Article
Polymer Science
Krishna Kiran Talamadupula, Gary Seidel
Summary: The electrical and mechanical properties of carbon nanotube/polymer nanocomposites are influenced by various factors, and this study used a stochastic approach with parallel computation to investigate the effects of CNT volume fraction, alignment, dispersion, and waviness on the effective electrical conductivity, elastic constants, and piezoresistive properties. The research found that increasing CNT volume fraction improved the mechanical properties, but the conductivity and piezoresistivity properties became more complex due to the interaction between CNTs through electrical tunneling. Alignment played a significant role in the effective properties, while the effect of waviness was found to be insignificant.
Article
Materials Science, Multidisciplinary
A. I. Oliva, G. G. Comparan-Rodriguez, V. Sosa, A. I. Oliva-Aviles
Summary: This article proposes a methodology for determining the Poisson's ratio (ν) of Au films with nanometric thicknesses. Au films with thicknesses of 10, 20, and 40 nm were deposited onto polyimide substrates, and electrical measurements were conducted. The gage factor of the Au nanofilms was measured and used for estimating the Poisson's ratio according to its definition for metallic materials. The estimated value of ν for the Au thin films was 0.50, slightly higher than the value for Au bulk (ν(bulk) = 0.42).
JOURNAL OF MATERIALS SCIENCE
(2023)
Review
Chemistry, Multidisciplinary
Francis Aviles
Summary: Carbon nanostructures, such as carbon nanotubes and graphene, demonstrate temperature-dependent electrical conductivity and can form percolated networks in polymers, enabling the development of smart materials with self-sensing temperature capabilities. This review summarizes past and present research on the thermoresistivity of carbon nanostructures and their polymeric nanocomposites, including few- and multi-layer graphene, carbon nanotubes, and carbon-nanostructured arrays and fibers. The review discusses the mechanisms behind the thermoresistive response of these nanostructures and highlights the role of the nanostructured filler in polymeric nanocomposites. It also provides insights into future directions for research in this field.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Krishna Kiran Talamadupula, Gary D. Seidel
Summary: Carbon nanotube embedded polymer nanocomposites exhibit varied electromechanical properties depending on factors such as CNT volume fraction, dispersion, alignment, and polymer properties. Of interest is electrical percolation, where the electrical conductivity increases significantly with CNT volume fraction. The role of barrier potential in determining electrical percolation, as well as the influence of CNT alignment on properties, are key areas of focus in the study.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Optics
V Solis-Tinoco, A. Acevedo-Barrera, O. Vazquez-Estrada, J. Munguia-Cervantes, N. Hernandez-Como, Luis F. Olguin, A. Garcia-Valenzuela
Summary: This method proposes an alternative optical approach to measure the thickness of metallic nanofilms by measuring reflectivity and fitting curves. It is less sensitive to surface roughness, contamination, and nanofabrication defects.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Dingzhang Wu, Hui Zhang, Ling Li, Longfei Qi, Yan Gao, Yunrui Yang, Qingming Chen
Summary: LCNMO ceramics were prepared using the sol-gel method and sintered at different temperatures, with the influence on structure and electrical properties systematically investigated. The results showed that higher sintering temperatures led to lower resistivity, with the best temperature exhibiting a high temperature coefficient and maximum magnetic resistance. These findings suggest that LCNMO ceramics have potential for applications in infrared detection and magnetic sensing.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Composites
Ting Yui Wong, Tao Yu, Fangxin Zou
Summary: Non-monotonic electrical resistance changes have been observed in multi-walled carbon nanotube (MWNT)/epoxy nanocomposites under tensile loading, but the mechanism is not fully understood. This study evaluates the impact of curing condition on the piezoresistivity of MWNT/epoxy nanocomposites, and suggests that a higher curing temperature can enhance the monotony of the piezoresistivity. The results indicate that the molecular structure of the polymer matrix contributes to the non-monotonic piezoresistivity of CNT/epoxy nanocomposites.
