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Salatto D, Koga YT, Bajaj Y, Huang Z, Yavitt BM, Meng Y, Carrillo JMY, Sumpter BG, Nykypanchuk D, Taniguchi T, Endoh MK, Koga T. Generalized Protein-Repellent Properties of Ultrathin Homopolymer Films. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Daniel Salatto
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yuto T. Koga
- Department of Food Science, College of Agriculture and Life Sciences, Cornell University, Ithaca, New York 14853, United States
| | - Yashasvi Bajaj
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Zhixing Huang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Benjamin M. Yavitt
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Yizhi Meng
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Jan-Michael Y. Carrillo
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Center for Nanophase Materials Sciences and Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Dmytro Nykypanchuk
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
| | - Takashi Taniguchi
- Graduate School of Engineering, Department of Chemical Engineering, Kyoto University, Katsura-Campus, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Maya K. Endoh
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
| | - Tadanori Koga
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, New York 11794-2275, United States
- Department of Chemistry, Stony Brook University, Stony Brook, New York 11794-3400, United States
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Guo C, Cui W, Wang X, Lu X, Zhang L, Li X, Li W, Zhang W, Chen J. Poly-l-lysine/Sodium Alginate Coating Loading Nanosilver for Improving the Antibacterial Effect and Inducing Mineralization of Dental Implants. ACS OMEGA 2020; 5:10562-10571. [PMID: 32426614 PMCID: PMC7227044 DOI: 10.1021/acsomega.0c00986] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Accepted: 04/23/2020] [Indexed: 05/04/2023]
Abstract
In recent years, antibacterial surface modification of titanium (Ti) implants has been widely studied in preventing implant-associated infection for dental and orthopedic applications. The purpose of this study was to prepare a composite coating on a porous titanium surface for infection prevention and inducing mineralization, which was initialized by deposition of a poly-l-lysine (PLL)/sodium alginate(SA)/PLL self-assembled coating, followed by dopamine deposition, and finally in situ reduction of silver nanoparticles (AgNPs) by dopamine. The surface zeta potential, SEM, XPS, UV-vis, and water contact angle analyses demonstrate that each coating was successfully prepared after the respective steps and that the average sizes of AgNPs were 20-30 nm. The composite coating maintained Ag+ release for more than 27 days in PBS and induced mineralization when incubated in SBF. The antibacterial results showed that the composite coating inhibited/killed bacteria on the material surface and killed bacteria around them. In addition, although this coating inhibited the initial adhesion of osteoblasts, the mineralized surface greatly enhanced the cytocompatibility. Thus, we concluded that the composite coating could prevent bacterial infections and facilitate mineralization in vivo in the early postoperative period, and then, the mineralized surface could enhance the cytocompatibility.
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Yousefpour A, Amjad-Iranagh S, Goharpey F, Modarress H. Effect of drug amlodipine on the charged lipid bilayer cell membranes DMPS and DMPS + DMPC: a molecular dynamics simulation study. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2018; 47:939-950. [PMID: 29971510 DOI: 10.1007/s00249-018-1317-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2018] [Revised: 05/19/2018] [Accepted: 06/26/2018] [Indexed: 01/03/2023]
Abstract
In this work, the effects of the anti-hypertensive drug amlodipine in native and PEGylated forms on the malfunctioning of negatively charged lipid bilayer cell membranes constructed from DMPS or DMPS + DMPC were studied by molecular dynamics simulation. The obtained results indicate that amlodipine alone aggregates and as a result its diffusion into the membrane is retarded. In addition, due to their large size aggregates of the drug can damage the cell, rupturing the cell membrane. It is shown that PEGylation of amlodipine prevents this aggregation and facilitates its diffusion into the lipid membrane. The interaction of the drug with negatively charged membranes in the presence of an aqueous solution of NaCl, as the medium, is investigated and its effects on the membrane are considered by evaluating the structural properties of the membrane such as area per lipid, thickness, lipid chain order and electrostatic potential difference between bulk solution and lipid bilayer surface. The effect of these parameters on the diffusion of the drug into the cell is critically examined and discussed.
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Affiliation(s)
- Abbas Yousefpour
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, P.O. Box 15875-4413, Iran
| | - Sepideh Amjad-Iranagh
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, P.O. Box 15875-4413, Iran
| | - Fatemeh Goharpey
- Department of Polymer Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran
| | - Hamid Modarress
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), 424 Hafez Ave, Tehran, P.O. Box 15875-4413, Iran.
