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Fabrication of single-layer antireflective coating with environmental stability by modified SiO2 mixed sol. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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2
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Structure and Properties of Organofluorosilicon Polymers Based on Organotrialkoxysilanes RFOCH2Si(ORF)3. JOURNAL OF POLYMER RESEARCH 2021. [DOI: 10.1007/s10965-021-02526-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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3
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Yamazaki T, Tenjimbayashi M, Manabe K, Moriya T, Nakamura H, Nakamura T, Matsubayashi T, Tsuge Y, Shiratori S. Antifreeze Liquid-Infused Surface with High Transparency, Low Ice Adhesion Strength, and Antifrosting Properties Fabricated through a Spray Layer-by-Layer Method. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.8b05927] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Taku Yamazaki
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Mizuki Tenjimbayashi
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Kengo Manabe
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Takeo Moriya
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Hiroki Nakamura
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | | | - Takeshi Matsubayashi
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Yosuke Tsuge
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
| | - Seimei Shiratori
- Center for Material Design Science, School of Integrated Design Engineering, Graduate School of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa 223-8522, Japan
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4
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Preparation of carboxylated silver nanoparticles via a reverse micelle method and covalent stacking onto porous substrates via amide bond formation. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2018.05.037] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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Saeki D, Matsuyama H. Ultrathin and ordered stacking of silica nanoparticles via spin-assisted layer-by-layer assembly under dehydrated conditions for the fabrication of ultrafiltration membranes. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2016.09.056] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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6
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Mizoshita N, Tanaka H. Versatile Antireflection Coating for Plastics: Partial Embedding of Mesoporous Silica Nanoparticles onto Substrate Surface. ACS APPLIED MATERIALS & INTERFACES 2016; 8:31330-31338. [PMID: 27768270 DOI: 10.1021/acsami.6b10624] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Antireflection (AR) coating for transparent plastic substrates is constructed by partially embedding mesoporous silica nanoparticles (MSNs) onto the surface of the substrates. Simulation of optical properties of polymer substrates coated with a single-particle MSN layer indicates that the surface has a low and graded refractive index in the direction of the thickness and effectively decreases the reflectance of visible light. The MSN-coated surfaces can be prepared by exposure of the MSN-painted substrates to a solvent vapor, irrespective of the shape of the polymer substrates. The plastic substrates with a single-particle layer of MSNs with diameters of 145-165 nm exhibit high transparency and good AR behavior as simulated. The mesoporous structures of MSNs play important roles not only in decreasing the refractive index but also in strengthening the adhesion between MSNs and substrate surfaces. Moreover, fixation of MSNs onto a thermosetting epoxy resin is successfully achieved by transfer of a single layer of MSNs from flexible films for which MSNs are weakly bonded. The present simple AR coating is applicable to a wide range of substrates with various materials and shapes, and useful for various applications such as optical devices, displays, and solar cells.
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Affiliation(s)
| | - Hiromitsu Tanaka
- Toyota Central R&D Laboratories, Inc. , Nagakute, Aichi 480-1192, Japan
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7
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Viau L, Vrlinic T, Jurin FE, Lakard B. Elaboration of thin colloidal silica films with controlled thickness and wettability. CR CHIM 2016. [DOI: 10.1016/j.crci.2016.01.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Warring SL, Beattie DA, McQuillan AJ. Surficial Siloxane-to-Silanol Interconversion during Room-Temperature Hydration/Dehydration of Amorphous Silica Films Observed by ATR-IR and TIR-Raman Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1568-76. [PMID: 26804934 DOI: 10.1021/acs.langmuir.5b04506] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Silica has been frequently studied using infrared and Raman spectroscopy due to its importance in many practical contexts where its surface chemistry plays a vital role. The majority of these studies have utilized chemical-vapor-deposited films in vacuo after high-temperature calcination. However, room-temperature hydration and dehydration of thin silica particle films has not been well characterized in spite of the importance of such films as substrates for polymer and surfactant adsorption. The present study has utilized ATR-IR spectroscopy and thin silica particle films exposed to varying humidity to clearly show reversible conversion between surface siloxanes and hydrogen-bonded silanols without the need for semiempirical peak deconvolution. The IR spectra from corresponding hydration experiments on deuterated silica films has confirmed the vibrational mode assignments. The variation of humidity over silica films formed from silica suspensions of differing pH gave IR spectra consistent with the change in the relative populations of siloxide to silanol surface groups. In addition, total internal reflection Raman spectroscopy has been used to provide further evidence of room-temperature dehydroxylation, with spectral evidence for the presence of three-membered siloxane rings when films are dehydrated under argon. The confirmation of room-temperature siloxane-to-silanol interconversion is expected to benefit understanding in many silica surface chemical contexts.
