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Sartori P, Ferraro D, Pierno M, Mistura G. Resonance Modes of Water Drops Pinned to a Vibrating Rectangular Post. MICROMACHINES 2024; 15:634. [PMID: 38793206 PMCID: PMC11122966 DOI: 10.3390/mi15050634] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 04/30/2024] [Accepted: 05/07/2024] [Indexed: 05/26/2024]
Abstract
We studied the effects of vertical vibrations on a water drop that was pinned to the sharp edges of a rectangular post. By varying the frequency and amplitude of the vertical displacement, distinct resonance peaks were observed using a simple optical technique. The vibrational spectra of the first two modes exhibited two closely spaced peaks, which corresponded to standing waves that exist along the major and minor contour lengths of the drops. The values of the resonance frequencies can be explained rather well by a simple model, which was originally proposed for axially symmetric drops.
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Affiliation(s)
| | | | | | - Giampaolo Mistura
- Department of Physics and Astronomy, University of Padua, Via Marzolo 8, 35131 Padua, Italy; (P.S.); (D.F.); (M.P.)
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2
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He J, Huang C, Liu C, Wu P, Jiang W. Preparation of Oriented Superhydrophobic Surface to Reduce Agglomeration in Preparing Melt Marbles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 38319711 DOI: 10.1021/acs.langmuir.3c03583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Numerous innovative granulation techniques utilizing the concept of liquid marbles have been proposed before. However, these processes frequently encounter issues such as collisions, aggregation, and fragmentation of liquid/melt marble during the granulation process. In this study, the oriented superhydrophobic surface (OSS) was successfully prepared by utilizing copper wire to solve the above problem, facilitating efficient batch production and guided transportation of uniform marbles. The parameters and mechanisms of this process were thoroughly studied. The optimized structure is that the copper wire spacing (d) and height (h) are set as 1.0 and 0.1 mm, respectively. This resulted in a surface contact angle (CA) of 156° and anisotropic sliding (ΔSA) of 16.3 ± 1.34°. Using the prepared substrate, high-quality urea products were successfully obtained through the controlled transport of urea melt marbles. The mechanism of guided and directional drag reduction, based on the solid/solid contact on the surface, is proposed. These findings in this study have significant implications for improving granulation processes.
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Affiliation(s)
- Jian He
- Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Chunni Huang
- Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Changjun Liu
- Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Pan Wu
- Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
| | - Wei Jiang
- Low-Carbon Technology and Chemical Reaction Engineering Laboratory, School of Chemical Engineering, Sichuan University, Chengdu 610065, P.R. China
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3
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Rani D, Sarkar S. Drying behaviour of nanofluid sessile droplets on self-affine vis-à-vis corrugated nanorough surfaces. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2023; 46:113. [PMID: 37999793 DOI: 10.1140/epje/s10189-023-00374-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2023] [Accepted: 10/24/2023] [Indexed: 11/25/2023]
Abstract
In recent years, evaporative self-assembly of sessile droplets has gained considerable attention owing to its wide applicability in many areas. While the phenomenon is well studied for smooth and isotropically rough (self-affine) surfaces, investigations comparing the outcomes on self-affine vis-à-vis corrugated surfaces remains to be done. In this experimental work, we compare the wetting and evaporation dynamics of nano-colloidal microlitre droplets on self-affine and corrugated nanorough surfaces having identical roughnesses and interface properties. The coupled influence of particle size, concentration, and surface structuring has been explored. Differences in wettability and evaporation dynamics are observed, which are explained via the interaction between wetting fluid and anisotropic surface roughness. Our findings exhibit different temporal behaviour of contact radius and angle in the evaporation process of the droplets. Further, the corrugated surface exhibits anisotropic wettability with a monotonic change in droplet shape as evaporation proceeds, finally giving rise to irregular dried patterns. The scaled rim width and crack spacing of the particulate deposits are examined. Our results can inspire fabrication of surfaces that can facilitate direction-dependent droplet motion for specific applications.
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Affiliation(s)
- Deeksha Rani
- Surface Modification and Applications Laboratory (SMAL), Department of Physics, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab, 140001, India
| | - Subhendu Sarkar
- Surface Modification and Applications Laboratory (SMAL), Department of Physics, Indian Institute of Technology Ropar, Nangal Road, Rupnagar, Punjab, 140001, India.
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4
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Mekawy M, Hiroi T, Tenjimbayashi M, Kawakita J. Wetting behavior of a water droplet on a mutual periodic micro-patterned ternary texture structure. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Zhang Q, Bai X, Li Y, Zhang X, Tian D, Jiang L. Ultrastable Super-Hydrophobic Surface with an Ordered Scaly Structure for Decompression and Guiding Liquid Manipulation. ACS NANO 2022; 16:16843-16852. [PMID: 36222751 DOI: 10.1021/acsnano.2c06749] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Directional droplet manipulation is very crucial in microfluidics, intelligent liquid management, etc. However, excessive liquid pressure tends to destroy the solid-gas-liquid (SAL) composite interface, creating a highly adhesive surface, which is not conducive to liquid transport. Herein, we propose a strategy to enhance the surface durability, in which the surface cannot withstand liquid pressure only by "blocking" but must instead guide liquid transport for "decompression". Learning from the water resistance of water strider legs and the drag reduction of shark skin, we present a continuous integrated system to obtain an ultrastable super-hydrophobic surface with a highly ordered scaly structure via a liquid flow-induced alignment method for lossless unidirectional liquid transport. The nonwetting scaly structure can both buffer liquid pressure and drive droplet motion to further reduce the vertical pressure of the liquid. Moreover, droplets can be manipulated unidirectionally using a voice. This work could aid in manufacturing scalable anisotropic micro-nanostructure surfaces, which inspires efforts in realizing lossless continuous liquid control on demand and related microfluidic applications.
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Affiliation(s)
- Qiuya Zhang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing100191, P. R. China
- School of Physics, Beihang University, Beijing100191, P. R. China
| | - Xiuhui Bai
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing100191, P. R. China
| | - Yan Li
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing100191, P. R. China
| | - Xiaofang Zhang
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing100083, P. R. China
| | - Dongliang Tian
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing100191, P. R. China
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing100191, P. R. China
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry, Beihang University, Beijing100191, P. R. China
- Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing100191, P. R. China
- Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing100191, P. R. China
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6
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Yang XY, Li GH, Huang X, Yu YS. Evaporative Deposition of Surfactant-Laden Nanofluid Droplets over a Silicon Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:11666-11674. [PMID: 36097700 DOI: 10.1021/acs.langmuir.2c01564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Morphologies of evaporative deposition, which has been widely applied in potential fields, were induced by the competition between internal flows inside evaporating droplets. Controlling the pattern of deposition and suppressing the coffee-ring effect are essential issues of intense interest in the aspects of industrial technologies and scientific applications. Here, evaporative deposition of surfactant-laden nanofluid droplets over silicon was experimentally investigated. A ring-like deposition was formed after complete evaporation of sodium dodecyl sulfate (SDS)-laden nanofluid droplets with an initial SDS concentration ranging from 0 to 1.5 CMC. In the case of initial SDS concentrations above 1.3 CMC, no cracks were observed in the ring-like deposition, indicating that the deposition patterns of nanofluid droplets could be completely changed and cracks could be eliminated by sufficient addition of SDS. With the increase of the initial concentration of hexadecyl trimethylammonium bromide (CTAB), the width of the deposition ring gradually decreased until no ring-like structure was formed. On the contrary, with the increase of the initial Triton X-100 (TX-100) concentration, the width of the deposition ring gradually increased until a uniform deposition was generated. Moreover, when the initial TX-100 concentration was high, a "tree-ring-like" pattern was discovered. Besides, morphologies of evaporative pattern due to the addition of surfacants were qualitatively analyzed.
