Advanced characterization: the key factor for standardization at nm-scale. Olha Sereda
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1 Advanced characterization: the key factor for standardization at nm-scale Olha Sereda
2 about CSEM Our mission Development and transfer of microtechnologies to the industrial sector in order to reinforce its competitive advantage. Cooperation agreements with established companies Creation of start-ups Copyright 2017 CSEM Material Science & Component Reliability Page 2
3 about CSEM Technology platforms to foster innovation MEMS Surface Engineering Systems Ultra-low-power integrated systems PV-center & energy management Copyright 2017 CSEM Material Science & Component Reliability Page 3
4 Outlook Nanotechnology and why do we care about it? What are the benefits of using nanomaterials for aeronautic application? Link between standardization and characterization Example: Nanocoatings for improved anti-icing properties Copyright 2017 CSEM Material Science & Component Reliability Page 4
5 Nanotechnology Nanotechnology is the understanding and control of matter at dimensions between approximately 1 and 100 nm or nanoscale. Copyright 2017 CSEM Material Science & Component Reliability Page 5
6 Why do we care? Things behave differently at this scale: unusual physical, chemical, and biological properties can emerge in materials at the nanoscale. Quantum mechanics plays a much more important role Surface area: nanomaterials behave differently from bulk materials of the same chemical Volume: 1m x 1m x 1m = 1 m 3 Surface Area: (1m x 1m) x 6 sides = 6 m 2 Volume: (0.1m x 0.1m x 0.1m) x 1000 cubes = 1 m 3 Surface Area: (0.1m x 0.1m) x 6 sides x 1000 cubes = 60 m 2 This increased surface area allows chemical reactions to go much faster Copyright 2017 CSEM Material Science & Component Reliability Page 6
7 What are the benefits for aerospace? The drive for lighter and more efficient air vehicles has led to the rapid adoption of nanotechnology in aerospace manufacturing. Substituting stronger material of the same weight can increase the impact resistance of aircraft skin material. Visionary ideas include fault tolerant and self-healing materials The main roadblock: is caused by uncertainty over the environmental and health and safety implications of these materials. Copyright 2017 CSEM Material Science & Component Reliability Page 7
8 Link: standards & characterisations The aerospace material standards allow industry to test these materials in order to evaluate their: Structural, thermal, optical, Standards Aerospace mechanical, chemical, Nanomaterials Characterization electrical properties Copyright 2017 CSEM Material Science & Component Reliability Page 8
9 Nanotechnology in aerospace materials Nanotube-Reinforced Composites: improvement of the mechanical properties of CNTreinforced composites Nanostructured metals & nanocoatings: greater strength and hardness Polymer Nanocomposites: superb weight-to-strength ratios, and enhanced resilience to vibration, fire and EMS Copyright 2017 CSEM Material Science & Component Reliability Page 9
10 Polymer-based NanoClay Composites Conventional composite Intercalated nanocomposite Exfoliated nanocomposite Copyright 2017 CSEM Material Science & Component Reliability Page 10
11 Techniques for Particle Sizing Nano Microns source: Copyright 2017 CSEM Material Science & Component Reliability Page 11
12 Spherical Nanoparticles of 10nm (powder) Average diameter 9.8 ± 1 (nm) Copyright 2017 CSEM Material Science & Component Reliability Page 12
13 Bi- and trimodal systems Can SAXS provide information about bimodal & tri-modal particle mixtures? Copyright 2017 CSEM Material Science & Component Reliability Page 13
![Dv(R) [nm-1] Trimodal Size Distribution from](/docs-images/94/118556604/images/14-0.jpg "SAXS Data 25nm : 50nm : 80nm [ 3 : 1 : 1 ]")
14 Dv(R) [nm-1] Trimodal Size Distribution from SAXS Data 25nm : 50nm : 80nm [ 3 : 1 : 1 ] Colloidal 0.8 Vol.% % 80.00% 60.00% 40.00% 20.00% 0.00% Copyright 2017 CSEM Material Science & Component Reliability Page 14
15 Nanocoatings for improved anti-icing properties GOAL: ACHIEVE OPTIMUM AERODYNAMIC PERFORMANCE BY MEANS OF SURFACE MODIFICATION To increase safety by avoiding icing To reduce weight and lower fuel consumption by use of new generation of low-energy consuming active de-icing system To reduce pollution by reduced fuel consumption Copyright 2017 CSEM Material Science & Component Reliability Page 16
16 Anti-icing surfaces: CSEM Technologies Two biomimetic approaches Combination of surface structuration and hydrophobic chemistry Superhydrophobic/lotus effect Minimise the contact area between surface and water Delay ice crystallisation and reduce ice adhesion Grafting of freeze depressant agents Delay ice crystallisation and inhibit crystal growth Keep water liquid at the surface Copyright 2017 CSEM Material Science & Component Reliability Page 17
17 Approach #1: Structuration of polymeric coatings Selected structuration process: Replication with microstructured mould Two families of coatings have been mainly investigated Thermoset resins: structuration remains challenging UV-cureable resins: good results on PnP or commercial formulations Copyright 2017 CSEM Material Science & Component Reliability Page 18
18 : Superhydrophobic surfaces o High speed video recordings of water drops impacts on superhydrophobic surfaces: Flat Structure 1 Structure 2 Copyright 2017 CSEM Material Science & Component Reliability Page 19
19 Approach #1: Lab testing performances Long freezing delays measured with embossed pillars+f-mvd (~1 min, 10 times longer than solution fluorinated sol-gel coatings) (CSEM structures) Low shear stress obtained with MVD treated samples (< 0.02 MPa) (intrinsec roughness of commercial coatings) High power reduction achieved with MVD treated surfaces (up to 66%!), compared to commercial hydrophobic paints (anodised metallic surface) Copyright 2017 CSEM Material Science & Component Reliability Page 20
20 Approach #2: Freezing point depressant agents? Observation of polar fishes in the 60s/70s: their blood should have frozen From blood analysis: anti-freeze (glyco)proteins Mechanism: Tight binding to ice crystal and water Ice growth and freezing point reduction Possible to reproduce these effects with synthetic polymers? Copyright 2017 CSEM Material Science & Component Reliability Page 21
21 Approach #2: Wind tunnel testing CSEM technology: polymer grafting on aeronautical resin Test in Icing wind tunnel (CIRA) coupled with an electrothermal deicer Principle: decrease surface temperature up to the limit of ice-free conditions Much lower power consumption to get ice-free surfaces (heating down to 25 C only!) Copyright 2017 CSEM Material Science & Component Reliability Page 22
22 Sensitive mesoporous layers for aeronautic Pressure-Sensitive Paintings (PSP) for aero-dynamic testing in wind tunnel: mesoporous sol-gel coatings are used to measure fast pressure variations observed in an unsteady aerodynamic flow Higher sensibility when compared to standard PSP, better performances in luminescence (10x) and responsiveness (F acq. up to 10KHz vs F acq. < 1KHz for std PSP). Technology patented, will be transfered to ONERA ( ) for commercialization CCIFS Innovation Trophy awarded to CSEM Copyright 2017 CSEM Material Science & Component Reliability Page 23
23 Thank you for your attention! Follow us on
24 Nano-consumer products There are over consumer products around the world that are manufacturer - identified as nanotechnology based. Touch screens (iphone) Sunscreens Cosmetics Tennis rackets Bicycles Fabric Computer memory Also in aerospace Copyright 2017 CSEM Material Science & Component Reliability Page 25
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