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Thematische Bibliographien / Hydrophobicity and hydrophilicity / Zeitschriftenartikel

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Zeitschriftenartikel zum Thema „Hydrophobicity and hydrophilicity“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 11. Februar 2022

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Angiolini, Lorenzo, Sabrina Valetti, Boiko Cohen, Adam Feiler und Abderrazzak Douhal. „Fluorescence imaging of antibiotic clofazimine encapsulated within mesoporous silica particle carriers: relevance to drug delivery and the effect on its release kinetics“. Physical Chemistry Chemical Physics 20, Nr. 17 (2018): 11899–911. http://dx.doi.org/10.1039/c7cp08328a.

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12

Rodríguez-Hermida, Sabina, Min Ying Tsang, Claudia Vignatti, Kyriakos C. Stylianou, Vincent Guillerm, Javier Pérez-Carvajal, Francesc Teixidor et al. „Switchable Surface Hydrophobicity-Hydrophilicity of a Metal-Organic Framework“. Angewandte Chemie 128, Nr. 52 (28.11.2016): 16283–87. http://dx.doi.org/10.1002/ange.201609295.

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13

Rodríguez-Hermida, Sabina, Min Ying Tsang, Claudia Vignatti, Kyriakos C. Stylianou, Vincent Guillerm, Javier Pérez-Carvajal, Francesc Teixidor et al. „Switchable Surface Hydrophobicity-Hydrophilicity of a Metal-Organic Framework“. Angewandte Chemie International Edition 55, Nr. 52 (28.11.2016): 16049–53. http://dx.doi.org/10.1002/anie.201609295.

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14

Saada, A., B. Siffert und E. Papirer. „Comparison of the Hydrophilicity/Hydrophobicity of Illites and Kaolinites“. Journal of Colloid and Interface Science 174, Nr. 1 (September 1995): 185–90. http://dx.doi.org/10.1006/jcis.1995.1381.

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15

Chen, Zhidi, Jeffrey Penfold, Peixun Li, James Doutch, Yaxun Fan und Yilin Wang. „Effects of length and hydrophilicity/hydrophobicity of diamines on self-assembly of diamine/SDS gemini-like surfactants“. Soft Matter 13, Nr. 47 (2017): 8980–89. http://dx.doi.org/10.1039/c7sm02058a.

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16

Yang, Zhen, Yanling Tian, Yuechao Zhao und Chengjuan Yang. „Study on the Fabrication of Super-Hydrophobic Surface on Inconel Alloy via Nanosecond Laser Ablation“. Materials 12, Nr. 2 (16.01.2019): 278. http://dx.doi.org/10.3390/ma12020278.

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Nanosecond laser ablated metallic surfaces showed initial super-hydrophilicity, and then experienced gradual wettability conversion to super-hydrophobicity with the increase of exposing time to ambient air. Due to the presence of hierarchical structures and change of surface chemistry, the laser-induced Inconel alloy surfaces showed a stable apparent contact angle beyond 150° over 30-day air exposure. The wetting states were proposed to elucidate the initial super-hydrophilicity and the final super-hydrophobicity. The basic fundaments behind the wettability conversion was explored by analyzing surface chemistry using X-ray photoelectron spectroscopy (XPS). The results indicated that the origins of super-hydrophobicity were identified as the increase of carbon content and the dominance of C–C(H) functional group. The C–C(H) bond with excellent nonpolarity derived from the chemisorbed airborne hydrocarbons, which resulted in dramatic reduction of surface-free-energy. This study confirmed that the surface chemistry is not the only factor to determine surface super-hydrophobicity. The laser-induced super-hydrophobicity was attributed to the synergistic effect of surface topography and surface chemical compositions. In this work, the corresponding chemical reaction was particularly described to discuss how the airborne hydrocarbons were attached onto the laser ablated surfaces, which reveals the generation mechanism of air-exposed super-hydrophobic surfaces.

