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Letteratura scientifica selezionata sul tema "Omniphobie"

Autore: Grafiati

Pubblicato: 24 giugno 2022

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Articoli di riviste sul tema "Omniphobie"

Sadri, Behnam, Debkalpa Goswami e Ramses Martinez. "Rapid Fabrication of Epidermal Paper-Based Electronic Devices Using Razor Printing". Micromachines 9, n. 9 (22 agosto 2018): 420. http://dx.doi.org/10.3390/mi9090420.

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This work describes the use of a benchtop razor printer to fabricate epidermal paper-based electronic devices (EPEDs). This fabrication technique is simple, low-cost, and compatible with scalable manufacturing processes. EPEDs are fabricated using paper substrates rendered omniphobic by their cost-effective silanization with fluoroalkyl trichlorosilanes, making them inexpensive, water-resistant, and mechanically compliant with human skin. The highly conductive inks or thin films attached to one of the sides of the omniphobic paper makes EPEDs compatible with wearable applications involving wireless power transfer. The omniphobic cellulose fibers of the EPED provide a moisture-independent mechanical reinforcement to the conductive layer. EPEDs accurately monitor physiological signals such as ECG (electrocardiogram), EMG (electromyogram), and EOG (electro-oculogram) even in high moisture environments. Additionally, EPEDs can be used for the fast mapping of temperature over the skin and to apply localized thermotherapy. Our results demonstrate the merits of EPEDs as a low-cost platform for personalized medicine applications.

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Wang, Yubo, Qiang Guo, Zhen Li, Jingfeng Li, Ruimin He, Kaiyang Xue e Shuqin Liu. "Preparation and Modification of PVDF Membrane and Study on Its Anti-Fouling and Anti-Wetting Properties". Water 14, n. 11 (26 maggio 2022): 1704. http://dx.doi.org/10.3390/w14111704.

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Membrane distillation (MD) has unique advantages in the treatment of high-salt wastewater because it can make full use of low-grade heat sources. The high salinity mine water in western mining areas of China is rich in Ca2+, Mg2+, SO42− and HCO3−. In the MD process, the inorganic substances in the feed will cause membrane fouling. At the same time, low surface tension organic substances which could be introduced in the mining process will cause irreversible membrane wetting. To improve the anti-fouling and anti-wetting properties of the membrane, the PVDF omniphobic membrane in this paper was prepared by electrospinning. The water contact angle (WCA) can reach 153°. Direct contact membrane distillation (DCMD) was then used for treating high-salinity mine water. The results show that, compared with the unmodified membranes, the flux reduction rate of the omniphobic membrane was reduced by 34% in 20 h, showing good anti-fouling property. More importantly, the omniphobic membrane cannot be wetted easily by the feed containing 0.3 mmol/L SDS. The extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory was used to analyze the free energy of the interface interaction between the membrane and pollutants, aiming to show that the omniphobic membrane was more difficult to pollute. The result was consistent with the flux variation in the DCMD process, providing an effective basis for explaining the mechanism of membrane fouling and membrane wetting.

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Hensel, René, Christoph Neinhuis e Carsten Werner. "The springtail cuticle as a blueprint for omniphobic surfaces". Chemical Society Reviews 45, n. 2 (2016): 323–41. http://dx.doi.org/10.1039/c5cs00438a.

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Khan, Fahad, Ajmir Khan, Mohammad O. Tuhin, Muhammad Rabnawaz, Zhao Li e Muhammad Naveed. "A novel dual-layer approach towards omniphobic polyurethane coatings". RSC Advances 9, n. 46 (2019): 26703–11. http://dx.doi.org/10.1039/c9ra04923a.

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Jamil, Muhammad Imran, Lina Song, Juan Zhu, Numan Ahmed, Xiaoli Zhan, Fengqiu Chen, Dangguo Cheng e Qinghua Zhang. "Facile approach to design a stable, damage resistant, slippery, and omniphobic surface". RSC Advances 10, n. 33 (2020): 19157–68. http://dx.doi.org/10.1039/d0ra01786h.