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Affiliation(s)
- Suzanne L Warring
- Department of Chemistry, University of Otago , P. O Box 56, Dunedin 9054, New Zealand
| | - David A Beattie
- Future Industries Institute, University of South Australia , Mawson Lakes, Adelaide, SA 5095, Australia
| | - A James McQuillan
- Department of Chemistry, University of Otago , P. O Box 56, Dunedin 9054, New Zealand
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9
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Sarkar S, Chattopadhyay R, Jana S. Structural and light coupling characteristics of patterned silica–titania sol–gel thin films with/without nano gold coatings. RSC Adv 2016. [DOI: 10.1039/c6ra20411b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Soft lithography-based 1-dimensional/2-dimensional patterned silica–titania sol–gel thin films with/without nano-Au coatings and their light coupling characteristics.
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Affiliation(s)
- Saswati Sarkar
- Sol–Gel Division
- CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI)
- Kolkata 700032
- India
| | - Rik Chattopadhyay
- Fibre Optics and Photonics Division
- CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI)
- Kolkata 700032
- India
| | - Sunirmal Jana
- Sol–Gel Division
- CSIR-Central Glass and Ceramic Research Institute (CSIR-CGCRI)
- Kolkata 700032
- India
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10
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Guo F, Guo Z. Inspired smart materials with external stimuli responsive wettability: a review. RSC Adv 2016. [DOI: 10.1039/c6ra04079a] [Citation(s) in RCA: 112] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Recent progress in smart surfaces with responsive wettability upon external stimuli is reviewed and some of the barriers and potentially promising breakthroughs in this field are also briefly discussed.
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Affiliation(s)
- Fei Guo
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
- Hubei University
- Wuhan 430062
- People's Republic of China
| | - Zhiguang Guo
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials
- Ministry of Education Key Laboratory for the Green Preparation and Application of Functional Materials
- Hubei University
- Wuhan 430062
- People's Republic of China
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11
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Mizoshita N, Ishii M, Kato N, Tanaka H. Hierarchical Nanoporous Silica Films for Wear Resistant Antireflection Coatings. ACS APPLIED MATERIALS & INTERFACES 2015; 7:19424-19430. [PMID: 26275209 DOI: 10.1021/acsami.5b05659] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High-performance antireflection (AR) layers were prepared by depositing hierarchical nanoporous silica films on glass substrates. We designed a composite layer consisting of mesoporous silica nanoparticles (MSNs) and a mesoporous silica matrix. The introduction of bimodal nanoporous structures, i.e., independent nanopore formation within the MSN and within the matrix, was achieved by using surface-protected MSNs and a polymeric nonionic surfactant template during the fabrication process. A porosity of more than 40% was achieved for composite AR materials. The protrusion of MSNs from the matrix led to spontaneous formation of nanoscale roughness on the surface of the coatings, which enhanced the AR properties. The solid bonding of the MSNs to the nanoporous matrices played an important role in the achievement of high mechanical durability. The optimal nanoporous coating, which contained ca. 50 wt % MSN, exhibited high transparency (91.5-97.5%) and low reflectance (<2.2%), over the whole range of visible light wavelengths, and sufficient wear resistance.
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Affiliation(s)
| | - Masahiko Ishii
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Naohiko Kato
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
| | - Hiromitsu Tanaka
- Toyota Central R&D Laboratories, Inc., Nagakute, Aichi 480-1192, Japan
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12
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Ladilina EY, Lyubova TS, Kuznetsova OV, Klapshin YP, Baten’kin MA, Sidorenko KV, Glukhova TA, Gorshkov ON. A new fluorinated alkoxysilane with a branched cyclic substituent and the properties of the related polymers. POLYMER SCIENCE SERIES B 2015. [DOI: 10.1134/s1560090415020074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Cao X, Wang N, Law JY, Loo SCJ, Magdassi S, Long Y. Nanoporous thermochromic VO₂ (M) thin films: controlled porosity, largely enhanced luminous transmittance and solar modulating ability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1710-5. [PMID: 24495102 DOI: 10.1021/la404666n] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Vanadium dioxide is the most widely researched thermochromic material with a phase transition temperature (τ(c)) of around 68 °C, and its thermochromic performance can be enhanced by adding nanoporosity. Freeze-drying has been employed to fabricate nanostructures with different porosities from 16 to 45% by varying the prefreezing temperature and precursor concentration. The luminous transmittance (Tlum) and solar modulating ability (ΔTsol) are greatly enhanced as a result of increasing pore size and pore density. The freeze-dried sample with 7.5 mL of H2O2 precursor dip-coated at 300 mm/min gives the best combination of thermochromic properties (Tlum ≈ 50%, ΔTsol = 14.7%), which surpasses the best combined thermochromic performance reported to date that we are aware of (Tlum ≈ 41%, ΔTsol = 14.1%).
