Molecular Layer-by-Layer Self-Assembly of Water-Soluble Perylene Diimides through π−π and Electrostatic Interactions

Langmuir ◽  
2006 ◽  
Vol 22 (1) ◽  
pp. 26-28 ◽  
Author(s):  
Tingji Tang ◽  
Jiangqiang Qu ◽  
Klaus Müllen ◽  
Stephen E. Webber
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Molecular Layer ◽  
Water Soluble ◽  
Layer By Layer ◽  
Perylene Diimides

scholarly journals Energy Transfer in Molecular Layer-by-Layer Films of Water-Soluble Perylene Diimides

Langmuir ◽  
2007 ◽  
Vol 23 (8) ◽  
pp. 4623-4628 ◽  
Author(s):  
Tingji Tang ◽  
Andreas Herrmann ◽  
Kalina Peneva ◽  
Klaus Müllen ◽  
Stephen E. Webber
Keyword(s):  
Energy Transfer ◽  
Molecular Layer ◽  
Water Soluble ◽  
Layer By Layer ◽  
Perylene Diimides

Catalytic Oxidation of NADH on Gold Electrode Modified by Layer-by- Layer Self-Assembly of Thermostable Diaphorase and Redox Polymer

2011 ◽  
Vol 675-677 ◽  
pp. 231-234 ◽  
Author(s):  
Wen Juan Zheng ◽  
Hai Tao Zheng ◽  
Tao Sun ◽  
Pu Liu ◽  
Shinichiro Suye
Keyword(s):  
Self Assembly ◽  
Multilayer Structure ◽  
Gold Electrode ◽  
Multilayer Film ◽  
Water Soluble ◽  
Current Response ◽  
Layer By Layer ◽  
Redox Polymer ◽  
Relative Response ◽  
Reduced Nicotinamide Adenine Dinucleotide

A redox polymer, poly(ethylenimine)ferrocene (PEI-Fc) was synthesized by attaching ferrocene groups to the backbone of water soluble poly(ethylenimine), and multilayer film in nanoscale was assembled on gold electrode by alternate layer-by-layer adsorption (LBL) of the positively charged PEI-Fc and the negatively charged thermostable diaphorase (DI) from B.Stearothermophilus. The LBL process was monitored and analyzed by quartz crystal microbalance (QCM) technique, which confirmed the formation of the multilayer structure. The electrochemical oxidation of coenzyme (reduced nicotinamide adenine dinucleotide, NADH) was observed on the electrode fabricated with PEI-Fc/DI multilayer film, and the influence of layer number on current response was investigated. The modified electrode retained ca. 65% relative response after storage in buffer for two months and 50% relative response after incubation at 80 °C for 3 min, which inferred that the multilayer structure was unique stable. A NAD-dependent glucose-6-phosphate dehydrogenase (G6PDH) was also immobilized via the same LBL technique, and electrode modified with PEI-Fc/DI/G6PDH film exhibited current response to glucose-6- phosphate in the presence of free NAD+.

Rendering Rayon Fibres Antimicrobial and Thermal-Responsive via Layer-by-Layer Self-Assembly of Functional Polymers

2011 ◽  
Vol 236-238 ◽  
pp. 1103-1106 ◽  
Author(s):  
Yuan Feng Pan ◽  
Hui Ning Xiao
Keyword(s):  
Self Assembly ◽  
Guanidine Hydrochloride ◽  
Antimicrobial Property ◽  
Water Soluble ◽  
Solution Temperature ◽  
Poly Vinyl Alcohol ◽  
Layer By Layer ◽  
Anionic Polymer ◽  
Water Soluble Polymer ◽  
Lbl Assembly

A thermal-responsive polymer was prepared by partially acetalyzing poly(vinyl alcohol) (PVA). The completely reversible polymer aggregation and dissolution occur above and below a low critical solution temperature (LCST) for the aqueous solution of the modified PVA. The partially acetalized PVA (APVA) with higher molecular weight and higher degree of acetalysis exhibited a lower LCST transition and was used as an anionic polymer for polymer complexation. Water-soluble polymer, cationic polyhexamethylene guanidine hydrochloride (CPHGH) with antimicrobial property, was also prepared. In conjunction with APVA, CPHGH created the unique antimicrobial polymer multilayers on the surfaces of rayon fibres via layer by layer (LbL) assembly. AFM images revealed that the particles generated by multilayers became larger after the material was treated at 60°C; while the roughness of the surfaces was increased as the layer number increased and then decreased. Moreover, antimicrobial tests also demonstrated that the rayon fiber assembled with (CPHGH/APVA) multilayers exhibited higher antimicrobial activity against E. coli and s. aureus.