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Tuteja, A., W. Choi, J. M. Mabry, G. H. McKinley e R. E. Cohen. "Robust omniphobic surfaces". Proceedings of the National Academy of Sciences 105, n. 47 (10 novembre 2008): 18200–18205. http://dx.doi.org/10.1073/pnas.0804872105.

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Lu, Yao, Guanjie He, Claire J. Carmalt e Ivan P. Parkin. "Synthesis and characterization of omniphobic surfaces with thermal, mechanical and chemical stability". RSC Advances 6, n. 108 (2016): 106491–99. http://dx.doi.org/10.1039/c6ra20392b.

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Davis, Alexander, Elisa Mele, José Alejandro Heredia-Guerrero, Ilker S. Bayer e Athanassia Athanassiou. "Omniphobic nanocomposite fiber mats with peel-away self similarity". Journal of Materials Chemistry A 3, n. 47 (2015): 23821–28. http://dx.doi.org/10.1039/c5ta06333g.

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Falcón García, Carolina, Felix Stangl, Alexandra Götz, Weining Zhao, Stephan A. Sieber, Madeleine Opitz e Oliver Lieleg. "Topographical alterations render bacterial biofilms susceptible to chemical and mechanical stress". Biomaterials Science 7, n. 1 (2019): 220–32. http://dx.doi.org/10.1039/c8bm00987b.

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Snyder, Sarah A., Mathew Boban, Chao Li, J. Scott VanEpps, Geeta Mehta e Anish Tuteja. "Lysis and direct detection of coliforms on printed paper-based microfluidic devices". Lab on a Chip 20, n. 23 (2020): 4413–19. http://dx.doi.org/10.1039/d0lc00665c.

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This article presents an integrated microfluidic coliform lysis and detection device featuring customizable omniphilic regions created by direct printing of omniphilic channels on an omniphobic, fluorinated paper.

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Più fonti

Tesi sul tema "Omniphobie"

Barret-Vivin, Virgile. "Revêtements hybrides pour la protection de matériaux composites". Electronic Thesis or Diss., Paris 6, 2016. http://www.theses.fr/2016PA066756.

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Le but de ce travail de thèse est de répondre à l'obsolescence programmé d'un film polymère fluoré utilisé dans l'industrie aéronautique et commercialisé par Dupont de Nemours : le Tedlar®. Pour ce faire nous avons étudié plusieurs matrices à réseau inorganique synthétisées par voie sol-gel et plus particulièrement une matrice silicique contenant un précurseur à longues chaînes fluorées. En ajoutant dans ces formulations des charges à la fois microniques et nanométriques, il a été possible d'obtenir des films superhydrophobes et lipophobes mis en forme par pulvérisation. Afin de répondre plus particulièrement au cahier des charges imposé, une seconde matrice hybride à composante polymère à été étudiée. Ces nouveaux films, photo-activés par l'intermédiaire de photoamorceurs de polymérisation et d'acides photogénérés, ont permis d'obtenir des propriétés mécaniques et de gonflement (caractérisées par nanoindentation et ellipsométrie) adéquates. La polymérisation des fonctions mehtacrylates a été suivie par RMN solide du carbone ainsi que par infrarouge. La condensation inorganique l'a été par RMN solide du silicium. La création d'un réseau interpénétré organique / minéral ainsi que la présence de fluor à la surface et dans le volume des films à permis l'obtention de couches ayant des propriétés barrières très intéressantes
The main purpose of this thesis was to provide an alternative to replace a fluorinated polymer film used in the aerospace industry (commercialized by Dupont de Nemours): the Tedlar®. To that end, several inorganic network based films have been studied. They have been synthesized by sol-gel chemistry. We furthermore investigated the behavior of a silica based matrix containing a perfluorinated organosilane. By adding in the mixture some nano and micro-particles, the spray-obtained films exhibit exceptional dewetting properties. In addition to their super hydrophobic behavior, those films are also lipophobic. To achieve all the specifications this project needs, a second matrix, involving an interpenetrated organic / inorganic framework, has been studied. These new films, which are UV-light initiated, showed very good properties: we characterized the mechanical ones by nano-indentation while the swelling of these coatings and their barrier properties have been examined by ellipsometry. The inorganic densification has been monitored by solid state 29Si NMR MAS and the organic polymerization by FTIR, 1H and 19F liquid RMN and 13C solid NMR. The creation of an hybrid network with fluorine at the surface and in the width of the films has permit to obtain coatings with all the requirements of our specification need

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Hensel, René. "Robust omniphobic surfaces by mimicking the springtail skin morphology". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-149179.

