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Kim ET, Park J, Kim C, Simmonds AG, Sung YE, Pyun J, Char K. Conformal Polymeric Multilayer Coatings on Sulfur Cathodes via the Layer-by-Layer Deposition for High Capacity Retention in Li-S Batteries. ACS Macro Lett 2016; 5:471-475. [PMID: 35607235 DOI: 10.1021/acsmacrolett.6b00144] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
We report on the conformal coating of thickness-tunable multilayers directly onto the sulfur (S8) cathodes by the layer-by-layer (LbL) deposition for the significant improvement in the performances of Li-S batteries even without key additives (LiNO3) in the electrolyte. Poly(ethylene oxide) (PEO)/poly(acrylic acid) (PAA) multilayers on a single poly(allylamine hydrochloride) (PAH)/PAA priming bilayer, deposited on the S8 cathodes, effectively protected from the polysulfide leakage, while providing a Li+ ion diffusion channel. As a result, PAH/PAA/(PEO/PAA)3 multilayer-coated cathodes exhibited the highest capacity retention (806 mAh g-1) after 100 cycles at 0.5 C, as well as the high C-rate capability up to 2.0 C. Furthermore, the multilayer coating effectively mitigated the polysulfide shuttle effect in the absent of LiNO3 additives in the electrolyte.
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Affiliation(s)
| | | | - Chunjoong Kim
- Department
of Materials Science and Engineering, Chungnam National University, Daejeon 34134, Korea
| | - Adam G. Simmonds
- Department
of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
| | | | - Jeffrey Pyun
- Department
of Chemistry and Biochemistry, University of Arizona, Tucson, Arizona 85721, United States
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2
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Cho I, Kim BJ, Ryu SW, Cho JH, Cho J. Transistor memory devices with large memory windows, using multi-stacking of densely packed, hydrophobic charge trapping metal nanoparticle array. NANOTECHNOLOGY 2014; 25:505604. [PMID: 25426661 DOI: 10.1088/0957-4484/25/50/505604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Organic field-effect transistor (OFET) memories have rapidly evolved from low-cost and flexible electronics with relatively low-memory capacities to memory devices that require high-capacity memory such as smart memory cards or solid-state hard drives. Here, we report the high-capacity OFET memories based on the multilayer stacking of densely packed hydrophobic metal NP layers in place of the traditional transistor memory systems based on a single charge trapping layer. We demonstrated that the memory performances of devices could be significantly enhanced by controlling the adsorption isotherm behavior, multilayer stacking structure and hydrophobicity of the metal NPs. For this study, tetraoctylammonium (TOA)-stabilized Au nanoparticles (TOA-Au(NPs)) were consecutively layer-by-layer (LbL) assembled with an amine-functionalized poly(amidoamine) dendrimer (PAD). The formed (PAD/TOA-Au(NP))(n) films were used as a multilayer stacked charge trapping layer at the interface between the tunneling dielectric layer and the SiO2 gate dielectric layer. For a single AuNP layer (i.e. PAD/TOA-Au(NP))1) with a number density of 1.82 × 10(12) cm(-2), the memory window of the OFET memory device was measured to be approximately 97 V. The multilayer stacked OFET memory devices prepared with four Au(NP) layers exhibited excellent programmable memory properties (i.e. a large memory window (ΔV(th)) exceeding 145 V, a fast switching speed (1 μs), a high program/erase (P/E) current ratio (greater than 10(6)) and good electrical reliability) during writing and erasing over a relatively short time scale under an operation voltage of 100 V applied at the gate.
