). La caractérisation chimique des structures qui se développent dans des conditions de combustion montre la formation d’une structure phosphocarbonée contenant des polyaromatiques, des pyrophosphates et de l’acide phosphorique ainsi que, dans le cas du ZB, des borophosphates (sa formation permet de renforcer la structure intumescente)
The impact of recycling and pollutants (engine oil (EO) and ethylene glycol (EG)) on the intrinsic properties of polypropylene-based materials coming from end-of-life cars was investigated. Recycling (limited here to six extrusion cycles) is not detrimental to the mechanical properties of the polymeric matrices. The crystallization kinetics study realized on the polluted polymers showed that the presence of EG delays crystallization. The degradation kinetics allowed to simulate and quantify the different degradation steps of the materials. Pollutants and recycling also lead to an improvement of the reaction to fire of our copolymer, especially in the case of EO-containing samples. The second part of the work was devoted to the study of the flame retardant properties of our materials provided by ammonium polyphosphate (APP) with or without zinc borate (ZB) (synergistic agent)). In all cases recycled and polluted materials show satisfying performances. It was found that the efficiency of the protective barrier provided by the char is governed by the rapidity of its formation and its thermal conductivity which are positively influenced by EO (with APP/ZB) and recycling (with APP) (increase of the formation rate and decrease of the conductivity). Chemical characterization of the structures formed in a fire scenario reveals the formation of a phosphocarboneous structure containing polyaromatics, pyrophosphates and phosphoric acid and when zinc borate is used, borophosphates which can reinforce the intumescent structure
10

Delaval, Damien. „Développement et caractérisation de systèmes intumescents retardateurs de flamme pour polypropylènes recyclés issus des véhicules usagés“. Electronic Thesis or Diss., Lille 1, 2009. http://www.theses.fr/2009LIL10015.

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Annotation:
Un des objectifs de ces travaux a été d’évaluer l’effet du recyclage et de polluants (huile moteur (HM) et éthylène glycol (EG)) sur les propriétés d’usage de polypropylènes chocs issus de véhicules usagés. Le recyclage (ici limité à six cycles d’extrusion) n’entraîne pas de modification significative des propriétés mécaniques. L’étude de la cinétique de cristallisation des polymères pollués a montré que l’EG retarde la cristallisation du copolymère. La cinétique de dégradation a permis de simuler et de quantifier les différentes étapes de dégradation des matériaux. Le comportement au feu des polymères est par ailleurs amélioré de manière significative après recyclage et en présence des polluants, particulièrement dans le cas de la pollution à l’HM. Le deuxième axe de l’étude a été consacré à l’ignifugation des matériaux par des systèmes intumescents (formulation à base de polyphosphate d’ammonium (APP) avec et sans agent de synergie (borate de zinc (ZB))). Dans tous les cas les matériaux recyclés et pollués présentent des performances satisfaisantes. Nous avons montré que l’efficacité du char intumescent est gouvernée par sa vitesse de formation et par sa conductivité thermique qui sont influencées positivement par la pollution (avec APP/ZB) et le recyclage (avec APP) (augmentation de la vitesse et diminution de la conductivité thermique). La caractérisation chimique des structures qui se développent dans des conditions de combustion montre la formation d’une structure phosphocarbonée contenant des polyaromatiques, des pyrophosphates et de l’acide phosphorique ainsi que, dans le cas du ZB, des borophosphates (sa formation permet de renforcer la structure intumescente)
The impact of recycling and pollutants (engine oil (EO) and ethylene glycol (EG)) on the intrinsic properties of polypropylene-based materials coming from end-of-life cars was investigated. Recycling (limited here to six extrusion cycles) is not detrimental to the mechanical properties of the polymeric matrices. The crystallization kinetics study realized on the polluted polymers showed that the presence of EG delays crystallization. The degradation kinetics allowed to simulate and quantify the different degradation steps of the materials. Pollutants and recycling also lead to an improvement of the reaction to fire of our copolymer, especially in the case of EO-containing samples. The second part of the work was devoted to the study of the flame retardant properties of our materials provided by ammonium polyphosphate (APP) with or without zinc borate (ZB) (synergistic agent)). In all cases recycled and polluted materials show satisfying performances. It was found that the efficiency of the protective barrier provided by the char is governed by the rapidity of its formation and its thermal conductivity which are positively influenced by EO (with APP/ZB) and recycling (with APP) (increase of the formation rate and decrease of the conductivity). Chemical characterization of the structures formed in a fire scenario reveals the formation of a phosphocarboneous structure containing polyaromatics, pyrophosphates and phosphoric acid and when zinc borate is used, borophosphates which can reinforce the intumescent structure
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Buchteile zum Thema "Borate de zinc hydraté":

