| 1. |
- Mianehrow, Hanieh, et al.
(författare)
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Energy monitoring of plastic injection molding process running with hydraulic injection molding machines
- 2017
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Ingår i: Journal of Cleaner Production. - : ELSEVIER SCI LTD. - 0959-6526 .- 1879-1786. ; 148, s. 804-810
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Tidskriftsartikel (refereegranskat)abstract
- With respect to the importance of energy consumption reduction in industrial plants, an attempt has been made to specify the most important parameters affecting energy consumption of plastic injection molding process as one of the most energy intensive processes in plastics industry. In this regard, the specific energy consumption of six hydraulic injection molding machines and the profile of their energy consumption over one cycle of injection molding process were measured to assess the effect of different machine related and process related parameters on energy consumption and realize energy saving opportunities in the injection molding process."Results showed that among all quantitative parameters, throughput and total cycle time, which are process related parameters, have the most important impact on the specific energy consumption of the process. Whereas, the most important effect of machine related parameters were found to be on the peak power of energy consumption, which gives an insight to industrial plants how to reduce the maximum electrical demand of the plant. In addition, it was proved that each hydraulic injection molding machine has a unique profile of energy consumption depending on the design of the machine and process, and then according to these profiles, three types of process designs were identified.
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| 2. |
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| 3. |
- Mianehrow, Hanieh, et al.
(författare)
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MOISTURE EFFECTS IN NANOCOMPOSITES OF 2D GRAPHENE OXIDE IN CELLULOSE NANOFIBER (CNF) MATRIX : A MOLECULAR DYNAMICS STUDY
- 2022
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Ingår i: ECCM 2022. - : Composite Construction Laboratory (CCLab), Ecole Polytechnique Federale de Lausanne (EPFL). ; , s. 718-725
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Konferensbidrag (refereegranskat)abstract
- Moisture largely affects properties in nanocellulose-based nanocomposites. Despite this fact, in-depth studies on moisture effects at the interface in such nanocomposites is missing. In this work, molecular dynamics (MD) simulation is used to study effects from moisture at cellulose nanofibril (CNF)-graphene oxide (GO) interfaces on atomistic level. Two nanocellulose models with different surface chemistry are used as models for native cellulose nanofibrils (NCNF) and TEMPO-oxidized cellulose nanofibrils (TCNF). Work of adhesion and interfacial shear strength at CNF-GO interface is calculated and compared with CNF-graphene interface to study interaction mechanisms. Simulations are done in the presence and absence of water to study the effect of moisture. Interfacial adhesion mechanism between CNF and GO is also investigated.
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| 4. |
- Mianehrow, Hanieh, et al.
(författare)
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Moisture effects on mechanical behavior of CNF-RGO nanocomposites showing electrical conductivity
- 2022
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Ingår i: Composites. Part A, Applied science and manufacturing. - : Elsevier BV. - 1359-835X .- 1878-5840. ; 163
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Tidskriftsartikel (refereegranskat)abstract
- Water-processed nanocomposites based on cellulose nanofibrils (CNF and 2D platelets are sustainable alternatives to nanocomposites from fossil-based polymers. The degree of dispersion of 2D platelets in CNF matrix is critical to mechanical properties, but reduced graphene oxide (RGO) has poor hydrocolloidal stability. This is addressed by forming electrically conductive and strong CNF-RGO nanocomposites by green chemical reduction of wet, vacuum-filtered CNF-GO cakes, taking advantage of the colloidal dispersibility of GO platelets in CNF, as characterized in the solid nanocomposite by SAXS, WAXS and FE-SEM. CNF-RGO nanocomposite with 2 wt% RGO shows a Youngs modulus of 20.4 GPa and tensile strength of 319 MPa, with considerable ductility at 50 % RH. Although CNF-GO shows much higher moisture sorption than CNF-RGO at 90 %RH, the CNF-GO mechanical properties are higher, for thermodynamic reasons, MD simulations predict dry, hydrogen-bonded CNF-GO interfaces even in wet conditions, and this can explain the better performance of CNF-GO.
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| 5. |
- Mianehrow, Hanieh, et al.
(författare)
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Strong nanopaperes based on cellulose nanofibrils and graphene oxide
- 2020
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Ingår i: ECCM 2018 - 18th European Conference on Composite Materials. - : Applied Mechanics Laboratory.
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Konferensbidrag (refereegranskat)abstract
- With respect to the importance of high performance bio-based composites, an attempt was made to prepare biocomposites based on cellulose nanofibers (CNF) and Graphene oxide (GO) to study the synergistic effect of their superior properties on the mechanical properties of the resultant biocomposite. Mechanical testing showed the addition of only 0.1 wt% of GO to CNF results in a composite with 17.3 GPa modulus. This effective reinforcement by adding a small amount of GO, shows the efficient stress transfer from CNF to GO that is the result of utilizing large GO sheets with high aspect ratio, effective dispersion of GO in the nanocomposite and the layered structure of the resultant nanocomposite.
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| 6. |
- Mianehrow, Hanieh, et al.
