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Materials & Design 51건

  1. [해외논문]   Editorial Board   SCIE


    Materials & Design v.117 ,pp. IFC - IFC , 2017 , 0264-1275 ,

    초록

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  2. [해외논문]   Polyglycerol-based organic-inorganic hybrid adhesive with high early strength   SCIE

    Yang, Zhengpeng (Corresponding author.) , Zhang, Xuefeng , Liu, Xuan , Guan, Xuemao , Zhang, Chunjing , Niu, Yutao
    Materials & Design v.117 ,pp. 1 - 6 , 2017 , 0264-1275 ,

    초록

    Abstract The rapid achievement of high strength adhesive is of ever increasing importance for underground construction. Herein, a simple and effective strategy to make an adhesive in a “high early strength” way was based on excellent crosslinking and synergistic interactions among tripolyglycerol, waterglass and polyaryl polymethylene isocyanate (PAPI). The resultant organic-inorganic hybrid adhesive with three-dimensional interpenetrating network structure showed an excellent mechanical performance, the compressive strength could reach more than 50 and 60MPa after curing for 2 and 4h, respectively. The adhesive was mainly composed of amorphous polyurethane and crystalline polysilicic acid/NaHCO 3 composite, and its probable formation mechanism was proposed. Furthermore, the adhesive was thermally stable below 260°C and presented a favorable adhesion performance for dry/wet sands with various sizes. This work may open a simple and convenient avenue for the preparation of organic-inorganic hybrid adhesive with high early strength. Highlights Polyglycerol-based organic-inorganic hybrid adhesive was prepared via a simple and effective strategy. The adhesive showed a high early strength of 50MPa after curing for 2h. A probable formation mechanism of adhesive was proposed. The adhesive exhibited excellent thermostability and adhesion performance. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  3. [해외논문]   On the investigation of self-healing behavior of bitumen and its influencing factors   SCIE

    Lv, Quan (Corresponding author.) , Huang, Weidong , Zhu, Xingyi , Xiao, Feipeng
    Materials & Design v.117 ,pp. 7 - 17 , 2017 , 0264-1275 ,

    초록

    Abstract Bitumen, which combines individual aggregate particles, is crucial in the self-healing of asphalt materials. However, the underlying mechanism and influencing factors of self-healing remain ambiguous. In this study, the effects of different factors were investigated using a multi-failure-healing cycle test based on the Binder Bond Strength (BBS) test. Then, Computed Tomography scan (CT-scan) test was performed to visually confirm the results of the BBS test. Results indicate that bond strength recovery displays various patterns over time under different conditions. What is unexpected is that the water exerts multiple effects on the healing potential of bitumen, although it negatively influences the healing capability of this material over time. In addition, the healing capability of bitumen continuously increases with healing temperature. The result of CT-scan test further confirms this phenomenon and indicates that healing temperature is more important than healing time. As for the aging process, it elicits different effects on the base bitumen and modified binder. Both the BBS test and CT-scan test show the negative effect of Styrene–Butadiene–Styrene (SBS) modifier on the healing potential of the base bitumen. Moreover, CT-scanned images reveal that three healing stages can be suggested to interpret the healing behavior: gathering, moving, and rounding. Highlights The multiple effects of water on the healing potential of bitumen were observed. Healing temperature is more important than healing time in bond strength recovery. Modifiers can affect the healing performance of bitumen. SBS modifier has the negative effect on the healing potential of the base bitumen. Aging process exerts distinct impacts on the base bitumen and modified binder. Three healing stages were suggested to interpret the healing behavior of bitumen: gathering, moving and rounding. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  4. [해외논문]   Three-dimensional graphene network/phenolic resin composites towards tunable and weakly negative permittivity   SCIE

    Wu, Haikun (Corresponding authors. ) , Yin, Rui (Corresponding authors.) , Qian, Lei , Zhang, Zidong
    Materials & Design v.117 ,pp. 18 - 23 , 2017 , 0264-1275 ,

