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Velarde, L., Nikjoo, D., Escalera, E. & Akhtar, F. (2024). Bolivian natural zeolite as a low-cost adsorbent for the adsorption of cadmium: Isotherms and kinetics. Heliyon, 10(1), Article ID e24006.
Open this publication in new window or tab >>Bolivian natural zeolite as a low-cost adsorbent for the adsorption of cadmium: Isotherms and kinetics
2024 (English)In: Heliyon, E-ISSN 2405-8440, Vol. 10, no 1, article id e24006Article in journal (Refereed) Published
Abstract [en]

Population growth in recent years has led to increased wastewater production and pollution of water resources. This situation also heavily affects Bolivia, so wastewater treatment methods and materials suitable for Bolivian society should be explored. This study investigated the natural Bolivian Zeolite (BZ) and its NaCl-modified structure (NaBZ) as adsorbents for cadmium removal from water. The natural BZ and the modified form NaBZ were investigated by different physicochemical characterization techniques. Furthermore, XPS and FT-IR techniques were used to investigate the adsorption mechanisms. The cadmium adsorption on BZ and NaBZ was analyzed using various mathematical models, and the Langmuir model provided a better description of the experimental adsorption data with cadmium adsorption capacities of 20.2 and 25.6 mg/g for BZ and NaBZ, respectively. The adsorption followed the pseudo-second order kinetics. The effect of different parameters, such as initial cadmium concentration and pH on the adsorption was studied. In addition, the results of the regeneration test indicated that both BZ and NaBZ can be regenerated by using hydrochloric acid (HCl). Finally, the adsorption experiment of BZ and NaBZ on a real water sample (brine from Salar de Uyuni salt flat) containing a mixture of different heavy metals was carried out. The results obtained in this study demonstrate the effectiveness of natural BZ and modified NaBZ in the removal of heavy metals from wastewater.

Keywords
Adsorption, Cadmium, Clinoptilolite, Heavy metals, Natural zeolites
National Category
Organic Chemistry
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-103749 (URN)10.1016/j.heliyon.2024.e24006 (DOI)38234893 (PubMedID)2-s2.0-85181824101 (Scopus ID)
Funder
Sida - Swedish International Development Cooperation Agency, 13486
Note

Validerad;2024;Nivå 2;2024-2-01 (signyg)

Full text license: CC BY-NC-ND

Available from: 2024-01-16 Created: 2024-01-16 Last updated: 2024-02-01Bibliographically approved
Shezad, N., D'Agostini, M., Ezzine, A., Franchin, G., Colombo, P. & Akhtar, F. (2023). 3D-printed zeolite 13X-Strontium chloride units as ammonia carriers. Heliyon, 9(9), Article ID e19376.
Open this publication in new window or tab >>3D-printed zeolite 13X-Strontium chloride units as ammonia carriers
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2023 (English)In: Heliyon, E-ISSN 2405-8440, Vol. 9, no 9, article id e19376Article in journal (Refereed) Published
Abstract [en]

The selective catalytic reduction (SCR) system in automobiles using urea solution as a source of NH3 suffers from solid deposit problems in pipelines and poor efficiency during engine startup. Although direct use of high pressure NH3 is restricted due to safety concerns, which can be overcome by using solid sorbents as NH3 carrier. Strontium chloride (SrCl2) is considered the best sorbent due to its high sorption capacity; however, challenges are associated with the processing of stable engineering structures due to extraordinary volume expansion during the NH3 sorption. This study reports the fabrication of a novel structure consisting of a zeolite cage enclosing the SrCl2 pellet (SPZC) through extrusion-based 3D printing (Direct Ink Writing). The printed SPZC structure demonstrated steady sorption of NH3 for 10 consecutive cycles without significant uptake capacity and structural integrity loss. Furthermore, the structure exhibited improved sorption and desorption kinetics than pure SrCl2. The synergistic effect of zeolite as physisorbent and SrCl2 as chemisorbent in the novel composite structure enabled the low-pressure (<0.4 bar) and high-pressure (>0.4 bar) NH3 sorption, compared to pure SrCl2, which absorbed NH3 at pressures above 0.4 bar. Regeneration of SPZC composite sorbent under evacuation showed that 87.5% percent of NH3 was desorbed at 20 °C. Thus, the results demonstrate that the rationally designed novel SPZC structure offers safe and efficient storage of NH3 in the SCR system and other applications.

