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Journal articles on the topic 'Hydrophobic siloxane'

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Author: Grafiati

Published: 9 March 2023

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1

Santiago, A., A. González, J. J. Iruin, M. J. Fernández-Berridi, M. E. Muñoz, and L. Irusta. "Urethane/Siloxane Copolymers with Hydrophobic Properties." Macromolecular Symposia 321-322, no. 1 (December 2012): 150–54. http://dx.doi.org/10.1002/masy.201251126.

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2

Borsoi, Giovanni, Carlos Esteves, Inês Flores-Colen, and Rosário Veiga. "Effect of Hygrothermal Aging on Hydrophobic Treatments Applied to Building Exterior Claddings." Coatings 10, no. 4 (April 7, 2020): 363. http://dx.doi.org/10.3390/coatings10040363.

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Hydrophobic materials are among the most commonly used coatings for building exterior cladding. In fact, these products are easily applied to an existing surface, significantly reduce water absorption and have a minimal impact on the aesthetic properties. On the other hand, although these products have a proven effectiveness, their long-term durability to weathering has not yet been systematically studied and completely understood. For these reasons, this study aims to correlate the effect of artificial aging on the moisture transport properties of hydrophobic treatments when applied on building exterior claddings. Three hydrophobic products (an SiO2-TiO2 nanostructured dispersion; a silane/oligomeric siloxane; and a siloxane) were applied on samples of limestone and of a cement-based mortar. The moisture transport properties (water absorption, drying, water vapor permeability) of untreated and treated specimens were characterized. Furthermore, the long-term durability of the specimens was evaluated by artificial aging, that is, hygrothermal cycles (freeze–thaw and hot–cold). All treatments have significant hydrophobic effectiveness and improve the long term-durability of the treated specimens. However, the results showed that the three hydrophobic products have different effectiveness and durability, with the SiO2-TiO2 nanostructured dispersion being the most durable treatment on limestone, and the siloxane the most suitable for cementitious mortar.

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3

CHOJNOWSKI, JULIAN. "Controlled synthesis of siloxane-siloxane block copolymers containing hydrophilic and hydrophobic segments." Polimery 46, no. 07/08 (July 2001): 461–67. http://dx.doi.org/10.14314/polimery.2001.461.

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4

Mito-oka, Yasuko, Satoshi Horike, Yusuke Nishitani, Tadao Masumori, Munehiro Inukai, Yuh Hijikata, and Susumu Kitagawa. "Siloxane D4 capture by hydrophobic microporous materials." Journal of Materials Chemistry A 1, no. 27 (2013): 7885. http://dx.doi.org/10.1039/c3ta11217a.

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5

Manjencic, Darko, Jani Seitsonen, Tanja Radusin, Nevena Vukic, Jaroslava Budinski-Simendic, Jelena Cakic, and Ivan Ristic. "Influence of nanofillers on the properties of siloxane elastomers." Chemical Industry 74, no. 2 (2020): 133–46. http://dx.doi.org/10.2298/hemind191011011m.

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In this study, the influence of nanosilicon(IV)-oxide (with hydrophobic and hydrophilic functionalized surfaces) on the properties of siloxane elastomers was studied. The elastomers were prepared from vinyl and hydrogen oligosiloxanes, while the nanocomposites were obtained by addition of nanofillers at different concentrations (1, 5, 10 and 20 wt%). The chemical structure of the obtained materials was analyzed by Fourier transform infrared spectroscopy. Transmission electron microscopy confirmed good dispersion of the hydrophobic filler within the polymer matrix, while the hydrophilic filler formed a net on the siloxane sample. Type of the filler modification did not affect hardness of the siloxane hybrid materials, while the samples with the highest content of hydrophobic nanosilica have shown the highest value of tensile strength. Influence of the nanosilica type on thermal degradation of elastomeric materials was investigated by using thermogravimetric analysis, while the influence of the fillers on the phase transition temperature was analyzed by differential scanning calorimetry. Lower compatibility of the hydrophobic matrix and hydrophilic filler caused a decrease in the crystalline melting temperature with the lowest value determined for the sample with the highest filler loading. Increase in the nanofiller content resulted in the improved thermal stability of the obtained hybrid materials.

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6

Spaeth, Valerie, Jean Paul Lecomte, Marie Paule Delplancke, Jeanette Orlowsky, and Till Büttner. "Impact of Silane and Siloxane Based Hydrophobic Powder on Cement-Based Mortar." Advanced Materials Research 687 (April 2013): 100–106. http://dx.doi.org/10.4028/www.scientific.net/amr.687.100.

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Impact of the addition of silane and siloxane based hydrophobic powders on cement based mortar was studied. Effect of powder addition on mechanical properties and water absorption of cement based mortar is described. Impact of accelerated ageing, including UV radiation, and rain-sun cycles on hydrophobic performance was assessed, demonstrating excellent durability of silane-based hydrophobic performance.

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7

Racles, Carmen, Sergiu Shova, Maria Cazacu, and Daniel Timpu. "New highly ordered hydrophobic siloxane-based coordination polymers." Polymer 54, no. 22 (October 2013): 6096–104. http://dx.doi.org/10.1016/j.polymer.2013.09.001.