1

Bährle-Rapp, Marina. „Zinc Borate“. In Springer Lexikon Kosmetik und Körperpflege, 600. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_11301.

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2

Atakul Savrik, Sevdiye, Burcu Alp, Fatma Ustun und Devrim Balkose. „Nano Zinc Borate as a Lubricant Additive“. In Applied Physical Chemistry with Multidisciplinary Approaches, 303–23. Toronto : Apple Academic Press, 2018. | Series: Innovations in physical chemistry. Monograph series: Apple Academic Press, 2018. http://dx.doi.org/10.1201/9781315169415-13.

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3

Piskin, Sabrive, Nil Baran Acarali, Emek Moroydor Derun und Nurcan Tugrul. „Investigation of Reaction Conditions Effecting Hydrophobicity on Zinc Borate Yield“. In Supplemental Proceedings, 379–83. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch47.

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Bourbigot, Serge, Fabien Carpentier und Michel Le Bras. „Thermal Degradation and Combustion Mechanism of EVA-Magnesium Hydroxide-Zinc Borate“. In ACS Symposium Series, 173–85. Washington, DC: American Chemical Society, 2001. http://dx.doi.org/10.1021/bk-2001-0797.ch014.

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5

Shen, Kelvin K., und T. Scott Griffin. „Zinc Borate as a Flame Retardant, Smoke Suppressant, and Afterglow Suppressant in Polymers“. In ACS Symposium Series, 157–77. Washington, DC: American Chemical Society, 1990. http://dx.doi.org/10.1021/bk-1990-0425.ch012.

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6

Jackson, William M. „Boroflux (Zinc Borate) Lower Cost Flux Systems: Reduce the Firing of Most Bodies to Cone 01“. In Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 10, Issue 1/2, 99–108. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470310526.ch15.

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7

Piskin, Mehmet Burcin, Nil Baran Acarali, Nurcan Tugrul, Emek Moroydor Derun und Ozlem Akgul. „A Study on the Hydrophobicity and Investigation of Physical and Chemical Properties of Produced Zinc Borate“. In Supplemental Proceedings, 373–77. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062173.ch46.

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8

„Physical, Optical and Structural Properties of Er3+ Doped Zinc/Cadmium Bismuth Borate/Silicate Glasses“. In Current Trends on Glass and Ceramic Materials, herausgegeben von Inder Pal, Ashish Agarwal, Sujata Sanghi und Mahender P. Aggarwal, 142–81. BENTHAM SCIENCE PUBLISHERS, 2013. http://dx.doi.org/10.2174/9781608054527113010010.

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9

Thirukumaran, M., K. Senthilkumar und R. Selvabharathi. „15 Effect of carbon nanotubes, aluminum hydroxide, and zinc borate on the mechanical and fire properties of epoxy nanocomposite“. In Nanocomposite and Nanohybrid Materials, 297–314. De Gruyter, 2023. http://dx.doi.org/10.1515/9783111137902-015.

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10

Banerjee, Diptonil, Amit Kumar Sharma und Nirmalya Sankar Das. „Basic Structures and Properties of Few Potential Nanomaterials“. In Nano Materials Induced Removal of Textile Dyes from Waste Water, 161–206. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815050295122010007.

