1
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Nannette C, Baudry J, Chen A, Song Y, Shglabow A, Bremond N, Démoulin D, Walters J, Weitz DA, Bibette J. Thin adhesive oil films lead to anomalously stable mixtures of water in oil. Science 2024; 384:209-213. [PMID: 38603504 DOI: 10.1126/science.adj6728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2023] [Accepted: 03/06/2024] [Indexed: 04/13/2024]
Abstract
Oil and water can only be mixed by dispersing droplets of one fluid in the other. When two droplets approach one another, the thin film that separates them invariably becomes unstable, causing the droplets to coalesce. The only known way to avoid this instability is through addition of a third component, typically a surfactant, which stabilizes the thin film at its equilibrium thickness. We report the observation that a thin fluid film of oil separating two water droplets can lead to an adhesive interaction between the droplets. Moreover, this interaction prevents their coalescence over timescales of several weeks, without the use of any surfactant or solvent.
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Affiliation(s)
- Claire Nannette
- Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France
- Calyxia, 94380 Bonneuil-sur-Marne, France
| | - Jean Baudry
- Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France
| | - Anqi Chen
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Yiqiao Song
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Athinoula A. Martinos Center for Biomedical Imaging, Department of Radiology, Massachusetts General Hospital, Charlestown, MA 02129, USA
| | - Abdulwahed Shglabow
- Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France
| | - Nicolas Bremond
- Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France
| | | | | | - David A Weitz
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA
- Department of Physics, Harvard University, Cambridge, MA 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA 02215, USA
| | - Jérôme Bibette
- Laboratoire Colloïdes et Matériaux Divisés, CBI, ESPCI Paris, Université PSL, CNRS, 75005 Paris, France
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2
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Hong S, Son G. Numerical investigation of ultrasound focusing and bubble collapse. ULTRASONICS 2023; 135:107133. [PMID: 37598500 DOI: 10.1016/j.ultras.2023.107133] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 07/18/2023] [Accepted: 08/08/2023] [Indexed: 08/22/2023]
Abstract
Ultrasound focusing and microbubble collapse are numerically investigated using a level-set interface tracking method for two-phase flows with multiple interfaces. The computations for ultrasound propagating through a spherical lens demonstrate the ultrasound refraction and pressure intensification at the rear of the lens. The focusing of the initial negative pressure wave through the lens induces a converging flow and the focusing of the subsequent positive pressure wave further intensifies the pressure at the lens. Computations are extended to bubble oscillations near the focusing lens and compared with the no-lens case. The lens not only amplifies the bubble expansion and contraction rates significantly but also generates a larger pressure gradient across the bubble. This ultrasound focusing effect contributes to the asymmetric collapse of the bubble and the formation of a liquid jet that penetrates the bubble. The effects of lens size, initial bubble radius and bubble-lens distance on bubble expansion and liquid jet are further investigated.
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Affiliation(s)
- Seongjin Hong
- Department of Mechanical Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, South Korea
| | - Gihun Son
- Department of Mechanical Engineering, Sogang University, 35 Baekbeom-ro, Mapo-gu, Seoul 04107, South Korea.
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3
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Zhao G, Wu T, Wang R, Li Z, Yang Q, Wang L, Zhou H, Jin B, Liu H, Fang Y, Wang D, Xu F. Hydrogel-assisted microfluidic spinning of stretchable fibers via fluidic and interfacial self-adaptations. SCIENCE ADVANCES 2023; 9:eadj5407. [PMID: 37862410 PMCID: PMC10588953 DOI: 10.1126/sciadv.adj5407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2023] [Accepted: 09/18/2023] [Indexed: 10/22/2023]
Abstract
Stretchable polymeric fibers have enormous potential, but their production requires rigorous environmental controls and considerable resource consumption. It's also challenging for elastic polymers with high performance but poor spinnability, such as silicones like polydimethylsiloxane and Ecoflex. We present a hydrogel-assisted microfluidic spinning (HAMS) method to address these challenges by encapsulating their prepolymers within arbitrarily long, protective, and sacrificable hydrogel fibers. By designing simple apparatuses and manipulating the fluidic and interfacial self-adaptations of oil/water flows, we successfully produce fibers with widely controllable diameter (0.04 to 3.70 millimeters), notable length, high quality (e.g., smooth surface, whole-length uniformity, and rounded section), and remarkable stretchability (up to 1300%) regardless of spinnability. Uniquely, this method allows an easy, effective, and controllable reshaping production of helical fibers with exceptional stretchability and mechanical compliance. We deeply reveal the mechanisms in producing these fibers and demonstrate their potential as textile components, optoelectronic devices, and actuators. The HAMS method would be a powerful tool for mass-producing high-quality stretchable fibers.