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8

Jitianu, Andrei, John Doyle, Glenn Amatucci, and Lisa C. Klein. "Methyl modified siloxane melting gels for hydrophobic films." Journal of Sol-Gel Science and Technology 53, no. 2 (October 13, 2009): 272–79. http://dx.doi.org/10.1007/s10971-009-2087-y.

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9

Dzunuzovic, Jasna, Marija Pergal, Vesna Vodnik, Milena Spírková, Rafał Poręba, and Slobodan Jovanovic. "Investigation of the morphology and surface properties of crosslinked poly(urethane-ester-siloxane)s." Chemical Industry 66, no. 6 (2012): 813–21. http://dx.doi.org/10.2298/hemind121004101d.

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Two series of crosslinked poly(urethane-ester-siloxane)s were synthesized from ?,?-dihydroxy-(ethylene oxide-poly(dimethylsiloxane)-ethylene oxide) (EO-PDMS-EO), 4,4?-methylenediphenyl diisocyanate and Boltorn? hyperbranched polyesters of the second and third pseudo generation, by a two-step polymerization in solution. The effect of the EO-PDMS-EO content and functionality of the applied crosslinking agent on the morphology and surface properties of the prepared poly(urethane-ester-siloxane)s was investigated by FTIR spectroscopy, small-angle X-ray scattering (SAXS), atomic force microscopy (AFM), scanning electron microscopy (SEM) and water absorption measurement. Different techniques (FTIR peak deconvolution, SAXS and AFM) revealed that decrease of the crosslinking agent functionality and EO-PDMS-EO content promotes microphase separation in the synthesized poly(urethane-ester-siloxane)s. SEM analysis and water absorption experiments showed that due to the hydrophobic character of EO-PDMS-EO and its ability to migrate to the surface of poly(urethane-ester-siloxane)s, samples synthesized with higher EO-PDMS-EO content and crosslinking agent of lower functionality have more hydrophobic surface and better waterproof performances. The obtained results indicate that the synthesis of poly(urethane-ester-siloxane)s based on EO-PDMS-EO and Boltorn? hyperbranched polyesters leads to the creation of networks with interesting morphological and surface properties, which can be easily tailored by changing the content of EO-PDMS-EO segment or functionality of hyperbranched polyester.

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10

El-Mahallawi, Iman, Engy Elshazly, Mohamed Ramadan, Reem Nasser, Moaaz Yasser, Seif El-Badry, Mahmoud Elthakaby, Olugbenga Timo Oladinrin, and Muhammad Qasim Rana. "Solar PV Panels-Self-Cleaning Coating Material for Egyptian Climatic Conditions." Sustainability 14, no. 17 (September 2, 2022): 11001. http://dx.doi.org/10.3390/su141711001.

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The electrical efficiency of photovoltaic panels is affected by many environmental parameters, which have a negative impact on system electrical efficiency and cost of energy, dust and increased panel temperatures being the most serious in the MENA region. In this work, a few organic-based self-cleaning coatings are developed, and their effects on PVs’ electrical efficiency re assessed for polycrystalline panels exposed to natural soiling conditions outdoors at El-Sherouk City. The results show that monolithic hydrophobic-based coatings using paraffine and dimethyl-siloxane show up to 14.3% improvement in the electrical efficiency of the PV panels, but the role of nanoparticles TiO2 and Al2O3 addition needs further investigation. Hydrophobic-based coatings using dimethyl-siloxane reduce the coated panels’ surface temperature compared with the uncoated panel.

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11

Kim, Dae-Yoon, Minwook Park, Sang-A. Lee, Soeun Kim, Chih-Hao Hsu, Namil Kim, Shiao-Wei Kuo, Tae-Ho Yoon, and Kwang-Un Jeong. "Hierarchical superstructures from a star-shaped molecule consisting of a cyclic oligosiloxane with cyanobiphenyl moieties." Soft Matter 11, no. 1 (2015): 58–68. http://dx.doi.org/10.1039/c4sm02239d.

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A star-shaped molecule synthesized by connecting four cyanobiphenyl mesogens to the periphery of a super-hydrophobic and ultra-flexible cyclic siloxane ring with hexyl chains formed hierarchical layered superstructures.

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12

Bogdanowicz, Krzysztof A., Michał Dutkiewicz, Hieronim Maciejewski, Marek Nowicki, Wojciech Przybył, Ireneusz Plebankiewicz, and Agnieszka Iwan. "Siloxane resins as hydrophobic self-cleaning layers for silicon and dye-sensitized solar cells: material and application aspects." RSC Advances 12, no. 30 (2022): 19154–70. http://dx.doi.org/10.1039/d2ra02698h.

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13

Zhu, Chunfang, Haitao Yang, Hongbo Liang, Zhengyue Wang, Jun Dong, Lei Xiong, Jianping Zhou, Junjun Ke, Xi Xu, and Weixian Xi. "A Novel Synthetic UV-Curable Fluorinated Siloxane Resin for Low Surface Energy Coating." Polymers 10, no. 9 (September 3, 2018): 979. http://dx.doi.org/10.3390/polym10090979.

