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Nayak PP, Kini S, Ginjupalli K, Pai D. Effect of shape of titanium dioxide nanofillers on the properties of dental composites. Odontology 2023:10.1007/s10266-023-00784-2. [PMID: 36633793 DOI: 10.1007/s10266-023-00784-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Accepted: 01/06/2023] [Indexed: 01/13/2023]
Abstract
The main objective of the present study was to evaluate the effect of the morphology of titanium dioxide nanofillers on the flexural strength and shear bond strength of the dental composite. Spherical and rhombic-shaped nano titanium dioxide fillers were synthesized via solvothermal method and were characterized. Subsequently, these fillers were incorporated into a flowable composite (Filtek™ Z350 XT Flowable Restorative) at 0.5 wt.% and 1.5 wt.% and the prepared specimens were stored in water for 24 h. The specimens were then evaluated for flexural strength using a universal testing machine. Similarly, the shear bond strength of modified composites to the tooth was evaluated and bond failures were analyzed using stereomicroscope magnification. Incorporation of nanofillers significantly enhanced the flexural strength of flowable composite (p = 0.009) with a significant increase at 0.5wt.% of spherical (p = 0.015) and rhomboidal-shaped fillers (p = 0.010). However, no statistically significant difference in flexural strength was observed among the different shapes of nanofillers. The results of our study did not show a significant effect on the shear bond strength of the composites. Thus the reinforcing ability of titanium dioxide nanofillers on dental composite was confirmed in this study, although the effect of using nanofillers with different morphology was not significant.
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Affiliation(s)
- Prajna P Nayak
- Department of Pedodontics and Preventive Dentistry, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.,Department of Pedodontics and Preventive Dentistry, Nitte (Deemed to Be University), AB Shetty Memorial Institute of Dental Sciences (ABSMIDS), Deralakatte, Mangalore, Karnataka, 575018, India
| | - Sudarshan Kini
- Nitte (Deemed to Be Univerisity), Nitte University Centre for Science Education and Research, Paneer Campus, Deralakatte, Mangalore, Karnataka, 575018, India
| | - Kishore Ginjupalli
- Department of Dental Materials, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Deepika Pai
- Department of Pedodontics and Preventive Dentistry, Manipal College of Dental Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India.
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Wang L, Zhang Y, Zhang P, Wen D. Flexible Transient Resistive Memory Based on Biodegradable Composites. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:nano12193531. [PMID: 36234659 PMCID: PMC9565246 DOI: 10.3390/nano12193531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/30/2022] [Accepted: 10/04/2022] [Indexed: 06/12/2023]
Abstract
Physical transient electronics have attracted more attention as the basis for building green electronics and biomedical devices. However, there are difficulties in selecting materials for the fabricated devices to take into account both biodegradability and high performance. In this paper, a physically transient resistive random-access memory (RRAM) device was fabricated by using egg protein and graphene quantum dot composites as active layers. The sandwich structure composed of Al/EA:GQD/ITO shows a good write-once-multiple-read memory characteristic, and the introduced GQD improves the switching current ratio of the device. By using the sensitivity of GQDs to ultraviolet light, the logic operation of the "OR gate" is completed. Furthermore, the device exhibits a physical transient behavior and good biodegradability due to the dissolution behavior in deionized water. These results suggest that the device is a favorable candidate for the construction of memory elements for transient electronic systems.