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17

Law, Kock-Yee. „Water–surface interactions and definitions for hydrophilicity, hydrophobicity and superhydrophobicity“. Pure and Applied Chemistry 87, Nr. 8 (01.08.2015): 759–65. http://dx.doi.org/10.1515/pac-2014-1206.

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AbstractHydrophilicity and hydrophobicity are among the most important concepts in surface chemistry. Samuel and co-workers reported the measure of interactive forces between water and 20 different surfaces using the microbalance technique. Results showed that the wetting force correlates well to the advancing contact angle (θA), the larger the θA the lower the surface wettability. The adhesion force, measured when the water and surface first separates, correlates well to the receding contact angle (θR), the larger the θR the smaller the surface adhesion. The data also reveals that small residual water droplets are observed after the water droplet and the surface separate for surfaces with θR < 90°. This indicates high water affinity for these surfaces. No residual water droplet is observed for surfaces with θR > 90°. From the basic meaning of philicity-phobicity, θR∼90° is proposed as the new cut-off between hydrophilicity and hydrophobicity. The main driver for hydrophobicity is attributed to the high water surface tension. The merit of this proposed definition is discussed. Since wetting interaction becomes zero at θA ≥ 145°, surfaces with θR > 90° and θA ≥ 145° can further be defined as superhydrophobic. The extension of this approach to define oleophilicity/phobicity and superoleophobicity with hexadecane is discussed.

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18

Wen, Xin, Can He, Yuyan Hai, Xiaofan Liu, Rui Ma, Jianyu Sun, Xue Yang, Yunlong Qi, Jingyun Chen und Hui Wei. „Fabrication of a hybrid ultrafiltration membrane based on MoS2 modified with dopamine and polyethyleneimine“. RSC Advances 11, Nr. 42 (2021): 26391–402. http://dx.doi.org/10.1039/d1ra03697a.

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The hydrophobicity of ultrafiltration membranes is the main cause of membrane fouling and reduced permeability, so it is necessary to improve the hydrophilicity and anti-fouling performance of ultrafiltration membrane materials.

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19

Wang, Z. K., H. Y. Zheng, C. P. Lim und Y. C. Lam. „Polymer hydrophilicity and hydrophobicity induced by femtosecond laser direct irradiation“. Applied Physics Letters 95, Nr. 11 (14.09.2009): 111110. http://dx.doi.org/10.1063/1.3232212.

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20

Law, Kock-Yee. „Definitions for Hydrophilicity, Hydrophobicity, and Superhydrophobicity: Getting the Basics Right“. Journal of Physical Chemistry Letters 5, Nr. 4 (20.02.2014): 686–88. http://dx.doi.org/10.1021/jz402762h.

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21

Sun, Shuiyu, Dianzuo Wang und Bodan Li. „Hydrophobicity-hydrophilicity balance relationships for collectorless flotation of sulphide minerals“. Journal of Central South University of Technology 1, Nr. 1 (November 1994): 68–73. http://dx.doi.org/10.1007/bf02652088.

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22

He, Chenfeng, Frej Mighri, Michael D. Guiver und Serge Kaliaguine. „Tuning surface hydrophilicity/hydrophobicity of hydrocarbon proton exchange membranes (PEMs)“. Journal of Colloid and Interface Science 466 (März 2016): 168–77. http://dx.doi.org/10.1016/j.jcis.2015.12.023.

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23

Corsaro, Carmelo, Domenico Mallamace, Giulia Neri und Enza Fazio. „Hydrophilicity and hydrophobicity: Key aspects for biomedical and technological purposes“. Physica A: Statistical Mechanics and its Applications 580 (Oktober 2021): 126189. http://dx.doi.org/10.1016/j.physa.2021.126189.

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24

Qurrat-ul-Ain, Qurrat-ul-Ain, Sumaira Khurshid, Zarnab Gul, Jaweria Khatoon, Muhammad Raza Shah, Irum Hamid, Iffat Abdul Tawab Khan und Fariha Aslam. „Anionic azo dyes removal from water using amine-functionalized cobalt–iron oxide nanoparticles: a comparative time-dependent study and structural optimization towards the removal mechanism“. RSC Advances 10, Nr. 2 (2020): 1021–41. http://dx.doi.org/10.1039/c9ra07686g.

