Bibliografie tematiche / Surface tension

Letteratura scientifica selezionata sul tema "Surface tension"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 28 luglio 2024

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Articoli di riviste sul tema "Surface tension"

1

Yang, Jinlong, Joseph M Michaud, Steven Jansen, H. Jochen Schenk e Yi Y. Zuo. "Dynamic surface tension of xylem sap lipids". Tree Physiology 40, n. 4 (6 febbraio 2020): 433–44. http://dx.doi.org/10.1093/treephys/tpaa006.

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Abstract The surface tension of xylem sap has been traditionally assumed to be close to that of the pure water because decreasing surface tension is thought to increase vulnerability to air seeding and embolism. However, xylem sap contains insoluble lipid-based surfactants, which also coat vessel and pit membrane surfaces, where gas bubbles can enter xylem under negative pressure in the process known as air seeding. Because of the insolubility of amphiphilic lipids, the surface tension influencing air seeding in pit pores is not the equilibrium surface tension of extracted bulk sap but the local surface tension at gas–liquid interfaces, which depends dynamically on the local concentration of lipids per surface area. To estimate the dynamic surface tension in lipid layers that line surfaces in the xylem apoplast, we studied the time-dependent and surface area-regulated surface tensions of apoplastic lipids extracted from xylem sap of four woody angiosperm plants using constrained drop surfactometry. Xylem lipids were found to demonstrate potent surface activity, with surface tensions reaching an equilibrium at ~25 mN m-1 and varying between a minimum of 19 mN m-1 and a maximum of 68 mN m-1 when changing the surface area between 50 and 160% around the equilibrium surface area. It is concluded that xylem lipid films in natural conditions most likely range from nonequilibrium metastable conditions of a supersaturated compression state to an undersaturated expansion state, depending on the local surface areas of gas–liquid interfaces. Together with findings that maximum pore constrictions in angiosperm pit membranes are much smaller than previously assumed, low dynamic surface tension in xylem turns out to be entirely compatible with the cohesion–tension and air-seeding theories, as well as with the existence of lipid-coated nanobubbles in xylem sap, and with the range of vulnerabilities to embolism observed in plants.
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Patterson, Ada M. "Surface Tension". Caribbean Quarterly 68, n. 3 (3 luglio 2022): 319–24. http://dx.doi.org/10.1080/00086495.2022.2105011.

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Mirsky, Steve. "Surface Tension". Scientific American 305, n. 4 (20 settembre 2011): 92. http://dx.doi.org/10.1038/scientificamerican1011-92.

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X-Gal. "Surface tension". Journal of Cell Science 122, n. 14 (1 luglio 2009): 2323–24. http://dx.doi.org/10.1242/jcs.055871.

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Edge, R. D. "Surface tension". Physics Teacher 26, n. 9 (dicembre 1988): 586–87. http://dx.doi.org/10.1119/1.2342636.

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Sajdera, Norbert. "Surface tension". Metal Finishing 98, n. 1 (gennaio 2000): 609–10. http://dx.doi.org/10.1016/s0026-0576(00)80368-2.

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Sajdera, Norbert. "Surface tension". Metal Finishing 97, n. 1 (gennaio 1999): 609–10. http://dx.doi.org/10.1016/s0026-0576(00)83119-0.

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Sajdera, Norbert. "Surface tension". Metal Finishing 105, n. 10 (2007): 528–30. http://dx.doi.org/10.1016/s0026-0576(07)80370-9.

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Sajdera, Norbert. "Surface tension". Metal Finishing 99 (gennaio 2001): 604–5. http://dx.doi.org/10.1016/s0026-0576(01)85319-8.

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Sajdera, Norbert. "Surface tension". Metal Finishing 100 (gennaio 2002): 599–600. http://dx.doi.org/10.1016/s0026-0576(02)82062-1.