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Affiliation(s)
- Xiao-Ye Yang
- Department of Mechanics, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, P. R. China
| | - Guo-Hao Li
- Department of Mechanics, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, P. R. China
| | - Xianfu Huang
- State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Ying-Song Yu
- Department of Mechanics, School of Civil Engineering, Architecture and Environment, Hubei University of Technology, Wuhan 430068, P. R. China
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7
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Jiang G, Tian Z, Wang L, Luo X, Chen C, Hu X, Peng R, Zhang H, Zhong M. Anisotropic Hemiwicking Behavior on Laser Structured Prismatic Microgrooves. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6665-6675. [PMID: 35578803 DOI: 10.1021/acs.langmuir.2c00568] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The wicking phenomenon, including wicking and hemiwicking, has attracted increasing attention for its critical importance to a wide range of engineering applications, such as thermal management, water harvesting, fuel cells, microfluidics, and biosciences. There exists a more urgent demand for anisotropic wicking behaviors since an increasing number of advanced applications are significantly complex. For example, special-shaped vapor chambers and heating atomizers in some electronic cigarettes need liquid replenishing with various velocities in different directions. Here, we report two-dimensional anisotropic hemiwicking behaviors with elliptical shapes on laser structured prismatic microgrooves. The prismatic microgrooves were fabricated via one-step femtosecond laser direct writing, and the anisotropic hemiwicking behaviors were observed when utilizing glycerol, glycol, and water as the test liquid. Specifically, the ratios of horizontal wicking distance in directions along short and long axes were tan 0°, tan 15°, tan 30°, and tan 45° for samples with cross-angles of 0°, 30°, 60°, and 90°, respectively. The vertical water wicking front displayed corresponding angles under the guidance of laser structured prismatic microgrooves. Theoretical analysis shows that the wicking distance is mainly dependent on the cross-angle θ and surface roughness, in which the wicking distance is proportional to cos(θ/2). Driven by the capillary pressure forming in the narrow microgrooves, the liquid initially filled the valleys of microgrooves and then surrounded and covered the prismatic ridges with laser-induced nanoparticles. The abundant nanoparticles increased the surface roughness, leading to the enhancement of wicking performance, which was further evidenced by the larger wicking speed of the sample with more nanoparticles. The mechanism of anisotropic hemiwicking behaviors revealed in this work paves the way for wicking control, and the proposed prismatic microgrooved surfaces with two-dimensional anisotropic hemiwicking performance and superhydrophilicity could serve in a broad range of applications, especially for the advanced thermal management with specific heat load configurations.
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Affiliation(s)
- Guochen Jiang
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Ze Tian
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Lizhong Wang
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Xiao Luo
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Changhao Chen
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Xinyu Hu
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Rui Peng
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Hongjun Zhang
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
| | - Minlin Zhong
- Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Key Laboratory for Advanced Materials Processing Technology, Ministry of Education, Beijing 100084, P. R. China
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8
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Tonini S, Cossali GE. Analytical modeling of the evaporation of sessile drop linear arrays. Phys Rev E 2022; 105:054803. [PMID: 35706302 DOI: 10.1103/physreve.105.054803] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2022] [Accepted: 04/28/2022] [Indexed: 06/15/2023]
Abstract
An analytical model for predicting the competitive evaporation of two and three sessile drops is proposed, based on an analytical solution, in terms of Mehler functions, of the steady species and energy conservation equations for the gaseous phase. The assessment through a comparison with accurate numerical solutions of the species conservation equations is reported in order to quantify the accuracy of the analytical solution. The model is validated against three available sets of experiments on two and three sessile drops on a line array. The decrease of the evaporation rate caused by the vicinity of sessile drops is reported in terms of a screening coefficient given by a relatively simple analytical expression. The influence of wall wettability on the evaporation of pairs of sessile drops is analyzed, and a parameter is proposed to quantify the effect of geometry in a unified way.
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Affiliation(s)
- S Tonini
- Department of Engineering and Applied Sciences, University of Bergamo Viale Marconi 5, 24044 Dalmine, Bergamo, Italy
| | - G E Cossali
- Department of Engineering and Applied Sciences, University of Bergamo Viale Marconi 5, 24044 Dalmine, Bergamo, Italy
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9
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Abbas A, Zhang C, Asad M, Waqas A, Khatoon A, Hussain S, Mir SH. Recent Developments in Artificial Super-Wettable Surfaces Based on Bioinspired Polymeric Materials for Biomedical Applications. Polymers (Basel) 2022; 14:238. [PMID: 35054645 PMCID: PMC8781395 DOI: 10.3390/polym14020238] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 12/29/2021] [Accepted: 01/02/2022] [Indexed: 02/06/2023] Open
Abstract
Inspired by nature, significant research efforts have been made to discover the diverse range of biomaterials for various biomedical applications such as drug development, disease diagnosis, biomedical testing, therapy, etc. Polymers as bioinspired materials with extreme wettable properties, such as superhydrophilic and superhydrophobic surfaces, have received considerable interest in the past due to their multiple applications in anti-fogging, anti-icing, self-cleaning, oil-water separation, biosensing, and effective transportation of water. Apart from the numerous technological applications for extreme wetting and self-cleaning products, recently, super-wettable surfaces based on polymeric materials have also emerged as excellent candidates in studying biological processes. In this review, we systematically illustrate the designing and processing of artificial, super-wettable surfaces by using different polymeric materials for a variety of biomedical applications including tissue engineering, drug/gene delivery, molecular recognition, and diagnosis. Special attention has been paid to applications concerning the identification, control, and analysis of exceedingly small molecular amounts and applications permitting high cell and biomaterial cell screening. Current outlook and future prospects are also provided.
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Affiliation(s)
- Ansar Abbas
- School of Chemistry, Xi’an Jiaotong University, Xi’an 710049, China; (A.A.); (C.Z.)
| | - Chen Zhang
- School of Chemistry, Xi’an Jiaotong University, Xi’an 710049, China; (A.A.); (C.Z.)
| | - Muhammad Asad
- Green Catalysis Center, College of Chemistry, Zhengzhou University, Zhengzhou 450001, China;
| | - Ahsan Waqas
- Key Laboratory of Applied Surface and Colloid Chemistry (Ministry of Education), School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi’an 710119, China;
| | - Asma Khatoon
- College of Business Administration, Imam Abdulrahman Bin Faisal University, Dammam 34212, Saudi Arabia;
| | - Sameer Hussain
- School of Chemistry, Xi’an Jiaotong University, Xi’an 710049, China; (A.A.); (C.Z.)
| | - Sajjad Husain Mir
- School of Chemistry and Advanced Materials & BioEngineering Research (AMBER) Center, Trinity College Dublin, The University of Dublin, D02 PN40 Dublin, Ireland
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10
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Liu C, Huang J, Guo Z, Liu W. An integrated mesh with anisotropic surface for unidirectional liquid manipulation. Chem Commun (Camb) 2022; 58:9544-9547. [DOI: 10.1039/d2cc02957j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here, we adopted a simple method to prepare the integrated mesh with anisotropic surface (IMAS). The motion mode of the droplet can be switched by changing the tilt angle of...
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11
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Park JH, Shin BS, Jabbarzadeh A. Anisotropic Wettability on One-Dimensional Nanopatterned Surfaces: The Effects of Intrinsic Surface Wettability and Morphology. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:14186-14194. [PMID: 34807615 DOI: 10.1021/acs.langmuir.1c02634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Large-scale molecular dynamic simulations were conducted to study anisotropic wettability on one-dimensional (1D) nanopatterned surfaces. Hexadecane (C16H34) and decane (C10H22) nanodroplets were used as wetting liquids. Initially, surfaces with various intrinsic wettability (oleophobic and oleophilic) were produced using surface lattice size as a control parameter. These surfaces were subsequently patterned with 1D grooves of different sizes, and their anisotropic wettability was examined. The results show that anisotropic wettability strongly depends on intrinsic surface wettability and surface morphology. The results also demonstrate that the anisotropy in the contact angle is negligible for oleophobic surfaces. However, the anisotropy becomes more evident for oleophilic surfaces and increases with the degree of oleophilicity. Results suggest that anisotropy also depends on the surface morphology, including the patterns' width and height. Monitoring the droplet shape showed that more significant droplet distortion was associated with higher anisotropy. A clear association was lacking between the roughness ratio, r, and the degree of anisotropy. The observed average contact angle for 1D patterned oleophilic surfaces disagreed with the predicted values from the Wenzel theory. However, the theory could correctly predict the state of the droplet being Cassie-Baxter or Wenzel.
