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RISS 인기검색어
- 검색키워드
- 저자 : Guangdong Sun (검색결과 4 건)
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A larger nonvolatile bipolar resistive switching memory behaviour fabricated using eggshells
Guangdong Zhou,Bai Sun,Ankun Zhou,Bo Wu,Haishen Huang 한국물리학회 2017 Current Applied Physics Vol.17 No.2
Resistive random access memory (RRAM) devices have emerged as promising candidates for near future nonvolatile information storage. Eggshells, a food waste, have not been focused and recycled sustainably today. Eggshell-based devices have shown a large resistive-switching(RS) memory behaviors with favorable resistance ratio of ~103, larger memory window of ~3.5 V, and high endurance and retention performance. Redox-based Ag filament models involving the formation and rupture of the metallic conduction filaments between top and bottom electrodes are proposed to interpret the large nonvolatile bipolar RS memory behaviors. This discovery provides for the possibility of an environmentally friendly, low-cost and sustainable material application in the next-generation nonvolatile date storage device
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Hengyun Sun,Yu Liu,Ting Jiang,Xia Liu,Aijuan He,Jie Li,Wenjie Zhang,Wei Liu,Yilin Cao,Guangdong Zhou 한국조직공학과 재생의학회 2014 조직공학과 재생의학 Vol.11 No.1
Due to lack of optimal inductive protocols, how to effectively improve chondrogenesis of adipose-derived stem cells (ASCs) is still a great challenge. Our previous studies demonstrated that the culture media derived from chondrocyte-scaffold constructs (conditional media) contained various soluble chondrogenic factors and were effective for directing chondrogenic differentiation of bone marrow stem cells. Nevertheless, it remains unclear whether the conditional media can induce ASCs towards chondrogenic differentiation, especially for three-dimensional (3D) cartilage formation in a preshaped scaffold. In this study, it demonstrated that the conditional media derived from chondrocyte-scaffold constructs could promote ASCs to differentiate into chondrocyte-like cells, with similar expression of type II collagen to those induced by chondrogenic growth factors. Moreover, the expression level of chondrocyte-specific genes, such as SOX9, type II collagen, and COMP, was even higher in conditional medium group (CM) than that in optimized chondrogenic growth factor group (GF), indicating that the conditional media can serve as an effective inducer for chondrogenic differentiation of ASCs. Most importantly, the conditional media could also induce ASC-scaffold constructs to form 3D cartilage-like tissue with typical lacunae structures and positive expression of cartilage specific matrices, even higher contents of GAG and type II collagen were achieved in CM group compared to GF group. The current study establishes a simple, but stable, efficient, and economical method for directing 3D cartilage formation of ASCs, a strategy that may be more closely applicable for repairing cartilage defects.
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Mechanism analysis of switching direction transformation in an Er2O3 based RRAM device
Shuangsuo Mao,Guangdong Zhou,Bai Sun,Hosameldeen Elshekh,Xiaohua Zhang,Xiaohua Zhang,Feng Yang,Yong Zhao 한국물리학회 2019 Current Applied Physics Vol.19 No.12
The resistive random access memory (RRAM) based on resistive switching effect has considered to be the most advanced next generation memory, in which the switching direction determines the order of reading-writing. In this work, the rare-earth metal Er2O3 was used as functional layer, and Ag and indium-tin-oxide (ITO) are selected as top and bottom electrode to fabricate resistive switching device. Further, it is observed that the switching direction and memory window of resistive switching device can be regulated by exchanging top and bottom electrode. Moreover, the complementary switching memory behavior in Ag/Er2O3/ITO/Er2O3/Ag structure was also observed. Through mechanism analysis, it is expected that the barrier changes and metal-ions oxidation-reduction should be responsible for the conversion of switching direction and regulation of memory window. This work opens up a way to the development of next generation new concept memory.
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Duchao Feng,Luyang Qiao,Guangdong Sun,Kangjing Hong,Mingyue Wu,Chenglong Wang,Jinhuan Zheng 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10
A magnetic field-driven photocurable superhydrophobic fabric coating technology was developed in this study. The coating, consisting of photoreactive carbonyl iron powder (CIP) assembled hydrophobic micro-nano structures, was constructed on the surface of polyester fabric by combining the magnetic field-driven assembly technology and blue light photocuring technology. Camphorquinone (CQ), ethyl 4-dimethylaminobenzoate (EDB) and diphenyliodonium hexafluorophosphate (DPI) were served as the photoinitiator formulation, while polyurethane diacrylate and hydroxyethyl acrylate (HEA) were used as the polymerization-cross-linking matrix for photocurable coating. Photo-differential scanning calorimetry (Photo-DSC) and rheometry were used to characterize the performance of coating formulations. Optical contact angle meter and scanning electron microscope (SEM) were used in combination with tensile performance test to explore the construction of superhydrophobic structure on coating surface induced by magnetic field. The optimal formulation of photoinitiators for coatings with excellent photopolymerization performance has been definitively established. Photocured coating film displayed a distinct hydrophobicity (the water contact angle is approx. 152.7°, and the sliding angle is approx. 7.2°) when the mass ratio of CIP to polymeric components was 1:1. The coated fabric eventually exhibited a satisfactory hydrophobicity (the water contact angle is approx. 153.3°) and mechanical properties.
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