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Zhang L, Zhu L, Larson SR, Zhao Y, Wang X. Layer-by-layer assembly of nanorods on a microsphere via electrostatic interactions. SOFT MATTER 2018; 14:4541-4550. [PMID: 29749415 DOI: 10.1039/c8sm00062j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Combining coarse-grained molecular dynamics simulations and experiments, a systematic study on both the dynamics and equilibrium behavior of the layer-by-layer (LbL) assembly of charged nanorods (NRs) onto a charged microsphere (MS) via electrostatic interactions has been carried out. The adsorption of the first layer of NRs on the MS follows a growth-saturation dynamics. The adsorption rate is governed by a diffusion limited process when the NR concentration (CNR) is low, while the rate is independent of CNR when CNR is high. The equilibrium NR coverage on the microsphere is found to follow a Langmuir adsorption model. For multilayer LbL assembly, when CNR is low, the number (N) of NRs adsorbed onto the MS follows a linear relationship with the number of dips M; while when CNR is high, in each dip the MS surface is fully covered with NRs, and the N follows a quadratic relationship with M. Most simulation results have been confirmed by experiments using α-Fe2O3 NRs and magnetic microspheres modified by poly(diallyldimethylammonium chloride) and poly(styrenesulfonate, sodium salt). These findings provide useful guidelines for designing complex superparticles via charged building nanoblocks based on electrostatic interactions, and therefore open up a novel avenue to exploit the capability of self-assembled charged nanostructures for potential applications such as surface modifications, sensors, drug delivery vehicles, etc.
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Affiliation(s)
- Liuyang Zhang
- State Key Laboratory for Manufacturing Systems Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China
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Rathee VS, Zervoudakis AJ, Sidky H, Sikora BJ, Whitmer JK. Weak polyelectrolyte complexation driven by associative charging. J Chem Phys 2018; 148:114901. [DOI: 10.1063/1.5017941] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Vikramjit S. Rathee
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Aristotle J. Zervoudakis
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Hythem Sidky
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Benjamin J. Sikora
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
| | - Jonathan K. Whitmer
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, USA
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Lee H. Effects of temperature, salt concentration, and the protonation state on the dynamics and hydrogen-bond interactions of polyelectrolyte multilayers on lipid membranes. Phys Chem Chem Phys 2016; 18:6691-700. [PMID: 26871977 DOI: 10.1039/c5cp08039h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Polyelectrolyte multilayers, which consist of poly-l-lysines (PLL) and hyaluronic acids (HA), are simulated on phospholipid membranes with explicit water at different temperatures, salt concentrations, and protonation states of PLL that correspond to pH 7 or higher. PLL and HA polymers, which are initially sequentially deposited as three HA/PLL bilayers above the membrane, partially intermix with each other within 300 ns, and with a significant amount of water at almost half of its bulk density. With reduced protonation of amine groups of PLL, the polymers diffuse faster, especially at higher temperatures, and for 0%-protonation, disperse into the water, due to the many fewer hydrogen bonds between PLL and HA polymers. When PLL is protonated, the addition of salt ions weakens electrostatic interactions between PLL and HA and, at 0.5 M NaCl, eventually reduces the number of hydrogen bonds, which in experiments leads to hole formation inside the PLL/HA film. Multilayers are stabilized by hydrogen bonds, primarily between charged groups and to a lesser extent between uncharged groups. PLL and HA also electrostatically interact with lipid head groups of membranes which reduces the lateral mobility of membrane lipids, to an extent dependent on the salt concentration. These findings help quantitate the effects of temperature, salt, and the protonation state (or pH) on the stability and dynamics of multilayers and membranes, and show trends that compare favorably with the experimental observations of the swelling of multilayers.
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Affiliation(s)
- Hwankyu Lee
- Department of Chemical Engineering, Dankook University, Yongin, 448-701, South Korea.
