Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 100) Show all publications
Mushi, N. E., Nishino, T., Berglund, L. A. & Zhou, Q. (2019). Strong and Tough Chitin Film from alpha-Chitin Nanofibers Prepared by High Pressure Homogenization and Chitosan Addition. ACS Sustainable Chemistry and Engineering, 7(1), 1692-1697
Open this publication in new window or tab >>Strong and Tough Chitin Film from alpha-Chitin Nanofibers Prepared by High Pressure Homogenization and Chitosan Addition
2019 (English)In: ACS Sustainable Chemistry and Engineering, ISSN 2168-0485, Vol. 7, no 1, p. 1692-1697Article in journal (Refereed) Published
Abstract [en]

Chitin nanofibers are an interesting biological nanomaterial for advanced applications, for example, in medicine, electronics, packaging and water purification. The challenge is to separate chitin nanofibers from protein in the exoskeleton structure of arthropods and avoid nanofibril aggregation to realize the mechanical potential of chitin. In this work, we developed a new method for the preparation of chitin nanofibers from lobster shell exoskeleton using 10 wt % chitosan as a sacrificial polymer. The addition of chitosan in the raw chitin colloidal suspension during high pressure homogenization process at pH 3 significantly reduced the agglomeration of chitin nanofibers as revealed by dynamic light scattering and transmission electron microscopy. Chitin film prepared from the chitin nanofiber suspension by vacuum filtration exhibited a true nanofibrils network structure without fibril aggregations as characterized by scanning electron microscopy. The presence of chitosan not only improves the colloidal stability of chitin nanofibers suspension but also facilitates the formation of chitin nanofiber network structure in the film as indicated by wide-angle X-ray diffraction analysis. The chitin nanofiber film with 4 +/- 1 wt % residual chitosan showed high tensile strength (187.2 +/- 5.6 MPa) and high work of fracture (12.1 +/- 0.4 MJ/m(3)), much higher than those chitin and chitosan films reported previously in the literature.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019
Keywords
Chitin nanofibers, Chitin film, Chitosan, Mechanical, Nanostructure
National Category
Polymer Technologies
Identifiers
urn:nbn:se:kth:diva-242987 (URN)10.1021/acssuschemeng.8b05452 (DOI)000455288800179 ()2-s2.0-85059435797 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Note

QC 20190205

Available from: 2019-02-05 Created: 2019-02-05 Last updated: 2019-02-05Bibliographically approved
Butchosa, N., Leijon, F., Bulone, V. & Zhou, Q. (2019). Stronger cellulose microfibril network structure through the expression of cellulose-binding modules in plant primary cell walls. Cellulose (London), 26(5), 3083-3094
Open this publication in new window or tab >>Stronger cellulose microfibril network structure through the expression of cellulose-binding modules in plant primary cell walls
2019 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 26, no 5, p. 3083-3094Article in journal (Refereed) Published
Abstract [en]

Cellulose-binding modules (CBMs) are non-catalytic domains typically occurring in glycoside hydrolases. Their specific interaction with diverse polysaccharides assists hydrolysis by the catalytic subunits. In this work, we have exploited the interactions between a CBM from family 3 (CBM3) and cell wall polysaccharides to alter the structure and mechanical properties of cellulose microfibrils from BY-2 tobacco cell suspension cultures. A CBM3 from Clostridium thermocellum was overexpressed in the cells using Agrobacterium-mediated transformation. Water suspensions of cellulose microfibrils were prepared by the removal of the non-cellulosic components of the primary cell walls, followed by mild disintegration using sonication. The morphology of the microfibrils was characterized by transmission electron microscopy and atomic force microscopy. These cellulose microfibrils were further hydrolyzed with 64wt% sulfuric acid to produce cellulose nanocrystals (CNCs). The average length of CNCs prepared from the CBM3-transformed cells was 201nm, higher than that from the wild-type cells (122nm). In addition, the mechanical properties and deformation mechanism of nanopapers prepared from suspensions of cellulose microfibrils were investigated. The nanopapers obtained from the CBM3-transformed cells exhibited enhanced tensile strength and work of fracture, 40% and 128% higher than those prepared from wild-type tobacco cells, respectively. [GRAPHICS] .

