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Publications (10 of 23) Show all publications
Yang, H., Zaini, I. N., Pan, R., Jin, Y., Wang, Y., Li, L., . . . Han, T. (2024). Distributed electrified heating for efficient hydrogen production. Nature Communications, 15(1), Article ID 3868.
Open this publication in new window or tab >>Distributed electrified heating for efficient hydrogen production
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2024 (English)In: Nature Communications, E-ISSN 2041-1723, Vol. 15, no 1, article id 3868Article in journal (Refereed) Published
Abstract [en]

This study introduces a distributed electrified heating approach that is able to innovate chemical engineering involving endothermic reactions. It enables rapid and uniform heating of gaseous reactants, facilitating efficient conversion and high product selectivity at specific equilibrium. Demonstrated in catalyst-free CH4 pyrolysis, this approach achieves stable production of H2 (530 g h−1 L reactor−1) and carbon nanotube/fibers through 100% conversion of high-throughput CH4 at 1150 °C, surpassing the results obtained from many complex metal catalysts and high-temperature technologies. Additionally, in catalytic CH4 dry reforming, the distributed electrified heating using metallic monolith with unmodified Ni/MgO catalyst washcoat showcased excellent CH4 and CO2 conversion rates, and syngas production capacity. This innovative heating approach eliminates the need for elongated reactor tubes and external furnaces, promising an energy-concentrated and ultra-compact reactor design significantly smaller than traditional industrial systems, marking a significant advance towards more sustainable and efficient chemical engineering society.

Place, publisher, year, edition, pages
Nature Research, 2024
National Category
Energy Engineering
Identifiers
urn:nbn:se:kth:diva-346497 (URN)10.1038/s41467-024-47534-8 (DOI)38719793 (PubMedID)2-s2.0-85192354703 (Scopus ID)
Note

QC 20240517

Available from: 2024-05-16 Created: 2024-05-16 Last updated: 2024-05-17Bibliographically approved
Su, Y., Xue, H., Fu, Y., Chen, S., Li, Z., Li, L., . . . Li, J. (2024). Monolithic Fabrication of Metal‐Free On‐Paper Self‐Charging Power Systems. Advanced Functional Materials
Open this publication in new window or tab >>Monolithic Fabrication of Metal‐Free On‐Paper Self‐Charging Power Systems
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2024 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028Article in journal (Refereed) Published
Abstract [en]

Self-charging power systems (SCPSs) are envisioned as promising solutions for emerging electronics to mitigate the increasing global concern about battery waste. However, present SCPSs suffer from large form factors, unscalable fabrication, and material complexity. Herein, a type of highly stable, eco-friendly conductive inks based on poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) are developed for direct ink writing of multiple components in the SCPSs, including electrodes for miniaturized spacer-free triboelectric nanogenerators (TENGs) and microsupercapacitors (MSCs), and interconnects. The principle of “one ink, multiple functions” enables to almost fully print the entire SCPSs on the same paper substrate in a monolithic manner without post-integration. The monolithic fabrication significantly improves the upscaling capability for manufacturing and reduces the form factor of the entire SCPSs (a small footprint area of ≈2 cm × 3 cm and thickness of ≈1 mm). After pressing/releasing the TENGs for ≈79000 cycles, the 3-cell series-connected MSC array can be charged to 1.6 V while the 6-cell array to 3.0 V. On-paper SCPSs are promising to serve as lightweight, thin, sustainable, and low-cost power supplies. 

Place, publisher, year, edition, pages
Wiley, 2024
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-346177 (URN)10.1002/adfm.202313506 (DOI)001164374600001 ()2-s2.0-85185153516 (Scopus ID)
Funder
The Swedish Foundation for International Cooperation in Research and Higher Education (STINT), STINTThe Swedish Foundation for International Cooperation in Research and Higher Education (STINT), CH2017‐7284Swedish Research Council, 2019‐04731
Note

QC 20240514

Available from: 2024-05-03 Created: 2024-05-03 Last updated: 2024-05-14Bibliographically approved
Koskela, S., Wang, S., Li, L., Zha, L., Berglund, L. & Zhou, Q. (2023). An Oxidative Enzyme Boosting Mechanical and Optical Performance of Densified Wood Films. Small, 19(17), Article ID 2205056.
Open this publication in new window or tab >>An Oxidative Enzyme Boosting Mechanical and Optical Performance of Densified Wood Films
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2023 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 19, no 17, article id 2205056Article in journal (Refereed) Published
Abstract [en]

Nature has evolved elegant ways to alter the wood cell wall structure through carbohydrate-active enzymes, offering environmentally friendly solutions to tailor the microstructure of wood for high-performance materials. In this work, the cell wall structure of delignified wood is modified under mild reaction conditions using an oxidative enzyme, lytic polysaccharide monooxygenase (LPMO). LPMO oxidation results in nanofibrillation of cellulose microfibril bundles inside the wood cell wall, allowing densification of delignified wood under ambient conditions and low pressure into transparent anisotropic films. The enzymatic nanofibrillation facilitates microfibril fusion and enhances the adhesion between the adjacent wood fiber cells during densification process, thereby significantly improving the mechanical performance of the films in both longitudinal and transverse directions. These results improve the understanding of LPMO-induced microstructural changes in wood and offer an environmentally friendly alternative for harsh chemical treatments and energy-intensive densification processes thus representing a significant advance in sustainable production of high-performance wood-derived materials.