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Affiliation(s)
- Xun Cao
- School of Materials Science and Engineering and ‡Facility for Analysis, Characterization, Testing and Simulation, Nanyang Technological University , 50 Nanyang Avenue, Singapore 639798
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14
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Affiliation(s)
- Smriti Singh
- DWI an der RWTH Aachen e.V. Functional and Interactive Polymers and Institute for Technical and Macromolecular Chemistry, RWTH Aachen University; 52056 Aachen Germany
| | - Martin Möller
- DWI an der RWTH Aachen e.V. Functional and Interactive Polymers and Institute for Technical and Macromolecular Chemistry, RWTH Aachen University; 52056 Aachen Germany
| | - Andrij Pich
- DWI an der RWTH Aachen e.V. Functional and Interactive Polymers and Institute for Technical and Macromolecular Chemistry, RWTH Aachen University; 52056 Aachen Germany
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15
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Cao Y, Cakmak M, Soucek M. Antireflective coatings using organically modified silica and polyimide via solution casting method. POLYM ENG SCI 2013. [DOI: 10.1002/pen.23477] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Y. Cao
- Department of Polymer Engineering; The University of Akron; Akron Ohio 44325
| | - M. Cakmak
- Department of Polymer Engineering; The University of Akron; Akron Ohio 44325
| | - M.D. Soucek
- Department of Polymer Engineering; The University of Akron; Akron Ohio 44325
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16
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Structurally colored surfaces with antireflective, self-cleaning, and antifogging properties. J Colloid Interface Sci 2012; 381:189-97. [DOI: 10.1016/j.jcis.2012.05.037] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2012] [Revised: 05/16/2012] [Accepted: 05/18/2012] [Indexed: 11/19/2022]
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17
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You JH, Lee BI, Lee J, Kim H, Byeon SH. Superhydrophilic and antireflective La(OH)3/SiO2-nanorod/nanosphere films. J Colloid Interface Sci 2011; 354:373-9. [DOI: 10.1016/j.jcis.2010.10.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 09/09/2010] [Accepted: 10/07/2010] [Indexed: 10/19/2022]
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18
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Du X, Li X, He J. Facile fabrication of hierarchically structured silica coatings from hierarchically mesoporous silica nanoparticles and their excellent superhydrophilicity and superhydrophobicity. ACS APPLIED MATERIALS & INTERFACES 2010; 2:2365-2372. [PMID: 20735109 DOI: 10.1021/am1003766] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Silica coatings with hierarchical structures were prepared on glass substrates via layer-by-layer assembly using hierarchically mesoporous silica nanoparticles as building block. These coatings demonstrated excellent superhydrophilic properties. After hydrophobic modification, the obtained coatings exhibited hydrophobic properties in the measurements of water contact angles by employing contact-mode and drip-mode, respectively. Water droplet of large volume (15 muL) had a smaller sliding angle than that of small volume (3 muL) when using the contact-mode due to the role of gravity despite the existence of large adhesive force between water droplet and the coating surface, while very small sliding angles were noted when using the drip-mode because of the existence of kinetic energy. The transmittance of fabricated coatings was enhanced and reduced, respectively, in the long and short wavelength ranges as compared with blank slide glass.