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Affiliation(s)
- Jun Han Park
- Department of Cogno-Mechatronics Engineering, Pusan National University, Busan 609-735, Korea
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
| | - Bo Sung Shin
- Department of Optics & Mechatronics Engineering, Pusan National University, Busan 609-735 Korea
| | - Ahmad Jabbarzadeh
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
- Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
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12
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Gao Y, Liu Y, Jiang J, Zhu C, Zuhlke C, Alexander D, Francisco JS, Zeng XC. Multiple Wetting-Dewetting States of a Water Droplet on Dual-Scale Hierarchical Structured Surfaces. JACS AU 2021; 1:955-966. [PMID: 34467342 PMCID: PMC8395622 DOI: 10.1021/jacsau.1c00183] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Indexed: 06/12/2023]
Abstract
Surfaces with microscale roughness can entail dual-scale hierarchical structures such as the recently reported nano/microstructured surfaces produced in the laboratory (Wang et al. Nature2020, 582, 55-57). However, how the dual-scale hierarchical structured surface affects the apparent wetting/dewetting states of a water droplet, and the transitions between the states are still largely unexplored. Here, we report a systematic large-scale molecular dynamics (MD) simulation study on the wetting/dewetting states of water droplets on various dual-scale nano/near-submicrometer structured surfaces. To this end, we devise slab-water/slab-substrate model systems with a variety of dual-scale surface structures and with different degrees of intrinsic wettability (as measured based on the counterpart smooth surface). The dual-scale hierarchical structure can be described as "nanotexture-on-near-submicrometer-hill". Depending on three prototypical nanotextures, our MD simulations reveal five possible wetting/dewetting states for a water droplet: (i) Cassie state; (ii) infiltrated upper-valley state; (iii) immersed nanotexture-on-hill state; (iv) infiltrated valley state; and (v) Wenzel state. The transitions between these wetting/dewetting states are strongly dependent on the intrinsic wettability (E in), the initial location of the water droplet, the height of the nanotextures (H 1), and the spacing between nanotextures (W 1). Notably, E in-H 1 and E in-W 1 diagrams show that regions of rich wetting/dewetting states can be identified, including regions where between one to five states can coexist.
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Affiliation(s)
- Yurui Gao
- Department
of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588, United States
- Laboratory
of Theoretical and Computational Nanoscience, National Center for Nanoscience and Technology, Chinese Academy of
Sciences, Beijing 100190, P. R. China
| | - Yuan Liu
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
| | - Jian Jiang
- Department
of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588, United States
| | - Chongqin Zhu
- College
of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry
of Ministry of Education, Beijing Normal
University, Beijing 100875, P. R. China
- Department
of Earth and Environmental Science, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Craig Zuhlke
- Department
of Electrical and Computer Engineering, University of Nebraska—Lincoln, Lincoln, Nebraska 68588, United States
| | - Dennis Alexander
- Department
of Electrical and Computer Engineering, University of Nebraska—Lincoln, Lincoln, Nebraska 68588, United States
| | - Joseph S. Francisco
- Department
of Earth and Environmental Science, Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
| | - Xiao Cheng Zeng
- Department
of Chemistry, University of Nebraska—Lincoln, Lincoln, Nebraska 68588, United States
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13
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Bayat A, Ebrahimi M, Ardekani SR, Iranizad ES, Moshfegh AZ. Extended Gibbs Free Energy and Laplace Pressure of Ordered Hexagonal Close-Packed Spherical Particles: A Wettability Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8382-8392. [PMID: 34240875 DOI: 10.1021/acs.langmuir.1c00343] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The wetting property of spherical particles in a hexagonal close-packed (HCP) ordering from extended Gibbs free energy (GFE) and Laplace pressure view points is studied. A formalism is proposed to predict the contact angle (θ) of a droplet on the HCP films and penetration angle (α) of the liquid on the spherical particles. Then, the extended Laplace pressure for the layered HCP ordering is calculated and a correlation between the wetting angle, sign of pressure, and pressure gradient is achieved. Our results show that the sign and the slope of pressure are important criteria for determining the wettability state and it is found that the contact angle is independent of the particle radius, as supported by various experimental reports. The pressure gradient for the HCP films with Young contact angle higher than (lower than) a critical contact angle, 135° (45°), is positive (negative), indicating the superhydrophobicity (superhydrophilicity) state of the surface. To validate the proposed formulation, theoretical calculations are compared with the reported experimental measurements, showing a good agreement.
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Affiliation(s)
- Amir Bayat
- Department of Basic Science, Tarbiat Modares University, P.O. Box 14115-111, Tehran, Iran
| | - Mahdi Ebrahimi
- Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran
| | - Saeed Rahemi Ardekani
- Department of Engineering, Tarbiat Modares University, P.O. Box 14115-111, Tehran, Iran
| | | | - Alireza Zaker Moshfegh
- Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran
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14
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Ma MC, Song JW, Fan LW. Evaporation Kinetics of Sessile Water Droplets on a Smooth Stainless Steel Surface at Elevated Temperatures and Pressures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:4200-4212. [PMID: 33793252 DOI: 10.1021/acs.langmuir.1c00094] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The evaporation of water droplets on a solid surface at elevated temperatures under a pressurized condition has not yet been well understood, although this phenomenon is of both theoretical and practical significance. In this work, water droplet evaporation on smooth stainless steel surfaces in nitrogen gas atmosphere at elevated pressures and temperatures (up to 2 MPa and 202.4 °C, respectively) was investigated experimentally. It was observed that the increase in pressure diminishes the proportion of the constant contact radius stage over the entire evaporation time, whereas an opposite trend was found when raising the temperature, due to the change in the surface pinning ability with pressure (and temperature). The results also suggested that the evaporation mode transition is mainly affected by temperature rather than pressure. In addition, the evaporation rate was calculated under various degrees of subcooling, revealing that the evaporation rate increases almost linearly with pressure when keeping the degree of subcooling constant. However, when fixing the test temperature, a nonlinear decrease of the evaporation rate with pressure was observed. A power law growth of the evaporation rate with temperature was also found at a constant pressure. Last, it was uncovered by a theoretical analysis that the saturated vapor concentration is the dominant factor dictating the evaporation rate.
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Affiliation(s)
- Meng-Chen Ma
- Institute of Thermal Science and Power Systems, School of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of China
| | - Jia-Wen Song
- Institute of Thermal Science and Power Systems, School of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of China
| | - Li-Wu Fan
- Institute of Thermal Science and Power Systems, School of Energy Engineering, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of China
- State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of China
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15
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Yan J, Cao L, Wang L, Xie C, Liu Y, Song Z, Xu H, Weng Z, Wang Z, Li L. Response of bEnd.3 cells to growing behavior on the graphene oxide film with 2-D grating structure by two-beam laser interference. APPLIED NANOSCIENCE 2021. [DOI: 10.1007/s13204-021-01701-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Inanlu MJ, Shojaan B, Farhadi J, Bazargan V. Effect of Particle Concentration on Surfactant-Induced Alteration of the Contact Line Deposition in Evaporating Sessile Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:2658-2666. [PMID: 33522826 DOI: 10.1021/acs.langmuir.0c03313] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Controlling and suppressing the so-called "coffee-ring effect" (CRE) is an issue of cardinal importance and intense interest in many industries and scientific fields. Here, the combined effect of the particle and surfactant concentration on the CRE is investigated by gradually adding Triton X-100 surfactant to colloidal suspensions of SiO2 nanoparticles in ethanol for various particle concentrations. First, the effect of particle concentration on the contact line dynamics during the evaporation of a sessile droplet is investigated. It is shown that increasing the particle concentration leads to an increase in pinning time and ring width, whereas the droplet's initial and dynamic contact angle remains unchanged. Afterward, the effect of different concentrations of surfactant is studied for different particle concentrations. It is concluded that the surfactant concentration at which the CRE is suppressed is dependent on the initial particle concentration of the colloid, and it increases as the particle concentration increases. Furthermore, as adding surfactant with a concentration lower than this critical concentration results in an unsuppressed CRE, it is shown that surpassing this concentration will result in a depletion of particles in the contact line. Moreover, it is demonstrated that this critical surfactant concentration has no significant effect on the droplet's geometry and the total evaporation time.