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Annotation:
After the discussion of all the preceding sections/chapters, now we are in a position to review some typical nanomaterial systems that have established themselves as materials of immense potential in the field of water purification by successfully removing different textile dyes through different processes like catalysis adsorption or others. In this chapter, we will discuss a few such particular materials from different domains. The material will mainly include metal oxide nanostructures and related derivatives like zinc oxide, etc., and also carbon nanostructures like carbon nanotube, graphene, etc., and their hybrids. A detailed discussion regarding the dye removal ability of graphitic carbon nitride is also included here. In this regard, the results of other researchers will be accompanied by a few of our own findings, which will help the reader in better understanding the topic. Apart from these wellknown materials that have higher dye removal effectiveness, a few other less studied and newly evolved systems, such as silicon nanowire and p-type conducting oxides like copper borate, have also been discussed with a few established results.

Konferenzberichte zum Thema "Borate de zinc hydraté":

1

Gao, Pingqiang, Wenhua Song, Feng Ding und Xing Wang. „Synthesis of a new lamellar nano zinc borate“. In 2013 International Conference on Materials for Renewable Energy and Environment (ICMREE). IEEE, 2013. http://dx.doi.org/10.1109/icmree.2013.6893742.

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2

Shigihalli, N. B., R. Rajaramakrishna, R. V. Anavekar, Alka B. Garg, R. Mittal und R. Mukhopadhyay. „Optical Properties of Eu[sup 3+] Doped Lead Borate Tellurite and Zinc Borate Tellurite Glasses“. In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3605975.

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3

Hanamar, Kavita, B. G. Hegde, Kishor Upadhyaya und N. H. Ayachit. „Optical properties of samarium doped lithium zinc borate glasses“. In INTERNATIONAL CONFERENCE ON MULTIFUNCTIONAL MATERIALS (ICMM-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0019568.

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4

Rajaramakrishna, R., R. Lakshmikantha und R. V. Anavekar. „Elastic properties of Li+ doped lead zinc borate glasses“. In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872737.

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5

Prabhu, Nimitha S., und Sudha D. Kamath. „Green emission features of erbium doped lithium zinc borate glasses“. In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016896.

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6

Subhashini, Soumalya Bhattacharya, H. D. Shashikala und N. K. Udayashankar. „Synthesis and studies on microhardness of alkali zinc borate glasses“. In SOLID STATE PHYSICS: Proceedings of the 58th DAE Solid State Physics Symposium 2013. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4872742.

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Corbari, C., L. Chandru, I. C. S. Carvalho, O. Deparis, F. P. Mezzapesa, P. G. Kazansky und K. Sakaguchi. „2pm/V in Poled Bismuth-Zinc-Borate High Index Glass“. In 11th European Quantum Electronics Conference (CLEO/EQEC). IEEE, 2009. http://dx.doi.org/10.1109/cleoe-eqec.2009.5196591.

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Borodi, G., P. Pascuta, M. Bosca, R. Stefan, R. Tetean, V. Pop und D. Radulescu. „Magnetic behavior of erbium-zinc-borate glasses and glass ceramics“. In PROCESSES IN ISOTOPES AND MOLECULES (PIM 2013). AIP, 2013. http://dx.doi.org/10.1063/1.4833705.

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9

Mahajan, Rubby, Sandeep Kumar, Ram Prakash und Vinay Kumar. „Synthesis and luminescent properties of Sm3+ activated lithium zinc borate phosphor“. In NATIONAL CONFERENCE ON RECENT ADVANCES IN EXPERIMENTAL AND THEORETICAL PHYSICS (RAETP-2018). Author(s), 2018. http://dx.doi.org/10.1063/1.5051301.

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10

Bansal, Kamal, Saffi Rani, Nisha Rani, Gurjeet Singh und Sukhpal Singh. „Physical and radiation shielding properties of tantalum-zinc-sodium-borate glasses“. In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2020): 5th National e-Conference on Advanced Materials and Radiation Physics. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0052351.

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