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Affiliation(s)
- Xin Du
- Functional Nanomaterials Laboratory and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry (TIPC), Chinese Academy of Sciences, Zhongguancun Beiyitiao 2, Haidianqu, Beijing 100190, China
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19
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Vogel R, Persson M, Feng C, Parkin SJ, Nieminen TA, Wood B, Heckenberg NR, Rubinsztein-Dunlop H. Synthesis and surface modification of birefringent vaterite microspheres. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11672-9. [PMID: 19788220 DOI: 10.1021/la901532x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This paper reports on the synthesis of birefringent vaterite microspheres with narrow size distribution using a seeded growth method. In a post-treatment the microspheres were stabilized and functionalized through coating with a combination of organosilica and silica. The coating vastly enhanced the stability of the vaterite microspheres in biological buffers and allowed the attachment of biomolecules such as DNA or proteins. As an example, streptavidin was attached to the surface of the functionalized microspheres. These results pave the way for the use of birefringent vaterite particles for the micromanipulation of single biological molecules such as DNA or specific proteins in an optical trap capable of exerting and measuring torques. The stabilized birefringent microspheres may also find use for biosensor and biological screening applications.
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Affiliation(s)
- Robert Vogel
- The University of Queensland, Centre for Biophotonics and Laser Science, School of Mathematics and Physics, St. Lucia QLD 4072, Australia
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20
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Ray MA, Shewmon N, Bhawalkar S, Jia L, Yang Y, Daniels ES. Submicrometer surface patterning using interfacial colloidal particle self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:7265-7270. [PMID: 19499940 DOI: 10.1021/la900257p] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Hexagonal noncontiguously packed (HNCP) arrays of submicrometer-sized particles trapped at an air-water interface are successfully transferred to solid substrates. The long-range order of the hexagonal arrays at the interface can be improved by compression-relaxation cycles. The interparticle distance (i.e., the periodicity of the hexagonal array) can be controlled by varying the degree of compression of the particle film. The critical characteristics of the substrate surface are hydrophobicity (advancing water contact angle of >70 degrees) and a charge complementary to the surface of the particles. Suitable silicon and glass substrates are easily prepared by treatment with commercially available organosilicon compounds. Two transfer processes have been developed. When the parallel transfer process is used, the HNCP arrays are deposited on the solid substrates with minimal pattern distortion. The vertical dipping transfer distorts the pattern and renders a sense of directionality perpendicular to the dipping direction. This surface patterning technique is applied to fabrication of subwavelength grating for antireflection in the visible region. Antireflective HNCP arrays comprising varied particle diameters and pattern periodicities are fabricated on glass substrates to demonstrate the effects of these parameters on the antireflection performance.
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Affiliation(s)
- Matthew A Ray
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, USA
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21
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Mohammed JS, McShane M. Polymer/colloid surface micromachining: micropatterning of hybrid multilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:13796-13803. [PMID: 18989945 DOI: 10.1021/la802637u] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Fabrication of multicomponent patterned films comprising polymer/nanoparticle multilayers using conventional lithography and bottom-up layer-by-layer nanofabrication techniques is described. The work is motivated by the potential to extend polymer surface micromachining capabilities toward construction of integrated systems by connecting discrete domains of active materials containing functional nanoparticles. Modified surfaces illustrate tunability of the physical (thickness, roughness, 3D structures) and chemical (inorganic/organic material combinations) properties of the nanocomposite micropatterns. Intriguing nanoscale phenomena were observed for the structures when the order of material deposition was changed; the final multilayer thickness and surface roughness and mechanical integrity of the patterns were found to be interdependent and related to the roughness of layers deposited earlier in the process.
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22
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Ha JW, Park IJ, Lee SB. Antireflection Surfaces Prepared from Fluorinated Latex Particles. Macromolecules 2008. [DOI: 10.1021/ma801224w] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jong-Wook Ha
- Biorefinery Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-343, Korea
| | - In Jun Park
- Biorefinery Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-343, Korea
| | - Soo-Bok Lee
- Biorefinery Research Center, Korea Research Institute of Chemical Technology, Daejeon 305-343, Korea
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23
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Zhang L, Li Y, Sun J, Shen J. Mechanically stable antireflection and antifogging coatings fabricated by the layer-by-layer deposition process and postcalcination. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10851-10857. [PMID: 18767828 DOI: 10.1021/la801806r] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Complexes of poly(diallyldimethylammonium chloride) (PDDA) and sodium silicate (PDDA-silicate) are alternately deposited with poly(acrylic acid) (PAA) to fabricate PAA/PDDA-silicate multilayer films. The removal of the organic components in the PAA/PDDA-silicate mulilayer films through calcination produces highly porous silica coatings with excellent mechanical stability and good adhesion to substrates. Quartz substrates covered with such porous silica coatings exhibit both antireflection and antifogging properties because of the reduced refractive index and superhydrophilicity of the resultant films. A maximum transmittance of 99.86% in the visible spectral range is achieved for the calcinated PAA/PDDA-silicate films deposited on quartz substrates. The wavelengths of maximum transmittance could be well tailored by simply changing the deposition cycles of multilayer films. The usage of PDDA-silicate complexes allows for the introduction of high porosity to the resultant silica coatings, which favors the fabrication of antireflection and antifogging coatings with enhanced performance. Meanwhile, PDDA-silicate complexes enable rapid fabrication of thick porous silica coatings after calcination because of the large dimensions of the complexes in solution. The easy availability of the materials and simplicity of this method for film fabrication might make the mechanically stable multifunctional antireflection and antifogging coatings potentially useful in a variety of applications.