Adsoption CD34 Antibody onto the Col/Hep Coating Film on Titanium to Improve Cytocompatibility of Titanium

2008 ◽  
Vol 47-50 ◽  
pp. 1411-1414 ◽  
Author(s):  
Jia Long Chen ◽  
Quan Li Li ◽  
Jun Ying Chen ◽  
Nan Huang
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Layer By Layer ◽  
Coating Film ◽  
Test Results ◽  
Cardiovascular Devices ◽  
Assembly Technique ◽  
Confluent Cell ◽  
Good Potential ◽  
Positively Charged

This study deals with improving the cytocompatibility of titanium by a coating with heparin(hep), collagen(col) and CD34 antibody. Collagen and heparin molecules were adsorbed onto a titanium surface using a layer-by-layer (LBL) self-assembly technique. The col/hep coating were formed by alternating deposition of negatively charged heparin and positively charged collagen based on electrostatic interactions. Finally the CD34 antibody was absorbed onto the surface of col/hep coating by electrostatic interactions. The chemical composition and surface topography were investigated by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The fluorescence microscopy images proved that the CD34 antibody was existed on the surface of the col/hep coating. The SEM results and the MTT test results showed that, compared to the surface of col/hep coating and the surface of titanium, the CD34 surface had better endothelial progenitor cells (EPCs) attachment and proliferation. The EPCs on the CD34 surface displayed the morphology of flat endothelium, and a confluent cell layer after cultured for 2d. This study suggested that this method maybe have good potential for surface modification of cardiovascular devices.

scholarly journals New ternary water-soluble support from self-assembly of β-cyclodextrin-ionic liquid and an anionic polymer for a dialysis device

2021 ◽  
Author(s):  
Asmaa Bouyahya ◽  
Berthe-Sandra Sembo-Backonly ◽  
Audrey Favrelle-Huret ◽  
Sébastien Balieu ◽  
Frédéric Guillen ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Low Cost ◽  
Water Soluble ◽  
Anionic Polymer ◽  
Imidazolium Cation ◽  
Water Soluble Polymer ◽  
Styrene Sulfonate ◽  
Poly Styrene Sulfonate

Abstract We developed a new hybrid material resulting from an innovative supramolecular tripartite association between an ionic liquid covalently immobilized on primary β-cyclodextrins rim and an anionic water-soluble polymer. Two hydrophilic ternary complexes based on native and permethylated β-cyclodextrins substituted with an ionic liquid and immobilized on poly(styrene sulfonate) (CD-IL+PSS− and CD(OMe)IL+PSS−) were obtained by simple dialysis with a cyclodextrin maximal grafting rate of 25% and 20% on the polymer, respectively. These polyelectrolytes are based on electrostatic interactions between the opposite charges of the imidazolium cation of the ionic liquid and the poly(styrene sulfonate) anion. The inclusion properties of the free cavities of the cyclodextrins and the synergic effect of the polymeric matrix were studied with three reference guests such as phenolphthalein, p-nitrophenol, and 2-anilinonaphthalene-6-sulfonic acid using UV-visible, fluorescent, and NMR spectroscopies. The support has been applied successfully in dialysis device to extract and concentrated aromatic model molecule. This simple and flexible synthetic strategy opens the way to new hybrid materials useful for fast and low-cost ecofriendly extraction techniques relevant for green analytical chemistry.

scholarly journals Revisiting the Cytotoxicity of Cationic Polyelectrolytes as a Principal Component in Layer-by-Layer Assembly Fabrication

Pharmaceutics ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1230
Author(s):  
Ekaterina Naumenko ◽  
Farida Akhatova ◽  
Elvira Rozhina ◽  
Rawil Fakhrullin
Keyword(s):  
Gene Delivery ◽  
Electrostatic Interactions ◽  
Surface Engineering ◽  
Delivery Systems ◽  
In Vitro Cytotoxicity ◽  
Water Soluble ◽  
Layer By Layer ◽  
Dependent Manner ◽  
Cationic Polyelectrolytes

