Thematische Bibliographien / Hydrophobicity and hydrophilicity

Inhaltsverzeichnis

  1. Zeitschriftenartikel
  2. Dissertationen
  3. Buchteile
  4. Konferenzberichte

Auswahl der wissenschaftlichen Literatur zum Thema „Hydrophobicity and hydrophilicity“

Autor: Grafiati
Veröffentlicht am 28. Juni 2021
Zuletzt aktualisiert am 11. Februar 2022

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Zeitschriftenartikel zum Thema "Hydrophobicity and hydrophilicity"

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Reifsteck, F., S. Wee und B. J. Wilkinson. „Hydrophobicity--hydrophilicity of staphylococci“. Journal of Medical Microbiology 24, Nr. 1 (01.08.1987): 65–73. http://dx.doi.org/10.1099/00222615-24-1-65.

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van Oss, Carel Jan. „Hydrophobicity and hydrophilicity of biosurfaces“. Current Opinion in Colloid & Interface Science 2, Nr. 5 (Oktober 1997): 503–12. http://dx.doi.org/10.1016/s1359-0294(97)80099-4.

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Chmelík, Josef. „Characterization of the Hydrophobic Properties of Amino Acids. II. How Hydrophobic, Hydrophilic and Lipophilic Is Tryptophan?“ Collection of Czechoslovak Chemical Communications 58, Nr. 5 (1993): 996–1000. http://dx.doi.org/10.1135/cccc19930996.

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The model for the characterization of hydrophobicity, hydrophilicity and lipophilicity of compounds is presented. It is based on the vapour-to-solvent coefficients for hydrophilicity and lipophilicity and the partition coefficient for hydrophobicity. It is shown that some apparently contradictory facts can be understood on the basis of this model.
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van Oss, C. J. „The Hydrophilicity and Hydrophobicity of Clay Minerals“. Clays and Clay Minerals 43, Nr. 4 (1995): 474–77. http://dx.doi.org/10.1346/ccmn.1995.0430411.

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Zhu, Zhi, HongKai Guo, XianKai Jiang, YongCong Chen, Bo Song, YiMing Zhu und SongLin Zhuang. „Reversible Hydrophobicity–Hydrophilicity Transition Modulated by Surface Curvature“. Journal of Physical Chemistry Letters 9, Nr. 9 (19.04.2018): 2346–52. http://dx.doi.org/10.1021/acs.jpclett.8b00749.

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Ohto, Tatsuhiko, Johannes Hunger, Ellen H. G. Backus, Wataru Mizukami, Mischa Bonn und Yuki Nagata. „Trimethylamine-N-oxide: its hydration structure, surface activity, and biological function, viewed by vibrational spectroscopy and molecular dynamics simulations“. Physical Chemistry Chemical Physics 19, Nr. 10 (2017): 6909–20. http://dx.doi.org/10.1039/c6cp07284d.

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Rattanakam, Ramida, Pinitpon Pituya, Mantana Suwan und Sitthisuntorn Supothina. „Assessment of Hydrophilic Biochar Effect on Sandy Soil Water Retention“. Key Engineering Materials 751 (August 2017): 790–95. http://dx.doi.org/10.4028/www.scientific.net/kem.751.790.

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This paper reports studies to investigate the relationships between hydrophobicity of biochar surface and soil water retention. The studied biochars were produced from acacia wood, cashew wood and bamboo. The resulting materials were oxidized via liquid oxidation to generate hydrophilic biochars containing oxygenated functional groups on the surface. All biochars were characterized and their ability as soil additives to enhance water retention was assessed. Our results suggest that hydrophobicity/hydrophilicity of biochars is not the major factor governing water retention ability of this particular soil. However, hydrophilicity of biochar helps improve soil permeability by providing better wettability to the soil.
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Rossi, B., V. Venuti, F. D'Amico, A. Gessini, F. Castiglione, A. Mele, C. Punta et al. „Water and polymer dynamics in a model polysaccharide hydrogel: the role of hydrophobic/hydrophilic balance“. Physical Chemistry Chemical Physics 17, Nr. 2 (2015): 963–71. http://dx.doi.org/10.1039/c4cp04045g.