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Tesi sul tema "Surface tension"

1

Laverty, Rory. "Surface tension /". Electronic version (PDF), 2007. http://dl.uncw.edu/etd/2007-1/r1/lavertyr/rorylaverty.pdf.

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Thompson, Alice B. "Surface-tension-driven coalescence". Thesis, University of Nottingham, 2012. http://eprints.nottingham.ac.uk/12522/.

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When fluid droplets coalesce, the flow is initially controlled by a balance between surface tension and viscosity. For low viscosity fluids such as water, the viscous lengthscale is quickly reached, yielding a new balance between surface tension and inertia. Numerical and asymptotic calculations have shown that there is no simply connected solution for the coalescence of inviscid fluid drops surrounded by a void, as large amplitude capillary waves cause the free surface to pinch off. We analyse in detail a linearised version of this free boundary problem. For zero density surrounding fluid, we find asymptotic solutions to the leading order linear problem for small and large contact point displacement. In both cases, this requires the solution of a mixed type boundary value problem via complex variable methods. For the large displacement solution, we match this to a WKB analysis for capillary waves away from the contact point. The composite solution shows that the interface position becomes self intersecting for sufficiently large contact point displacement. We identify a distinguished density ratio for which flows in the coalescing drops and surrounding fluid are equally important in determining the interface shape. We find a large displacement solution to the leading order two-fluid problem with a multiple-scales analysis, using a spectral method to solve the leading order periodic oscillator problem for capillary waves. This is matched to a single-parameter inner problem, which we solve numerically to obtain the correct boundary conditions for the secularity equations. We find that the composite solution for the two-fluid problem is simply connected for arbitrarily large contact-point displacement, and so zero density surrounding fluid is a singular limit.
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Fröba, Andreas P., Cristina Botero, Heiko Kremer e Alfred Leipertz. "Liquid viscosity and surface tension by surface light scattering". Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-196257.

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Fröba, Andreas P., Cristina Botero, Heiko Kremer e Alfred Leipertz. "Liquid viscosity and surface tension by surface light scattering". Diffusion fundamentals 2 (2005) 69, S. 1-2, 2005. https://ul.qucosa.de/id/qucosa%3A14402.

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Matthews, Thomas Robert. "Surface Properties of Poly(ethylene terephthalate)". University of Toledo / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1177515548.

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Clewett, James. "Emergent surface tension in boiling granular media". Thesis, University of Nottingham, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.604898.

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In this thesis we present findings from an experimental and numerical study of loosely confined, dry granular gases subject to vertical vibration. We found that the system phase separates into a high-density, liquid-like phase and a low-density gas-like phase. The phase separation was shown to occur at a critical driving amplitude but is independent of frequency. To introduce our work, we give an overview of phase separation in driven granular gases. Ofpatiicular interest are: a solid-liquid-like phase separation in tightly confined, dry granular mono layers and a liquid-gas-like phase separation in loosely confined, wet granular gases. Our system differs from the above examples in two significant ways: our cell is deeper than that used to tightly confine the granular mono layers, so that we avoid the formation of a solid-like phase; our patiicles are dry and as such there are no cohesive forces between the particles. The liquid-gas phase separation is a useful system in which to study far-from-equilibrium phenomena because the particles are easily homogenised and then quenched into the phase-separating state. The system also allows us to smoothly approach the phase-transition boundaries. The phase separation was shown to be spinodal driven, with a region of negative compressibility due to an excess in the granular temperature of the particles in the dilute phase. The origin of the excess temperature was traced to the coherent motion of particles above a critical driving amplitude. By switching to a frequency modulated driving signal the phase separation was suppressed, demonstrating the requirement for coherent motion. The experiment shows the importance of using realistic driving motion in simulations. The phase-separation coarsening dynamics were shown to be similar to that of thermodynamic systems evolving under curvature driven diffusion (model B). Using the Cahn-Hilliard equation we accurately predict the dominant length scale in the early-time dynamics. In thelIDodynamics the Cahn-Hilliard equation desclibes the minimisation of an excess interfacial energy. This suggests that we might define an effective free energy for our granular system, however, as yet it is not clear what is meant by free energy in the context of a far-fi·om-equilibrium system. Finally, by studying the surface tension of quasi-2D liquid-like droplets in the steady state, we found behaviour consistent with Laplace's equation, demonstrating that the surface tension is real. Detailed measurements of the pressure in the interfacial region show that the surface tension results predominantly from an unexpected anisotropy in the kinetic energy part of the pressure tensor, in contrast to thelIDodynamic systems where surface tension arises from either the attractive interaction between pmticles or entropit considerations. The general nature of our argument for the Oligin of the surface tension means that it should apply to other granular phase separations and segregations in granular rnixhlres. As such this might be a new general mechanism in far-from-equiliblium thermodynamics. Throughout the thesis we use numerical simulations, configured with a geometry matching that of the experimental cell. To simulate the two million particles required we created a bespoke molecular dynamics code to execute using GPGPU hardware. The peliormance of our simulations was comparable to the state of the art in the literature, approximately twenty times faster than simulations on modern CPU processors.
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Green, James Alexander. "Mixing in surface tension driven microchannel flows". Thesis, University of Hertfordshire, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.440160.