Polycations are an essential part of layer-by-layer (LbL)-assembled drug delivery systems, especially for gene delivery. In addition, they are used for other related applications, such as cell surface engineering. As a result, an assessment of the cytotoxicity of polycations and elucidation of the mechanisms of polycation toxicity is of paramount importance. In this study, we examined in detail the effects of a variety of water-soluble, positively charged synthetic polyelectrolytes on in vitro cytotoxicity, cell and nucleus morphology, and monolayer expansion changes. We have ranked the most popular cationic polyelectrolytes from the safest to the most toxic in relation to cell cultures. 3D cellular cluster formation was disturbed by addition of polyelectrolytes in most cases in a dose-dependent manner. Atomic force microscopy allowed us to visualize in detail the structures of the polyelectrolyte–DNA complexes formed due to electrostatic interactions. Our results indicate a relationship between the structure of the polyelectrolytes and their toxicity, which is necessary for optimization of drug and gene delivery systems.

Layer-by-layer Stacking Method for 3-D Nano Structure Fabrication Using Block Copolymer Self Assembly

2011 ◽  
Vol 1312 ◽  
Author(s):  
Shin’ichi Warisawa ◽  
Ryosuke Kanameda ◽  
Reo Kometani ◽  
Sunao Ishihara
Keyword(s):  
Self Assembly ◽  
Water Soluble ◽  
Layer By Layer ◽  
Soluble Polymer ◽  
Water Soluble Polymer ◽  
Nano Structure ◽  
Cylindrical Structures ◽  
Patterned Substrate ◽  
Layer Stacking ◽  
Self Assembled

ABSTRACTIn this paper, we present layer-by-layer stacking method to fabricate self-assembled structures of block copolymers (BCP) toward the out-of-plane direction. Layer-by-layer stacking is realized by transferring a BCP film on one substrate to another. Specifically, a water-soluble polymer film is coated on the former substrate, which is placed and fixed in contact with a target substrate. Consequently, the BCP film is released from the substrate and transferred to the target substrate when immersed in de-ionized water. In our experiment, PS-b-PMMA is used to form and transfer self-assembled structures, and polyvinyl alcohol is used as a water-soluble polymer. We prepared two kinds of target substrates; one has horizontal cylindrical structures by BCP self assembly, and the other has groove structures by EB lithography. In the case of BCP patterned substrate, BCP film with vertical cylindrical structures is transferred onto the line structures of BCP. In the case of EB lithography patterned substrate, BCP film with vertical cylindrical structures is transferred in a doubly suspended condition. Furthermore, vertical and horizontal cylindrical structures are also observed to align along the grooves.

Molecular Layer Processing of Polyaniline via the Use of Hydrogen Bonding Interactions

1994 ◽  
Vol 369 ◽  
Author(s):  
William B. Stockton ◽  
Michael F. Rubner
Keyword(s):  
Hydrogen Bonding ◽  
Molecular Layer ◽  
Multilayer Films ◽  
Water Soluble ◽  
Vinyl Pyrrolidone ◽  
Poly Vinyl Alcohol ◽  
Layer By Layer ◽  
Mixed Solution ◽  
Water Soluble Polymers ◽  
Soluble Polymers

AbstractMolecular layer-by-layer build-up on a variety of substrates is demonstrated for doped polyaniline (PAn) alternating with non-ionic water soluble polymers. The adsorption is enabled by the strong interchain interactions with PAn, such as hydrogen bonding. Multilayer build-up has been demonstrated with four distinctly different non-ionic water soluble polymers: poly(vinyl pyrrolidone) (PVP), poly(vinyl alcohol) (PVA), poly(acrylamide) (PAAm), and poly(ethylene oxide) (PEO). Thus, non-ionic water soluble polymers containing a wide variety of functional groups such as amide, hydroxyl or ether groups can be used to successfully fabricate multilayer thin films with polyaniline. FTIR spectroscopy measurements show the PAn to be hydrogen bonded in these multilayer films. Conductivities for multilayer films are on the order of 1-4 S/cm for films doped with methane sulfonic acid. Conductivities on the order of 0.1 S/cm can be achieved for a single mixed layer self-assembled from a mixed solution of PAn/PVP or PAn/PAAm.

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