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Switchable hydrophobic-hydrophilic layer obtained onto porous alumina by plasma-enhanced fluorination

Science China(Technological Sciences) 2009年第1期52卷 104-110页

作者： A. TRESSAUD C. LABRUGèRE E. DURAND C. BRIGOULEIX H. ANDRIESSEN Institute of Condensed Matter Chemistry of Bordeaux (ICMCB-CNRS) University Bordeaux 1 87 Avenue du Dr. A. Schweitzer AGFA GEVAERT NV Septestraat 27

Conventional lithographic printing processes using porous alumina for offset applications generally use "wet" routes. Recently "dry" processes have been developed which are based on a heat-induced hydrophilic/oleophilic conversion of one or more layers of the coating so that a stronger affinity to-wards ink or water fountain is created at the exposed areas with respect to the surface of the unex-posed coating. Treatments involving rf plasma-enhanced fluorination (PEF) constitute exceptional tools for modifying the surface properties of materials. Many advantages of these techniques can be indeed outlined, when compared to more conventional methods: room-temperature reactions, chemical modi-fications limited to surface only without changing the bulk properties, possible non-equilibrium reac-tions. The influence of PEF treatments on porous alumina layer used in printing plates has been tested with various fluorinated gases (CF4, C3F8 and C4F8) and characterized by XPS. The hydrophobic prop-erties of the fluorinated layer have been deduced from contact angle measurements. Using C4F8 rf-PEF treatment, the outmost surface of the hydrophilic alumina substrate used for lithographic printing is hydrophobized, or in other words, the hydrophilic substrate is converted into a support with hydro-phobic properties. Once being hydrophobized, the surface layer may be rendered hydrophilic using a heat pulse, thus giving rise to switchable hydrophobic-hydrophilic properties of the material.

关键词： porous alumina rf-plasma fluorination offset applications hydrophobic-hydrophilic switchable layer XPS contact angle

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Switchable hydrophobic-hydrophilic layer obtained onto porous alumina by plasma-enhanced fluorination

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中国科学:技术科学 2010年第4期 443-443页

作者： A.TRESSAUD C.LABRUGèRE E.DURAND C.BRIGOULEIX H.ANDRIESSEN Institute of Condensed Matter Chemistry of Bordeaux(ICMCB-CNRS) University Bordeaux 1 Agfa Gevaert NV Septestraat

Conventional lithographic printing processes using porous alumina for offset applications generally use"wet"routes. Recently"dry"processes have been developed which are based on a heat-induced hydrophilic/oleophilic conversion of one or more layers of the coating so that a stronger affinity towards ink or water fountain is created at the exposed areas with respect to the surface of the unexposed *** involving rf plasma-enhanced fluorination(PEF) constitute exceptional tools for modifying the surface properties of *** advantages of these techniques can be indeed outlined,when compared to more conventional methods:room-temperature reactions,chemical modifications limited to surface only without changing the bulk properties,possible non-equilibrium *** influence of PEF treatments on porous alumina layer used in printing plates has been tested with various fluorinated gases(CF4,C3F8 and C4F8) and characterized by *** hydrophobic properties of the fluorinated layer have been deduced from contact angle *** C4F8 rf-PEF treatment,the outmost surface of the hydrophilic alumina substrate used for lithographic printing is hydrophobized,or in other words,the hydrophilic substrate is converted into a support with hydrophobic *** being hydrophobized,the surface layer may be rendered hydrophilic using a heat pulse,thus giving rise to switchable hydrophobic-hydrophilic properties of the material.

关键词： porous alumina rf-plasma fluorination offset applications hydrophobic-hydrophilic switchable layer XPS contact angle

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hydrophilic and hydrophobic competition in water-methanol solutions

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Science China(Physics,Mechanics & Astronomy) 2019年第10期62卷 8-15页

作者： Domenico Mallamace Sow-Hsin Chen Carmelo Corsaro Enza Fazio Francesco Mallamace HEugene Stanley Dipartimento MIFT Universita di MessinaMessina 1-98166Italy Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridge MA 02139USA Istituto dei Sistemi Complessi(ISC)-CNR Rome 00185Italy Center for Polymer Studies and Department of Physics Boston UniversityBoston MA 02215USA

We study the thermal behavior of the longitudinal spin-lattice, T1, and the transverse spin-spin, T2, relaxation times of the macroscopic magnetization in water/methanol solutions. Our aim is to investigate the reciprocal influence of hydrophobic effects on water properties and of hydrophilicity（via hydrogen bond, HB, interactions） on the solute. Using classical Nuclear Magnetic Resonance spectroscopy, we find a single characteristic correlation time τcthat reflects all local structural configurations and characterizes the thermal motion effects of the magnetic nuclei on the spin-spin interaction. We find that in the supercooled regime the correlations are stronger, with respect to ambient temperature, because the HB interactions have a lifetime long enough to sustain a stable water network. However, increasing the temperature, progressively decreases the HB interaction lifetime and destroys the water clusters with a consequent decoupling in the dynamic modes of the system. In addition, at temperatures higher than about 265 K, the hydrophobicity becomes gradually stronger and governs the physical properties of the solutions.

关键词： hydrophobic-hydrophilic interactions water systems thermal properties

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