    초록

    Abstract Three-dimensional (3D) graphene (GR) network/phenolic resin composites with tunable and weakly negative permittivity were prepared by mechanical mixed method. Dielectric properties including permittivity, dielectric loss tangent and alternating current conductivity ( σ ac ), were investigated in detail. When the GR content was increased from 8 to 13vol%, a ladder-shape increase of σ ac was observed, indicating a percolation phenomenon. It was found that, when the GR content exceeded 13vol% the negative permittivity appeared attributed to the formation of 3D interconnected GR network. Moreover, the negative permittivity was easily adjusted by controlling the GR content. Compared with the metal-ceramics in our previous work, the absolute values of negative permittivity were low, which was in favor of impedance matching. For the GR content of 13vol%, high dielectric loss above 25 over the whole frequency was also observed. Finally, the equivalent circuits were used to analyze the reason of the negative permittivity. Highlights Weakly negative permittivity was first obtained from the graphene composites. Negative permittivity resulted from formation of graphene conductive networks. Negative permittivity was easily adjusted by controlling the graphene contents. High dielectric loss (above 25) was obtained from 13vol% graphene. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  5. [해외논문]   New approach to morphological control for polypropylene/polyethylene blends via magnetic self-organization   SCIE

    Shi, Yu-Dong (Corresponding author.) , Zhang, Kai , Chen, Yi-Fu , Zeng, Jian-Bing , Wang, Ming
    Materials & Design v.117 ,pp. 24 - 36 , 2017 , 0264-1275 ,

    초록

    Abstract Morphological control has been efficiently used to improve the properties of polymer blends/composites. Here we introduce a non-invasive approach to regulate the morphologies of isotactic polypropylene (iPP)/linear low density polyethylene (LLDPE) blends via magnetic self-organization. First, ferric oxide (Fe 3 O 4 ) particles are added into LLDPE melts to form an LLDPE+Fe 3 O 4 master batch. Second, the master batch is melt-mixed with iPP to form the iPP/(LLDPE+Fe 3 O 4 ) composites with a random distribution of LLDPE+Fe 3 O 4 droplets. Finally, the randomly distributed Fe 3 O 4 particles self-organize into particle chains in a magnetic field, which induce LLDPE droplets to coalesce with each other to form a strip morphology. The composites with a parallel strip morphology exhibited mechanical enhancement in comparison to the composites with the droplet morphology. For example, the Young's modulus and storage moduli (at −30°C) of the 80/20–10 composites, where the iPP/(LLDPE+Fe 3 O 4 ) ratio is 80/20, and the content of Fe 3 O 4 particles in LLDPE is 10wt%, with a parallel strip morphology along the tensile direction being 12 and 36% higher than that of the samples with the droplet morphology, respectively. Complex viscosity of the samples with the strip morphology is lower than that of the samples with the droplet morphology because of interfacial slip. Highlights Morphological control can be easily achieved in iPP/(LLDPE+Fe 3 O 4 ) composites by magnetic self-organization. Alignment of Fe 3 O 4 particles induces LLDPE droplets that coalesce with each other to form a strip morphology in iPP matrix. iPP/(LLDPE+Fe 3 O 4 ) composites with the strip morphology show obviously mechanical enhancement. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   The loading-rate dependent tensile behavior of CNT film and its bismaleimide composite film   SCIE

    Zhang, Mengsi (Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China ) , Li, Min (Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China ) , Wang, Shaokai (Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China ) , Wang, Yanjie (Key Laboratory of Aerospace Advanced Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Haidian District, Beijing 100191, China ) , Zhang, Yongyi (Suzhou Institute of Nano-tech and Nano-bionics, No. 398 Ruoshui Road, Suzhou 215123, China ) , Gu, Yizhuo (Key Laboratory of Aerospace Advanced Materi) , Li, Qingwen , Zhang, Zuoguang
    Materials & Design v.117 ,pp. 37 - 46 , 2017 , 0264-1275 ,

    초록

    Abstract Carbon nanotube (CNT) macroscopic assembly, as a promising candidate for the protective and anti-collision materials, has attracted lots of researchers to explore its mechanical behavior under different loading rates. In this paper, the loading-rate dependent mechanical behavior of CNT film and its composite with bismaleimide (BMI) matrix is investigated. The pristine CNT film shows decreased tensile strength by 33.8% when the loading rate increases from 0.05mm/min to 40mm/min. An obvious necking extending phenomenon is observed in the CNT film during the tensile test under lower tensile rates, e.g. 0.05mm/min and 0.5mm/min. However, the random composite film and the oriented composite film both display increased tensile strength, by 58.2% and 35.7% respectively, with the increasing loading rate from 0.05mm/min to 40mm/min. The different loading-rate dependence of tensile behavior is ascribed to the different tensile-induced motions of CNTs and CNT bundles in composite film. Moreover, strain rate sensitivity coefficients of different film are calculated according to a simplified Johnson-Cook model. The results suggest that the pristine CNT film with the strain rate sensitivity coefficient of −0.0941 has a high loading-rate sensitivity, meanwhile polymer infiltration and oriented alignment can weaken the loading-rate sensitivity of CNT film. Highlights Tensile strength of the pristine CNT film decreases with loading rate increasing from 0.05mm/min to 40mm/min. The random CNT/BMI composite film and the oriented CNT/BMI composite film both exhibit a loading-rate strengthening effect. Polymer infiltration and oriented alignment of CNTs are found to weaken the loading-rate sensitivity of the CNT film. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  7. [해외논문]   Microstructural characterisation of a nickel alloy processed via blown powder direct laser deposition (DLD)   SCIE

