1. FLEXIBILITY OF CELLULOSE NANOCRYSTAL NETWORKS IN RESPONSE TO WATER VAPOR
ELINA NIINIVAARA1, MARCO FAUSTINI2, TEKLA TAMMELIN3, HEIKE M.A. EHMANN4, STEFAN SPIRK4 AND EERO KONTTURI1
1 DEPARTMENT OF FOREST PRODUCTS TECHNOLOGY, SCHOOL OF CHEMICAL TECHNOLOGY, AALTO UNIVERSITY, FINLAND
2 UNIVERSITÉ PIERRE ET MARIE CURIE, LABORATORIE CHIMIE DE LA MATIERE CONDENSÉE – COLLÈGE DE FRANCE, FRANCE
3 VTT – TECHNICAL RESEARCH CENTER OF FINLAND, HIGH PERFORMANCE FIBRE PRODUCTS, FINLAND
4 INSTITUTE FOR CHEMISTRY AND TECHNOLOGY, GRAZ UNIVERSITY OF TECHNOLOGY, AUSTRIA

2. OBJECTIVES
Water vapor makes up approximately 2 – 3 % of the Earths atmosphere and as such its interactions with surfaces is of importance.
COST ACTION FP1105 SAN SEBASTIAN 26TH MAY 2015

3. OBJECTIVES
Water vapor makes up approximately 2 – 3 % of the Earths atmosphere and as such its interactions with surfaces is of importance.
Water vapor adsorption also important in various applications:
Packaging
materials
Pharmaceuticals
Corrosion research
Moisture sensors
COST ACTION FP1105 SAN SEBASTIAN 26TH MAY 2015

4. OBJECTIVES
IN THIS STUDY THE WATER VAPOR SORPTION BEHAVIOR OF CNC ULTRATHIN FILMS WAS STUDIED USING SPECTROSCOPIC ENVIRONMENTAL ELLIPSOMETRIC POROSIMETRY AND A QUARTZ CRYSTAL MICROBALANCE WITH DISSIPATION MONITORING.
COST ACTION FP1105 SAN SEBASTIAN 26TH MAY 2015

5. HIGHLIGHTS
HYDRATION OF CNC NETWORK OCCURS AROUND THE CRYSTALS NOT AS WATER CONDENSATION IN THE VOIDS BETWEEN CRYSTALS
THICKNESS OF CNC FILM
THICKNESS OF CNC FILM AND ADSORBED WATER VAPOR
WATER VAPOR ADSOPRTION
COST ACTION FP1105 SAN SEBASTIAN 26TH MAY 2015

6. HIGHLIGHTS
THREE MOLECULAR LAYERS OF WATER ENVELOPE EACH CNC IN THE NETWORK.
7 nm
FRONT VIEW
7 nm
140 nm
7 nm + (3 + 3) MONOLAYERS OF WATER, 9 nm
FRONT VIEW
140 nm
9 nm
CNC HYDRATION
COST ACTION FP1105 SAN SEBASTIAN 26TH MAY 2015

7. THANK YOU FUNDING Aalto University Academy of Finland WoodWisdom – Net (Tunable Films project)