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Krismastuti FSH, Bayat H, Voelcker NH, Schönherr H. Real time monitoring of layer-by-layer polyelectrolyte deposition and bacterial enzyme detection in nanoporous anodized aluminum oxide. Anal Chem 2015; 87:3856-63. [PMID: 25739712 DOI: 10.1021/ac504626m] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Porous anodized aluminum oxide (pAAO) is a nanostructured material, which due to its optical properties lends itself to the design of optical biosensors where interactions in the pores of this material are transduced into interferometric reflectance shifts. In this study, a pAAO-based biosensor was developed as a biosensing platform to detect proteinase K, an enzyme which is a readily available model system for the proteinase produced by Pseudomonas aeruginosa. The pAAO pore walls are decorated by means of the layer-by-layer (LbL) deposition technique using poly(sodium-4-styrenesulfonate) and poly-l-lysine as negatively and positively charged polyelectrolytes, respectively. Interferometric reflectance spectroscopy utilized to observe the optical properties of pAAO during LbL deposition shows that the deposition of the polyelectrolyte onto the pore walls increases the net refractive index, thus red-shifting the effective optical thickness (EOT). Upon incubation with proteinase K, a conspicuous blue shift of the EOT is observed, which is attributed to the destabilization of the LbL film upon enzymatic degradation of the poly-l-lysine components. This result is confirmed by scanning electron microscopy results. Finally, as a proof-of-principle, we demonstrate the ability of the label-free pAAO-based biosensing platform to detect the presence of the proteinase K in human wound fluid, highlighting the potential for detection of bacterial infections in chronic wounds.
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Affiliation(s)
- Fransiska Sri Herwahyu Krismastuti
- †ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia.,‡Wound Management Innovation Cooperative Research Centre, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia
| | - Haider Bayat
- §Physical Chemistry I, Department of Chemistry and Biology, University of SiegenAdolf-Reichwein-Str. 2, 57076 Siegen, Germany
| | - Nicolas H Voelcker
- †ARC Centre of Excellence in Convergent Bio-Nano Science and Technology, Mawson Institute, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia.,‡Wound Management Innovation Cooperative Research Centre, University of South Australia, Mawson Lakes, Adelaide, South Australia 5095, Australia
| | - Holger Schönherr
- §Physical Chemistry I, Department of Chemistry and Biology, University of SiegenAdolf-Reichwein-Str. 2, 57076 Siegen, Germany
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de Grooth J, Oborný R, Potreck J, Nijmeijer K, de Vos WM. The role of ionic strength and odd–even effects on the properties of polyelectrolyte multilayer nanofiltration membranes. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2014.10.044] [Citation(s) in RCA: 113] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Sada T, Fujigaya T, Nakashima N. Layer-by-layer Assembly of Trivalent Metal Cation and Anionic Polymer in Nanoporous Anodic Aluminum Oxide with 35 nm Pore. CHEM LETT 2014. [DOI: 10.1246/cl.140489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Takao Sada
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
| | - Tsuyohiko Fujigaya
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University
| | - Naotoshi Nakashima
- Department of Applied Chemistry, Graduate School of Engineering, Kyushu University
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University
- JST-CREST
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11
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Borges J, Mano JF. Molecular Interactions Driving the Layer-by-Layer Assembly of Multilayers. Chem Rev 2014; 114:8883-942. [DOI: 10.1021/cr400531v] [Citation(s) in RCA: 609] [Impact Index Per Article: 60.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- João Borges
- 3B’s
Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra,
S. Cláudio do Barco 4806-909 Caldas das Taipas, Guimarães, Portugal
- ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - João F. Mano
- 3B’s
Research Group—Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, Zona Industrial da Gandra,
S. Cláudio do Barco 4806-909 Caldas das Taipas, Guimarães, Portugal
- ICVS/3B’s
− PT Government Associate Laboratory, Braga/Guimarães, Portugal
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Escobar-Ferrand L, Li D, Lee D, Durning CJ. All-nanoparticle layer-by-layer surface modification of micro- and ultrafiltration membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:5545-5556. [PMID: 24568094 DOI: 10.1021/la5002489] [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
Layer-by-layer (LbL) deposition using primarily inorganic silica nanoparticles is employed for surface modification of polymeric micro- and ultrafiltration (MF/UF) membranes to produce novel thin film composite (TFC) membranes intended for nanofiltration (NF) and reverse osmosis (RO) applications. A wide variety of porous substrate membranes with different surface characteristics are successfully employed. This report gives detailed results for polycarbonate track etched (PCTE), polyethersulfone (PES), and sulfonated PES (SPEES) MF/UF substrates. Both spherical (cationic/anionic) and eccentric elongated (anionic) silica nanoparticles are deposited using conditions similar to those in prior works for solid substrates (e.g., Lee et al.). Appropriate selection of the pH for anionic and cationic particle deposition enables construction of nanoparticle-only layers 100-1200 nm in thickness atop the original porous membrane substrates. The surface layer thickness appears to vary linearly with the number of bilayers deposited, i.e., with the number of anionic/cationic deposition cycles. The deposition process is optimized to eliminate drying-induced cracking and improve mechanical durability via thickness control and postdeposition hydrothermal treatment. "Dead-end" permeation tests using dextran standards reveal the hydraulic characteristics and separations capability for the PCTE-based TFC membranes. The results show that nanoparticle-based LbL surface modification of MF and UF rated media can produce TFC membranes with NF capabilities.
