Article
Engineering, Manufacturing
Fabio Caltanissetta, Gregory Dreifus, Anastasios John Hart, Bianca Maria Colosimo
Summary: This paper presents a data-driven methodology for in-situ monitoring of thermal profiles in the 3D printing process. It also proposes a novel approach to automatically detect local temperature inhomogeneities. The effectiveness of these methods is demonstrated through a real case study in the field of Big Area Additive Manufacturing (BAAM).
ADDITIVE MANUFACTURING
(2022)
Article
Polymer Science
Xin Jiang, Ryo Koike
Summary: Polymer science is crucial in understanding and studying material extrusion processes in additive manufacturing. This study investigated the impact of high-gravity conditions on material extrusion and conducted a numerical study using a high-gravity material extrusion system (HG-MEX). By analyzing the interplay between polymer behavior and gravity, insights into the effects of high gravity on filament flow, material deposition, and fabrication characteristics were provided. The established numerical study of high-gravity material extrusion is a meaningful approach for improving the quality and efficiency of additive manufacturing.
Review
Engineering, Manufacturing
Zahra Lotfizarei, Amir Mostafapour, Ahmed Barari, Alireza Jalili, Albert E. Patterson
Summary: Material extrusion additive manufacturing (MEAM) is a common process for building solid geometry using selective extrusion of molten material. One emerging process within this group is powder material extrusion (PME), which extrudes feedstock consisting of metal or ceramic powder suspended in a thermoplastic matrix. PME offers low cost, simple equipment, and lack of industrial hazards and residual stresses.
ADDITIVE MANUFACTURING
(2023)
Article
Materials Science, Multidisciplinary
Yifan Zhang, Dingding Xu, Lifeng Yuan, Qingqing Gao, Qiang Yu, Jiangang Chen, Yuchuan Cheng, Aihua Sun, Gaojie Xu, Jianjun Guo
Summary: This study investigates the influence of exfoliation degree of 2D materials on the performance of MEX-3DP nanocomposites. By using a model material, it is discovered that a high exfoliation degree is crucial for improving the mechanical properties and compensating for weak interfacial bonding. These findings are significant for the design of functional 2D materials using MEX-3DP.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Manufacturing
Marcelo Okada Shigueoka, Neri Volpato
Summary: The study focuses on the design and manufacturing of porous structures of porous materials based on advanced filling strategies, using material extrusion AM technology. By introducing new filling methods, various PM structures have been successfully created, expanding the design possibilities.
ADDITIVE MANUFACTURING
(2021)
Article
Polymer Science
Mahrukh Sadaf, Santiago Cano, Joamin Gonzalez-Gutierrez, Mario Bragaglia, Stephan Schuschnigg, Christian Kukla, Clemens Holzer, Lilla Valy, Michael Kitzmantel, Francesca Nanni
Summary: This work aims to understand the type of thermoplastic binders needed to produce highly loaded copper filaments for low-cost filament-based material extrusion (MEX). Through experimentation, printable filaments with good surface quality and low ovality were produced. The mechanical properties and viscosity of the feedstock were sufficient to ensure proper feeding and continuous extrusion. As the printing speed increased, the porosity of the printed parts decreased, improving the overall quality.
Article
Mechanics
Saveria Spiller, Sondre Olsoybakk Kolstad, Nima Razavi
Summary: The fatigue life of 316L components fabricated via MEAM is lower compared to wrought 316L, as internal defects from the deposition strategy result in observed crack initiation sites.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Polymer Science
Mihaela-Raluca Condruz, Alexandru Paraschiv, Teodor-Adrian Badea, Daniel Useriu, Tiberius-Florian Frigioescu, Gabriel Badea, Grigore Cican
Summary: The present research aimed to study the mechanical properties of three commercially available thermoplastic-based materials used in additive manufacturing. The motivation for this study was the limited information in literature regarding the materials' properties, inconsistencies between the properties and technical datasheets, and the anisotropic behavior of additively manufactured materials. Extensive tests were conducted on the tensile and flexural properties of the materials, and the best mechanical performance was found in UltraFuse PAHT CF15.
Article
Engineering, Manufacturing
David W. W. Collinson, Natalia von Windheim, Ken Gall, L. Catherine Brinson
Summary: Poly(ether ether ketone) (PEEK) is a high-performance thermoplastic material that is suitable for material extrusion additive manufacturing techniques. However, the weld strength of FFF-PEEK is poor. By controlling the processing conditions and post-print annealing conditions, the weld strength of FFF-PEEK can be improved.
ADDITIVE MANUFACTURING
(2022)
Article
Polymer Science
Maria Camila Montoya-Ospina, Jiachen Zeng, Xiao Tan, Tim A. Osswald
Summary: Polyethylene (PE) presents challenges in extrusion-based additive manufacturing (AM) due to low self-adhesion and shrinkage. This study successfully processed high-density polyethylene (HDPE) and HDPE vitrimers (HDPE-V) using a screw-assisted 3D printer. HDPE-V reduced shrinkage during printing and showed better dimensional stability compared to regular HDPE. Annealing the 3D-printed HDPE-V samples decreased mechanical anisotropy, which was only possible due to their superior dimensional stability at elevated temperatures.