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Cho, Han-Jae Jeremy. "Surface tension and electroporation of lipid bilayers". Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67612.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 78-79).
Electroporation of lipid bilayers is widely used in DNA transfection, gene therapy, and targeted drug delivery and has potential applications in water desalination and filtration. A better, more thorough molecular understanding is needed, however, before such devices can be effectively used and developed. From aqueous pore formation theory, electroporation behavior is known to be largely dictated by surface energy. We hypothesize that this surface energy can be described by separate head and tail components of the lipid molecules, which can be obtained experimentally. In this thesis, we demonstrated a basic ability to electroporate lipid bilayers as well as verify its electrical behavior. We formed lipid monolayer and bilayer films and studied their wetting properties using water, formamide, and diiodomethane. We determined that the strong interaction between polar liquids (water and formamide) and hydrophilic substrates (mica and glass) can affect the wetting behavior and quality of films. In addition, we verified that the resulting surface energy of lipid tails is mostly nonpolar. The insights of this work offer a first step towards characterizing the surface energies of different lipids and how they relate to the electroporation behavior.
by Han-Jae Jeremy Cho.
S.M.
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Zhao, Yajing S. M. Massachusetts Institute of Technology. "Dropwise condensation of water and low surface tension fluids on structured surfaces". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/118679.

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Abstract (sommario):
Thesis: S.M., Massachusetts Institute of Technology, Department of Mechanical Engineering, 2018.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 55-57).
Condensation is a ubiquitous process often observed in nature and our daily lives. The large amount of latent heat released during the condensation process has been harnessed in many industrial processes such as power generation, building heating and cooling, desalination, dew harvesting, thermal management, and refrigeration. Condensation has two modes: dropwise mode and filmwise mode. Although it has been known for decades that dropwise condensation outperforms filmwise condensation in heat transfer owing to the droplet shedding effects which can efficiently reduce thermal resistance, filmwise condensation still dominates industrial applications currently due to the high costs, low robustness and technical challenges of manufacturing dropwise coatings. During water condensation, dropwise mode can be readily promoted with thin hydrophobic coatings. Superhydrophobic surfaces made out of hydrophobic coatings on micro-or-nano-engineered surfaces have shown further heat transfer enhancement in dropwise condensation of water; however, the applications of these micro- or nanoscale structured surface designs have been restricted by the high manufacturing expenses and short range of subcooling limit. Recent studies have shown that the combination of millimeter sized geometric features and plain hydrophobic coatings can effectively manipulate droplet distribution of water condensate, which provides opportunities to locally facilitate dropwise condensation at relatively low manufacturing expenses as compared to those delicate micro- and nano-structured hydrophobic surfaces. Low surface tension fluids such as hydrocarbons pose a unique challenge to achieving dropwise condensation, because common hydrophobic coatings are not capable of repelling low surface tension fluids. Recent development in lubricant infused surfaces (LIS) offers promising solutions to achieving dropwise condensation of low surface tension fluids by replacing the solid-condensate interface in conventional hydrophobic coatings with a smooth lubricant-condensate interface. However, only a few experimental studies have applied LIS to promoting dropwise condensation of low surface tension fluids (y as low as 15 mN/m). In this work, we investigated dropwise condensation of both water (y ~ 72 mN/m) and a low surface tension fluid, namely butane (y - 