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Efficient and selective removal of azo dyes from water by amine-functionalized-CoFe₂O₄ nanoparticles reliant on structural features such as size, charge, hydrophobicity/hydrophilicity, and S/C atoms.

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25

Zhang, Lang, Jinfang Nie, Huili Wang, Juanhua Yang, Bingyue Wang, Yun Zhang und Jianping Li. „Instrument-free quantitative detection of alkaline phosphatase using paper-based devices“. Analytical Methods 9, Nr. 22 (2017): 3375–79. http://dx.doi.org/10.1039/c7ay00599g.

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A new method is proposed for the quantitative detection of alkaline phosphatase (ALP) by integrating paper microfluidics with an instrument-free length-measuring readout based on the ALP-caused hydrophilicity-to-hydrophobicity change in paper.

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26

Marcasuzaa, Pierre, Hongyao Yin, Yujun Feng und Laurent Billon. „CO2-Driven reversible wettability in a reactive hierarchically patterned bio-inspired honeycomb film“. Polymer Chemistry 10, Nr. 27 (2019): 3751–57. http://dx.doi.org/10.1039/c9py00488b.

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A triple structured honeycomb film is fabricated through block copolymer directed self-assembly in “Breath Figure” templating as a clickable patterned platform to enhance its reversible surface wettability between hydrophobicity and hydrophilicity upon a biological CO₂ trigger.

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27

Mant, Colin T., James M. Kovacs, Hyun-Min Kim, David D. Pollock und Robert S. Hodges. „Intrinsic amino acid side-chain hydrophilicity/hydrophobicity coefficients determined by reversed-phase high-performance liquid chromatography of model peptides: Comparison with other hydrophilicity/hydrophobicity scales“. Biopolymers 92, Nr. 6 (2009): 573–95. http://dx.doi.org/10.1002/bip.21316.

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28

Tsai, Shang-Tien, Wen-Chyuan ChangJean, Lin-Yi Huang und Tseng-Chang Tsai. „On the Anti-Corrosion Property of Dry-Gel-Conversion-Grown MFI Zeolite Coating on Aluminum Alloy“. Materials 13, Nr. 20 (15.10.2020): 4595. http://dx.doi.org/10.3390/ma13204595.

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MFI zeolite film coated on AA6061 alloy was prepared from fumed silica modified with/without n-octyldecyltrimethoxysilane (ODS) by means of dry gel conversion (DGC) method. The DGC-grown MFI zeolite film could form a strong barrier to protect AA6061 surface against the corrosion from NaCl solution. By using fumed silica as a starting material, the hydrophilicity and anti-corrosion capability of the MFI zeolite film declined with increasing humidity in the DGC synthesis. By silanization with ODS, the surface hydrophobicity of the MFI zeolite film increased, leading to substantial enhancement in anti-corrosion capability. On the other hand, MFI film grown from ODS-modified fumed silica exhibited low hydrophilicity and a much improved anti-corrosion protection property by four orders of magnitude, even stronger than the ODS post-treated MFI film. The strong anti-corrosion capability is attributed to the “thick layer” surface hydrophobicity of zeolite crystal.

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29

Kusdianto, Kusdianto, Masao Gen, Mitsuki Wada, Sugeng Winardi und I. Wuled Lenggoro. „Deposition of ultrasonic nebulized aerosols onto a hydrophilic surface“. Malaysian Journal of Fundamental and Applied Sciences 16, Nr. 3 (15.06.2020): 258–63. http://dx.doi.org/10.11113/mjfas.v16n3.1608.

