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Publications (10 of 65) Show all publications
An, S., Norlin, B., Hummelgård, M. & Thungström, G. (2019). Comparison of Elemental Analysis Techniques for Fly Ash from Municipal Solid Waste Incineration using X-rays and Electron Beams. In: IOP Conference Series: Earth and Environmental Science. Paper presented at International Scientific Conference on Efficient Waste Treatment 2018, EWT 2018, St. Petersburg, Russian Federation, 13 December 2018 through 14 December 2018. Institute of Physics (IOP), 337(1), Article ID 012007.
Open this publication in new window or tab >>Comparison of Elemental Analysis Techniques for Fly Ash from Municipal Solid Waste Incineration using X-rays and Electron Beams
2019 (English)In: IOP Conference Series: Earth and Environmental Science, Institute of Physics (IOP), 2019, Vol. 337, no 1, article id 012007Conference paper, Published paper (Refereed)
Abstract [en]

With the rapid expansion of the waste incineration business both in Europe and globally, there is a growing need for the elemental analysis for fly ash from municipal solid waste incineration. In this work, samples of washed and unwashed ash from municipal solid waste incineration in Sundsvall are evaluated. Qualitative analysis and semi-quantitative analysis are used to compare two elemental analysis methods, scanning electron microscope with energy dispersive spectroscopy (SEM-EDS) and X-ray fluorescence (XRF) measurement. Both methods are used to retrieve the difference in elemental composition between washed and unwashed fly ash. SEM-EDS accurately detects light elements from well-prepared samples in a vacuum environment, while, for online measurements, XRF is a potential method that analyses hazardous metal content in the fly ash. 

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2019
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-38235 (URN)10.1088/1755-1315/337/1/012007 (DOI)2-s2.0-85076187399 (Scopus ID)
Conference
International Scientific Conference on Efficient Waste Treatment 2018, EWT 2018, St. Petersburg, Russian Federation, 13 December 2018 through 14 December 2018
Available from: 2020-01-15 Created: 2020-01-15 Last updated: 2020-01-15Bibliographically approved
Niskanen, I., Forsberg, V., Zakrisson, D., Reza, S., Hummelgård, M., Andres, B., . . . Thungström, G. (2019). Determination of nanoparticle size using Rayleigh approximation and Mie theory. Chemical Engineering Science, 201(29), 222-229
Open this publication in new window or tab >>Determination of nanoparticle size using Rayleigh approximation and Mie theory
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2019 (English)In: Chemical Engineering Science, ISSN 0009-2509, E-ISSN 1873-4405, Vol. 201, no 29, p. 222-229Article in journal (Refereed) Published
Abstract [en]

Accurate determination of the size of nanoparticles has an important role in many different scientific and industrial purposes, such as in material, medical and environment sciences, colloidal chemistry and astrophysics. We describe an effective optical method to determine the size of nanoparticles by analysis of transmission and scattering of visible spectral range data from a designed UV-Vis multi-spectrophotometer. The size of the nanoparticles was calculated from the extinction cross section of the particles using Rayleigh approximation and Mie theory. We validated the method using polystyrene nanospheres, cellulose nanofibrils, and cellulose nanocrystals. A good agreement was achieved through graphical analysis between measured extinction cross section values and theoretical Rayleigh approximation and Mie theory predictions for the sizes of polystyrene nanospheres at wavelength range 450 - 750 nm. Provided that Rayleigh approximation's forward scattering (FS)/back scattering (BS) ratio was smaller than 1.3 and Mie theory's FS/BS ratio was smaller than 1.8. A good fit for the hydrodynamic diameter of nanocellulose was achieved using the Mie theory and Rayleigh approximation. However, due to the high aspect ratio of nanocellulose, the obtained results do not directly reflect the actual cross-sectional diameters of the nanocellulose. Overall, the method is a fast, relatively easy, and simple technique to determine the size of a particle by a spectrophotometer. Consequently, the method can be utilized for example in production and quality control purposes as well as for research and development applications.