13 mN/m) on structured surfaces. For water condensation, we studied the effects of millimeter sized geometric structures on dropwise condensation heat transfer under two different environments: pure vapor and an air-vapor mixture. Our experimental results show that, although convex structures enable faster droplet growth in an air-vapor mixture, the same structures impose the opposite effect during pure vapor condensation, hindering droplet growth. We developed a numerical model for each case to predict the heat flux distribution along the structured surface, and the model shows good agreement with experimental results. This work demonstrates that the effects of geometric features on dropwise condensation are not invariable but rather dependent on the scenario of resistances to heat and mass transfer in the system. For butane condensation, based on a design guideline we recently developed for lubricant infused surfaces, we successfully designed an energy-favorable combination of lubricant and structured solid substrate, which was further demonstrated to promote dropwise condensation of butane. The fundamental understanding of dropwise condensation of water and low surface tension fluids on structured surfaces developed in this study provides useful guidelines for condensation applications including power generation, desalination, dew harvesting, and thermal management.
by Yajing Zhao.
S.M.
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Saksono, Prihambodo Hendro. "On finite element modelling of surface tension phenomena". Thesis, Swansea University, 2002. https://cronfa.swan.ac.uk/Record/cronfa42392.

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The objective of this work is to develop a computational framework for modelling the motion of liquid phase between moving particles associated with the processing of complex multiphase materials. The liquid phase may be present at various levels of saturation and necessarily includes numerous and irregular free surfaces. In this kind of situation the surface tension is dominant and governs the interparticle motion that plays a fundamental role during material processing. This work focuses on surface tension modelling using the finite element method. Two issues related to the modelling of surface tension are addressed in this thesis, the first one is the development of a finite element procedure capable of modelling accurately the motion of the free surface boundaries between the gas and liquid phases. The second issue is finite element modelling of surface tension at such boundaries. The finite element formulation is based on the use of the incremental flow formulation of the Lagrangian form of the initial boundary value problem governing the free surface flow. The incompressibility constraint associated with the Newtonian fluid employed in this work is imposed using the penalty method. With regard to the surface tension model, the constitutive model commonly known as the Laplace-Young equation is employed. In the Lagrangian framework the surface tension formulation emerges naturally through the weak form of the Laplace-Young equation and the use of the surface divergence theorem reduces the continuity requirement across the element boundary from to C[1] to C[0]. The performance of the finite element model of surface tension is validated by means of numerical examples for both equilibrium and dynamic cases. The finite element results are compared against both analytical solutions and experimental results.
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Libri sul tema "Surface tension"

1

Phillips, Steve. Surface tension. Lewiston, NY: Mellon Poetry Press, 1996.

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Saul, Anne-Marie. Surface tension. Dublin: University College Dublin, 2002.

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Kling, Christine. Surface tension. Waterville, Me: Thorndike Press, 2003.

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4

Mullin, Mike. Surface tension. Indianapolis, IN: Tanglewood Press, 2018.

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Clark-Langager, Sarah A. Surface tension. [Bellingham, Wash: Western Gallery, Western Washington University, 2003.

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Westbury, Deb. Surface tension. Wollongong [N.S.W.]: Five Islands Press, 1998.

