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6 article(s) from Pan, Yunlu

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

Full text

Optimal fractal tree-like microchannel networks with slip for laminar-flow-modified Murray’s law

Dalei Jing,
Shiyu Song,
Yunlu Pan and
Xiaoming Wang

Beilstein J. Nanotechnol. 2018, 9, 482–489, doi:10.3762/bjnano.9.46

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Figure 1: Simplified schematic of the no-slip and slip conditions. ν_lw is the relative velocity between the w...

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Figure 2: Schematic of a self-similar fractal tree-like microchannel network with branching number N = 2 and ...

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Figure 3: The dimensionless hydraulic resistance of laminar flow in a fractal tree-like microchannel network ...

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Figure 4: The optimal diameter ratio to achieve minimum hydraulic resistance versus (a) the branching number N...

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Full Research Paper

Published 08 Feb 2018

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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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The effect of the electrical double layer on hydrodynamic lubrication: a non-monotonic trend with increasing zeta potential

Dalei Jing,
Yunlu Pan and
Xiaoming Wang

Beilstein J. Nanotechnol. 2017, 8, 1515–1522, doi:10.3762/bjnano.8.152

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Figure 1: The schematic of hydrodynamic lubrication in a 1D slider bearing considering the effect of the EDL. ...

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Figure 2: Dimensionless electrical potential distribution obtained by solving the linear PBE and the nonlinea...

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Figure 3: The effect of the zeta potential on the apparent viscosity of the lubricant based on different assu...

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Figure 4: The effect of the zeta potential on the apparent viscosity of the lubricant and the dependence of t...

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Figure 5: Comparison of the hydrodynamic load capacity of the lubricant including the effect of the zeta pote...

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Figure 6: The effect of zeta potential on the hydrodynamic load capacity of the lubricant and the dependence ...

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Full Research Paper

Published 25 Jul 2017

Full text

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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