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Publications (9 of 9) Show all publications
Antonio, C., Andersson, R. ., Ström, V., Wu, Q., Sacchi, B., Farris, S., . . . Olsson, R. T. (2019). Preparation and Comparison of Reduced Graphene Oxide and Carbon Nanotubes as Fillers in Conductive Natural Rubber for Flexible Electronics. Omega, 4(2)
Open this publication in new window or tab >>Preparation and Comparison of Reduced Graphene Oxide and Carbon Nanotubes as Fillers in Conductive Natural Rubber for Flexible Electronics
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2019 (English)In: Omega, ISSN 0030-2228, E-ISSN 1541-3764, Vol. 4, no 2Article in journal (Refereed) Published
Abstract [en]

Conductive natural rubber (NR) nanocomposites were prepared by solvent-casting suspensions of reduced graphene oxide(rGO) or carbon nanotubes (CNTs), followed by vulcanization of the rubber composites. Both rGO and CNT were compatible as fillers in the NR as well as having sufficient intrinsic electrical conductivity for functional applications. Physical (thermal) and chemical reduction of GO were investigated, and the results of the reductions were monitored by X-ray photoelectron spectroscopy for establishing a reduction protocol that was useful for the rGO nanocomposite preparation. Field-emission scanning electron microscopy showed that both nanofillers were adequately dispersed in the main NR phase. The CNT composite displays a marked mechanical hysteresis and higher elongation at break, in comparison to the rGO composites for an equal fraction of the carbon phase. Moreover, the composite conductivity was always ca. 3-4 orders of magnitude higher for the CNT composite than for the rGO composites, the former reaching a maximum conductivity of ca. 10.5 S/m, which was explained by the more favorable geometry of the CNT versus the rGO sheets. For low current density applications though, both composites achieved the necessary percolation and showed the electrical conductivity needed for being applied as flexible conductors for a light-emitting diode. 

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
National Category
Natural Sciences
Identifiers
urn:nbn:se:kth:diva-246150 (URN)10.1021/acsomega.8b03630 (DOI)000460237300107 ()2-s2.0-85061903645 (Scopus ID)
Note

QC 20190318

Available from: 2019-03-14 Created: 2019-03-14 Last updated: 2019-05-22Bibliographically approved
Alander, B., Capezza, A., Wu, Q., Johansson, E., Olsson, R. T. & Hedenqvist, M. (2018). A facile way of making inexpensive rigid and soft protein biofoams with rapid liquid absorption. Industrial crops and products (Print), 119, 41-48
Open this publication in new window or tab >>A facile way of making inexpensive rigid and soft protein biofoams with rapid liquid absorption
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2018 (English)In: Industrial crops and products (Print), ISSN 0926-6690, E-ISSN 1872-633X, Vol. 119, p. 41-48Article in journal (Refereed) Published
Abstract [en]

A novel and facile method to produce inexpensive protein biofoams suitable for sponge applications is presented. The protein used in the study was wheat gluten (WG), readily available as a by/co-product, but the method is expected to work for other cross-linkable proteins. The foams were obtained by high-speed stirring of pristine WG powder in water at room temperature followed by drying. Glutaraldehyde was used to crosslink the foam material in order to stabilize the dispersion, reduce its tackiness and improve the strength of the final foam. The foams were of medium to high density and absorbed readily both hydrophobic and hydrophilic liquids. The foam structure, consisting primarily of an open pore/channel system, led to a remarkably fast capillary-driven (pore-filling only) uptake of a hydrophobic liquid (limonene). Essentially all uptake occurred within the first second (to ca. 90% of the dry weight). In a polar liquid (water), the rapid pore-filling occurred in parallel with a more time-dependent swelling of the foam matrix material. Further improvement in the foam strength was achieved by making a denser foam or adding TEMPO-oxidized cellulose nanofibres. Soft foams were obtained by adding glycerol.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Wheat gluten; Foam; TEMPO cellulose nanofibres; Plasticised; Absorption; Mechanics
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-226143 (URN)10.1016/j.indcrop.2018.03.069 (DOI)000432763800005 ()2-s2.0-85044920664 (Scopus ID)
Funder
Swedish Research Council Formas, 243-2011-1436
Note