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Affiliation(s)
- Mohammad J Inanlu
- School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Behrooz Shojaan
- School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Jafar Farhadi
- School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Vahid Bazargan
- School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran
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17
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Ding W, Han D, Zhang J, Ma Q, Li X, Zhang J, Wang X. Molecular dynamics study of anisotropic behaviours of water droplet on textured surfaces with various energies. Mol Phys 2021. [DOI: 10.1080/00268976.2020.1785028] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Wenyang Ding
- Institute of Thermal Science and Technology, Shandong University, Jinan, People’s Republic of China
| | - Dan Han
- Institute of Thermal Science and Technology, Shandong University, Jinan, People’s Republic of China
| | - Jingzhi Zhang
- School of Energy and Power Engineering, Shandong University, Jinan, People’s Republic of China
| | - Qingming Ma
- Department of Pharmaceutics, School of Pharmacy, Qingdao University, Qingdao, People’s Republic of China
| | - Xiaoyan Li
- Shandong Provincial Key Laboratory of Oral Tissue Regeneration, School of Stomatology, Shandong University, Jinan, People’s Republic of China
| | - Jingchao Zhang
- Holland Computing Center, University of Nebraska-Lincoln, Lincoln, NE, USA
| | - Xinyu Wang
- Institute of Thermal Science and Technology, Shandong University, Jinan, People’s Republic of China
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18
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19
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Kim D, Jeong M, Kang K, Ryu S. Gravitational Effect on the Advancing and Receding Angles of a Two-Dimensional Cassie-Baxter Droplet on a Textured Surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:6061-6069. [PMID: 32370510 DOI: 10.1021/acs.langmuir.9b03939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Advancing and receding angles are physical quantities frequently measured to characterize the wetting properties of a rough surface. Thermodynamically, the advancing and receding angles are often interpreted as the maximum and minimum contact angles that can be formed by a droplet without losing its stability. Despite intensive research on wetting of rough surfaces, the gravitational effect on these angles has been overlooked because most studies have considered droplets smaller than the capillary length. In this study, however, by combining theoretical and numerical modeling, we show that the shape of a droplet smaller than the capillary length can be substantially modified by gravity under advancing and receding conditions. First, based on the Laplace pressure equation, we predict the shape of a two-dimensional Cassie-Baxter droplet on a textured surface with gravity at each pinning point. Then, the stability of the droplet is tested by examining the interference between the liquid surface and neighboring pillars and analyzing the free energy change upon depinning. Interestingly, it turns out that the apparent contact angles under advancing and receding conditions are not affected by gravity, while the overall shape of a droplet and the position of the pinning point are affected by gravity. In addition, the advancing and receding of the droplet with continuously increasing or decreasing volume are analyzed, and it is shown that the gravitational effect plays a key role in the movement of the droplet tip. Also, the gravitational effect on the degree of the stability of the droplet upon the external effect such as vibration is discussed. Finally, the theoretical predictions were validated against line tension-based front tracking modeling (LTM) that seamlessly captures the attachment and detachment between the liquid surface and the solid substrate. Our findings provide a deeper understanding on the advancing and receding phenomena of a droplet and essential insight into designing devices that utilize the wettability of rough surfaces.
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Affiliation(s)
- Donggyu Kim
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Minsoo Jeong
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Keonwook Kang
- Department of Mechanical Engineering, Yonsei University, Seoul 03722, Republic of Korea
| | - Seunghwa Ryu
- Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
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20
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Zhang Q, He L, Zhang X, Tian D, Jiang L. Switchable Direction of Liquid Transport via an Anisotropic Microarray Surface and Thermal Stimuli. ACS NANO 2020; 14:1436-1444. [PMID: 31868346 DOI: 10.1021/acsnano.9b09137] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Design and construction of special surface microstructures has made many amazing breakthroughs in directional liquid transport. Despite much progress in this field, challenges still remain in on-demand switchable direction transport of liquid in situ and real-time via transforming the arrangement of the surface microstructure and external stimuli. Herein, we demonstrate a strategy to achieve switchable direction transport of liquid via a tunable anisotropic microarray surface, that is, assembling a V-shaped prism microarray (VPM) surface, which can also be intelligently manipulated by thermal stimuli. By transforming the parallel and staggered prism microstructure arrangement of the VPM, switchable direction transport of a liquid can be successfully achieved on the VPM surface. Flow direction switching among unidirectional transport, bidirectional transport, and reverse unidirectional transport is also achieved on the temperature-adaptive VPM surface by thermal stimuli, which can be used for on-demand liquid transport according to the paths of the microfluidic channels. The work provides a way for precise liquid manipulation in desired liquid transport, which may be utilized in nonpower conveying systems, autolubrication, life fluid medical instruments, and other microfluidic devices.
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Affiliation(s)
- Qiuya Zhang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry , Beihang University , Beijing 100191 , P.R. China
| | - Linlin He
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry , Beihang University , Beijing 100191 , P.R. China
| | - Xiaofang Zhang
- School of Mathematics and Physics , University of Science and Technology Beijing , Beijing 100083 , P.R. China
| | - Dongliang Tian
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry , Beihang University , Beijing 100191 , P.R. China
- Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100191 , P.R. China
| | - Lei Jiang
- Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology, School of Chemistry , Beihang University , Beijing 100191 , P.R. China
- Beijing Advanced Innovation Center for Biomedical Engineering , Beihang University , Beijing 100191 , P.R. China
- Technical Institute of Physics and Chemistry , Chinese Academy of Sciences , Beijing 100191 , P.R. China
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21
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Guan C, Lv X, Han Z, Chen C. The wetting characteristics of aluminum droplets on rough surfaces with molecular dynamics simulations. Phys Chem Chem Phys 2020; 22:2361-2371. [PMID: 31934698 DOI: 10.1039/c9cp05672f] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In the present study, the impact of surface roughness on the wettability behavior of Al droplets has been investigated via molecular dynamics (MD) simulations. In this work, amorphous carbon (AC) and graphite substrates with different depths and widths were considered. The results show that the increased width of grooves causes the transition of the wetting state from Cassie to Wenzel. Thermodynamic property analysis results indicate that the solid-liquid adhesion and the work done for the removal of the Al droplet from the solid surface decrease as the roughness increases. However, the adhesion in the Wenzel wetting state is better than that in the Cassie wetting state. Therefore, the contact angle increases with the increased roughness in the Cassie wetting systems, while in the Wenzel wetting systems, the contact angle is less than that in other rough systems. In addition, due to the heterogeneity of the surfaces, the density of Al droplets in the solid-liquid interface is decreased with the increased roughness. The anisotropic spreading of Al liquid can be explained by the MSD curves along the X and Y directions.
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Affiliation(s)
- Chaohong Guan
- School of Metallurgy and Environment, Central South University, No. 932, South Road Lushan, Changsha, Hunan 410083, China.
| | - Xiaojun Lv
- School of Metallurgy and Environment, Central South University, No. 932, South Road Lushan, Changsha, Hunan 410083, China.
| | - Zexun Han
- School of Metallurgy and Environment, Central South University, No. 932, South Road Lushan, Changsha, Hunan 410083, China.
| | - Chang Chen
- School of Metallurgy and Environment, Central South University, No. 932, South Road Lushan, Changsha, Hunan 410083, China.
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22
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Zhao J, Zhu J, Cao R, Wang H, Guo Z, Sang DK, Tang J, Fan D, Li J, Zhang H. Liquefaction of water on the surface of anisotropic two-dimensional atomic layered black phosphorus. Nat Commun 2019; 10:4062. [PMID: 31492855 PMCID: PMC6731341 DOI: 10.1038/s41467-019-11937-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 08/13/2019] [Indexed: 12/30/2022] Open
Abstract
The growth and wetting of water on two-dimensional(2D) materials are important to understand the development of 2D material based electronic, optoelectronic, and nanomechanical devices. Here, we visualize the liquefaction processes of water on the surface of graphene, MoS2 and black phosphorus (BP) via optical microscopy. We show that the shape of the water droplets forming on the surface of BP, which is anisotropic, is elliptical. In contrast, droplets are rounded when they form on the surface of graphene or MoS2, which do not possess orthometric anisotropy. Molecular simulations show that the anisotropic liquefaction process of water on the surface of BP is attributed to the different binding energies of H2O molecules on BP along the armchair and zigzag directions. The results not only reveal the anisotropic nature of water liquefaction on the BP surface but also provide a way for fast and nondestructive determination of the crystalline orientation of BP.