Place, publisher, year, edition, pages
Elsevier Ltd, 2023
Keywords
3D printed structure, Alkaline earth metal halides, Ammonia, Kinetics, Physicochemical sorption, Zeolite
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-101361 (URN)10.1016/j.heliyon.2023.e19376 (DOI)2-s2.0-85170028852 (Scopus ID)
Funder
Swedish Research Council Formas, 2016-01099Swedish Research Council, 2018-04407
Note

Validerad;2023;Nivå 2;2023-09-19 (joosat);

CC BY 4.0 License

Available from: 2023-09-19 Created: 2023-09-19 Last updated: 2023-09-19Bibliographically approved
Velarde, L., Nabavi, M. S., Escalera, E., Antti, M.-L. & Akhtar, F. (2023). Adsorption of heavy metals on natural zeolites: A review. Chemosphere, 328, Article ID 138508.
Open this publication in new window or tab >>Adsorption of heavy metals on natural zeolites: A review
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2023 (English)In: Chemosphere, ISSN 0045-6535, E-ISSN 1879-1298, Vol. 328, article id 138508Article, review/survey (Refereed) Published
Abstract [en]

Water pollution has jeopardized human health, and a safe supply of drinking water has been recognized as a worldwide issue. The increase in the accumulation of heavy metals in water from different sources has led to the search for efficient and environmentally friendly treatment methods and materials for their removal. Natural zeolites are promising materials for removing heavy metals from different sources contaminating the water. It is important to know the structure, chemistry, and performance of the removal of heavy metals from water, of the natural zeolites to design water treatment processes. This review focuses on critical analyses of the application of distinct natural zeolites for the adsorption of heavy metals from water, specifically, arsenic (As(III), As(V)), cadmium (Cd(II)), chromium (Cr(III), Cr(VI)), lead (Pb(II)), mercury(Hg(II)) and nickel (Ni(II)). The reported results of heavy-metal removal by natural zeolites are summarized, and the chemical modification of natural zeolites by acid/base/salt reagent, surfactants, and metallic reagents has been analyzed, compared, and described. Furthermore, the adsorption/desorption capacity, systems, operating parameters, isotherms, and kinetics for natural zeolites were described and compared. According to the analysis, clinoptilolite is the most applied natural zeolite to remove heavy metals. It is effective in removing As, Cd, Cr, Pb, Hg, and Ni. Additionally, an interesting fact is a variation between the natural zeolites from different geological origins regarding the sorption properties and capacities for heavy metals suggesting that natural zeolites from different regions of the world are unique.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Adsorption, Heavy metals, Wastewater, Natural zeolites, Clinoptilolite
National Category
Other Earth and Related Environmental Sciences
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-96687 (URN)10.1016/j.chemosphere.2023.138508 (DOI)36972873 (PubMedID)2-s2.0-85151497625 (Scopus ID)
Funder
Sida - Swedish International Development Cooperation Agency, 13486
Note

Validerad;2023;Nivå 2;2023-04-21 (joosat);

Funder: National Natural ScienceFoundation of China (52020105011)

Licens fulltext: CC BY License

Available from: 2023-04-21 Created: 2023-04-21 Last updated: 2023-09-05Bibliographically approved
Pankratova, D., Giacomelli, S. M., Yusupov, K., Akhtar, F. & Vomiero, A. (2023). Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy. ACS Omega, 8(16), 14484-14489
Open this publication in new window or tab >>Co-Cr-Fe-Mn-Ni Oxide as a Highly Efficient Thermoelectric High-Entropy Alloy
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2023 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 8, no 16, p. 14484-14489Article in journal (Refereed) Published
Abstract [en]