(författare)
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Strong reinforcement effects in 2D cellulose nanofibril-graphene oxide (CNF-GO) nanocomposites due to GO-induced CNF ordering
- 2020
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Ingår i: Journal of Materials Chemistry A. - : Royal Society of Chemistry (RSC). - 2050-7496 .- 2050-7488. ; 8:34, s. 17608-17620
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Tidskriftsartikel (refereegranskat)abstract
- Nanocomposites from native cellulose with low 2D nanoplatelet content are of interest as sustainable materials combining functional and structural performance. Cellulose nanofibril-graphene oxide (CNF-GO) nanocomposite films are prepared by a physical mixing-drying method, with a focus on low GO content, the use of very large GO platelets (2-45 mu m) and nanostructural characterization using synchrotron X-ray source for WAXS and SAXS. These nanocomposites can be used as transparent coatings, strong films or membranes, as gas barriers or in laminated form. CNF nanofibrils with random in-plane orientation, form a continuous non-porous matrix with GO platelets oriented in-plane. GO reinforcement mechanisms in CNF are investigated, and relationships between nanostructure and suspension rheology, mechanical properties, optical transmittance and oxygen barrier properties are investigated as a function of GO content. A much higher modulus reinforcement efficiency is observed than in previous polymer-GO studies. The absolute values for modulus and ultimate strength are as high as 17 GPa and 250 MPa at a GO content as small as 0.07 vol%. The remarkable reinforcement efficiency is due to improved organization of the CNF matrix; and this GO-induced mechanism is of general interest for nanostructural tailoring of CNF-2D nanoplatelet composites.
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| 7. |
- Mianehrow, Hanieh, et al.
(författare)
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Strong reinforcement effects in 2D cellulose nanofibril–graphene oxide (CNF–GO) nanocomposites due to GO-induced CNF ordering
- 2020
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Ingår i: Journal of Materials Chemistry A. - 2050-7488 .- 2050-7496. ; 8:34, s. 17608-17620
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Tidskriftsartikel (refereegranskat)abstract
- Nanocomposites from native cellulose with low 2D nanoplatelet content are of interest as sustainable materials combining functional and structural performance. Cellulose nanofibril–graphene oxide (CNF–GO) nanocomposite films are prepared by a physical mixing–drying method, with a focus on low GO content, the use of very large GO platelets (2–45 μm) and nanostructural characterization using synchrotron X-ray source for WAXS and SAXS. These nanocomposites can be used as transparent coatings, strong films or membranes, as gas barriers or in laminated form. CNF nanofibrils with random in-plane orientation, form a continuous non-porous matrix with GO platelets oriented in-plane. GO reinforcement mechanisms in CNF are investigated, and relationships between nanostructure and suspension rheology, mechanical properties, optical transmittance and oxygen barrier properties are investigated as a function of GO content. A much higher modulus reinforcement efficiency is observed than in previous polymer–GO studies. The absolute values for modulus and ultimate strength are as high as 17 GPa and 250 MPa at a GO content as small as 0.07 vol%. The remarkable reinforcement efficiency is due to improved organization of the CNF matrix; and this GO-induced mechanism is of general interest for nanostructural tailoring of CNF-2D nanoplatelet composites.
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| 8. |
- Mianehrow, Hanieh
(författare)
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Two-dimensional Nanocomposites Based on Cellulose Nanofibrils and Graphene Oxide
- 2022
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- Two-dimensional (2D) nanocomposites based on cellulose nanofibrils (CNF) and 2D nanomaterials are of interest as sustainable materials combining functional and structural properties. To achieve reinforcement effects from 2D nanomaterials, their orientation and dispersion state in the CNF matrix are important. In this thesis, nanocomposites based on CNF and graphene oxide (GO) platelets are investigated. The focus is on understanding nanostructure-property relationships, reinforcement mechanisms and interfacial molecular interactions. For this purpose, experimental investigations are combined with molecular dynamics (MD) simulations. CNF-GO nanocomposite nanopapers with different GO content are prepared using vacuum filtration of stable hydrocolloid dispersions, followed by drying. Nanostructure and physical and mechanical properties are investigated. Even a small, “homeopathic” amount of large aspect ratio GO platelets (0.07 vol%) is shown to induce ordering in the CNF matrix resulting in strong property improvement. In order to add an additional functionality to such nanocomposites, the GO in CNF-GO wet cake (after vacuum filtration) is chemically reduced to reduced graphene oxide (RGO). The main idea is to preserve the homogeneous distribution of GO in the CNF matrix and then reduce GO to RGO to achieve electrical conductivity together with mechanical reinforcement. The mechanical properties are very high. Effects from moisture on the mechanical performance of CNF-RGO nanocomposite are also studied and compared to CNF-GO and neat CNF films. Although CNF-GO adsorbs more moisture, it shows higher tensile strength at 90% relative humidity (RH) compared to CNF-RGO and neat CNF. Moisture effects on molecular interactions at CNF-GO interface were further studied by MD simulations. Dry interfaces are formed even in water-soaked conditions. The reason is that the system gains entropy as trapped interfacial water diffuses to form bulk water. The CNF-GO interface shows higher interfacial shear strength than CNF-graphene or RGO, because of higher hydrogen bond density. This may contribute to the higher strength for CNF-GO compared with CNF-RGO, despite higher moisture content for CNF-GO at 90% RH.
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