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The effect of chemical treatment of a metallic substrate on the deposition of aerosols generated by an ultrasonic nebulizer was investigated. A single substrate with areas having different “level” of hydrophilicity (or hydrophobicity) was used as a model surface. The treated (more hydrophilic) area became more negatively-charged based on a surface electric potential meter. A low-pressure analysis method (electron-microscope image) and ordinary pressure methods (Raman spectroscopy and X-ray fluorescence) analytical results indicated that in comparison with the untreated area, the treated area trapped more particles in the case of the deposition of “wet” aerosols. In the case of the deposition of more “dry” aerosols, the untreated area trapped more particles rather than that of the treated one. The efficiency of particles deposition not only depended on the degree of hydrophilicity (or hydrophobicity) of the surface but also due to the conditions (wet or dry) of incoming aerosols.

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30

Chhabra, Pranshu, Ruchi Gupta, Gunjan Suri, Mukti Tyagi, Geetha Seshadri, S. Sabharwal, U. K. Niyogi und R. K. Khandal. „Studies on Development of Polymeric Materials Using Gamma Irradiation for Contact and Intraocular Lenses“. International Journal of Polymer Science 2009 (2009): 1–9. http://dx.doi.org/10.1155/2009/906904.

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For the development of materials for contact lenses and intraocular lenses, the selection criteria is based on the (i) capacity to absorb and retain water, (ii) hydrophilicity and hydrophobicity, (iii) refractive index and (iv) hardness besides the other essential properties. Various monomers are being studied to develop suitable materials for such applications. Selection of suitable monomers that can be converted into optical materials of desired characteristics is the most essential step. In the present paper, an attempt has been made to develop suitable optical polymers based on 2-hydroxy ethyl methacrylate (HEMA), N-vinyl pyrrolidone (NVP), methyl methacrylate (MMA), methacrylic acid (MAA), and styrene. Compositions were prepared in such a way that polymers of varying hydrophilicity or hydrophobicity could be obtained keeping HEMA as the base (main) monomer. For polymerization, gamma irradiation (Co-60 as a source) was used. The results of the study showed that: (i) an increase in NVP and MAA content brought in an increase in hydrophilicity of polymerized HEMA (pHEMA), while the addition of styrene and MMA decreased hydrophilicity of polymerized HEMA (pHEMA), (ii) polymers for contact lenses with water retention capacity as high as >50 wt.% and as low as <10 wt% with varying content of suitable comonomers can be designed, (iii) polymeric materials for contact lenses can be made by using radiation processing such as Co-60 and (iv) a dose of 40 kGy was found to be ideal for purpose.

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31

Xu, Fang, Mingjie Wei, Xin Zhang, Yang Song, Wei Zhou und Yong Wang. „How Pore Hydrophilicity Influences Water Permeability?“ Research 2019 (04.02.2019): 1–10. http://dx.doi.org/10.34133/2019/2581241.

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Membrane separation is playing increasingly important role in providing clean water. Simulations predict that membrane pores with strong hydrophobicity produce ultrahigh water permeability as a result of low friction. However, experiments demonstrate that hydrophilic pores favor higher permeability. Herein we simulate water molecules transporting through interlayers of two-dimensional nanosheets with various hydrophilicities using nonequilibrium molecular dynamics. We reveal that there is a threshold pressure drop (ΔPT), exceeding which stable water permeability appears. Strongly hydrophobic pores exhibit extremely high ΔPT, prohibiting the achievement of ultrahigh water permeability under the experimentally accessible pressures. Under pressures < ΔPT, water flows in hydrophobic pores in a running-stop mode because of alternative wetting and nonwetting, thus leading to significantly reduced permeability. We discover that hydrophilic modification to one surface of the nanosheet can remarkably reduce ΔPT by > 99%, indicating a promising strategy to experimentally realize ultrafast membranes.

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32

Xu, Fang, Mingjie Wei, Xin Zhang, Yang Song, Wei Zhou und Yong Wang. „How Pore Hydrophilicity Influences Water Permeability?“ Research 2019 (04.02.2019): 1–10. http://dx.doi.org/10.1155/2019/2581241.