QC 20180418

Available from: 2018-04-13 Created: 2018-04-13 Last updated: 2018-06-13Bibliographically approved
Lo Re, G., Engström, J., Wu, Q., Malmström, E., Gedde, U. W., Olsson, R. & Berglund, L. (2018). Improved Cellulose Nanofibril Dispersion in Melt-Processed Polycaprolactone Nanocomposites by a Latex-Mediated Interphase and Wet Feeding as LDPE Alternative. ACS Applied Nano Materials, 1(6), 2669-2677
Open this publication in new window or tab >>Improved Cellulose Nanofibril Dispersion in Melt-Processed Polycaprolactone Nanocomposites by a Latex-Mediated Interphase and Wet Feeding as LDPE Alternative
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2018 (English)In: ACS Applied Nano Materials, ISSN 2574-0970, Vol. 1, no 6, p. 2669-2677Article in journal (Refereed) Published
Abstract [en]

This work reports the development of a sustainable and green one-step wet-feeding method to prepare tougher and stronger nanocomposites from biodegradable cellulose nanofibrils (CNF)/polycaprolactone (PCL) constituents, compatibilized with reversible addition fragmentation chain transfer-mediated surfactant-free poly(methyl methacrylate) (PMMA) latex nanoparticles. When a PMMA latex is used, a favorable electrostatic interaction between CNF and the latex is obtained, which facilitates mixing of the constituents and hinders CNF agglomeration. The improved dispersion is manifested in significant improvement of mechanical properties compared with the reference material. The tensile tests show much higher modulus (620 MPa) and strength (23 MPa) at 10 wt % CNF content (compared to the neat PCL reference modulus of 240 and 16 MPa strength), while maintaining high level of work to fracture the matrix (7 times higher than the reference nanocomposite without the latex compatibilizer). Rheological analysis showed a strongly increased viscosity as the PMMA latex was added, that is, from a well-dispersed and strongly interacting CNF network in the PCL.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-241449 (URN)10.1021/acsanm.8b00376 (DOI)000461400700029 ()
Note

QC 20190123

Available from: 2019-01-22 Created: 2019-01-22 Last updated: 2019-04-23Bibliographically approved
Paulraj, T., Wennmalm, S., Riazanova, A. V., Wu, Q., Crespo, G. A. & Svagan, A. J. (2018). Porous Cellulose Nanofiber-Based Microcapsules for Biomolecular Sensing. ACS Applied Materials and Interfaces, 10(48), 41146-41154
Open this publication in new window or tab >>Porous Cellulose Nanofiber-Based Microcapsules for Biomolecular Sensing
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 48, p. 41146-41154Article in journal (Refereed) Published
Abstract [en]

Cellulose nanofibers (CNFs) have recently attracted a lot of attention in sensing because of their multifunctional character and properties such as renewability, nontoxicity, biodegradability, printability, and optical transparency in addition to unique physicochemical, barrier, and mechanical properties. However, the focus has exclusively been devoted toward developing two-dimensional sensing platforms in the form of nanopaper or nanocellulose-based hydrogels. To improve the flexibility and sensing performance in situ, for example, to detect biomarkers in vivo for early disease diagnostics, more advanced CNF-based structures are needed. Here, we developed porous and hollow, yet robust, CNF-based microcapsules using only the primary plant cell wall components, CNF, pectin, and xyloglucan, to assemble the capsule wall. The fluorescein isothiocyanate-labeled dextrans with M-w of 70 and 2000 kDa could enter the hollow capsules at a rate of 0.13 +/- 0.04 and 0.014 +/- 0.009 s(-1), respectively. This property is very attractive because it minimizes the influence of mass transport through the capsule wall on the response time. As a proof of concept, glucose oxidase (GOx) enzyme was loaded (and cross-linked) in the microcapsule interior with an encapsulation efficiency of 68 +/- 2%. The GOx-loaded microcapsules were immobilized on a variety of surfaces (here, inside a flow channel, on a carbon-coated sensor or a graphite rod) and glucose concentrations up to 10 mM could successfully be measured. The present concept offers new opportunities in the development of simple, more efficient, and disposable nanocellulose-based analytical devices for several sensing applications including environmental monitoring, healthcare, and diagnostics.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
Keywords
cellulose nanofibers, microcapsules, glucose oxidase, sensing, sensor, layer-by-layer
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-240733 (URN)10.1021/acsami.8b16058 (DOI)000452694100022 ()30412378 (PubMedID)2-s2.0-85057799223 (Scopus ID)
Funder
Swedish Foundation for Strategic Research , ICA14-0045Swedish Research Council, VR-2017-4887Science for Life Laboratory - a national resource center for high-throughput molecular bioscience
Note

