scholarly journals High-permittivity polymer nanocomposites: Influence of interface on dielectric properties

2013 ◽  
Vol 03 (03) ◽  
pp. 1330004 ◽  
Author(s):  
Zhi-Min Dang ◽  
Jin-Kai Yuan ◽  
Jun-Wei Zha ◽  
Peng-Hao Hu ◽  
Dong-Rui Wang ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Polymer Composites ◽  
Polymer Nanocomposites ◽  
Ceramic Particle ◽  
High Permittivity ◽  
High Loss ◽  
Interface Characteristics ◽  
Fundamental Understanding ◽  
Potential Applications

Flexible dielectric composites with high permittivity have been extensively studied due to their potential applications in high-density energy capacitors. In this review, effects of interface characteristics on the dielectric properties in the polymer-based nanocomposites with high permittivity are analyzed. The polymer-based dielectric composites are classified into two types: dielectric–dielectric (DD, ceramic particle-polymer) composites and conductor–dielectric (CD, conductive particle-polymer) composites. It is highly desirable for the dielectric–dielectric composites to exhibit high permittivity at low content of ceramic particles, which requires a remarkable interface interaction existing in the composite. For conductor–dielectric composites, a high permittivity can be achieved in composite with a small amount of conductor particle, but associated with a high loss. In this case, the interface between conductor and polymer with a good insulating characteristic is very important. Different methods can be used to modify the surface of ceramic/conductor particles before these particles are dispersed into polymers. The experimental results are summarized on how to design and make the desirable interface, and recent achievements in the development of these nanocomposites are presented. The challenges facing the fundamental understanding on the role of interface in high-permittivity polymer nanocomposites should be paid a more attention.

scholarly journals Chemical sensors based on polymer composites with carbon nanotubes and graphene: the role of the polymer

2014 ◽  
Vol 2 (35) ◽  
pp. 14289-14328 ◽  
Author(s):  
Horacio J. Salavagione ◽  
Ana M. Díez-Pascual ◽  
Eduardo Lázaro ◽  
Soledad Vera ◽  
Marián A. Gómez-Fatou
Keyword(s):  
Carbon Nanotubes ◽  
Polymer Composites ◽  
Polymer Nanocomposites ◽  
Polymeric Material ◽  
Chemical Sensors

The performance of chemical sensors based on polymer nanocomposites with CNTs and graphene is revised, highlighting the role of the polymeric material.

scholarly journals Durability of Biodegradable Polymer Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3375
Author(s):  
Tatjana Glaskova-Kuzmina ◽  
Olesja Starkova ◽  
Sergejs Gaidukovs ◽  
Oskars Platnieks ◽  
Gerda Gaidukova
Keyword(s):  
Polymer Nanocomposites ◽  
Biodegradable Polymer ◽  
Structural Integrity ◽  
Thermal Ageing ◽  
Engineering Properties ◽  
Sustainable Technologies ◽  
Hygrothermal Ageing ◽  
Potential Applications ◽  
Practical Tool

Biodegradable polymers (BP) are often regarded as the materials of the future, which address the rising environmental concerns. The advancement of biorefineries and sustainable technologies has yielded various BP with excellent properties comparable to commodity plastics. Water resistance, high dimensional stability, processability and excellent physicochemical properties limit the reviewed materials to biodegradable polyesters and modified compositions of starch and cellulose, both known for their abundance and relatively low price. The addition of different nanofillers and preparation of polymer nanocomposites can effectively improve BP with controlled functional properties and change the rate of degradation. The lack of data on the durability of biodegradable polymer nanocomposites (BPN) has been the motivation for the current review that summarizes recent literature data on environmental ageing of BPN and the role of nanofillers, their basic engineering properties and potential applications. Various durability tests discussed thermal ageing, photo-oxidative ageing, water absorption, hygrothermal ageing and creep testing. It was discussed that incorporating nanofillers into BP could attenuate the loss of mechanical properties and improve durability. Although, in the case of poor dispersion, the addition of the nanofillers can lead to even faster degradation, depending on the structural integrity and the state of interfacial adhesion. Selected models that describe the durability performance of BPN were considered in the review. These can be applied as a practical tool to design BPN with tailored property degradationand durability.

scholarly journals Polymeric Nanocomposites Membranes with High Permittivity Based on PVA-ZnO Nanoparticles for Potential Applications in Flexible Electronics

