scholarly journals Three-dimensional porous carbon derived from different organic acid salts for application in electrochemical sensing

RSC Advances ◽  
2021 ◽  
Vol 11 (50) ◽  
pp. 31834-31844
Author(s):  
Xiaoyue Yue ◽  
Yan Li ◽  
Min Li ◽  
Xiaoyu Luo ◽  
Yanhong Bai
Keyword(s):  
Porous Carbon ◽  
Sodium Succinate ◽  
Three Dimensional ◽  
Electrochemical Sensing ◽  
Side Chain ◽  
Hydroxyl Groups ◽  
Organic Salts ◽  
One Step ◽  
The One ◽  
Sodium Malate

Three-dimensional porous carbon materials were synthesized by the one-step pyrolysis of organic salts with different numbers of hydroxyl groups on the side chain (sodium tartrate, sodium malate and sodium succinate).

scholarly journals Performance Analysis and Optimization of CRNs Based on Fixed Feedback Probability Mechanism with Two Classes of Secondary Users

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yuan Zhao ◽  
Hongyi Li ◽  
Jiemin Liu
Keyword(s):  
Performance Indicators ◽  
Three Dimensional ◽  
Secondary Users ◽  
Lower Priority ◽  
Fixed Parameter ◽  
One Step ◽  
The One ◽  
The Impact ◽  
Retransmission Control ◽  
Transfer Probability

In this paper, we conduct a research based on the classified secondary users (SUs). SUs are divided into two categories: higher-priority SU1 and lower-priority SU2, and two types of users generate two types of packets, respectively. Due to the lowest spectrum usage rights of SU2 packets, the SU2 packets’ transmission is easily interrupted by other packets with higher rights. With the purpose of controlling the SU2 packets’ retransmission behavior, we introduce two system parameters, namely, feedback threshold T and feedback probability q. When the amount of SU2 packets in the buffer reaches the feedback threshold T, the interrupted SU2 packets either enter the buffer with probability q for retransmission or leave the channel by probability 1−q, where q is a fixed parameter. We construct a three-dimensional Markov model based on the presented retransmission control mechanism and derive some important performance indicators of SU2 packets based on the one-step transfer probability matrix and steady-state distribution. Then, we analyze the impact of some key parameters on the performance indicators through numerical experiments. Finally, we establish a cost function and use particle swarm optimization algorithm to optimize the feedback threshold and feedback probability.

scholarly journals (3Z)-3-[(Z)-2-(2-Oxoindolin-3-ylidene)hydrazin-1-ylidene]indolin-2-one 0.17-hydrate

2014 ◽  
Vol 70 (6) ◽  
pp. o721-o721
Author(s):  
Yong-Hong Liu ◽  
Lei Zhao ◽  
Ming-Xuan Liu ◽  
Hai Lin ◽  
Jing-Jing Li
Keyword(s):  
Hydrogen Bonds ◽  
Microwave Irradiation ◽  
Organic Molecule ◽  
Condensation Reaction ◽  
Three Dimensional ◽  
Water Molecules ◽  
Inversion Symmetry ◽  
Compound C ◽  
One Step ◽  
The One

In the title compound, C16H10N4O2·0.17H2O, prepared by the one-step condensation reaction of isatin with hydrazine hydrate under microwave irradiation, the complete organic molecule is generated by crystallographic inversion symmetry and therefore exists in anS-transconformation. In the crystal, molecules are linked by N—H...O hydrogen bonds, generating a three-dimensional framework with [001] channels, which are occupied by the disordered water molecules.

High-performance electrochemical sensing platform based on sodium alginate-derived 3D hierarchically porous carbon for simultaneous determination of dihydroxybenzene isomers

2021 ◽  
Author(s):  
Liang Wei ◽  
Xinlong Huang ◽  
Xianqian Zhang ◽  
Xiande Yang ◽  
Jing Yang ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Simultaneous Determination ◽  
Porous Carbon ◽  
High Performance ◽  
Three Dimensional ◽  
Electrochemical Sensing ◽  
Dihydroxybenzene Isomers ◽  
Hierarchically Porous ◽  
Sensing Platform

A selective and sensitive electrochemical sensor based on three-dimensional hierarchically porous carbon was developed for simultaneous determination of dihydroxybenzene isomers.

scholarly journals A Facile Green Fabrication and Characterization of Cellulose-Silver Nanoparticle Composite Sheets for an Antimicrobial Food Packaging

