Article
Nanoscience & Nanotechnology
Gongdong Wang, Meng Wang, Mingyang Zheng, Blackie Ebo, Chengyang Xu, Zhendong Liu, Long He
Summary: In this study, porous CPCs with a microdome array on the surface were developed based on TPU/CNT composites, which exhibit high stretchability and high resistance response. The sensors showed improved detection range and sensitivity due to the excellent electrical properties of CNTs and the synergistic effect of the composite surface microstructure and internal porous structure. These TPU/CNT composite sensors have excellent stability and durability during cyclic loading and can be applied in electronic skin, wearable smart devices, and human-computer interaction.
ACS APPLIED NANO MATERIALS
(2023)
Article
Engineering, Environmental
Beomsu Shin, Subhadip Mondal, Minkyu Lee, Suhyun Kim, Yang-Il Huh, Changwoon Nah
Summary: This study explores the effects of different lengths of CNTs on the performance of TPU composites, with long CNTs offering higher EMI shielding efficiency and short CNTs enhancing thermal conductivity. Long CNTs help form unique interconnected conductive networks within the TPU matrix, improving the overall performance of the composites.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Materials Science, Composites
Arman Farzaneh, Amir Rostami, Hossein Nazockdast
Summary: Nanocomposites of thermoplastic polyurethane and multiwalled carbon nanotubes were prepared with varying nanofiller content, and the influence of nanofiller content on physical properties was studied. The results showed that an increase in nanofiller content led to increased phase separation degree and electrical conductivity.
POLYMER COMPOSITES
(2021)
Article
Chemistry, Multidisciplinary
Jianxiang Shen, Xue Li, Ping Li, Baoqing Shentu
Summary: This study investigated the thermal properties and interfacial characteristics of thermoplastic polyurethane (TPU) nanocomposites filled with single-walled carbon nanotubes (SWNTs) using molecular dynamics simulations. The introduction of SWNTs was found to suppress TPU chain dynamics and enhance the hydrogen bond formation between TPU chains and SWNTs. Functionalized SWNTs with polar groups showed improved affinity for TPU molecules, leading to reduced polymer mobility and increased glass transition temperature (T-g). The presence of amine groups had the highest potential for hydrogen bonding with TPU chains, resulting in the lowest polymer mobility and the highest T-g. This research provides insights and guidance for the design of polymer nanocomposites and future simulations involving TPUs.
Article
Materials Science, Composites
Amir Hossein Ebrahimi, Samaneh Sahebian
Summary: In this study, thermally triggered shape memory thermoplastic polyurethane-multiwall carbon nanotube nanocomposites were prepared. The influence of nanofiller content and acid treatment on the properties of the nanocomposites was investigated. The results show that oxidized carbon nanotubes can effectively enhance the shape memory behavior of polyurethane.
POLYMER COMPOSITES
(2022)
Article
Biochemistry & Molecular Biology
Jose Munoz-Chilito, Jose A. Lara-Ramos, Lorena Marin, Fiderman Machuca-Martinez, Juan P. Correa-Aguirre, Miguel A. Hidalgo-Salazar, Serafin Garcia-Navarro, Luis Roca-Blay, Luis A. Rodriguez, Edgar Mosquera-Vargas, Jesus E. Diosa
Summary: The impacts of adding multi-walled carbon nanotubes (MWCNTs) on the properties of thermoplastic polyurethane (TPU) plates were investigated in terms of morphology, electrical conductivity, and hardness. TPU/MWCNT nanocomposite plates were fabricated using compression molding, with MWCNT loadings ranging from 1% to 7%. X-ray diffraction analysis indicated that the incorporation of MWCNTs increased the ordered range of the TPU polymer matrix. SEM images showed that the fabrication route used resulted in a uniform dispersion of nanotubes inside the TPU matrix, creating a conductive network for electronic conduction. Impedance spectroscopy revealed that the TPU/MWCNT plates exhibited percolation and tunneling conduction mechanisms, with increasing conductivity values as the MWCNT loading increased. Additionally, the addition of MWCNTs increased the Shore A hardness behavior of the TPU plates, despite a reduction in hardness compared to pure TPU.
Article
Engineering, Electrical & Electronic
Xiaoyu Chen, Dong Xiang, Jiayi Li, Xuezhong Zhang, Eileen Harkin-Jones, Yuanpeng Wu, Chunxia Zhao, Hui Li, Zhenyu Li, Ping Wang, Yuntao Li
Summary: This study produced a high-performance strain sensor using biaxially stretched carbon nanotubes (CNTs)/thermoplastic polyurethane (TPU) nanocomposites. The stretching process improved the crystallinity and sensing properties of the materials, and the 2.0 wt % CNT/TPU-1.5 strain sensor showed optimal performance.