Among the existing materials for heat conversion, high-entropy alloys are of great interest due to the tunability of their functional properties. Here, we aim to produce single-phase high-entropy oxides composed of Co-Cr-Fe-Mn-Ni-O through spark plasma sintering (SPS), testing their thermoelectric (TE) properties. This material was successfully obtained before via a different technique, which requires a very long processing time. Hence, the main target of this work is to apply spark plasma sintering, a much faster and scalable process. The samples were sintered in the temperature range of 1200–1300 °C. Two main phases were formed: rock salt-structured Fm3̅m and spinel-structured Fd3̅m. Comparable transport properties were achieved via the new approach: the highest value of the Seebeck coefficient reached −112.6 μV/K at room temperature, compared to −150 μV/K reported before; electrical properties at high temperatures are close to the properties of the single-phase material (σ = 0.2148 S/cm, σ ≈ 0.2009 S/cm reported before). These results indicate that SPS can be successfully applied to produce highly efficient TE high-entropy alloys in a fast and scalable way. Further optimization is needed for the production of single-phase materials, which are expected to exhibit an even better TE functionality.

Place, publisher, year, edition, pages
American Chemical Society, 2023
National Category
Materials Chemistry
Research subject
Experimental Physics; Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-97040 (URN)10.1021/acsomega.2c08278 (DOI)2-s2.0-85154024927 (Scopus ID)
Funder
The Kempe FoundationsKnut and Alice Wallenberg FoundationLuleå University of Technology
Note

Validerad;2023;Nivå 2;2023-05-10 (joosat);

Funder: Swedish Foundations Consolidator Fellowship;

Licens fulltext: CC BY License

Available from: 2023-05-10 Created: 2023-05-10 Last updated: 2023-05-10Bibliographically approved
Edgren, A., Ström, E., Frisk, L., Akhtar, F. & Hörnqvist Colliander, M. (2023). High temperature compression of Mo(Si,Al)2-Al2O3 composites. Materials Science & Engineering: A, 865, Article ID 144583.
Open this publication in new window or tab >>High temperature compression of Mo(Si,Al)2-Al2O3 composites
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2023 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 865, article id 144583Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to investigate the effect on high temperature of mechanical properties of adding Al2O3 particles to polycrystalline Mo(Si,Al)2. Mo(Si,Al)2-Al2O3 composites, containing 0–25 wt% Al2O3 particles have been compression tested at 1300 °C, and the microstructure after deformation was studied using electron backscatter diffraction. It was shown that even small amounts (5 wt%) of Al2O3 particles resulted in a grain-refined material through inhibition of grain growth during sintering, which lead to lower flow stresses compared to the coarse-grained Al2O3-free material. The inverse grain size effect and post-test microstructure investigations suggest that creep-like deformation mechanisms dominate in fine grained Mo(Si,Al)2-Al2O3 composites at 1300 °C. In the materials containing 5–15 wt% Al2O3, the maximum stress decreased with increasing Al2O3 content. In materials with higher Al2O3 additions, the maximum stress increased with the Al2O3 addition, but did not reach the strength levels in the Al2O3-free reference material. It is suggested that the deformation behaviour is affected by electroplasticity effects as resistive heating was used. Electroplasticity contributes to the decrease in maximum stress observed in the lower Al2O3 containing materials, while this is outweighed by particle strengthening at higher Al2O3 contents.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
Electron backscatter diffraction, Electroplasticity, High temperature compression, Mo(si, Al)2, Particle strengthening
National Category
Composite Science and Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-95494 (URN)10.1016/j.msea.2023.144583 (DOI)2-s2.0-85146254448 (Scopus ID)
Funder
Swedish Foundation for Strategic Research
Note

Validerad;2023;Nivå 2;2023-04-12 (sofila);

Funder: Kanthal AB (grant no. ID18-0064.)

