| 1. |
- Chudinova, Ekaterina, et al.
(författare)
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Additive manufactured Ti6Al4V scaffolds with the RF-magnetron sputter deposited hydroxyapatite coating
- 2016
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Ingår i: Journal of Physics: Conference Series. - : Institute of Physics Publishing (IOPP). - 1742-6588 .- 1742-6596.
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Konferensbidrag (refereegranskat)abstract
- Present paper reports on the results of surface modification of the additively manufactured porous Ti6Al4V scaffolds. Radio frequency (RF) magnetron sputtering was used to modify the surface of the alloy via deposition of the biocompatible hydroxyapatite (HA) coating. The surface morphology, chemical and phase composition of the HA-coated alloy were studied. It was revealed that RF magnetron sputtering allows preparing a homogeneous HA coating onto the entire surface of scaffolds.
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| 2. |
- Chudinova, Ekaterina, et al.
(författare)
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In Vitro Assessment of Hydroxyapatite Coating on the Surface of Additive Manufactured Ti6Al4V Scaffolds
- 2017
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Ingår i: Materials Science Forum. - Switzerland : Trans Tech Publications Inc.. - 0255-5476 .- 1662-9752. ; 879, s. 2444-2449
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Tidskriftsartikel (refereegranskat)abstract
- Custom orthopedic and dental implants may be fabricated by additive manufacturing (AM), for example using electron beam melting technology. This study is focused on the modification of the surface of Ti6Al4V alloy coin-like scaffolds fabricated via AM technology (EBM®) by radio frequency (RF) magnetron sputter deposition of hydroxyapatite (HA) coating. The scaffolds with HA coating were characterized by Scanning Electron microscopy, X-ray diffraction. HA coating showed a nanocrystalline structure with the crystallites of an average size of 32±9 nm. The ability of the surface to support adhesion and the proliferation of human mesenchymal stem cells was studied using biological short-term tests in vitro. In according to in vitro assessment, thin HA coating stimulated the attachment and proliferation of cells. Human mesenchymal stem cells cultured on the HA-coated scaffold also formed mineralized nodules.
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| 3. |
- Eivazihollagh, Alireza, et al.
(författare)
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On chelating surfactants : Molecular perspectives and application prospects
- 2019
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Ingår i: Journal of Molecular Liquids. - : Elsevier BV. - 0167-7322 .- 1873-3166. ; 278, s. 688-705
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Tidskriftsartikel (refereegranskat)abstract
- Chelating agents, molecules that very strongly coordinates certain metal ions, are used industrially as well as in consumer products to minimize disturbances and increase performance of reactions and applications. The widely used sequestering agents, nitrilotriacetic acid (NTA), ethylenediaminetetraacetic acid (EDTA) and diethylenetriaminepentaacetic acid (DTPA) belong to this branch of readily water-soluble compounds. When these chemical structures also have hydrophobic parts, they are prone to adsorb at air-water interfaces and to self-assemble. Such bifunctional molecules can be called chelating surfactants and will have more extended utilization prospects than common chelating agents or ordinary ionic surfactants. The present review attempts to highlight the fundamental behavior of chelating surfactants in solution and at interfaces, and their very specific interactions with metal ions. Methods to recover chelating surfactants from metal chelates are also described. Moreover, utilization of chelating surfactants in applications for metal removal in environmental engineering and mineral processing, as well as for metal control in the fields of biology, chemistry and physics, is exemplified and discussed.
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| 4. |
- Cortina-Escribano, Marta, et al.
(författare)
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Degradation of Pinus sylvestris and Populus tremula by laccate Ganoderma species
- 2024
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Ingår i: Holzforschung. - : Walter de Gruyter. - 0018-3830 .- 1437-434X.
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Tidskriftsartikel (refereegranskat)abstract
- Wood chips and sawdust are used for cultivating Ganoderma lucidum mushrooms. In Northern Europe, side-streams of Pinus sylvestris are highly abundant, however as cultivation substrate they inhibit the growth of G. lucidum. To identify the changes in lignocellulosic composition after fungal degradation, the major lignocellulosic components in P. sylvestris and an optimal substrate for G. lucidum, Populus tremula were analyzed. Populus tremula was evenly degraded while the glucan fraction of P. sylvestris was not degraded and its lignin fraction was consumed almost completely. Despite not being an optimal substrate, P. sylvestris was successfully delignified by G. lucidum.
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| 5. |
- Ding, C., et al.
(författare)
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The research on anaerobic digestion conditions of biomethanation using low-temperature pyrolysis oil
- 2021
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Ingår i: Zhongguo Huanjing Kexue/China Environmental Science. - 1000-6923. ; 41:8, s. 3676-3683
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Tidskriftsartikel (refereegranskat)abstract
- This article focused on the research of anaerobic digestion conditions using low-temperature pyrolysis oil, including the fresh inoculum acclimatization, the operation conditions of pyrolysis oil (PO) digestion and the influence of biomass pyrolysis parameters. The coupling process was studied by controlling different pyrolysis parameters and anaerobic digestion parameters. It can be concluded that the fresh sludge inoculum acclimatization can significantly improve the tolerance to the inhibitors contained in the PO, thus, the methane production from the PO digestion to a great degree. The mesophilic condition was favorable to the biooil biomethanation for the low POs under 4% as used in the experiment, whereas the thermophilic condition was favorable for the high PO concentration of 10%. Besides, more methane production can be given by 0.85mm biomass particle size, 300℃ pyrolysis temperature in the downstream step of PO digestion.
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| 6. |
- Englund, Oskar, 1982, et al.
