Electrostatic Layer-by-Layer Self-Assembly of Poly(carboxybetaine)s:  Role of Zwitterions in Film Growth

2007 ◽  
Vol 40 (10) ◽  
pp. 3663-3668 ◽  
Author(s):  
Eugenia Kharlampieva ◽  
Vladimir A. Izumrudov ◽  
Svetlana A. Sukhishvili
Keyword(s):  
Self Assembly ◽  
Film Growth ◽  
Layer By Layer

Investigating Zigzag Film Growth Behaviors in Layer-by-Layer Self-Assembly of Small Molecules through a High-Gravity Technique

2015 ◽  
Vol 7 (33) ◽  
pp. 18824-18831 ◽  
Author(s):  
Mengjiao Cheng ◽  
Chao Jiang ◽  
Caijun Luo ◽  
Yajun Zhang ◽  
Feng Shi
Keyword(s):  
Small Molecules ◽  
Self Assembly ◽  
Film Growth ◽  
High Gravity ◽  
Layer By Layer

Self-Assembly of Alkali Lignin in Tetrahydrofuran

2012 ◽  
Vol 550-553 ◽  
pp. 57-61
Author(s):  
Hao Li ◽  
Yong Hong Deng ◽  
Kai Huang
Keyword(s):  
Charge Transfer ◽  
Electrostatic Interaction ◽  
Self Assembly ◽  
The Self ◽  
Charge Transfer Complexes ◽  
Layer By Layer ◽  
Alkali Lignin ◽  
Higher Temperature ◽  
Effects Of Temperature

Alkali lignin (AL) was used as a polyanion to form layer-by-layer self-assembled film with PDAC as a polycation. The effects of temperature and concentration on the adsorption characteristics of AL were investigated. Iodine was added into AL solutions to study the role of π-π interaction in self-assembly of AL and PDAC. Results show that the self-assembly of AL/PDAC is mainly driven by π-π interaction and electrostatic interaction. A higher temperature or a larger concentration can enhance the aggregation of lignin. I2 can form lignin–iodine charge–transfer complexes with AL to reduce the degree of aggregation of AL, so the adsorbed amount of AL decreases significantly with increasing iodine contents.

scholarly journals The Role of Physisorption and Chemisorption in the Oscillatory Adsorption of Organosilanes on Aluminium Oxide

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 410 ◽  
Author(s):  
Ruby Sims ◽  
Sarah Harmer ◽  
Jamie Quinton
Keyword(s):  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Film Growth ◽  
Aluminium Oxide ◽  
Time Dependent ◽  
Chemical Binding ◽  
X Ray ◽  
Assembly Mechanism ◽  
Film Substrate

The effect of physisorbed and chemisorbed species on the time-dependent self-assembly mechanism of organosilane films has been investigated on aluminium oxide using X-ray Photoelectron Spectroscopy. The role of physisorbed species was determined through their removal using a simple rinsing procedure while monitoring film substrate coverage. Removing physisorbed species from Propyldimethylmethoxysilane films, shown to follow a Langmuir-type adsorption profile, reduces the substrate coverage initially but quickly results in coverages equivalent to films that did not undergo a rinsing procedure. This indicates that all Propyldimethylmethoxysilane molecules are covalently bound to the substrate following 15 s of film growth. Removing physisorbed species from films, which have been shown to follow an oscillatory adsorption profile, Propyltrimethoxysilane and Propylmethyldimethoxysilane, reveal the persistence of these oscillations despite a reduction in silane substrate coverage. These results not only confirm the presence of two thermodynamically favourable phases in the condensation equilibrium reaction as physisorbed and chemisorbed species, but also indicate that the desorption of species during film growth involves both states of chemical binding.

scholarly journals Multilayer Self-Assemblies as Electronic and Optical Materials

1997 ◽  
Vol 488 ◽  
Author(s):  
DeQuan Li ◽  
M. Lütt ◽  
Xiaobo Shi ◽  
M. R. Fitzsimmons
Keyword(s):  
Thin Film ◽  
Self Assembly ◽  
Film Growth ◽  
Building Blocks ◽  
Layer Growth ◽  
The Self ◽  
Growth Surface ◽  
Layer By Layer ◽  
Self Assembled ◽  
Average Electron