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Affiliation(s)
- Luis Escobar-Ferrand
- Department of Chemical Engineering, Columbia University , New York, New York 10027, United States
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Henry C, Minier JP, Lefèvre G. Towards a description of particulate fouling: from single particle deposition to clogging. Adv Colloid Interface Sci 2012; 185-186:34-76. [PMID: 23141134 DOI: 10.1016/j.cis.2012.10.001] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 09/19/2012] [Accepted: 10/02/2012] [Indexed: 10/27/2022]
Abstract
Particulate fouling generally arises from the continuous deposition of colloidal particles on initially clean surfaces, a process which can even lead to a complete blockage of the fluid cross-section. In the present paper, the initial stages of the fouling process (which include single-particle deposition and reentrainment) are first addressed and current modelling state-of-the-art for particle-turbulence and particle-wall interactions is presented. Then, attention is specifically focused on the later stages (which include multilayer formation, clogging and blockage). A detailed review of experimental works brings out the essential mechanisms occurring during these later stages: as for the initial stages, it is found that clogging results from the competition between particle-fluid, particle-surface and particle-particle interactions. Numerical models that have been proposed to reproduce the later stages of fouling are then assessed and a new Lagrangian stochastic approach to clogging in industrial cases is detailed. These models further confirm that, depending on hydrodynamical conditions (the flow velocity), fluid characteristics (such as the ionic strength) as well as particle and substrate properties (such as zeta potentials), particle deposition can lead to the formation of either a single monolayer or multilayers. The present paper outlines also future numerical developments and experimental works that are needed to complete our understanding of the later stages of the fouling process.
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Lazzara TD, Lau KHA, Knoll W, Janshoff A, Steinem C. Macromolecular shape and interactions in layer-by-layer assemblies within cylindrical nanopores. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2012; 3:475-484. [PMID: 23019541 PMCID: PMC3458591 DOI: 10.3762/bjnano.3.54] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Accepted: 06/15/2012] [Indexed: 06/01/2023]
Abstract
Layer-by-layer (LbL) deposition of polyelectrolytes and proteins within the cylindrical nanopores of anodic aluminum oxide (AAO) membranes was studied by optical waveguide spectroscopy (OWS). AAO has aligned cylindrical, nonintersecting pores with a defined pore diameter d(0) and functions as a planar optical waveguide so as to monitor, in situ, the LbL process by OWS. The LbL deposition of globular proteins, i.e., avidin and biotinylated bovine serum albumin was compared with that of linear polyelectrolytes (linear-PEs), both species being of similar molecular weight. LbL deposition within the cylindrical AAO geometry for different pore diameters (d(0) = 25-80 nm) for the various macromolecular species, showed that the multilayer film growth was inhibited at different maximum numbers of LbL steps (n(max)). The value of n(max) was greatest for linear-PEs, while proteins had a lower value. The cylindrical pore geometry imposes a physical limit to LbL growth such that n(max) is strongly dependent on the overall internal structure of the LbL film. For all macromolecular species, deposition was inhibited in native AAO, having pores of d(0) = 25-30 nm. Both, OWS and scanning electron microscopy showed that LbL growth in larger AAO pores (d(0) > 25-30 nm) became inhibited when approaching a pore diameter of d(eff,n_max) = 25-35 nm, a similar size to that of native AAO pores, with d(0) = 25-30 nm. For a reasonable estimation of d(eff,n_max), the actual volume occupied by a macromolecular assembly must be taken into consideration. The results clearly show that electrostatic LbL allowed for compact macromolecular layers, whereas proteins formed loosely packed multilayers.
