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Guo Y, Guo H, He D, Sun J, Chen W, Song Y, Zhou G. Development of Cyclic Tetrasiloxane Polymer as a High-Performance Dielectric and Hydrophobic Layer for Electrowetting Displays. ACS APPLIED MATERIALS & INTERFACES 2023; 15:46470-46482. [PMID: 37738528 DOI: 10.1021/acsami.3c08188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/24/2023]
Abstract
Cyclic tetrasiloxane polymer (CTP) has recently garnered interest as a hydrophobic material with unique properties. This study aims to enhance the dielectric constant of CTP films by introducing excess Si-H groups and to explore the impact of synthesis and processing conditions on the resulting properties. The film demonstrates high hydrophobicity, with contact angles of 107° in air and 165° in n-decane, along with a notable dielectric constant of 5.1°. Furthermore, the CTP film displays reversible electrowetting behavior with low contact angle hysteresis (2°) and possesses good transparency (∼99%) and thermal stability. As such, the CTP film has significant potential as a material for the electric wetting of hydrophobic dielectric layers and may serve as a promising alternative in electrowetting applications.
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Affiliation(s)
- Yuanyuan Guo
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
- Shenzhen Guohua Optoelectronics Tech., Co., Ltd., Shenzhen 518110, China
- Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China
| | - Hao Guo
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Dinggui He
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Jiaqi Sun
- University of Chinese Academy of Sciences, Ningbo Institute of Materials Technology and Engineering, Ningbo 315201, China
| | - Wangqiao Chen
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
| | - Yujie Song
- University of Chinese Academy of Sciences, Ningbo Institute of Materials Technology and Engineering, Ningbo 315201, China
| | - Guofu Zhou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology and Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, China
- Shenzhen Guohua Optoelectronics Tech., Co., Ltd., Shenzhen 518110, China
- Academy of Shenzhen Guohua Optoelectronics, Shenzhen 518110, China
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Wadhai SM, Sawane YB, Limaye AV, Banpurkar AG. Large tuning in the electrowetting behaviour on ferroelectric PVDF-HFP/Teflon AF bilayer. JOURNAL OF MATERIALS SCIENCE 2021; 56:16158-16166. [PMID: 34276067 PMCID: PMC8274264 DOI: 10.1007/s10853-021-06308-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Accepted: 06/30/2021] [Indexed: 06/13/2023]
Abstract
Electrowetting (EW) response on a dielectric depends on its permittivity value, Young contact angle and voltage amplitude. We present a large change in EW contact angle, from 163° to 80°, on the bilayer dielectric made up of ferroelectric PVDF-HFP with a thin layer of fluoropolymer. The thickness values of both layers were separately optimized for high effective capacitance essential for the large EW response. It reveals that the bilayer with ~ 500 nm thick PVDF-HFP layer and ~ 50 nm thin layer of Teflon results in the maximum value of effective dielectric constant, ε ≈ 8. Besides this gain, dc-voltage EW response exhibits hysteresis mainly due to polarization in the ferroelectric layer such that, hysteretic offset voltage was found to depend on the applied voltage amplitude and thickness of the dielectrics. Finally, bilayer was subjected to ac-voltage EW in silicone oil for ambient temperature ranging from - 25 to 70 °C. The consistent EW response in this ambient without any degradation/delamination of polymer surface confirmed the durability of the bilayer on the transparent ITO electrodes. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s10853-021-06308-z.
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Affiliation(s)
- Sandip M. Wadhai
- Department of Physics, Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Savitribai Phule Pune University, Pune, 411007 India
| | - Yogesh B. Sawane
- Department of Physics, Ahmednagar College, Ahmednagar, 414 001 India
| | - Abhay. V. Limaye
- Department of Physics, Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Savitribai Phule Pune University, Pune, 411007 India
| | - Arun G. Banpurkar
- Department of Physics, Centre for Advanced Studies in Materials Science and Condensed Matter Physics, Savitribai Phule Pune University, Pune, 411007 India
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Basu M, Parihar V, Lincon A, Joshi VP, Das S, DasGupta S. Development of graphene oxide – PDMS composite dielectric for rapid droplet movement in digital microfluidic applications. Chem Eng Sci 2021. [DOI: 10.1016/j.ces.2020.116175] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Mu X, Hou J, Feng Y, Tang B, Shui L, Wang Y, Li H, Zhou G. Configuration-Controllable Polymeric Nanovehicles Self-Assembled in Pixel Grids under an Electric Field. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4052-4060. [PMID: 31885247 DOI: 10.1021/acsami.9b16290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Polymeric nanovehicles have been widely applied in many fields, but during the process of preparation, it is still hard to reach the balance between precise structure control and mass production. In the present work, using industrial pixel grids as the macroscopic template, we applied dual effects of confinement and dielectric difference to speed up the self-assembly of polymeric nanovehicles, even to regulate the generated mesostructures and cargo loading. Within 2 min, a poly(ethylene glycol)-block-poly(d,l-lactide acid) (PEG-b-PDLLA) amphiphilic block copolymer layer was rapidly pushed off and broken down into uniform nanoparticles at 40 V. Hereinto, increasing volume of the outer aqueous phase in pixel grids favored the architectonic transformation of the generated nanovehicles from solid micelles with a diameter of 95 nm to hollow vesicles with a diameter of 232 nm. In particular, all the elements from the confinement cells to the preparation process can be completed via wet printing. Electric-field-induced pixel template technology is facile, cheap, controllable, and recyclable, and it is anticipated to promote continuous and bulk production of polymeric nanovehicles.