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Low surface energy materials have attracted much attention due to their properties and various applications. In this work, we synthesized and characterized a series of ultraviolet (UV)-curable fluorinated siloxane polymers with various fluorinated acrylates—hexafluorobutyl acrylate, dodecafluoroheptyl acrylate, and trifluorooctyl methacrylate—grafted onto a hydrogen-containing poly(dimethylsiloxane) backbone. The structures of the fluorinated siloxane polymers were measured and confirmed by proton nuclear magnetic resonance and Fourier transform infrared spectroscopy. Then the polymers were used as surface modifiers of UV-curable commercial polyurethane (DR-U356) at different concentrations (1, 2, 3, 4, 5, and 10 wt %). Among three formulations of these fluorinated siloxane polymers modified with DR-U356, hydrophobic states (91°, 92°, and 98°) were obtained at low concentrations (1 wt %). The DR-U356 resin is only in the hydrophilic state at 59.41°. The fluorine and siloxane element contents were investigated by X-ray photoelectron spectroscopy and the results indicated that the fluorinated and siloxane elements were liable to migrate to the surface of resins. The results of the friction recovering assays showed that the recorded contact angles of the series of fluorinated siloxane resins were higher than the original values after the friction-annealing progressing.

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14

Kim, Hyeran, Kibeom Nam, and Dong Yun Lee. "Fabrication of Robust Superhydrophobic Surfaces with Dual-Curing Siloxane Resin and Controlled Dispersion of Nanoparticles." Polymers 12, no. 6 (June 25, 2020): 1420. http://dx.doi.org/10.3390/polym12061420.

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We developed a simple method for the fabrication of superhydrophobic surfaces on various substrates using spray coating. The fabrication method started with the blending of a modified hydrophobic siloxane binder, silica nanoparticles, and a volatile solvent by sonication. The mixture was spray-coated on various surfaces such as slide glass, paper, metal and fabric, forming a rough surface comprising silica particles dispersed in a hydrophobic binder. Surface hydrophobicity was affected by the surface energy of the binder and the degree of roughness. Therefore, we realized a superhydrophobic surface by controlling these two factors. The hydrophobicity of the siloxane binder was determined by the treatment of fluorine silane; the roughness was controlled by the amount of coated materials and sonication time. Thus, using the spray coating method, we obtained a superhydrophobic surface that was mechanically durable, thermally stable, and chemically resistant.

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15

KOZHUKHOVA, M. I., K. G. SOBOLEV, I. L. CHULKOVA, and V. V. STROKOVA. "Study on Stability of Water-Based Siloxane Hydrophobic Emulsions." Stroitel'nye Materialy 758, no. 4 (2018): 61–64. http://dx.doi.org/10.31659/0585-430x-2018-758-4-61-64.

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16

Blanco-Gomez, Gerald, Andrew Glidle, Leonard M. Flendrig, and Jonathan M. Cooper. "Creation of super-hydrophobic siloxane-modified SU-8 microstuctures." Microelectronic Engineering 86, no. 4-6 (April 2009): 1325–28. http://dx.doi.org/10.1016/j.mee.2008.11.069.

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17

Jiang, Zhen Lin, Chao Sheng Wang, Jia Lin Liu, Qiong Wang, Li Feng Li, and Shu Ying Fang. "Fabrication and Characterization of Polyorganosiloxane Superhydrophobic Film by Sol-Gel Method." Advanced Materials Research 482-484 (February 2012): 962–65. http://dx.doi.org/10.4028/www.scientific.net/amr.482-484.962.

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The polyorganosiloxane superhydrophobic film was fabricated via a sol-gel process followed by nano-silica(SiO2) sol and new organo-siloxane reagent 1,1,1,3,5,5,5-heptamethyl-3-[2-(trimethoxysilyl)-ethyl]-tri-siloxane(in brief as HPTETOs), the chemical structure of the polyorganosiloxane superhydrophobic were described by Fourier transform infrared spectroscopy (FT-IR), the superhydrophobic property of the treated sample was measured by contact angle (CA) measurements. It revealed that nano-silica and polyorganosiloxane formed 3D hydrophobic groups on the film; the film has turned its wetting property from hydrophilic to superhydrophobic with water contact angle of 143.7°.

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18

Noshadi, Iman, Baishali Kanjilal, Tahereh Jafari, Ehsan Moharreri, Nasser Khakpash, Ting Jiang, and Steven L. Suib. "Hydrophobic mesoporous adsorbent based on cyclic amine–divinylbenzene copolymer for highly efficient siloxane removal." RSC Advances 6, no. 81 (2016): 77310–20. http://dx.doi.org/10.1039/c6ra11382f.

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19

Ristić, Ivan, Darko Manjenčić, Marija Kostić, Nevena Vukić, Suzana Cakić, Tanja Radusin, and Vesna Teofilović. "Influence of nanofillers and masterbatch on properties of siloxane materials." Advanced Technologies 11, no. 2 (2022): 5–15. http://dx.doi.org/10.5937/savteh2202005r.

