Article
Materials Science, Ceramics
Minhyeok Lee, Unseok Jung, Jong-Il Kim, Hyeondeok Jeong, Jaewoo Kim, Se Youn Moon, Se Gyu Jang, Sung-Soo Ryu, Seong Yun Kim, Hunsu Lee
Summary: Ultrahigh-temperature ceramics (UHTCs) are highly hard and resistant to oxidative ablation, suitable for hypersonic environments. However, their low fracture toughness limits their use. In this study, zirconium diboride was sintered with high aspect ratio boron nitride nanotubes (BNNTs) to improve fracture toughness. Plasma functionalization effectively disperses the BNNTs in UHTC, increasing the fracture toughness of the UHTC composite.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Chemical
Shuo Wang, Meng Cao, Fanglin Cong, Hongqian Xue, Xiaodong Li, Changbao Zhao, Xu Cui
Summary: This study developed composite adhesives with both excellent mechanical properties and thermal conductivity by packing graphene platelets and carbon nanotubes into epoxy/BN composites. The three-phase composite adhesive showed significantly improved fracture toughness, stress-energy release rate, and Young's modulus compared to traditional epoxy/BN composites, while also achieving high thermal conductivity.
JOURNAL OF ADHESION SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Applied
Takatoshi Yamada, Tomoaki Masuzawa, Yuki Okigawa
Summary: To enhance the carrier mobility and suppress the intrinsic carrier density of graphene on a silicon dioxide substrate, a potassium-doped nano graphene intermediate layer was introduced. Electrical properties of the fabricated graphene field-effect transistors were measured, and the results showed a shift in the Dirac point and increased carrier density and mobility. The ionized potassium atoms in the intermediate layer shielded the electric force from the negatively charged impurities, resulting in improved field-effect mobilities.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Multidisciplinary
Wengen Ouyang, Oded Hod, Michael Urbakh
Summary: The superlattice of alternating graphene/h-BN few-layered heterostructures is strongly influenced by the parity of the number of layers, resulting in different superlattice shapes and mechanical properties. The predicted phenomenon, originating from moire patterns at the interface of consecutive layers, is expected to occur in other closely matched rigid layered materials. This allows for the rational design of mechanomutable metamaterials based on van der Waals heterostructures.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Qingwei Yan, Jingyao Gao, Ding Chen, Peidi Tao, Lu Chen, Junfeng Ying, Xue Tan, Le Lv, Wen Dai, Fakhr E. Alam, Jinhong Yu, Yuezhong Wang, He Li, Chen Xue, Kazuhito Nishimura, Sudong Wu, Nan Jiang, Cheng-Te Lin
Summary: The mesoplasma chemical vapor deposition (CVD) technology was used to synthesize vertically aligned graphene nanowalls (GNWs) and achieve high thermal conductivity polymer composites with low filler loadings.
Article
Chemistry, Multidisciplinary
Bosai Lyu, Jiajun Chen, Shuo Lou, Can Li, Lu Qiu, Wengen Ouyang, Jingxu Xie, Izaac Mitchell, Tongyao Wu, Aolin Deng, Cheng Hu, Xianliang Zhou, Peiyue Shen, Saiqun Ma, Zhenghan Wu, Kenji Watanabe, Takashi Taniguchi, Xiaoqun Wang, Qi Liang, Jinfeng Jia, Michael Urbakh, Oded Hod, Feng Ding, Shiyong Wang, Zhiwen Shi
Summary: Graphene nanoribbons (GNRs) are promising materials for future nanoelectronic applications, but growing long GNRs on insulating substrates remains a challenge. This study reports the successful epitaxial growth of micrometer-long GNRs on an insulating substrate using nanoparticle-catalyzed chemical vapor deposition.
ADVANCED MATERIALS
(2022)
Article
Multidisciplinary Sciences
Y. Dong, L. Xiong, I. Y. Phinney, Z. Sun, R. Jing, A. S. McLeod, S. Zhang, S. Liu, F. L. Ruta, H. Gao, Z. Dong, R. Pan, J. H. Edgar, P. Jarillo-Herrero, L. S. Levitov, A. J. Millis, M. M. Fogler, D. A. Bandurin, D. N. Basov
Summary: The phenomenon of dragging light by moving media, predicted by Fresnel and verified by Fizeau, plays a key role in Einstein's special relativity theory. While experiments on dragging photons by an electron flow in solids have inconsistencies, the dragging of surface plasmon polaritons by an electron flow in graphene is a unique and complex phenomenon that challenges simple kinematics explanations.