    Jones, Jonathan (Institute of Structural Materials, Swansea University, Fabian Way, Swansea SA1 8EN, UK ) , Whittaker, Mark (Institute of Structural Materials, Swansea University, Fabian Way, Swansea SA1 8EN, UK ) , Buckingham, Ross (Institute of Structural Materials, Swansea University, Fabian Way, Swansea SA1 8EN, UK ) , Johnston, Richard (Institute of Structural Materials, Swansea University, Fabian Way, Swansea SA1 8EN, UK ) , Bache, Martin (Institute of Structural Materials, Swansea University, Fabian Way, Swansea SA1 8EN, UK ) , Clark, Daniel (Rolls-Royce plc, P.O. Box 31, Derby DE24 8BJ, UK)
    Materials & Design v.117 ,pp. 47 - 57 , 2017 , 0264-1275 ,

    초록

    Abstract A three dimensional structure of varying wall thickness has been manufactured from an alloy similar to 718 and subjected to metallographic characterisation. The technique is evaluated as a process capable of generating complex geometries. This can be used to add features or as a free form fabrication method. However, in order to allow for comparison to structures developed through more traditional techniques, detailed microstructural characterisation has been undertaken to attempt to understand the potential effect of variation on resultant mechanical properties. Samples were extracted from six locations with different wall thicknesses, intricate features and intersecting ligament geometry. A γ″ linearly arrayed structure within a γ matrix was consistent throughout the component. Micro-porosity was restricted to isolated, spherical pores A detailed comparison is also made between blown powder Direct Layer Deposition (DLD) and a similar deposition technique, shaped metal deposition (SMD). Blown powder DLD produces a smaller weld pool and results in a more consistent microstructure than SMD, with less evidence of unfavourable phases brought about by prolonged exposure to high temperatures. The improved microstructure, however, must be measured against the different process economics of the blown powder DLD technique. Highlights The novel manufacturing technique has proved capable of providing a consistent microstructure in a complex geometry. The blown powder DLD component showed low porosity, although isolated spherical micro-pores were found widely distributed. Microstructural consistency indicates that these techniques are applicable for appropriate structural geometries. Despite a high capital cost, flexibility is ensured favouring high performance additive manufacturing applications. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   Effect of full helmet systems on human head responses under blast loading   SCIE

    Rodrí (Department of Mechanical Engineering, University Carlos III of Madrid, Avda. de la Universidad 30, 28911 Leganés, Madrid, Spain ) , guez-Millá (Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore ) , n, M. (Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore ) , Tan, L.B (Department of Mechanical Engineering, National University of Singapore, 9 Engineering Drive 1, 117576, Singapore ) , Tse, K.M. (Department of Mechanical Engineering, University Carlos III of Madrid, Avda. de la Universidad 30, 28911 Leganés, Madrid, Spain) , Lee, H.P. , Migué , lez, M.H
    Materials & Design v.117 ,pp. 58 - 71 , 2017 , 0264-1275 ,

    초록

    Abstract This paper focuses on helmet design for head protection under blast threats. It is presented a numerical investigation of the head response accruing to blast loads on helmet protective systems. Various combinations of the helmet, visor and mandible guard were numerically analyzed for a given mass of TNT at a distance to the target representing an anti-vehicle buried mine threat. Limited published articles on the subject are available in the scientific literature. In this paper, a 3D head–helmet numerical model for blast analyses is developed in the finite element code ABAQUS/Explicit. The results showed that individual protective systems are not effective enough to mitigate the damage caused by blast loading. The complete protective equipment reduces the pressures on the brain by up to 5 times and ensures that no fracture in the skull appears. This numerical study aims to provide helmet manufacturers and users with some insight in what possible brain injuries are to be expected in various blast scenarios so as to help in better diagnosis of unsuspected brain injury. Highlights The effects of complementary systems added to the basic helmet configuration were numerically analyzed for a given mass of TNT. The protective equipment reduced brain pressures by 5 times and protected the head from skull fractures. Serious injuries may occur for the helmet with only one of the individual protective equipment Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  9. [해외논문]   Design and modeling of auxetic and hybrid honeycomb structures for in-plane property enhancement   SCIE