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Affiliation(s)
- Ikjun Cho
- Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea
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3
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Park M, Kim Y, Ko Y, Cheong S, Ryu SW, Cho J. Amphiphilic Layer-by-Layer Assembly Overcoming Solvent Polarity between Aqueous and Nonpolar Media. J Am Chem Soc 2014; 136:17213-23. [DOI: 10.1021/ja509168g] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Minkyung Park
- Department
of Chemical and Biological Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - Younghoon Kim
- Department
of Chemical and Biological Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - Yongmin Ko
- Department
of Chemical and Biological Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - Sanghyuk Cheong
- Department
of Chemical and Biological Engineering, Korea University, Seoul 136-713, Republic of Korea
| | - Sook Won Ryu
- Department
of Laboratory Medicine, Kangwon National University School of Medicine, Chuncheon-si, Gangwon-do, Republic of Korea
| | - Jinhan Cho
- Department
of Chemical and Biological Engineering, Korea University, Seoul 136-713, Republic of Korea
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4
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Chen J, Duchet J, Portinha D, Charlot A. Layer by layer H-bonded assembly of P4VP with various hydroxylated PPFS: impact of the donor strength on growth mechanism and surface features. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10740-10750. [PMID: 25081421 DOI: 10.1021/la502370h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Hydrogen bond mediated films made by step by step deposition of poly(4-vinylpyridine) (P4VP) and hydroxylated poly(2,3,4,5,6-pentafluorostyrene) (PPFS) copolymers prepared by thiol para-fluoro coupling, bearing either one (PPFSME) or two (PPFSMPD) hydrogenated hydroxyl groups or a (poly)fluorinated hydroxyl (PPFSOH), respectively, were successfully constructed. The influence of the structural parameters, such as the hydroxyl environment (which dictates the H-bond strength) was in-depth investigated in terms of their impact on (i) growth mechanism, (ii) internal organization, and (iii) surface features. The use of the weaker H-bond donor partner (PPFSME) leads to low quality films composed of irregularly distributed aggregates. While [PPFSMPD/P4VP] multilayer films are comparatively thick and composed of stratified layers with smooth topology, the use of PPFSOH with P4VP yields thin films made of mixed and interpenetrated polymer layers. Playing on the interaction strength appears as a powerful tool to elaborate tailored multilayer films with molecularly tunable properties.
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Affiliation(s)
- Jing Chen
- Université de Lyon , INSA Lyon, UMR CNRS 5223, Ingénierie des Matériaux Polymères, F-69621 Villeurbanne, France
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5
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Castleberry SA, Li W, Deng D, Mayner S, Hammond PT. Capillary flow layer-by-layer: a microfluidic platform for the high-throughput assembly and screening of nanolayered film libraries. ACS NANO 2014; 8:6580-6589. [PMID: 24836460 PMCID: PMC4133994 DOI: 10.1021/nn501963q] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 05/16/2014] [Indexed: 05/30/2023]
Abstract
Layer-by-layer (LbL) assembly is a powerful tool with increasing real world applications in energy, biomaterials, active surfaces, and membranes; however, the current state of the art requires individual sample construction using large quantities of material. Here we describe a technique using capillary flow within a microfluidic device to drive high-throughput assembly of LbL film libraries. This capillary flow layer-by-layer (CF-LbL) method significantly reduces material waste, improves quality control, and expands the potential applications of LbL into new research spaces. The method can be operated as a simple lab benchtop apparatus or combined with liquid-handling robotics to extend the library size. Here we describe and demonstrate the technique and establish its ability to recreate and expand on the known literature for film growth and morphology. We use the same platform to assay biological properties such as cell adhesion and proliferation and ultimately provide an example of the use of this approach to identify LbL films for surface-based DNA transfection of commonly used cell types.
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Affiliation(s)
- Steven A. Castleberry
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
- Harvard-MIT Division of Health Sciences and Technology, Cambridge, Massachusetts, United States
| | - Wei Li
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
| | - Di Deng
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
| | - Sarah Mayner
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
| | - Paula T. Hammond
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
- Koch Institute of Integrative Cancer Research, Massachusetts Institute of Technology, Cambridge, Massachusetts, United States
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6