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Springtails (Collembola) are wingless arthropods that are impressively adapted to cutaneous respiration in temporarily rain-flooded habitats by non-wetting skin morphology. Recapitulating the robust and effectively liquid-repellent surface characteristics of springtail skin in engineered materials may offer exciting opportunities for demanding applications. Herein, we present a strategy for mimicking morphological surface features of springtail skin in polymer membranes produced by reverse imprint lithography. We report the fabrication of multi-level silicon masters that, in turn, serve as templates for the replication of flexible polymer membranes. We examined the robust wetting characteristics of polymer membranes by in situ plastron collapse tests and condensation tests. The mechanical stability of the polymer membranes was tested using a tribometer set-up and compared with needle-shaped pillar structures made from similar material. The fabricated membranes are flexible, free-standing, and adaptable to various substrate materials and shapes that allow for emerging applications.

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Hensel, René, Christoph Neinhuis e Carsten Werner. "The springtail cuticle as a blueprint for omniphobic surfaces". Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-188134.

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Omniphobic surfaces found in nature have great potential for enabling novel and emerging products and technologies to facilitate the daily life of human societies. One example is the water and even oilrepellent cuticle of springtails (Collembola). The wingless arthropods evolved a highly textured, hierarchically arranged surface pattern that affords mechanical robustness and wetting resistance even at elevated hydrostatic pressures. Springtail cuticle-derived surfaces therefore promise to overcome limitations of lotus-inspired surfaces (low durability, insufficient repellence of low surface tension liquids). In this review, we report on the liquid-repellent natural surfaces of arthropods living in aqueous or temporarily flooded habitats including water-walking insects or water spiders. In particular, we focus on springtails presenting an overview on the cuticular morphology and chemistry and their biological relevance. Based on the obtained liquid repellence of a variety of liquids with remarkable efficiency, the review provides general design criteria for robust omniphobic surfaces. In particular, the resistance against complete wetting and the mechanical stability strongly both depend on the topographical features of the nano- and micropatterned surface. The current understanding of the underlying principles and approaches to their technological implementation are summarized and discussed.

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Park, Kyoo Chul. "A study of static and dynamic robustness of hydro/omniphobic surfaces". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/62534.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 107-110).
Liquid droplets in the Cassie-Baxter state form liquid-air interfaces that are not flat but distorted due to pressure differences across the interfaces between the asperities. These distorted interfaces play an essential role in the transition from the composite Cassie-Baxter state to the fully-wetted Wenzel state and in the determination of the robustness of the composite state. As well as the static pressure difference due to the Laplace pressure, dynamic pressure difference due to various configurations including drop impact is also a source that causes the transition with the distorted interfaces. However, there are few experimental and numerical studies that consider the details of the distorted interfaces for a wide range of liquids and there is a lack of an apriori method to evaluate the robustness of three-dimensionally complicated textures. In addition, previous studies on drop impact pressure did not cover the maximum pressure at impact in the range of low velocities (< 2 m/s). We have first investigated the shape of distorted liquid-air interfaces and their transition conditions experimentally by using droplets of various low surface tension liquids on millimeter-sized re-entrant surface topography. For the dynamic pressure difference, we proposed a modified water hammer pressure formula and compared with the experiment using a high speed camera. The static experimental results by using three dimensionally printed millimetric structures are in good agreement with our newly-developed finite element simulations. I These three-dimensional simulations of the interfacial shape provide a predictive tool for the robustness of a wide range of proposed micro-texture in terms of the breakthrough pressure at which the distorted liquid-air interface infiltrate into the space between asperities and the droplet transitions to the Wenzel state. The dynamic experimental results open a broad avenue to a novel approach to delve into the dynamic breakthrough pressure of droplets of a variety of liquids.
by Kyoo Chul Park.
S.M.