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Affiliation(s)
- Lu Wang
- Correspondence: ; Tel.: +86-188-4502-5666
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Illarionov GA, Morozova SM, Chrishtop VV, Einarsrud MA, Morozov MI. Memristive TiO 2: Synthesis, Technologies, and Applications. Front Chem 2020; 8:724. [PMID: 33134249 PMCID: PMC7567014 DOI: 10.3389/fchem.2020.00724] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 07/14/2020] [Indexed: 11/13/2022] Open
Abstract
Titanium dioxide (TiO2) is one of the most widely used materials in resistive switching applications, including random-access memory, neuromorphic computing, biohybrid interfaces, and sensors. Most of these applications are still at an early stage of development and have technological challenges and a lack of fundamental comprehension. Furthermore, the functional memristive properties of TiO2 thin films are heavily dependent on their processing methods, including the synthesis, fabrication, and post-fabrication treatment. Here, we outline and summarize the key milestone achievements, recent advances, and challenges related to the synthesis, technology, and applications of memristive TiO2. Following a brief introduction, we provide an overview of the major areas of application of TiO2-based memristive devices and discuss their synthesis, fabrication, and post-fabrication processing, as well as their functional properties.
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Affiliation(s)
- Georgii A. Illarionov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, St. Petersburg, Russia
| | - Sofia M. Morozova
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, St. Petersburg, Russia
| | - Vladimir V. Chrishtop
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, St. Petersburg, Russia
| | - Mari-Ann Einarsrud
- Department of Material Science and Engineering, NTNU Norwegian University of Science and Technology, Trondheim, Norway
| | - Maxim I. Morozov
- Laboratory of Solution Chemistry of Advanced Materials and Technologies, ITMO University, St. Petersburg, Russia
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Synthesis, Characterization and Photocatalytic Activity of Nanocrystalline First Transition-Metal (Ti, Mn, Co, Ni and Zn) Oxisde Nanofibers by Electrospinning. APPLIED SCIENCES-BASEL 2018. [DOI: 10.3390/app9010008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In this work, five nanocrystalline first transition-metal (Ti, Mn, Co, Ni and Zn) oxide nanofibers were prepared by electrospinning and controlled calcination. The morphology, crystal structure, pore size distribution and specific surface area were systematically studied by scanning electron microscope (SEM), transmission electron microscope (TEM), surface and pore analysis, and thermo gravimetric analyzer (TGA). The results reveal that the obtained nanofibers have a continuously twisted three-dimensional scaffold structure and are composed of neat nanocrystals with a necklace-like arrangement. All the samples possess high specific surface areas, which follow the order of NiO nanofiber (393.645 m2/g) > TiO2 nanofiber (121.445 m2/g) > ZnO nanofiber (57.219 m2/g) > Co3O4 nanofiber (52.717 m2/g) > Mn2O3 nanofiber (18.600 m2/g). Moreover, the photocatalytic degradation of methylene blue (MB) in aqueous solution was investigated in detail by employing the five kinds of metal oxide nanofibers as photocatalysts under ultraviolet (UV) irradiation separately. The results show that ZnO, TiO2 and NiO nanofibers exhibit excellent photocatalytic efficiency and high cycling ability to MB, which may be ascribed to unique porous structures and the highly efficient separation of photogenerated electron-hole pairs. In brief, this paper aims to provide a feasible approach to achieve five first transition-metal oxide nanofibers with excellent performance, which is important for practical applications.
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Yang S, Schmidt DO, Khetan A, Schrader F, Jakobi S, Homberger M, Noyong M, Paulus A, Kungl H, Eichel RA, Pitsch H, Simon U. Electrochemical and Electronic Charge Transport Properties of Ni-Doped LiMn₂O₄ Spinel Obtained from Polyol-Mediated Synthesis. MATERIALS 2018; 11:ma11050806. [PMID: 29772663 PMCID: PMC5978183 DOI: 10.3390/ma11050806] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 05/09/2018] [Accepted: 05/14/2018] [Indexed: 12/26/2022]
Abstract
LiNi0.5Mn1.5O4 (LNMO) spinel has been extensively investigated as one of the most promising high-voltage cathode candidates for lithium-ion batteries. The electrochemical performance of LNMO, especially its rate performance, seems to be governed by its crystallographic structure, which is strongly influenced by the preparation methods. Conventionally, LNMO materials are prepared via solid-state reactions, which typically lead to microscaled particles with only limited control over the particle size and morphology. In this work, we prepared Ni-doped LiMn2O4 (LMO) spinel via the polyol method. The cycling stability and rate capability of the synthesized material are found to be comparable to the ones reported in literature. Furthermore, its electronic charge transport properties were investigated by local electrical transport measurements on individual particles by means of a nanorobotics setup in a scanning electron microscope, as well as by performing DFT calculations. We found that the scarcity of Mn3+ in the LNMO leads to a significant decrease in electronic conductivity as compared to undoped LMO, which had no obvious effect on the rate capability of the two materials. Our results suggest that the rate capability of LNMO and LMO materials is not limited by the electronic conductivity of the fully lithiated materials.