Keywords
Nanoparticles, size, Rayleigh approximation, Mie theory, spectrophotometer, nanocellulose
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-35764 (URN)10.1016/j.ces.2019.02.020 (DOI)000462034900020 ()2-s2.0-85062846560 (Scopus ID)
Available from: 2019-03-08 Created: 2019-03-08 Last updated: 2019-05-20Bibliographically approved
Blomquist, N., Alimadadi, M., Hummelgård, M., Dahlström, C., Olsen, M. & Olin, H. (2019). Effects of Geometry on Large-scale Tube-shear Exfoliation of Multilayer Graphene and Nanographite in Water. Scientific Reports, 9(1), Article ID 8966.
Open this publication in new window or tab >>Effects of Geometry on Large-scale Tube-shear Exfoliation of Multilayer Graphene and Nanographite in Water
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, no 1, article id 8966Article in journal (Refereed) Published
Abstract [en]

Industrially scalable methods for the production of graphene and other nanographites are needed to achieve cost-efficient commercial products. At present, there are several available routes for the production of these materials but few allow large-scale manufacturing and environmentally friendly low-cost solvents are rarely used. We have previously demonstrated a scalable and low-cost industrial route to produce nanographites by tube-shearing in water suspensions. However, for a deeper understanding of the exfoliation mechanism, how and where the actual exfoliation occurs must be known. This study investigates the effect of shear zone geometry, straight and helical coil tubes, on this system based on both numerical simulation and experimental data. The results show that the helical coil tube achieves a more efficient exfoliation with smaller and thinner flakes than the straight version. Furthermore, only the local wall shear stress in the turbulent flow is sufficient for exfoliation since the laminar flow contribution is well below the needed range, indicating that exfoliation occurs at the tube walls. This explains the exfoliation mechanism of water-based tube-shear exfoliation, which is needed to achieve scaling to industrial levels of few-layer graphene with known and consequent quality.

National Category
Natural Sciences
Identifiers
urn:nbn:se:miun:diva-36084 (URN)10.1038/s41598-019-45133-y (DOI)000472137700062 ()2-s2.0-85067662886 (Scopus ID)
Available from: 2019-05-06 Created: 2019-05-06 Last updated: 2019-10-16Bibliographically approved
Zhang, R., Hummelgård, M., Ljunggren, J. & Olin, H. (2019). Gold and Zno-Based Metal-Semiconductor Network for Highly Sensitive Room-Temperature Gas Sensing. Sensors, 19(18), Article ID 3815.
Open this publication in new window or tab >>Gold and Zno-Based Metal-Semiconductor Network for Highly Sensitive Room-Temperature Gas Sensing
2019 (English)In: Sensors, ISSN 1424-8220, E-ISSN 1424-8220, Vol. 19, no 18, article id 3815Article in journal (Refereed) Published
Abstract [en]

Metal-semiconductor junctions and interfaces have been studied for many years due to their importance in applications such as semiconductor electronics and solar cells. However, semiconductor-metal networks are less studied because there is a lack of effective methods to fabricate such structures. Here, we report a novel Au-ZnO-based metal-semiconductor (M-S)n network in which ZnO nanowires were grown horizontally on gold particles and extended to reach the neighboring particles, forming an (M-S)n network. The (M-S)n network was further used as a gas sensor for sensing ethanol and acetone gases. The results show that the (M-S)n network is sensitive to ethanol (28.1 ppm) and acetone (22.3 ppm) gases and has the capacity to recognize the two gases based on differences in the saturation time. This study provides a method for producing a new type of metal-semiconductor network structure and demonstrates its application in gas sensing.