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Hensel, René [Verfasser], Carsten [Akademischer Betreuer] Werner e Thomas [Akademischer Betreuer] Speck. "Robust omniphobic surfaces by mimicking the springtail skin morphology / René Hensel. Gutachter: Carsten Werner ; Thomas Speck. Betreuer: Carsten Werner". Dresden : Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2014. http://d-nb.info/1068447745/34.

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Perry, Guillaume. "Contribution à la réalisation de dispositifs microfluidiques à base d’électromouillage pour la détection SPR". Thesis, Lille 1, 2012. http://www.theses.fr/2012LIL10104/document.

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Ces travaux de thèse ont porté sur l’étude de solutions originales pour limiter la biopollution dans des systèmes microfluidiques à base d'électromouillage (EWOD) couplés à un biocapteur à résonance de plasmons de surface (SPR). Deux approches complémentaires ont été étudiées. Dans un premier temps nous avons mis à profit la forte adsorption de protéines sur des nanofeuillets d'oxyde de graphène (GO): les caractérisations de mouillage de solutions contenant un mélange de GO et de protéines (albumine sérique bovine - BSA) ont permis de montrer que le GO maintenait en suspension les protéines en évitant leur adsorption sur la surface. Le résultat le plus remarquable obtenu concerne le déplacement par EWOD de BSA, à une concentration de 195ng/µL (pour 500ng/µL de GO), 30 fois plus que ce qu’il est possible de transporter sans GO. Nous avons montré que la présence des feuillets de GO n’altère pas l’activité enzymatique. Une autre solution a consisté à développer des surfaces superomniphobes (connues pour leur propriété d’auto-nettoyage) via un dépôt chimique de nanostructures d’oxyde de zinc (ZnO). Nous avons montré que certaines nanostructures de forme réentrante présentent des angles de contact supérieurs à 140°, des hystérésis inférieures à 20° pour des liquides de tensions de surface supérieures à 35mN/m. Pour finir, ces deux approches ont été validées pour l’application envisagée. L’interaction entre biomolécules et biodétecteur SPR a pu être validée (i) en contrôlant la désorption des protéines du GO par une solution basique, (ii) en réalisant des ouvertures dans les nanostructures de ZnO
This work reports on the study of original strategies to limit biofouling in Electrowetting-on-Dielectric (EWOD) based microfluidic devices coupled with a Surface Plasmon Resonance (SPR) biosensor. Two complementary approaches have been investigated. In the first part, we take advantage of the high adsorption capacity of graphene oxide (GO) for biomolecules: the wetting properties of a mixed solution containing Bovin Serum Albumine (BSA) and GO show that GO keeps proteins in suspension inhibiting their adsorption on the surface. The most important result concerns the EWOD motion of BSA droplet with a concentration of 195ng/µL (with 500ng/µL of GO). In this case, the BSA concentration is 30 times higher than the BSA concentration which can be displaced without GO. We show also that the presence of GO in the droplet does not alter the enzymatic activity of horseradish peroxidase (HRP) after GO/HRP displacement. The other developed solution consists in the development of superomniphobic surfaces (known for their self-cleaning properties) via chemical deposition of zinc oxide (ZnO) nanostructures. The chemically functionalized ZnO nanostructures display contact angles higher than 140° and hysteresis lower than 20° for liquids of surface tensions higher than 35 mN/m. To conclude, these two approaches have been validated for the targeted application. Interaction between biomolecules and the SPR biosensor can be realized (i) by controlling proteins’ desorption from GO in base solution, (ii) by making microapertures in ZnO nanostructured surfaces

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Mickel, Walter. "Geometry controlled phase behavior in nanowetting and jamming". Phd thesis, Université Claude Bernard - Lyon I, 2011. http://tel.archives-ouvertes.fr/tel-00868861.