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Affiliation(s)
- Guoxu Zhao
- State Key Laboratory of Digital Medical Engineering, Key Laboratory of Biomedical Engineering of Hainan Province, School of Biomedical Engineering, Hainan University, Haikou 570228, P.R. China
| | - Tinglong Wu
- State Key Laboratory of Digital Medical Engineering, Key Laboratory of Biomedical Engineering of Hainan Province, School of Biomedical Engineering, Hainan University, Haikou 570228, P.R. China
| | - Ruhai Wang
- School of Material Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, P.R. China
| | - Zhong Li
- School of Material Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, P.R. China
| | - Qingzhen Yang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P.R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.R. China
| | - Lei Wang
- State Key Laboratory of Digital Medical Engineering, Key Laboratory of Biomedical Engineering of Hainan Province, School of Biomedical Engineering, Hainan University, Haikou 570228, P.R. China
| | - Hongwei Zhou
- School of Material Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, P.R. China
| | - Birui Jin
- School of Material Science and Chemical Engineering, Xi’an Technological University, Xi’an 710021, P.R. China
| | - Hao Liu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P.R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.R. China
| | - Yunsheng Fang
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P.R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.R. China
| | - Dong Wang
- State Key Laboratory of Digital Medical Engineering, Key Laboratory of Biomedical Engineering of Hainan Province, School of Biomedical Engineering, Hainan University, Haikou 570228, P.R. China
| | - Feng Xu
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and Technology, Xi’an Jiaotong University, Xi’an 710049, P.R. China
- Bioinspired Engineering and Biomechanics Center (BEBC), Xi’an Jiaotong University, Xi’an 710049, P.R. China
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4
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Hasegawa M, Oi J, Yamashita K, Seto K, Kobayashi T, Tokunaga E. Observation of Coherent Perfect Absorption in Oil Film on Water Surface and Sensitive Detection of Refractive Index Anisotropy in the Film. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:11357-11362. [PMID: 37528095 PMCID: PMC10433521 DOI: 10.1021/acs.langmuir.3c01189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 07/21/2023] [Indexed: 08/03/2023]
Abstract
Sharp reflection dips of 50% were observed when white light was incident from the side of a cell on a 1 μm thick film of silicone oil (polydimethylsiloxane, PDMS, nearly transparent in visible light, with the extinction coefficient κ ≈ 0.0001) above a water surface in the cell so that the total reflection condition was satisfied at the oil-air interface. This is the first observation of a coherent perfect absorption (CPA) phenomenon in liquid. The experimental results can be reproduced by the Fresnel reflectance of the monolayer film, but the wavelength positions at which the dip appears for s-polarized and p-polarized light are reversed if the refractive index of the oil film is assumed to be isotropic. The experimental results were correctly reproduced by assuming that the extraordinary-ray refractive index (light polarized perpendicular to the interface) is 1% larger than the ordinary-ray refractive index (light polarized parallel to the interface). This indicates that the polarization dependence of the CPA phenomenon is extremely sensitive to the difference between the in-plane and out-of-plane refractive indices of the thin film.
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Affiliation(s)
- Mayu Hasegawa
- Department
of Physics, Faculty of Science, Tokyo University
of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Junpei Oi
- Department
of Physics, Faculty of Science, Tokyo University
of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Kyohei Yamashita
- Department
of Physics, Faculty of Science, Tokyo University
of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Keisuke Seto
- Department
of Physics, Faculty of Science, Tokyo University
of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
| | - Takayoshi Kobayashi
- Advanced
Ultrafast Laser Research Center, The University
of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
- Department
of Electrophysics, National Yang Ming Chiao
Tung University, Hsinchu 300, Taiwan
| | - Eiji Tokunaga
- Department
of Physics, Faculty of Science, Tokyo University
of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
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5
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Spitzer AR, Hutchens SB. Deformation-dependent polydimethylsiloxane permeability measured using osmotic microactuators. SOFT MATTER 2023; 19:6005-6017. [PMID: 37503827 DOI: 10.1039/d2sm01666d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/29/2023]
Abstract
In soft solids, large deformations significantly alter molecular structure and device geometry, which can impact other properties. In the case of mass transport, an interplay between flux and mechanical deformation results. Here we demonstrate a platform for the simultaneous characterization of mechano-permselectivity using the (slow) transport of water through polydimethylsiloxane (PDMS) as a challenging test case. The platform uses micron-sized, cylindrical, NaCl solution-filled PDMS chambers encapsulated by selectively-permeable PDMS thin film membranes. When placed in a high chemical potential environment (high water potential) the osmotic pressure difference between the chamber and environment induces water to flow through the PDMS membrane into the chamber, resulting in membrane bulging. A model combining membrane flux and nonlinear elasticity captures the time-dependent response well, but only when a deformation-dependent permeability is used. Notably, the permeability of water through PDMS decreases by nearly an order of magnitude, from 2 × 10-12 to 5 × 10-13 m2 s-1, due primarily to its thickness decreasing by nearly an order of magnitude as the average biaxial stretch increases from 1 to 2.75.
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Affiliation(s)
- Alexandra R Spitzer
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA
| | - Shelby B Hutchens
- Department of Materials Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA
- Department of Mechanical Science and Engineering, University of Illinois Urbana-Champaign, Urbana, IL, USA.
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6
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Yan J, Xu J, Weng LT, Wang F, Wang X, Yuan H, Wang T, Tsui OKC. Glass Transition of the Surface Monolayer of Polystyrene Films with Different Film Thicknesses and Supporting Surfaces. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c02013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Jinsong Yan
- Department of Physics, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
| | - Jianquan Xu
- Department of Physics, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou310018, China
| | - Lu-Tao Weng
- Materials Characterization and Preparation Facility (GZ), Advanced Materials Thrust, The Hong Kong University of Science and Technology (Guangzhou), Nansha, Guangzhou511400, Guangdong, China
- Department of Chemical and Biological Engineering, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
| | - Fengliang Wang
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou310018, China
| | - Xinping Wang
- Department of Chemistry, Key Laboratory of Surface & Interface Science of Polymer Materials of Zhejiang Province, Zhejiang Sci-Tech University, Hangzhou310018, China
| | - Hailin Yuan
- Department of Physics, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
| | - Tong Wang
- Department of Physics, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
- Department of Materials Science & Engineering, Northwestern University, Evanston, Illinois60208-3120, United States
| | - Ophelia K. C. Tsui
- Department of Physics, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
- William Mong Institute of Nano Science and Technology, Hong Kong University of Science and Technology, Kowloon, 999077Hong Kong, China
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7
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Cambiaso S, Rasera F, Rossi G, Bochicchio D. Development of a transferable coarse-grained model of polydimethylsiloxane. SOFT MATTER 2022; 18:7887-7896. [PMID: 36206016 DOI: 10.1039/d2sm00939k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Polydimethylsiloxane (PDMS) is a popular silicon-based polymer with advanced applications in microfluidics and nanocomposites. The slow dynamics of polymer chains in such complex systems hinders molecular dynamics investigations based on all atom force fields. This limitation can be overcome by exploiting finely tuned coarse-grained (CG) models. This paper develops a transferable CG model of PDMS, compatible with the recent Martini 3 force field, using structural and thermodynamic properties as targets in the parametrization, including a vast set of experimental free energies of transfer. We validate the model transferability by reproducing the correct scaling laws for the PDMS gyration radius in the melt and good and bad solvents. We successfully test the model by reproducing the wetting behavior of water and acetonitrile on PDMS and the phase behavior of a PDMS-peptide triblock copolymer system. This work sets the stage for computational studies involving the interaction between PDMS and many synthetic and biological molecules modeled within the Martini framework.