2021 ◽  
Vol 8 ◽  
Author(s):  
Seongyoung Kwon ◽  
Wooseok Lee ◽  
Jung Wook Choi ◽  
Nattinee Bumbudsanpharoke ◽  
Seonghyuk Ko
Keyword(s):  
Photoelectron Spectroscopy ◽  
Food Packaging ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Hydroxyl Groups ◽  
Green Approach ◽  
Vis Spectroscopy ◽  
One Step ◽  
The One

The present study focused on a facile and green approach for the one-step synthesis of silver nanoparticles (AgNPs) embedded in hard wood bleached kraft fiber. The hydroxyl groups on the cellulose chain induced ionic silver reduction with additional hydrothermal energy, allowing for the in situ formation and deposition of AgNPs on the cellulose fiber. The white color of the bleached fiber transformed to yellow due to the formation of AgNPs. UV-Vis spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy revealed that the AgNPs were uniformly distributed across the surface of the obtained cellulose fibers. The results indicated that the formation and distribution of AgNPs on surface of cellulose fibers was significantly influenced by the amount and concentration of silver nitrate (AgNO3). The antimicrobial activity of the cellulose-AgNP composite sheet against Escherichia coli was found to be inhibiting. These findings imply that cellulose-AgNP composite sheets can be feasibly used as antimicrobial paper for food packaging.

Poly(2-aminothiazole) as a unique precursor for nitrogen and sulfur co-doped porous carbon: immobilization of very small gold nanoparticles and its catalytic application

RSC Advances ◽  
2015 ◽  
Vol 5 (78) ◽  
pp. 63421-63428 ◽  
Author(s):  
Yasamin Bide ◽  
Mohammad Reza Nabid ◽  
Fateme Dastar
Keyword(s):  
Gold Nanoparticles ◽  
Porous Carbon ◽  
Carbon Materials ◽  
Plate Structure ◽  
Porous Carbon Materials ◽  
Catalytic Application ◽  
One Step ◽  
The One ◽  
Co Doped

We report the synthesis of poly(2-aminothiaozle) with a plate structure containing nanoparticles, and the one-step synthesis of nitrogen and sulfur co-doped porous carbon materials using P2AT as the source of both N and S.

A novel ascorbic acid electrochemical sensor based on spherical MOF-5 arrayed on a three-dimensional porous carbon electrode

2016 ◽  
Vol 8 (10) ◽  
pp. 2290-2296 ◽  
Author(s):  
Yonggui Song ◽  
Couchong Gong ◽  
Dan Su ◽  
Yuan Shen ◽  
Yonghai Song ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Electrochemical Sensor ◽  
Porous Carbon ◽  
Three Dimensional ◽  
Carbon Composites ◽  
Carbon Electrode ◽  
Step Method ◽  
One Step ◽  
Porous Carbon Electrode

The MOF-5 microstructures supported by three-dimensional kenaf stem-derived porous carbon composites were constructedviausing a simple one-step method for ascorbic acid sensing.

scholarly journals Preparation and Electrical Properties of Polyacrylonitrile Based Porous Carbon by Different Activation Methods

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3499
Author(s):  
Xiaoqiang Wang ◽  
Yifan Tan ◽  
Meijiao Sun ◽  
Binbin Yu ◽  
Junhe Yang ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Porous Carbon ◽  
Activation Method ◽  
Polymer Microsphere ◽  
One Step ◽  
Activating Agent ◽  
The One

Polyacrylonitrile (PAN)-based porous carbon was prepared by different methods of activation with PAN polymer microsphere as precursor. The morphology, structure and electrical properties for supercapacitor of the porous carbon were investigated. It was found that the morphology of PAN nanospheres tended to be destroyed in the process of one-step activation (activation and carbonization were carried out simultaneously, and could only be retained when the amount of activating agent KOH was small). While the spherical morphology could be well reserved during the two-step activation method (carbonization and activation sequentially). The specific surface area and pore volume increased first and then decreased, with the increase in activation holding time for both one-step and two-step activation methods. The specific surface area reached the maximum value with 2430 m2 g−1 for the one-step activation method and 2830 m2 g−1 for the two-step activation method. Additionally, their mass-specific capacitances were 178.8 F g−1 and 160.2 F g−1, respectively, under the current density of 1 A g−1. After 2000 cycles, the specific capacitance retentions were 92.9% and 91.3%.

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