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Abbott SB, de Vos WM, Mears LLE, Barker R, Richardson RM, Prescott SW. Hydration of Odd–Even Terminated Polyelectrolyte Multilayers under Mechanical Confinement. Macromolecules 2014. [DOI: 10.1021/ma500557m] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Stephen B. Abbott
- School
of Physics, University of Bristol, Bristol BS8 1TL, U.K
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
| | - Wiebe M. de Vos
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
- Membrane
Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, Netherlands
| | | | - Robert Barker
- Institut
Laue Langevin, 6 Rue Jules Horowitz, F-38042 Grenoble, France
| | | | - Stuart W. Prescott
- School of Chemistry, University of Bristol, Bristol BS8 1TS, U.K
- School of Chemical Engineering, UNSW Australia, Sydney NSW 2052, Australia
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7
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Kim Y, Kook K, Hwang SK, Park C, Cho J. Polymer/Perovskite-type nanoparticle multilayers with multielectric properties prepared from ligand addition-induced layer-by-layer assembly. ACS NANO 2014; 8:2419-2430. [PMID: 24571293 DOI: 10.1021/nn405988d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We introduce an adsorption mechanism for a layer-by-layer (LbL) assembly (i.e., a ligand addition-induced LbL assembly) and demonstrate that the (polymer/perovskite nanoparticle (NP))n nanocomposite films based on the ligand addition LbL exhibit ferroelectric and resistive switching properties. Oleic acid (OA)-stabilized BaTiO3 NPs (OA-BTO NPs) with a size of approximately 8 nm were LbL-assembled with amine-functionalized dendrimers (NH2-dendrimers) using the high affinity between NH2 moieties and Ti ions. The ferroelectric properties of the (NH2-dendrimer/OA-BTO NP)n multilayers were generated by the Ti disorder in the OA-BTO NP unit cell despite the use of sub-10 nm OA-BTO NPs (i.e., OA-BTO NPs), which are near the critical size for ferroelectric properties. Additionally, the (NH2-dendrimer/OA-BTO NP)n multilayers sandwiched between the bottom (platinum) and top (silver or tungsten) electrodes exhibited a resistive switching memory at a relatively low operating voltage below 2 V with a switching speed of approximately 100 ns and an ON/OFF current ratio of approximately 10(4). Furthermore, the ferroelectric and resistive switching properties could be further improved by controlling the bilayer number (n). We believe that our approach can provide a basis for designing and exploiting multifunctional memory electronics based on a variety of perovskite NPs with ferroelectric properties.
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Affiliation(s)
- Younghoon Kim
- Department of Chemical & Biological Engineering, Korea University , Anam-dong, Seongbuk-gu, Seoul 136-713, South Korea
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8
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Kuila BK, Formanek P, Stamm M. Multilayer polymer thin films for fabrication of ordered multifunctional polymer nanocomposites. NANOSCALE 2013; 5:10849-10852. [PMID: 24064567 DOI: 10.1039/c3nr03607c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Here, we describe a novel and versatile approach for fabrication of multilayer polymeric thin films with a tunable, ordered periodic structure in each layer using self-assembly of block copolymers. Different functional nanomaterials are selectively introduced in different layers with controlled arrays and network formation resulting in ordered multifunctional nanocomposite thin films.
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Affiliation(s)
- Biplab K Kuila
- Department of Nanostructured Materials, Leibniz Institute of Polymer Research Dresden, Hohe Strasse 6, D-01069 Dresden, Germany.
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9
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Baek H, Lee C, Lim KI, Cho J. Resistive switching memory properties of layer-by-layer assembled enzyme multilayers. NANOTECHNOLOGY 2012; 23:155604. [PMID: 22456233 DOI: 10.1088/0957-4484/23/15/155604] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The properties of enzymes, which can cause reversible changes in currents through redox reactions in solution, are of fundamental and practical importance in bio-electrochemical applications. These redox properties of enzymes are often associated with their charge-trap sites. Here, we demonstrate that reversible changes in resistance in dried lysozyme (LYS) films can be generated by an externally applied voltage as a result of charge trap/release. Based on such changes, LYS can be used as resistive switching active material for nonvolatile memory devices. In this study, cationic LYS and anionic poly(styrene sulfonate) (PSS) layers were alternately deposited onto Pt-coated silicon substrates using a layer-by-layer assembly method. Then, top electrodes were deposited onto the top of LYS/PSS multilayers to complete the fabrication of the memory-like device. The LYS/PSS multilayer devices exhibited typical resistive switching characteristics with an ON/OFF current ratio above 10(2), a fast switching speed of 100 ns and stable performance. Furthermore, the insertion of insulating polyelectrolytes (PEs) between the respective LYS layers significantly enhanced the memory performance of the devices showing a high ON/OFF current ratio of ~10(6) and low levels of power consumption.