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Affiliation(s)
- Thomas D Lazzara
- Institute of Organic and Biomolecular Chemistry, Tammannstr. 2, 37077 Göttingen, Germany
| | - K H Aaron Lau
- Department of Biomedical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, IL 60202, USA
| | - Wolfgang Knoll
- Austrian Institute of Technology, Donau City Str. 1, 1220 Vienna, Austria
| | - Andreas Janshoff
- Institute of Physical Chemistry, Tammannstr. 6, 37077 Göttingen, Germany
| | - Claudia Steinem
- Institute of Organic and Biomolecular Chemistry, Tammannstr. 2, 37077 Göttingen, Germany
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Wang H, Ishihara S, Ariga K, Yamauchi Y. All-Metal Layer-by-Layer Films: Bimetallic Alternate Layers with Accessible Mesopores for Enhanced Electrocatalysis. J Am Chem Soc 2012; 134:10819-21. [DOI: 10.1021/ja303773z] [Citation(s) in RCA: 146] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Hongjing Wang
- World Premier International
(WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1
Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555,
Japan
| | - Shinsuke Ishihara
- World Premier International
(WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1
Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Katsuhiko Ariga
- World Premier International
(WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1
Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Precursory Research
for Embryonic
Science and Technology (PRESTO) and Core Research for Evolutional
Science and Technology (CREST), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012,
Japan
| | - Yusuke Yamauchi
- World Premier International
(WPI) Research Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1
Namiki, Tsukuba, Ibaraki 305-0044, Japan
- Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555,
Japan
- Precursory Research
for Embryonic
Science and Technology (PRESTO) and Core Research for Evolutional
Science and Technology (CREST), Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012,
Japan
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16
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Ferreira Q, Ribeiro PA, Oliveira ON, Raposo M. Long-term stability at high temperatures for birefringence in PAZO/PAH layer-by-layer films. ACS APPLIED MATERIALS & INTERFACES 2012; 4:1470-1477. [PMID: 22335565 DOI: 10.1021/am201722x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Optical memories with long-term stability at high temperatures have long been pursued in azopolymers with photoinduced birefringence. In this study, we show that the residual birefringence in layer-by-layer (LbL) films made with poly[1-[4-(3-carboxy-4 hydroxyphenylazo)benzene sulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) alternated with poly(allylamine hydrochloride) (PAH) can be tuned by varying the extent of electrostatic interactions with film fabrication at different pHs for PAH. The dynamics of both writing and relaxation processes could be explained with a two-stage mechanism involving the orientation of the chromophores per se and the chain movement. Upon calculating the activation energies for these processes, we demonstrate semiquantitatively that reduced electrostatic interactions in films prepared at higher pH, for which PAH is less charged, are responsible for the longer stability at high temperatures. This is attributed to orientation of PAZO chromophores via cooperative aggregation, where the presence of counterions hindered relaxation.
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Affiliation(s)
- Quirina Ferreira
- CEFITEC, Departamento de Física, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa (FCT/UNL), 2829-516 Caparica, Portugal
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Czajkowsky DM, Li L, Sun J, Hu J, Shao Z. Heteroepitaxial streptavidin nanocrystals reveal critical role of proton "fingers" and subsurface atoms in determining adsorbed protein orientation. ACS NANO 2012; 6:190-198. [PMID: 22148246 DOI: 10.1021/nn203356p] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Characterization of noncovalent interactions between nanometer-sized structures, such as proteins, and solid surfaces is a subject of intense interest of late owing to the rapid development of numerous solid materials for medical and technological applications. Yet the rational design of these surfaces to promote the adsorption of specific nanoscale complexes is hindered by a lack of an understanding of the noncovalent interactions between nanostructures and solid surfaces. Here we take advantage of the unexpected observation of two-dimensional nanocrystals of streptavidin on muscovite mica to provide details of the streptavidin-mica interface. Analysis of atomic force microscopic images together with structural modeling identifies six positively charged residues whose terminal amine locations match the positions of the single atom-sized anionic cavities in the basal mica surface to within 1 Å. Moreover, we find that the streptavidin crystallites are oriented only along a single direction on this surface and not in either of three different directions as they must be if the protein interacted solely with the 3-fold symmetric basal surface atoms. Hence, this broken symmetry indicates that the terminal amine protons must also interact directly with the subsurface hydroxide atoms that line the bottom of these anionic cavities and generate only a single axis of symmetry. Thus, in total, these results reveal that subsurface atoms can have a significant influence on protein adsorption and orientation and identify the insertion of proton "fingers" as a means by which proteins may generally interact with solid surfaces.