COMPOSITES COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Jianke Liu, Jiaojiao Chen, Ruiting Zhang, Jinfeng Su, Yinan Qiao, Xin Xie, Wenbin Cao
Summary: This study investigated the effects of La2O3 doping on the microstructure and comprehensive electrical properties of ZnO linear resistors, and found that ZnO resistors doped with 1 wt% La2O3 demonstrated the best performance, with relatively uniform grain size, a lower resistance temperature coefficient, and a suitable nonlinear coefficient.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Multidisciplinary
Shenyi Ding, Jixiang Zhang, Cui Liu, Nian Li, Shudong Zhang, Zhenyang Wang, Min Xi
Summary: In this study, gold nanospheres (Au NSs) and gold nanorods (Au NRs) were synthesized and developed into nanofilms with poly(vinylidene fluoride) (PVDF). Solar photothermal experiments showed that Au NR/PVDF nanofilm exhibited higher solar photothermal performance than Au NS/PVDF nanofilm. Detailed analysis revealed that plasmonic coupling effects inside the aggregated Au NR nanodusters contributed to spectral blue shifts and intensified the photothermal performance, resulting in higher light-to-heat conversion rate for Au NR/PVDF nanofilm.
Article
Chemistry, Analytical
Shuai Lei, Ningning Su, Mengwei Li
Summary: Graphene membranes show potential as temperature sensors in nanoelectromechanical devices due to their excellent thermal properties. A study investigates the sensing performance of graphene temperature sensors at higher temperature intervals. The results demonstrate a high temperature coefficient of resistance in the range of 300-575 K. This finding provides further understanding of the temperature characteristics of graphene.
Article
Materials Science, Multidisciplinary
Ikhlas H. Shallal, Nidhal M. Abdul-Ameer, Shaymaa Q. Abdul-Hasan, Moafak C. Abdulrida
Summary: This study investigates the opacity of vanadium dioxide nanofilms, revealing different behaviors at different wavelength ranges and with varying thickness. The results show that the highest opacity is achieved in the ultraviolet region for the insulating phase, while the lowest opacity is found in the infrared region for the same phase. Additionally, the opacity behavior remains similar in the three phases in the visible region.
MATERIALS RESEARCH EXPRESS
(2022)
Article
Thermodynamics
Yuxiang Xia, Guozeng Feng, Jinjin Xu, Jintang Zhu, Gang Han, Weiming Zhou, Yanping Xiao
Summary: In order to improve the performance of PTC heaters and achieve the maximum mileage of electric vehicles in winter, this study investigated the effects of four parameters on the heat transfer and resistance performance of PTC heaters using numerical simulation. By optimizing the design parameters, a new wavy fin heater with a heating performance of 7.19 kW was obtained.
APPLIED THERMAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ruiting Hou, Lanlan Tian, Shaozheng Wang, Xiangxiang Zhu, Haishan Wang, Ping Yu, Yule Li, Qingming Chen, Hui Zhang
Summary: The sol-gel method was used to prepare La1-xCaxMnO3 (LCMO) precursor powder, and ethylene glycol was selected as a dispersant to obtain LCMO ceramics with excellent uniformity. The study showed that the optimized preparation process can regulate the electrical transport properties and magnetoresistance of LCMO, thereby improving its potential application in infrared detection and magnetic sensitivity.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Polymer Science
Stepan V. V. Lomov, Iskander S. S. Akmanov, Qiang Liu, Qi Wu, Sergey G. G. Abaimov
Summary: The temperature dependence of the electrical conductivity/resistivity of CNT networks is observed to be negative, especially for aligned CNTs (A-CNTs). This study investigates the role of three phenomena, namely the temperature dependence of the intrinsic conductivity of CNTs, the tunnelling resistance of their contacts, and thermal expansion of the network, on the temperature coefficient of resistance (TCR). The results show that the TCR of the CNTs themselves is the main factor influencing the TCR of the film, while the TCR of the tunnelling contacts and film thermal expansion have marginal effects.
Article
Chemistry, Physical
Fei Jin, Duojie Wu, Yani Lu, Zizhao Pan, Meng Gu, Hong Wang
Summary: In this work, oxygen vacancy-regulated La0.7Ca0.3MnO3-delta:Ag (LCMO:A) nanocomposite thin films were synthesized and investigated for their high temperature coefficient of resistance (TCR) values. The effects of oxygen pressures on the lattice parameter, T-p value, and Mn4+ concentration in the films were studied. The LCMO:A nanocomposite thin film prepared with optimal oxygen pressures exhibited a record high TCR value of approximately 37% K-1, making it a promising candidate for applications in bolometers.