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Affiliation(s)
- Hyunhee Baek
- Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-713, Korea
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10
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Hwang S, Choi CH, Lee CS. Regioselective surface modification of pdms microfluidic device for the generation of monodisperse double emulsions. Macromol Res 2012. [DOI: 10.1007/s13233-012-0048-8] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Kim YH, Lee YM, Park J, Ko MJ, Park JH, Jung W, Yoo PJ. Spontaneous surface flattening via layer-by-layer assembly of interdiffusing polyelectrolyte multilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17756-17763. [PMID: 20883048 DOI: 10.1021/la103282m] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We report a facile means to achieve planarization of nonflat or patterned surfaces by utilizing the layer-by-layer (LbL) assembly of highly diffusive polyelectrolytes. The polyelectrolyte pair of linear polyethylenimine (LPEI) and poly(acrylic acid) (PAA) is known to maintain intrinsic diffusive mobility atop or even inside ionically complexed films prepared by LbL deposition. Under highly hydrated and swollen conditions during the sequential film buildup process, the LbL-assembled film of LPEI/PAA undergoes a topological self-deformation for minimizing surface area to satisfy the minimum-energy state of the surface, which eventually induces surface planarization along with spontaneous filling of surface textures or nonflat structures. This result is clearly different from other cases of applying nondiffusive polyelectrolytes onto patterned surfaces or confined structures, wherein surface roughening or incomplete filling is developed with the LbL assembly. Therefore, the approach proposed in this study can readily allow for surface planarization with the deposition of a relatively thin layer of polyelectrolyte multilayers. In addition, this strategy of planarization was extended to the surface modification of an indium tin oxide (ITO) substrate, where surface smoothing and enhanced optical transmittance were obtained without sacrificing the electronic conductivity. Furthermore, we investigated the potential applicability of surface-treated ITO substrates as photoelectrodes of dye-sensitized solar cells prepared at room temperature. As a result, an enhanced photoconversion efficiency and improved device characteristics were obtained because of the synergistic role of polyelectrolyte deposition in improving the optical properties and acting as a blocking layer to prevent electron recombination with the electrolytes.
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Affiliation(s)
- Young Hun Kim
- School of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea
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12
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Kessler D, Theato P. Reactive surface coatings based on polysilsesquioxanes: defined adjustment of surface wettability. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:14200-14206. [PMID: 19371043 DOI: 10.1021/la9005949] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have investigated a generally applicable protocol for a substrate-independent reactive polymer coating that offers interesting possibilities for further molecular tailoring via simple wet chemical derivatization reactions. Poly(methylsilsesquioxane)-poly(pentafluorophenyl acrylate) hybrid polymers have been synthesized by RAFT polymerization, and stable reactive surface coatings have been prepared by spin-coating on the following substrates: Si, glass, gold, PMMA, PDMS, and steel. These coatings have been used for a defined adjustment of surface wettability by surface-analogous reaction with various amines (e.g., glutamic acid to obtain hydrophilic surfaces (Theta(a) = 18 degrees) or perfluorinated amines to obtain hydrophobic surfaces (Theta(a) = 138 degrees)). Besides the successful covalent attachment of small molecules and polymers, amino-functionalized nanoparticles could also be deposited on the surface, resulting in nanostructured coatings, thereby expanding the accessible contact angle of hydrophobic surfaces further to Theta(a) = 152 degrees. The surface-analogous conversion of the reactive coating with isopropyl amine produced in situ temperature-responsive coatings. Using the presented simple, generally applicable protocol for substrate-independent reactive polymer coatings, the contact angle of water could be switched reversibly by almost 60 degrees.
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Affiliation(s)
- Daniel Kessler
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, 55099 Mainz, Germany
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13
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Okamura Y, Kabata K, Kinoshita M, Saitoh D, Takeoka S. Free-Standing Biodegradable Poly(lactic acid) Nanosheet for Sealing Operations in Surgery. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2009; 21:4388-92. [PMID: 26042950 DOI: 10.1002/adma.200901035] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2009] [Revised: 05/10/2009] [Indexed: 05/02/2023]
Abstract
A free-standing biodegradable nanosheet composed of poly(L-lactic acid) (PLLA) was shown to have excellent sealing efficacy for a gastric incision as a novel wound dressing material that did not require adhesive agents, and the PLLA nanosheet-induced wound repair showed neither scars nor tissue adhesion. This material may, therefore, be an ideal alternative to conventional tissue repairing procedures using suture/ligation in surgery.
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Affiliation(s)
- Yosuke Okamura
- Department of Life Science and Medical Bioscience Graduate School of Advanced Science and Engineering Waseda University, TWIns Shinjuku-ku, Tokyo, 162-8480 (Japan)
| | - Koki Kabata
- Department of Life Science and Medical Bioscience Graduate School of Advanced Science and Engineering Waseda University, TWIns Shinjuku-ku, Tokyo, 162-8480 (Japan)
| | - Manabu Kinoshita
- Department of Immunology and Microbiology National Defense Medical College Tokorozawa, Saitama, 359-8513 (Japan)
| | - Daizoh Saitoh
- Division of Traumatology National Defense Medical College Tokorozawa, Saitama, 359-8513 (Japan)
| | - Shinji Takeoka
- Department of Life Science and Medical Bioscience Graduate School of Advanced Science and Engineering Waseda University, TWIns Shinjuku-ku, Tokyo, 162-8480 (Japan).