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Wang, Weipeng, Zheng Xie, Zhengcao Li und Zhengjun Zhang. „X-ray irradiation-induced reversible wettability modification of titanium NRAs“. RSC Advances 5, Nr. 6 (2015): 4524–28. http://dx.doi.org/10.1039/c4ra13093f.

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Fileti, Eudes, und Vitaly V. Chaban. „Solubility origin at the nanoscale: enthalpic and entropic contributions in polar and nonpolar environments“. Physical Chemistry Chemical Physics 19, Nr. 5 (2017): 3903–10. http://dx.doi.org/10.1039/c6cp07667j.

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Dissertationen zum Thema "Hydrophobicity and hydrophilicity"

1

Jeffcoat, Stuart Blakely. „The importance of hydrophobicity/hydrophilicity on particle removal in deep bed filtration and macroscopic filtration modeling“. Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/20149.

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KIM, BONGSU. „LONG-TERM STABILITY OF PLASMA OXIDIZED POLYDIMETHYLSILOXANE SURFACES“. University of Cincinnati / OhioLINK, 2004. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1100893247.

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Cai, Shaobiao. „3D numerical modeling of dry/wet contact mechanics for rough, multilayered elastic-plastic solid surfaces and effects of hydrophilicity/hydrophobicity during separation with applications“. Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1205118488.

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Černohorský, Petr. „Elektrospřádaná vlákna na bázi PVDF a nylonu“. Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442506.

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Polymer nanofibers used for the construction of triboelectric nanogenerator (TENG) and piezoelectric nanogenerator (PENG) are new and promising technologies for energy recovery. Thanks to the generation of electrical energy based on mechanical movement (deformation), these fibers can find application in the field of self-powered electronic devices. In this work, three nanofibrous structures of materials were prepared by electrostatic spinning: pure polyvinylidene fluoride (PVDF), pure polyamide-6 (PA6) and their mixed combination PVDF / PA6. Non-destructive analyzes such as Raman spectroscopy, FTIR, XPS and electron microscopy were used to study the properties of nanofibers. Analyzes confirmed the positive effect of electrostatic spinning of polymers on the support of the formation of highly polar crystalline -phase in PVDF and , -phase in PA6. The structure arrangement of the nanofibrous material and their defects were observed by scanning electron microscopy (SEM). Furthermore, the contact angle of the wettability of the liquid on the surface was measured for the materials, and the permittivity was measured to monitor the dielectric properties. The described results make the mixed material PVDF / PA6 very promising for further research in the field of nanogenerators and functional textiles.
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Asmatulu, Ramazan. „Advanced Chemical-Mechanical Dewatering of Fine Particles“. Diss., Virginia Tech, 2001. http://hdl.handle.net/10919/26604.