AbstractThe layer-by-layer growth of film structures consisting of sequential depositions of oppositely charged polymers and macrocycles (ring-shaped molecules) have been constructed using molecular self-assembly techniques. These self-assembled thin films were characterized with X-ray reflectometry, which yielded (1) the average electron density, (2) the average thicknesses, and (3) the roughness of the growth surface of the self-assembled multilayer of macrocycles and polymers. These observations suggest that inorganic-organic interactions play an important role during the initial stages of thin-film growth, but less so as the thin film becomes thicker. Optical absorption techniques were also used to characterize the self-assembled multilayers. Phorphyrin and phthalocyanine derivatives were chosen as the building blocks of the self-assembled multilayers because of their interesting optical properties.

Novel Fluorescent Labels Prepared by Layer-by-Layer Assembly on Colloids for Biodetection Systems

2001 ◽  
Vol 667 ◽  
Author(s):  
Wenjun Yang ◽  
Dieter Trau ◽  
Reinhard Renneberg ◽  
Nai-Teng Yu ◽  
Frank Caruso
Keyword(s):  
Fluorescence Intensity ◽  
Immunoglobulin G ◽  
Self Assembly ◽  
Film Growth ◽  
Layer By Layer ◽  
Microscopic Image ◽  
Assembly Method ◽  
Polyelectrolyte Layer ◽  
Polystyrene Microparticles ◽  
Layer Assembly

ABSTRACTFluorescent polystyrene microparticles with different sizes were produced by the consecutive assembly of fluorescently labeled polyelectrolytes using the layer-by-layer self-assembly method. Film growth was characterized by microelectrophoresis and fluorescence microscopic image (FMI) analysis. Alternating negative and positive ζ-potentials with deposition of each successive polyelectrolyte layer demonstrated that the alternate adsorption of polyelectrolytes was achieved. FMI analysis provided direct measurement of the fluorescence intensity of single microparticles. The subsequent deposition of a protein (immunoglobulin G, IgG) layer onto the fluorescent microparticles was confirmed by a sandwich immunoassay.

Investigation of TiO2Thin Film Growth by Layer-by-Layer Self-Assembly for Application to Optical Devices

2010 ◽  
Vol 49 (4) ◽  
pp. 045001 ◽  
Author(s):  
Kyu-Hong Kyung ◽  
Kouji Fujimoto ◽  
Seimei Shiratori ◽  
Jin-Ho Kim ◽  
Sae-Hoon Kim
Keyword(s):  
Self Assembly ◽  
Film Growth ◽  
Optical Devices ◽  
Layer By Layer

scholarly journals SMALL PARTICLES WITH LARGE PERSPECTIVES: III. HOW TO COMBINE?

2008 ◽  
Vol 5 (2) ◽  
pp. 38-46
Author(s):  
Olga V. Sergeyeva
Keyword(s):  
Template Synthesis ◽  
Self Assembly ◽  
Layer By Layer ◽  
Living Matter ◽  
Small Particles ◽  
Primitive Form ◽  
Inorganic Systems ◽  
Atomic Force ◽  
Layer Assembly

The closing article of the series is concerned with the problems of the creation of nanostructures with more or less sophisticated architecture. If the nanoparticles themselves are mainly of academic inter-est, their assemblies can be used as the working elements of future devices. Such assemblies perform completely new and unexpected properties, which can not be treated as the simple sum of the their con-stituent particles. Nanoparticles can be organized into the assembly by various ways – by means of elec-trostatic, capillary, Van-der-Vaalce and other interactions. Of the special interest is the self-assembly, being known as an attribute of the living matter, but possible in the more primitive form in the inorganic systems, as it is demonstrated with the examples of chemical assemblage and template synthesis. The role of the biomolecules and effects of biospecific recognition in the nanostructures formation is discussed, as well as the possibilities to arrange nanoparticles in the desired order using the atomic-force microscopes. Key words: nanoparticles, nanostructures, self-assembly, colloidal crystals, layer –by-layer assembly, template synthesis, biomolecules.

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