Place, publisher, year, edition, pages
Wiley, 2023
Keywords
cellulose microfibrils, densified wood, lytic polysaccharide monooxygenase, mechanical properties, wood cell walls
National Category
Wood Science Composite Science and Engineering
Identifiers
urn:nbn:se:kth:diva-330033 (URN)10.1002/smll.202205056 (DOI)000919095100001 ()36703510 (PubMedID)2-s2.0-85147307840 (Scopus ID)
Note

QC 20230627

Available from: 2023-06-27 Created: 2023-06-27 Last updated: 2023-06-27Bibliographically approved
Qin, L., Zhang, Y., Fan, Y. & Li, L. (2023). Cellulose nanofibril reinforced functional chitosan biocomposite films. Polymer testing, 120, 107964, Article ID 107964.
Open this publication in new window or tab >>Cellulose nanofibril reinforced functional chitosan biocomposite films
2023 (English)In: Polymer testing, ISSN 0142-9418, E-ISSN 1873-2348, Vol. 120, p. 107964-, article id 107964Article in journal (Refereed) Published
Abstract [en]

Recently, chitosan has become attractive due to being biodegradable, biocompatible and renewable. However, the weak mechanical properties of chitosan films limit their large-scale application. In this work, a strategy of blending TEMPO, oxidized CNF (TOCN) and chitosan was developed to fabricate nanocomposite films in order to improve the mechanical properties and maintain biocompatibility. The TOCN/chitosan nanocomposite films exhibited excellent optical transmittance (>85%) and extremely high tensile strength of 235 MPa. The good compatibility of TOCN and chitosan chains, good dispersion of chitosan aggregates and the presence of stiff TOCN crystal domains are the main reasons for getting improved mechanical strength of composite films. The films showed good biocompatible properties based on the cell activity assay results. Furthermore, they were stable in PBS buffer for more than 6 months without significant degradation. The TOCN/chitosan nanocomposite films with these excellent properties could be employed in medical applications.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
TEMPO oxidized CNF, Chitosan, Nanocomposites, Biocompatibility, Mechanical properties
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-328431 (URN)10.1016/j.polymertesting.2023.107964 (DOI)000992869700001 ()2-s2.0-85148330765 (Scopus ID)
Note

QC 20230612

Available from: 2023-06-12 Created: 2023-06-12 Last updated: 2023-06-12Bibliographically approved
Tran, V. C., Mastantuoni, G. G., Zabihipour, M., Li, L., Berglund, L., Berggren, M., . . . Engquist, I. (2023). Electrical current modulation in wood electrochemical transistor. Proceedings of the National Academy of Sciences of the United States of America, 120(118), Article ID e2218380120.
Open this publication in new window or tab >>Electrical current modulation in wood electrochemical transistor
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2023 (English)In: Proceedings of the National Academy of Sciences of the United States of America, ISSN 0027-8424, E-ISSN 1091-6490, Vol. 120, no 118, article id e2218380120Article in journal (Refereed) Published
Abstract [en]

The nature of mass transport in plants has recently inspired the development of low-cost and sustainable wood-based electronics. Herein, we report a wood electrochemical transistor (WECT) where all three electrodes are fully made of conductive wood (CW). The CW is prepared using a two-step strategy of wood delignification followed by wood amalgamation with a mixed electron-ion conducting polymer, poly(3,4-ethylenedioxythiophene)–polystyrene sulfonate (PEDOT:PSS). The modified wood has an electrical conductivity of up to 69 Sm−1 induced by the formation of PEDOT:PSS microstructures inside the wood 3D scaffold. CW is then used to fabricate the WECT, which is capable of modulating an electrical current in a porous and thick transistor channel (1 mm) with an on/off ratio of 50. The device shows a good response to gate voltage modulation and exhibits dynamic switching properties similar to those of an organic electrochemical transistor. This wood-based device and the proposed working principle demonstrate the possibility to incorporate active electronic functionality into the wood, suggesting different types of bio-based electronic devices.