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Nanocomposites based on siloxane and silicon(IV)oxide nanoparticles (with a hydrophilic and hydrophobic surface) were synthesized to design the desired final properties of the composite material. Masterbatch, a mixture of siloxane containing vinyl functional groups and reinforcing fillers, was added to improve the mechanical properties and topology of siloxane networks. Silicon(IV)oxide was added in amounts of 1, 5, 10, and 20 wt% and masterbatch in amounts of 5 and 10 wt% to examine the effect of the amounts of fillers and masterbatch in the synthesized samples. Fourier transform infrared spectroscopy was used to analyze the chemical structure of the obtained materials. Transmission electron microscopy (TEM) was used to examine the dispersion of filler particles in siloxane nanocomposites. To examine the thermal stability and phase transition temperature of siloxane materials, thermogravimetric analyzes (TGA) and differential scanning calorimetry (DSC) were performed. The addition of masterbatch did not lead to a significant difference in melting temperature, but stoichiometry was disturbed, which decreased the thermal stability compared to samples without masterbatch. The addition of masterbatch to nanocomposites with hydrophilic fillers increases both elongations at break and tensile strength. According to the results, the combination of masterbatch and nanofillers affects the properties of siloxane materials, which could enable obtaining materials with the desired properties.

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20

Grabowsky, Simon, Jens Beckmann, and Peter Luger. "The Nature of Hydrogen Bonding Involving the Siloxane Group." Australian Journal of Chemistry 65, no. 7 (2012): 785. http://dx.doi.org/10.1071/ch11468.

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Variation of the Si–O–Si angle in siloxane compounds is a way to tune their basicity from highly hydrophobic systems at linear geometry to hydrophilic systems at small angles. This has great potential in the design of new siloxane materials with properties distinct from those of known silicones. We investigate hydrogen bonds with the siloxane linkage as an acceptor in a large range of Si–O–Si angles for the two hydrogen-bonded complexes disiloxane⋯silanol [(H3Si)2O⋯HOSiH3] and disiloxane⋯water [(H3Si)2O⋯HOH] with free disiloxane [H3SiOSiH3] as reference in a quantum-mechanical ab-initio study. Geometry, electron density, and the electron localizability indicator provide several complementary indicators of hydrogen bonding which show how Si–O–Si angle variation affects the nature and strength of these unusual hydrogen bonds.

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21

Liang, Lusheng, Naoyuki Shibayama, Haiying Jiang, Zilong Zhang, Lingyi Meng, Lianjie Zhang, Can Wang, et al. "Face-on oriented hydrophobic conjugated polymers as dopant-free hole-transport materials for efficient and stable perovskite solar cells with a fill factor approaching 85%." Journal of Materials Chemistry A 10, no. 7 (2022): 3409–17. http://dx.doi.org/10.1039/d1ta09991d.

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Siloxane-terminated polymers with low surface energy were studied as dopant-free HTMs in PSCs. The siloxane-terminated side-chains assisted the dissolution, tuning mobility, passivating perovskite defects and enhancing hydrophobicity of the polymer.

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22

Cheng, Xi Tao, Wen Hong Li, Cun She Zhang, and Yan Bai. "Synthesis and Application of Fluorosilicone Polymer." Advanced Materials Research 900 (February 2014): 365–77. http://dx.doi.org/10.4028/www.scientific.net/amr.900.365.

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The structure, properties, synthesis methods and application of siloxane fluorinated polyacrylate polymers,side chain fluorinated silicone polymer and fluoro-silicone block copolymers are discussed. Fluorosilicone polymers has excellent physical property such as low and high temperature resistance, hydrophobic oleophobic property, lubricity etc. It is an advanced material.

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23

Basu, Nandita, and Rabibrata Mukherjee. "Morphology modulation in evaporative drying mediated crystallization of sodium chloride solution droplet with surfactant." Soft Matter 14, no. 38 (2018): 7883–93. http://dx.doi.org/10.1039/c8sm01370e.

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We report the evaporative drying of aqueous droplet containing dilute NaCl solution on a hydrophobic substrate made of cross-linked poly-dimethyl siloxane (PDMS). We demonstrate that the deposition morphology drastically alters when an anionic surfactant, sodium dodecyl sulfate (SDS), is added into the salt-solutions.

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24

Soroceanu, Alina, and George T. Stiubianu. "Siloxane Matrix Molecular Weight Influences the Properties of Nanocomposites Based on Metal Complexes and Dielectric Elastomer." Materials 14, no. 12 (June 17, 2021): 3352. http://dx.doi.org/10.3390/ma14123352.