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Affiliation(s)
- Sonia Cambiaso
- Physics Department, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy.
| | - Fabio Rasera
- Dept of Mechanical and Aerospace Engineering, University of Rome La Sapienza, Via Eudossiana 18, 00184 Rome, Italy
| | - Giulia Rossi
- Physics Department, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy.
| | - Davide Bochicchio
- Physics Department, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy.
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8
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Wu C. Critical Thicknesses of Free-Standing Thin Films of Molten Polymers: A Multiscale Simulation Study. J Phys Chem B 2022; 126:6500-6510. [PMID: 35979674 DOI: 10.1021/acs.jpcb.2c02627] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The free-standing thin films of melted poly(ethylene oxide) have been extensively simulated by the chemically specific coarse-grained (CG) molecular dynamics (MD) method. It is revealed that if the polymer thin film becomes thinner than some critical value, it would initially turn into a fiber, accompanied by an increase in the free surface area and a decrease in surface tension. A simple but efficient scheme is proposed to determine the critical interfacial thickness and the film thickness from the non-intrinsic density and pressure profiles, and the ratio of the two thicknesses is defined as the interfacial fraction. The critical film thickness is found to increase with the number of chains or equivalently the transverse area. With increasing temperature, the critical interfacial thickness increases a bit whereas the critical film thickness slightly decreases, highlighting the important role of the interfacial fraction. For both of the "critical" and "thick" films, the outermost surface layers are confirmed to undergo the greatest movements. The "critical" film exhibits the intrinsic interfacial thickness and bulk density almost identical to those of the "thick" film, dictating the thickness independence of the surface tension. Therefore, the phase stability of the film is essentially determined from the intrinsic thickness of the bulk layer, and the identified temperature dependence of the critical film thickness can be mainly explained by the surface tension.
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Affiliation(s)
- Chaofu Wu
- Hunan Provincial Key Laboratory of Fine Ceramics and Powder Materials, School of Materials and Environmental Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, Hunan, P. R. China
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9
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Rocheron M, Curtil C, Klein HR. FM-AFM with a Hanging Fiber Probe for the Study of Liquid-Liquid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6592-6601. [PMID: 35588164 DOI: 10.1021/acs.langmuir.2c00450] [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
This work describes how a frequency modulation atomic force microscope (AFM) using a hanging fiber force probe made from a quartz tuning fork provides local measurements on liquid-liquid interfaces. After detailing the manufacture and calibration of the force probe, we provide evidence that this AFM is suitable for quantitative measurements at the interface between two liquids. The repeatability of the measurements allows a poly-dimethylsiloxane-water moving interface to be monitored over several hours. The evaporation of a water droplet immersed in poly-dimethylsiloxane is observed, and its interfacial tension evolution over time is measured. Deformation of the interface is also observed. These capabilities, and preliminary results for the interface between two immiscible liquids, pave the way for interface manipulation and study of complex fluid-fluid interfaces.
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Affiliation(s)
| | - Christian Curtil
- Aix Marseille Université, CINAM UMR 7325, F-13009 Marseille, France
| | - Hubert R Klein
- Aix Marseille Université, CINAM UMR 7325, F-13009 Marseille, France
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10
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Fortune GT, Oliveira NM, Goldstein RE. Biofilm Growth under Elastic Confinement. PHYSICAL REVIEW LETTERS 2022; 128:178102. [PMID: 35570462 DOI: 10.1103/physrevlett.128.178102] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 04/06/2022] [Indexed: 06/15/2023]
Abstract
Bacteria often form surface-bound communities, embedded in a self-produced extracellular matrix, called biofilms. Quantitative studies of bioflim growth have typically focused on unconfined expansion above solid or semisolid surfaces, leading to exponential radial growth. This geometry does not accurately reflect the natural or biomedical contexts in which biofilms grow in confined spaces. Here, we consider one of the simplest confined geometries: a biofilm growing laterally in the space between a solid surface and an overlying elastic sheet. A poroelastic framework is utilized to derive the radial growth rate of the biofilm; it reveals an additional self-similar expansion regime, governed by the Poisson's ratio of the matrix, leading to a finite maximum radius, consistent with our experimental observations of growing Bacillus subtilis biofilms confined by polydimethylsiloxane.
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Affiliation(s)
- George T Fortune
- Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
| | - Nuno M Oliveira
- Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
- Department of Veterinary Medicine, University of Cambridge, Madingley Road, Cambridge CB3 0ES, United Kingdom
| | - Raymond E Goldstein
- Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences, University of Cambridge, Wilberforce Road, Cambridge CB3 0WA, United Kingdom
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11
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Peshkov A, McGaffigan S, Quillen AC. Synchronized oscillations in swarms of nematode Turbatrix aceti. SOFT MATTER 2022; 18:1174-1182. [PMID: 35029257 DOI: 10.1039/d1sm01572a] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
There is a recent surge of interest in the behavior of active particles that can at the same time align their direction of movement and synchronize their oscillations, known as swarmalators. While theoretical and numerical models of such systems are now abundant, no real-life examples have been shown to date. We present an experimental investigation of the collective motion of the nematode Turbatrix aceti that self-propel by body undulation. We discover that these nematodes can synchronize their body oscillations, forming striking traveling metachronal waves, which produces strong fluid flows. We uncover that the location and strength of this collective state can be controlled through the shape of the confining structure; in our case the contact angle of a droplet. This opens a way for producing controlled work such as on-demand flows or displacement of objects. We illustrate this by showing that the force generated by this state is sufficient to change the physics of evaporation of fluid droplets, by counteracting the surface-tension force, which allow us to estimate its strength. The relatively large size and ease of culture make Turbatrix aceti a promising model organism for experimental investigation of swarming and oscillating active matter capable of producing controllable work.