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14
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An M, Hong JD. Surface modification of hafnia with polyelectrolytes based on the spin-coating electrostatic self-assembly method. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2009.07.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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15
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Fujie T, Park JY, Murata A, Estillore NC, Tria MCR, Takeoka S, Advincula RC. Hydrodynamic transformation of a freestanding polymer nanosheet induced by a thermoresponsive surface. ACS APPLIED MATERIALS & INTERFACES 2009; 1:1404-1413. [PMID: 20355942 DOI: 10.1021/am900111r] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
Freestanding quasi-two-dimensional ultrathin films (e.g., 41 nm thick polymer nanosheets) were produced, on which stimuli-responsive 47 nm thick polymer brushes were constructed by atom transfer radical polymerization (ATRP) of poly(N-isopropylacrylamide). The resulting surfaces of the multilayered polysaccharide ultrathin films were evaluated by ellipsometry, IR imaging, in situ variable-temperature atomic force microscopy (AFM), and contact angle measurements. The morphological transformation of the freestanding polymer nanosheet bearing thermoresponsive polymer brushes was observed macroscopically through reversible structural color changes at the air-water interface. The dynamic shape change of the nanosheet was also monitored with the addition of a surfactant such as sodium n-dodecylsulfate to reduce the hydrophobicity of the surface. It was then demonstrated that the highly flexible freestanding polymer nanosheet is capable of acting as a unique platform for inducing stimuli-responsive behavior in nanomaterials.
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Affiliation(s)
- Toshinori Fujie
- Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University (TWIns), 2-2 Wakamatsu-cho, Shinjuku-ku, Tokyo 162-8480, Japan
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16
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Kim H, Lyu YY, Choi K, Zentel R, Lee SH, Char K. Tunable Phosphorescent Emission through Energy Transfer within Multilayer Thin Films Based on a Carbazole-Based Host and Ir(III)-Complex Guest System. Macromol Rapid Commun 2009; 30:1232-7. [DOI: 10.1002/marc.200900023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2009] [Accepted: 02/03/2009] [Indexed: 11/10/2022]
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17
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Selective surface modification of free-standing polysaccharide nanosheet with micro/nano-particles identified by structural color changes. Colloids Surf A Physicochem Eng Asp 2009. [DOI: 10.1016/j.colsurfa.2008.09.056] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Lee S, Lee B, Kim BJ, Park J, Yoo M, Bae WK, Char K, Hawker CJ, Bang J, Cho J. Free-Standing Nanocomposite Multilayers with Various Length Scales, Adjustable Internal Structures, and Functionalities. J Am Chem Soc 2009; 131:2579-87. [DOI: 10.1021/ja8064478] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Seryun Lee
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Bokyoung Lee
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Bumjoon J. Kim
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Junwoo Park
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Misang Yoo
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Wan Ki Bae
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Kookheon Char
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Craig J. Hawker
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Joona Bang
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
| | - Jinhan Cho
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea, Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305-701, Korea, Department of Chemical and Biological Engineering, Korea University, Anam-dong, Seongbuk-gu, Seoul 136-701, Korea, School of Chemical and Biological Engineering, Seoul National University, San 56-1, Shinlim-dong, Kwanak-gu, Seoul 151-744, Korea, and Materials
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Park J, Kim J, Lee S, Bang J, Kim BJ, Kim YS, Cho J. Free-standing film electronics using photo-crosslinking layer-by-layer assembly. ACTA ACUST UNITED AC 2009. [DOI: 10.1039/b908568h] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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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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21
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Zimnitsky D, Shevchenko VV, Tsukruk VV. Perforated, freely suspended layer-by-layer nanoscale membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:5996-6006. [PMID: 18457436 DOI: 10.1021/la7038575] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Ultrathin, perforated, and freely suspended membranes with uniform nanopores in the range of tens of nanometers have been fabricated using a fast, simple method of spin-assisted layer-by-layer assembly on hydrophobic substrates. Membranes with thicknesses down to 20 nm were robust enough to be released from the sacrificial substrates, transferred onto various surfaces, and suspended over microscopic openings. The nanopore size can be controlled by tuning the number of polyelectrolyte bilayers, spinning speed, and a proper selection of hydrophobic substrates. We demonstrate that the formation of nanopores is caused by the partial dewetting of polyelectrolyte layers in the course of their deposition on the underlying hydrophobic surfaces. The nanoscale thickness of perforated membranes with relatively uniform size and a high concentration of nanopores provides perspectives for higher rates of transport through freely suspended LbL membranes. The highly perforated LbL membranes introduced here can serve as a novel platform for ultrafine separation considering an intriguing combination of nanopores, nanoscale membrane thickness, and easy functionalization.