Place, publisher, year, edition, pages
SPRINGER, 2019
Keywords
Plant primary cell walls, Cellulose-binding modules, Cellulose microfibrils, Cellulose nanocrystals, Mechanical properties
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-251227 (URN)10.1007/s10570-019-02285-4 (DOI)000463667900014 ()2-s2.0-85060688074 (Scopus ID)
Note

QC 20190523

Available from: 2019-05-23 Created: 2019-05-23 Last updated: 2019-05-23Bibliographically approved
Kupka, V., Zhou, Q., Ansari, F., Tang, H., Slouf, M., Vojtova, L., . . . Jancar, J. (2019). Well-dispersed polyurethane/cellulose nanocrystal nanocomposites synthesized by a solvent-free procedure in bulk. Polymer Composites, 40, E456-E465
Open this publication in new window or tab >>Well-dispersed polyurethane/cellulose nanocrystal nanocomposites synthesized by a solvent-free procedure in bulk
Show others...
2019 (English)In: Polymer Composites, ISSN 0272-8397, E-ISSN 1548-0569, Vol. 40, p. E456-E465Article in journal (Refereed) Published
Abstract [en]

Polyurethane (PU) nanocomposites utilizing cellulose nanocrystals (CNCs) as nanofiller and amorphous PU matrix were synthesized in a novel solvent-free bulk process. A green nanofiller, CNCs, was studied as reinforcement and was further modified by grafting poly(ethylene glycol) (PEG) on the CNC surface (CNC-PEG). Transmission electron microscopy revealed an excellent dispersion of the PEGylated CNC nanoparticles in the PU matrix, whereas as-received CNCs formed agglomerates. The results indicated strong improvements in tensile properties with Young's modulus increasing up to 50% and strength up to 25% for both, PU/CNC and PU/CNC-PEG nanocomposites. The enhanced tensile modulus was attributed to stiff particle reinforcement together with an increase in glass transition temperature.

Place, publisher, year, edition, pages
WILEY, 2019
National Category
Polymer Chemistry
Identifiers
urn:nbn:se:kth:diva-246291 (URN)10.1002/pc.24748 (DOI)000459570800043 ()2-s2.0-85041194513 (Scopus ID)
Note

QC 20190325

Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-03-25Bibliographically approved
Geng, S., Yao, K., Zhou, Q. & Oksman, K. (2018). High-Strength, High-Toughness Aligned Polymer-Based Nanocomposite Reinforced with Ultralow Weight Fraction of Functionalized Nanocellulose. Biomacromolecules, 19(10), 4075-4083
Open this publication in new window or tab >>High-Strength, High-Toughness Aligned Polymer-Based Nanocomposite Reinforced with Ultralow Weight Fraction of Functionalized Nanocellulose
2018 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 19, no 10, p. 4075-4083Article in journal (Refereed) Published
Abstract [en]

Multifunctional lightweight, flexible, yet strong polymer-based nanocomposites are highly desired for specific applications. However, the control of orientation and dispersion of reinforcing nanoparticles and the optimization of the interfacial interaction still pose substantial challenges in nanocellulose-reinforced polymer composites. In this study, poly(ethylene glycol) (PEG)-grafted cellulose nanofibers have demonstrated much better dispersion in a poly(lactic acid) (PLA) matrix as compared to unmodified nanocellulose. Through a uniaxial drawing method, aligned PLA/nanocellulose nanocomposites with high strength, high toughness, and unique optical behavior can be obtained. With the incorporation of 0.1 wt % of the PEG-grafted cellulose nanofibers in PLA, the ultimate strength of the aligned nanocomposite reaches 343 MPa, which is significantly higher than that of other aligned PLA-based nanocomposites reported previously. Moreover, its ultimate strength and toughness are enhanced by 39% and 70%, respectively, as compared to the aligned nanocomposite reinforced with unmodified cellulose nanofibers. In addition, the aligned nanocomposite film is highly transparent and possesses an anisotropic light scattering effect, revealing its significant potential for optical applications.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC, 2018
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-238133 (URN)10.1021/acs.biomac.8b01086 (DOI)000447118500018 ()30130395 (PubMedID)2-s2.0-85053301832 (Scopus ID)
Funder
Knut and Alice Wallenberg FoundationBio4EnergyThe Kempe Foundations
Note