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In the present work, novel dewatering aids and a novel centrifuge configuration were developed and applied for the purpose of dewatering fine particles. Three different types dewatering reagents were tested in different filtration and centrifugation units. These chemicals included low-HLB surfactants, naturally occurring lipids, and modified lipids. Most of these reagents are insoluble in water; therefore, they were used in solutions of appropriate solvents, such as light hydrocarbon oils and short-chain alcohols. The role of these reagents was to increase the hydrophobicity of the coal and selected mineral particles (chalcopyrite, sphalerite, galena, talc, clay, phosphate, PCC and silica) for the dewatering. In the presence of these reagents, the water contact angles on the coal samples were increased up to 90o. According to the Laplace equation, an increase in contact angle with the surfactant addition should decrease the capillary pressure in a filter cake, which should in turn increase the rate of dewatering and help reduce the cake moisture. The use of the novel dewatering aids causes a decrease in the surface tension of water and an increase in the porosity of the cake, both of which also contribute to improved dewatering. A series of batch-scale dewatering tests were conducted on a variety of the coal and mineral samples using the novel dewatering aids. The results obtained with a Buchner funnel and air pressure filters showed that cake moistures could be reduced substantially, the extent of which depends on the particle size, cake thickness, drying time, reagent dosage, conditioning time, reagent type, sample aging, water chemistry, etc. It was determined that use of the novel dewatering aids could reduce the cake formation time by a significant degree due to the increased kinetics of dewatering. At the same time, the use of the dewatering aids reduced the cake moistures by allowing the water trapped in smaller capillaries of the filter cake. It was found that final cake moistures could be reduced by 50% of what can be normally achieved without using the reagents. However, the moisture reduction becomes difficult with increasing cake thickness. This problem can be minimized by applying a mechanical vibration to the cake, spraying a short-chain alcohol on the cake and by adding a small amount of an appropriate coagulant, such as alum and CaCl2 to the coal and mineral slurries. The novel dewatering aids were also tested using several different continuous filters, including a drum filter, disc filter and horizontal belt filter (HBF). The results obtained with these continuous filtration devices were consistent with those obtained from the batch filters. Depending on the coal and mineral samples and the type of the reagent, 40 to 60% reductions in moisture were readily achieved. When using vacuum disc filters, the cake thickness increased substantially in the presence of the novel dewatering aids, which could be attributed to the increased kinetics of dewatering. A dual vacuum system was developed in the present work in order to be able to control the cake thickness, which was necessary to achieve lower cake moistures. It was based on using a lower vacuum pressure during the cake formation time, while a full vacuum pressure was used during the drying cycle time. Thus, use of the dual vacuum system allowed the disc filter to be used in conjunction with the novel dewatering aids. Its performance was similar to that of HBF, which is designed to control cake thickness and cake formation time independently. The effectiveness of using the novel dewatering aids were also tested in a full-continuous pilot plant, in which coal samples were cleaned by a flotation column before the flotation product was subjected to the disc filter. The tests were conducted with and without using novel dewatering aids. These results were consistent with those obtained from the laboratory and batch-scale tests. The novel centrifuge developed in the present work was a unit, which combined a gravity force and air pressure. The new centrifuge was based on increasing the pressure drop across the filter cake formed on the surface of the medium (centrifuge wall). This provision made it possible to take advantage of Darcy s law and improve the removal of capillary water, which should help lower the cake moisture. A series of tests were conducted on several fine coal and mineral particles and obtained more than 50% moisture reduction even at very fine particle size (2 mm x 0). Based on the test results obtained in the present work, two proof-of-concept (POC) plants have been designed. The first was for the recovery of cyclone overflows that are currently being discarded in Virginia, and the other was for the recovery of fines from a pond in southern West Virginia. The former was designed based on the results of the plant tests conducted in the present work. Cost vs. benefit analyses were conducted on the two POC plants. The results showed very favorable internal rates of return when using the novel dewatering aids. Surface chemistry studies were conducted on the coal samples based on the results obtained in the present investigation. These consisted mainly of the surface characterization of the coal samples (surface mineral composition, surface area, zeta potential, x-ray photoelectron microscopy (XPS)), acid-base interactions of the solids and liquids, dewatering kinetic tests, contact angle measurements of the coal samples and surface force measurements using AFM. In addition, carbon coating on a silica plate using palsed laser deposition (PLD) and Langmuir-Blodgett (LB) film deposition tests were conducted on the sample to better understand the surfactant adsorption and dewatering processes. The test results showed that the moisture reductions on the fine particles agree well with the surface chemistry results.
Ph. D.
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Chen, Bing-Shian, und 陳秉賢. „Antireflection, Hydrophilicity and Hydrophobicity of Well-aligned Silicon Nanograss“. Thesis, 2007. http://ndltd.ncl.edu.tw/handle/4y8eqk.

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碩士
中華大學
電機工程學系(所)
95
Antireflective moth eye and superhydrophobic lotus leaves have inspired many synthetic surfaces to mimic nature, but it is hard to generate both properties on one surface. Reflection can be reduced by introducing a rough layer with graded refractive index between air and surface, and hydrophobic properties can be enhanced by a rough surface coupled with low energy. Recently we have demonstrated a process to fabricate well-aligned silicon nanograss with uniformly aspect ratio and distribution on silicon wafer by hydrogen plasma dry etching in a high density plasma chemical vapor deposition system. With this nanograss structure, the reflection of silicon wafer can be reduced apparently in the range of DUV to near-IR (200 ~ 900 nm). Due to silicon nanograss surface is superhydrophilic, we use CHF3 plasma to lower the surface energy. The reflectance measured by an n&k analyzer shows that after CHF3 plasma treatment the reflection of nanograss surface can be reduced. After exposure to CHF3 plasma, the surface changed to hydrophobic state with a greatest static angle of 145.49degrees. These results indicate this nanograss structure with antireflection, hydrophilicity and hydrophobicity.
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Huei, Jhuang Chao, und 莊朝輝. „Controlling hydrophilicity and hydrophobicity of the roller material for contact printing“. Thesis, 2013. http://ndltd.ncl.edu.tw/handle/68070816249713243737.