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Membrane separation is playing increasingly important role in providing clean water. Simulations predict that membrane pores with strong hydrophobicity produce ultrahigh water permeability as a result of low friction. However, experiments demonstrate that hydrophilic pores favor higher permeability. Herein we simulate water molecules transporting through interlayers of two-dimensional nanosheets with various hydrophilicities using nonequilibrium molecular dynamics. We reveal that there is a threshold pressure drop (ΔPT), exceeding which stable water permeability appears. Strongly hydrophobic pores exhibit extremely high ΔPT, prohibiting the achievement of ultrahigh water permeability under the experimentally accessible pressures. Under pressures < ΔPT, water flows in hydrophobic pores in a running-stop mode because of alternative wetting and nonwetting, thus leading to significantly reduced permeability. We discover that hydrophilic modification to one surface of the nanosheet can remarkably reduce ΔPT by > 99%, indicating a promising strategy to experimentally realize ultrafast membranes.

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33

Lim, Kyung-Bum, Tae-Ho Roh und Jae-Oy Lee. „Analysis on the Surface Hydrophilicity & Hydrophobicity Mechanism of Polymer Composites“. Journal of the Korea Academia-Industrial cooperation Society 14, Nr. 7 (31.07.2013): 3437–43. http://dx.doi.org/10.5762/kais.2013.14.7.3437.

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34

Tauer, Klaus, A. M. Imroz Ali, Ufuk Yildiz und Milos Sedlak. „On the role of hydrophilicity and hydrophobicity in aqueous heterophase polymerization“. Polymer 46, Nr. 4 (Februar 2005): 1003–15. http://dx.doi.org/10.1016/j.polymer.2004.11.036.

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35

Chen, Junhong, Famin Zhai, Meng Liu, Xinmei Hou und Kuo-Chih Chou. „SiC Nanowires with Tunable Hydrophobicity/Hydrophilicity and Their Application as Nanofluids“. Langmuir 32, Nr. 23 (02.06.2016): 5909–16. http://dx.doi.org/10.1021/acs.langmuir.6b00430.

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36

Pérez-Conesa, S., Pablo M. Piaggi und Michele Parrinello. „A local fingerprint for hydrophobicity and hydrophilicity: From methane to peptides“. Journal of Chemical Physics 150, Nr. 20 (28.05.2019): 204103. http://dx.doi.org/10.1063/1.5088418.

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37

Ohkubo, Kota, Keiya Yanagisawa, Akio Kamimura und Kenta Fujii. „Physicochemical and Structural Properties of a Hydrophobicity/Hydrophilicity Switchable Ionic Liquid“. Journal of Physical Chemistry B 124, Nr. 18 (15.04.2020): 3784–90. http://dx.doi.org/10.1021/acs.jpcb.0c02067.

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38

Yang, Hao, Qin Wang, Wei Chen, Yanbing Zhao, Tuying Yong, Lu Gan, Huibi Xu und Xiangliang Yang. „Hydrophilicity/Hydrophobicity Reversable and Redox-Sensitive Nanogels for Anticancer Drug Delivery“. Molecular Pharmaceutics 12, Nr. 5 (09.04.2015): 1636–47. http://dx.doi.org/10.1021/acs.molpharmaceut.5b00068.

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39

Marinsky, Jacob A., Hiroki Kodama und Tohru Miyajima. „An Approach for Assessment of the Hydrophobicity/Hydrophilicity of Charged Polymers“. Journal of Physical Chemistry B 102, Nr. 36 (September 1998): 6949–57. http://dx.doi.org/10.1021/jp980982i.

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40

Xia, Fan, Ying Zhu, Lin Feng und Lei Jiang. „Smart responsive surfaces switching reversibly between super-hydrophobicity and super-hydrophilicity“. Soft Matter 5, Nr. 2 (2009): 275–81. http://dx.doi.org/10.1039/b803951h.

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41

Ten, G. N., A. A. Yakovleva und V. I. Baranov. „Theoretical study of hydrophobicity and hydrophilicity of indole, skatole, and ethanole“. Journal of Structural Chemistry 54, Nr. 6 (November 2013): 1018–28. http://dx.doi.org/10.1134/s0022476613060048.