ACS APPLIED ELECTRONIC MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Maya Pishvar, Mehrad Amirkhosravi, Ica Manas-Zloczower
Summary: In this study, TPU-PTFE nanocomposites with improved thermomechanical properties were successfully made by fibrillation of micron-sized PTFE particulates inside the TPU matrix. PTFE forms a fibrillary network inside the TPU matrix, which enhances the creep behavior, thermal stability, storage modulus, and reduces the thermal expansion coefficient of the nanocomposites. The glass transition temperature of nanocomposites with 10 wt % PTFE shows two transitions, while a single peak is observed for the neat TPU.
ACS APPLIED POLYMER MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Cijun Shuai, Zhicheng Wang, Shuping Peng, Yang Shuai, Yanwen Chen, Da Zeng, Pei Feng
Summary: Combining selective laser sintering (SLS) with water-responsive shape memory polymers provides a promising approach to minimally invasive bone defect repair. In this study, a porous bone scaffold made of biocompatible thermoplastic polyurethane (TPU) with water-responsive shape memory properties was fabricated using SLS. The results showed that water molecules can interact with TPU, affecting the hydrogen bonding and shape fixation. In vitro experiments demonstrated that the shape-recovered scaffold promotes cell adhesion and proliferation.
MATERIALS CHEMISTRY FRONTIERS
(2022)
Article
Polymer Science
Kittimon Jirakittidul, Darawan Limthin, Sarita Mahithithummathorn, Seenam Phaewchimphlee
Summary: The effect of annealing on the selective dispersion of multi-walled carbon nanotubes (MWCNTs) in thermoplastic polyurethane (PU) nanocomposites was studied. It was found that annealing promoted the development of MWCNT networks, resulting in higher electrical conductivity levels.
Article
Polymer Science
Mehrad Amirkhosravi, Liang Yue, Tianxiong Ju, Ica Manas-Zloczower
Summary: The study improved the high-temperature mechanical performance of TPU films using a simple annealing process while maintaining strength properties at room temperature. Annealing not only enhanced the creep behavior and storage modulus of the films, but also discussed its effect on structural evolution.
Article
Engineering, Chemical
Libing Liu, Dong Xiang, Xiangxia Zhang, Eileen Harkin-Jones, Junjie Wang, Chunxia Zhao, Hui Li, Zhenyu Li, Li Wang, Ping Wang, Yuntao Li, Yuanpeng Wu
Summary: A double-percolation structural fiber strain sensor based on CNT/SBS@TPU composite was fabricated, showing lower percolation threshold and better performance, achieving high sensitivity and wide strain detection range. The sensor exhibited high conductivity, sensitivity, broad strain detection range, and excellent stability, successfully monitoring a range of human physiological activities and demonstrating tactile perception and weight distribution sensing capabilities.
POLYMER ENGINEERING AND SCIENCE
(2023)
Article
Polymer Science
Yubin Kim, PilHo Huh, Seong Il Yoo
Summary: The utilization of biodegradable nanofillers, such as nanocellulose, in polymer composites is a promising approach for sustainable development. However, the hydrophilicity of nanocellulose hinders its dispersion in hydrophobic polymer matrix, resulting in poor reinforcement effect. In this study, a simple surface modification technique was used to improve the solubility and dispersion of cellulose nanofibrils (CNFs) in a thermoplastic polyurethane (TPU) matrix, leading to enhanced mechanical properties.
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2023)
Article
Polymer Science
Maria Virginia Candal, Itxaso Calafel, Mercedes Fernandez, Nora Aranburu, Roberto Hernandez Aguirresarobe, Gonzalo Gerrica-Echevarria, Antxon Santamaria, Alejandro J. Muller
Summary: A thermoplastic bio-polyurethane (TPU) and its nanocomposite with carbon nanotubes (CNT) were investigated for Material Extrusion-based Additive Manufacturing (EAM). The nanocomposite showed better resistance to warpage and stronger filament elaboration and flow in the nozzle compared to TPU.
Article
Engineering, Manufacturing
Jian Gao, Mengyuan Hao, Yangyang Wang, Xiangyi Kong, Bin Yang, Runguo Wang, Yonglai Lu, Liang Zhang, Min Gong, Liqun Zhang, Dongrui Wang, Xiang Lin
Summary: This study investigates the incorporation of exfoliated hexagonal boron nitride nanosheets (BNNSs) into thermoplastic polyurethane (TPU) using solution-melt compounding and 3D printing. The results show that the orientation of BNNSs within the TPU matrix is mainly influenced by melt squeezing and shear flow during the printing process. The printed BNNS/TPU composites exhibit improved mechanical and thermal conductive performance compared to molded samples.