Available from: 2023-04-12 Created: 2023-04-12 Last updated: 2023-04-12Bibliographically approved
Feltrin, A. C. & Akhtar, F. (2023). High-temperature oxidation kinetics of a metastable dual-phase diboride and a high-entropy diboride. Journal of the European Ceramic Society, 43(16), 7363-7372
Open this publication in new window or tab >>High-temperature oxidation kinetics of a metastable dual-phase diboride and a high-entropy diboride
2023 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 43, no 16, p. 7363-7372Article in journal (Refereed) Published
Abstract [en]

The processing of multicomponent (Ti0.25V0.25Zr0.25Hf0.25)B2 ultra-high temperature hexagonal transition metal diboride in dual-phase and single-phase microstructures and investigation of oxidation behavior in the air at 1000 and 1500 °C are reported. The dual-phase diboride is a metastable phase composed of Hf-Zr-rich and Ti-V-rich phases that undergo phase transformation to a single-phase high-entropy diboride after thermal annealing. At 1000 °C, a B2O3 layer was formed on the material's surface, and the oxidation kinetics followed a para-linear behavior. At 1500 °C, a porous oxide layer was formed, facilitating oxygen diffusion and reaction with the diboride, resulting in linear oxidation kinetics. The prediction of the lifetime of the materials during high-temperature oxidation suggested that the high-entropy material outperforms the dual-phase diboride, making it most suitable for related applications. The superior performance of the high-entropy single-phase diboride was associated with the high-entropy and sluggish diffusion effects.

Place, publisher, year, edition, pages
Elsevier, 2023
Keywords
High-entropy diborides, Ultra-high temperature ceramics, High-temperature oxidation, Oxidation kinetics
National Category
Materials Chemistry Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-99781 (URN)10.1016/j.jeurceramsoc.2023.08.001 (DOI)2-s2.0-85168338617 (Scopus ID)
Funder
Swedish Foundation for Strategic Research, RIF14-0083
Note

Validerad;2023;Nivå 2;2023-11-09 (hanlid);

Full text license: CC BY

Available from: 2023-08-15 Created: 2023-08-15 Last updated: 2023-11-09Bibliographically approved
Narang Landström, K., Nambi, A., Kaiser, A. & Akhtar, F. (2023). Inducing hierarchical pores in nano-MOFs for efficient gas separation. RSC Advances, 13(24), 16039-16046
Open this publication in new window or tab >>Inducing hierarchical pores in nano-MOFs for efficient gas separation
2023 (English)In: RSC Advances, E-ISSN 2046-2069, Vol. 13, no 24, p. 16039-16046Article in journal (Refereed) Published
Abstract [en]

The synthesis of metal-organic frameworks (MOFs) and their processing into structures with tailored hierarchical porosity is essential for using MOFs in the adsorption-driven gas separation process. We report the synthesis of modified Cu-MOF nanocrystals for CO2 separation from CH4 and N2, prepared from DABCO (1,4-diazabicyclo[2.2.2] octane) and 9,10 anthracene dicarboxylic acid linkers with copper metal salt. The synthesis parameters were optimized to introduce mesoporosity in the microporous Cu-MOF crystals. The volumetric CO2 adsorption capacity of the new hierarchical Cu-MOF was 2.58 mmol g−1 at 293 K and 100 kPa with a low isosteric heat of adsorption of 28 kJ mol−1. The hierarchical Cu-MOF nanocrystals were structured into mechanically stable pellets with a diametral compression strength exceeding 1.2 MPa using polyvinyl alcohol (PVA) as a binder. The CO2 breakthrough curves were measured from a binary CO2-CH4 (45/55 vol%) gas mixture at 293 K and 400 kPa pressure on Cu-MOF pellets to demonstrate the role of hierarchical porosity in mass transfer kinetics during adsorption. The structured hierarchical Cu-MOF pellets showed stable cyclic CO2 adsorption capacity during 5 adsorption-desorption cycles with a CO2 uptake capacity of 3.1 mmol g−1 at 400 kPa and showed a high mass transfer coefficient of 1.8 m s−1 as compared to the benchmark zeolite NaX commercialized binderless granules, suggesting that the introduction of hierarchical porosity in Cu-MOF pellets can effectively reduce the time for CO2 separation cycles.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2023
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-98628 (URN)10.1039/d3ra01175e (DOI)000997158400001 ()37260714 (PubMedID)2-s2.0-85161277964 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-06-20 (hanlid);