(författare)
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Meeting Sustainability Requirements for SRC Bioenergy: Usefulness of Existing Tools, Responsibilities of Involved Stakeholders, and Recommendations for Further Developments
- 2012
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Ingår i: Bioenergy Research. - : Springer Science and Business Media LLC. - 1939-1242 .- 1939-1234. ; 5:3, s. 606-620
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Tidskriftsartikel (refereegranskat)abstract
- Short rotation coppice (SRC) is considered an important biomass supply option for meeting the European renewable energy targets. This paper presents an overview of existing and prospective sustainability requirements, Member State reporting obligations and parts of the methodology for calculating GHG emissions savings within the EU Renewable Energy Directive (RED), and shows how these RED-associated sustainability criteria may affect different stakeholders along SRC bioenergy supply chains. Existing and prospective tools are assessed on their usefulness in ensuring that SRC bioenergy is produced with sufficient consideration given to the RED-associated criteria. A sustainability framework is outlined that aims at (1) facilitating the development of SRC production systems that are attractive from the perspectives of all stakeholders, and (2) ensuring that the SRC production is RED eligible. Producer manuals, EIAs, and voluntary certification schemes can all be useful for ensuring RED eligibility. However, they are currently not sufficiently comprehensive, neither individually nor combined, and suggestions for how they can be more complementary are given. Geographical information systems offer opportunities for administrative authorities to provide stakeholders with maps or databases over areas/fields suitable for RED-eligible SRC cultivation. However, proper consideration of all relevant aspects requires that all stakeholders in the SRC supply chain become engaged in the development of SRC production systems and that a landscape perspective is used.
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| 7. |
- Englund, Oskar, 1982, et al.
(författare)
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Oil palm for biodiesel in Brazil — risks and opportunities
- 2015
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Ingår i: Environmental Research Letters. - : IOP Publishing. - 1748-9318 .- 1748-9326. ; 10:4, s. 044002-
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Tidskriftsartikel (refereegranskat)abstract
- Although mainly used for other purposes, and historically mainly established at the expense of tropical forests, oil palm can be the most land efficient feedstock for biodiesel. Large parts of Brazil are suitable for oil palm cultivation and a series of policy initiatives have recently been launched to promote oil palm production. These initiatives are however highly debated both in the parliament and in academia. Here we present results of a high resolution modelling study of opportunities and risks associated with oil palm production for biodiesel in Brazil, under different energy, policy, and infrastructure scenarios. Oil palm was found to be profitable on extensive areas, including areas under native vegetation where establishment would cause large land use change (LUC) emissions. However, some 40–60 Mha could support profitable biodiesel production corresponding to approximately 10% of the global diesel demand, without causing direct LUC emissions or impinging on protected areas. Pricing of LUC emissions could make oil palm production unprofitable on most lands where conversion would impact on native ecosystems and carbon stocks, if the carbon price is at the level $125/tC, or higher.
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| 8. |
- Englund, Oskar, 1982, et al.
(författare)
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The Roles of Public and Private Governance in Promoting Sustainable Bioenergy
- 2016
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Ingår i: The Law and Policy of Biofuels. - : Edward Elgar Publishing. - 9781782544548 ; , s. 30-58
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Governance is the sum of formal and informal ways actors and institutions, public and private, manage common affairs. It is a continuing process through which diverging interests may be accommodated and cooperative action may be taken. Sustainability governance is concerned with promoting the positive effects of production or development processes whilst avoiding/mitigating their negative impacts, considering environmental, social and economic aspects of sustainability. Bioenergy supply chains involve several layers of governance, including mechanisms that specifically address bioenergy (for example bioenergy sustainability standards and certification systems) and regulation of sectors involved in bioenergy supply chains. This can involve environmental legislation, labour regulations, environmental codes, best-management agriculture/forestry practices and international trade standards. This chapter refers to three forms of governance for the promotion of the sustainable production of biomass and bioenergy: domestic public governance, domestic private governance and international private governance.
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| 9. |
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| 10. |
- Haller, Henrik, 1977-, et al.
(författare)
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Polluted lignocellulose-bearing sediments as a resource for marketable goods—a review of potential technologies for biochemical and thermochemical processing and remediation
- 2023
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Ingår i: Clean Technologies and Environmental Policy. - : Springer Science and Business Media LLC. - 1618-954X .- 1618-9558. ; 25, s. 409-425
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Tidskriftsartikel (refereegranskat)abstract
- Lignocellulose-bearing sediments are legacies of the previously unregulated wastewater discharge from the pulp and paper industry, causing large quantities of toxic organic waste on the Baltic Sea floor and on the bottom of rivers and lakes. Several km2 are covered with deposits of lignocellulosic residues, typically heavily contaminated with complex mixtures of organic and inorganic pollutants, posing a serious threat to human and ecological health. The high toxicity and the large volume of the polluted material are challenges for remediation endeavours. The lignocellulosic material is also a considerable bioresource with a high energy density, and due to its quantity, it could appeal to commercialization as feedstock for various marketable goods. This study sets out to explore the potential of using this polluted material as a resource for industrial production at the same time as it is detoxified. Information about modern production methods for lignocellulosic material that can be adapted to a polluted feedstock is reviewed. Biochemical methods such as composting, anaerobic digestion, as well as, thermochemical methods, for instance, HTC, HTL, pyrolysis, gasification and torrefaction have been assessed. Potential products from lignocellulose-bearing sediment material include biochar, liquid and gaseous biofuels, growing substrate. The use of a contaminated feedstock may make the process more expensive, but the suggested methods should be seen as an alternative to remediation methods that only involve costs. Several experiments were highlighted that support the conception that combined remediation and generation of marketable goods may be an appropriate way to address polluted lignocellulose-bearing sediments. Graphic abstract: [Figure not available: see fulltext.]
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