QC 20190109

Available from: 2019-01-09 Created: 2019-01-09 Last updated: 2019-10-08Bibliographically approved
Wu, Q., Sundborg, H., Andersson, R. ., Peuvot, K., Guex, L., Nilsson, F., . . . Olsson, R. T. (2017). Conductive biofoams of wheat gluten containing carbon nanotubes, carbon black or reduced graphene oxide. RSC Advances, 7(30), 18260-18269
Open this publication in new window or tab >>Conductive biofoams of wheat gluten containing carbon nanotubes, carbon black or reduced graphene oxide
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2017 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 7, no 30, p. 18260-18269Article in journal (Refereed) Published
Abstract [en]

Conductive biofoams made from glycerol-plasticized wheat gluten (WGG) are presented as a potential substitute in electrical applications for conductive polymer foams from crude oil. The soft plasticised foams were prepared by conventional freeze-drying of wheat gluten suspensions with carbon nanotubes (CNTs), carbon black (CB) or reduced graphene oxide (rGO) as the conductive filler phase. The change in conductivity upon compression was documented and the results show not only that the CNT-filled foams show a conductivity two orders of magnitude higher than foams filled with the CB particles, but also that there is a significantly lower percolation threshold with percolation occurring already at 0.18 vol%. The rGO-filled foams gave a conductivity inferior to that obtained with the CNTs or CB particles, which is explained as being related to the sheet-like morphology of the rGO flakes. An increasing amount of conductive filler resulted in smaller pore sizes for both CNTs and CB particles due to their interference with the ice crystal formation before the lyophilization process. The conductive WGG foams with CNTs were fully elastic with up to 10% compressive strain, but with increasing compression up to 50% strain the recovery gradually decreased. The data show that the conductivity strongly depends on the type as well as the concentration of the conductive filler, and the conductivity data with different compressions applied to these biofoams are presented for the first time.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2017
Keywords
Carbon black, Carbon nanotubes, Compaction, Crude oil, Fillers, Graphene, Nanotubes, Pore size, Solvents, Yarn, Compressive strain, Conductive fillers, Conductive Polymer, Electrical applications, Orders of magnitude, Percolation thresholds, Reduced graphene oxides, Reduced graphene oxides (RGO), Foams
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-207441 (URN)10.1039/c7ra01082f (DOI)000399005500011 ()2-s2.0-85016468994 (Scopus ID)
Note

Funding details: EIT, European Institute of Innovation and Technology; Funding details: 243-2011-1436, Svenska Forskningsrådet Formas; Funding text: This work was financed by the Swedish Research Council Formas (No. 243-2011-1436). R. L. Andersson acknowledges the support from: European Institute of Innovation and Technology (EIT)-KIC InnoEnergy, Swedish Centre for Smart Grids and Energy Storage (SweGRIDS) and ABB AB.