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This thesis is devoted to several aspects of geometry and morphology in wetting problems and hard sphere packings. First, we propose a new method to simulate wetting and slip on nanostructured substrates: a phase field model associated with a dynamical density theory approach. We showed omniphobicity, meaning repellency, no matter the chemical properties of the liquid on monovalued surfaces, i.e. surfaces without overhangs, which is in contradiction with the macroscopic Cassie-Baxter-Wenzel theory, can produce so-called We checked systematically the impact of the surface parameters on omniphobic repellency, and we show that the key ingredient are line tensions, which emerge from needle shaped surface structures. Geometrical effects have also an important influence on glassy or jammed systems, for example amorphous hard sphere systems in infinite pressure limit. Such hard sphere packings got stuck in a so-called jammed phase, and we shall demonstrate that the local structure in such systems is universal, i.e. independent of the protocol of the generation. For this, robust order parameters - so-called Minkowski tensors - are developed, which overcome robustness deficiencies of widely used order parameters. This leads to a unifying picture of local order parameters, based on geometrical principles. Furthermore, we find with the Minkowski tensor analysis crystallization in jammed sphere packs at the random closed packing point

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Lumba, Joseph Pascual. "Development and Study of Nanostructured Omniphobic Surfaces". Master's thesis, 2021. https://hdl.handle.net/10216/139578.

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Nurmukhamedova, Elvira. "Development and Study of Nanostructured Omniphobic Surfaces". Master's thesis, 2021. https://hdl.handle.net/10216/139596.

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Hensel, René. "Robust omniphobic surfaces by mimicking the springtail skin morphology". Doctoral thesis, 2013. https://tud.qucosa.de/id/qucosa%3A28206.

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Libri sul tema "Omniphobie"

Dillard, R. H. W. Omniphobia: Stories. Baton Rouge: Louisiana State University Press, 1995.

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Capitoli di libri sul tema "Omniphobie"

Zhu, Pingan, e Liqiu Wang. "Robust Omniphobic Surfaces by Microfluidic Emulsion Templating". In Microfluidics-Enabled Soft Manufacture, 217–40. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-96462-7_12.

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Ni, Tianlong, Shuaifei Zhao, Lingxue Kong e Jiuyang Lin. "Chapter 8. Omniphobic Membranes: Fundamentals, Materials, and Applications". In Advances in Functional Separation Membranes, 184–206. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839165436-00184.

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Lu, Kang-Jia, Yuanmiaoliang Chen e Tai-Shung Chung. "Design of Omniphobic Interfaces for Membrane Distillation". In Membrane Distillation, 183–208. CRC Press, 2019. http://dx.doi.org/10.1201/9780429287879-8.

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Atti di convegni sul tema "Omniphobie"

Mu, Hairong, Hui Zheng e Chunyang Wang. "FLUOROALKYL-MODIFIED POLYSILAZANES FOR OMNIPHOBIC COATINGS". In 37th International Academic Conference, Budapest. International Institute of Social and Economic Sciences, 2018. http://dx.doi.org/10.20472/iac.2018.037.011.

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Wilke, K. L., M. Garcia, D. J. Preston e E. N. Wang. "A SIMPLE FABRICATION METHOD FOR DOUBLY REENTRANT OMNIPHOBIC SURFACES VIA STRESS INDUCED BENDING". In 2018 Solid-State, Actuators, and Microsystems Workshop. San Diego: Transducer Research Foundation, 2018. http://dx.doi.org/10.31438/trf.hh2018.74.

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Sayed, Mohammed, Rajesh Saini e Hooisweng Ow. "Nano-Texturing of Hydrocarbon Reservoirs with Omniphobic Nanoparticles to Mitigate Liquid Phase Trapping". In SPE International Conference on Oilfield Chemistry. SPE, 2021. http://dx.doi.org/10.2118/204289-ms.