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Affiliation(s)
- Anton Peshkov
- Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA.
| | - Sonia McGaffigan
- Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA.
| | - Alice C Quillen
- Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA.
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12
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Boudaghi A, Foroutan M. Investigation of the wettability of chemically heterogeneous smooth and rough surfaces using molecular dynamics simulation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.118017] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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13
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Olson CM, Massari AM. The role of ultrafast structural dynamics with physical and chemical changes in polydimethylsiloxane thin films by two-dimensional IR spectroscopy. J Chem Phys 2021; 154:174902. [PMID: 34241076 DOI: 10.1063/5.0047463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Fourier transform infrared (FTIR) and two-dimensional IR (2D-IR) spectroscopies were applied to polydimethylsiloxane (PDMS) cross-linked elastomer films. The vibrational probe for the systems studied was a silicon hydride mode that was covalently bound to the polymer chains. The structure and dynamics reported by this mode were measured in response to a wide range of chemical and physical perturbations, including elevated curing temperature, increased curing agent concentration, mechanical compression, and cooling to near the glass transition temperature. The FTIR spectra were found to be relatively insensitive to all of these perturbations, and 2D-IR spectroscopy revealed that this was due to the overwhelming influence of heterogeneity on the spectral line shape. Surprisingly, the deconvoluted spectral line shapes showed that there were only slight differences in the heterogeneous and homogeneous dynamics even with the drastic macroscopic changes occurring in different systems. In the context of modeling polymer behavior, the results confirm that dynamics on the ultrafast time scale need not be included to properly model PDMS elasticity.
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Affiliation(s)
- Courtney M Olson
- Department of Chemistry, University of Minnesota, Twin Cities, Minneapolis, Minnesota 55455, USA
| | - Aaron M Massari
- Department of Chemistry, University of Minnesota, Twin Cities, Minneapolis, Minnesota 55455, USA
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14
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Zhang P, Chang KC, Abate AR. Precision ejection of microfluidic droplets into air with a superhydrophobic outlet. LAB ON A CHIP 2021; 21:1484-1491. [PMID: 33656500 PMCID: PMC8189694 DOI: 10.1039/d0lc01327g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Dispensing micron-scale droplets from a suspended nozzle is important for applications in bioprinting, analytical chemistry, and pharmaceutical formulation. Here, we describe a general approach to eject droplets from microfluidic devices using superhydrophobic patterning; this facilitates release of wetted fluids, allowing droplets to break contact with channel surfaces and travel along regular paths to achieve a printing accuracy of ∼3 μm. We demonstrate the utility of the approach by using it to print droplets of varied composition from a microfluidic mixing device. Our approach is compatible with common fabrication techniques making it applicable to devices configured for diverse applications.
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Affiliation(s)
- Pengfei Zhang
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA, USA.
| | - Kai-Chun Chang
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA, USA.
| | - Adam R Abate
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, San Francisco, CA, USA. and California Institute for Quantitative Biosciences, University of California, San Francisco, San Francisco, CA, USA and Chan Zuckerberg Biohub, San Francisco, CA, USA
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15
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Zhang R, Liao W, Wang Y, Wang Y, Ian Wilson D, Clarke SM, Yang Z. The growth and shrinkage of water droplets at the oil-solid interface. J Colloid Interface Sci 2021; 584:738-748. [PMID: 33317712 DOI: 10.1016/j.jcis.2020.09.102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/24/2020] [Accepted: 09/25/2020] [Indexed: 11/17/2022]
Abstract
HYPOTHESIS The mechanism for the spontaneous formation of water droplets at oil/solid interfaces immersed in water is currently unclear. We hypothesize that growth and shrinkage of droplets are kinetically controlled by diffusion of water through the oil, driven by differences in chemical potential between the solid substrate and the aqueous reservoir. EXPERIMENTS The formation, growth and shrinkage of water droplets at an immersed oil/solid interface are investigated theoretically and experimentally with three silicone oils. The surface is hydrophobic and the droplets formed are truncated spheres with radius, a, less than 10 μm. The expansion and contraction of the droplets can be controlled by adjusting the difference in chemical potential. The growth kinetics are modelled in terms of water migration through the oil layer which predicts a2∝t. FINDINGS This is the first study of possible mechanisms for the formation of such interfacial droplets. Several possible causes are shown to be unfavourable, negligible, or are eliminated by careful experiments controlling key parameters (such as oil viscosity, substrate chemistry). The rate constant for mass transport is proportional to difference in chemical potential and an estimate shows dissociation of surface groups on the substrate provides a driving chemical potential of the right magnitude.
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Affiliation(s)
- Ran Zhang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Wei Liao
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yunpeng Wang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Yao Wang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - D Ian Wilson
- Department of Chemical Engineering and Biotechnology, Philippa Fawcett Drive, University of Cambridge, Cambridge CB3 0AS, UK.
| | - Stuart M Clarke
- Department of Chemistry and BP Institute, Madingley Rise, University of Cambridge, Cambridge CB2 1EW, UK.
| | - Zhongqiang Yang
- Key Laboratory of Organic Optoelectronics and Molecular Engineering of the Ministry of Education, Department of Chemistry, Tsinghua University, Beijing 100084, China.
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16
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Insight of organic molecule dissolution and diffusion in cross-linked polydimethylsiloxane using molecular simulation. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118863] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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17
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Owen MJ. Silicone Surface Fundamentals. Macromol Rapid Commun 2020; 42:e2000360. [PMID: 32935908 DOI: 10.1002/marc.202000360] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/12/2020] [Indexed: 02/06/2023]
Abstract
Many of the applications of the most familiar silicone polymer, polydimethylsiloxane (PDMS), are a consequence of its hydrophobic nature. The key quantities underlying this behavior are the water contact angle with water droplets, the surface tension of the polymer, and its interfacial tension with water. These quantities are reviewed for PDMS and the fluorsilicone polymethyltrifluoropropylsiloxane (PMTFPS) as well as some other less common, more highly fluorinated, fluorosilicones. As aliphatic fluorocarbons are usually introduced into polymers to lower surface tension, it is unexpected that the surface tension of PMTFPS is higher than PDMS. However, this observation is consistent with Zisman's early extensive studies. It is also somewhat surprising that there are no definitive values accepted for the water contact angle with PDMS and the interfacial tension at the PDMS/water interface. Some reasons for this are explored and relevant limitations considered. The variety of ways in which a PDMS surface can be presented must have a major effect on the range of water contact angles reported.