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Affiliation(s)
- Dmitry Zimnitsky
- Georgia Institute of Technology, School of Materials Science and Engineering, Atlanta, Georgia 30332, USA
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22
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Hoda N, Kumar S. Brownian dynamics simulations of polyelectrolyte adsorption in shear flow: Effects of solvent quality and charge patterning. J Chem Phys 2008; 128:164907. [DOI: 10.1063/1.2901052] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Takeoka S, Okamura Y, Fujie T, Fukui Y. Development of biodegradable nanosheets as nanoadhesive plaster. PURE APPL CHEM 2008. [DOI: 10.1351/pac200880112259] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Sheet-shaped carriers having both obverse and reverse surfaces (thus, a large contact area for targeting a site and adhesive properties without any chemical cross-linker onto tissue surface) have several advantages as surgical dressings. These advantages include active targeting over spherically shaped carriers, which thus have an extremely small contact area for targeting sites. Here, we propose a novel methodology for preparation of a free-standing, ultra-thin, and biocompatible polymer nanosheet having heterosurfaces, fabricated through macromolecular assembly. In the context of biomedical applications, the targeted properties include injectable sheet-shaped drug carriers having precisely controlled size by exploiting micropatterned substrate, and giant polymer nanosheets composed of biocompatible polysaccharides. A huge aspect ratio, in excess of 106, is particularly applicable for novel surgical dressings. These biocompatible polymer nanosheets having heterosurfaces can thus be regarded as new biomaterials for minimally invasive treatment.
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Affiliation(s)
- Shinji Takeoka
- 1Consolidated Research Institute for Advanced Science and Medical Care, Waseda University, Tokyo, 169-8555, Japan
| | - Yosuke Okamura
- 2Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
| | - Toshinori Fujie
- 2Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
| | - Yoshihito Fukui
- 2Department of Life Science and Medical Bioscience, Graduate School of Advanced Science and Engineering, Waseda University, Tokyo, 169-8555, Japan
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24
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Hoda N, Kumar S. Brownian dynamics simulations of polyelectrolyte adsorption in shear flow with hydrodynamic interaction. J Chem Phys 2007; 127:234902. [DOI: 10.1063/1.2806187] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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25
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Lee JS, Cho J, Lee C, Kim I, Park J, Kim YM, Shin H, Lee J, Caruso F. Layer-by-layer assembled charge-trap memory devices with adjustable electronic properties. NATURE NANOTECHNOLOGY 2007; 2:790-5. [PMID: 18654433 DOI: 10.1038/nnano.2007.380] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2007] [Accepted: 10/22/2007] [Indexed: 05/14/2023]
Abstract
We describe a versatile approach for preparing flash memory devices composed of polyelectrolyte/gold nanoparticle multilayer films. Anionic gold nanoparticles were used as the charge storage elements, and poly(allylamine)/poly(styrenesulfonate) multilayers deposited onto hafnium oxide (HfO2)-coated silicon substrates formed the insulating layers. The top contact was formed by depositing HfO2 and platinum. In this study, we investigated the effect of increasing the number of polyelectrolyte and gold nanoparticle layers on memory performance, including the size of the memory window (the critical voltage difference between the 'programmed' and 'erased' states of the devices) and programming speed. We observed a maximum memory window of about 1.8 V, with a stored electron density of 4.2 x 1012 cm-2 in the gold nanoparticle layers, when the devices consist of three polyelectrolyte/gold nanoparticle layers. The reported approach offers new opportunities to prepare nanostructured polyelectrolyte/gold nanoparticle-based memory devices with tailored performance.