Place, publisher, year, edition, pages
Proceedings of the National Academy of Sciences, 2023
Keywords
conductivity, electrochemistry, PEDOT:PSS, transistor, wood
National Category
Polymer Chemistry Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-331691 (URN)10.1073/pnas.2218380120 (DOI)001025817800003 ()37094114 (PubMedID)2-s2.0-85153687393 (Scopus ID)
Note

QC 20230713

Available from: 2023-07-13 Created: 2023-07-13 Last updated: 2023-08-15Bibliographically approved
Li, J., Li, L. & Jonsson, M. (2023). Formation and stability of studtite in bicarbonate-containing waters. Ecotoxicology and Environmental Safety, 263, Article ID 115297.
Open this publication in new window or tab >>Formation and stability of studtite in bicarbonate-containing waters
2023 (English)In: Ecotoxicology and Environmental Safety, ISSN 0147-6513, E-ISSN 1090-2414, Vol. 263, article id 115297Article in journal (Refereed) Published
Abstract [en]

Studtite and meta-studtite are the only two uranyl peroxides found in nature. Sparsely soluble studtite has been found in natural uranium deposits, on the surface of spent nuclear fuel in contact with water and on core material from major nuclear accidents such as Chernobyl. The formation of studtite on the surface of nuclear fuel can have an impact on the release of radionuclides to the biosphere. In this work, we have experimentally studied the formation of studtite as function of HCO3- concentration and pH. The results show that studtite can form at pH = 10 in solutions without added HCO3-. At pH <= 7, the precipitate was found to be mainly studtite, while at 8 = pH = 9.8, a mixture of studtite and meta-schoepite was found. Studtite formation from UO22+ and H2O2 was observed at [HCO3-] <= 2 mM and studtite was only found to dissolve at [HCO3-] > 2 mM.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Studtite, XRD, PH, gamma-radiation, Geological repository
National Category
Environmental Sciences
Identifiers
urn:nbn:se:kth:diva-335138 (URN)10.1016/j.ecoenv.2023.115297 (DOI)001049649300001 ()37494736 (PubMedID)2-s2.0-85166629672 (Scopus ID)
Note

QC 20230901

Available from: 2023-09-01 Created: 2023-09-01 Last updated: 2023-09-04Bibliographically approved
Tavares da Costa, M. V., Li, L. & Berglund, L. (2023). Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate. Materials & design, 230, Article ID 111947.
Open this publication in new window or tab >>Fracture properties of thin brittle MTM clay coating on ductile HEC polymer substrate
2023 (English)In: Materials & design, ISSN 0264-1275, E-ISSN 1873-4197, Vol. 230, article id 111947Article in journal (Refereed) Published
Abstract [en]

Thin clay coatings can be deposited from water dispersions for the purpose of improved gas barrier properties and fire retardancy of polymeric materials. Mechanical properties of the coatings are difficult to assess, since they are very thin (≈1µm). In-situ tests using a micro tensile stage in a scanning electron microscope reveal a thickness-dependent microcracking mechanism, and Weibull parameters for coating fracture are extracted. Complex fracture events are identified, related to a weak clay coating-polymer substrate interface. A micromechanical finite element formulation provides values of 5 MPa for interfacial shear strength and 1 J/m2 for interfacial fracture toughness. From the multiple cracking behavior of the clay coating, a clay strength ≈ 225 MPa is estimated by the Weibull strength parameter from fragmentation diagrams. The method may be extended to other combinations of brittle coating-ductile substrates.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Debonding, Fragmentation test, In-situ test, Interface, Microcracking, MTM tensile strength
National Category
Other Materials Engineering
Identifiers
urn:nbn:se:kth:diva-331602 (URN)10.1016/j.matdes.2023.111947 (DOI)001041789400001 ()2-s2.0-85154068691 (Scopus ID)
Note

QC 20230711

Available from: 2023-07-11 Created: 2023-07-11 Last updated: 2023-08-18Bibliographically approved
Mastantuoni, G. G., Li, L., Chen, H., Berglund, L. & Zhou, Q. (2023). High-Strength and UV-Shielding Transparent Thin Films from Hot-Pressed Sulfonated Wood. ACS Sustainable Chemistry and Engineering
Open this publication in new window or tab >>High-Strength and UV-Shielding Transparent Thin Films from Hot-Pressed Sulfonated Wood
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2023 (English)In: ACS Sustainable Chemistry and Engineering, E-ISSN 2168-0485Article in journal (Refereed) Published
Abstract [en]