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18
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Kim M, Moon J, Park S, Cho M. Selective Dissolution Resistance Control of EUV Photoresist Using Multiscale Simulation: Rational Design of Hybrid System. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b02378] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Muyoung Kim
- Institute of Advanced Machines and Design, Seoul National University, Seoul, Republic of Korea
- Division of Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Junghwan Moon
- Institute of Advanced Machines and Design, Seoul National University, Seoul, Republic of Korea
- Division of Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Sungwoo Park
- Division of Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
| | - Maenghyo Cho
- Institute of Advanced Machines and Design, Seoul National University, Seoul, Republic of Korea
- Division of Multiscale Mechanical Design, School of Mechanical and Aerospace Engineering, Seoul National University, Seoul, Republic of Korea
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19
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Fernandes Barros FM, Chassenieux C, de Souza Lima MM, Benyahia L. Structure and rheology during catastrophic phase inversion of Pickering emulsions stabilized with fumed silica particles. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2020.124630] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Capillary-assisted microfluidic biosensing platform captures single cell secretion dynamics in nanoliter compartments. Biosens Bioelectron 2020; 155:112113. [DOI: 10.1016/j.bios.2020.112113] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2019] [Revised: 02/06/2020] [Accepted: 02/18/2020] [Indexed: 02/07/2023]
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21
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Jin Y, Song K, Gellermann N, Huang Y. Printing of Hydrophobic Materials in Fumed Silica Nanoparticle Suspension. ACS APPLIED MATERIALS & INTERFACES 2019; 11:29207-29217. [PMID: 31333016 DOI: 10.1021/acsami.9b07433] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Freeform three-dimensional (3D) printing of functional structures from liquid hydrophobic build materials is of great significance and widely used in various fields such as soft robotics and microfluidics. In particular, a yield-stress support bath-enabled 3D-printing methodology has been emerging to fabricate complex 3D structures. Unfortunately, the reported support bath materials are either hydrophobic or not versatile enough for the printing of a wide range of hydrophobic materials. The objective of this study is to propose a fumed silica nanoparticle-based yield-stress suspension as a hydrophobic support bath to enable 3D extrusion printing of various hydrophobic ink materials in a printing-then-solidification fashion. Hydrophobic ink is freeform-deposited in a hydrophobic fumed silica-mineral oil suspension and maintains its shape during printing; it is not cured until the whole structure is complete. Various hydrophobic inks including poly(dimethylsiloxane) (PDMS), SU-8 resin, and epoxy-based conductive ink are printed into complex 3D structures in the fumed silica-mineral oil bath and then cured using relevant cross-linking mechanisms, even at a temperature as high as 90 °C, to prove the feasibility and versatility of the proposed printing approach. In addition, the deposited feature can easily reach a much better resolution such as 30 μm for PDMS filaments due to the negligible interfacial tension effect.
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22
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Fu J, Zhang H, Guo Z, Feng DQ, Thiyagarajan V, Yao H. Combat biofouling with microscopic ridge-like surface morphology: a bioinspired study. J R Soc Interface 2019. [PMID: 29514985 DOI: 10.1098/rsif.2017.0823] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Biofouling refers to the unfavourable attachment and accumulation of marine sessile organisms (e.g. barnacles, mussels and tubeworms) on the solid surfaces immerged in ocean. The enormous economic loss caused by biofouling in combination with the severe environmental impacts induced by the current antifouling approaches entails the development of novel antifouling strategies with least environmental impact. Inspired by the superior antifouling performance of the leaves of mangrove tree Sonneratia apetala, here we propose to combat biofouling by using a surface with microscopic ridge-like morphology. Settlement tests with tubeworm larvae on polymeric replicas of S. apetala leaves confirm that the microscopic ridge-like surface morphology can effectively prevent biofouling. A contact mechanics-based model is then established to quantify the dependence of tubeworm settlement on the structural features of the microscopic ridge-like morphology, giving rise to theoretical guidelines to optimize the morphology for better antifouling performance. Under the direction of the obtained guidelines, a synthetic surface with microscopic ridge-like morphology is developed, exhibiting antifouling performance comparable to that of the S. apetala replica. Our results not only reveal the underlying mechanism accounting for the superior antifouling property of the S. apetala leaves, but also provide applicable guidance for the development of synthetic antifouling surfaces.