ADDITIVE MANUFACTURING
(2022)
Article
Medicine, Research & Experimental
Guilherme S. Ramos, Virginia M. R. Vallejos, Marina S. Ladeira, Priscila G. Reis, Daniel M. Souza, Yuri A. Machado, Luiz O. Ladeira, Mauricio B. Pinheiro, Maria N. Melo, Ricardo T. Fujiwara, Frederic Frezard
Summary: The study found that fullerol has potential anti-leishmanial activity, especially when combined with liposomes, showing significant reduction in parasite load. This innovative approach provides a new potential method for treating VL.
BIOMEDICINE & PHARMACOTHERAPY
(2021)
Article
Materials Science, Ceramics
Tarcizo da Cruz C. de Souza, Ana Cristina de Oliveira Melo, Tiago Campolina Barbosa, Carlos Viana Martins, Luiz Orlando Ladeira, Manuel Houmard
Summary: Nanostructured silica synthesized by sol-gel method was used as a support for multi-walled carbon nanotubes synthesis through catalytic chemical vapor deposition process. Three different methods to incorporate the iron-based catalyst on the silica support were studied to identify its influence on the structural characteristics of the synthesized MWCNTs, aiming to develop advanced hybrid composites with better structural properties. Characterization of the synthesized hybrid composites showed modifications in terms of graphitization degree, morphology, and thermal stability of the MWCNTs, influenced by the catalyst incorporation method.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Sara M. Queiroz, Felipe S. Medeiros, Claudia K. B. de Vasconcelos, Glaura G. Silva
Summary: Hexagonal boron nitride nanosheets (h-BNNS) have shown great potential as 2D nanomaterials. A mechanochemical method using NaOH aqueous solution as a process aid was developed to obtain high-yield h-BN nanosheets. The material prepared by autoclave and ball milling followed by tip sonication at 40 degrees C (h-BNNS-T40) showed the most promising results in terms of yield, quality, and practicality. A hybrid lamellar material prepared by drop-casting and dip-coating techniques showed improved thermal stability and chemical interactions between h-BNNS and graphene oxide (GO).
Article
Energy & Fuels
Claudia K. B. de Vasconcelos, Felipe S. Medeiros, Bruna R. S. Diniz, Marcelo M. Viana, Vinicius Caliman, Glaura G. Silva
Summary: The study investigated the use of graphene oxide and aminated graphene oxide to prepare nanofluids, with aminated graphene oxide showing better performance and greater viscosity enhancement in high salinity conditions.
Article
Polymer Science
Leice G. Amurin, Marcos D. Felisberto, Felipe L. Q. Ferreira, Pedro H. Soraes, Poliane N. Oliveira, Bruna F. Santos, Jose C. S. Valeriano, Daniel C. de Miranda, Glaura G. Silva
Summary: By dispersing reduced graphene oxide in an ultra high molecular weight polyethylene matrix, nanocomposites with high performance at low nanofiller contents were produced. The addition of graphene enhanced the wear resistance performance of the composite material, making it suitable for various high performance applications. This research result is of great significance for improving the performance of polymers.
Article
Archaeology
Joao Cura D'Ars de Figueiredo Junior, Hudson Diniz Pereira Marques, Glaura Goulart
Summary: This study explored a composite gap filler material made of expanded vermiculite and polyvinyl acetate for the conservation of wooden objects. The proposed composite showed comparable or even better properties than a model filler material containing sawdust, suggesting the potential use of expanded vermiculite as a filler for gap fillers.
JOURNAL OF CULTURAL HERITAGE
(2022)
Article
Materials Science, Multidisciplinary
Gustavo A. Ferrari, Helio Chacham, Alan B. de Oliveira, Matheus J. S. Matos, Ronaldo J. C. Batista, Leonel M. Meireles, Ana Paula M. Barboza, Ive Silvestre, Bernardo R. A. Neves, Rodrigo G. Lacerda
Summary: In this study, the mechanical and adhesion properties of graphene in contact with oleic acid were investigated using a microfluidic channel platform. The presence of oleic acid led to a significant encapsulation effect on graphene, which occurred concurrently with graphene delamination.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jeferson Aparecido Moreto, Pedro Henrique Sampaio Silva, Gabriel de Moraes Moura, Camila Cristina da Silva, Deusmaque Carneiro Ferreira, Thiago Henrique R. da Cunha, Glaura Goulart Silva, Francisco Rouxinol, Abner de Siervo, Rogerio Valentim Gelamo
Summary: This study presented an innovative method for preparing low-cost ionic gel and superficial CO2 plasma treatment to modify electrodes based on multiwall carbon nanotubes and multilayer graphene, resulting in flexible supercapacitors with excellent electrochemical performance.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Neuma M. Pereira, Natalia P. Rezende, Thiago H. R. Cunha, Ana P. M. Barboza, Glaura G. Silva, Daniel Lippross, Bernardo R. A. Neves, Helio Chacham, Andre S. Ferlauto, Rodrigo G. Lacerda
Summary: In this study, a MoS2 ink sensor with high sensitivity and fast response/recovery time was successfully prepared for humidity sensing applications. The mechanisms for the water-induced conductivity increase were discussed, and an analytical model that described the sensor response was proposed.