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碩士
國立中正大學
化學工程研究所
101
In this thesis, the PDMS (Poly(dimethylsiloxane)) is my reactant. The PDMS reacts with a crosslinking agent to synthesize the crosslinked PDMS. Then, crosslinked PDMS reacts with PEG (poly (ethylene glycol)) to synthesize the desired polymer. Because the PDMS and PEG have OH functional groups, the reaction can not achieve the effect of modified. I need to do PEG acidification and use crosslinked PDMS to react with acid-terminated PEG. The reaction is the Steglich esterification to synthesize the hydrophilic materials. Finally, I do some analysis to discuss the thermal properties, the hydrophilicity and its subsequent application of the polymer. The study uses quantitative PDMS, two different degree of crosslinking polymer, to react with different proportions acid-terminated PEG. The process is Steglich esterification reaction. By 1H-NMR and FTIR spectra can prove that the acid-terminated PEG synthesis is successful. By the XPS spectrum, the crosslinked PDMS reacts with acid-terminated PEG is successful. By TGA analysis, temperature (Td) of light and heavy crosslinking PDMS are 355.93 and 351.18 ° C. Modified polymers have higher Td, indicating good thermal stability. The glass transition temperature (Tg) of light and heavy crosslinking PDMS are -52 and -56 ° C. The modified polymers have a steady increase in Tg. In addition, in the graph and crystal melting temperature (Tm) was not observed by DSC chart to display the synthesized polymer not having a crystalline, and noncrystalline polymer. By contact angle analysis, the contact angle of modified polymers are decrease than crosslinking PDMS. It proves that the hydrophilic modification is successful.
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Yang, Shun Po, und 楊舜博. „Antireflection, Hydrophilicity and Hydrophobicity of Well-aligned Silicon Nanograss and Nanopillar“. Thesis, 2008. http://ndltd.ncl.edu.tw/handle/36353389352613183205.

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碩士
中華大學
電機工程學系(所)
96
A lot of living beings in nature have self-protection functions such as antireflective moth eyes and superhydrophobic lotus leaf, which inspires us to apply them to nanomaterial technologies. We can generate a graded rough layer between air and surface to reduce reflection, and coating low-energy materials on the rough layer to increase the hydrophobicity. In general, it is very difficult to create them on one material surface. We have developed a technology to create uniform nanograss on silicon wafer by HDPCVD hydrogen plasma etching process recently. The reflection can be reduced with the increase of nanograss length. In this thesis we fabricate nanopost array first by e-beam lithography, and then create nanograss on top of it. Examined by n&k analyzer shows a downward trends in the reflection. After treated with CHF3 plasma for few seconds, the surface transferred from superhydrophilic to robust superhydrophobic state, which shows that both antireflection and superhydrophobic can be obtained simultaneously by this approach.
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Li, Shan, und 李珊. „Wetting Behavior of Water Droplet on Patterned Surface and Quantitative Definition of Hydrophilicity and Hydrophobicity“. Thesis, 2017. http://ndltd.ncl.edu.tw/handle/rga2q4.