Article
Materials Science, Multidisciplinary
Ana Cadena, Aron Pekker, Bea Botka, Erzsebet Dodony, Zsolt Fogarassy, Bela Pecz, Katalin Kamaras
Summary: Graphene nanoribbons were synthesized within boron nitride nanotubes by liquid phase encapsulation and subsequent annealing. The synthesized product was characterized using high-resolution transmission electron microscopy, optical absorption, and Raman spectroscopy. Carbon-containing material was detected inside the boron nitride nanotubes using energy-dispersive X-ray spectroscopy (EDS) and scanning transmission electron microscopy (STEM). Under the electron beam, the observed structures twisted and the characteristic features of nanoribbons appeared in the Raman spectra.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Article
Chemistry, Physical
Zhenbang Zhang, Maohua Li, Yandong Wang, Wen Dai, Linhong Li, Yapeng Chen, Xiangdong Kong, Kang Xu, Rongjie Yang, Ping Gong, Jianxiang Zhang, Tao Cai, Cheng-Te Lin, Kazuhito Nishimura, Hao Nan Li, Nan Jiang, Jinhong Yu
Summary: As power density increases in electronic devices, the need for high-performance thermal interface materials becomes more urgent. Scalable manufacturing of such materials at low cost remains challenging. In this study, a 3D printing method was proposed to align carbon fibers, resulting in thermal interface materials with high thermal conductivity and significantly improved cooling efficiency compared to advanced commercial materials. This work provides valuable insight into the design of highly thermally conductive composites and their practical applications in electronics thermal management.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Materials Science, Multidisciplinary
Liangxu Lin, Na Xu, Chang Wu, Juntong Huang, Andrew Nattestad, Xueling Zheng, Gordon G. Wallace, Shaowei Zhang, Jun Chen
Summary: This study reports a technique for preparing ultrathin crystals from bulk non-layered structures and characterizes their physical and optical properties. The novel 2D non-layered nanomaterials presented in this work provide significant contributions to the field and lay the foundation for more applications.
Article
Nanoscience & Nanotechnology
Shaoen Jin, Hang Zheng, Junyu Zong, Xuedong Xie, Fan Yu, Wang Chen, Libo Gao, Can Wang, Yi Zhang
Summary: The study demonstrates the etching growth mechanism of a h-BN film on graphene, showing the element composition, chemical bonding formation, and the formation of the new R0 degrees graphene through experiments and measurements. It provides a deeper understanding for further research on h-BN/graphene heterojunctions.
Article
Nanoscience & Nanotechnology
Hu Li, Jiawei Zhang, A. Baset Gholizadeh, Joseph Brownless, Yangming Fu, Wensi Cai, Yuanyuan Han, Tianbo Duan, Yiming Wang, Haotian Ling, Klaus Leifer, Richard Curry, Aimin Song
Summary: By longitudinally unzipping single-walled carbon nanotubes, ultranarrow and photoluminescent semiconducting GNRs have been synthesized with a band gap of 1.8 eV. These GNRs exhibit strong light-emitting properties and high carrier mobility, showing promise for applications in graphene-based electronics and optoelectronics.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Francesco Libbi, Nicola Bonini, Nicola Marzari
Summary: The study focuses on the importance of lattice dynamics and quadratic behavior of flexural acoustic modes in low-dimensional materials, and proposes a potential form that accurately reproduces phonon dispersions of graphene and carbon nanotubes. The potential can also estimate lattice thermal conductivity effectively.
Article
Materials Science, Multidisciplinary
Asia Matatyaho Ya'akobi, Cedric J. S. Ginestra, Lyndsey R. Scammell, Michael W. Smith, Matteo Pasquali, Yeshayahu Talmon
Summary: This study investigates boron nitride nanotubes (BNNTs) synthesized by the high temperature-pressure (HTP) method and compares their properties after different purification processes using advanced electron microscopy techniques. The results show that BNNTs of higher purity form small, ordered domains at lower concentrations and defects do not prevent their nematic alignment. Cryogenic electron microscopy provides direct-imaging evidence of the BNNT liquid crystalline phase, suggesting the potential for the fabrication of highly ordered BNNT-based macroscopic assemblies through liquid-phase processing.