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Grants
- National Natural Science Fund (Grant Nos. 61605131, 61435010, and 51778369), Guangdong Science Foundation for Distinguished Young Scholars (2018B030306038), Science and Technology Innovation Commission of Shenzhen (Grant Nos. JCYJ20180507182047316, KQJSCX2018032809550179, KQTD2015032416270385, JCYJ20150625103619275 and ZDSYS201707271014468), Educational Commission of Guangdong Province (2016KCXTD006) and the Science and Technology Development Fund (Grant No. 007/2017/A1), Macao SAR, China.
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Affiliation(s)
- Jinlai Zhao
- Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, 999078, PR China
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China
- College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen, 518060, PR China
| | - Jiajie Zhu
- College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen, 518060, PR China
| | - Rui Cao
- Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, 999078, PR China
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China
| | - Huide Wang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China
| | - Zhinan Guo
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China.
| | - David K Sang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China
| | - Jiaoning Tang
- College of Materials Science and Engineering, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, Shenzhen, 518060, PR China
| | - Dianyuan Fan
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China
| | - Jianqing Li
- Faculty of Information Technology, Macau University of Science and Technology, Avenida Wai Long, Taipa, Macau, 999078, PR China
| | - Han Zhang
- Shenzhen Engineering Laboratory of Phosphorene and Optoelectronics, International Collaborative Laboratory of 2D Materials for Optoelectronics Science and Technology, Engineering Technology Research Center for 2D Material Information Function Devices and Systems of Guangdong Province, Institute of Microscale Optoelectronics (IMO), Shenzhen University, Shenzhen, 518060, PR China.
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23
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Horváth B, Křivová B, Schift H. Nanoimprint meets microfluidics: Development of metal wires from nanoparticle ink filled capillaries. MICRO AND NANO ENGINEERING 2019. [DOI: 10.1016/j.mne.2019.02.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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24
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Lee J, You EA, Hwang DW, Kang S, Wi JS. Active Accumulation of Spherical Analytes on Plasmonic Hot Spots of Double-Bent Au Strip Arrays by Multiple Dip-Coating. NANOMATERIALS 2019; 9:nano9050660. [PMID: 31027370 PMCID: PMC6567194 DOI: 10.3390/nano9050660] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 04/19/2019] [Accepted: 04/24/2019] [Indexed: 12/15/2022]
Abstract
To achieve sensitive plasmonic biosensors, it is essential to develop an efficient method for concentrating analytes in hot spots, as well as to develop plasmonic nanostructures for concentrating light. In this study, target analytes were delivered to the surface of double-bent Au strip arrays by a multiple dip-coating method; they were self-aligned in the valleys between neighboring Au strips by capillary forces. As the valleys not only accommodate target analytes but also host strong electromagnetic fields due to the interaction between adjacent strips, sensitive measurement of target analytes was possible by monitoring changes in the wavelength of a localized surface plasmon resonance. Using the proposed plasmonic sensor and target delivery method, the adsorption and saturation of polystyrene beads 100 nm in size on the sensor surface were monitored by the shift of the resonance wavelength. In addition, the pH-dependent stability of exosomes accumulated on the sensor surface was successfully monitored by changing the pH from 7.4 to 4.0.
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Affiliation(s)
- Jinhyung Lee
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science, Daejeon 34113, Korea.
- School of Mechanical Engineering, Yonsei University, Seoul 03722, Korea.
| | - Eun-Ah You
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science, Daejeon 34113, Korea.
| | - Do Won Hwang
- Department of Nuclear Medicine, Seoul National University Hospital, Seoul 03080, Korea.
| | - Shinill Kang
- School of Mechanical Engineering, Yonsei University, Seoul 03722, Korea.
| | - Jung-Sub Wi
- Center for Nano-Bio Measurement, Korea Research Institute of Standards and Science, Daejeon 34113, Korea.
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25
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Faria-Briceno JJ, Neumann A, Schunk PR, Brueck SRJ. Measuring Liquid Drop Properties on Nanoscale 1D Patterned Photoresist Structures. Sci Rep 2019; 9:5723. [PMID: 30952908 PMCID: PMC6450940 DOI: 10.1038/s41598-019-42106-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 03/24/2019] [Indexed: 11/25/2022] Open
Abstract
This communication reports liquid wetting properties of DI-water on one-dimensional nano-patterned photoresist lines atop a silicon substrate as the pattern period is varied from 0.3- to 1.0-µm. Both constant photoresist height and constant width/height ratios are investigated. The line/period ratio was fixed at 0.3 (0.4) for different measurement sequences. The surface of the photoresist was treated with a short CHF3 reactive ion etch to ensure consistent hydrophobic photoresist: water surface energies. Average parallel contact angle (θ||), average perpendicular contact angle (θ⊥), drop width (W), and drop length (L) at constant volume were measured on nano-patterned surfaces fabricated with interferometric lithography. Both θ|| and θ⊥ contact angles increase as the period (0.3- to 1-μm) increases; the θ|| spreading rate is faster than θ⊥ due to pinning on the grooves resulting in an elongated drop shape. The traditional Wenzel and Cassie-Baxter models of drop contact angles were developed for isotropic random 2D roughness and do not account for the anisotropy induced by the 1D line patterns. The observed angular variations with period are not consistent with either model. Understanding liquid wetting properties and hydrophobicity on 1D silicon surfaces has many applications in lab-on-a-chip, micro/nano-fluidic devices, roll-to-roll nano-imprint fabrication, self-cleaning surfaces, and micro-reactors.
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Affiliation(s)
- Juan J Faria-Briceno
- Center for high Technology and Materials and Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, 1313 Goddard St. SE, Albuquerque, New Mexico, 87106, USA.
| | - Alexander Neumann
- Center for high Technology and Materials and Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, 1313 Goddard St. SE, Albuquerque, New Mexico, 87106, USA
| | - P Randall Schunk
- Department of Chemical and Biochemical Engineering, University of New Mexico, Albuquerque, NM, 87131, USA
- Advanced Materials Laboratory, Sandia National Laboratories, Albuquerque, NM, 87106, USA
| | - S R J Brueck
- Center for high Technology and Materials and Department of Electrical and Computer Engineering, University of New Mexico, Albuquerque, 1313 Goddard St. SE, Albuquerque, New Mexico, 87106, USA
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26
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Wang Y, Jian M, Liu H, Zhang X. Anisotropic Wetting of Droplets on Stripe-Patterned Chemically Heterogeneous Surfaces: Effect of Length Ratio and Deposition Position. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:4387-4396. [PMID: 30346184 DOI: 10.1021/acs.langmuir.8b02491] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The equilibrium state of a droplet deposited on chemically heterogeneous surfaces is studied by using many-body dissipative particle dynamics. The length ratio covers 2 orders from 0.01 to 1 and allows a systematical inspection of the changes of the droplet shape, contact angle, and aspect ratio with this parameter. Moreover, a new parameter, global aspect ratio, is introduced to better characterize the distortion of the droplet. It is found that the droplet shape at the equilibrium stage strongly lies on the deposition position when the length ratio is beyond 0.1. Additionally, the lateral displacement is observed when depositing the droplet on the border of two stripes at large length ratios (over 0.1). On the other hand, the Cassie area fraction also has a significant effect on the wetting behaviors. When the droplet is driven by a body force with a 45° inclined angle to the stripes, the moving direction could be strictly in line with the force direction, deviating from the force direction, or totally in line with the stripes, depending on the length ratio.