JOURNAL OF MATERIOMICS
(2022)
Article
Physics, Applied
Victor Sosa, Fidel Gamboa-Perera, Maria Jose Hernandez
Summary: The study focused on levitating a YBCO superconducting specimen using a closed path of permanent magnets. Two models were used to calculate the forces acting on the superconductor, with experimental results validating the calculated values.
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
(2021)
Article
Engineering, Biomedical
Georgina Alejandra Venegas-Cervera, Andres Ivan Oliva, Alejandro Avila-Ortega, Jose Manuel Cervantes-Uc, Leydi Maribel Carrillo-Cocom, Juan Antonio Juarez-Moreno
Summary: Electrospun polyurethane membranes were fabricated using arginine as chain extender to test fibroblasts affinity and adhesion, with results indicating greater fluorescent surface area on dense control membranes made from Tecoflex compared to electrospun and dense PUUR. SEM analysis revealed the well-spread shape of cells on electrospun membranes, attributing to the fiber's structure. Cell morphology and attachment assay results showed a good response related to cell adhesion on the surface of electrospun PUUR membranes.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN MEDICINE
(2021)
Article
Chemistry, Multidisciplinary
R. Mendoza, M. Al-Sardar, A. Oliva, G. Robledo-Trujillo, V Rodriguez-Gonzalez, A. Zakhidov, J. Oliva
Summary: This study reports the improvement of flexible carbon nanotube-based supercapacitors using TiNiW nanoparticles, demonstrating significant enhancement in capacitance and energy density after adding TiNiW NPs. The addition of TiNiW NPs also reduced the electrical resistance at the electrode/electrolyte interface to facilitate ion diffusion and storage, paving the way for portable or wearable applications of flexible SCs.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
R. Perez-Gonzalez, S. Cherepanov, A. Oliva, A. Zakhidov, A. Encinas, H. Flores-Zuniga, S. Diaz-Castanon, J. Oliva
Summary: This study presents the electrochemical characterization of flexible carbon nanotube-based asymmetric supercapacitors made with biodegradable components, where BaFeO nanoparticles were introduced to enhance performance. The results showed significant improvement in capacitance and energy density after decorating the anodes with BaFeO NPs. Additionally, stable output voltage and the presence of redox centers for charge storage were observed, indicating the potential for developing new biodegradable supercapacitors with high capacities similar to batteries.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Chemistry, Physical
A. Trejo-Ramos, P. E. Martin-Varguez, I. J. Gonzalez-Chan, A. Oliva
Summary: The algorithm presented in this work enables the determination of species distribution diagrams and solubility curves in a chemical bath system, facilitating the synthesis of high-quality ZnO, ZnS, or Zn(OH)2 films. By identifying all formed species, chemical conditions can be obtained in a temperature range from 25 degrees C to 90 degrees C. The better conditions for obtaining the mentioned films are explained and justified through optical, morphological, and structural characterizations.