QC 20181113

Available from: 2018-11-13 Created: 2018-11-13 Last updated: 2018-11-13Bibliographically approved
Morimune-Moriya, S., Salajkova, M., Zhou, Q., Nishino, T. & Berglund, L. A. (2018). Reinforcement Effects from Nanodiamond in Cellulose Nanofibril Films. Biomacromolecules, 19(7), 2423-2431
Open this publication in new window or tab >>Reinforcement Effects from Nanodiamond in Cellulose Nanofibril Films
Show others...
2018 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 19, no 7, p. 2423-2431Article in journal (Refereed) Published
Abstract [en]

Although research on nanopaper structures from cellulose nanofibrils (CNFs) is well established, the mechanical behavior is not well understood, especially not when CNF is combined with hard nanoparticles. Cationic CNF (Q-CNF) was prepared and successfully decorated by anionic nanodiamond (ND) nanoparticles in hydrocolloidal form. The Q-CNF/ND nanocomposites were filtered from a hydrocolloid and dried. Unlike many other carbon nano composites, the QCNF/ND nanocomposites were optically transparent. Reinforcement effects from the nanodiamond were remarkable, such as Young's modulus (9.8 -> 16.6 GPa) and tensile strength (209.5 -> 277.5 MPa) at a content of only 1.9% v/v of ND, and the reinforcement mechanisms are discussed. Strong effects on CNF network deformation mechanisms were revealed by loading unloading experiments. Scratch hardness also increased strongly with increased addition of ND.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2018
National Category
Biochemistry and Molecular Biology
Identifiers
urn:nbn:se:kth:diva-232787 (URN)10.1021/acs.biomac.8b00010 (DOI)000438470800007 ()29620880 (PubMedID)2-s2.0-85049752914 (Scopus ID)
Note

QC 20180806

Available from: 2018-08-06 Created: 2018-08-06 Last updated: 2018-08-06Bibliographically approved
Yao, K., Meng, Q., Bulone, V. & Zhou, Q. (2017). Flexible and Responsive Chiral Nematic Cellulose Nanocrystal/Poly(ethylene glycol) Composite Films with Uniform and Tunable Structural Color. Advanced Materials, 29(28), Article ID 1701323.
Open this publication in new window or tab >>Flexible and Responsive Chiral Nematic Cellulose Nanocrystal/Poly(ethylene glycol) Composite Films with Uniform and Tunable Structural Color
2017 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 29, no 28, article id 1701323Article in journal (Refereed) Published
Abstract [en]

The fabrication of responsive photonic structures from cellulose nanocrystals (CNCs) that can operate in the entire visible spectrum is challenging due to the requirements of precise periodic modulation of the pitch size of the self-assembled multilayer structures at the length scale within the wavelength of the visible light. The surface charge density of CNCs is an important factor in controlling the pitch size of the chiral nematic structure of the dried solid CNC films. The assembly of poly(ethylene glycol) (PEG) together with CNCs into smaller chiral nematic domains results in solid films with uniform helical structure upon slow drying. Large, flexible, and flat photonic composite films with uniform structure colors from blue to red are prepared by changing the composition of CNCs and PEG. The CNC/PEG(80/20) composite film demonstrates a reversible and smooth structural color change between green and transparent in response to an increase and decrease of relative humidity between 50% and 100% owing to the reversible swelling and dehydration of the chiral nematic structure. The composite also shows excellent mechanical and thermal properties, complementing the multifunctional property profile.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2017
Keywords
cellulose nanocrystals, chiral nematic structure, humidity indicator, stimuli-responsive materials, structural color
National Category
Biological Sciences
Identifiers
urn:nbn:se:kth:diva-211599 (URN)10.1002/adma.201701323 (DOI)000406030900030 ()2-s2.0-85020041064 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 311804
Note