Keywords
gas sensors, gold particles, metal-semiconductor network, room temperature sensors, ZnO nanowires
National Category
Physical Sciences
Identifiers
urn:nbn:se:miun:diva-37307 (URN)10.3390/s19183815 (DOI)000489187800001 ()31487792 (PubMedID)2-s2.0-85071735029 (Scopus ID)
Available from: 2019-09-24 Created: 2019-09-24 Last updated: 2019-11-13Bibliographically approved
Zhang, R., Hummelgård, M., Örtegren, J., Olsen, M., Andersson, H. & Olin, H. (2019). Interaction of the human body with triboelectric nanogenerators. Nano Energy, 57, 279-292
Open this publication in new window or tab >>Interaction of the human body with triboelectric nanogenerators
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 57, p. 279-292Article in journal (Refereed) Published
Abstract [en]

The use of triboelectric nanogenerators (TENGs) is a new technique for energy harvesting at both small and large scales. Almost all types of mechanical energy can be harvested with TENGs by using four modes of operation that cover almost all mechanical motions. The interactions of the human body with TENGs range from energy harvesting, motion sensing, and biomedical applications to human-computer communications. Different types of TENGs have been developed to directly or indirectly involve the human body. This review will summarize the recent advances in the interaction of the human body with TENGs.

Keywords
Energy harvesting, Healthcare, Human body, Human-robot interactions, Sensors, Triboelectric nanogenerators
National Category
Other Physics Topics
Identifiers
urn:nbn:se:miun:diva-35386 (URN)10.1016/j.nanoen.2018.12.059 (DOI)000458419000028 ()2-s2.0-85059038089 (Scopus ID)
Available from: 2019-01-06 Created: 2019-01-06 Last updated: 2019-03-18Bibliographically approved
Zhang, R., Hummelgård, M., Örtegren, J., Yang, Y., Andersson, H., Balliu, E., . . . Olin, H. (2019). Sensing body motions based on charges generated on the body. Nano Energy, 63, Article ID 103842.
Open this publication in new window or tab >>Sensing body motions based on charges generated on the body
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2019 (English)In: Nano Energy, ISSN 2211-2855, E-ISSN 2211-3282, Vol. 63, article id 103842Article in journal (Refereed) Published
Abstract [en]

The sensing of body motions is of great importance in areas such as healthcare, rehabilitation, and human-computer interactions. Different methods have been developed based on visual or electrical signals. However, such signals are acquired by external devices and are not intrinsic signals that are created on the body. Here, we report a new universal body motion sensor (UBS) to detect motions based on the intrinsic contact electrification (CE) of the skin or electrical induction (EI) of the body. The CE or EI generates charges on the body, leading to potential differences between the body and ground that can be measured to identify different body motions, such as motions of the head, arms, fingers, waist, legs, feet and toes. Proof-of-concept experiments have demonstrated that the UBS can be used to monitor the conditions of people with Parkinson's disease (PD) and to quantitatively monitor the recovery of those with a leg injury, suggesting great potential for healthcare applications.

Keywords
Body motions, Sensors, Charges, Contact electrification, Electrical induction, Healthcare
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:miun:diva-36826 (URN)10.1016/j.nanoen.2019.06.038 (DOI)000480422400034 ()2-s2.0-85068234493 (Scopus ID)
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-10-16Bibliographically approved
Phadatare, M. R., Patil, R., Blomquist, N., Forsberg, S., Örtegren, J., Hummelgård, M., . . . Olin, H. (2019). Silicon-Nanographite Aerogel-Based Anodes for High Performance Lithium Ion Batteries. Scientific Reports, 9, Article ID 14621.
Open this publication in new window or tab >>Silicon-Nanographite Aerogel-Based Anodes for High Performance Lithium Ion Batteries
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2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 14621Article in journal (Refereed) Published
Abstract [en]

To increase the energy storage density of lithium-ion batteries, silicon anodes have been explored due to their high capacity. One of the main challenges for silicon anodes are large volume variations during the lithiation processes. Recently, several high-performance schemes have been demonstrated with increased life cycles utilizing nanomaterials such as nanoparticles, nanowires, and thin films. However, a method that allows the large-scale production of silicon anodes remains to be demonstrated. Herein, we address this question by suggesting new scalable nanomaterial-based anodes. Si nanoparticles were grown on nanographite flakes by aerogel fabrication route from Si powder and nanographite mixture using polyvinyl alcohol (PVA). This silicon-nanographite aerogel electrode has stable specific capacity even at high current rates and exhibit good cyclic stability. The specific capacity is 455 mAh g−1 for 200th cycles with a coulombic efficiency of 97% at a current density 100 mA g−1.