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Affiliation(s)
- Jimin Fu
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People's Republic of China
| | - Hua Zhang
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People's Republic of China.,Department of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang 330022, People's Republic of China
| | - Zhenbin Guo
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People's Republic of China
| | - Dan-Qing Feng
- State-Province Joint Engineering Laboratory of Marine Bioproducts and Technology, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361005, People's Republic of China
| | - Vengatesen Thiyagarajan
- The Swire Institute of Marine Sciences and School of Biological Sciences, The University of Hong Kong, Hong Kong SAR, People's Republic of China
| | - Haimin Yao
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, People's Republic of China
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23
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Cataldi P, Profaizer M, Bayer IS. Preventing Water-Induced Mechanical Deterioration of Cardboard by a Sequential Polymer Treatment. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b00712] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Pietro Cataldi
- Smart Materials, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
| | - Mauro Profaizer
- Ghelfi
Ondulati
S.P.A., Via dei Lavoratori 10, 23010 Buglio in Monte, Italy
| | - Ilker S. Bayer
- Smart Materials, Istituto Italiano di Tecnologia, via Morego 30, 16163 Genova, Italy
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24
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Olson CM, Massari AM. Influence of Solvent Swelling on Ultrafast Structural Dynamics in Polydimethylsiloxane Thin Films by Two-Dimensional IR Spectroscopy. J Phys Chem A 2018; 122:1592-1599. [DOI: 10.1021/acs.jpca.7b12128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Courtney M. Olson
- Department of Chemistry, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455, United States
| | - Aaron M. Massari
- Department of Chemistry, University of Minnesota-Twin Cities, Minneapolis, Minnesota 55455, United States
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25
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Bartali R, Lamberti A, Bianco S, Pirri CF, Tripathi M, Gottardi G, Speranza G, Iacob E, Pugno N, Laidani N. Graphene as Barrier to Prevent Volume Increment of Air Bubbles over Silicone Polymer in Aqueous Environment. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12865-12872. [PMID: 29043815 DOI: 10.1021/acs.langmuir.7b02915] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The interaction of air bubbles with surfaces immersed in water is of fundamental importance in many fields of application ranging from energy to biology. However, many aspects of this topic such as the stability of surfaces in contact with bubbles remain unexplored. For this reason, in this work, we investigate the interaction of air bubbles with different kinds of dispersive surfaces immersed in water. The surfaces studied were polydimethylsiloxane (PDMS), graphite, and single layer graphene/PDMS composite. X-ray photoelectron spectroscopy (XPS) analysis allows determining the elemental surface composition, while Raman spectroscopy was used to assess the effectiveness of graphene monolayer transfer on PDMS. Atomic force microscopy (AFM) was used to study the surface modification of samples immersed in water. The surface wettability has been investigated by contact angle measurements, and the stability of the gas bubbles was determined by captive contact angle (CCA) measurements. CCA measurements show that the air bubble on graphite surface exhibits a stable behavior while, surprisingly, the volume of the air bubble on PDMS increases as a function of immersion time (bubble dynamic evolution). Indeed, the air bubble volume on the PDMS rises by increasing immersion time in water. The experimental results indicate that the dynamic evolution of air bubble in contact with PDMS is related to the rearrangement of surface polymer chains via the migration of the polar groups. On the contrary, when a graphene monolayer is present on PDMS, it acts as an absolute barrier suppressing the dynamic evolution of the bubble and preserving the optical transparency of PDMS.
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Affiliation(s)
- Ruben Bartali
- Fondazione Bruno Kessler, Center for Materials and Microsystems , via Sommarive 18, 38123 Povo, Trento, Italy
- Dipartimento di Fisica, Università di Trento , via Sommarive 14, 38123 Povo, Trento, Italy
| | - Andrea Lamberti
- Applied Science and Technology Department, Politecnico di Torino , Corso Duca degli Abruzzi 24, Turin IT-10129, Italy
| | - Stefano Bianco
- Applied Science and Technology Department, Politecnico di Torino , Corso Duca degli Abruzzi 24, Turin IT-10129, Italy
| | - Candido F Pirri
- Applied Science and Technology Department, Politecnico di Torino , Corso Duca degli Abruzzi 24, Turin IT-10129, Italy
| | - Manoj Tripathi
- Laboratory of Bio-Inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento , 38123 Trento, Italy
| | - Gloria Gottardi
- Fondazione Bruno Kessler, Center for Materials and Microsystems , via Sommarive 18, 38123 Povo, Trento, Italy
| | - Giorgio Speranza
- Fondazione Bruno Kessler, Center for Materials and Microsystems , via Sommarive 18, 38123 Povo, Trento, Italy
| | - Erica Iacob
- Fondazione Bruno Kessler, Center for Materials and Microsystems , via Sommarive 18, 38123 Povo, Trento, Italy
| | - Nicola Pugno
- Laboratory of Bio-Inspired and Graphene Nanomechanics, Department of Civil, Environmental and Mechanical Engineering, University of Trento , 38123 Trento, Italy
- School of Engineering and Materials Science, Queen Mary University of London , Mile End Road, E1 4NS London, United Kingdom
- Ket Lab, Edoardo Amaldi Foudation, Italian Space Agency , Via del Politecnico snc, 00133 Rome, Italy
| | - Nadhira Laidani
- Fondazione Bruno Kessler, Center for Materials and Microsystems , via Sommarive 18, 38123 Povo, Trento, Italy
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26
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Huang H, Cao F, Wu L, Sun H. All-atom and coarse-grained force fields for polydimethylsiloxane. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2017.1328597] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Hao Huang
- School of Chemistry and Chemical Engineering and Key Laboratory of Scientific and Engineering Computing of Ministry of Education, Shanghai Jiao Tong University, Shanghai, China
| | - Fenglei Cao
- School of Chemistry and Chemical Engineering and Key Laboratory of Scientific and Engineering Computing of Ministry of Education, Shanghai Jiao Tong University, Shanghai, China
| | - Liang Wu
- School of Chemistry and Chemical Engineering and Key Laboratory of Scientific and Engineering Computing of Ministry of Education, Shanghai Jiao Tong University, Shanghai, China
| | - Huai Sun
- School of Chemistry and Chemical Engineering and Key Laboratory of Scientific and Engineering Computing of Ministry of Education, Shanghai Jiao Tong University, Shanghai, China
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27
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Hübner J, Heinzler R, Arlt C, Hohmann S, Brenner-Weiß G, Franzreb M. An automated and compartmented fluidic reactor device for multi-step sample-to-answer processes using magnetic particles. REACT CHEM ENG 2017. [DOI: 10.1039/c6re00219f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A benchtop device that combines segmented flow with magnetic particle separation and active resuspension capabilities for biotechnological applications, e.g. biomolecule purification.