    Ingrole, Aniket (Corresponding author.) , Hao, Ayou , Liang, Richard
    Materials & Design v.117 ,pp. 72 - 83 , 2017 , 0264-1275 ,

    초록

    Abstract Honeycomb structures have been used extensively in lightweight sandwich structure and impact energy absorption applications. Recently the research has been carried out on auxetic honeycombs that have negative Poisson's ratio (NPR). Auxetic structures are attractive for various engineering applications because of their unique mechanical properties, volume change control and excellent impact energy absorption performance. In this study, novel design and performance improvement of new auxetic-strut structures were presented. A comparative study of in-plane uniaxial compression loading behavior of regular honeycomb, re-entrant auxetic honeycomb, locally reinforced auxetic-strut structure and a hybrid structure of combining regular honeycomb and auxetic-strut structure was conducted on 3D printed samples. The deformation and failure modes of the different cells were studied and their performance was also discussed. The new auxetic-strut structure showed better mechanical properties than the honeycomb and auxetic structure. For example, the compressive strength of the auxetic-strut design is ~300% more than that of honeycomb structure and ~65% more than that of auxetic structure. With lower values of the Poisson's ratio, the new design can absorb more energy when compared to the other structures. Hybrid structure of auxetic-strut and honeycomb cells allows us tailor the deformation paths to provide desired failure modes. Highlights The new design of auxetic-strut that has split vertical struts and two hybrid models with honeycomb cells was proposed. The specific energy absorbed by auxetic-strut structure is more than that of the regular structures. Deformation modes determine how the structures are going to collapse. Hybrid structures can allow controlling the collapse mechanism and location of the entire structure. Graphical abstract [DISPLAY OMISSION]

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  10. [해외논문]   Design and characterizations of novel biodegradable Zn-Cu-Mg alloys for potential biodegradable implants   SCIE

    Tang, Zibo (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China ) , Huang, Hua (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China ) , Niu, Jialin (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China ) , Zhang, Lei (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China ) , Zhang, Hua (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200240 Shanghai, China ) , Pei, Jia (National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong Unive) , Tan, Jinyun , Yuan, Guangyin
    Materials & Design v.117 ,pp. 84 - 94 , 2017 , 0264-1275 ,

    초록

    Abstract Zn-3Cu-xMg (x=0, 0.1, 0.5 and 1.0wt.%) alloys were developed as potential biodegradable metallic materials in this study. The mechanical properties, corrosion behavior and in vitro cytocompatibility of Zn-3Cu-xMg alloys were studied systematically to evaluate the feasibility as biodegradable implant materials. The secondary phase in as-cast and as-extruded Zn-3Cu alloy was CuZn 5 phase. Mg 2 Zn 11 phase newly formed and precipitated by Mg addition. The volume fraction of Mg 2 Zn 11 phase increased gradually with increasing Mg concentration. As a result, yield strength was improved from 213.7 to 426.7MPa and increased by 99.7% while elongation decreased from 47.1% to 0.9%. Besides, biocompatibility was improved apparently and in vitro corrosion rates increased from 11.4 to 43.2μmyear −1 , which is more suitable for clinic application. The present research indicated that the newly developed alloys could be promising candidates for biomedical use due to the proper mechanical properties, degradation rate and acceptable biocompatibility. Highlights Mg 2 Zn 11 phase newly forms and precipitates by adding Mg into Zn-Cu alloy. Yield strength increases by 99.7% with 1Mg addition, indicating obvious strengthening effect of Mg for Zn-3Cu alloy. Ranging from 11.4 to 43.2 μm year -1 , the degradation rates of Zn-3Cu-xMg alloys are more suitable for clinic application. The cytocompatibility of Zn-3Cu is enhanced apparently by Mg addition. Graphical abstract [DISPLAY OMISSION]

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