Wood is a high-strength lightweight material owing to its orthotropic cellular structure and composite-like constitution. In conventional fabrication of wood-derived functional materials, the removal of the potentially beneficial components, such as lignin and hemicellulose, often leads to the disruption of the native hierarchical wood structure. Herein, we developed a facile method of in situ wood sulfonation followed by hot pressing for pine veneers to prepare high-density transparent thin films with preserved wood components and the natural fiber alignment. An optimum lignin content of the hot-pressed films was found to be 20.6% where both mechanical and optical properties were significantly enhanced with a more dense and compact structure. The hot-pressed transparent wood films also showed UV-blocking capability and could be recycled into discrete wood fibers owing to the sulfonate groups endowed by the in situ sulfonation step. The unique combination of properties achieved for thin wood films marks an important step in engineering functional wood-based materials that utilize both the structure of aligned fibers and the complex components of natural wood.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2023
National Category
Wood Science
Identifiers
urn:nbn:se:kth:diva-334224 (URN)10.1021/acssuschemeng.3c02559 (DOI)001048169200001 ()
Note

QC 20230825

Available from: 2023-08-17 Created: 2023-08-17 Last updated: 2023-08-25Bibliographically approved
Han, X., Chen, P., Li, L., Nishiyama, Y. & Yang, X. (2023). Planar and uniplanar orientation in nanocellulose films: interpretation of 2D diffraction patterns step-by-step. Cellulose, 30(13), 8151-8159
Open this publication in new window or tab >>Planar and uniplanar orientation in nanocellulose films: interpretation of 2D diffraction patterns step-by-step
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2023 (English)In: Cellulose, ISSN 0969-0239, E-ISSN 1572-882X, Vol. 30, no 13, p. 8151-8159Article in journal (Refereed) Published
Abstract [en]

X-ray diffraction (XRD) is widely used in cellulose structural characterization. The commonly used “powder” XRD assumes the sample is macroscopically isotropic. For cellulose fibrous samples, however, due to the high aspect ratio of the components, the structure is often anisotropic, and the texture affects the materials properties to a large extent. A simple setup of a point-focused X-ray beam and a two-dimensional detection of scattered X-ray is a practical tool to analyze the texture. We studied three types of cellulose nanofibril (CNF) films obtained by casting. 2,2,6,6-tetramethylpiper- idine-1-oxyl radical (TEMPO) oxidized one shows a high degree of (1–10) uniplanar orientation, whereas holocellulose CNF and enzyme-pretreated CNF showed planar orientation. In the planar orientation, the c-axis is preferentially oriented in the plane parallel to the film while within each fibril other crystallographic axis would be randomly distributed around the c-axis. Also, a clear peak can be detected at low angle corresponding to a d-spacing of 3–4 nm indicating a strong correlation perpendicular to the film at this length scale. This distance was the lowest for TEMPO-CNF and corroborates with the model of uniplanar orientation of rectangular cross-section. The numerically simulated azimuthal intensity distribution of hk0 reflections in the two types of texture agreed well with the experimental intensity distribution.

Place, publisher, year, edition, pages
Springer Nature, 2023
Keywords
nanocellulose, planar orientation, uniplanar orientation, X-ray diffraction
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-338523 (URN)10.1007/s10570-023-05411-5 (DOI)001040887700001 ()2-s2.0-85166250239 (Scopus ID)
Note

QC 20231114

Available from: 2023-11-14 Created: 2023-11-14 Last updated: 2023-11-14Bibliographically approved
Yang, X., Li, L., Nishiyama, Y., Reid, M. S. & Berglund, L. (2023). Processing strategy for reduced energy demand of nanostructured CNF/clay composites with tailored interfaces. Carbohydrate Polymers, 312, Article ID 120788.
Open this publication in new window or tab >>Processing strategy for reduced energy demand of nanostructured CNF/clay composites with tailored interfaces
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2023 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 312, article id 120788Article in journal (Refereed) Published
Abstract [en]

Nacre-mimicking nanocomposites based on colloidal cellulose nanofibrils (CNFs) and clay nanoparticles show excellent mechanical properties, yet processing typically involves preparation of two colloids followed by a mixing step, which is time- and energy-consuming. In this study, a facile preparation method using low energy kitchen blenders is reported in which CNF disintegration, clay exfoliation and mixing carried out in one step. Compared to composites made from the conventional method, the energy demand is reduced by about 97 %; the composites also show higher strength and work to fracture. Colloidal stability, CNF/clay nanostructure, and CNF/clay orientation are well characterized. The results suggest favorable effects from hemicellulose-rich, negatively charged pulp fibers and corresponding CNFs. CNF disintegration and colloidal stability are facilitated with substantial CNF/clay interfacial interaction. The results show a more sustainable and industrially relevant processing concept for strong CNF/clay nanocomposites.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
CNF, clay biocomposites, Cumulative energy demand, Fibrillation, Exfoliation, XRD
National Category
Chemical Sciences
Identifiers
urn:nbn:se:kth:diva-326051 (URN)10.1016/j.carbpol.2023.120788 (DOI)000957252800001 ()37059528 (PubMedID)2-s2.0-85150391929 (Scopus ID)
Note

QC 20230424

Available from: 2023-04-24 Created: 2023-04-24 Last updated: 2023-04-24Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-2168-4504

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