Nanoencapsulation for Energy Storage and Controlled Release Prof. Dmitry Shchukin www.liv.ac.uk/stephensoninstitute.

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Presentation transcript:

Nanoencapsulation for Energy Storage and Controlled Release Prof. Dmitry Shchukin

Advances of PCM nano (micro) encapsulation 1. Confinement of the liquid phase during the S-L transition and vice-versa – particular important for crystallohydrates. 3. Heat transfer improvement via increasing the surface/area ratio (for capsules with heat-transfer elements in the shell). 2. Prevent degradation of the PCMs in contact with the outside environment. 5. Flexibility of incorporation of PCM capsules in the application devices. 4. Supercooling problems in inorganic PCMs are neglected after encapsulation.

Research lines 1.Encapsulation of n-alkanes (organic PCMs). 2. Encapsulation of Salt Hydrates (inorganic PCMs). 3.Development of hybrid systems based on: PCM-GO(graphene oxide)-CNTs microcapsules.

1. Organic n-alkanes as mPCMs Selected n-docosane (C22) as PCM T m = 44 °C ΔH m = 249 kJ/kg Thermo-regulating paints, coatings Building components, solar cell components Thermo-responsive textiles Polyurethane (PU) was chosen as a shell A template (Silicone oil) was used to optimize synthesis conditions for the encapsulation of organic PCMs (n-alkanes) Synthesis Methodology P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2015, 21, Emulsion Powder

1. Organic n-alkanes as mPCMs 10/20/20 10/5/5 10/10/10 15/15/15 10/15/15 SEM images 50 % Silicone oil- 50 % PCM DSC No latent heat when using silicone oil as a core template SEM images Latent heat obtained when introducing 50 % of PCM as a core DSC P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2015, 21, Docosane/PEG/isocyanate

P. Felix De Castro and D. G. Shchuking. Chem. Eur. J. 2015, 21, Organic n-alkanes as mPCMs 100 % n-docosane as PCM P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2015, 21, DSC (Heat flow) Shift of T m and T c and latent heat decreased of when encapsulating docosane PUshell/n-docosane (4 ± 1 µm) 1 µm 100 nm

100 % n-docosane as PCM 1. Organic n-alkanes as mPCMs P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2015, 21, TGA Thermally stable up to 220 °C PUshell/n-docosane (4 ± 1 µm) 1 µm 100 nm

Different microcapsule size at different rpm 1. Organic n-alkanes as mPCMs P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2016, 22, ± 2 µm 4 ± 1 µm 2 ± 0.2 µm from SEM images 1 µm10 µm1 µm rpm 1 µm 10 µm rpm 10 µm1 µm 6000 rpm

1. Organic n-alkanes as mPCMs P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2016, 22, µm 4 µm 2 µm PUshell docosane DSC (Heat properties) 10 µm 4 µm 2 µm PUshell docosane XRD Confinement effect on heat properties and cristallinity

1. Organic n-alkanes as mPCMs P. Felix De Castro and D. G. Shchukin. Chem. Eur. J. 2016, 22, Samples exposed to 100 heating/cooling cycles Cycling stabilityShell thickness SEM, FIB-SEM images of artificially broken microcapsules and TEM images Reproducible phase change transition over 100 cycles nm thickness shell 1 µm 0.5 µm

1. Organic n-alkanes as mPCMs Collaboration Project with University of Georgia (USA), Prof. Sergiy Minko Capsules coated on the surface of textile with NFC SEM images 10 µm 100 µm 1 µm Incorporation of mPCMs into textiles by Nanofibrillated Cellulose (NFC) coating

2. Encapsulation salt hydrates M. Graham and D. Shchukin submitted to JACS. AB + H 2 O (anhydrous salt) AB. m H 2 O + n-m H 2 O (lower hydrated salt) AB. n (H 2 O) melts T Degradation occurs after a few cycles No degradation of the salt ECAshell/Mg(NO 3 ) 2.6H 2 O 1 µm 10 µm Mg(NO 3 ) 2.6H 2 O Bulk crystallohydrates

3. Hybrid systems: PCM-GO-CNTs n-hexadecane (C16) n-octadecane (C18) n-eicosane (C20) It was extended to other PCM alkanes based: PCM-GO-CNTs microcapsules for 2D Joule Heating Devices Z. Zheng, J. Jin, J. Zou, U. Wais, A. Beckett, T. Heil, S. Higgins, L. Guan, Y. Wang and D. Shchukin. ACS Nano, , melted PCM Ultrasound-induced Emulsification Hybridization pulsed tip sonication CNTs Fabrication of PCM-GO-CNTs microcapsules GO-CNTs hybrids 1 µm PCM(docosane)-GO-CNT microcapsules (1.3 ± 0.3 µm) 1 µm GO sheets

3. Hybrid systems: PCM-GO-CNTs Z. Zheng, J. Jin, J. Zou, U. Wais, A. Beckett, T. Heil, S. Higgins, L. Guan, Y. Wang and D. Shchukin. ACS Nano, , DSC (Heat properties) Stability improvement by encapsulationTGA-Thermal stability PCM(docosane)-GO PCM(docosane)-GO-CNT PCM(docosane) after 30 min at 50 °CRoom temp.

3. Hybrid systems: PCM-GO-CNTs Fabrication of 2D Joule Heating devices  PCM-GO-CNT/GO Thermal enhancement properties vaccum filtration of PCM-GO-CNTs + GO Tailored shape thickness Z. Zheng, J. Jin, J. Zou, U. Wais, A. Beckett, T. Heil, S. Higgins, L. Guan, Y. Wang and D. Shchukin. ACS Nano, , D Joule heating device shows electrical and flexibility properties 10µm 1 µm 1 cycle consists on: Power input applied to device: ondevice heats up (T recorded) Power input switch off device cools down (T recorded) 2D Joule Heating devices made of PCM-GO-CNTs/GO Reduced GO (conventional device) Measured over 100 cycles for: 10 °C thermal enhancement

Acknowledgments University of Liverpool Prof. Dmitry Shchukin Dr. Zhaoliang Zheng Dr. Paula Felix de Castro Dr. Elena Shchukina University of Georgia Prof. Segiy Minko Dr. Yunsang Kim Funding ENERCAPSULE ERC InnovateUK NanoBarrier Byefouling Sono Engineering Marios Michailidis Xiaolei Zhu Lorena Martin Claudia Gatti Michael Graham Max Planck Institute of Colloids and Interfaces Prof. Helmuth Mohwald Dr. Dmitry Grigoriev

Thank you very much for your attention