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RISS 인기검색어
- 검색키워드
- 저자 : Abbas Z. Kouzani (검색결과 2 건)
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Bijan Nasri-Nasrabadi,Akif Kaynak,Cynthia Wong,Pejman Heidarian,Khashayar Badii,Abbas Z. Kouzani 한국섬유공학회 2019 Fibers and polymers Vol.20 No.1
The fabrication of hydrophilic porous hydrogel, with high mechanical strength and good uptake capacity is desirable for a broad range of applications such as drug delivery and liquid sensors. The usual methods are limited to the production of structures with high density of covalently crosslinked networks that restricts the polymer chain rearrangement, resulting in non-uniformed pore size distribution. Covalent networks also limit the activity of functional groups and influence the uptake properties of the polymer. In this study, we proposed simple cyclic cryogelation for the fabrication of hydrogels with uniform pore sizes via controlling the micellization and crystal formation. The chitosan based hydrogels ionically crosslinked with 8 % (w/v) of tripoli phosphate sodium (TPP) displayed high Young’s modulus (63 MPa) after cyclic freezethawing. The liquid uptake capacity of the samples treated with 8 % (w/v) TPP solution at pH 4 showed a slight decrease of about 29 % in comparison to that of non-cyclic processed samples (36 %).
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Advanced Design, Fabrication, and Applications of 3D-Printable Piezoelectric Nanogenerators
M. A. Parvez Mahmud,Partho Adhikary,Ali Zolfagharian,Scott Adams,Akif Kaynak,Abbas Z. Kouzani 대한금속·재료학회 2022 ELECTRONIC MATERIALS LETTERS Vol.18 No.2
Piezoelectric nanogenerator (PENG) is a leading-edge mechanical energy harvesting device used in portable power supplyand self-powered sensor systems. Advanced 3D printers have been recently used to create 3D printed (3DP) PENGs. This hasfacilitated the rapid fabrication of PENGs and their integration into wearable electronics, biomedical systems, and internetof things devices. However, researchers face several critical challenges in developing robust 3DP-PENGs that can produceadequate electrical energy for self-powered systems. Therefore, this review on 3DP-PENGs is conducted to highlight theirrecent developments and challenges. This paper presents the latest 3D-printed piezoelectric nanogenerators in terms of theirmaterials selection and functionalization, design and architecture formation, and applications including pressure sensors,fl ow sensors, microphones, and implants. Finally, crucial challenges and optimization strategies that considerably impactthe output performance of 3DP-PENGs, along with a roadmap for their future enhancement are given. It is envisioned thatthis work will help reduce the gap between 3D printing and PENG technologies and accelerate the research and developmentof 3DP-PENGs.
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