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Affiliation(s)
- Yuxiang Wang
- Department of Chemical Engineering , Monash University , Clayton, Melbourne , Victoria 3800 , Australia
| | - Meipeng Jian
- Department of Chemical Engineering , Monash University , Clayton, Melbourne , Victoria 3800 , Australia
| | - Huiyuan Liu
- Department of Chemical Engineering , Monash University , Clayton, Melbourne , Victoria 3800 , Australia
| | - Xiwang Zhang
- Department of Chemical Engineering , Monash University , Clayton, Melbourne , Victoria 3800 , Australia
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27
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Fernández-Toledano JC, Blake T, De Coninck J. Contact-line fluctuations and dynamic wetting. J Colloid Interface Sci 2019; 540:322-329. [DOI: 10.1016/j.jcis.2019.01.041] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 01/09/2019] [Accepted: 01/10/2019] [Indexed: 11/26/2022]
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28
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Tie L, Li J, Guo Z, Liang Y, Liu W. Anisotropic wetting properties of trapezoidal profile surfaces with hierarchical stripes. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2018.11.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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29
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Semprebon C, Herrmann C, Liu BY, Seemann R, Brinkmann M. Shape Evolution of Droplets Growing on Linear Microgrooves. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:10498-10511. [PMID: 30088772 DOI: 10.1021/acs.langmuir.8b01712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Anisotropic spreading of liquids and elongated droplet shapes are often encountered on surfaces decorated with a periodic micropattern of linear surface topographies. Numerical calculations and wetting experiments show that the shape evolution of droplets that are slowly growing on a surface with parallel grooves can be grouped into two distinct morphological regimes. In the first regime, the liquid of the growing droplet spreads only into the direction parallel to the grooves. In the second regime, the three-phase contact line advances also perpendicular to the grooves, whereas the growing droplets approach a scale-invariant shape. Here, we demonstrate that shapes of droplets in contact with a large number of linear grooves are identical to the shapes of droplets confined to a plane chemical stripe, where this mapping of shapes is solely based on the knowledge of the cross section of the linear grooves and the material contact angle. The spectrum of interfacial shapes on the chemical stripe can be exploited to predict the particular growth mode and the asymptotic value of the base eccentricity in the limit of droplets covering a large number of grooves. The proposed model shows an excellent agreement with experimentally observed base eccentricities for droplets on grooves of various cross sections. The universality of the model is underlined by the accurate match with available literature data for droplet eccentricities on parallel chemical stripes.
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Affiliation(s)
- Ciro Semprebon
- Max-Planck Institute for Dynamics and Self-Organization , 37077 Göttingen , Germany
- Smart Materials & Surfaces Laboratory, Department of Mathematics, Physics and Electrical Engineering , Northumbria University , Newcastle NE7 7XA , U.K
| | - Carsten Herrmann
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| | - Bang-Yan Liu
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| | - Ralf Seemann
- Max-Planck Institute for Dynamics and Self-Organization , 37077 Göttingen , Germany
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
| | - Martin Brinkmann
- Max-Planck Institute for Dynamics and Self-Organization , 37077 Göttingen , Germany
- Experimental Physics , Saarland University , 66123 Saarbrücken , Germany
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30
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A three-dimensional model for analyzing the anisotropic wetting behavior of striped surfaces. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.05.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Kwon D, Wooh S, Yoon H, Char K. Mechanoresponsive Tuning of Anisotropic Wetting on Hierarchically Structured Patterns. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4732-4738. [PMID: 29595266 DOI: 10.1021/acs.langmuir.8b00496] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Here, we propose a simple mechanoresponsive system on patterned soft surfaces to manipulate both anisotropy and orientation of liquid wetting. On the poly(dimethylsiloxane) embedding line patterned structures, additional topographies, such as wrinkles and cracks, can be provided by applying compressive and tensile stress, respectively. This tunable hierarchy of structures with the different scales and directions of lines, wrinkles, and cracks allow the mechanoresponsive control of anisotropic wetting in a single platform. In addition, the wetting behavior on those surfaces is precisely investigated based on the concept of critical contact angle to overcome the ridges in a step flow.
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Affiliation(s)
| | - Sanghyuk Wooh
- School of Chemical Engineering & Materials Science , Chung-Ang University , Seoul 06974 , Republic of Korea
| | - Hyunsik Yoon
- Department of Chemical and Biomolecular Engineering , Seoul National University of Science & Technology , Seoul 01811 , Republic of Korea
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32
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Lin G, Zhang Q, Lv C, Tang Y, Yin J. Small degree of anisotropic wetting on self-similar hierarchical wrinkled surfaces. SOFT MATTER 2018; 14:1517-1529. [PMID: 29345710 DOI: 10.1039/c7sm02208e] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We studied the wetting behavior of multiscale self-similar hierarchical wrinkled surfaces. The hierarchical surface was fabricated on poly(dimethylsiloxane) (PDMS) substrates by manipulating the sequential strain release and combined plasma/ultraviolet ozone (UVO) treatment. The generated structured surface shows an independently controlled dual-scale roughness with level-1 small-wavelength wrinkles (wavelength of 700-1500 nm and amplitude of 50-500 nm) resting on level-2 large-wavelength wrinkles (wavelength of 15-35 μm and amplitude of 3.5-5 μm), as well as accompanying orthogonal cracks. By tuning the aspect ratio of hierarchical wrinkles, the degree of wetting anisotropy in hierarchical wrinkled surfaces, defined as the contact angle difference between the parallel and perpendicular directions to the wrinkle grooves, is found to change between 3° and 9°. Through both experimental characterization (confocal fluorescence imaging) and theoretical analyses, we showed that the wetting state in the hierarchical wrinkled surface is in the Wenzel wetting state. We found that the measured apparent contact angle is larger than the theoretically predicted Wenzel contact angle, which is found to be attributed to the three-phase contact line pinning effect of both wrinkles and cracks that generates energetic barriers during the contact line motion. This is evidenced by the observed sudden drop of over 20° in the static contact angles along both perpendicular and parallel directions after slight vibration perturbation. Finally, we concluded that the observed small degree of wetting anisotropy in the hierarchical wrinkled surfaces mainly arises from the competition between orthogonal wrinkles and cracks in the contact line pinning.
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Affiliation(s)
- Gaojian Lin
- Applied Mechanics of Materials Laboratory, Department of Mechanical Engineering, Temple University, 1947 North 12th Street, Philadelphia, PA 19122, USA.
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Zhan Y, Ruan M, Li W, Li H, Hu L, Ma F, Yu Z, Feng W. Fabrication of anisotropic PTFE superhydrophobic surfaces using laser microprocessing and their self-cleaning and anti-icing behavior. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.09.018] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gürsoy M, Harris M, Carletto A, Yaprak A, Karaman M, Badyal J. Bioinspired asymmetric-anisotropic (directional) fog harvesting based on the arid climate plant Eremopyrum orientale. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.06.065] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ge P, Wang S, Liu Y, Liu W, Yu N, Zhang J, Shen H, Zhang J, Yang B. Autonomous Control of Fluids in a Wide Surface Tension Range in Microfluidics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7248-7255. [PMID: 28681601 DOI: 10.1021/acs.langmuir.7b01934] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this paper, we report the preparation of anisotropic wetting surfaces that could control various wetting behaviors of liquids in a wide surface tension range (from water to oil), which could be employed as a platform for controlling the flow of liquids in microfluidics (MFs). The anisotropic wetting surfaces are chemistry-asymmetric "Janus" silicon cylinder arrays, which are fabricated via selecting and regulating the functional groups on the surface of each cylinder unit. Liquids (in a wide surface tension range) wet in a unidirectional manner along the direction that was modified by the group with large surface energy. Through introducing the Janus structure into a T-shaped pattern and integrating it with an identical T-shaped poly(dimethylsiloxane) microchannel, the as-prepared chips can be utilized to perform as a surface tension admeasuring apparatus or a one-way valve for liquids in a wide surface tension range, even oil. Furthermore, because of the excellent ability in controlling the flowing behavior of liquids in a wide surface tension range in an open system or a microchannel, the anisotropic wetting surfaces are potential candidates to be applied both in open MFs and conventional MFs, which would broaden the application fields of MFs.
