Article
Construction & Building Technology
Bahadir Yilmaz, Nuray Ugurlu
Summary: This study investigated the effects of adding magnesium lignosulfonate (MLS), an organic waste material from paper production, to asphalt binder. Different percentages of MLS (2%, 4%, 6%, and 8% by weight) were added to B50/70 penetration grade asphalt. SEM, FT-IR, and TG/DTG were used to analyze the morphology, modification mechanism, and thermal decomposition of the modified asphalt binders. Penetration, softening point, RTFOT, DSR, and RV experiments were conducted to determine the physical and rheological properties of the modified asphalt. The results showed that adding MLS improved the consistency, rutting resistance, and short-term aging resistance of the asphalt, while reducing its temperature sensitivity.
ROAD MATERIALS AND PAVEMENT DESIGN
(2023)
Article
Engineering, Manufacturing
Ivan Rivet, Narges Dialami, Miguel Cervera, Michele Chiumenti, Quino Valverde
Summary: This work presents an end-to-end optimization procedure for maximizing the mechanical performance of Additive Manufacturing (AM) components. The proposed methodology is applicable to various AM processes by using G-Code format for the manufacturing toolpaths. A two-step optimization process is driven by the methodology to select the optimal printing orientation. The approach enhances the accuracy of simulations compared to traditional STL-based methods.
ADDITIVE MANUFACTURING
(2023)
Review
Polymer Science
Yufan Zheng, Wenkang Zhang, David Moises Baca Lopez, Rafiq Ahmad
Summary: This study provides a comprehensive overview of the current research status and future challenges in multi-material additive manufacturing of polymers through scientometric analysis and systematic review. The research identifies key research trends and highlights the importance of developing technologies in this field, offering valuable insights for practitioners and researchers to guide future research directions.
Article
Engineering, Manufacturing
Luis Javier Segura, Zebin Li, Chi Zhou, Hongyue Sun
Summary: The Material Jetting (MJ) process is able to produce high-resolution structures in additive manufacturing. However, achieving consistent and stable droplet morphology and behavior in MJ printing is challenging due to the sensitivity of droplets to different material and process parameters. Therefore, we propose a method to predict droplet behaviors under various material and process parameters by leveraging the underlying relationships among droplet evolution behaviors and capturing them with the Network of Tensor Time Series (NET3). The proposed methodology, utilizing Tensor Graph Convolutional Network (TGCN), Tensor Recurrent Neural Network (TRNN), and Multilayer Perceptron (MLP), is demonstrated to accurately and efficiently predict droplet behaviors for both seen and unseen material/process parameters.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Ross Johnston, Zafer Kazanci
Summary: This study compares the effects of different material combinations on the performance of cellular structures, finding that single-material structures perform best in single loading cycle situations, while multi-material structures are suitable for situations requiring multiple loading cycles. Introducing materials with varying stiffnesses into specific regions within the structure can modify the Poisson's ratio during compression, improving overall performance.
ADDITIVE MANUFACTURING
(2021)
Article
Thermodynamics
Mengying Liu
Summary: In order to improve the performance of aluminized propellants, the mechanism of agglomeration needs to be studied and methods of inhibiting agglomeration need to be approved. In this study, organic fluoride was added to the propellants and the dynamic combustion process was observed using a visual combustion test system. The agglomeration behaviors and size distribution of initial and final condensed products during combustion were discussed. The addition of organic fluoride led to the formation of flocculent products instead of coral-like products and the presence of AlF3 in the condensed products. The distribution of the initial products was relatively concentrated and stable, while the final products showed an increasing, then decreasing trend before stabilizing. Moreover, the addition of organic fluoride converted the main combustion products from alpha-Al2O3 and theta-Al2O3 to gamma-Al2O3 and delta-Al2O3, indicating improved performance in suppressing the size of the condensed products.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Lei Di, Yiran Yang
Summary: This research proposes and implements an assessment framework to evaluate the recyclability of acrylonitrile butadiene styrene in extrusion-based AM, and studies the impact of different process parameters on material recyclability in each round. The experimental results show that the ultimate tensile strength degradation after each recycling round varies from 27% to over 50%; surface roughness increases 29.54% after three rounds of recycling; molecular weight distribution of recycled materials demonstrates obvious shifts, and the polydispersity is decreased by 13.16% after three rounds of recycling.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Green & Sustainable Science & Technology
Rohit Agrawal
Summary: The world is facing resource scarcity and increased material costs, while Additive Manufacturing (AM) revolutionizes manufacturing processes. Material selection is crucial for AM, and Multi-Criteria Decision Making (MCDM) methods can effectively manage sustainable material selection complexities. The study identifies "TPU Elastomer," "Accura HPC0," and "Duraform EX0" as the best materials for FDM, SLA, and SLS based on AM technologies.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Chemistry, Physical
Huijuan Shi, Yunzhi Tang, Yuhui Tan, Zhen Sun
Summary: This paper establishes a linear relationship between absorbency and the concentration of organic additives using ultraviolet spectrophotometry and the luminescence mechanism, and eliminates the interference of copper and hydrogen ions in the plating solution. Quantitative analysis of polyethylene glycol (PEG), bis-(sodium sulfopropyl)-disulfide (SPS), and gelatin concentrations in the solution is achieved. The method shows high accuracy and sensitivity, with low detection limits for all three additives.
