Laboratory of Stimuli-Responsive Functional Materials & Devices

Albert Schenning

Adaptieve decoratieve en reflectieve coatings voor glas

Adaptive decorative & reflective coatings for glass

Laboratory of Stimuli-Responsive Functional Materials & Devices

Sustainable EnergySmart coatings for self-cleaning and

antifouling

Smart windowsLuminescent solar concentrators

Adv. Mater., 2018. 30, 1703713Adv. Funct. Mater., 2018, 28, 6, 1704756ACS Appl. Mater. & Inter., 2018, 10, 4168-4172

Health Personal ComfortNanoporous materials for clean

water

Optical sensors for health, food and safety

Dye solution + Adsorbent

Smart Textiles

Soft Robotics, Haptics

Adv. Funct. Mater., 2018, 28, 1707436Adv. Energy Mater., 2018, 8, 1702922Angew. Chem., Int. Ed. 2018, 57, 1030-1033

Adv. Funct. Mater., 2018, 28, 1705942Nature Comm., 2018, 9, 456ACS Appl. Mater. & Inter., 2018, 10, 30008-30013

Adaptive decorative & reflective coatings for glass

based on photonic polymers

Photonic Structures in Nature, Structural Colors

Adaptive Structural Colors in Nature

Photonic Polymers based on Cholesteric Liquid Crystals

Liquid Crystal Displays (LCDs)

P

𝜆 = 𝑛𝑃𝑐𝑜𝑠𝜃

hν Photointiator

Cholesteric Liquid Crystalline (CLC) Polymers

P

𝜆 = 𝑛𝑃𝑐𝑜𝑠𝜃

CLC or Photonic polymer

Decorative coatings for buildings?

https://www.youtube.com/watch?v=go7O1Z4eypcIridescence is the gradually change colour as the angle of view changes

Olivier T. Picot, Mian Dai, Cees W.M. Bastiaansen

Fibers woven into textile

Decorative coatings for Smart Textile?

CLC on PA6 fibers

LC ink

Different ink amount → Different color

Full color

Erase

Print

4 mm 4 mm

Signage, Billboard displays

Alternative cellulose-based paper

Print

Erase

Multiple times

Multicolor polymer coatings

40

60

80

100

T

%

Wavelength (nm)

11

Change in pitch

Adaptive Photonic Polymers

Change in color

Stimulus

𝜆 = 𝑛𝑃𝑐𝑜𝑠𝜃

0% (red), 2.6% (yellow), 7.7% (green), 13% (violet) extension and corresponding change in color

Strain responsive photonic polymer reflectors

Polyamide/Pigment bilayer film

Strain

13

75 oC

0 oC

Photonic polymer with broad glass transition Tg: 10 - 54 oC

Temperature responsive reflective coatings

Monali Moirangthem

35 oC

14

0 oC 8 oC 20 oC 25 oC 55 oC

Increasing temperature

Temperature response

35 oC

15

Intelligent packaging labels

0 oC 8 oC 20 oC 25 oC 55 oC

Decreasing temperature

Temperature response

FreshStrips provides low-cost, smart-packaging solutions that inform consumers on the safety and quality of their food products, at any time from production to consumption

https://www.freshstrips.co/

Time temperature indicators: Fresh Strips

4 oC 8 oC

Product good

Product not good

Time-temperature indicator

chemical startup of 2017

Sensors made so far:time-temp. (vaccines), calcium (osteoporosis), humidity, CO2, O2

amines (rotten fish), methanol (wine), pH, strain, UV

Kees Bastiaansen, Monali Moirangthem

MedicalFood

Battery free optical sensors, test strips

Anti refill

Printable on a foil

Humidity responsive reflective coatings (camouflage)

appears on exposure to water or by exhaling breathACS Appl. Mater. Interfaces 2018, 10, 4168−4172

Ca2+(aq)

wet

dry

O

OO

O

K+

K+

400 500 600 700 800 900 1000 1100 1200

50

55

60

65

70

75

80

85

90

95

100

Tra

nsm

issio

n (

%)

Wavelength (nm)

Coating 1, 30 0C

Coating 1, 120 0C

Coating 2,, 30 0C

Coating 2, 120 0C

Coating 3, 30 0C

Coating 3, 120 0C

24 ͦC 40 ͦC 50 ͦC

Responsive coatings that change color and topography

Stijn Kragt

IR reflectors for energy neutral buildings

In year 2100, the use of cooling device (A/C) will increase by 74%.

Green House Effect

Use of A/C increases the emission of NOx by 80 %and COx by 70%.

Fuel Economy

Simulation shows that on reducing the A/C load by 30 % the fuel consumption can be reduced by 26 %.

Energy Neutral Buildings

Energ. Policy, 2009, 37, 507-521

Source: Energy Information Administration, Major Fuel Consumption (Btu) by End Use, 2003

IR Region Solar spectrum Responsible for Heating

IR reflector that is able to reject IR light without consuming any energy and affecting light in the visible region

IR reflective polymer coatings on glass

450 600 750 900 1050 12000

20

40

60

80

100

T%

Wavelength, nm

Hitesh Khandewal, Steven de Bakker, Michael Debije

J. Mater. Chem. A, 2014, 2, 14622–14627

The transparency of the windows of building and cars causes excessive heating of interiors, requiring additional cooling, which costs energy

Electrically Switchable IR Reflectors

Hitesh Khandelwal, Michael Debije

Planar state Homeotropic state

Light Reflection Light

Transmission

Impact of Switchable IR Reflectors on Energy Savings

We have NOT considered the switching energy in these simulations!!

StIR: Static IR reflector R-IR: Electrically switchable IR reflector

Roel Loonen, Jan HensenPolyArch

Simulations

25

ConclusionsAdaptive reflective polymers

have the potential to provide solutions to many societal challenges

Acknowledgement