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Affiliation(s)
- Lianbin Zhang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, People's Republic of China
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24
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Su B, Lu X, Lu Q. Oriented SBA-15-type silica films on polyimide films with laser-induced periodic microgrooves. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:9695-9699. [PMID: 18646875 DOI: 10.1021/la800595v] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Oriented mesostructured silica films show potential for the design of nanostructured materials for applications in optics, electronics, and so on. In this report, we propose a new approach to control the orientation of mesochannels using a laser-modified polyimide surface. Pluronic 123 was employed as the structure agent, and mesostructured SBA-15-type silica film was prepared using dip- and spin-coating techniques. The orientation of the mesochannels was evaluated by in-plane X-ray diffraction (XRD) measurements. It was shown that the mesochannels were oriented along the surface microgrooves. The driving force for the orientation of the mesochannels is attributed to the confining effect of the surface microgrooves on the deposited mesochannels.
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Affiliation(s)
- Bin Su
- Department of Polymer Science and Engineering, School of Chemistry and Chemical Technology, Shanghai Jiao Tong University, Shanghai 200240, P.R. China
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25
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Composite films of polycations and TiO2 nanoparticles with photoinduced superhydrophilicity. J Colloid Interface Sci 2008; 324:127-33. [DOI: 10.1016/j.jcis.2008.05.018] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2007] [Revised: 05/01/2008] [Accepted: 05/01/2008] [Indexed: 11/22/2022]
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26
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Gemici Z, Shimomura H, Cohen RE, Rubner MF. Hydrothermal treatment of nanoparticle thin films for enhanced mechanical durability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:2168-2177. [PMID: 18232719 DOI: 10.1021/la703074r] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The mechanical durability of nanoporous all-nanoparticle and polymer-nanoparticle layer-by-layer (LbL) films (80-150 nm thick) on both glass and polycarbonate substrates has been greatly enhanced by hydrothermal treatment (124-134 degrees C). Polymer-nanoparticle films were more durable than all-nanoparticle films after hydrothermal treatment. The optical properties of nanoporous antireflection (AR) films were exploited in an abrasion test (25-100 kPa normal stress) to quantify the extent of abrasive wear observed qualitatively by scanning electron microscopy (SEM). Marginal damage was observed under optimal reinforcement conditions. Untreated films not only delaminated from the surface completely but also damaged their underlying glass and polycarbonate substrates during testing. The nature of the substrate was found to play an important role in determining abrasion resistance, regardless of the level of particle fusion in the film. The low-temperature process enables in situ mechanical reinforcement of otherwise delicate nanoparticle assemblies on plastic substrates. Tribochemical wear was found to planarize the nanoscale surface texture of these films, similar to what is observed in chemo-mechanical polishing (CMP). This finding is useful for anyone trying to make robust superhydrophobic or superhydrophilic coatings. To our knowledge, this is the first report on hydrothermal reinforcement of LbL films.