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Affiliation(s)
- J. Hübner
- Karlsruhe Institute of Technology (KIT)
- Institute of Functional Interfaces (IFG)
- Eggenstein-Leopoldshafen
- Germany
| | - R. Heinzler
- Karlsruhe Institute of Technology (KIT)
- Institute of Functional Interfaces (IFG)
- Eggenstein-Leopoldshafen
- Germany
| | - C. Arlt
- Karlsruhe Institute of Technology (KIT)
- Institute of Functional Interfaces (IFG)
- Eggenstein-Leopoldshafen
- Germany
| | - S. Hohmann
- Karlsruhe Institute of Technology (KIT)
- Institute of Functional Interfaces (IFG)
- Eggenstein-Leopoldshafen
- Germany
| | - G. Brenner-Weiß
- Karlsruhe Institute of Technology (KIT)
- Institute of Functional Interfaces (IFG)
- Eggenstein-Leopoldshafen
- Germany
| | - M. Franzreb
- Karlsruhe Institute of Technology (KIT)
- Institute of Functional Interfaces (IFG)
- Eggenstein-Leopoldshafen
- Germany
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28
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An H, Tan BH, Ohl CD. Distinguishing Nanobubbles from Nanodroplets with AFM: The Influence of Vertical and Lateral Imaging Forces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:12710-12715. [PMID: 27809541 DOI: 10.1021/acs.langmuir.6b02519] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The widespread application of surface-attached nanobubbles and nanodroplets in biomedical engineering and nanotechnology is limited by numerous experimental challenges, in particular, the possibility of contamination in nucleation experiments. These challenges are complicated by recent reports that it can be difficult to distinguish between nanoscale drops and bubbles. Here we identify clear differences in the mechanical responses of nanobubbles and nanodroplets under various modes of AFM imaging that subject the objects to predominantly vertical or lateral forces. This allows us to distinguish among nanodroplets, nanobubbles, and oil-covered nanobubbles in water.
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Affiliation(s)
- Hongjie An
- Cavitation Laboratory, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore
| | - Beng Hau Tan
- Cavitation Laboratory, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore
| | - Claus-Dieter Ohl
- Cavitation Laboratory, Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University , Singapore
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29
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Wettability and spontaneous penetration of a water drop into hydrophobic pores. J Colloid Interface Sci 2016; 477:176-80. [DOI: 10.1016/j.jcis.2016.05.029] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2016] [Revised: 04/18/2016] [Accepted: 05/17/2016] [Indexed: 11/23/2022]
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30
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Isele-Holder RE, Berkels B, Ismail AE. Smoothing of contact lines in spreading droplets by trisiloxane surfactants and its relevance for superspreading. SOFT MATTER 2015; 11:4527-4539. [PMID: 25955355 DOI: 10.1039/c4sm02298j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Superspreading, the greatly enhanced spreading of aqueous solutions of trisiloxane surfactants on hydrophobic substrates, is of great interest in fundamental physics and technical applications. Despite numerous studies in the last 20 years, the superspreading mechanism is still not well understood, largely because the molecular scale cannot be resolved appropriately either experimentally or using continuum simulations. The absence of molecular-scale knowledge has led to a series of conflicting hypotheses based on different assumptions of surfactant behavior. We report a series of large-scale molecular dynamics simulations of aqueous solutions of superspreading and non-superspreading surfactants on different substrates. We find that the transition from the liquid-vapor to the solid-liquid interface is smooth for superspreading conditions, allowing direct adsorption through the contact line. This finding complements a study [Karapetsas et al., J. Fluid Mech., 2011, 670, 5-37], which predicts that superspreading can occur if this adsorption path is possible. Based on the observed mechanism, we provide plausible explanations for the influence of the substrate hydrophobicity, the surfactant chain length, and the surfactant concentration on the superspreading phenomenon. We also briefly address that the observed droplet shape is a mechanism to overcome the Huh-Scriven paradox of infinite viscous dissipation at the contact line.
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Affiliation(s)
- Rolf E Isele-Holder
- Aachener Verfahrenstechnik, Molecular Simulations and Transformations, RWTH Aachen University, Schinkelstraße 2, 52062 Aachen, Germany.
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31
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Isele-Holder RE, Ismail AE. Atomistic potentials for trisiloxane, alkyl ethoxylate, and perfluoroalkane-based surfactants with TIP4P/2005 and application to simulations at the air-water interface. J Phys Chem B 2014; 118:9284-97. [PMID: 25003511 DOI: 10.1021/jp502975p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The mechanism of superspreading, the greatly enhanced spreading of water droplets facilitated by trisiloxane surfactants, is still under debate, largely because the role and behavior of the surfactants cannot be sufficiently resolved by experiments or continuum simulations. Previous molecular dynamics studies have been performed with simple model molecules or inaccurate models, strongly limiting their explanatory power. Here we present a force field dedicated to superspreading, extending existing quantum-chemistry-based models for the surfactant and the TIP4P/2005 water model ( Abascal et al. J. Chem. Phys. , 2005 , 123 , 234505 ). We apply the model to superspreading trisiloxane surfactants and nonsuperspreading alkyl ethoxylate and perfluoroalkane surfactants at various concentrations at the air-water interface. We show that the developed model accurately predicts surface tensions, which are typically assumed important for superspreading. Significant differences between superspreading and traditional surfactants are presented and their possible relation to superspreading discussed. Although the force field has been developed for superspreading problems, it should also perform well for other simulations involving polymers or copolymers with water.