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碩士
國立臺灣大學
化學工程學研究所
105
Our study was focus on the quantitative definition of surface hydrophilicity and hydrophobicity. Four kinds of materials have been chosen, and the surfaces underwent surface modification to enhance their hydrophilicity. Among the surface with different wettability, advancing contact angle of the surfaces ranges from 90.8 degree to 31.6 degree, while receding contact angle of the surfaces ranges from 58.2 degree to 0 degree. Two parts included in our study: observation of wetting phenomena of water droplet deposited on flat and patterned surfaces, and contact angle measurements. Hydrophilicity and hydrophobicity are among the most important concepts in surface chemistry, and wettability phenomena has been studied for more than 200 years. Conventionally, 90 degree is considered as critical contact angle or, on the other word, quantitative definition of relative terms “hydrophilic” or “hydrophobic”. However, the critical contact angle still remain the subject of some debate in the literature. The most well-known definition is given by Vogler with which is 65 degree. In the experiment, we prepared surfaces with various wettability and modified their surface roughness by creating regular pillar-patterned structure. We observed the wetting phenomena of water droplet, and measured water advancing and receding contact angle. The data reveals that 65 degree given by Vogler does not fit the results, and there is no specific contact angle to precisely define whether the surface is either hydrophilic or hydrophobic. Upon examination of wetting transition and contact angle data between water and a variety of solid surfaces, an improved definition for hydrophilicity and hydrophobicity is proposed. A surface is hydrophobic when advancing contact angle is larger than 90 degree or receding contact angle larger than 55 degree, while a surface is hydrophilic when advancing contact angle lower than 35 degree. Beside, for surfaces with advancing contact angle ranges from 35 to 55 degree, it was difficult for us to find material that contact angle could be stably measured and with high reproducibility. Therefore, we tried to modify PDMS surface by poly (acrylic acid) photografting polymerization. Hoping that their wettability could be varied in a continuous manner by adjusting UV exposure duration. Though the goal hasn’t been achieved, some surface properties after graft polymerization were provided: (1) surface roughness (Ra) lies in 0-3.5 nm indicates that the surface after modification is almost flat and homogenous. Therefore, the dimension would not change macroscopically if we applied the reaction to pillar-patterned structure surfaces. (2) With increasing exposure duration, receding contact angle dropped to 0 degree first, followed by decrease of advancing contact angle. (3) Lower monomer concentration leads to limit modification with advancing contact angle 80 degree. Further UV exposure would not leads to higher hydrophilicity. Under high monomer concentration, advancing contact angle could drop from 100 degree to 20 degree within 10 min exposure. But the change of contact angle was not in a continuous manner within 6-9 min exposure duration. (4) Under the same reaction condition, larger spacing distance between glass and PDMS surface resulted in lower advancing contact angle.
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An-ChangYang und 楊安正. „The Study of the Composition of Self-Assembled Monolayer on the Hydrophobicity or Hydrophilicity in Nanoscale“. Thesis, 2011. http://ndltd.ncl.edu.tw/handle/69207262136257598527.

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Buchteile zum Thema "Hydrophobicity and hydrophilicity"

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Lag, J., Amos Hadas, Rhodes W. Fairbridge, J. C. Nóvoa Muñoz, X. Pontevedra Pombal, A. Martínez Cortizas, Gonzalo Almendros et al. „Hydrophilicity, Hydrophobicity“. In Encyclopedia of Soil Science, 329–30. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-3995-9_279.

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Kohno, Yuki, und Hiroyuki Ohno. „CHAPTER 4. Switchable Hydrophobicity and Hydrophilicity“. In Polymerized Ionic Liquids, 117–42. Cambridge: Royal Society of Chemistry, 2017. http://dx.doi.org/10.1039/9781788010535-00117.

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Westphal, Ulrich. „Hydrophobicity and Hydrophilicity of Steroid Binding Sites“. In Steroid-Protein Interactions II, 265–75. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-82486-9_8.

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Tofail, S. A. M., und A. A. Gandhi. „Chapter 1. Electrical Modifications of Biomaterials' Surfaces: Beyond Hydrophobicity and Hydrophilicity“. In Nanoscience & Nanotechnology Series, 3–14. Cambridge: Royal Society of Chemistry, 2011. http://dx.doi.org/10.1039/9781849733366-00003.

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Herbette, Leo G. „A structural model for drug interactions with biological membranes: Hydrophobicity, hydrophilicity and amphiphilicity in drug structures“. In Trends in QSAR and Molecular Modelling 92, 76–85. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1472-1_10.

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„Hydrophobicity and Hydrophilicity“. In Water at Interfaces, 155–87. CRC Press, 2014. http://dx.doi.org/10.1201/b16755-5.

