A probabilistic long-term framework for site-specific erosion analysis of wind turbine blades: A case study of 31 Dutch sites

Rain-induced leading-edge erosion (LEE) of wind turbine blades (WTBs) is associated with high repair and maintenance costs. The effects of LEE can be triggered in less than 1 to 2 years for some wind turbine sites, whereas it may take several years for others. In addition, the growth of erosion may also differ for different blades and...

Delayed yielding of oil/water emulsions in presence of stabilizing biopolymer

This study investigates the stabilization of oil/water emulsions as a function of addition of a biopolymer (scleroglucan) which acts as an emulsion stabilizer. Rheological characterization in the form of controlled stress creep measurements has been carried out and it reveals the colloidal gel exhibiting a delayed yielding in a certain...

Properties and performance of spin-on-glass coatings for the corrosion protection of stainless steels in chloride media

Spin-on-glass deposition was investigated as viable alternative to increase the durability and performance of 316L steel in chloride environment. The buildup of a detrimental interface oxide was prevented by non-oxidative thermal curing of the coatings, which leads to a transformation to an inorganic, SiO₂-like material. The degree...

Metal-Organic Frameworks For Adsorption Driven Energy Transformation: From Fundamentals To Applications

A novel class of materials, i.e. Metal-Organic Frameworks (MOFs), has successfully been developed that is extremely suited for application in heat pumps and chillers. They have a superior performance over commercial sorbents and may potentially contribute to considerable energy savings worldwide. Globally about 33 % of the energy consumption is...

Stress relaxation in thermosets by photoreversible crosslink exchange

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A new class of supramolecular thermoplastic elastomers for self-healing coatings

A supramolecular material exhibiting self-healing properties was studied in this work. The material is based on the mixture of two ABA-type oligomeric triblock copolymers, the first consisting of positively charged end blocks and the second one of negatively charged ones. Each oligomeric triblock consists of a soft middle block and soft end...

Understanding the self-replenishing of hydrophobic coatings for further industrial applications

Hydrophobic materials hold many properties that are desirable in coatings, e.g. water repellency and low-adhesion are essential to achieve an easy-to-clean/ self-cleaning behavior. However, most of the coatings currently available cannot maintain their hydrophobicity upon surface damage or wear, due to the irreversible loss of the low surface...

Self-healing adhesion on polymer coatings

Supramolecular self assembling hydrogen bonded polymeric materials are of great importance due to its practical relevance. Well designed molecules based on these concepts can produce polymeric materials with “responsive” properties like self healing even in coating application. The reversible, non-covalent hydrogen bonding interactions are a...

SHE: The Flemish program on engineerd self-healing materials

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Residue-free plasma etching of polyimide coatings for small pitch vias with improved step coverage

The authors have found that patterning polyimide coatings containing organosilane adhesion promoter using pure oxygen plasma resulted in a thin silicon-rich residue layer. They show in this paper that adding small amounts of fluorine-containing gas to the etching gas mixture is necessary in order to achieve residue-free polyimide plasma etching....

Liquid crystalline thermosetting polymers as protective coatings for aerospace

Environmental regulations are driving the development of new aerospace coating systems, mainly to eliminate chromates and reduce volatile organic compound (VOC) emissions. Among the various potential options for new coating materials, liquid crystalline polymers (LCPs) are attractive due to their unique combination of mechanical properties and...

Stress gradients in CrN coatings

Stress in hard films is the net sum of tensile stress generated at the grain boundaries, compressive stress due to ion peening, and thermal stress due to the difference in thermal expansion of the coating and substrate. The tensile part due to grain boundaries is thickness dependent. The other two contributions are not thickness dependent....

A mesoscopic approach to the study of thin protective coatings by Positron Beam Analysis and Scanning Electron Microscopy

The study of thin protective coatings is one of the major research topics in the industry. Among the many questions in this wide topic, the aim of this thesis has been to contribute to the understanding of two of them: the problem of the adhesion and the role of porosity in thin films. The thin films studied in this work were mainly...

"What-if": From path dependency to path creation in a coatings chain: a methodology for strategies towards sustainable innovation

Testing of coatings and materials for jet engine components in simulated operational environments

Military aircraft flying low level missions in Western Europe encounter a very different environment from that in most of the United States. Industrial pullution causes atmospheric moisture to be highly acid, and the corrosion rate of jet engine components is greatly increased, with consequent high maintenance costs. To help combat this problem...