CHEMICAL PHYSICS LETTERS
(2023)
Article
Engineering, Manufacturing
Brandon Hayes, Travis Hainsworth, Robert MacCurdy
Summary: This study extensively characterizes a liquid-solid co-printing process in multi-material material jetting additive manufacturing. The mechanism of this process is explained through experimental high speed imaging and computational fluid dynamic studies. Design rules for liquid-solid co-printing of micro/mesofluidic devices are presented, and case studies of various structures are shown. The liquid-solid co-printing process is considered a key new capability in additive manufacturing for the simple and rapid fabrication of integrated multi-material fluidic circuits and hydraulic structures.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Peixin He, Cheng Sun, Yun Wang
Summary: Laser powder bed fusion (LPBF) technology has attracted significant research attention, but may lead to residual stress and deformation during manufacturing, which needs to be addressed by studying influencing factors. This study conducted a three-dimensional numerical analysis of residual stress and deformation in fuel cell inlet/outlet fittings, revealing significant impacts of different materials and manufacturing parameters on distortion.
ADDITIVE MANUFACTURING
(2021)
Article
Polymer Science
Danfis D. Karamov, Azat F. Galiev, Alexey A. Lachinov, Khalim I. Davlyatgareev, Sergey N. Salazkin, Artur R. Yakhin, Alexey N. Lachinov
Summary: Conjugated conductive polymers are widely used in organic electronics, while non-conjugated polymers are mainly used as insulation materials or for capacitors. However, non-conjugated polymers have a wider potential for creating electronic materials with unique properties. This article demonstrates the creation of electrically conductive materials based on non-conjugated polymers and explores their practical applications. The study shows that abnormal electronic properties can be achieved along the interface of polymer dielectrics with functional polar groups.
Article
Chemistry, Multidisciplinary
Da Jung Park, Myeongjin Han, Mi Jung Park, Joo-Yul Lee, Seunghoe Choe
Summary: This study reveals that trace amounts of chloride ions in the electroplating bath are the source of active chlorine species that accelerate the breakdown at the insoluble anode. A sacrificial perfluorinated polymer coating effectively reduces the emission of active chlorine species from the electrode, thereby decreasing the consumption of brightener during Cu electrodeposition.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2022)
Article
Chemistry, Analytical
Eman A. Bahgat, Manal S. Elmasry, Rania A. Sayed
Summary: Antimicrobial resistance is a global issue that has caused increased mortality rates. Combination therapy with different action modes, including Ciprofloxacin, Tinidazole, Dexamethasone Sodium Phosphate, Diloxanide Furoate, and Metronidazole, has been used to overcome this problem. A new green micellar organic solvent-free HPLC methodology has been developed to simultaneously analyze these drugs in both their authentic forms and combined pharmaceutical formulations.
MICROCHEMICAL JOURNAL
(2023)
Article
Polymer Science
Pablo Zapico, Pablo Rodriguez-Gonzalez, Pablo Robles-Valero, Ana Isabel Fernandez-Abia, Joaquin Barreiro
Summary: The complexity and material compatibility of 3D printing create a new paradigm in design and manufacturing. However, standardization is lacking, necessitating characterization studies to fully utilize the advantages in functional parts. Post-processing is crucial for part finishing, and different methods can affect part quality similar to other process parameters.