Funder: Innovation Fund Denmark (5157-00008A); Nordic Energy Research (100766)

Available from: 2023-06-20 Created: 2023-06-20 Last updated: 2023-09-05Bibliographically approved
Iqbal, M. N., Robert-Nicoud, G., Ciurans Oset, M., Akhtar, F., Hedin, N. & Bengtsson, T. (2023). Mesoporous Silica Particles Retain Their Structure and Function while Passing through the Gastrointestinal Tracts of Mice and Humans. ACS Applied Materials and Interfaces, 15(7), 9542-9553
Open this publication in new window or tab >>Mesoporous Silica Particles Retain Their Structure and Function while Passing through the Gastrointestinal Tracts of Mice and Humans
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2023 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 15, no 7, p. 9542-9553Article in journal (Refereed) Published
Abstract [en]

Mesoporous silica particles (MSPs) can be used as food additives, clinically for therapeutic applications, or as oral delivery vehicles. It has also been discussed to be used for a number of novel applications including treatment for diabetes and obesity. However, a major question for their possible usage has been if these particles persist structurally and retain their effect when passing through the gastrointestinal tract (GIT). A substantial breaking down of the particles could reduce function and be clinically problematic for safety issues. Hence, we investigated the biostability of MSPs of the SBA-15 kind prepared at large scales (100 and 1000 L). The MSPs were orally administered in a murine model and clinically in humans. A joint extraction and calcination method was developed to recover the MSPs from fecal mass, and the MSPs were characterized physically, structurally, morphologically, and functionally before and after GIT passage. Analyses with N2 adsorption, X-ray diffraction, electron microscopy, and as a proxy for general function, adsorption of the enzyme α-amylase, were conducted. The adsorption capacity of α-amylase on extracted MSPs was not reduced as compared to the pristine and control MSPs, and adsorption of up to 17% (w/w) was measured. It was demonstrated that the particles did not break down to any substantial degree and retained their function after passing through the GITs of the murine model and in humans. The fact the particles were not absorbed into the body was ascribed to that they were micron-sized and ingested as agglomerates and too big to pass the intestinal barrier. The results strongly suggest that orally ingested MSPs can be used for a number of clinical applications.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2023
Keywords
mesoporous silica particles, biostability, gastrointestinal tract, protein adsorption, porcine pancreatic α-amylase
National Category
Other Medical Biotechnology
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-95802 (URN)10.1021/acsami.2c16710 (DOI)000928638000001 ()36731867 (PubMedID)2-s2.0-85147567459 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-03-08 (joosat);

Licens fulltext: CC BY License

Available from: 2023-03-08 Created: 2023-03-08 Last updated: 2023-05-08Bibliographically approved
Akinwekomi, A. & Akhtar, F. (2023). Microstructural, Mechanical, and Electrochemical Characterization of CrMoNbTiZr High-Entropy Alloy for Biomedical Application. Materials, 16(15), Article ID 5320.
Open this publication in new window or tab >>Microstructural, Mechanical, and Electrochemical Characterization of CrMoNbTiZr High-Entropy Alloy for Biomedical Application
2023 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 16, no 15, article id 5320Article in journal (Refereed) Published
Abstract [en]