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Affiliation(s)
- Zekeriyya Gemici
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Wang L, Wang X, Xu M, Chen D, Sun J. Layer-by-layer assembled microgel films with high loading capacity: reversible loading and release of dyes and nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:1902-1909. [PMID: 18205423 DOI: 10.1021/la7031048] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Multilayer films containing microgels of chemically cross-linked poly(allylamine hydrochloride) (PAH) and dextran (named PAH-D) were fabricated by layer-by-layer deposition of PAH-D and poly(styrene sulfonate) (PSS). The successful fabrication of PAH-D/PSS multilayer films was verified by quartz crystal microbalance measurements and cross-sectional scanning electron microscopy. The as-prepared PAH-D/PSS multilayer films can reversibly load and release negatively charged dyes such as methyl orange (MO) and fluorescein sodium and mercaptoacetic acid-stabilized CdTe nanoparticles. The loading capacity of the film for MO can be as large as approximately 3.0 microg/cm2 per bilayer, which corresponds to a MO density of 0.75 g/cm3 in the film. The high loading capacity of the PAH-D/PSS films originates from the cross-linked film structure with sufficient binding groups of protonated amine groups, as well as their high swelling capability by solvent. The loaded material can be released slowly when immersing the films in 0.9% normal saline. Meanwhile, the PAH-D/PSS multilayer films could deposit directly on either hydrophilic or hydrophobic substrates such as quartz, polytetrafluoroethylene, polystyrene, poly(ethylene terephthalate), and polypropylene. The microgel films of PAH-D/PSS are expected to be widely useful as matrixes for loading functional guest materials and even for controlled release.
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Affiliation(s)
- Lin Wang
- College of Chemistry, Jilin University, Changchun, People's Republic of China
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Zhang L, Li Y, Sun J, Shen J. Layer-by-layer fabrication of broad-band superhydrophobic antireflection coatings in near-infrared region. J Colloid Interface Sci 2008; 319:302-8. [DOI: 10.1016/j.jcis.2007.11.020] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2007] [Revised: 11/09/2007] [Accepted: 11/18/2007] [Indexed: 10/22/2022]
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Wu Z, Lee D, Rubner MF, Cohen RE. Structural color in porous, superhydrophilic, and self-cleaning SiO2/TiO2 Bragg stacks. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:1445-51. [PMID: 17583907 DOI: 10.1002/smll.200700084] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Thin-film Bragg stacks exhibiting structural color have been fabricated by a layer-by-layer (LbL) deposition process involving the sequential adsorption of nanoparticles and polymers. High- and low-refractive-index regions of quarter-wave stacks were generated by calcining LbL-assembled multilayers containing TiO(2) and SiO(2) nanoparticles, respectively. The physical attributes of each region were characterized by a recently developed ellipsometric method. The structural color characteristics of the resultant nanoporous Bragg stacks could be precisely tuned in the visible region by varying the number of stacks and the thickness of the high- and low-refractive-index stacks. These Bragg stacks also exhibited potentially useful superhydrophilicity and self-cleaning properties.
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Affiliation(s)
- Zhizhong Wu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
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Podsiadlo P, Sui L, Elkasabi Y, Burgardt P, Lee J, Miryala A, Kusumaatmaja W, Carman MR, Shtein M, Kieffer J, Lahann J, Kotov NA. Layer-by-layer assembled films of cellulose nanowires with antireflective properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7901-6. [PMID: 17585790 DOI: 10.1021/la700772a] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Natural nanowires (NWs) of cellulose obtained from a marine animal tunicate display surprisingly high uniformity and aspect ratio comparable with synthetic NWs. Their layer-by-layer assembled (LBL) films show strong antireflection (AR) properties having an origin in a novel highly porous architecture reminiscent of a "flattened matchsticks pile", with film-thickness-dependent porosity and optical properties created by randomly oriented and overlapping NWs. At an optimum number of LBL deposition cycles, light transmittance reaches nearly 100% (lambda approximately 400 nm) when deposited on a microscope glass slide and the refractive index is approximately 1.28 at lambda = 532 nm. In accordance with AR theory, the transmittance maximum red-shifts and begins to decrease after reaching the maximum with increasing film thickness as a result of increased light scattering. This first example of LBL layers of cellulose NWs can be seen as an exemplary structure for any rigid axial nanocolloids, for which, given the refractive index match, AR properties are expected to be a common property. Unique mechanical properties of the tunicate NWs are also a great asset for optical coatings.
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Affiliation(s)
- Paul Podsiadlo
- Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
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Han JT, Kim S, Karim A. UVO-tunable superhydrophobic to superhydrophilic wetting transition on biomimetic nanostructured surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:2608-14. [PMID: 17269808 DOI: 10.1021/la0629072] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A novel strategy for a tunable sigmoidal wetting transition from superhydrophobicity to superhydrophilicity on a continuous nanostructured hybrid film via gradient UV-ozone (UVO) exposure is presented. Along a single wetting gradient surface (40 mm), we could visualize the superhydrophobic (thetaH2O > 165 degrees and low contact angle hysteresis) transition (165 degrees > thetaH2O > 10 degrees ) and superhydrophilic (thetaH2O < 10 degrees within 1 s) regions simply through the optical images of water droplets on the surface. The film is prepared through layer-by-layer assembly of negatively charged silica nanoparticles (11 nm) and positively charged poly(allylamine hydrochloride) with an initial deposition in a fractal manner. The extraordinary wetting transition on chemically modified nanoparticle layered surfaces with submicrometer- to micrometer-scale pores represents a competition between the chemical wettability and hierarchical roughness of surfaces as often occurs in nature (e.g., lotus leaves, insect wings, etc).