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1370 ◽  
Author(s):  
Roberto Ambrosio ◽  
Amanda Carrillo ◽  
Maria Mota ◽  
Karla de la Torre ◽  
Richard Torrealba ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Zno Nanoparticles ◽  
Flexible Electronics ◽  
Poly Vinyl Alcohol ◽  
Polymeric Nanocomposites ◽  
Arrhenius Behavior ◽  
High Permittivity ◽  
Potential Applications

This study reports the optical, structural, electrical and dielectric properties of Poly (vinyl alcohol) thin films membranes with embedded ZnO nanoparticles (PVA/ZnO) obtained by the solution casting method at low temperature of deposition. Fourier Transform Infrared spectra showed the characteristics peaks, which correspond to O–H and Zn–O bonds present in the hybrid material. The X-ray diffraction patterns indicated the presence of ZnO structure into the films. The composite material showed low absorbance and a wide band of gap energy from 5.5 to 5.83 eV. The surface morphology for the thin films of PVA/ZnO was studied by Atomic Force Microscopy and Scanning Electron Microscopy. The electrical properties of the membranes were also characterized by current-voltage characteristics and the DC conductivity showed Arrhenius behavior with values of activation energy from 0.62 to 0.78 eV and maximum conductivity at 2.4 × 10−12 S/cm. The dielectric properties of the nanocomposites were measured from low to high frequencies, and the results showed a high dielectric constant (ε) in the order of 104 at low frequency and values from ε ≈ 2000 to 100 in the range of 1 KHz–1 MHz respectively. The properties of PVA/ZnO such as the high permittivity and the low temperature of processing make it a suitable material for potential applications in the development of flexible electronic devices.

A REVIEW OF THE APPLICATIONS OF NANOCARBON POLYMER COMPOSITES

NANO ◽  
2011 ◽  
Vol 06 (03) ◽  
pp. 185-203 ◽  
Author(s):  
ATEEQ RAHMAN ◽  
ILIAS ALI ◽  
SAEED M. AL ZAHRANI ◽  
RABEH H. ELEITHY
Keyword(s):  
Composite Materials ◽  
Polymer Composites ◽  
Polymer Nanocomposites ◽  
High Performance ◽  
Research Field ◽  
Nitrile Rubber ◽  
Molecular Scale ◽  
Broad Array ◽  
Potential Applications ◽  
Tyre Industry

Nanotechnology offers fundamentally new capabilities to architect a broad array of novel materials, composites and structures on a molecular scale. It is potentially capable of redefining the methods used for developing lighter, stronger, high-performance structures and processes with unique and nontraditional properties. This review summarizes different classes of nanocarbon-based polymer composites and their applications. Also, it highlights different ways to create smaller, cheaper, lighter and faster devices using nanocarbon-based polymer composites. The potential applications of such materials are in the fields of membrane, aviation, electronics, polymer composites, as well as the marine and transport industries. A detailed description of nanocarbon-based composite materials manufactured from PE, PP, PS, PS, PVC, PPS, ABS, PMMA, nitrile rubber, etc. is also reviewed. Some of the major applications of carbon-based polymer nanocomposites are in the tyre industry, semiconductors, and many more, which has brought about the new, developing and exciting research field called nanoscience.

Dielectric Properties of Polymer Composites with Nanocarbon Allotropes

2019 ◽  
Vol 3 (2) ◽  
pp. 85-97
Author(s):  
Vitaliy G. Shevchenko ◽  
Polina M. Nedorezova ◽  
Alexander N. Ozerin
Keyword(s):  
Electrical Conductivity ◽  
Dielectric Properties ◽  
Electrical Properties ◽  
Electromagnetic Radiation ◽  
Polymer Composites ◽  
Polymer Nanocomposites ◽  
Interfacial Polarization ◽  
Ac Electrical Conductivity ◽  
Practical Applications ◽  
Carbon Allotropes

Background:The paper describes the types and electrical properties of polymer nanocomposites containing carbon allotropes.Objective:Direct current conductivity, conduction in percolation systems, conduction mechanisms and factors controlling conductivity and percolation parameters are considered.Method:The dielectric properties of polymer nanocomposites are presented, and experimental methods and methods for analyzing the results have also been described. An analysis of the data on ac electrical conductivity, including the contribution of nanofiller - interfacial polarization is presented. Special consideration is given to the role of nanocarbons as dielectric probes.Results:The microwave properties of polymer nanocomposites, their use to estimate the distribution of nanofiller in the matrix, as well as practical applications for shielding and absorption of electromagnetic radiation have been analyzed.Conclusion:The use of carbon allotropes nanoparticles as fillers with high electrical conductivity provides polymer composites with useful electrical properties, including the ability to absorb highfrequency electromagnetic radiation.