QC 20170815

Available from: 2017-08-15 Created: 2017-08-15 Last updated: 2018-09-19Bibliographically approved
Geng, S., Yao, K., Harila, M., Zhou, Q. & Oksman, K. (2017). Grafting polyethylene glycol on nanocellulose toward biodegradable polymer nanocomposites. In: ICCM International Conferences on Composite Materials: . Paper presented at 21st International Conference on Composite Materials, ICCM 2017, 20 August 2017 through 25 August 2017. International Committee on Composite Materials
Open this publication in new window or tab >>Grafting polyethylene glycol on nanocellulose toward biodegradable polymer nanocomposites
Show others...
2017 (English)In: ICCM International Conferences on Composite Materials, International Committee on Composite Materials , 2017Conference paper, Published paper (Refereed)
Abstract [en]

The reinforcing effect of a small amount of nanocellulose materials on biodegradable and polymer-based nanocomposites remains challenging because of the poor dispersion of the nanomaterials and inefficient interaction between the nanocellulose and the polymer matrix. To improve this, we grafted polyethylene glycol (PEG) on nanocellulose and produced composites of 0.1 wt% nanocellulose materials and polylactic acid (PLA) matrix. Here, two types of PEG grafted nanocellulose including TEMPO-oxidized cellulose nanocrystals (TOCNCs) and cellulose nanofibers (TOCNFs), with different lengths and diameters were used as reinforcements, respectively. We investigated the effects of grafting PEG on microstructure, mechanical properties and thermal behaviors of the PLA/nanocellulose composites. It is found that the PEG grafted nanocellulose dispersed better compared to the unmodified nanocellulose in the PLA matrix, and provides higher reinforcing effect that improves the elastic modulus of the nanocomposites compared to the composites with unmodified nanocellulose and ungrafted PEG. However, the glass transition temperature of the nanocomposites was not improved by grafting PEG significantly. We also found that the nanocomposites reinforced by TOCNF exhibited enhanced mechanical and thermal properties compared to those with TOCNCs, which is caused by the higher aspect ratio of the TOCNFs. 

Place, publisher, year, edition, pages
International Committee on Composite Materials, 2017
Keywords
Dispersion, Grafting, Mechanical property, Nanocellulose, Thermal property
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-236845 (URN)2-s2.0-85053118470 (Scopus ID)
Conference
21st International Conference on Composite Materials, ICCM 2017, 20 August 2017 through 25 August 2017
Note

QC 20181221

Available from: 2018-12-21 Created: 2018-12-21 Last updated: 2018-12-21Bibliographically approved
Mushi, N. E., Kochumalayil, J. J., Cervin, N. T., Zhou, Q. & Berglund, L. A. (2016). Nanostructurally Controlled Hydrogel Based on Small-Diameter Native Chitin Nanofibers: Preparation, Structure, and Properties. ChemSusChem
Open this publication in new window or tab >>Nanostructurally Controlled Hydrogel Based on Small-Diameter Native Chitin Nanofibers: Preparation, Structure, and Properties
Show others...
2016 (English)In: ChemSusChem, ISSN 1864-5631, E-ISSN 1864-564XArticle in journal (Refereed) Published
Abstract [en]

Chitin nanofibers of unique structure and properties can be obtained from crustacean and fishery waste. These chitin nanofibers have roughly 4nm diameters, aspect ratios between 25-250, a high degree of acetylation and preserved crystallinity, and can be potentially applied in hydrogels. Hydrogels with a chitin nanofiber content of 0.4, 0.6, 0.8, 1.0, 2.0, and 3.0wt% were successfully prepared. The methodology for preparation is new, environmentally friendly, and simple as gelation is induced by neutralization of the charged colloidal mixture, inducing precipitation and secondary bond interaction between nanofibers. Pore structure and pore size distributions of corresponding aerogels are characterized using auto-porosimetry, revealing a substantial fraction of nanoscale pores. To the best of our knowledge, the values for storage (13kPa at 3wt%) and compression modulus (309kPa at 2wt%) are the highest reported for chitin nanofibers hydrogels.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2016
Keywords
Chitin, Compression, Hydrogel, Nanofibers, Rheology, Acetylation, Aspect ratio, Compaction, Gelation, Pore size, Colloidal mixtures, Compression modulus, Crystallinities, Degree of acetylation, Fishery wastes, Nano-scale pores, Secondary bonds, Structure and properties, Hydrogels
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-186753 (URN)10.1002/cssc.201501697 (DOI)000378634800011 ()2-s2.0-84963808495 (Scopus ID)
Note