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Abstract Gas reservoirs contain substantial amounts of natural gas and, in some cases, associated high API liquid hydrocarbons. Condensation of heavy hydrocarbons, especially in the area closer to the wellbore, occurs as a direct result of the decline in reservoir pressure. This hydrocarbon condensate, and in some cases water, tends to accumulate in the pore space and form a liquid bank. This liquid bank will result in a reduction in gas relative permeability and overall reduction in the well's productivity. This paper illustrates the synthesis and utilization of surface modified silica nanoparticles to mitigate the liquid banking phenomenon in gas reservoirs. Silica nanoparticles (S-NPs), of different sizes, were synthesized using the Stöber process. The impact of the nanoparticle size and degree of functionalization with different hydrophobic and omniphobic groups on altering the rock wettability properties to mitigate liquid banking in gas reservoirs were studied. The S-NPs (of sizes between 50-400 nm) were functionalized with various linear and branched fluoroalkyl groups, terminal amine, and epoxy groups. The particle size of surface modified silica nanoparticles was determined using dynamic light scattering (DLS). The performance of the surface modified silica nanoparticles was evaluated through measuring surface charge, change in contact angle, and by performing core flow experiments at reservoir conditions. A glass slide dip coated with 135 nm surface modified silica nanoparticles solution derivatized with terminal amine and perfluoroalkyl group provided a contact angle of 120° and 83° with water and decane, respectively. The contact angle can be tailored by changing the amount of amine and perfluoroalkyl concentrations on the particle surfaces. A contact angle of around 90° indicates a nonwetting neutral surface that results in minimizing capillary pressure and enhancing mobility of both hydrocarbon and water liquid phases. Using core flow studies and by estimating the improvement in gas and liquid relative permeabilities, surface modified silica nanoparticles treatment demonstrated a comparable performance to commercially available solutions at 1/5 the treatment volume. The surface modified silica nanoparticles sustained its performance indicating a stable and permanent coating on the rock surface. The silica nanoparticles functionalized with fluoroalkyl group, terminal amine and epoxy can be directly pumped without the need for a pretreatment of the rock surface. This results in less complexity when it comes to the field operation. The dual- functionalized silica nanoparticles were found to be effective in changing the rock surface wettability to neutral or nonwetting, thereby providing a potential solution to liquid banking problem in gas reservoirs.

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Brown, Erika, Marshall Pickarts, Jose Delgado-Linares, Hao Qin, Carolyn Koh, Sumil Thapa, Nakatsuka Matthew e Vinod Veedu. "Scale-Up and Modeling Efforts Using an Omniphobic Surface Treatment for Mitigating Solids Deposition". In Offshore Technology Conference. OTC, 2022. http://dx.doi.org/10.4043/32059-ms.

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Abstract Gas hydrates, waxes and asphaltenes represent some of the most significant flow assurance challenges, especially in subsea lines, where treatment options can be limited. Currently, complete avoidance is the primary strategy for hydrate management, while chemical or mechanical flushing/pigging may be utilized for other solids. Each system must also be treated with individualized solutions, as there have been no proved one-size-fits-all technologies demonstrated to date. As an alternative to constant chemical injection or thermodynamic controls such as insulation or heating, a robust omniphobic surface treatment material has been developed which has been shown in previous studies to significantly reduce the adhesion of flow assurance solids, resulting in lower risk for deposition and plugging of gas hydrates, waxes, and asphaltenes. As part of a Department of Energy study, laboratory scale tests were performed on a variety of apparatuses ranging from micromechanical force (micron scale) to laboratory flow loop testing (meter scale). While the results from these tests have been promising, there can be some disconnects between lab-scale observations and field-scale testing. Several factors can result in discrepancies between small-scale bench-top studies and deployment-scale efforts. These include flow conditions (Reynolds number, flow regime), chemistry (synthetic vs. crude oils, gas composition, and additives), physical differences (pipeline material, size, and geometry), etc. This work will describe the actions taken to better understand the deployment and performance of a material such as this omniphobic surface treatment in field scenarios, and to build confidence for deployment in a production scenario. These efforts include modeling field production scenarios using models developed from lab observations, application of the material to field-scale equipment to better understand application challenges, and expanded survivability and longevity testing. Understanding the bridge between laboratory testing and full-scale deployment allows for better technique and risk mitigation for field scale testing.

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Gassway, G., e D. Miles. "Prediction of pore fluids and lithologies from P- and S-wave interval velocities as measured by OMNIPHONE: case history from Alberta, Canada". In EAGE/SEG Research Workshop 1990. European Association of Geoscientists & Engineers, 1990. http://dx.doi.org/10.3997/2214-4609.201411913.

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Nakatsuka, Matthew, Basile Marco, Sumil Thapa, Alexander Ventura, Osvaldo Pascolini, Luca Pellicciotta e Vinod Veedu. "Decarbonization and Improved Energy Efficiency Using a Novel Nanocomposite Surface Treatment". In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208080-ms.

