Article
Polymer Science
Sakshey Mittal, R. K. Mondal, K. A. Dubey, Y. K. Bhardwaj
Summary: This study presents a tailored copolymer composition for wrapping carbon nanotubes, resulting in a significant increase in dielectric permittivity and unique nonlinear rheological response. The interfacial polarization effect between the ethylene vinyl acetate copolymer and carbon nanotubes was observed, leading to high dielectric permittivity with minimal CNTs volume fraction. The study also proposes a hook-wrap-type mechanism for polymer-CNT interactions and suggests that melt processing can be used for scalable production of polymer dielectrics.
JOURNAL OF APPLIED POLYMER SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Hongjuan Geng, Menghua Qin, Jialiang Li
Summary: This work presents a facile approach to prepare cellulose/MWCNTs hydrogels and aerogels by mixing cellulose with N, N'-methylene bisacrylamide (MBA) and MWCNTs in NaOH/urea/H2O aqueous solution. The hydrogels exhibited shorter gelation time, higher puncture strength, and water retention ability compared to pure cellulose hydrogel. The cellulose/MWCNTs aerogels possessed a three-dimensional network structure with a macroporous structure, low density, high porosity, good thermal stability, and certain absorbency to methylene blue.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Physical
V. Ya Rudyak, A. Minakov, M. Pryazhnikov
Summary: This study experimentally investigated the rheology and viscosity of nanofluids containing SWCNT, showing that the fluid index decreased and the consistency factor increased with increasing concentration of SWCNT. The viscosity of the nanofluids depended on the effective size of SWCNTs, and they exhibited viscoelastic properties due to the formation of a solid spatial lattice of nanotubes.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Multidisciplinary
Mitchell J. Senger, Ali Kefayati, Andrea Bertoni, Vasili Perebeinos, Ethan D. Minot
Summary: Experimental and theoretical studies have shown that the efficiency of photocurrent generation in oil is improved by more than an order of magnitude compared to other environments. This improvement is attributed to the optimization of interference between incident and reflected light due to the environment's refractive index, as well as the reduction in exciton binding energies in oil, altering the relaxation pathways of photoexcited carriers. The presence of a dielectric screening allows for the coexistence of autoionization of second-subband excitons with carrier multiplication, leading to photocurrent quantum yields greater than 100%.
Article
Chemistry, Physical
Minju Jeong, Hyekyeong Jang, Hwa-Jin Cha, Byeongho Park, Junghwan Kim, Jung-Keun Yoo, Taehoon Park, Jin Woo Yi, Dong Gi Seong, Youngseok Oh
Summary: The use of gelatin as a bio-derived binder to modulate the structural integrity of carbon nanotube networks enables the 3D printing of complex porous structures with large surface areas and excellent mechanical stability.
Article
Engineering, Electrical & Electronic
Lucas Lum, Zhi Kai Ng, Rong Tao Jiang, Chong Wei Tan, Edwin Hang Tong Teo, Beng Kang Tay
Summary: This article reports the complex electromagnetic properties of vertically aligned carbon nanotube arrays. The VACNT arrays were found to be partially anisotropic and displayed lossy dielectric and diamagnetic behavior. This findings contribute to the design of carbon nanotube applications in high-frequency electronics in the future.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Chemistry, Multidisciplinary
Zihang Peng, Ye Shi, Norris Chen, Yanji Li, Qibing Pei
Summary: Dielectric elastomer actuators (DEAs) show promise in various applications due to their large actuation strain, high energy density, and light weight, but their practical applications are hindered by poor reliability and durability under high-strain actuation. Compliant electrodes with self-clearing capability have been studied to prevent premature failures.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Composites
Afrooz Eshraghian, Milad Kamkar, Mohammad Asgari, Mohammad Arjmand, Uttandaraman Sundararaj
Summary: This study investigates the effect of functionalized nanoclay on the dielectric properties of synthesized nitrogen-doped carbon nanotube (N-CNT)/nanoclay/polyvinylidene fluoride (PVDF) nanocomposites prepared via melt-mixing in the X-band. The results show that the incorporation of nanoclay improved the dielectric properties, reduced dissipation factor, and expanded the percolation region of the N-CNT/PVDF nanocomposites. The addition of nanoclay also reduced the agglomeration area ratio and caused the collapse of N-CNT networks in the nanocomposites.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Multidisciplinary
Shamil Galyaltdinov, Ivan Lounev, Timur Khamidullin, Seyyed Alireza Hashemi, Albert Nasibulin, Ayrat M. Dimiev
Summary: In this study, polymer composites with record-high dielectric permittivity in both low-frequency range and X-band were successfully prepared by using Tuball carbon nanotubes as fillers and a simple preparation procedure. The specific structural features of Tuball nanotubes were attributed to the significantly high permittivity values.
