Atmospheric plasma technology for surface modification of nanoparticles
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1 9/16/2011 Atmospheric plasma technology for surface modification of nanoparticles Dirk Vangeneugden - COST Meeting, Espoo, Finland, 15-16/09/2011
2 Contents Introduction to VITO Developed atmospheric plasma technology Plasma treatment of micro & nano powders Conclusions 2
3 Introduction to VITO Independent public research organisation Located on four sites in Flanders, Belgium About 650 people with and overall budget of 97 MEUR Support sustainable technological development Energy Environment Industrial Innovation Confidential 2011, VITO 2011, VITO all rights reserved 3
4 Industrial Innovation Separation and conversion technologies Soil and groundwater remediation Proces streams Raw materials Material technology Processing of multifunctional materials Environmental analyses and technologies Specialized organic and anorganic laboratory Confidential 2011, VITO 2011, VITO all rights reserved 6
5 Development of atmospheric plasma technology In collaboration with
6 Concept of Aerosol Assisted Plasma Treatment Same principle as industrial corona Carrier gas N 2 (He - Ar - Air) Frequency range 1 khz 100 khz Precursor injection High voltage range 1 kv 40 kv Dissipated power W/cm 2 Aerosol particles nm Carrier Gas HV HV Ceramic Coated foil Plasma 8
7 Concentration (a.u.) Aerosol generation by pressure atomization Aerosol Dilution gas Atomisation gas bar 2,5 bar 2 bar 250 1,5 bar bar TSI Atomizer Model 3076 Aerosol diameter (nm) Aerosol is nano-sized, typical in range of nm 9
8 New plasma equipment for nano surface treatment PlasmaSpot PlasmaLine PlasmaZone 3D parts Foams Foils 10
9 Applications for nano surface engineering Long term adhesion improvement Improved adhesion for lamination, printing, gluing Better than flame or corona treatment Dry process, no use of (toxic) primers Alternative controlled release liners Solvent free process Deposition of ultra thin coatings Silicone free release liners possible Release liner Adhesive tape 11
10 Applications for nano surface engineering Low friction coatings on rubber parts Nano particles in plasma coatings Improve wear resistance in sliding applications Reduced noise and vibrations (e.g. wipers) One step process for biofunctional surfaces Immobilization of biomolecules in plasma polymers Improved uniformity of bioactivity Diagnostics, bio-sensors, intelligent packaging, 12
11 Pilot line for roll-to-roll plasma treatment 13
12 New line for R2R plasma treatment, coating and lamination Confidential 2009, VITO all rights reserved 14
13 Plasma treatment of micro/nano powders New R&D direction in VITO s atmospheric plasma team Based on existing know-how related to functionalisation and coating of flat surfaces and 3D components Addressing growing interest in customized micro/nano powders Broad application area of functionalized (nano) powders: additives in plastics, paint & coatings, composites, pigments, cosmetics, pharma, etc. 15
14 Advantages of atmospheric plasma technology Dry surface treatment versus wet chemical techniques avoiding use of solvents and adhesion primers Cold plasma surface engineering technique enabling treatment of temperature sensitive materials Versatile technique broad range of precursor chemistries Atmospheric process continuous production processes possible 16
15 Approach Project main targets To develop an innovative atmospheric plasma process for cost-effective powder functionalisation To increase the knowledge on dry functionalisation of (nano)powders Open innovation program with industrial consortium Market input from start of project Focussed knowledge build-up Fast assessment of technological potential Shortening development time from lab to industry 17
16 Targets and challenges Engineered (nano)particles higher added value Improved incorporation/dispersion in different hosts/matrices Surface functionalisation to decrease or prevent agglomeration Improved flowability of particles Super hydrophilic/hydrophobic treatment Surface modification to influence tribo-electric charging Challenges Interaction plasma-nanoparticles (agglomeration, charging etc.) Residence time of particles in plasma zone Technical reactor concept and powder handling Level of control: treatment uniformity 18
17 Current set-up for powder treatment 19
18 Available characterization tools In-house: Tensiometer XPS SEM/EDS Particle size distribution Zeta potential Specific area Other: EPMA, XRD, FT-IR, TGA,... External: TEM ToF-SIMS Flowability parameters Krüss tensiometer K100MK2 21
19 Examples of plasma treated powder PE Untreated PE N 2 -treated CB Untreated CB N 2 -treated CB Untreated CB N 2 -treated After 1h After 24h Large improvement of dispersion of PE and CB powders in water 22
20 Examples of plasma treated powder APEO coating on ZrO 2 beads 23
21 TEM images of coating» Coating is nm thick» Several patches on the particle surface 24
22 Conclusions Atmospheric plasma treatment opens new perspectives on functionalisation and coating of micro & nano powders Through collaboration in open innovation projects with industrial and R&D partners we aim to accelerate the integration into new products In collaboration with 25
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