COMPUTATIONAL AND THEORETICAL CHEMISTRY
(2021)
Article
Chemistry, Physical
Israel Perez, Victor Sosa, Fidel Gamboa, Jose Luis Enriquez-Carrejo, Juan Carlos Mixteco Sanchez
Summary: The influence of lithium insertion on the electronic and electrochemical properties of fluorine-doped SnO2 (FTO) was assessed using a combination of experimental techniques and density functional theory (DFT) calculations. The electrochromic properties of FTO were evaluated and it was found that lithium remains ionized in the lattice, raising the Fermi level and inducing a shift in the Sn 3d states.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Crystallography
I. J. Gonzalez-Panzo, C. Tabasco-Novelo, E. Rosendo, A. Oliva, R. Romano-Trujillo, R. Galeazzi, C. Morales, G. Garcia, A. Coyopol
Summary: ZnSe nanoparticles were synthesized in aqueous colloidal solution at different pH levels and temperature. Physicochemical analysis was conducted to study the formation and growth process of ZnSe-NPs. Characterization of the ZnSe-NPs was performed using XRD, Raman spectroscopy, SEM, and EDS techniques, revealing mixed cubic and hexagonal structures with nanoscale crystal sizes.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Physics, Applied
E. Figueroa-Gonzalez, R. Mendoza, A. Oliva, C. Gomez-Solis, L. S. Valle-Garcia, E. Oliva, V Rodriguez-Gonzalez, A. Encinas, J. Oliva
Summary: We report on the fabrication and electrochemical characterization of biodegradable and flexible supercapacitors. These supercapacitors use graphene nanoplates coated coconut fibers as conductive electrodes, an oral electrolyte solution and rice paper as electrolyte and separator. By adding MgTiO3 nanoparticles to the anode, the capacitance and specific energy of the supercapacitors were enhanced. The biodegradable cells exhibited long discharge times and stable output voltage, which have not been observed previously for such supercapacitors.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Materials Science, Composites
Ivan Perez, Samuel Flores, Cesar Ortiz, Miguel Rivero, Jose Emilio Corona, Andres Ivan Oliva, Francis Aviles
Summary: The dispersion state of multilayer graphene sheets in polymers significantly affects the properties of nanocomposites. By adjusting roller gaps and processing cycles, smaller and more densely packed agglomerates can be achieved, impacting the electrical conductivity and mechanical properties of the nanocomposites. The density of agglomerates plays a key role in governing the piezoresistive sensitivity.
POLYMER COMPOSITES
(2022)
Article
Energy & Fuels
R. Mendoza, J. Oliva, K. P. Padmasree, A. Oliva, A. Mtz-Enriquez, A. Zakhidov
Summary: The study demonstrated that incorporating CaCo oxide into solid state supercapacitors made from surgical face mask waste and blister packs recycled from paracetamol packaging can significantly improve energy density and capacitance. The devices showed high capacitance retention even under pressure conditions, with minimal decrease in capacitance. Analysis also revealed the presence of additional redox species and oxygen vacancies, indicating the ability of the devices to store charge efficiently through redox reactions.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Chemistry, Physical
A. Molina, A. Oliva, A. Zakhidov, E. Valadez-Renteria, V Rodriguez-Gonzalez, A. Encinas, J. Oliva
Summary: This work presents the fabrication of flexible and biodegradable sensors for NO2 detection. The sensors show active sites on their surface for gas detection and exhibit advantages of low power consumption and recoverability.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Chemical
Luis Alfonso Can-Herrera, Andres Ivan Oliva, Jose Manuel Cervantes-Uc
Summary: Polycaprolactone (PCL) and poly(lactic acid) (PLA) are two polymers with unique properties, and their blending can produce a new biodegradable material with balanced properties. However, both PCL and PLA are highly hydrophobic materials. The surface characteristics of electrospun PCL/PLA blends can be improved by air plasma treatment and adjusting the content of its components.
POLYMER ENGINEERING AND SCIENCE
(2022)
Article
Energy & Fuels
E. Figueroa-Gonzalez, A. Oliva, V Rodriguez-Gonzalez, C. Gomez-Solis, C. R. Garcia, J. Oliva
Summary: Recycling materials containing plastics is important for environmental protection, as they can contribute to microplastic contamination in oceans and rivers. By using recycled tetrapak/graphene and Ag/BaMoO4 nanoparticles, the researchers fabricated supercapacitors with improved capacitance, energy density, and stability. This study demonstrates that utilizing recycled materials like tetrapak can reduce costs and plastic pollution in the environment.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Jinrong Yin, Jialun Li, Liying Wang, Bin Cai, Xijia Yang, Xuesong Li, Wei Lu
Summary: This study provides a simple and feasible method to fabricate a monomer photovoltaic electrochromic supercapacitor device by integrating dye-sensitized solar cells (DSSC) and electrochromic supercapacitors (ESC). The device exhibits high specific capacitance, excellent capacitance retention, and fast coloring/discoloring response. The multifunctional smart window can be used not only as a typical electrochromic window but also as an energy storage device simultaneously, showing great potential for various applications.
JOURNAL OF ENERGY STORAGE
(2022)