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Siloxane-based elastomers are some of the most sought-after materials for the construction of actuators and equipment for energy harvesting devices. This article focuses on changes of the mechanical (breaking stress, breaking strain, Young’s modulus) and dielectric properties for elastomers prepared with silicones, induced by the variation of molecular weight of the matrix, with three different silicone polymers having 60,000 g/mol, 150,000 g/mol, and 450,000 g/mol (from GPC measurements). Multiple siloxane elastomers were crosslinked with methyltriacetoxysilane using the sol-gel route. The dielectric permittivity values of the elastomers were also enhanced with two different complex structures containing siloxane bond and 3d transition metals as filler materials for polydimethylsiloxane polymers with various molecular weights. The dielectric spectroscopy tests demonstrated a small decrease (5%) for the values of the dielectric permittivity in relation to increased molecular weight of the siloxane polymer, both for samples prepared with pure polymer and for samples with metal complexes. The samples of nanocomposites showed a >50% increase of dielectric permittivity values relative to samples prepared of pure siloxane elastomer. The thermal tests demonstrated that the nanocomposites retained thermal stability similar with samples prepared of pure siloxane elastomer. The behavior under controlled conditions of humidity showed a trend of increased water vapor sorption with increasing molecular weight but an overall hydrophobic stable character of nanocomposites.

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25

Ganicz, Tomasz, and Krystyna Rozga-Wijas. "Siloxane-Starch-Based Hydrophobic Coating for Multiple Recyclable Cellulosic Materials." Materials 14, no. 17 (August 31, 2021): 4977. http://dx.doi.org/10.3390/ma14174977.

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The results of the application of a new hydrophobization agent based on a triethoxymethylsilane and standard starch aqueous mixture for mass-produced cellulosic materials—printing paper, paperboard, and sack paper—have been evaluated to examine whether such a mixture can be used in industrial practice. The application of this agent on laboratory sheets prepared in a repetitive recycling process was performed to investigate its influence on the formation and properties of the products, as well as the contamination of circulating water. Measurements of the water contact angle, Cobb tests, and water penetration dynamics (PDA) were performed to test the barrier properties of the resulting materials. The effects of the applied coatings and recycling process on the paper’s tensile strength, tear index, roughness, air permeance, and ISO brightness were studied. Studies have proven that this formulation imparts relatively high surface hydrophobicity to all materials tested (contact angles above 100°) and a significant improvement in barrier properties while maintaining good mechanical and optical performance. The agent also does not interfere with the pulping and re-forming processes during recycling and increases circulation water contamination to an acceptable degree. Attenuated total reflectance Fourier-transform infrared (FT-IR) spectra of the paper samples revealed the presence of a polysiloxane network on the surface.

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26

Polizos, Georgios, Enis Tuncer, Xiaofeng Qiu, Tolga Aytuǧ, Michelle K. Kidder, Jamie M. Messman, and Isidor Sauers. "Nonfunctionalized Polydimethyl Siloxane Superhydrophobic Surfaces Based on Hydrophobic−Hydrophilic Interactions." Langmuir 27, no. 6 (March 15, 2011): 2953–57. http://dx.doi.org/10.1021/la1042712.

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27

Verma, Garima, S. K. Dhoke, and A. S. Khanna. "Polyester based-siloxane modified waterborne anticorrosive hydrophobic coating on copper." Surface and Coatings Technology 212 (November 2012): 101–8. http://dx.doi.org/10.1016/j.surfcoat.2012.09.028.

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28

Milanesi, F., G. Cappelletti, R. Annunziata, C. L. Bianchi, D. Meroni, and S. Ardizzone. "Siloxane−TiO2 Hybrid Nanocomposites. The Structure of the Hydrophobic Layer." Journal of Physical Chemistry C 114, no. 18 (April 12, 2010): 8287–93. http://dx.doi.org/10.1021/jp1014669.

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29

Cappelletto, Elisa, Emanuela Callone, Renzo Campostrini, Fabrizio Girardi, Simona Maggini, Claudio della Volpe, Stefano Siboni, and Rosa Di Maggio. "Hydrophobic siloxane paper coatings: the effect of increasing methyl substitution." Journal of Sol-Gel Science and Technology 62, no. 3 (March 24, 2012): 441–52. http://dx.doi.org/10.1007/s10971-012-2747-1.

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30

Lucquiaud, V., L. Courard, O. Gérard, F. Michel, M. Handy, S. Aggoun, and A. Cousture. "Evaluation of the Durability of Hydrophobic Treatments on Concrete Architectural Heritage." Restoration of Buildings and Monuments 20, no. 6 (December 1, 2014): 395–404. http://dx.doi.org/10.1515/rbm14.20.6-0038.

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Abstract The protection of historical concrete structures is a challenge for the coming years. Hydrophobic treatment may reduce the deterioration process while providing protection against water penetration. Existing commercial products - mainly silane or siloxane in either water or solvent based formulations - were submitted to different ageing processes including UV radiation, dry-wet cycles, thermal shocks, freeze-thaw cycles, carbonation and their effectiveness has been evaluated on the basis of contact angle, vapour and chloride permeability and, capillarity water absorption. The results obtained clearly show that hydrophobic treatments display a good behaviour under the main ageing conditions.

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31

Chen, Yifei, Ruixing Wang, Haochuan Wang, Fan Hu, and Peng Jin. "Study on PVA-siloxane mixed emulsion coatings for hydrophobic cement mortar." Progress in Organic Coatings 147 (October 2020): 105775. http://dx.doi.org/10.1016/j.porgcoat.2020.105775.