Article
Chemistry, Physical
Chin-Sheng Pang, Shu-Jen Han, Zhihong Chen
Summary: TFETs have emerged as a potential candidate to outperform conventional FETs at low voltages, with their operation mechanism overcoming the fundamental subthreshold swing limit. CNT-based TFETs show excellent performance with a minimum SS of 41 mV/dec and nearly no temperature dependence, paving a promising path for low-power electronic applications. TFET devices using CNTs with smaller bandgaps exhibit a record high BTBT current, indicating potential for high performance electronic applications.
Article
Materials Science, Characterization & Testing
David Fernandez Armada, Victoria Gonzalez Rodriguez, Pedro Costa, Senentxu Lanceros-Mendez, Goretti Arias-Ferreiro, Maria-Jose Abad, Ana Ares-Pernas
Summary: The development of new conducting composites with lower environmental impact for electric and electronic applications is an important issue. Blending PHBV with HDPE and MWCNTs and optimizing their dispersion and amount has resulted in composites with reduced environmental impact and suitable for EMI shielding applications.
Article
Chemistry, Multidisciplinary
Naveed A. Bakh, Xun Gong, Michael A. Lee, Xiaojia Jin, Volodymyr B. Koman, Minkyung Park, Freddy T. Nguyen, Michael S. Strano
Summary: This study developed a nanosensor platform for selective molecular recognition of ascorbic acid and riboflavin in a murine model, demonstrating reproducible and stable results even after exposure to mouse serum for three days, and achieving an order of magnitude improvement in p-value during analyte sensing by using a geometrical encoding scheme to correct for optical and mechanical artifacts.
Article
Chemistry, Physical
Xiaoran Wang, Qinghua Li, Haoxin Lai, Shilang Xu
Summary: This paper introduces a novel metawall perfect MM absorber based on carbon nanotubes, which exhibits ultrawideband perfect absorption with three peaks at 99% absorption and over 97% absorption in the 5.6-11.0 GHz range. A reproducible and cost-efficient fabrication method using CNT paste and a combination of lossy cement board and lossless ceramic fiberboard is proposed. The wideband perfect absorption is attributed to the unique structure and absorption performance of the cement board.
Article
Engineering, Chemical
Saeed Dolatshah, Shervin Ahmadi, Amir Ershad Langroodi, Aida Alavi
Summary: The effects of two chain extenders on the performance of PET/CNT nanocomposites were investigated, and it was found that the chain extenders could improve the rheological behavior, thermal characteristics, and crystallization rate of PET, and also affect the electrical properties of the nanocomposites.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Construction & Building Technology
Ji-Hyun Kim, Ik-Je Choi, Chul-Woo Chung
Summary: The research found that adding SWCNT solutions decreased the plastic viscosity of cement paste but increased yield stress, as well as improving compressive and flexural strength. Although cement paste with SWCNT dispersed by AEA showed lower mechanical strength than that dispersed by DOC, it is still feasible for use as a dispersing agent due to its higher mechanical strength compared to plain cement paste.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Polymer Science
Yuanzhang Jiang, Xuyi Wang, Yanting Han, Dakai Gong, Yingchun Gu, Lin Tan
Summary: In this study, FeCl3 and poly(acrylic acid) (PAA) were doped into waterborne polyurethanes (WPUs) to create multifunctional materials with self-healing and antimicrobial properties. WPU/Fe/PAA-5.5, containing 5.5 wt % PAA, exhibited excellent mechanical properties, strong self-healing capabilities, and an impressive antimicrobial rate of over 90%. These supramolecular films were also highly recyclable through hot-pressing.
Article
Polymer Science
Longyu Tian, Min Wang, Guangming Liao, Baoliang Liu, Sujuan Zhang, Yucheng Sun, Zhen Meng, Jintao Zhang, Zaijun Lu
Summary: Two kinds of benzoxazine monomers were synthesized and used to prepare polybenzoxazine anion exchange membranes (AEMs) with quaternary ammonium functionalization. The LQPBZ AEM exhibited better ion conductivity and alkaline stability.
Article
Polymer Science
Claire A. Lemarchand
Summary: This study investigates the shock behavior of three different polymers through molecular dynamics simulations. The results reveal specificities in the shock behavior of polymers, including deviations from the linear relation between shock velocity and particle velocity, as well as differences in shear stress relaxation behind the shock front. It is found that the deviation of the Hugoniot locus is related to the change in the relative contribution of bonding and non-bonding potential energies, while polymers with higher glass transition temperatures exhibit slower shear stress relaxation.
Article
Polymer Science
Zengquan Liu, Xiaochun Yin, He Zhang, Shuo Gao, Qinglin Kuang, Yanhong Feng
Summary: A powder solid-state extension (PSSE) technology was proposed to address the high melt viscosity issue of UHMWPE. By uniaxial extension and sintering in the solid state, a highly self-reinforced material was prepared. X-ray diffraction and scattering techniques were used to study the structural evolution during the PSSE process, and a solid-phase induced transformation model was established.
