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ICS Develops Ultrathin Coatings Made Through Simultaneous Spraying of Interacting Substances

Published on 2010-11-25. Author : SpecialChem

Teams from the Institut Charles Sadron CNRS, in collaboration with researchers from the Laboratory of Biomaterials and Tissue Engineering ( Inserm / University of Strasbourg), have managed to improve and expand their technical deposit "layer by layer." This synergy has led to the scientific development of a wide range of nano-coatings to new and varied applications that are sure to attract industry. Their work is published online on the site of the journal Angewandte Chemie International Edition.

Many objects of everydaylife like contact lenses, cars, non-stick pans or stickers use specific functional coatings. There are more than fifteen years, Gero Decher1 invented an original method of deposition of nanomaterials in the form of thin layers. The principle of this technique is simply to "stack" with nanometer precision, layers whose structure and chemical functionalities are controlled by the sequence and nature of the components incorporated into the film (polymers, pigments, proteins, particles, ... ). This method "layer by layer" enables the manufacture of materials with widely varying properties. Inexpensive and low emissions, this process appears in the top ten most important results of the last ten years in the field of chemistry.

Preparation of Hybrid Optical Quality Spray
(L to R) Preparation of hybrid optical quality spray simultaneously.
Schematic (top) and image (bottom) of a "multi-alive" (with film containing layers of cells)
obtained by combining the alternating spray (polymer layers red and blue)
and simultaneous spraying ( yellow layers containing the cells).

Spray-on nanoscale coatings are formed by simultaneous spraying of complementary species (e.g., polyanion/polycation, polyelectrolyte/small oligomeric ion, two inorganic salt solutions) against a receiving surface. The process leads to the formation of ultrathin films, the thicknesses of which are controlled by the spraying time. This general one-step coating method results in optically homogeneous films from a broad choice of functional compounds.

Recently, teams of chemists and physical chemists led by Gero Decher and Pierre Schaaf of the Institut Charles Sadron CNRS, in collaboration with the Jean-Claude Voegel, Laboratory of Biomaterials and Tissue Engineering (Inserm / University of Strasbourg) come to make this deposit method even more powerful and easy to apply. Initially, the technique requires successive dipping in various liquids and times of large deposits. Today, thanks to two spray bottles, scientists are able to simultaneously spray two liquids on a surface to be coated. The time savings and logistical advantages are considerable.

Better still, this new method applies to a wide range of nano-coatings, including entirely new classes of materials such as films purely inorganic. Thus, the already large range of applications of these thin films has grown. The nano-coatings obtained by these different methods of filing have applications in materials science: LEDs, fuel cells, solar cells, coatings, flexible displays, membrane separation, etc. Moreover, the introduction in these films of biologically active molecules (peptides, enzymes, drugs, proteins, DNA, cells, etc.) Leads to nano-coatings have many applications in the field of life sciences: biocompatibility of implants, preparation of dressings, tissue engineering, gene transfection, drug delivery, biosensors, etc. These are all applications of interest to industrialists seeking to reduce their production costs, to invest in sustainable development of their products and expand their product ranges. Ultimately, this innovative method for nano-assembly allows to consider the preparation of a large number of (bio)-materials or products still exist.

About ICS

Institut Charles Sadron is a laboratory of the CNRS, associated with the University of Strasbourg, which was established in 1954 to assist in basic research development of the nascent polymer industry.

Source: ICS

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