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32

Zhan, Weiquan, Hao Yi, Shaoxian Song, Yunliang Zhao, and Feng Rao. "Hydrophobic agglomeration behaviors of clay minerals as affected by siloxane structure." Colloids and Surfaces A: Physicochemical and Engineering Aspects 568 (May 2019): 36–42. http://dx.doi.org/10.1016/j.colsurfa.2019.01.061.

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33

Al-Kalbani, Mohammed Saif, Peter Cookson, and Hayder Abdel Rahman. "Uses of Hydrophobic Siloxane Polymer (Guilspare®) for Soil Water Management." Water International 28, no. 2 (June 2003): 217–23. http://dx.doi.org/10.1080/02508060308691687.

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34

Żółtowska, Sonia, Jozef Mitterpach, Přemysl Šedivka, Lukáš Jeroušek, and Miloš Pánek. "Outdoor efficacy of additional hydrophobic treatment of weathered wood by siloxane." Construction and Building Materials 360 (December 2022): 129134. http://dx.doi.org/10.1016/j.conbuildmat.2022.129134.

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35

Ferrara, Liberato, and Andrea Pattarini. "Siloxanes in Concrete: From Manual Application of Water-Proofing Treatments to Mix-Design Addition for Concrete Hydrophobicity." Key Engineering Materials 711 (September 2016): 263–68. http://dx.doi.org/10.4028/www.scientific.net/kem.711.263.

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Manually applied waterproofing treatments with siloxane based emulsions are quite common for slabs exposed to rain and/or ponding water. This study has started first of all with the assessment of such a manually applied treatment, employing a commercially available siloxane based product. Reference has been made to capacity of such a treatment to reduce capillary absorption of water both in the case of un-cracked and cracked normal strength concrete specimens. The study has further evolved showing the potential of the siloxane based emulsion, when added into the mix as a partial replacement of the total mixing water (10% by weight in this case) to create a hydrophobic concrete, featuring highly reduced values of capillary absorption of water, even without the manual application of any surface treatment. The obtained results are interesting and very promising and pave the way to spread the use of such a simple technology for improving the durability characteristics of the concrete imperviousness, which would be no longer subjected e.g. to the UV light induced aging and deterioration of the manually applied films.

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36

Redkina, Galina V., Alexandra S. Sergienko, Yurii I. Kuznetsov, and Oleg Yu Grafov. "Superhydrophobic Anticorrosive Phosphonate–Siloxane Films Formed on Zinc with Different Surface Morphology." Materials 15, no. 15 (August 4, 2022): 5360. http://dx.doi.org/10.3390/ma15155360.

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The composition, structure, and protective and hydrophobic properties of nanoscale films formed layer-by-layer in solutions of sodium dodecylphosphonate (SDDP) and vinyltrimethoxysilane or n-octyltriethoxysilane (OTES) on the zinc surface with different morphologies were studied by SEM, XPS, water contact angle measurements, and electrochemical and corrosion tests. The protective, hydrophobic properties of phosphonate–siloxane films on zinc and their stability in a corrosive media are determined both by the initial surface morphology and composition of the surface oxide layer, and by the nature of inhibitors. It was shown that preliminary laser texturing of the zinc surface is preferable than chemical etching to enhance the anticorrosive properties of the resulting thin films. The most stable films with excellent superhydrophobic and protective properties in atmospheres of high humidity and salt spray are formed on the zinc surface with fractal morphology during layer-by-layer passivation with SDDP and OTES.

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Terpilowski, Konrad, Olena Goncharuk, and Vladimir M. Gun’ko. "Macro and micro wettability of hydrophobic siloxane films with hierarchical surface roughness." Smart Materials and Structures 27, no. 7 (May 29, 2018): 075002. http://dx.doi.org/10.1088/1361-665x/aac243.

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Ruan, Siyuan, Xiuting Li, and Tao Jiang. "Hydrophilic-hydrophobic poly(dimethyl siloxane)-based SERS substrate with internal Raman signaling." Materials Chemistry and Physics 255 (November 2020): 123582. http://dx.doi.org/10.1016/j.matchemphys.2020.123582.

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Lin, Wensheng, Yudong Huang, Jian Li, Zhongqi Liu, Wenbin Yang, Ran Li, Hanxian Chen, and Xinxiang Zhang. "Preparation of highly hydrophobic and anti-fouling wood using poly(methylhydrogen)siloxane." Cellulose 25, no. 12 (October 12, 2018): 7341–53. http://dx.doi.org/10.1007/s10570-018-2074-y.

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40

Corcione, Carola Esposito, and Mariaenrica Frigione. "Surface characterization of novel hydrophobic UV-vurable siloxane-modified methacrylate/boehmite nanocomposites." Polymer Composites 34, no. 9 (March 5, 2013): 1546–52. http://dx.doi.org/10.1002/pc.22424.

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41

Talalay, P. G. "Dimethyl siloxane oils as an alternative borehole fluid." Annals of Glaciology 47 (2007): 82–88. http://dx.doi.org/10.3189/172756407786857785.