QC 20170523

Available from: 2017-05-23 Created: 2017-05-23 Last updated: 2017-11-29Bibliographically approved
Wu, Q., Yu, S., Kollert, M., Mtimet, M., Roth, S. V., Gedde, U. W., . . . Hedenqvist, M. S. (2016). Highly Absorbing Antimicrobial Biofoams Based on Wheat Gluten and Its Biohybrids. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, 4(4), 2395-2404
Open this publication in new window or tab >>Highly Absorbing Antimicrobial Biofoams Based on Wheat Gluten and Its Biohybrids
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2016 (English)In: ACS SUSTAINABLE CHEMISTRY & ENGINEERING, ISSN 2168-0485, Vol. 4, no 4, p. 2395-2404Article in journal (Refereed) Published
Abstract [en]

This paper presents the absorption, mechanical, and antimicrobial properties of novel types of biofoams based on wheat-gluten (WG) and its biohybrids with silica. The hybrid WG foams were in situ polymerized with silica using two different silanes. When immersed in water, the 90-95% porous WG and silica-modified hybrid WG foams showed a maximum water uptake between 32 and 11 times the original sample weight. The maximum uptake was only between 4.3 and 6.7 times the initial weight in limonene (a nonpolar liquid) but showed reversible absorption/desorption and that the foams could be dried into their original shape. The different foams had a cell size of 2-400 mu m, a density of 60-163 kg/m(3), and a compression modulus of 1-9 MPa. The integrity of the foams during swelling in water was improved by cross-linking with glutaraldehyde (GA) or by a thermal treatment at 130 degrees C, which polymerized the proteins. In the never-dried state, the foam acted as a sponge, and it was possible to squeeze out water and soak it repeatedly. If the foam was dried to its glassy state, then the cells collapsed and did not open again even if the solid foam was reimmersed in water, saving as a sensor mechanism that can be used to reveal unintended exposure to polar liquids such as water under a product's service life. Small-angle X-ray scattering revealed that the gliadin-correlated structure expanded and then disappeared in the presence of water. The foam was made antimicrobial by impregnation with a Lanasol solution (a bromophenol existing in algae). It was also shown that the foam can act as a transfer/storage medium for liquids such as natural oils (rapeseed oil) and as a slow-release matrix for surfactant chemicals.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2016
Keywords
Protein, Freeze-drying, Swelling, Sponge, Lanasol
National Category
Chemical Sciences Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-185985 (URN)10.1021/acssuschemeng.6b00099 (DOI)000373554600061 ()2-s2.0-84964378085 (Scopus ID)
Note

QC 20160504

Available from: 2016-05-04 Created: 2016-04-29 Last updated: 2017-05-29Bibliographically approved
Strain, I. N., Wu, Q., Pourrahimi, A. M., Hedenqvist, M. S., Olsson, R. T. & Andersson, R. L. (2015). Electrospinning of recycled PET to generate tough mesomorphic fibre membranes for smoke filtration. Journal of Materials Chemistry A, 3(4), 1632-1640
Open this publication in new window or tab >>Electrospinning of recycled PET to generate tough mesomorphic fibre membranes for smoke filtration
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2015 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 3, no 4, p. 1632-1640Article in journal (Refereed) Published
Abstract [en]

Tough fibrous membranes for smoke filtration have been developed from recycled polyethylene terephthalate (PET) bottles by solution electrospinning. The fibre thicknesses were controlled from 0.4 to 4.3 mu m by adjustment of the spinning conditions. The highest fibre strength and toughness were obtained for fibres with an average diameter of 1.0 mu m, 62.5 MPa and 65.8 MJ m(-3), respectively. The X-ray diffraction (XRD) patterns of the fibres showed a skewed amorphous halo, whereas the differential scanning calorimetry (DSC) results revealed an apparent crystallinity of 6-8% for the 0.4 and 1 mu m fibres and 0.2% crystallinity for the 4.3 mu m fibres. Heat shrinkage experiments were conducted by exposing the fibres to a temperature above their glass transition temperature (T-g). The test revealed a remarkable capability of the thinnest fibres to shrink by 50%, which was in contrast to the 4.3 mu m fibres, which displayed only 4% shrinkage. These thinner fibres aka showed a significantly higher glass transition temperature (+15 degrees C) than that of the 4.3 mu m fibres. The results suggested an internal morphology with a high degree of molecular orientation in the amorphous segments along the thinner fibres, consistent with a constrained mesomorphic phase formed during their rapid solidification in the electric field. Air filtration was demonstrated with cigarette smoke as a model substance passed through the fibre mats. The 0.4 mu m fibres showed the most effective smoke filtration and a capacity to absorb 43x its own weight in smoke residuals. whereas the 1 mu m fibres showed the best combination of filtration capacity (32x) and mechanical robustness. The use of recycled PET in the form of nanofibres is a novel way of turning waste into higher-value products.