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Franchesi, Marisa De. Surface tension. Toronto: Guernica, 1994.

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Rowe, Elisabeth. Surface tension. Calstock: Peterloo Poets, 2003.

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Franceshi, Marise De. Surface tension. Montréal, Qué: Guernica, 1994.

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Franceschi, Marisa De. Surface tension. Toronto: Guernica, 1994.

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Capitoli di libri sul tema "Surface tension"

1

Gooch, Jan W. "Surface Tension". In Encyclopedic Dictionary of Polymers, 717–18. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11445.

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Gooch, Jan W. "Surface Tension". In Encyclopedic Dictionary of Polymers, 718. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11446.

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Tadros, Tharwat. "Surface Tension". In Encyclopedia of Colloid and Interface Science, 1052. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-20665-8_152.

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Bahr, Benjamin, Boris Lemmer e Rina Piccolo. "Surface Tension". In Quirky Quarks, 34–37. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-49509-4_9.

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Williams, Paul Melvyn. "Surface Tension". In Encyclopedia of Membranes, 1871. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_1005.

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Oprea, John. "Surface tension". In The Mathematics of Soap Films: Explorations with Maple®, 1–30. Providence, Rhode Island: American Mathematical Society, 2000. http://dx.doi.org/10.1090/stml/010/01.

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Williams, Paul Melvyn. "Surface Tension". In Encyclopedia of Membranes, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-40872-4_1005-1.

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Gooch, Jan W. "Surface Tension". In Encyclopedic Dictionary of Polymers, 926. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_14901.

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Nappi, Carla. "Surface tension". In Early Modern Things, 29–50. 2a ed. 2nd edition. | New York: Routledge, 2021. | Series: Early modern themes: Routledge, 2021. http://dx.doi.org/10.4324/9781351055741-3.

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Qasem, Naef A. A., Muhammad M. Generous, Bilal A. Qureshi e Syed M. Zubair. "Surface Tension". In Springer Water, 265–79. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-35193-8_13.

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Atti di convegni sul tema "Surface tension"

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Plant, Nicola, e Patrick G. T. Healey. "Surface tension". In CHI '13 Extended Abstracts on Human Factors in Computing Systems. New York, New York, USA: ACM Press, 2013. http://dx.doi.org/10.1145/2468356.2479589.

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Lamorgese, A., e R. Mauri. "Nonequilibrium surface tension". In THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937312.

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Neumann, Burkhard, Horst Engel e Bernd Schleifenbaum. "Surface Tension Microscopy". In 33rd Annual Techincal Symposium, a cura di John E. Wampler. SPIE, 1989. http://dx.doi.org/10.1117/12.962712.

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Reivinen, M., e E. M. Salonen. "Surface tension problems with distributed torque". In CONTACT AND SURFACE 2013. Southampton, UK: WIT Press, 2013. http://dx.doi.org/10.2495/secm130071.

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Lee, Ki Bang, Firas Sammoura e Liwei Lin. "Surface Tension Propelled Microboats". In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60680.

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The operation of autonomous, liquid-fueled microboats driven by surface tension effects has been demonstrated, including the possibility of controlled steering. Two types of microboat with surface area of 6 × 11 mm2 have been fabricated by a bulk micromachining process and powered by 0.5μl of isopropanol on top of a pool of water. The first microboat design uses a cellulose film to store liquid-fuel and has been able to operate for 10 minutes with a maximum cruising velocity of 7.5cm/sec. The second microboat design uses a direct fueling system by adding a fuel droplet directly and has been able to cruise for about 30 seconds with a maximum velocity of 15cm/sec. A first-order theoretical model was developed that captures the discharging trend of the liquid-fuel and the surface tension effects. Numerical techniques were employed to find out the velocity profile of the microboat and compared with experimental results. Moreover, an onboard steerer has been added and successfully restrained the motion of the microboat into a desired path. When integrated with other microsystems, microboats could be used for future applications such as marine life observations or military surveillance/reconnaissance missions.
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Adamski, Przemyslaw, Agnieszka L. Gromiec, Mariusz Panak e Marek Wojciechowski. "Surface tension of MBBA". In Liquid and Solid State Crystals: Physics, Technology, and Applications, a cura di Jozef Zmija. SPIE, 1993. http://dx.doi.org/10.1117/12.156977.