Article
Materials Science, Multidisciplinary
Juhyeong Lee, Rebecca Ruckdashel, Nikhil Patil, Michael Pugatch, Kartik Joshi, Jay Hoon Park
Summary: In this study, a highly filled core-shell dual-layer filament was designed to overcome the challenges of highly filled composite filaments and maximize their advantages. The fabricated filaments showed improved tensile strength, anisotropy, and visual gloss compared to the monolayer filament.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Engineering, Manufacturing
Amir Hadian, Benjamin Morath, Manuel Biedermann, Mirko Meboldt, Frank Clemens
Summary: Recent developments in material extrusion-based additive manufacturing (MEX-AM) have enabled the production of complex-shaped ceramic parts. However, there is limited research on the design limits of 3D printed structures using MEX-AM and post-processing steps. This study presents a set of design rules for fabricating alumina parts considering these restrictions, based on geometric test specimens and printed structures.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Manufacturing
Luca Grigolato, Stefano Rosso, Roberto Meneghello, Gianmaria Concheri, Gianpaolo Savio
Summary: This study proposes a method for fabricating graded density shell-based lattice structures in MEX technology by combining geometric modeling and CAM processing. Experimental results show that the method can reduce design efforts and processing time, while obtaining consistent components.
ADDITIVE MANUFACTURING
(2022)
Article
Engineering, Manufacturing
Daniel A. Rau, Michael J. Bortner, Christopher B. Williams
Summary: A Rheology Roadmap is proposed in this study to guide material designers in evaluating the printability of inks in Chemical Reaction Bonding Material Extrusion Additive Manufacturing. By conducting rheology experiments and using a standardized approach, users can assess the printability of new inks and facilitate the development of the next generation of MEX materials.
ADDITIVE MANUFACTURING
(2023)
Article
Chemistry, Physical
Gerardo Andres Mazzei Capote, Maria Camila Montoya-Ospina, Zijie Liu, Michael Sabatini Mattei, Boyuan Liu, Aidan P. Delgado, Zongfu Yu, Randall H. Goldsmith, Tim Andreas Osswald
Summary: Additive manufacturing techniques, specifically polymer extrusion-based AM, were used to produce high-permittivity materials for constructing 3D microwave photonic structures. The resulting thermoplastic composite had the highest permittivity ever demonstrated in a thermoplastic AM composite at microwave frequencies. This study highlights the potential of AM for creating complex geometries and optimizing material properties.
Article
Materials Science, Composites
Yanmei Piao, Vipin N. Tondare, Chelsea S. Davis, Justin M. Gorham, Elijah J. Petersen, Jeffrey W. Gilman, Keana Scott, Andras E. Vladar, Angela R. Hight Walker
Summary: This study evaluated the effectiveness of XPS, Raman spectroscopy, and SEM methods on MWCNT-epoxy nanocomposite samples, finding a positive correlation between signal intensity and MWCNT mass loading. The results showed that these methods were capable of detecting MWCNTs at different concentrations and demonstrated good comparability among them.
COMPOSITES SCIENCE AND TECHNOLOGY
(2021)
Article
Materials Science, Paper & Wood
Sami M. El Awad Azrak, Jared A. Gohl, Robert J. Moon, Gregory T. Schueneman, Chelsea S. Davis, Jeffrey P. Youngblood
Summary: This study investigated the redispersion and setting behavior of highly loaded pastes of cellulose nanofibrils with carboxymethyl cellulose under different chemical treatments. Analysis using turbidity and FTIR showed significant effects of different treatments on the properties of nanofibril pastes.
Article
Materials Science, Multidisciplinary
J. A. Gohl, T. C. Thiele-Sardina, M. L. Rencheck, K. A. Erk, C. S. Davis
Summary: A modular peel fixture was developed to conduct peel experiments directly on immovable substrates. The fixture was validated through peel tests on consumer tapes, reproducing the linear width dependence and viscoelastic rate dependence found in traditional setups. This fixture shows potential for both traditional peeling tests and in-situ peel experiments on substrates relevant to the end application of the PSA tape.