Keywords
Differential scanning calorimetry, Electric fields, Electrospinning, Fibrous membranes, Filtration, Glass, Glass transition, Microfiltration, Molecular orientation, Plastic bottles, Polyethylenes, Rapid solidification, Recycling, Shrinkage, Smoke, Spinning (fibers), Temperature, X ray diffraction, Average diameter, Cigarette smokes, Filtration capacity, Internal morphology, Mechanical robustness, Mesomorphic phase, Recycled polyethylene terephthalates, Spinning conditions
National Category
Materials Chemistry
Identifiers
urn:nbn:se:kth:diva-159360 (URN)10.1039/c4ta06191h (DOI)000346906100035 ()2-s2.0-84919884625 (Scopus ID)
Note

QC 20150130

Available from: 2015-01-30 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved
Wu, Q., Andersson, R. L., Holgate, T., Johansson, E., Gedde, U. W., Olsson, R. T. & Hedenqvist, M. S. (2014). Highly porous flame-retardant and sustainable biofoams based on wheat gluten and in situ polymerized silica. Journal of Materials Chemistry A, 2(48), 20996-21009
Open this publication in new window or tab >>Highly porous flame-retardant and sustainable biofoams based on wheat gluten and in situ polymerized silica
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2014 (English)In: Journal of Materials Chemistry A, ISSN 2050-7488, Vol. 2, no 48, p. 20996-21009Article in journal (Refereed) Published
Abstract [en]

This article presents a novel type of flame-retardant biohybrid foam with good insulation properties based on wheat gluten and silica, the latter polymerized in situ from hydrolysed tetraethyl orthosilicate (TEOS). This led to the formation of intimately mixed wheat gluten and silica phases, where, according to protein solubility measurements and infrared spectroscopy, the presence of silica had prohibited full aggregation of the proteins. The foams with "built-in" flame-retardant properties had thermal insulation properties similar to those of common petroleum- and mineral-based insulation materials. The foams, with a porosity of 87 to 91%, were obtained by freeze-drying the liquid mixture. Their internal structure consisted of mainly open cells between 2 and 144 mu m in diameter depending on the foam formulation, as revealed by mercury intrusion porosimetry and scanning electron microscopy. The foams prepared with >= 30% TEOS showed excellent fire-retardant properties and fulfilled the criteria of the best class according to UL94 fire testing standard. With increasing silica content, the foams became more brittle, which was prevented by cross-linking the materials (using gluteraldehyde) in combination with a vacuum treatment to remove the largest air bubbles. X-ray photoelectron and infrared spectroscopy showed that silicon was present mainly as SiO2 .

National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-158350 (URN)10.1039/c4ta04787g (DOI)000345531200073 ()2-s2.0-84911479268 (Scopus ID)
Note

QC 20150121

Available from: 2015-01-21 Created: 2015-01-07 Last updated: 2017-05-29Bibliographically approved
Strain, I. N., Wu, Q., Pourrahimi, A. M., Hedenqvist, M. S., Olsson, R. T. & Andersson, R. L. Electrospinning of recycled PET to generate strong mesomorphic fibre membranes for smoke filtration.
Open this publication in new window or tab >>Electrospinning of recycled PET to generate strong mesomorphic fibre membranes for smoke filtration
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(English)Manuscript (preprint) (Other academic)
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-156155 (URN)
Note

QS 2014

Available from: 2014-11-21 Created: 2014-11-21 Last updated: 2014-11-21Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7674-0262

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