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Affiliation(s)
- Joong Tark Han
- Polymers Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA
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Prevo BG, Hon EW, Velev OD. Assembly and characterization of colloid-based antireflective coatings on multicrystalline silicon solar cells. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b612734g] [Citation(s) in RCA: 136] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zhang X, Fujishima A, Jin M, Emeline AV, Murakami T. Double-Layered TiO2−SiO2 Nanostructured Films with Self-Cleaning and Antireflective Properties. J Phys Chem B 2006; 110:25142-8. [PMID: 17201053 DOI: 10.1021/jp064442u] [Citation(s) in RCA: 143] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Dual function of self-cleaning and antireflection can be created in double-layered TiO2-SiO2 nanostructured films. The film were prepared by (1) layer-by-layer deposition of multilayered SiO2 nanoparticles with polydiallyldimethylammonium (PDDA) cations, (2) layer-by-layer deposition of multilayered titanate nanosheets with polications on PDDA/SiO2 multilayer films, and (3) burning out the polymer and converting titanate nanosheets into TiO2 by hearing at 500 degrees C. The as-prepared films, consisting of a porous SiO2 bottom layer and a dense TiO2 top layer, improved the transmittance of glass or quartz substrates, as demonstrated by transmission spectra collected at normal incidence. The photocatalytic properties of the films were studied by the change of the water contact angle together with the decay of the IR absorption of the hydrocarbon chain of octadecylphosphonic-acid-modified films under 2.6 mW cm-2 UV illumination. Both the antireflective and the photocatalytic properties of the films were dependent on the number of PDDA/nanosheet bilayers deposited. however, excellent surface wettability of the films for water was obtained, independent of the preparation conditions. The experimental findings are discussed in terms of the special structure of the double-layered nanostructured film.
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Abstract
All-nanoparticle thin-film coatings that exhibit antireflection, antifogging (superhydrophilicity), and self-cleaning properties have been prepared via layer-by-layer deposition of TiO(2) and SiO(2) nanoparticles. The porosity and chemical composition of the coatings were determined using a simple method that is based on ellipsometry and does not require any assumptions about the refractive indices of the constituent nanoparticles. The presence of nanopores in the TiO(2)/SiO(2) nanoparticle coatings results in superhydrophilicity as well as antireflection properties. The superhydrophilicity of contaminated coatings could also be readily recovered and retained after ultraviolet irradiation.
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Affiliation(s)
- Daeyeon Lee
- Department of Chemical Engineering, Department of Materials Science and Engineering, and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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Cebeci FC, Wu Z, Zhai L, Cohen RE, Rubner MF. Nanoporosity-driven superhydrophilicity: a means to create multifunctional antifogging coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2856-62. [PMID: 16519495 DOI: 10.1021/la053182p] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Multifunctional nanoporous thin films have been fabricated from layer-by-layer assembled silica nanoparticles and a polycation. The resultant multilayer films were found to exhibit both antifogging and antireflection properties. The antifogging properties are a direct result of the development of superhydrophilic wetting characteristics (water droplet contact angle <5 degrees within 0.5 s or less). The nearly instantaneous sheetlike wetting promoted by the superhydrophilic multilayer prevents light scattering water droplets from forming on a surface. The low refractive index of the multilayer film (as low as 1.22) resulting from the presence of nanopores was found to impart excellent antireflection properties. Glass slides coated on both sides with a nanoporous multilayer film exhibited transmission levels as high as 99.8%. Stable superhydrophilic wetting characteristics were obtained only after a critical number of bilayers were deposited onto a surface. The assembly conditions (solution pH and nanoparticle concentration), as well as the choice of nanoparticle size, were found to strongly influence film properties. It is suggested that the superhydrophilic behavior is driven by the rapid infiltration of water into a 3D nanoporous network created under specific assembly conditions.
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Affiliation(s)
- Fevzi C Cebeci
- Department of Materials Science and Engineering and Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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