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Affiliation(s)
- Peng Ge
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Shuli Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Yongshun Liu
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences , Changchun 130033, P. R. China
| | - Wendong Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Nianzuo Yu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Jianglei Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Huaizhong Shen
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Junhu Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
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Azad MAK, Krause T, Danter L, Baars A, Koch K, Barthlott W. Fog Collection on Polyethylene Terephthalate (PET) Fibers: Influence of Cross Section and Surface Structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5555-5564. [PMID: 28260383 DOI: 10.1021/acs.langmuir.7b00478] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Fog-collecting meshes show a great potential in ensuring the availability of a supply of sustainable freshwater in certain arid regions. In most cases, the meshes are made of hydrophilic smooth fibers. Based on the study of plant surfaces, we analyzed the fog collection using various polyethylene terephthalate (PET) fibers with different cross sections and surface structures with the aim of developing optimized biomimetic fog collectors. Water droplet movement and the onset of dripping from fiber samples were compared. Fibers with round, oval, and rectangular cross sections with round edges showed higher fog-collection performance than those with other cross sections. However, other parameters, for example, width, surface structure, wettability, and so forth, also influenced the performance. The directional delivery of the collected fog droplets by wavy/v-shaped microgrooves on the surface of the fibers enhances the formation of a water film and their fog collection. A numerical simulation of the water droplet spreading behavior strongly supports these findings. Therefore, our study suggests the use of fibers with a round cross section, a microgrooved surface, and an optimized width for an efficient fog collection.
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Affiliation(s)
- M A K Azad
- Nees Institute for Biodiversity of Plants, Rheinische Friedrich-Wilhelms-University , 53115 Bonn, Germany
| | - Tobias Krause
- Nees Institute for Biodiversity of Plants, Rheinische Friedrich-Wilhelms-University , 53115 Bonn, Germany
- Department of Mechanical Engineering, Westphalian University of Applied Sciences , 46397 Bocholt, Germany
| | - Leon Danter
- Department of Biomimetics, Faculty of Nature and Technique, Bremen University of Applied Sciences , 28199 Bremen, Germany
| | - Albert Baars
- Department of Biomimetics, Faculty of Nature and Technique, Bremen University of Applied Sciences , 28199 Bremen, Germany
| | - Kerstin Koch
- Faculty of Life Sciences, Rhine-Waal University of Applied Sciences , 47533 Kleve, Germany
| | - Wilhelm Barthlott
- Nees Institute for Biodiversity of Plants, Rheinische Friedrich-Wilhelms-University , 53115 Bonn, Germany
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37
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Interference lithography with functional block copolymer blends: Hierarchical structuration and anisotropic wetting. Eur Polym J 2017. [DOI: 10.1016/j.eurpolymj.2017.03.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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38
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Rhee D, Lee W, Odom TW. Crack‐Free, Soft Wrinkles Enable Switchable Anisotropic Wetting. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701968] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dongjoon Rhee
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
| | - Won‐Kyu Lee
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
| | - Teri W. Odom
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
- Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
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Rhee D, Lee W, Odom TW. Crack‐Free, Soft Wrinkles Enable Switchable Anisotropic Wetting. Angew Chem Int Ed Engl 2017; 56:6523-6527. [DOI: 10.1002/anie.201701968] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 03/23/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Dongjoon Rhee
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
| | - Won‐Kyu Lee
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
| | - Teri W. Odom
- Department of Materials Science and Engineering Northwestern University 2220 Campus Drive Evanston IL 60208 USA
- Department of Chemistry Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
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Ge P, Wang S, Liu W, Wang T, Yu N, Ye S, Shen H, Wu Y, Zhang J, Yang B. Unidirectional Wetting of Liquids on "Janus" Nanostructure Arrays under Various Media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2177-2184. [PMID: 28195733 DOI: 10.1021/acs.langmuir.7b00034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We report the unidirectional wetting behavior of liquids (water and oil) on Janus silicon cylinder arrays (Si-CAs) under various media (air, water, and oil). The Janus cylinders were prepared by chemical modification of nanocylinders with different molecules on two sides. Through adjusting surface energies of the modified molecules, the as-prepared surfaces could control the wetting behavior of different types of liquids under various media. We discuss the regularity systematically and propose a strategy for preparing anisotropic wetting surfaces under arbitrary media. That is, to find two surface modification molecules with different surface energies, one of the molecules is easy to be wetted by the liquid under the corresponding media, while the other one is difficult. Additionally, by introducing thermal-responsive polymer brushes onto one part of Janus Si-CAs, the surfaces show thermal-responsive anisotropic wetting property under various media. We believe that due to the excellent unidirectional wettability under various media, the Janus surfaces could be applied in water/oil transportation, oil-repellent and self-cleaning coatings, water/oil separation, microfluidics, and so on.
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Affiliation(s)
- Peng Ge
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Shuli Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Wendong Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Tieqiang Wang
- Research Center for Molecular Science and Engineering, Northeastern University , Shenyang 110004, P. R. China
| | - Nianzuo Yu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Shunsheng Ye
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Huaizhong Shen
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Yuxin Wu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Junhu Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Changchun 130012, P. R. China
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Zhang P, Chen H, Li L, Liu H, Liu G, Zhang L, Zhang D, Jiang L. Bioinspired Smart Peristome Surface for Temperature-Controlled Unidirectional Water Spreading. ACS APPLIED MATERIALS & INTERFACES 2017; 9:5645-5652. [PMID: 28106363 DOI: 10.1021/acsami.6b15802] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Unidirectional liquid spreading without energy input has attracted considerable attention due to various potential applications such as biofluidics devices and self-lubrication. Introducing a surface wettable gradient or asymmetric nanostructures onto the surface has successfully harnessed the liquid to spread unidirectionally. However, these surfaces are still plagued with problems that restrict their practical applications: fixed spreading state for a fixed surface, and spreading slowly over a short distance. Herein, bioinspired from the fast continuous unidirectional water transport on the peristome of Nepenthes alata, we report a smart peristome with temperature-controlled unidirectional water spreading. The smart artificial peristome was fabricated by grafting the thermoresponsive material PNIPAAm onto the artificial PDMS peristome. Unidirectional water spreading on the smart peristome can be dynamically regulated by changing the surface temperature. Besides, the water spreading is demonstrated with a remarkable reversibility and stability. By investigating the relationship between liquid spreading distance and wettability, the underlying mechanism was revealed. This work gives a new way to achieve the control of unidirectional liquid spreading available for controllable microfluidics and medical devices.
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Affiliation(s)
- Pengfei Zhang
- School of Mechanical Engineering and Automation, Beihang University , Beijing 100191, China
| | - Huawei Chen
- School of Mechanical Engineering and Automation, Beihang University , Beijing 100191, China
| | - Li Li
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Hongliang Liu
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Guang Liu
- School of Mechanical Engineering and Automation, Beihang University , Beijing 100191, China
| | - Liwen Zhang
- School of Mechanical Engineering and Automation, Beihang University , Beijing 100191, China
| | - Deyuan Zhang
- School of Mechanical Engineering and Automation, Beihang University , Beijing 100191, China
| | - Lei Jiang
- CAS Key Laboratory of Bio-inspired Materials and Interfacial Science, CAS Center for Excellence in Nanoscience, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences , Beijing 100190, China
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42
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Thormann E. Surface forces between rough and topographically structured interfaces. Curr Opin Colloid Interface Sci 2017. [DOI: 10.1016/j.cocis.2016.09.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Yu N, Wang S, Liu Y, Xue P, Ge P, Nan J, Ye S, Liu W, Zhang J, Yang B. Thermal-Responsive Anisotropic Wetting Microstructures for Manipulation of Fluids in Microfluidics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:494-502. [PMID: 27998059 DOI: 10.1021/acs.langmuir.6b03896] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We show morphology-patterned stripes modified by thermal-responsive polymer for smartly guiding flow motion of fluid in chips. With a two-step modification process, we fabricated PNIPAAm-modified Si stripes on silicon slides, which were employed as substrates for fluid manipulation in microchannels. When the system temperature switches between above and below the lower critical solution temperature (LCST) of PNIPAAm, the wettability of the substrates also switches between strong anisotropy and weak anisotropy, which resulted in anisotropic (even unidirectional) flow and isotropic flow behavior of liquid in microchannels. The thermal-responsive flow motion of fluid in the chip is influenced by the applied pressure, the thickness of PNIPAAm, and dimension of the microchannels. Moreover, we measured the feasible applied pressure scopes under different structure factors. Because of the excellent reversibility and quick switching speed, the chip could be used as a thermal-responsive microvalve. Through tuning the system temperature and adding the assistant gas, we realized successive "valve" function. We believe that the practical and simple chip could be widely utilized in medical detection, immunodetection, protein analysis, and cell cultures.