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Tóth, Ajna, und Krisztina László. „Water Adsorption by Carbons. Hydrophobicity and Hydrophilicity“. In Novel Carbon Adsorbents, 147–71. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-08-097744-7.00005-3.

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Kelvii Kwok, Yeeli. „Wettability on Different Surfaces“. In 21st Century Surface Science - a Handbook. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.92885.

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Wettability has been explored for 100 years since it is described by Young’s equation in 1805. It is all known that hydrophilicity means contact angle (θ), θ < 90°; hydrophobicity means contact angle (θ), θ > 90°. The utilization of both hydrophilic surfaces and hydrophobic surfaces has also been achieved in both academic and practical perspectives. In order to understand the wettability of a droplet distributed on the textured surfaces, the relevant models are reviewed along with understanding the formation of contact angle and how it is affected by the roughness of the textured surface aiming to obtain the required surface without considering whether the original material is hydrophilic or hydrophobic.
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Konferenzberichte zum Thema "Hydrophobicity and hydrophilicity"

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Han, Yu, Peng Li, Liangyu Zhao, Wenxin Wang, Jinsong Leng und Peng Jin. „Facile hydrophobicity/hydrophilicity modification of SMP surface based on metal constrained cracking“. In SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, herausgegeben von Yoseph Bar-Cohen. SPIE, 2015. http://dx.doi.org/10.1117/12.2084494.

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Pakdel, Amir, Takao Mori, Yoshio Bando und Dmitri Golberg. „Interface engineering of bio-inspired Boron nitride nano-architectures toward controllable hydrophobicity/hydrophilicity“. In 2015 IEEE 10th International Conference on Nano/Micro Engineered and Molecular Systems (NEMS). IEEE, 2015. http://dx.doi.org/10.1109/nems.2015.7147380.

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Maghsoudy-Louyeh, S., H. S. Ju, B. R. Tittmann, Donald O. Thompson und Dale E. Chimenti. „SURFACE ROUGHNESS STUDY IN RELATION WITH HYDROPHILICITY∕HYDROPHOBICITY OF MATERIALS USING ATOMIC FORCE MICROSCOPY“. In REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION VOLUME 29. AIP, 2010. http://dx.doi.org/10.1063/1.3362244.

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Kanidi, M., A. Papagiannopoulos, A. Matei, M. Dinescu, S. Pispas und M. Kandyla. „Functional Surfaces of Laser-microstructured Silicon Coated with Polymer Blends Switching Between Hydrophilicity and Hydrophobicity“. In CLEO: Science and Innovations. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/cleo_si.2020.sth4h.4.

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Warsinger, David, Jaichander Swaminathan, Lucien L. Morales, Margaret Bertoni und John H. Lienhard V. „Visualization of droplet condensation in membrane distillation desalination with surface modification: hydrophilicity, hydrophobicity, and wicking spacers“. In Second Thermal and Fluids Engineering Conference. Connecticut: Begellhouse, 2017. http://dx.doi.org/10.1615/tfec2017.mst.017553.

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Madadi, Hojjat, und Jasmina Casals-Terré. „Study the Effects of Different Surfactants on Hydrophilicity of Polydimethylsiloxane (PDMS)“. In ASME 2012 11th Biennial Conference on Engineering Systems Design and Analysis. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/esda2012-82399.