QC 20160601

Available from: 2016-06-01 Created: 2016-05-13 Last updated: 2017-11-30Bibliographically approved
Tang, H., Butchosa, N. & Zhou, Q. (2015). A Transparent, Hazy, and Strong Macroscopic Ribbon of Oriented Cellulose Nanofibrils Bearing Poly(ethylene glycol). Advanced Materials, 27(12), 2070-2076
Open this publication in new window or tab >>A Transparent, Hazy, and Strong Macroscopic Ribbon of Oriented Cellulose Nanofibrils Bearing Poly(ethylene glycol)
2015 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 27, no 12, p. 2070-2076Article in journal (Refereed) Published
Abstract [en]

A macroscopic ribbon of oriented cellulose nanofibrils bearing polyethylene glycol is fabricated by stretching the cellulose nanofibrils network structure in the hydrogel state. The covalently grafted polyethylene glycol on the nanofibril surface facilitates the alignment and compartmentalization of individual nanofibrils in the ribbon. The ribbon has ultrahigh tensile strength (576 +/- 54 MPa), modulus (32.3 +/- 5.7 GPa), high transparency, and haze.

Keywords
cellulose nanofibrils, mechanical properties, optical haze, orientation, surface modification
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-165758 (URN)10.1002/adma.201404565 (DOI)000351681300013 ()25665182 (PubMedID)2-s2.0-84925114568 (Scopus ID)
Funder
EU, FP7, Seventh Framework Programme, 263017Swedish Research Council Formas, 2009-1687
Note

QC 20150504

Available from: 2015-04-29 Created: 2015-04-29 Last updated: 2017-12-04Bibliographically approved
Kanoth, B. P., Claudino, M., Johansson, M., Berglund, L. A. & Zhou, Q. (2015). Biocomposites from Natural Rubber: Synergistic Effects of Functionalized Cellulose Nanocrystals as Both Reinforcing and Cross-Linking Agents via Free-Radical Thiol-ene Chemistry. ACS Applied Materials and Interfaces, 7(30), 16303-16310
Open this publication in new window or tab >>Biocomposites from Natural Rubber: Synergistic Effects of Functionalized Cellulose Nanocrystals as Both Reinforcing and Cross-Linking Agents via Free-Radical Thiol-ene Chemistry
Show others...
2015 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 7, no 30, p. 16303-16310Article in journal (Refereed) Published
Abstract [en]

Natural rubber/cellulose nanocrystals (NR/CNCs) form true biocomposites from renewable resources and are demonstrated to show significantly improved thermo-mechanical properties and reduced stress-softening. The nanocomposites were prepared from chemically functionalized CNCs bearing thiols. CNCs served as both reinforcing and cross-linking agents in the NR matrix, and the study was designed to prove the cross-linking function of modified CNCs. CNCs were prepared from cotton, and the cross-linkable mercapto-groups were introduced onto the surface of CNCs by esterification. Nanocomposite films were prepared by dispersing the modified CNCs (m-CNCs) in NR matrix by solution casting. The cross-links at the filler matrix (m-CNCs NR) interface were generated by photochemically initiated thiol-ene reactions as monitored by real-time FTIR analysis. The synergistic effects of reinforcement and chemical cross-linking at the m-CNCs NR interface on structure, thermo-mechanical, and stress-softening behavior were investigated. Methods included field emission scanning electron microscopy (FE-SEM), swelling tests, dynamic mechanical analysis, and tensile tests. Compared to biocomposites from NR with unmodified CNCs, the NR/m-CNCs nanocomposites showed 2.4-fold increase in tensile strength, 1.6-fold increase in strain-to-failure, and 2.9-fold increase in work-of-fracture at 10 wt % of m-CNCs in NR.

Keywords
cellulose nanocrystals, natural rubber, thiol-ene chemistry, nanocomposites, interface, mechanical properties
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-173269 (URN)10.1021/acsami.5b03115 (DOI)000359279800023 ()2-s2.0-84938635081 (Scopus ID)
Note

QC 20150909

Available from: 2015-09-09 Created: 2015-09-09 Last updated: 2017-12-04Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9832-027X

Search in DiVA

Show all publications