JOURNAL OF MATERIALS RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Qingwei Yan, Wen Dai, Jingyao Gao, Xue Tan, Le Lv, Junfeng Ying, Xiaoxin Lu, Jibao Lu, Yagang Yao, Qiuping Wei, Rong Sun, Jinhong Yu, Nan Jiang, Ding Chen, Ching-Ping Wong, Rong Xiang, Shigeo Maruyama, Cheng-Te Lin
Summary: A rapid and high-yield method based on a microfluidization technique is developed to obtain exfoliated BNNS with a record high aspect ratio of approximate to 1500 and low degree of defects. The composite film made of BNNS and poly(vinyl alcohol) (PVA) matrix exhibits an in-plane thermal conductivity of 67.6 W m(-1) K-1 at a BNNS loading of 83 wt %, leading to a record high value of thermal conductivity enhancement (approximate to 35,500). This provides a practical route to produce electrically insulating polymer composites with high thermal conductivity for thermal management applications in modern electronic devices.
Article
Materials Science, Ceramics
Ambreen Nisar, Cheng Zhang, Benjamin Boesl, Arvind Agarwal
Summary: Ultra-high temperature ceramics (UHTCs) have shown potential in the thermal protection system (TPS) by designing multi-component UHTCs (MC-UHTCs) with improved oxidation resistance. The Hf6Ta2O17 superstructure is synthesized via solid-state reaction between HfO2 and Ta2O5 powder mixtures during spark plasma sintering (SPS). The high content of Hf6Ta2O17 phase and lower strain in the Ta2O5 phase contribute to the ability of 50HO-50TO to withstand intense plasma conditions. The thermo-mechanical stability of the Hf6Ta2O17 superstructure suggests the development of novel oxidation-resistant MC-UHTCs for reusable space vehicle applications.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Ambreen Nisar, Lihua Lou, Benjamin Boesl, Arvind Agarwal
Summary: Future-generation spacecraft components require novel materials with high thermal stability and mechanical integrity in extreme environments (>2000 degrees C). The combination of ultra-high temperature ceramics and carbon fibers can meet the demanding requirements of aerospace applications. By fabricating a hybrid and flexible hafnium carbide-decorated carbon nanofiber mat via electrospinning, the thermal stability and strength of the material significantly improved, making it a promising candidate for thermal protection systems in future spacecraft.
Article
Engineering, Electrical & Electronic
Anis Allagui, Ahmed S. Elwakil, Chunlei Wang
Summary: This paper aims to demonstrate the four possible mapping functions for voltage or charge inputs and their corresponding time-domain or frequency-domain electrical charge outputs when a capacitive device is voltage-charged. Similarly, there are four more possible combinations when the device is current-charged. The dual relationship between each pair of functions is established using single or double Fourier transforms. All eight system functions align only if a constant time- and frequency-independent capacitance is assumed.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Manufacturing
Adeyinka Idowu, Tony Thomas, Benjamin Boesl, Arvind Agarwal
Summary: A cryo-system-assisted extrusion 3D printing technique was developed to fabricate Shape Memory Polymer Epoxy (SMPE) thermoset into a near-net shape. The addition of 0.1 wt% graphene nanoplatelets improved the shape recovery, tensile strength, elastic modulus, storage modulus, and loss tangent of the 3D-printed SMPE composites. This study demonstrates a non-existent 3D printing technology for pure thermoset polymers with and without conductive graphene, opening up possibilities for various applications.
JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME
(2023)
Article
Materials Science, Multidisciplinary
Denny John, Tanaji Paul, Sohail M. A. K. Mohammed, Gonzalo Seisdedos, Benjamin Boesl, Arvind Agarwal
Summary: The efficacy of the high-throughput profilometry-based indentation plastometry (PIP) technique for evaluating bulk tensile properties of SiC-reinforced aluminum MMC is investigated. The PIP estimations of yield strength (YS) and ultimate tensile strength (UTS) are accurate within 3-6%, but the estimations of UTS in 25 vol% and ε(n) in all composites show significant deviation from tensile test data.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Materials Science, Ceramics
Giuseppe Bianco, Ambreen Nisar, Cheng Zhang, Benjamin Boesl, Arvind Agarwal
Summary: By utilizing machine learning models trained with experimental data, we are able to predict the oxide thickness of UHTC carbides exposed to air based on various factors such as composition, grain size, densification, holding time, and temperature. The trained model successfully predicts the oxidation damage in UHTC carbides with a Mean Absolute Error of +/- 65.45 μm for samples up to 1000 μm in thickness.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Multidisciplinary
Gonzalo Seisdedos, Edgar Viamontes, Eduardo Salazar, Mariana Ontiveros, Cristian Pantea, Eric S. Davis, Tommy Rockward, Dwayne McDaniel, Benjamin Boesl
Summary: Non-destructive evaluation of polymer curing using ultrasonics. The presence of residual solvent can negatively affect the quality of polymers. This study presents a method for non-destructively evaluating the curing process and final properties of polymeric materials using ultrasonics. Ultrasonics have the potential to characterize the quality of polymers in both in-field and manufacturing settings.