High-entropy alloys (HEA) with superior biocompatibility, high pitting resistance, minimal debris accumulation, and reduced release of metallic ions into surrounding tissues are potential replacements for traditional metallic bio-implants. A novel equiatomic HEA based on biocompatible metals, CrMoNbTiZr, was consolidated by spark plasma sintering (SPS). The relative sintered density of the alloy was about 97% of the theoretical density, indicating the suitability of the SPS technique to produce relatively dense material. The microstructure of the sintered HEA consisted of a BCC matrix and Laves phase, corresponding to the prediction of the thermodynamic CALPHAD simulation. The HEA exhibited a global Vickers microhardness of 531.5 ± 99.7 HV, while the individual BCC and Laves phases had hardness values of 364.6 ± 99.4 and 641.8 ± 63.0 HV, respectively. Its ultimate compressive and compressive yield strengths were 1235.7 ± 42.8 MPa and 1110.8 ± 78.6 MPa, respectively. The elasticity modulus of 34.9 ± 2.9 GPa of the HEA alloy was well within the range of cortical bone and significantly lower than the values reported for commonly used biomaterials made from Ti-based and Cr–Co-based alloys. In addition, the alloy exhibited good resistance to bio-corrosion in PBS and Hanks solutions. The CrMoNbTiZr HEA exhibited an average COF of 0.43 ± 0.06, characterized mainly by abrasive and adhesive wear mechanisms. The CrMoNbTiZr alloy’s mechanical, bio-corrosion, and wear resistance properties developed in this study showed a good propensity for application as a biomaterial.

Place, publisher, year, edition, pages
MDPI, 2023
Keywords
high-entropy alloy, biomaterials, CrMoNbTiZr, powder methods, bio-corrosion
National Category
Metallurgy and Metallic Materials
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-100670 (URN)10.3390/ma16155320 (DOI)2-s2.0-85167832206 (Scopus ID)
Funder
Swedish Foundation for Strategic Research, RIF14–0083
Note

Validerad;2023;Nivå 2;2023-08-22 (hanlid);

Funder: National Natural Science Foundation of China (52020105011)

Available from: 2023-08-22 Created: 2023-08-22 Last updated: 2023-10-11Bibliographically approved
Wang, H., Yang, K., Wang, J., Shi, Y., Feng, P., Huang, Y., . . . Akhtar, F. (2023). Preparation and Properties of Microporous Nickel with High Porosity. Rare Metal Materials and Engineering, 52(3), 876-882
Open this publication in new window or tab >>Preparation and Properties of Microporous Nickel with High Porosity
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2023 (English)In: Rare Metal Materials and Engineering, ISSN 1002-185X, Vol. 52, no 3, p. 876-882Article in journal (Refereed) Published
Abstract [en]

The strategy of sintered closed-hole followed by reopening was proposed to prepare the microporous nickel material with high porosity through the powder metallurgy and subsequential treatments. The carbonyl nickel powder with particle size of 1 mu m was used as raw material, and the effects of sintering process parameters on the pore properties and mechanical properties of microporous nickel were studied. Results show that the porosity measured by mercury injection method of microporous nickel is 53.7%, and the average pore diameter is 612.25 nm at the sintering temperature of 400 degrees C. After machining, the porosity measured by mercury injection method is 54.0%, and the average pore diameter is 511.37 nm, which still satisfies the requirements of engineering application. The strategy provides providing a new approach for the preparation of microporous nickel and other porous metal materials.

Place, publisher, year, edition, pages
Northwest Institute for Nonferrous Metal Research, 2023
Keywords
high porosity, microporous structure, microporous nickel, preparation process, machining performance
National Category
Manufacturing, Surface and Joining Technology
Research subject
Engineering Materials
Identifiers
urn:nbn:se:ltu:diva-97658 (URN)10.12442/j.issn.1002-185X.20220495 (DOI)000956833100013 ()2-s2.0-85161030580 (Scopus ID)
Note

Validerad;2023;Nivå 2;2023-05-29 (marisr);

Funder: Science and Technology Department of Shaanxi Province (2021KJXX-75); National Natural Science Foundation of China (52020105011)

Available from: 2023-05-29 Created: 2023-05-29 Last updated: 2023-12-12Bibliographically approved
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