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Pline, A., T. Jacobson, Y. Kamotani e S. Ostrach. "Surface Tension Driven Convection Experiment". In Space Programs and Technologies Conference and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1993. http://dx.doi.org/10.2514/6.1993-4312.

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Nasr-El-Din, H. A., M. B. Al-Otaibi, A. M. Al-Aamri e N. Ginest. "Surface Tension of Completion Brines". In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2005. http://dx.doi.org/10.2118/93421-ms.

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Hochstein, J., e T. Williams. "An implicit surface tension model". In 34th Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1996. http://dx.doi.org/10.2514/6.1996-599.

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Kim, Chang-Jin. "Micromachines driven by surface tension". In 30th Fluid Dynamics Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 1999. http://dx.doi.org/10.2514/6.1999-3800.

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Rapporti di organizzazioni sul tema "Surface tension"

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Turchi, Patrice A. Viscosity and Surface Tension of Metals. Office of Scientific and Technical Information (OSTI), aprile 2018. http://dx.doi.org/10.2172/1438687.

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2

Xu, Y., C. W. Angle e H. A. Hamza. Dynamic and equilibrium surface tension of aqueous polyacrylamide solutions. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1992. http://dx.doi.org/10.4095/305309.

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Weatherby, J. R., R. D. Krieg e C. M. Stone. Incorporation of surface tension into the structural finite element code SANCHO. Office of Scientific and Technical Information (OSTI), marzo 1989. http://dx.doi.org/10.2172/6185598.

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Fondeur, F., e T. Peters. DYNAMIC SURFACE TENSION AND DIFFUSIVITY MEASUREMENTS OF NG-CSSX NEXT GENERATION SOLVENT. Office of Scientific and Technical Information (OSTI), maggio 2014. http://dx.doi.org/10.2172/1135785.

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Morris, J. Technical Note: Description of Surface Tension as Implemented In LDEC-SPH Module. Office of Scientific and Technical Information (OSTI), febbraio 2009. http://dx.doi.org/10.2172/948975.

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Zhang, X., M. T. Harris e O. A. Basaran. A new method for measuring the dynamic surface tension of complex-mixture liquid drops. Office of Scientific and Technical Information (OSTI), giugno 1994. http://dx.doi.org/10.2172/110695.

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Norton, J. D., e L. R. Pederson. Ammonia in simulated Hanford double-shell tank wastes: Solubility and effects on surface tension. Office of Scientific and Technical Information (OSTI), settembre 1994. http://dx.doi.org/10.2172/10192447.

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Gauglitz, Phillip A., Lenna A. Mahoney, Jeremy Blanchard e Judith A. Bamberger. Surface Tension Estimates for Droplet Formation in Slurries with Low Concentrations of Hydrophobic Particles, Polymer Flocculants or Surface-Active Contaminants. Office of Scientific and Technical Information (OSTI), giugno 2011. http://dx.doi.org/10.2172/1024544.

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Wu, Qihau, Kathryn Kremer, Stephen Gibbons e Alan Kennedy. Determination of contact angle and surface tension of nanomaterial solutions by optical contact angle system. Engineer Research and Development Center (U.S.), luglio 2019. http://dx.doi.org/10.21079/11681/33395.

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Huber, Marcia L. Models for viscosity, thermal conductivity, and surface tension of selected pure fluids as implemented in REFPROP v10.0. Gaithersburg, MD: National Institute of Standards and Technology, agosto 2018. http://dx.doi.org/10.6028/nist.ir.8209.

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