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42

Ten, G. N., D. M. Kadrov und V. I. Baranov. „Theoretical study of hydrophobicity and hydrophilicity of uracil and its dimers“. Biophysics 59, Nr. 4 (September 2014): 537–45. http://dx.doi.org/10.1134/s0006350914040241.

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43

Jeffrey, Matthew, und Ronald Woods. „Investigation of Hydrophobicity/Hydrophilicity Transitions with an Electrochemical Quartz Crystal Microbalance“. Journal of The Electrochemical Society 148, Nr. 2 (2001): E79. http://dx.doi.org/10.1149/1.1341238.

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44

Zhang, Dong-Hao, Li-Xia Yuwen, Yu-Lei Xie, Wei Li und Xiao-Bing Li. „Improving immobilization of lipase onto magnetic microspheres with moderate hydrophobicity/hydrophilicity“. Colloids and Surfaces B: Biointerfaces 89 (Januar 2012): 73–78. http://dx.doi.org/10.1016/j.colsurfb.2011.08.031.

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45

Sackey, J., B. T. Sone, K. A. Dompreh und M. Maaza. „Wettability Property In Natural Systems: A Case of Flying Insects“. MRS Advances 3, Nr. 42-43 (2018): 2697–703. http://dx.doi.org/10.1557/adv.2018.367.

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AbstractRecently, scientists have demonstrated that material surfaces in nature that possess special wettability properties are composed of micro- and nanostructures. In this study, we focused on the importance of surface structures in determining the wettability of wings of the flying insect species: Idea malabarica, Lucilia sericata and Chrysomya marginalis. Scanning Electron Microscopy (SEM) analysis indicates the different nano-/micro- structures identified on the wings. Surface roughness which plays a role in influencing the wettability was theoretically estimated from the SEM images. While the spherical liquid water droplets used for testing wettability were observed to float on the surface of the Idea malabarica and Lucilia sericata wings, the surface of the Chrysomya marginalis wing was made completely wet. The super-hydrophobicity of the Idea malabarica wing as compared to the near-hydrophobicity/mild hydrophilicity of the Lucilia sericata wing and the distinct hydrophilicity of the Chrysomya marginilis wing could be attributed to its complicated composition of nano-/microstructures and higher surface roughness value.

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Xing, Linan, Theodore Lo, Rolando Fabris, Christopher W. K. Chow, John van Leeuwen, Mary Drikas und Dongsheng Wang. „Using reverse phase high performance liquid chromatography as an alternative to resin fractionation to assess the hydrophobicity of natural organic matter“. Water Science and Technology 66, Nr. 11 (01.12.2012): 2402–9. http://dx.doi.org/10.2166/wst.2012.448.

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Resin fractionation is the most widely used technique to isolate and characterize natural organic matter (NOM) based on its hydrophobicity and hydrophilicity, however, it is also recognized as a time consuming technique. This paper describes the use of reverse phase high performance liquid chromatography (RPHPLC) as a rapid assessment technique to determine the hydrophobicity/hydrophilicity of NOM. The optimum column separation condition was achieved and without the need for concentrating the sample prior to analysis and with good reproducibility of the peak retention time and the peak area. The characterization results were further compared with the traditional resin fractionation technique using DAX-8 and XAD-4 resins. The results demonstrated that the polarities defined by the two methods were different but consistent and also that the fractions absorbed onto XAD-4 were less hydrophobic than those absorbed onto DAX-8. The difference in definition between resin fractionation and RPHPLC were further investigated.

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Petrenko, V. F., und S. Peng. „Reduction of ice adhesion to metal by using self-assembling monolayers (SAMs)“. Canadian Journal of Physics 81, Nr. 1-2 (01.01.2003): 387–93. http://dx.doi.org/10.1139/p03-014.