Article
Thermodynamics
Natalia F. Perdigao, Vinicius G. Castro, Glaura G. Silva
Summary: This study evaluates the impact of the resin/curing agent ratio on the glass transition temperature (T-g) of epoxy nanocomposites with different nanofillers. The results show that there is no significant change in T-g or enthalpy change of curing with 1 wt% nanofillers. The robust results obtained by DSC and DMA highlight the importance of the resin/curing agent ratio in ensuring consistent T-g results.
THERMOCHIMICA ACTA
(2022)
Article
Nanoscience & Nanotechnology
Tiago Amarante, Thiago H. R. Cunha, Claudio Laudares, Ana P. M. Barboza, Ana Carolina dos Santos, Cintia L. Pereira, Vinicius Ornelas, Bernardo R. A. Neves, Andre S. Ferlauto, Rodrigo G. Lacerda
Summary: A conductive ink based on microfibrillated cellulose (MFC) and multiwalled carbon nanotubes (MWCNTs) was utilized to produce transducers for rapid liquid identification. These transducers are resistive devices that can be easily fabricated using scalable printing techniques. By monitoring the electrical response and employing principal component analysis, the proposed liquid sensor successfully differentiated between different liquids and even low concentrations of glycerin in water. The MFC-MWCNT sensor platform holds promise for rapid, inexpensive, and robust liquid analysis and identification.
BEILSTEIN JOURNAL OF NANOTECHNOLOGY
(2023)
Article
Materials Science, Composites
Taiza M. C. dos Reis, Vinicius G. de Castro, Leice G. Amurin, Glaura G. Silva
Summary: This research focuses on the challenges of achieving optimized dispersion of graphene oxide (GO) in epoxy during scale-up production. The study successfully synthesized high-quality GO by exfoliation in ethanol, allowing for the spontaneous transfer of GO from the solvent to the epoxy resin. The resulting masterbatch had a GO content of 1.5 wt.%. By diluting the masterbatch in epoxy resin, nanocomposites with 0.25 wt.%, 0.50 wt.%, and 0.75 wt.% nanofiller contents were obtained. The research demonstrates the presence of a partial cross-linked network in these nanocomposites, attributed to strong interactions in the GO-epoxy interphase.
COMPOSITES PART C: OPEN ACCESS
(2023)
Article
Biology
Juliana Tatiara da Costa Siqueira, Aryane Campos Reis, Juliana Mainenti Leal Lopes, Luiz Orlando Ladeira, Lyderson Facio Viccini, Humberto de Mello Brandao, Michele Munk, Saulo Marcal de Sousa
Summary: Carbon nanotubes (CNTs) are important nanomaterials with various applications, but their increased production and use raise concerns about their potential impacts on the environment. In this study, we assessed the cytogenotoxic potential of carboxylated multi-walled carbon nanotubes (MWCNT-COOH) and their influence on the methylation patterns of Lactuca sativa meristematic cells. Our results showed that MWCNT-COOH induced root elongation at lower concentrations and decreased seed germination at higher concentrations. Cytogenetic analysis revealed increased chromosomal aberrations and micronucleus frequency, suggesting genotoxic effects. Additionally, MWCNT-COOH altered cytosine methylation profiles, with hypermethylation at lower concentrations and hypomethylation at higher concentrations.
Article
Nanoscience & Nanotechnology
Neuma Pereira, Julieta Carballo, Marcos Felisberto, Glaura Silva
Summary: This study presents a low-cost, easily scalable and environmentally friendly method for producing reduced graphene oxide conductive films on polyethylene terephthalate substrates. The films exhibit high light transmittance and low surface resistance, making them suitable for applications in electromagnetic shielding and electrostatic dissipation.
JOURNAL OF NANO RESEARCH
(2022)