scholarly journals Polymeric Nanocomposites Membranes with High Permittivity Based on PVA-ZnO Nanoparticles for Potential Applications in Flexible Electronics

2018 ◽  
Author(s):  
Roberto Ambrosio ◽  
Amanda Carrillo ◽  
Maria de la Luz Mota ◽  
Karla de la Torre ◽  
Richard TorreAlba ◽  
...  
Keyword(s):  
Thin Films ◽  
Dielectric Properties ◽  
Low Temperature ◽  
Zno Nanoparticles ◽  
Flexible Electronics ◽  
Poly Vinyl Alcohol ◽  
Polymeric Nanocomposites ◽  
High Permittivity ◽  
Suitable Material ◽  
Potential Applications

In this study is reported the optical, structural and dielectric properties of Poly (vinyl alcohol) thin films membranes with embedded ZnO nanoparticles (PVA/ZnO) obtained by solution casting method at low temperature of deposition. Fourier Transform Infrared spectra showed the characteristics peaks, which correspond to O-H and Zn-O bonds present in the hybrid material. The X-ray diffraction patterns indicated the presence of ZnO structure into the films. The composite material showed low absorbance and a wide band gap energy from 5.6 to 5.9 eV. The surface morphology for the thin films of PVA/ZnO was studied by Atomic Force Microscopy and Scanning Electron Microscopy. The dielectric properties of the nanocomposites were measured from low to high frequencies, the results showed a high dielectric constant (ε) in the order of 104 at low frequency and values from ε ≈ 2000 to 100 in the range of 1KHz-1MHz respectively, the properties of PVA/ZnO such as the high permittivity and the low temperature of processing make it a suitable material for potential applications in the development of flexible electronic devices.

Progress and perspectives on halide lithium conductors for all-solid-state lithium batteries

2020 ◽  
Vol 13 (5) ◽  
pp. 1429-1461 ◽  
Author(s):  
Xiaona Li ◽  
Jianwen Liang ◽  
Xiaofei Yang ◽  
Keegan R. Adair ◽  
Changhong Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Solid State ◽  
Lithium Batteries ◽  
Electrochemical Stability ◽  
Superionic Conductors ◽  
Fundamental Understanding ◽  
Potential Applications ◽  
Synthesis Routes

This review focuses on fundamental understanding, various synthesis routes, chemical/electrochemical stability of halide-based lithium superionic conductors, and their potential applications in energy storage as well as related challenges.

Imaging of Pancreatic-Neuroendocrine Tumours: An Outline of Conventional Radiological Techniques

2019 ◽  
Vol 12 (2) ◽  
pp. 135-155 ◽  
Author(s):  
Muhammad Affan Zamir ◽  
Wasim Hakim ◽  
Siraj Yusuf ◽  
Robert Thomas
Keyword(s):  
Neuroendocrine Tumours ◽  
Treatment Options ◽  
Advantages And Disadvantages ◽  
Imaging Characteristics ◽  
Fundamental Understanding ◽  
Pancreatic Neuroendocrine Tumours ◽  
Direct Management ◽  
Important Disease ◽  
Similar Imaging

IIntroduction: Pancreatic Neuroendocrine Tumours (p-NETs) are an important disease entity and comprise of peptide-secreting tumours often with a functional syndrome. : Accounting for a small percentage of all pancreatic tumours, they have a good overall survival rate when diagnosed early, with surgery being curative. The role of nuclear medicine in the diagnosis and treatment of these tumours is evident. However, the vast majority of patients will require extensive imaging in the form of conventional radiological techniques. It is important for clinicians to have a fundamental understanding of the p-NET appearances to aid prompt identification and to help direct management through neoplastic staging. Methods: This article will review the advantages and disadvantages of conventional radiological techniques in the context of p-NETs and highlight features that these tumours exhibit. Conclusion: Pancreatic neuroendocrine tumours are a unique collection of neoplasms that have markedly disparate clinical features but similar imaging characteristics. Most p-NETs are small and welldefined with homogenous enhancement following contrast administration, although larger and less welldifferentiated tumours can demonstrate areas of necrosis and cystic architecture with heterogeneous enhancement characteristics. : Prognosis is generally favourable for these tumours with various treatment options available. However, conventional radiological techniques will remain the foundation for the initial diagnosis and staging of these tumours, and a grasp of these modalities is extremely important for physicians.

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