Publications: Material science

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Using gelatin protein to facilitate paper thermoformability

Publication year: 2014
Authors: A. Khakalo a, I. Filpponen a, L.S. Johansson a, A. Vishtal b, A.R. Lokanathan a,O. J. Rojas a,c, J. Laine a
Published in: Reactive & Functional Polymers, 2014
One of the main challenges of fiber-based packaging materials is the relatively poor elongation of cellulose under stress, which limits formability and molding in related products. [...]

Biodegradable Polyurethane Carrying Antifoulants for Inhibition of Marine Biofouling

Publication year: 2014
Authors: Jielin Ma †, Chunfeng Ma *†, Yun Yang †, Wentao Xu †, and Guangzhao Zhang *†‡
Published in: Industrial & Engineering Chemistry Research, 2014, 53 (32), p. 12753–12759
Biodegradable polyurethane with N-(2,4,6-trichlorophenyl)maleimide (TCPM) pendant groups has been prepared via a combination of a thiol–ene click reaction and a condensation reaction. [...]

Tuning Cellulose Nanocrystal Gelation with Polysaccharides and Surfactants

Publication year: 2014
Authors: Zhen Hu, Emily D. Cranston, Robin Ng, and Robert Pelton*
Published in: Langmuir, 2014, 30 (10), pp 2684–2692
Gelation of cellulose nanocrystal (CNC) dispersions was measured as a function of the presence of four nonionic polysaccharides. Addition of hydroxyethyl cellulose (HEC), hydroxypropyl guar (HPG), or locust bean gum (LBG) to CNC dispersions [...]

Surface modification of cellulose nanocrystals with cetyltrimethylammonium bromide

Publication year: 2014
Authors: Tiffany Abitbol, Heera Marway and, Emily D. Cranston Tiffany Abitbol (tiffany.abitbol@mail.mcgill.ca), Heera Marway (marwayhs@mcmaster.ca), Emily D. Cranston (ecranst@mcmaster.ca)
Published in: Special Issue: NANOCELLULOSE; Nordic Pulp & Paper Research Journal Vol 29 no (1) 2014
Cellulose nanocrystals (CNCs) prepared by sulfuric acid hydrolysis of cotton were surface modified with cetyltrimethylammonium bromide (CTAB). Essentially, the counterions of the CNC surface sulfate ester groups are exchanged for cetyltrimethyl-ammonium (CTA+), which acts as a bulky, amphiphilic cation. [...]

Photoresponsive cellulose fibers by surface modification with multifunctional cellulose derivatives

Publication year: 2014
Authors: Olga Grigoray (a), Holger Wondraczek(a), Elina Heikkilä(a), Pedro Fardim (a,b,∗), Thomas Heinze (a,c)
Published in: Carbohydrate Polymers 111 (2014) 280–287
Eucalyptus bleached kraft pulp fibers were modified by adsorption of novel bio-based multifunctionalcellulose derivatives in order to generate light responsive surfaces. [...]

Modification of Cellulose Nanofibrils with Luminescent Carbon Dots

Publication year: 2014
Authors: Junkka K. 1, Guo J. 1, Filpponen I. 1, Lainen J. 1, Rojas O.J. 1,2
Published in: Biomacromolecules, 2014, Vol. 15 (3), p. 876–881
Films and hydrogels consisting of cellulose nanofibrils (CNF) were modified by covalent EDC/NHS coupling of luminescent, water-dispersible carbon dots (CDs). [...]

Modification of surfaces with adsorption of amphiphilic polymers

Publication year: 2014
Authors: Katri Kontturi
Published in: Doctoral Dissertation
In this work the adsorption of amphiphilic polymers and their utilization in the modification of planar surfaces were examined. The approach was to systematically explore adsorption of very different types of [...]

Marine Biofouling Resistance of Polyurethane with Biodegradation and Hydrolyzation

Publication year: 2014
Authors: Wentao Xu,† Chunfeng Ma,*,† Jielin Ma,† Tiansheng Gan,† and Guangzhao Zhang*,†,‡
Published in: ACS Applied Materials & Interfaces, 2014
We have prepared polyurethane with poly(ε-caprolactone) (PCL) as the segments of the main chain and poly(triisopropylsilyl acrylate) (PTIPSA) as the side chains by a combination of radical polymerization and a condensation reaction. [...]

Specific water uptake of thin films from nanofibrillar cellulose

Publication year: 2013
Authors: Katri S. Kontturi (a), Eero Kontturi (a), Janne Laine (a)
Published in: J.Mater. Chem. A, 2013
Swelling of NFC films was surveyed by quartz crystal microbalance with dissipation monitoring coupled with H2O/D2O exchange and surface plasmon resonance. The influence of charged groups on swelling was investigated by neutralizing the charge of NFC with cationic polyelectrolytes or increasing the charge with carboxymethyl cellulose (CMC). [...]

Grafting from Poly(3,4-ethylenedioxythiophene): A Simple Route to Versatile Electrically Addressable Surfaces

Publication year: 2013
Authors: Jenny Malmström *†‡, Michel K Nieuwoudt †, Lisa T Strover †‡, Alissa Hackett †, Olivia Laita †, Margaret A Brimble †, David E Williams †‡, and Jadranka Travas-Sejdic *†‡
Published in: Macromolecules, 2013, 46 (12), pp 4955–4965
We demonstrate a simple route to versatile electrically addressable conductive polymer graft copolymer systems. [...]