Keywords
Silicon-Nanographite Aerogel-Based Anodes for High Performance Lithium Ion Batteries Supplementary Information
National Category
Nano Technology
Identifiers
urn:nbn:se:miun:diva-37569 (URN)10.1038/s41598-019-51087-y (DOI)000489555900015 ()2-s2.0-85073112106 (Scopus ID)
Available from: 2019-10-24 Created: 2019-10-24 Last updated: 2019-11-14Bibliographically approved
Zhang, R., Hummelgård, M., Olin, H., Blomquist, N. & Andres, B. (2019). The application of papers in energy harvesting and storage. In: : . Paper presented at 2019 China International Specialty Papers Expo & Conference, Quzhou, China, October 16-18, 2019.
Open this publication in new window or tab >>The application of papers in energy harvesting and storage
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Physical Sciences
Identifiers
urn:nbn:se:miun:diva-37824 (URN)
Conference
2019 China International Specialty Papers Expo & Conference, Quzhou, China, October 16-18, 2019
Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-12-13Bibliographically approved
Zhang, R., Olin, H., Hummelgård, M., Olsen, M., Andersson, H., Dahlström, C. & Örtegren, J. (2019). Towards large area energy harvesting using triboelectric nangenerators fabricated with green materials. In: : . Paper presented at NENS 2019 The 4th International Conference on Nanoenergy and Nanosystems, June 15-17, 2019 Beijing, China.
Open this publication in new window or tab >>Towards large area energy harvesting using triboelectric nangenerators fabricated with green materials
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2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
National Category
Physical Sciences
Identifiers
urn:nbn:se:miun:diva-37823 (URN)
Conference
NENS 2019 The 4th International Conference on Nanoenergy and Nanosystems, June 15-17, 2019 Beijing, China
Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2019-12-09Bibliographically approved
Zhang, R., Carlsson, F., Edman, M., Hummelgård, M., Jonsson, B.-G., Bylund, D. & Olin, H. (2018). Escherichia coli Bacteria Develop Adaptive Resistance to Antibacterial ZnO Nanoparticles. Advanced Biosystem, 2(5), Article ID 1800019.
Open this publication in new window or tab >>Escherichia coli Bacteria Develop Adaptive Resistance to Antibacterial ZnO Nanoparticles
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2018 (English)In: Advanced Biosystem, ISSN 2366-7478, Vol. 2, no 5, article id 1800019Article in journal (Refereed) Published
Abstract [en]

Antibacterial agents based on nanoparticles (NPs) have many important applications, e.g., for the textile industry, surface disinfection, wound dressing, water treatment, and food preservation. Because of their prevalent use it is important to understand whether bacteria could develop resistance to such antibacterial NPs similarly to the resistance that bacteria are known to develop to antibiotics. Here, it is reported that Escherichia coli(E. coli) develops adaptive resistance to antibacterial ZnO NPs after several days' exposure to the NPs. But, in contrast to antibiotics‐resistance, the observed resistance to ZnO NPs is not stable—after several days without exposure to the NPs, the bacteria regain their sensitivity to the NPs' antibacterial properties. Based on the analyses it is suggested that the observed resistance is caused by changes in the shape of the bacteria and the expressions of membrane proteins. The findings provide insights into the response of bacteria to antibacterial NPs, which is important to elucidate for designing and evaluating the risk of applications based on antibacterial NPs.

Place, publisher, year, edition, pages
John Wiley & Sons, 2018
National Category
Nano Technology
Identifiers
urn:nbn:se:miun:diva-34436 (URN)10.1002/adbi.201800019 (DOI)000446970000008 ()2-s2.0-85065053901 (Scopus ID)
Available from: 2018-09-18 Created: 2018-09-18 Last updated: 2019-07-08Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-9137-3440

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