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Affiliation(s)
- Jang-Sik Lee
- School of Advanced Materials Engineering, Kookmin University, Jeongneung-dong, Seongbuk-gu, Seoul 136-702, Korea.
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26
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Lee W, Hyung KH, Kim YH, Cai G, Han SH. Polyelectrolytes-organometallic multilayers for efficient photocurrent generation: [polypropylviologen/RuL2(NCS)2/(PEDOT;PSS)]n on ITO. Electrochem commun 2007. [DOI: 10.1016/j.elecom.2006.10.020] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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27
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Mhamdi L, Picart C, Lagneau C, Othmane A, Grosgogeat B, Jaffrezic-Renault N, Ponsonnet L. Study of the polyelectrolyte multilayer thin films' properties and correlation with the behavior of the human gingival fibroblasts. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2006. [DOI: 10.1016/j.msec.2005.10.049] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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28
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Cho J, Jang H, Yeom B, Kim H, Kim R, Kim S, Char K, Caruso F. Modulating the pattern quality of micropatterned multilayer films prepared by layer-by-layer self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:1356-64. [PMID: 16430305 DOI: 10.1021/la052057a] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Patterned multilayer films composed of poly(allylamine hydrochloride) (PAH) and poly(sodium 4-styrenesulfonate) (PSS) were prepared using dip and spin self-assembly (SA) methods. A silicon substrate was patterned with a photoresist thin film using conventional photolithography, and PAH/PSS multilayers were then deposited onto the substrate surface using dip or spin SA. For spin SA, the photoresist on the substrate was retained, despite the high centrifugal forces involved in depositing the polyelectrolytes (PEs). The patterned multilayer films were formed by immersing the PE-coated substrates in acetone for 10 min. The effect of ionic strength on the pattern quality in dip and spin multilayer patterns (line-edge definition and surface roughness of the patterned region) was investigated by increasing the salt concentration in the PE solution (range 0-1 M). In dip multilayer patterns, the presence of salt increased the film surface roughness and pattern thickness without any deformation of pattern shape. The spin multilayer patterns formed without salt induced a height profile of about 130 nm at the pattern edge, whereas the patterns formed with high salt content (1 M) were extensively washed off the substrates. Well-defined pattern shapes of spin SA multilayers were obtained at an ionic strength of 0.4 M NaCl. Multilayer patterns prepared using spin SA and lift-off methods at the same ionic strength had a surface roughness of about 2 nm, and those prepared using the dip SA and lift-off method had a surface roughness of about 5 nm. The same process was used to prepare well-defined patterns of organic/metallic multilayer films consisting of PE and gold nanoparticles. The spin SA process yielded patterned multilayer films with various lengths and shapes.
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Affiliation(s)
- Jinhan Cho
- School of Chemical and Biological Engineering & NANO Systems Institute-National Core Research Center, Seoul National University, San 56-1, Shilim-dong, Kwanak-gu, Seoul 151-744, Korea
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29
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Panwar AS, Kumar S. Brownian dynamics simulations of polyelectrolyte adsorption in shear flow. J Chem Phys 2005; 122:154902. [PMID: 15945662 DOI: 10.1063/1.1876172] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Brownian dynamics simulations are used to study the adsorption of an isolated polyelectrolyte molecule onto an oppositely charged flat surface in the absence and the presence of an imposed shear flow. The polyelectrolyte is modeled as a freely jointed bead-rod chain where excluded volume interactions are incorporated by using a hard-sphere potential. The total charge along the backbone is distributed uniformly among all the beads, and the beads are allowed to interact with one another and the charged surface through screened Coulombic interactions. The simulations are performed by placing the molecule a fixed distance above the surface, and the adsorption behavior is then studied as a function of screening length. In the absence of an imposed flow, the chain is found to lie flat and extended on the adsorbing surface in the limit of weak screening, whereas in the limit of strong screening it desorbs from the surface and attains free-solution behavior. For intermediate screening, only a small portion of the chain adsorbs and it becomes highly extended in the direction normal to the surface. An imposed shear flow tends to orient the chain in the direction of flow and also leads to increased contact of the chain with the surface.
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Affiliation(s)
- Ajay S Panwar
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA
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Sangribsub S, Tangboriboonrat P, Pith T, Decher G. Hydrophobization of multilayered film containing layer-by-layer assembled nanoparticle by Nafion adsorption. Polym Bull (Berl) 2005. [DOI: 10.1007/s00289-005-0353-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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