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A new method has been developed to study the role of hydrogen bonding in ice adhesion and to minimize the effect of this mechanism on ice adhesion. Metals were coated with a mono-molecular layer that had either strong hydrophobic properties or strong hydrophilic properties. Self-assembling monolayers (SAMs) of varying degrees of hydrophobicity/hydrophilicity were created by mixing the hydrophobic and hydrophilic components. The SAM structure and quality were examined using atomic force microscopy, and the degree of the SAM hydrophobicity/hydrophilicity was characterized by the contact angle of water on the monolayer surfaces. Then, water was frozen on the top of the SAM and the shear strength of the interface between ice and SAM was measured. A good correlation between the contact angle of water and the ice adhesion strength was shown and the fraction of ice adhesion caused by hydrogen bonding was determined. It is revealed that hydrogen bonding significantly enhances ice adhesion. PACS No.: 61

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Liu, Xiao, Xiaofei Song, Ziming Wang, Chunlei Xia, Ting Li, Xiaoning Li, Qian Xu, Suping Cui und Shanshan Qian. „Polymer for Internal Hydrophobization of Cement-Based Materials: Design, Synthesis, and Properties“. Polymers 13, Nr. 18 (11.09.2021): 3069. http://dx.doi.org/10.3390/polym13183069.

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A series of novel comb-like poly(butyl acrylate)-g-poly(dimethylaminoethyl methacrylate) (PBA-g-PDMAEMA) with different side chain lengths were designed and successfully synthesized by the “first main chain then side chain” method. Infrared Spectroscopy (IR), 1H Nuclear Magnetic Resonance (1H NMR), and gel permeation chromatography (GPC) were used for structural confirmation and molecular weight characterization. This polymer exhibited responsive behavior from hydrophilicity to hydrophobicity under the alkaline environment of cement-based materials, with the contact angle of 105.6°, a decreased evaporation rate, and a hydrophile–lipophile balance (HLB) value. A significant internal hydrophobic effect on cement mortar was shown in the water absorption rate, which decreased by 75.2%, and a dry shrinkage-reducing rate of more than 30%. Furthermore, this polymer can effectively slow the exothermic rate, reduce the heat release, and delay the exothermic peak of cement hydration. It was interesting that these properties showed a direct correlation with the side chain length of the comb polymer. The aims of this study are to provide a new avenue to synthesize polymers with the spontaneous hydrophilicity–hydrophobicity transition in the cement system, achieving excellent internal hydrophobicity of cement-based materials, and to offer a promising alternative to resist external erosion for improving the durability and service life of cement-based materials.

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Su, Wei-Chen, und Shiao-Wei Kuo. „Reversible Surface Properties of Polybenzoxazine/Silica Nanocomposites Thin Films“. Journal of Nanomaterials 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/453623.

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We report the reversible surface properties (hydrophilicity, hydrophobicity) of a polybenzoxazine (PBZ) thin film through simple application of alternating UV illumination and thermal treatment. The fraction of intermolecularly hydrogen bonded O–H⋯O=C units in the PBZ film increased after UV exposure, inducing a hydrophilic surface; the surface recovered its hydrophobicity after heating, due to greater O–H⋯N intramolecular hydrogen bonding. Taking advantage of these phenomena, we prepared a PBZ/silica nanocomposite coating through two simple steps; this material exhibited reversible transitions from superhydrophobicity to superhydrophilicity upon sequential UV irradiation and thermal treatment.

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Mao, Quan-Xing, Wen-Jing Wang, Xin Hai, Yang Shu, Xu-Wei Chen und Jian-Hua Wang. „The regulation of hydrophilicity and hydrophobicity of carbon dots via a one-pot approach“. Journal of Materials Chemistry B 3, Nr. 29 (2015): 6013–18. http://dx.doi.org/10.1039/c5tb00963d.

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The hydrophilicity or hydrophobicity of carbon dots is regulated by varying the H₃PO₄/ethanol molar ratio, via a hydrothermal process with 1-butyl-3-methylimidazolium hexafluorophosphate as the carbon source in a H₃PO₄–ethanol medium.

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