Article
Polymer Science
Zhike Li, Anyu Luo, Rui Zhou, Xin Li, Haiyan Li
Summary: A novel high temperature resistance IL@SiO2 nanocapsules were successfully prepared and their friction and wear properties in PA6 composites were studied. The addition of IL@SiO2 nanocapsules reduced the friction coefficient and wear rate without affecting the mechanical properties of PA6. The synergy between the IL core and SiO2 wall in the nanocapsules improved the self-lubricating performance of the PA6 composites.
Article
Polymer Science
Xin Liu, Xuhong Guo, Qi Liao
Summary: In this study, an algorithm for accurately estimating viscosity is developed using molecular dynamics simulations and the Green-Kubo formula. This algorithm can be applied to complex systems with long correlations, such as macromolecular and biological simulation systems.
Article
Polymer Science
Hao Pu, Yun-Lei Hou, Jing -Zhou Chen, Dong -Lin Zhao
Summary: The use of modified graphene improves the interfacial adherence of carbon fibers to epoxy resin, resulting in enhanced interfacial and bending properties of CF and matrix in CF/EP composites, as well as increased interlaminar shear strength and flexural strength.
Article
Polymer Science
Wei-Chung Ke, Jin-Wei Lin, Manohar Reddy Busireddy, Yueh-Hsing Lee, Jiun-Tai Chen, Chain-Shu Hsu
Summary: This study introduces a crosslinkable monomer, TAIC, to synthesize three crosslinked polyimide films, which exhibit improved thermal, mechanical, and dielectric properties. The introduction of TAIC enhances the tensile strength, reduces the dielectric constant and dielectric loss, and decreases the coefficient of thermal expansion of the polyimide films.
Article
Polymer Science
Alex Kwasi Kumi, Ruiling Fan, Ye Chen, Yumei Zhang
Summary: The difference in leaching of amylopectin from cellulose/amylopectin/1-butyl-3-methylimidazolium chloride ([Bmim][Cl]) blends during regeneration in water and aqueous ethanol has been studied. Molecular dynamics simulations showed that the dissolution and regeneration mechanisms of amylopectin in [Bmim][Cl] are similar to cellulose in ionic liquids. Water regeneration leads to weak electrostatic interactions, resulting in high leaching of amylopectin. In contrast, ethanol-water interactions enhance electrostatic interactions among amylopectin chains, limiting amylopectin leaching in aqueous ethanol.
Article
Polymer Science
Xi Zeng, Junwei Zhou, Junbiao Peng, Chunsheng Zhang, Danling Wang, Yihu Song, Qiang Zheng
Summary: This study utilizes an oligomer deep eutectic solvent (DES) based on polyethylene glycol to regulate the vulcanization kinetics of rubber. The results show that the DES can accelerate vulcanization at low temperatures without affecting the crosslinking density and Mullins effect.
Article
Polymer Science
Qianqian Yue, Yongfei Peng, Xingjian Liu, Aihua He, Huarong Nie
Summary: The addition of metal deactivators can effectively suppress the aging of TBIR, prolong its lifespan, and have no negative effects on its physical and processing properties. These research findings are of great importance for improving the stability and aging resistance of polymers.
Article
Polymer Science
J. Gomez-Caturla, J. Ivorra-Martinez, R. Tejada-Oliveros, V Moreno, D. Garcia-Garcia, R. Balart
Summary: This work focuses on the development of environmentally friendly PLA formulations by using different esters derived from geraniol as plasticizers. The results show that these esters have good compatibility with PLA, and they can effectively enhance the elongation and plasticity of PLA, reduce its glass transition temperature, and slightly improve its water absorption capabilities.
Article
Polymer Science
Dandan Li, Zhaohui Lu, Zhao Ke, Ke Xu, Fengna Dai, Youhai Yu, Guangtao Qian, Chunhai Chen
Summary: In this study, cross-linked PI aerogel membranes with low dielectric constant and high moisture resistance were prepared by co-polymerization and scraping coating technology. The incorporation of fluorinated blocks and benzimidazole ring structures resulted in novel PI aerogel membranes with fascinating dielectric properties and outstanding moisture resistance.
Article
Polymer Science
Zhaoyang Chu, Qing Zhang, Haihua Luo, Han Zhou, Fapei Zhang, Wei Chen, Wenhua Zhang
Summary: Multi-physical fields solution processing strategy is a universal and facile method for preparing various conjugated polymer films and high-performance devices. In this study, we employed a combined microfluidic flow and ultrasonication strategy (FU) for processing CP solutions, and found a pronounced synergetic effect in promoting the pre-ordering of chains in solution. The conformation order and anisotropy of the solution were revealed through various characterizations. A non-classical nucleation model for polymer crystallization in non-equilibrium solution processing was confirmed. The roles of microfluidic flow and ultrasonication in chain aggregation and crystallization were addressed through multi-physical simulations. Compared to pristine solutions, the FU strategy showed improved solution anisotropy and crystallization kinetics, resulting in higher crystallinity in films and increased mobilities in OFET devices. The FU processing strategy provides a universal approach for regulating chain conformation and aggregation in conjugated polymer solutions.