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AbstractFinding a new safe and ecologically friendly borehole fluid is one of the most pressing problems for forthcoming ice-drilling projects. Not all recent borehole fluids qualify as intelligent choices from safety, environmental and other technological standpoints. We propose the use of silicone oils as the borehole fluid. The most suitable type of silicone oils for deep ice drilling are low-molecular (or volatile) dimethyl siloxane oils (DSOs). Low-molecular DSOs are clear, water-white, tasteless, odorless, neutral liquids. They are hydrophobic and inert substances that are stable to water, air, oxygen, metals, wood, paper, plastics, etc. Of the DSOs, class 2 grades of KF96-1.5cs and KF96-2.0cs most fully fit our criteria for choice as borehole fluids. The final conclusion as to the suitability of DSOs for ice deep drilling will be made after the experiments in a test borehole.

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42

Stefanovic, Ivan, Dejan Godjevac, Milena Spírková, Petar Jovancic, Vele Tesevic, Vesna Milacic, and Marija Pergal. "Impact of the poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) macrodiols on the surface related properties of polyurethane copolymers." Chemical Industry 70, no. 6 (2016): 725–38. http://dx.doi.org/10.2298/hemind151127009s.

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Segmented thermoplastic polyurethane copolymers (PURs) were synthesized using 4,4'-methylenediphenyl diisocyanate and 1,4-butanediol as the hard segment and ?,?-dihydroxy-poly(propylene oxide)-b-poly(dimethylsiloxane)-b-poly(propylene oxide) (PPO-PDMS) as the soft segment. The content of incorporated soft segments in PURs varied in the range from 40 to 90 wt.%. The structure, molecular weights and crystallinity of obtained copolymers were monitored by FTIR, 1H, 2D NMR spectroscopy, GPC and DSC analysis, respectively. Surface free energy analysis indicates the presence of hydrophobic (siloxane) groups on the surface, giving highly hydrophobic nature to the obtained PURs films. Water absorption measurements showed that the increase of the hydrophobic PPO-PDMS segment content, led to the decrease of percentage of absorbed water in copolymers. SEM and AFM analysis revealed that copolymers with lower content of PPO-PDMS segments have higher microphase separation between segments. The results obtained in this work indicate that synthesized PURs based on PPO-PDMS, demonstrated proper surface and morphological properties with a great potential for variety of applications such as hydrophobic coatings in biomedicine.

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Wu, Guomin, Di Liu, Jian Chen, Guifeng Liu, and Zhenwu Kong. "Preparation and properties of super hydrophobic films from siloxane-modified two-component waterborne polyurethane and hydrophobic nano SiO2." Progress in Organic Coatings 127 (February 2019): 80–87. http://dx.doi.org/10.1016/j.porgcoat.2018.06.016.

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Talianov, Pavel M., Oleksii O. Peltek, Mikhail A. Masharin, Soslan Khubezhov, Mikhail A. Baranov, Audrius Drabavičius, Alexander S. Timin, et al. "Water-stable halide perovskite nanocrystals in biological environment." Journal of Physics: Conference Series 2015, no. 1 (November 1, 2021): 012150. http://dx.doi.org/10.1088/1742-6596/2015/1/012150.

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Abstract Tetramethyl orthosilicate and triethoxyphenylsilane, which contains hydrophobic phenyl groups, were used as a silica (SiO2) source in a modified ligand-assisted reprecipitation synthesis approach for the fabrication of water-stable perovskite nanocrystals. Hydrolysis-condensation reaction of tetramethyl orthosilicate and triethoxyphenylsilane results in a formation of 3D siloxane network. Employing triethoxyphenylsilane in the synthesis enhances the hydrophobic properties of the SiO2 shell, which increases the stability of perovskites in aqueous medium. The stability of the CsPbBr3@SiO2 nanocrystals was estimated after 24 h of water exposure by the photoluminescence measurements at different time points. The synthesized CsPbBr3@SiO2 nanocrystals were visualized during in vitro experiments with murine melanoma B16-F10 cells. Hence, the potential of CsPbBr@SiO2 nanocrystals for bioimaging purposes was observed.

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Uritu, Cristina M., Manuela Calin, Stelian S. Maier, Corneliu Cojocaru, Alina Nicolescu, Dragos Peptanariu, Cristina Ana Constantinescu, Daniela Stan, Mihail Barboiu, and Mariana Pinteala. "Flexible cyclic siloxane core enhances the transfection efficiency of polyethylenimine-based non-viral gene vectors." Journal of Materials Chemistry B 3, no. 42 (2015): 8250–67. http://dx.doi.org/10.1039/c5tb01342a.

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Jindasuwan, Sunisa, and Sitthisuntorn Supothina. "Hydrophobic and Oleophilic Filter Paper for Oil/Water Separation." Key Engineering Materials 798 (April 2019): 385–90. http://dx.doi.org/10.4028/www.scientific.net/kem.798.385.