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Affiliation(s)
- Daniel M Czajkowsky
- Laboratory of Physical Biology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
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Carrillo JMY, Dobrynin AV. Layer-by-layer assembly of polyelectrolyte chains and nanoparticles on nanoporous substrates: molecular dynamics simulations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1531-1538. [PMID: 22149466 DOI: 10.1021/la203940w] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We performed molecular dynamics simulations of a multilayered assembly of oppositely charged polyelectrolyte chains and nanoparticles on porous substrates with cylindrical pores. The film was constructed by the sequential adsorption of oppositely charged species in a layer-by-layer fashion from dilute solutions. The multilayer assembly proceeds through surface overcharging after the completion of each deposition step. The substrate overcharging fraction fluctuates around 0.5 for nanoparticle-polyelectrolyte systems and around 0.4 for polyelectrolyte-polyelectrolyte systems. The surface coverage increases linearly with the number of deposition steps. The rate of surface coverage increases as a function of the number of deposition step changes when the pore is blocked. The closing of the pore occurs from the pore entrance for nanoparticle-polyelectrolyte systems. In the case of polyelectrolyte-polyelectrolyte systems, the pore plug is formed inside the pore and then spreads toward the pore ends.
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Affiliation(s)
- Jan-Michael Y Carrillo
- Polymer Program, Institute of Materials Science and Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA
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DeRocher JP, Mao P, Kim JY, Han J, Rubner MF, Cohen RE. Layer-by-layer deposition of all-nanoparticle multilayers in confined geometries. ACS APPLIED MATERIALS & INTERFACES 2012; 4:391-6. [PMID: 22181001 DOI: 10.1021/am2014647] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Nanofluidic arrays containing high-aspect-ratio nanochannels were used as a platform for the deposition of all nanoparticle multilayers. LbL assembly of 6 nm titania and 15 nm silica nanoparticles resulted in conformal multilayers of uniform thickness throughout the nanochannels. These multilayers are inherently nanoporous with void volume fractions of about 0.5. Compared to unconfined assembly of the same materials on flat substrates, thinner multilayer films were observed for the case of deposition within confined channel geometries because of surface charge-induced electrostatic depletion of the depositing species. Additionally, systematic and reproducible bridging of the nanochannels occurred as multilayer assembly progressed, a phenomenon not seen in our earlier work involving polyelectrolytes. This behavior was attributed to relatively weak nanoparticle adsorption and the resulting formation of large aggregates. These results demonstrate a new route by which confined geometries can be coated and even bridged with a nanoporous multilayer without the need for calcination or other postassembly steps to introduce porosity into the conformal coating.
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Affiliation(s)
- Jonathan P DeRocher
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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Azzaroni O, Lau KA. Layer-by-Layer Assemblies in Nanoporous Templates: Nano-Organized Design and Applications of Soft Nanotechnology. SOFT MATTER 2011; 7:8709-8724. [PMID: 22216060 PMCID: PMC3247160 DOI: 10.1039/c1sm05561e] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
The synergistic combination of layer-by-layer (LbL) assembly and nanoporous membrane templating has greatly facilitated the creation of complex and functional nanotubular structures. The approach takes advantage of both the new properties conferred by assembling diverse LbL building blocks and the tight dimensional control offered by nanotemplating to enable new functionalities that arise from the highly anisotropic "one-dimensional" LbL-nanotube format. In this review, we aim to convey the key developments and provide a current snap-shot of such templated LbL nanoarchitectures. We survey recent developments that have enabled the assembly of polymers, biomolecules and inorganic nanoparticles "à la carte", via electrostatic, covalent and specific (bio)recognition interactions. We also discuss the emerging mechanistic understanding of the LbL assembly process within the nanopore environment. Finally, we present a diverse range of LbL nanotube "devices" to illustrate the versatility of the nanotemplated LbL toolbox for generating functional soft nanotechnology.
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Affiliation(s)
- Omar Azzaroni
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA) – Departamento de Química – Facultad de Ciencias Exactas – Universidad Nacional de La Plata – CONICET – CC 16 Suc.4 (1900) La Plata – Argentina
| | - K.H. Aaron Lau
- Biomedical Engineering Department, Chemistry of Life Processes Institute, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208 - USA
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