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Affiliation(s)
- Nianzuo Yu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Shuli Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Yongshun Liu
- State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), Chinese Academy of Sciences , Beijing 130033, P. R. China
| | - Peihong Xue
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Peng Ge
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Jingjie Nan
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Shunsheng Ye
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Wendong Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Junhu Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
| | - Bai Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University , Jilin 130012, P. R. China
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Yunusa M, Ozturk FE, Yildirim A, Tuvshindorj U, Kanik M, Bayindir M. Bio-inspired hierarchically structured polymer fibers for anisotropic non-wetting surfaces. RSC Adv 2017. [DOI: 10.1039/c6ra28111g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A rice leaf-like hierarchically textured polymer fiber arrays for anisotropic non-wetting surfaces.
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Affiliation(s)
- M. Yunusa
- UNAM – National Nanotechnology Research Center
- Turkey
- Institute of Materials Science and Nanotechnology
- Turkey
| | - F. E. Ozturk
- UNAM – National Nanotechnology Research Center
- Turkey
- Institute of Materials Science and Nanotechnology
- Turkey
| | - A. Yildirim
- UNAM – National Nanotechnology Research Center
- Turkey
- Institute of Materials Science and Nanotechnology
- Turkey
| | - U. Tuvshindorj
- UNAM – National Nanotechnology Research Center
- Turkey
- Institute of Materials Science and Nanotechnology
- Turkey
| | - M. Kanik
- UNAM – National Nanotechnology Research Center
- Turkey
- Institute of Materials Science and Nanotechnology
- Turkey
| | - M. Bayindir
- UNAM – National Nanotechnology Research Center
- Turkey
- Institute of Materials Science and Nanotechnology
- Turkey
- Department of Physics
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Wang T, Jiang L, Li X, Hu J, Wang Q, Ye S, Zhang H, Lu Y. Controllable anisotropic wetting characteristics on silicon patterned by slit-based spatial focusing of femtosecond laser. OPTICS EXPRESS 2016; 24:25732-25741. [PMID: 27828508 DOI: 10.1364/oe.24.025732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We propose a promising method to fabricate controllable anisotropic morphologies in which the slit-based spatial focusing of femtosecond laser is used to create an elliptical-shaped intensity distribution at focal plane, inducing elliptical-shaped morphology with micro/nano-dual-scale structures. Our study shows that 1) by increasing slit width, minor axis increases while major axis and axial ratio decrease; 2) with fixed slit width and laser fluence above the threshold, axial ratio is independent of irradiation pulse number; and 3) when polarization direction is changed from 0° to 90°, the axial ratio of anisotropic morphology declines. As a case study, large-area periodic anisotropic hierarchical structures are fabricated with the bidirectional anisotropic wetting.
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47
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Roth SV. A deep look into the spray coating process in real-time-the crucial role of x-rays. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:403003. [PMID: 27537198 DOI: 10.1088/0953-8984/28/40/403003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Tailoring functional thin films and coating by rapid solvent-based processes is the basis for the fabrication of large scale high-end applications in nanotechnology. Due to solvent loss of the solution or dispersion inherent in the installation of functional thin films and multilayers the spraying and drying processes are strongly governed by non-equilibrium kinetics, often passing through transient states, until the final structure is installed. Therefore, the challenge is to observe the structural build-up during these coating processes in a spatially and time-resolved manner on multiple time and length scales, from the nanostructure to macroscopic length scales. During installation, the interaction of solid-fluid interfaces and between the different layers, the flow and evaporation themselves determine the structure of the coating. Advanced x-ray scattering methods open a powerful pathway for observing the involved processes in situ, from the spray to the coating, and allow for gaining deep insight in the nanostructuring processes. This review first provides an overview over these rapidly evolving methods, with main focus on functional coatings, organic photovoltaics and organic electronics. Secondly the role and decisive advantage of x-rays is outlined. Thirdly, focusing on spray deposition as a rapidly emerging method, recent advances in investigations of spray deposition of functional materials and devices via advanced x-ray scattering methods are presented.
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Affiliation(s)
- Stephan V Roth
- Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85, D-22607 Hamburg, Germany. Department of Fibre and Polymer Technology, KTH Royal Institute of Technology, Teknikringen 56-58, SE-100 44 Stockholm, Sweden
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Chen Y, Zhao Z, Karim A, Weiss RA. Shape Memory of Microscale and Nanoscale Imprinted Patterns on a Supramolecular Polymer Compound. Macromol Rapid Commun 2016; 37:1932-1938. [DOI: 10.1002/marc.201600362] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 08/15/2016] [Indexed: 12/19/2022]
Affiliation(s)
- Ying Chen
- Department of Polymer Engineering University of Akron Akron OH 44325 USA
| | - Zhiyang Zhao
- Department of Polymer Engineering University of Akron Akron OH 44325 USA
| | - Alamgir Karim
- Department of Polymer Engineering University of Akron Akron OH 44325 USA
| | - R. A. Weiss
- Department of Polymer Engineering University of Akron Akron OH 44325 USA
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Hiltl S, Böker A. Wetting Phenomena on (Gradient) Wrinkle Substrates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8882-8888. [PMID: 27517879 DOI: 10.1021/acs.langmuir.6b02364] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We characterize the wetting behavior of nanostructured wrinkle and gradient wrinkle substrates. Different contact angles on both sides of a water droplet after deposition on a gradient sample induce the self-propelled motion of the liquid toward smaller wrinkle dimensions. The droplet motion is self-limited by the contact angles balancing out. Because of the correlation between droplet motion and contact angles, we investigate the wetting behavior of wrinkle substrates with constant dimensions (wavelengths of 400-1200 nm). Contact angles of water droplets on those substrates increase with increasing dimensions of the underlying substrate. The results are independent of the two measurement directions, parallel and perpendicular to the longitudinal axis of the nanostructure. The presented findings may be considered for designing microfluidic or related devices and initiate ideas for the development of further wrinkle applications.
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Affiliation(s)
- Stephanie Hiltl
- Fraunhofer-Institut für Angewandte Polymerforschung IAP, D-14476 Potsdam-Golm, Germany
| | - Alexander Böker
- Fraunhofer-Institut für Angewandte Polymerforschung IAP, D-14476 Potsdam-Golm, Germany
- Lehrstuhl für Polymermaterialien und Polymertechnologien, Universität Potsdam , D-14476 Potsdam-Golm, Germany
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50
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Dokowicz M, Nowicki W. Morphological Transitions of Droplets Wetting a Series of Triangular Grooves. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7259-7264. [PMID: 27347695 DOI: 10.1021/acs.langmuir.6b01275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Morphology and thermodynamics of a microdroplet deposited on a grooved inhomogeneous surface with triangular cross section of the grooves were studied by computer simulations with the use of Surface Evolver program. With increasing volume of the droplet, it initially spreads along the series of grooves assuming the filament-like morphology. After reaching a certain volume, the surface wetted by the droplet is reduced and the droplet assumes the bulge morphology or spreads over the surface bordering on the groove initially occupied (it can be either a neighboring groove or a flat surface). The character of the process is determined by the geometry of the edge of the inhomogeneity studied. The effect described also depends on the number of grooves G and the Young contact angle θY. The change in the shape of the droplet becomes more pronounced with decreasing θY and G. Above a certain number of grooves, in the range of contact angles studied (e.g., G > 6 if θY = 70° and G > 4 if θY = 75°), no morphological transition of the droplet was observed.
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Affiliation(s)
- Marcin Dokowicz
- Faculty of Chemistry, Adam Mickiewicz University in Poznań , Umultowska 89b, 61-614 Poznań, Poland
| | - Waldemar Nowicki
- Faculty of Chemistry, Adam Mickiewicz University in Poznań , Umultowska 89b, 61-614 Poznań, Poland
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