Hybrid POSS-Containing Brush on Gold Surfaces for Protein Resistance

Publication year: 2013
Authors: Xiaolu Ye (a), Junbo Gong (b), Zhongping Wang (b), Zengming Zhang (b), Sheng Han (c), Xuesong Jiang (a)*
Published in: Macromol. Biosci. 2013, 13, 921–926
A hybrid polymer brush containing poly(ethylene glycol) (PEG) chains and polyhedraloligosilsesquioxane (POSS) on a gold surface is presented that exhibits an excellent protein resistance and long-term stability. [...]

Characterizing Ultrathin and Thick Organic Layers by Surface Plasmon Resonance Three-Wavelength and Waveguide Mode Analysis

Publication year: 2013
Authors: Niko Granqvist †, Huamin Liang †, Terhi Laurila †, Janusz Sadowski ‡, Marjo Yliperttula †, and Tapani Viitala *†
Published in: Langmuir, 29 (27), pp 8561–8571
A three-wavelength angular-scanning surface plasmon resonance based analysis has been utilized for characterizing optical properties of organic nanometer-thick layers with a wide range of thicknesses. [...]

Water-Wettable Polypropylene Fibers by Facile Surface Treatment Based on Soy Proteins

Publication year: 2013
Authors: Salas C. 1,3, Genzer J. 2, Lucia L.A 1, Hubbe A.M. 1, Rojas O.J. 1,2, 4
Published in: ACS Applied Materials & Interfaces, 2013, Vol. 5, p. 6541 − 6548
Modification of the wetting behavior of hydrophobic surfaces is essential in a variety of materials, including textiles and membranes that require control of fluid interactions, adhesion, transport processes, sensing, etc. This investigation examines the enhancement of wettability of animportant class of textile materials, viz., polypropylene (PP) fibers, by surface adsorption of different proteins from soybeans, including soyflour, isolate, glycinin, and β-conglycinin. [...]

Self-assembly of pyridine-modified lipoic Acid derivatives on gold and their interaction with thyroxine (t4)

Publication year: 2013
Authors: Albers WM, Milani R, Tappura K, Munter T, Resnati G, Metrangolo P.
Published in: International Journal of Molecular Sciences, 2013 Feb 6;14(2):3500-13.
Pyridyl derivatives of lipoic acid were prepared as ligands for the study of the interaction with thyroxine (T4). Thin self-assembled films of the ligands were prepared in 70% ethanol on gold and their interaction with T4 was studied by titration experiments in an aqueous buffer solution using Surface Plasmon Resonance (SPR). [...]

Adsorption of PEO-PPO-PEO Triblock Copolymers with End-Capped Cationic Chains of Poly(2-dimethylaminoethyl methacrylate)

Publication year: 2011
Authors: Xiaomeng Liu†, Arja-Helena Vesterinen§, Jan Genzer‡, Jukka V. Seppälä§, and Orlando J. Rojas*†∥
Published in: Langmuir, 2011, Vol. 27 (16), p. 9769–9780
We study the adsorption of a symmetric triblockcopolymer of ethylene oxide, EO, and propylene oxide, PO,end-capped with quarternized poly(2-dimethylaminoethylmethacrylate), DMAEMA (DMAEMA24EO132PO50EO132DMAEMA24). Light scattering and tensiometry are used tomeasure the relative size of the associated structures and surfaceexcess at the airliquid interface. [...]

Adsorption of a Nonionic Symmetric Triblock Copolymer on Surfaces with Different Hydrophobicity

Publication year: 2010
Authors: Xiaomeng Liu†, Dong Wu‡, Salomon Turgman-Cohen§, Jan Genzer§, Thomas W. Theyson∥ and Orlando J. Rojas*†⊥∥
Published in: Langmuir 2010, 26(12), 9565–9574
This study investigates the adsorption of a symmetric triblock nonionic polymer comprising ethylene oxide (EO) and propylene oxide (PO) blocks (Pluronic P-105, EO37PO56EO37) on a range of substrates including hydrophobic, i.e., polypropylene (PP), poly(ethylene terephthalate) (PET), nylon, and graphite, and hydrophilic, i.e., cellulose and silica.[...]

Measurement of phthalocyanine binding kinetics with surface plasmon resonance method

Publication year: 2010
Authors: M. Karjalainen, V. Chukharev, N.V. Tkachenko, J. Lekkala
Published in: Poster, presented at Annual Meeting of European Optical Society EOS. October 26 -29, 2010, Paris, France
Phthalocyanine molecules are potential candidates for the structural elements of optoelectronic devices such as organic solar cells and chemical sensors. The binding self-assembling monolayers of phthalocyanine molecules to a gold surface was studied using surface plasmon resonance (SPR) method. [...]

Surface plasmon resonance instrument as a refractometer for liquids and ultrathin films

Publication year: 2010
Authors: H.Liang a,b, H.Miranto b,c, N.Granqvist b,d, J.W. Sadowski c, T.Viitala b, B.Wang a, M.Yliperttula b
Published in: Sensors and Actuators B: Chemical 2010, 149(1), 212-220
A surface plasmon resonance (SPR) setup in Kretschmann configuration is being utilized as a refractometer for both liquids as well as ultrathin films. The SPR signal detection technology used is based on a goniometer approach providing a wide angular scan range which facilitates highly accurate liquid and gas phase measurements. [...]

Photo-Electroactive Organic Nanosystems

Authors: V. Chukharev, N. Tkatchenko, J. Lekkala
Published in: Poster: Department of Chemistry and Bioengineering and Department of Automation Science and Engineering,Tampere University of Technology, Finland; Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow
Project was focused on testing photo-electroactive molecules for solar and sensor technologies. Phthatalyanines, porphyrins and other organic molecules where characterized with Surface Plasmon Resonance (SPR), Atomic Force Microscope (AFM), and X-ray crystallography. [...]