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Affiliation(s)
- Rolf E Isele-Holder
- Aachener Verfahrenstechnik: Molecular Simulations and Transformations and AICES Graduate School, RWTH Aachen University , Schinkelstraße 2, 52062 Aachen, Germany
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32
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Salerno KM, Ismail AE, Lane JMD, Grest GS. Coating thickness and coverage effects on the forces between silica nanoparticles in water. J Chem Phys 2014; 140:194904. [DOI: 10.1063/1.4874638] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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33
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Eichelsdoerfer DJ, Brown KA, Wang MX, Mirkin CA. Role of Absorbed Solvent in Polymer Pen Lithography. J Phys Chem B 2013; 117:16363-8. [DOI: 10.1021/jp410494g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Daniel J. Eichelsdoerfer
- Department of Chemistry, §International Institute for Nanotechnology, ∥Department of Chemical
and Biological Engineering, Northwestern University, 2145 Sheridan
Road, Evanston, Illinois 60208, United States
| | - Keith A. Brown
- Department of Chemistry, §International Institute for Nanotechnology, ∥Department of Chemical
and Biological Engineering, Northwestern University, 2145 Sheridan
Road, Evanston, Illinois 60208, United States
| | - Mary X. Wang
- Department of Chemistry, §International Institute for Nanotechnology, ∥Department of Chemical
and Biological Engineering, Northwestern University, 2145 Sheridan
Road, Evanston, Illinois 60208, United States
| | - Chad A. Mirkin
- Department of Chemistry, §International Institute for Nanotechnology, ∥Department of Chemical
and Biological Engineering, Northwestern University, 2145 Sheridan
Road, Evanston, Illinois 60208, United States
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34
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Xu M, Zhang C, Du Z, Mi J. Role of Interfacial Structure of Water in Polymer Surface Wetting. Macromolecules 2013. [DOI: 10.1021/ma301526a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Mengjin Xu
- The Key Laboratory of Carbon Fiber and Functional Polymers, Ministry
of Education, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Chen Zhang
- The Key Laboratory of Carbon Fiber and Functional Polymers, Ministry
of Education, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Zhongjie Du
- The Key Laboratory of Carbon Fiber and Functional Polymers, Ministry
of Education, Beijing University of Chemical Technology, Beijing 100029, PR China
| | - Jianguo Mi
- State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing
100029, China
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35
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Chang KS, Chung YC, Yang TH, Lue SJ, Tung KL, Lin YF. Free volume and alcohol transport properties of PDMS membranes: Insights of nano-structure and interfacial affinity from molecular modeling. J Memb Sci 2012. [DOI: 10.1016/j.memsci.2012.06.019] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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36
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Liu Y, Wu M, Feng X, Shao X, Cai W. Adsorption Behavior of Hydrophobin Proteins on Polydimethylsiloxane Substrates. J Phys Chem B 2012; 116:12227-34. [DOI: 10.1021/jp304796p] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Yingzhe Liu
- College of Chemistry, Nankai University, Tianjin, 300071, People's Republic
of China
| | - Ming Wu
- College of Life
Science, Nankai University, Tianjin, 300071,
People's Republic
of China
| | - Xizeng Feng
- College of Life
Science, Nankai University, Tianjin, 300071,
People's Republic
of China
| | - Xueguang Shao
- College of Chemistry, Nankai University, Tianjin, 300071, People's Republic
of China
| | - Wensheng Cai
- College of Chemistry, Nankai University, Tianjin, 300071, People's Republic
of China
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37
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Yimer YY, Dhinojwala A, Tsige M. Interfacial properties of free-standing poly(3-hexylthiophene) films. J Chem Phys 2012; 137:044703. [DOI: 10.1063/1.4736571] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
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38
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Zubkov VV, Komarov PV. Simulating the ultrathin layer structure of dichloromethane on a solid substrate by means of density functional theory and molecular dynamics. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2012. [DOI: 10.1134/s0036024412070357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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Shemella PT, Laino T, Fritz O, Curioni A. Understanding the self-healing hydrophobic recovery of high-voltage insulators. J Phys Chem B 2012; 116:7351-6. [PMID: 22624664 DOI: 10.1021/jp300786s] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Amorphous siloxane polymers are designed to have high dielectric strength for use as high-voltage insulation materials. Surface hydrophobicity is essential and can be impaired by environmental, electrical, or mechanical factors, leading to leakage currents due to dielectric breakdown. Self-recovery is possible and is generally observed over a period of several hours. Using large-scale, all-atom molecular dynamics simulations, the surface wetting of water droplets on the polymer surface is simulated for various surface conditions, including oxidation and coating with small molecules, to understand the driving forces of the recovery process at the atomistic level, which is of primary importance for the developments of novel materials. In this work, we shed light onto the self-recovery mechanism and propose the use of low-molecular-weight (LMW) siloxane to accelerate the recovery of hydrophobicity.
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Lyons RA, Hassett JP, Flach AM, Cabasso I. Development of thin layer polymers to concentrate and detect aquatic contaminants. J Appl Polym Sci 2012. [DOI: 10.1002/app.37857] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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Sum Frequency Generation Vibrational Spectroscopy of Silicone Surfaces & Interfaces. ADVANCES IN SILICON SCIENCE 2012. [DOI: 10.1007/978-94-007-3876-8_2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Gao CY, Guo YY, He J, Wu M, Liu Y, Chen ZL, Cai WS, Yang YL, Wang C, Feng XZ. l-3,4-dihydroxyphenylalanine-collagen modified PDMS surface for controlled cell culture. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm00104g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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Shemella PT, Laino T, Fritz O, Curioni A. Surface Dynamics of Amorphous Polymers Used for High-Voltage Insulators. J Phys Chem B 2011; 115:13508-12. [DOI: 10.1021/jp207589p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Teodoro Laino
- IBM Research - Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland
| | - Oliver Fritz
- ABB Switzerland Ltd., Corporate Research, 5405 Baden-Dättwil, Switzerland
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Michalkova A, Tulyani S, Beals J, Leszczynski J. Theoretical study of the surface properties of poly(dimethylsiloxane) and poly(tetrafluoroethylene). J Mol Model 2011; 18:239-50. [DOI: 10.1007/s00894-011-1058-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2011] [Accepted: 03/22/2011] [Indexed: 11/27/2022]
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Madani-Grasset F, Bellouard Y. Femtosecond laser micromachining of fused silica molds. OPTICS EXPRESS 2010; 18:21826-21840. [PMID: 20941083 DOI: 10.1364/oe.18.021826] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The use of low-energy femtosecond laser beam combined with chemical etching has been proven to be an efficient method to fabricate three-dimensional structures in fused silica. For high-volume application, this technology--like other serial processes--suffers from a moderate production rate. Here, we show that femtosecond laser can also be employed to fabricate silica molds and other patterned surfaces, including surfaces with high aspect ratio features (> 10). Through appropriate tailoring of silica's surface property and subsequent creation of, for instance, simple elastomeric molding, new opportunities for the indirect 3D, multi-scale spatial characterization of deep laser-fabricated microstructures come along. We demonstrate that those moldings are characterized by a high fidelity (down to the nanometer scale) to the silica mold. These results further advance the applicability of femtosecond laser processing to glass.
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Affiliation(s)
- Frédéric Madani-Grasset
- Mechanical Engineering Department Eindhoven University of Technology Eindhoven, The Netherlands.
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