APPLIED SCIENCES-BASEL
(2023)
Review
Materials Science, Multidisciplinary
Sohail Mohammed, Pranjal Nautiyal, Tanaji Paul, Cheng Zhang, Arvind Agarwal
Summary: Boron Nitride Nanotubes (BNNTs) have exceptional mechanical properties and structural similarities to carbon nanotubes. They exhibit superior thermal stability, higher resistance to oxidation at elevated temperatures, and enhanced neutron shielding capacity. These advantages open up possibilities for manufacturing BNNT-reinforced MMCs and their applications in radiation shielding.
CRITICAL REVIEWS IN SOLID STATE AND MATERIALS SCIENCES
(2023)
Article
Engineering, Mechanical
Priscila Rodrigues De Oliveira, Abhijith Kunneparambil Sukumaran, Luiza Benedetti, Denny John, Katie Stephens, Sang-Hyon Chu, Cheol Park, Arvind Agarwal
Summary: Novel hexagonal boron nitride (h-BN) based polyimide (PI) nanocomposites were prepared, exhibiting excellent thermal stability and chemical resistance. The nanocomposites showed improved tribological performance and neutron shielding capacity compared to neat PI under high temperature and neutron radiation environments.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Polymer Science
Adeyinka Idowu, Tony Thomas, Jenniffer Bustillos, Benjamin Boesl, Arvind Agarwal
Summary: This research explores the potential of three-dimensional (3D) graphene foam (GrF) as a highly efficient reinforcement for shape memory polymer (SMP) epoxy composites. The GrF-based SMP epoxy composite exhibits significant improvements in thermal conductivity, electrical conductivity, shape recovery ratio, and recovery rate. These composites hold immense promise for diverse applications such as mechanical systems, wearable sensors, morphing wings, foldable robots, and antennas.
Article
Materials Science, Multidisciplinary
Sohail M. A. K. Mohammed, Tanaji Paul, Denny John, Cheng Zhang, Arvind Agarwal
Summary: This study successfully achieves the dispersion and reinforcement of boron nitride nanotubes in aluminum matrix composites through ultrasonic cavitation-assisted casting, resulting in improved grain refinement and mechanical properties of the composites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Review
Engineering, Manufacturing
Abderrachid Hamrani, Fatma Zohra Bouarab, Arvind Agarwal, Kang Ju, Hamid Akbarzadeh
Summary: This review provides an exhaustive exploration of multiple wire arc additive manufacturing (MWAAM) techniques and their applications in additive manufacturing and welding. The versatility and potential of these techniques, which can fabricate a variety of materials, are emphasized, and their relevance in major industries such as aerospace, naval, automotive, and energy is highlighted.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Nanoscience & Nanotechnology
Kazue Orikasa, Tyler Dolmetsch, Lihua Lou, Tony Thomas, Benjamin Boesl, Arvind Agarwal
Summary: In this study, ultralight boron nitride nanoplatelet (BNNP) foams were fabricated via freeze-drying, and their highly anisotropic thermal and mechanical properties were characterized. The study also established a protocol for designing 2D material foams with tailorable properties for thermal management applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
M. I. Rodriguez-Tapiador, A. Jimenez-Suarez, A. Lama, N. Gordillo, J. M. Asensi, G. del Rosario, J. Merino, J. Bertomeu, A. Agarwal, S. Fernandez
Summary: This study investigates the effects of temperature and gas working pressure on the solar absorption capabilities of Cu3N thin films. The results show that Cu3N thin films have favorable optical properties and resilience against defects, making them promising for solar energy applications.
Article
Materials Science, Ceramics
Tony Thomas, Ambreen Nisar, Cheng Zhang, Shreyas Joglekar, Mark Pankow, Benjamin Boesl, Arvind Agarwal
Summary: This study investigates the dynamic impact behavior and fracturing evolution of TaxHf1-xC samples under high strain rates. Ta0.5Hf0.5C exhibits the highest compressive strength and significantly reduces the crack propagation rate. This effect is attributed to dislocation pile-ups, nano-twin formation, and inter grain twisting.
CERAMICS INTERNATIONAL
(2023)