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The separation of oil from water is significance for environmental de-pollution application. To obtain selectivity of liquid, filter papers were coated to bear highly hydrophobic and oleophilic functionality that can allow only oils to pass through them. The coating solutions were prepared by mixing poly(methylhydro siloxane, PMHS) and fumed silica at various proportions. To determine an optimum coating condition, properties of the treated filter papers were investigated by measuring water contact angle and surface free energy, examining surface morphology and testing for selective removal of diesel oil from water. The optimum coating solution was at the PMHS:fumed silica weight ratio of 1.25:1.00. The treated filter paper exhibited high hydrophobicity with water contact angle of 142.80 ± 0.36 degrees and surface free energy of 0.78 mJ/m2. In addition, it exhibited high selective removal of diesel oil from water with oil absorption capacity of 2.3 g/g.

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Chen, Jingbing, Yunyun Ma, Huiping Lin, Qingzhu Zheng, Xinxiang Zhang, Wenbin Yang, and Ran Li. "Fabrication of Hydrophobic ZnO/PMHS Coatings on Bamboo Surfaces: The Synergistic Effect of ZnO and PMHS on Anti-Mildew Properties." Coatings 9, no. 1 (December 28, 2018): 15. http://dx.doi.org/10.3390/coatings9010015.

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Poor mildew resistance has limited the application of bamboo materials. In this work, ZnO/PMHS coatings were fabricated on bamboo timber surfaces by hydrothermal synthesis method and hydrophobic modification with poly(methylhydrogen)siloxane (PMHS). The surface chemical characteristics and microstructure of the bamboo before and after modification were investigated using Fourier transform infrared spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, and water contact angle (WCA). The morphology results indicated that ZnO on the surface of bamboo forms flower-like aggregations. The WCA of ZnO/bamboo increased from 65° to 142° after PMHS hydrophobic modification, indicating that the hydrophobicity of bamboo was significantly improved. The original bamboo had poor anti-mildew properties when exposed to Trichoderma viride, Aspergillus niger, and Penicillium citrinum. After depositing ZnO onto the surface of the bamboo, the anti-mildew properties were significantly improved. Furthermore, it was found that after PMHS hydrophobic modification, ZnO/bamboo had excellent anti-mildew properties when exposed to the three mold hyphae, which indicated that PMHS hydrophobic modification had a synergistic effect on the anti-mildew properties of bamboo with a ZnO coating.

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Di Mundo, Rosa, Claudia Labianca, Giuseppe Carbone, and Michele Notarnicola. "Recent Advances in Hydrophobic and Icephobic Surface Treatments of Concrete." Coatings 10, no. 5 (May 5, 2020): 449. http://dx.doi.org/10.3390/coatings10050449.

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In this review, we present a survey on hydrophobic surface treatments of concrete, important protection tools against deterioration and corrosion phenomena. In the frame of a standardized distinction in coatings, pore blockage, and impregnation methods, we highlight the huge variety of compounds and formulations utilized, and the different performances reached in terms of water contact angle, water absorption, chloride penetration, and, rarely reported, anti-icing/icephobic action. Our view covers the spectrum of the surface treatments, but also makes a comparison with hydrophobic bulk modifications of concrete, procedures often utilized as well; further, novel proposals of more sustainable routes are presented. We note that coating and impregnation, preferably when based on polyurethane and silane/siloxane, respectively, appear more effective against water ingress. The achieved wetting character is hydrophobic or, at most, overhydrophobic. Superhydrophobic coatings for concrete have been obtained by embedding nano-powders in hydrophobic emulsions, allowing to add a nanotexture to the preexisting complex roughness of the material. Concrete treated with this type of coating has also recently shown a pronounced icephobic character, a parameter that goes beyond the freeze–thaw characterization usually conducted on cement-based materials.

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Soulios, Vasilis, Ernst Jan de Place Hansen, and Hans Janssen. "Hygric properties of hydrophobized building materials." MATEC Web of Conferences 282 (2019): 02048. http://dx.doi.org/10.1051/matecconf/201928202048.

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Moisture loads due to wind-driven rain can lead to accelerated decay of exposed building facades. Hydrophobic impregnation reduces water absorption of facade materials and is thus presumed to decrease moisture related damages. Hydrophobic impregnation however also lowers the drying speed of the exposed facade, leaving mainly water vapour transfer to take place. This study examines the open porosity and capillary absorption coefficient of impregnated brick samples as well as the effect of hydrophobic impregnation on the vapour permeability of brick and mortar samples. The open porosity was measured with vacuum saturation test, the absorption coefficient was determined by water uptake tests, both done after one month of curing of the impregnated brick samples. The vapour permeability was `derived from cup tests and from drying tests. The resulting open porosity from brick samples indicates that the changes in the overall pore structure are minimal after impregnation. In addition, the absorption coefficient of brick was found to be fairly close to zero, even with low concentrations of active ingredient, and regardless the percentage of silane/siloxane. Our findings support the claim that the hydrophobic impregnation does not influence significantly the water vapour permeability of brick and mortar.

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Wu, Buyong, Lin Ye, and Xiaowen Zhao. "Construction of robust siloxane coating for urea-formaldehyde foam and durable hydrophobic mechanism." Composites Part A: Applied Science and Manufacturing 122 (July 2019): 96–106. http://dx.doi.org/10.1016/j.compositesa.2019.04.025.

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