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Affiliation(s)
- Xin Mu
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Jiaxin Hou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Yancong Feng
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Biao Tang
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Lingling Shui
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Yao Wang
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Hao Li
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
| | - Guofu Zhou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics , South China Normal University , Guangzhou 510006 , China
- National Center for International Research on Green Optoelectronics , South China Normal University , Guangzhou 510006 , China
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Wu H, Dey R, Siretanu I, van den Ende D, Shui L, Zhou G, Mugele F. Electrically Controlled Localized Charge Trapping at Amorphous Fluoropolymer-Electrolyte Interfaces. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e1905726. [PMID: 31823510 DOI: 10.1002/smll.201905726] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/13/2019] [Indexed: 05/12/2023]
Abstract
Charge trapping is a long-standing problem in electrowetting on dielectric, causing reliability reduction and restricting its practical applications. Although this phenomenon is investigated macroscopically, the microscopic investigations are still lacking. In this work, the trapped charges are proven to be localized at the three-phase contact line (TPCL) region by using three detecting methods-local contact angle measurements, electrowetting (EW) probe, and Kelvin probe force microscopy. Moreover, it is demonstrated that this EW-assisted charge injection (EWCI) process can be utilized as a simple and low-cost method to deposit charges on fluoropolymer surfaces. Charge densities near the TPCL up to 0.46 mC m-2 and line widths of the deposited charge ranging from 20 to 300 µm are achieved by the proposed EWCI method. Particularly, negative charge densities do not degrade even after a "harsh" testing with a water droplet on top of the sample surfaces for 12 h, as well as after being treated by water vapor for 3 h. These findings provide an approach for applications which desire stable and controllable surface charges.
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Affiliation(s)
- Hao Wu
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
- Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, 7500AE, the Netherlands
| | - Ranabir Dey
- Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, 7500AE, the Netherlands
- Dynamics of Complex Fluids, Max Planck Institute for Dynamics and Self-organization, Am Fassberg 17, Goettingen, 37077, Germany
| | - Igor Siretanu
- Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, 7500AE, the Netherlands
| | - Dirk van den Ende
- Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, 7500AE, the Netherlands
| | - Lingling Shui
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
| | - Guofu Zhou
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology & Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
- National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou, 510006, P. R. China
- Shenzhen Guohua Optoelectronics Tech. Co. Ltd., Shenzhen, 518110, P. R. China
| | - Frieder Mugele
- Physics of Complex Fluids, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, Enschede, 7500AE, the Netherlands
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Moni G, Mayeen A, Abraham J, Jose T, M G M, Bhowmik R, George SC. Flexible FKM/mRGO nanocomposites with excellent thermal, mechanical and electrical properties. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.03.015] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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The Effect of the Terminal Functional Groups on Fluoropolymer on Electrowetting Device Performance. TECHNOLOGIES 2019. [DOI: 10.3390/technologies7030052] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Electrowetting on dielectric (EWOD) devices were fabricated using two hydrophobic organic fluoropolymers, comprising CYTOP (a product name) having different chemical structures only at the terminal functional groups. These devices were subsequently characterized by applying a range of direct current (DC) voltages. The data demonstrated that the EWOD performance was dramatically improved upon incorporating a CYTOP polymer having highly polar terminal functional groups, as compared to a polymer having terminal groups with lower polarity. The new finding about the positive effect of highly polar terminal functional groups on the enhancement of EWOD was exhibited through various careful experiments, changing only the quantitative amount of polar terminal functional groups while keeping other factors constant (thickness, substrate, etc.).
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P(VDF-TrFE)/PMMA Blended Films with Enhanced Electrowetting Responses and Superior Energy Storage Performance. Polymers (Basel) 2019; 11:polym11030526. [PMID: 30960510 PMCID: PMC6473694 DOI: 10.3390/polym11030526] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2019] [Revised: 03/15/2019] [Accepted: 03/18/2019] [Indexed: 11/21/2022] Open
Abstract
P(VDF-TrFE) (vinylidene fluoride-co-trifluoroethylene)/PMMA (PVT/PMMA) blended films synthesized through a facile solution-blending method show outstanding performance for practical electrowetting and energy storage applications. The van der Waals forces and dipolar interactions in neighboring P(VDF-TrFE) and PMMA chains, together with the suppressed free volume (or defect) are critical to the significantly-enhanced electrical properties. Typical, Teflon-covered P(VDF-TrFE)/PMMA blended film exhibits a high dielectric constant of 13 with low dielectric loss (~0.05) at 100 Hz and a large initial contact angle of 122°. Its electrowetting response with a contact angle modulation of 50° in air and low contact angle hysteresis demonstrate that it is promising for low-voltage electrowetting applications. Furthermore, with an energy density of 11.8 J/cm3, approximately double that of pure P(VDF-TrFE), PVT/PMMA blended films containing 20 wt % PMMA turn out to be superior materials for energy storage applications, due to their significantly-enhanced polarization and reduced remnant polarization.
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Xia Y, Chen J, Zhu Z, Zhang Q, Yang H, Wang Q. Significantly enhanced dielectric and hydrophobic properties of SiO2@MgO/PMMA composite films. RSC Adv 2018. [DOI: 10.1039/c7ra12695f] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
In this article, we provide a feasible method to prepare high-dielectric-constant hydrophobic composite films, which show potential application as the insulator layer in electrowetting devices.
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Affiliation(s)
- Yuting Xia
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Jiayun Chen
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Zhicai Zhu
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Qilong Zhang
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Hui Yang
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
| | - Qianqian Wang
- School of Materials Science and Engineering
- State Key Lab Silicon Mat
- Zhejiang University
- Hangzhou 310027
- PR China
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