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The outstanding characteristics of polydimethylsiloxane (PDMS) caused its extensive use as base material to manufacture microfluidic devices. PDMS has numerous advantages coming from instinct properties such as its low cost, simple fabrication procedure, and robust nature that make it a compatible material in many applications such as biological and biomedical engineering. In spite of favorable physical and chemical properties, hydrophobic surface of PDMS is sometimes debatable. Because of PDMS is highly hydrophobic, pumping aqueous solution through microchannels using only capillary forces might be difficult. Although many surface treatments methods have been proposed to modify and increase the hydrophilicity of PDMS [Oxygen plasma [1], UV-radiation [2], Silanization and Chemical vapour deposition [3],…], the use of surfactants is the most effective and easiest method to overcome the hydrophobicity compared to more complex protocols which require expensive facilities [4,5]. The hydrophilic behavior of surfactant-added PDMS and especially its biocompatibility has allowed many microfluidic bio-applications such as separation of biomolecules [6,7], blood cell separation [8] and cell-based assay [9,10]. This paper discusses about the efficiency of adding different surfactants on the wettability of PDMS.
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Yang, Hao, Qin Wang, Fuying Li, Yanhong Zhu, Lu Gan und Xiangliang Yang. „Abstract 3099: pH-regulated hydrophilicity/hydrophobicity-, surface charge-reversible and redox sensitive nanogels for anticancer drug delivery“. In Proceedings: AACR Annual Meeting 2017; April 1-5, 2017; Washington, DC. American Association for Cancer Research, 2017. http://dx.doi.org/10.1158/1538-7445.am2017-3099.

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Meng Li und Si Wu. „Research on hydrophilicity and hydrophobicity of adsorption of NOM on metal oxide/ water interface in different pH values“. In 2011 Second International Conference on Mechanic Automation and Control Engineering (MACE). IEEE, 2011. http://dx.doi.org/10.1109/mace.2011.5987485.

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Abdulhafez, Moataz, Angela J. McComb und Mostafa Bedewy. „Laser-Induced Nanocarbon Formation for Tuning Surface Properties of Commercial Polymers“. In ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8339.

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Abstract The growth of laser-induced nanocarbons, referred to here are LINC for short, directly on polymeric surfaces is a promising route toward surface engineering of commercial polymers. This paper aims to demonstrate how this new approach can enable achieving varied surface properties based on tuning the nanostructured morphology of the formed graphitic material on commercial polyimide (Kapton) films. We elucidate the effects of tuning laser processing parameters on the achieved nanoscale morphology and the resulting surface hydrophobicity or hydrophilicity. Our results show that by varying lasing power, rastering speed, laser spot size, and line-to-line gap sizes, a wide range of water contact angles are possible, i.e. from below 20° to above 110°. Combining water contact angle measurements from an optical tensiometer with LINC surface characterization using optical microscopy, electron microscopy, and Raman spectroscopy enables building the process-structure-property relationship. Our findings reveal that both the value of contact angle and the anisotropic wetting behavior of LINC on polyimide are dependent on their hierarchical surface nanostructure which ranges for isotropic nanoporous morphology to fibrous morphology. Results also show that increasing gap sizes lead to an increase in contact angles and thus an increase in the hydrophobicity of the surface. Hence, our work highlight the potential of this approach for manufacturing flexible devices with tailored surfaces.
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Noguchi, Hiroki. „Heat Transfer Enhancement Effect of Nanostructured Surface Made of Carbon Nanotube on SiC Ceramics“. In ASME 2013 11th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icnmm2013-73170.

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The Japan Atomic Energy Agency (JAEA) has been conducting research and development on the thermo-chemical iodine–sulfur (IS) process, which is one of the most attractive water-splitting hydrogen production methods using the nuclear heat of a high-temperature gas-cooled reactor (HTGR). In researching this IS process, a silicon carbide (SiC) heat exchanger with good corrosion resistance was used in a corrosive situation in boiling sulfuric acid. With the aim of enhancing heat transfer in the SiC heat exchanger, a nanostructured surface made of carbon nanotubes (CNTs) was produced on a SiC substrate by surface decomposition. Two types of SiC, one produced by pressureless sintering (PLS-SiC) and one by chemical vapor deposition (CVD-SiC), were used as substrates. CNTs formed by the surface decomposition of SiC can vary depending on the crystal structure of the substrates. Additionally, in order to investigate surface wettability, nanostructured surfaces on the CVD-SiC with hydrophilicity and hydrophobicity were produced. The effects of heat transfer enhancement by the nanostructured surfaces were evaluated by a convective heat transfer test using de-ionized water. The nanostructured surface on the CVD-SiC with hydrophilicity was the only surface that showed any heat transfer enhancement. However, this enhancement was much smaller than those previously reported. The experiment showed that the small size of the nanopores influenced the heat transfer enhancement and that the wettability of the nanostructured surface was related to heat transfer enhancement.
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