EXPERIMENTAL MECHANICS
(2021)
Article
Engineering, Biomedical
Mehdi Shishehbor, Hyeyoung Son, Md Nuruddin, Jeffrey P. Youngblood, Chelsea Davis, Pablo D. Zavattieri
Summary: The mechanical properties of cellulose nanocrystal films are critically dependent on factors such as fiber length distribution, orientation distribution, and interactions between fibers. Adhesion strength is found to be the key parameter that significantly improves mechanical properties.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2021)
Article
Nanoscience & Nanotechnology
Chelsea S. Davis, Mitchell L. Rencheck, Jeremiah W. Woodcock, Ryan Beams, Muzhou Wang, Stephan Stranick, Aaron M. Forster, Jeffrey W. Gilman
Summary: Investigating scratch damage in polymer coatings using fluorescence lifetime imaging microscopy (FLIM) and mechanically activated mechanophores (MP) in epoxy coatings allows for the detection of microscale scratches and molecular scale changes. The fluorescence behavior of activated MPs can be utilized to identify ductile and fracture-dominated processes during scratch application, providing additional insights into local environments and molecular structures. The approach of using mechanophores and scratch deformation enhances the optical characterization of damage zones and leads to novel defect detection strategies.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Mitchell L. Rencheck, Brandon T. Mackey, Yu-Yang Hu, Chia-Chih Chang, Michael D. Sangid, Chelsea S. Davis
Summary: This study presents a method to calibrate the intensity of MP fluorescent activation with local hydrostatic stresses. By monitoring the fluorescence intensity during quasi-static deformation and using finite element analysis, a linear relationship between the intensity and local hydrostatic stresses is established, which can be applied to many MP-containing materials systems for calibration.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Engineering, Chemical
Hyeyoung Son, Kendra A. Erk, Chelsea S. Davis
Summary: The adhesion of temporary pavement marking (TPM) tapes is crucial for road construction traffic safety. Testing the viscoelastic properties and peel force of different brands of TPM tapes can determine the effective operating temperature range for each tape.
JOURNAL OF ADHESION
(2023)
Article
Engineering, Civil
Hyungyung Jo, Matthew Giroux, Kendra A. Erk, Chelsea S. Davis
Summary: This study investigates the mechanical performance and adhesion properties of permanent pavement markings (PPMs) through mechanical tests and shear adhesion testing. The results show that the intrinsic materials properties of PPMs have a significant impact on their mechanical performance and adhesion properties. PPM materials with lower modulus and higher deformation energy exhibit better adhesion performance on asphalt road surfaces.
TRANSPORTATION RESEARCH RECORD
(2022)
Article
Materials Science, Multidisciplinary
Nolan A. Miller, Zhaofan Li, Wenjie Xia, Chelsea S. Davis
Summary: Bioderived materials are increasingly favored over nonrenewable resources. This study explores the use of cellulose nanocrystals (CNCs) to manufacture thin films and investigates the mechanical properties of these films. The results indicate that the modulus of the film is higher when the CNC particles are aligned parallel to the compression direction.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Naomi Deneke, Jamie A. Booth, Edwin P. Chan, Chelsea S. Davis
Summary: In this study, a pressure-tunable adhesive (PTA) based on self-assembly of microscale asperities was developed to achieve controllable adhesion strength. The adhesion strength of the PTA can be increased by applying compressive preload, and the pull-off force can be controlled by adjusting the preload. This approach is scalable and applicable to different material systems.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Laura O. Williams, Emmanuel K. Nava, Anni Shi, Tyler J. Roberts, Chelsea S. Davis, Shelley A. Claridge
Summary: Controlling the surface chemistry of elastomers, such as PDMS, is crucial for various applications. However, achieving nanostructured chemical control on amorphous material interfaces below the length scale of substrate heterogeneity is not easy, and is particularly challenging to separate from changes in network structure. A new method for precisely structured surface functionalization of soft materials, including PDMS, has been developed, maximizing steric accessibility. This provides a foundation for generating nanometer-scale functional patterns on PDMS with varying elastic moduli, which is important for applications like cell culture.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Polymer Science
Nazmul Haque, Jared Gohl, Chia-Chih Chang, Hao Chun Chang, Chelsea S. Davis
Summary: This study demonstrates the visualization of stress distribution during loading in a single fiber-reinforced framework by embedding spiropyran mechanophores within a PDMS matrix. The activation of mechanophores allows for the concentration of stresses to be observed, with higher stress concentrations near the fiber region. Fluorescence microscopy and finite element modeling are used to quantitatively assess stress and develop a calibration for stress quantification based on fluorescence intensity.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Hyeyoung Son, Dawson Michael Smith, Zhaofan Li, Taehoo Chang, Wenjie Xia, Chelsea Simone Davis
Summary: Cellulose nanocrystal (CNC) thin films are sustainable materials with anisotropic mechanical properties. The fracture mechanisms and modulus of CNC films are found to be dependent on particle alignment with respect to the loading direction. A new experimental method was developed to measure the mechanical anisotropy of thin CNC films by observing the wavelength of wrinkles formed during uniaxial tensile strain. The elastic modulus of CNC films decayed exponentially with increasing misalignment angle to the loading direction, and the fracture mechanism was observed to depend on the misalignment angle through coarse-grained modeling.
MATERIALS ADVANCES
(2023)
Article
Chemistry, Physical
Naomi Deneke, Allison L. Chau, Chelsea S. Davis
Summary: The ability to control adhesion is crucial in various technologies, and this study investigates using polymer thin film dewetting as a surface modification tool. The research finds that by thermally annealing polystyrene thin films on a polydimethylsiloxane substrate, microscopic asperities can be formed, affecting adhesion properties. The study also reveals a pressure-dependent adhesive response on surfaces covered with the smallest asperities.
Review
Chemistry, Physical
Naomi Deneke, Mitchell L. Rencheck, Chelsea S. Davis
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.