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Affiliation(s)
- Shuo Yang
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
| | - Dirk Oliver Schmidt
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
| | - Abhishek Khetan
- Institute for Combustion Technology, RWTH Aachen University, 52056 Aachen, Germany.
| | - Felix Schrader
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
| | - Simon Jakobi
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
| | - Melanie Homberger
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
| | - Michael Noyong
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
| | - Anja Paulus
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
- Institute of Energy and Climate Research IEK-9: Fundamental Electrochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany.
| | - Hans Kungl
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
- Institute of Energy and Climate Research IEK-9: Fundamental Electrochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany.
| | - Rüdiger-Albert Eichel
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
- Institute of Energy and Climate Research IEK-9: Fundamental Electrochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany.
- Institute of Physical Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
| | - Heinz Pitsch
- Institute for Combustion Technology, RWTH Aachen University, 52056 Aachen, Germany.
| | - Ulrich Simon
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
- Jülich Aachen Research Alliance-JARA, 52428 Jülich, Germany.
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Lamberti A. ZnO- and TiO₂-Based Nanostructures. NANOMATERIALS 2018; 8:nano8050325. [PMID: 29757977 PMCID: PMC5977339 DOI: 10.3390/nano8050325] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 05/08/2018] [Accepted: 05/10/2018] [Indexed: 11/16/2022]
Affiliation(s)
- Andrea Lamberti
- Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129 Turin, Italy.
- Center for Sustainable Future Technologies, Istituto Italiano di Tecnologia (IIT@Polito), C.so Trento 21, 10129 Turin, Italy.
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Modifying Thermal Switchability of Liquid Crystalline Nanoparticles by Alkyl Ligands Variation. NANOMATERIALS 2018. [PMID: 29518916 PMCID: PMC5869638 DOI: 10.3390/nano8030147] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
By coating plasmonic nanoparticles (NPs) with thermally responsive liquid crystals (LCs) it is possible to prepare reversibly reconfigurable plasmonic nanomaterials with prospective applications in optoelectronic devices. However, simple and versatile methods to precisely tailor properties of liquid-crystalline nanoparticles (LC NPs) are still required. Here, we report a new method for tuning structural properties of assemblies of nanoparticles grafted with a mixture of promesogenic and alkyl thiols, by varying design of the latter. As a model system, we used Ag and Au nanoparticles that were coated with three-ring promesogenic molecules and dodecanethiol ligand. These LC NPs self-assemble into switchable lamellar (Ag NPs) or tetragonal (Au NPs) aggregates, as determined with small angle X-ray diffraction and transmission electron microscopy. Reconfigurable assemblies of Au NPs with different unit cell symmetry (orthorombic) are formed if hexadecanethiol and 1H,1H,2H,2H-perfluorodecanethiol were used in the place of dodecanethiol; in the case of Ag NPs the use of 11-hydroxyundecanethiol promotes formation of a lamellar structure as in the reference system, although with substantially broader range of thermal stability (140 vs. 90 °C). Our results underline the importance of alkyl ligand functionalities in determining structural properties of liquid-crystalline nanoparticles, and, more generally, broaden the scope of synthetic tools available for tailoring properties of reversibly reconfigurable plasmonic nanomaterials.
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