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4 article(s) from Zhao, Xuezeng

Rapid, ultraviolet-induced, reversibly switchable wettability of superhydrophobic/superhydrophilic surfaces

Yunlu Pan,
Wenting Kong,
Bharat Bhushan and
Xuezeng Zhao

Beilstein J. Nanotechnol. 2019, 10, 866–873, doi:10.3762/bjnano.10.87

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Figure 1: SEM images of TiO₂–PFOS and Al₂O₃–PFOS composite surfaces.

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Figure 2: FTIR spectra of TiO₂ and TiO₂–PFOS, Al₂O₃ and Al₂O₃–PFOS.

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Figure 3: (a) Contact angle and FTIR spectrum of the TiO₂–PFOS surface under different treatment conditions. ...

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Figure 4: (a) Contact angle and FTIR spectrum of the Al₂O₃–PFOS surface under different treatment conditions....

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Figure 5: The possible mechanism describing the transition of TiO₂ and PFOS under UV illumination and heating....

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Figure 6: Reversible superhydrophobic/superhydrophilic switching of the composite surface under UV illuminati...

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Full Research Paper

Published 15 Apr 2019

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Interface conditions of roughness-induced superoleophilic and superoleophobic surfaces immersed in hexadecane and ethylene glycol

Yifan Li,
Yunlu Pan and
Xuezeng Zhao

Beilstein J. Nanotechnol. 2017, 8, 2504–2514, doi:10.3762/bjnano.8.250

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Figure 1: Schematic illustration of the preparation procedures for the superoleophilic samples. The dashed ar...

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Figure 2: Schematic illustration of a rough surface. The parameters of the profile defined here are the mean ...

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Figure 3: Schematic illustration of a slip-length measurement by using a colloidal AFM probe in contact mode....

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Figure 4: Schematic illustrating possible definitions of the boundary-slip condition at a rough surface. (a) ...

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Figure 5: Confocal laser scanning images in the air, and measured values of RMS and R_z roughness of (a) super...

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Figure 6: Hydrodynamic force F_hydro and V/F_hydro of a borosilicate sphere on superoleophilic surfaces a1 to a...

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Figure 7: Measured slip length on (a) superoleophilic and (b) superoleophobic surfaces with varying values of...

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Figure 8: Effective slip length on superoleophilic and superoleophobic surfaces with varying values of RMS ro...

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Figure 9: Hydrodynamic force F_hydro and V/F_hydro of a borosilicate sphere on superoleophobic surfaces b1 to b...

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Full Research Paper

Published 27 Nov 2017

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Characterization of spherical domains at the polystyrene thin film–water interface

Khurshid Ahmad,
Xuezeng Zhao,
Yunlu Pan and
Danish Hussain

Beilstein J. Nanotechnol. 2016, 7, 581–590, doi:10.3762/bjnano.7.51

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Figure 1: Topographic image of a typical PS-coated surface. The roughness average (R_a) was 0.27 nm, the root ...

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Figure 2: (a) AFM image of micro/nano spherical domains on a PS-coated surface, immersed in DI water. A numbe...

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Figure 3: (a) Summary of the contact angle versus the radius/lateral size of the spherical objects. (b) Summa...

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Figure 4: Optical images of the coalescence of spherical domains formed on PS-coated surfaces. (a–d) Time lap...

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Figure 5: Height images of spherical objects on PS-coated surfaces obtained using (a) contact mode (b) tappin...

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Figure 6: Section analysis of spherical domains imaged in contact mode and tapping mode (shown in Figure 5). (a) Sect...

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Figure 7: (a) Approach and retraction curves for a spherical object. (b) Approach and retraction curves for a...

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Figure 8: (a) Height image of spherical domains. (b) Phase image of spherical domains. A clear phase contrast...

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Figure 9: AFM topographic and phase images of PS-coated surfaces obtained in air and water. (a,b) Topographic...

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Figure 10: (a,b) AFM images of the PS-coated surface before and after the exposure to water, respectively. (c,...

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Figure 11: Optical images of blisters formed on a PS-coated surface immersed in (a) DI water and (b) ethanol.

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Supp Info

Full Research Paper

Published 20 Apr 2016

Full text

The study of surface wetting, nanobubbles and boundary slip with an applied voltage: A review

Yunlu Pan,
Bharat Bhushan and
Xuezeng Zhao

Beilstein J. Nanotechnol. 2014, 5, 1042–1065, doi:10.3762/bjnano.5.117

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Figure 1: (a) Flow chart showing some applications of oxygenated nanobubbles. Reproduced with permission from ...

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Figure 2: Schematic of the model of a channel formed by two infinitely parallel surfaces separated with a dis...

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Figure 3: Schematic showing advancing and receding contact angle. Contact angle hysteresis is equal to the di...

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Figure 4: Schematic of the experimental setup used for the measurement of the CA as a function of applied vol...

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Figure 5: DC voltage dependence of the shape and CA of the droplet. The voltage was varied from 0 to 30 V, an...

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Figure 6: (a) The CA of the droplet and its cosine value as functions of applied DC voltage. Equation 5 was used to fit...

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Figure 7: Schematic of the balance of forces at the contact line between surface and water with applied volta...

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Figure 8: Frequency dependence of the shape and CA of the droplet. The peak-to-peak value of the AC voltage i...

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Figure 9: The CA and CAHs of the droplet as function of the frequency of an AC voltage with a peak-to-peak va...

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Figure 10: Schematic of the balance of forces of a nanobubble at the contact line between surface and water wi...

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Figure 11: Schematic of the experimental setup used for imaging nanobubbles with applied voltage.

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Figure 12: Nanobubbles in DI water, saline, saline 1 and saline 2 on PS surface imaged by using AFM. (a) Heigh...

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Figure 13: Height images and corresponding histograms of the size distribution of nanobubbles on PS surface wi...

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Figure 14: Height images and corresponding histograms of the size distribution of nanobubbles on PS surface wi...

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Figure 15: Height images and corresponding histograms of the size distribution of nanobubbles on PS surface wi...

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Figure 16: Geometrical distribution of nanobubbles as a function of applied voltage on PS surface in DI water ...

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Figure 17: Electrostatic forces on initial PS surface and pretreated PS surface in DI water.

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Figure 18: Height images and corresponding histograms of the size distribution of nanobubbles on the initial P...

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Figure 19: AFM Images, surface roughness and contact angle data of OTS surface in air. Reproduced with permiss...

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Figure 20: Process of making clean colloidal probe (described in the text).

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Figure 21: The effect of EDL on the volumetric flow rate. Q₀ is the flow rate without considering the slippage...

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Figure 22: (a) Electrostatic force in DI water with different negative voltages, −5 V and −10 V, applied to th...

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Figure 23: Schematic of the explanation for the results of electrostatic force measurement with positive volta...

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Figure 24: (a) Hydrodynamic force with high driving velocity (77 μm/s) on a silicon surface and an OTS surface...

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Figure 25: V/F_hydro of the sphere with high driving velocity (77 μm/s) on a silicon surface and an OTS surface...

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Figure 26: Measured slip lengths with different positive voltages applied to the substrate. Reproduced with pe...

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Figure 27: Electrostatic force in DI water and in saline with different positive voltages applied to the subst...

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Figure 28: V/F_hydro plot of the sphere with high driving velocity (77 μm/s) on a silicon surface, an OTS surfa...

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Figure 29: Summary of the experimental results for the influence of applied voltages on the surface wetting, n...

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Figure 30: Schematic of the relationship between surface charge, boundary slip, nanobubbles and the drag of li...

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Review

Published 15 Jul 2014

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