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Abstract Fouling of heat exchanger equipment through the formation and attachment of hard scale, microbially induced corrosion (MIC) products, or particulate erosion is a serious challenge to reliable production in the oil and gas industry. Exchangers which become fouled in this way perform 15-30% worse than their rated ability, requiring either constant intervention to clean away biofilms, continuous injection of biocides and corrosion inhibitors, or the regular plugging of tubes to prevent leaks, representing a significant operating expense and billions of dollars in lost production time. When an exchanger is unable to provide sufficient heat due to tube fouling, additional sources of heating must be utilized to make up for this deficit and to ensure that facility processes remain within design allowances. This need for supplemental heating is a significant source of carbon emissions in the industry and represents a significant obstacle towards decarbonization efforts. However, it also represents an economically attractive way to simultaneously lower emissions while also lowering a producer's cost per barrel. This work describes an alternate strategy to control and prevent fouling in heat exchangers, through the one-time application of an omniphobic (water- and oil-repelling) nano-surface treatment. Once applied to a heat exchanger, the extremely smooth and low-surface energy material greatly reduces the ability of MIC-causing bacteria to deposit and adhere to the surface. Because it imparts functionality to the surface itself, rather than simply function as a physical barrier, it enables long lasting protection which was validated under laboratory conditions in a pressurized autoclave, as well as two pilot demonstrations. Results from both the laboratory and field evaluations of the treatment's promise showed that treated surfaces showed a corrosion rate over 36-times lower when compared to untreated surfaces, while also completely arresting the formation of corrosion pitting, tube fouling, and erosion of the tube interior. These field-validated results were then applied to the observed heating deficit of a proposed deployment site, resulting in calculated carbon emissions savings of up to 17,000 Tons CO2 per year.

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Pickarts, Marshall A., Jose Delgado-Linares, Erika Brown, Vinod Veedu e Carolyn A. Koh. "Surface Treatment Strategies for Mitigating Gas Hydrate & Asphaltene Formation, Growth, and Deposition in Flowloops". In Offshore Technology Conference. OTC, 2021. http://dx.doi.org/10.4043/31189-ms.

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Abstract (sommario):

Abstract Numerous solids including gas hydrates, waxes, and asphaltenes have the potential to form in the production lines of gas and oil fields. This creates a highly non-ideal scenario as the accumulation of said species leads to flow assurance issues, especially with long-term processes like deposition. Since an ever-increasing amount of material is deposited in place at the pipe surface, production stoppage or active mitigation efforts become inevitable. The latter production issues result in increased safety risks and operational expenditures. Therefore, a cost-effective, passive deposition mitigation technology, such as a pipeline coating or surface treatment is especially appealing. The ability to address multiple pipeline flow assurance issues simultaneously without actively disrupting production would represent a dramatic step forward in this area. This study is part of a long-term ongoing effort that evaluates the performance and application of an omniphobic surface treatment for solids deposition prevention in industrially relevant systems. In particular, this specific work concentrates on the efficacy and robustness of the treatment under fully flowing conditions. The apparatuses utilized for this include two flowloops: a lab-scale, high-pressure flowloop for gas hydrate and surface treatment durability studies, and a bench-scale, atmospheric pressure loop for crude oil and asphaltene experiments. Film growth in high-pressure flowloop tests corroborated previous reports of delayed gas hydrate nucleation observed in rocking cells. Without the aid of the memory effect, treated oil-dominated experiments never experienced hydrate formation, spending upwards of a week in the hydrate stability zone (at the subcooled/fluid test conditions). Subsequent tests which utilized the memory effect then revealed that the hydrate formation rate reduced in the presence of the surface treatment compared to a bare stainless-steel surface. This testing was part of a larger set of trials conducted in the flowloop, which lasted about one year. The surface treatment durability under flowing conditions was evaluated during this time. Even after experiencing ∼4000 operating hours and 2 full pressure cycles, no evidence of delamination or damage was detected. Finally, as part of an extension to previous work, corroded surface asphaltene deposition experiments were performed in a bench-top flowloop. Treated experiments displayed an order of magnitude reduction in both total oil (all fractions of crude oil) and asphaltene fraction deposited.

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