Organic nonvolatile memory by controlling the dynamic copper-ion concentration within organic layer

2004 ◽  
Vol 84 (24) ◽  
pp. 4908-4910 ◽  
Author(s):  
Liping Ma ◽  
Qianfei Xu ◽  
Yang Yang
Keyword(s):  
Nonvolatile Memory ◽  
Copper Ion ◽  
Ion Concentration ◽  
Organic Layer

scholarly journals Commonalities between Copper Neurotoxicity and Alzheimer’s Disease

Toxics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 4
Author(s):  
Roshni Patel ◽  
Michael Aschner
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Structural Changes ◽  
Copper Ion ◽  
Plaque Formation ◽  
Ion Concentration ◽  
Medical Community ◽  
Disease Etiology ◽  
Parent Protein ◽  
Lead Zinc

Alzheimer’s disease, a highly prevalent form of dementia, targets neuron function beginning from the hippocampal region and expanding outwards. Alzheimer’s disease is caused by elevated levels of heavy metals, such as lead, zinc, and copper. Copper is found in many areas of daily life, raising a concern as to how this metal and Alzheimer’s disease are related. Previous studies have not identified the common pathways between excess copper and Alzheimer’s disease etiology. Our review corroborates that both copper and Alzheimer’s disease target the hippocampus, cerebral cortex, cerebellum, and brainstem, affecting motor skills and critical thinking. Additionally, Aβ plaque formation was analyzed beginning from synthesis at the APP parent protein site until Aβ plaque formation was completed. Structural changes were also noted. Further analysis revealed a relationship between amyloid-beta plaques and copper ion concentration. As copper ion levels increased, it bound to the Aβ monomer, expediting the plaque formation process, and furthering neurodegeneration. These conclusions can be utilized in the medical community to further research on the etiology of Alzheimer’s disease and its relationships to copper and other metal-induced neurotoxicity.

scholarly journals Development of Miniaturized Water Quality Monitoring System Using Wireless Communication

Sensors ◽  
2019 ◽  
Vol 19 (17) ◽  
pp. 3758
Author(s):  
Hsing-Cheng Yu ◽  
Ming-Yang Tsai ◽  
Yuan-Chih Tsai ◽  
Jhih-Jyun You ◽  
Chun-Lin Cheng ◽  
...  
Keyword(s):  
Water Quality ◽  
Electrical Conductivity ◽  
Wireless Communication ◽  
Monitoring System ◽  
Industrial Waste ◽  
Continuous Monitoring ◽  
Copper Ion ◽  
Water Quality Monitoring ◽  
Ion Concentration ◽  
Quality Monitoring

Recently, environmental pollution resulting from industrial waste has been emerging in an endless stream. The industrial waste contains chemical materials, heavy metal ions, and other toxic materials. Once the industrial waste is discharged without standards, it might lead to water or environmental pollution. Hence, it has become more important to provide evidence-based water quality monitoring. The use of a multifunctional miniaturized water quality monitoring system (WQMS), that contains continuous monitoring, water quality monitoring, and wireless communication applications, simultaneously, is infrequent. Thus, electrodes integrated with polydimethylsiloxane flow channels were presented in this study to be a compound sensor, and the sensor can be adopted concurrently to measure temperature, pH, electrical conductivity, and copper ion concentration, whose sensitivities are determined as 0.0193 °C/mV, −0.0642 pH/mV, 1.1008 mS/V·cm (from 0 mS/cm to 2 mS/cm) and 1.1975 mS/V·cm (from 2 mS/cm to 5.07 mS/cm), and 0.0111 ppm/mV, respectively. A LoRa shield connected into the system could provide support as a node of long range wide area network (LoRaWAN) for wireless communication application. As mentioned above, the sensors, LoRa, and circuit have been integrated in this study to a continuous monitoring system, WQMS. The advantages of the multifunctional miniaturized WQMS are low cost, small size, easy maintenance, continuous sampling and long-term monitoring for many days. Every tested period is 180 min, and the measured rate is 5 times per 20 min. The feedback signals of the miniaturized WQMS and measured values of the instrument were obtained to compare the difference. In the measured results at three different place-to-place locations the errors of electrical conductivity are 0.051 mS/cm, 0.106 mS/cm, and 0.092 mS/cm, respectively. The errors of pH are 0.68, 0.87, and 0.56, respectively. The errors of temperature are 0.311 °C, 0.252 °C, and 0.304 °C, respectively. The errors of copper ion concentration are 0.051 ppm, 0.058 ppm, 0.050 ppm, respectively.

Hydroxyapatite modified with silica used for sorption of copper(II)

2009 ◽  
Vol 63 (5) ◽  
Author(s):  
Erzsébet-Sára Bogya ◽  
Réka Barabás ◽  
Alexandra Csavdári ◽  
Valentina Dejeu ◽  
Ioan Bâldea
Keyword(s):  
Copper Ions ◽  
Copper Ion ◽  
Reaction Medium ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Silica Content ◽  
Ion Concentration ◽  
X Ray Diffraction ◽  
Structural Modifications ◽  
Preparation Phase

AbstractThis paper aims to increase the sorption capacity of hydroxyapatite and to find the best apatite-based material for metal ions sorption. The sorption process of copper ions from water solutions by HAP and structurally modified HAP was carried out in this work. Structural modifications of HAP were realized in the preparation phase by an addition of sodium silica into the reaction medium. The prepared materials were characterized by physical-chemical methods: IR, electron-microscopy and X-ray diffraction. The composites characterized were tested in kinetic studies regarding ion exchange and adsorption of Cu2+. It was revealed that the silica content, particle size and initial copper ion concentration influence the process rate.

Optimization and Characteristics of Copper Pickling Wastewater Treatment in a Single Reactor Using Bio-Electrode Process

2012 ◽  
Vol 446-449 ◽  
pp. 2800-2808
Author(s):  
Guo Jing Yang ◽  
Shuang Shuang Chen ◽  
Wei Hong Wu ◽  
Jian Zhou
Keyword(s):  
Hydraulic Retention Time ◽  
Nitrate Nitrogen ◽  
Ph Value ◽  
Removal Rate ◽  
Copper Ion ◽  
Ion Concentration ◽  
Effluent Water ◽  
Ion Removal ◽  
Secondary Pollution ◽  
Denitrifying Microorganisms

The process optimization and characteristics of electrode-biofilm for the treatment of copper pickling wastewater in the self-designed reactor were experimentally investigated. Carbon electrodes were installed in the reactor as the anode and cathode and denitrifying microorganisms were fixed on the surface of the cathode. The results showed that neutralization, copper ion removal, denitrification proceeded simultaneously and no secondary pollution existed. The removal rate of total nitrogen and copper ion in the effluent water reached 98% and 97% at 30mg/L of copper ion concentration and 100mg/L of nitrate nitrogen when the conditions were controlled at temperature 35°C, current density 0.1mA/cm2, hydraulic retention time 11h and C/N ration 1.07. The pH value of the treated water was increased almost to neutral. In addition, copper ion solution of certain concentration and purity could be made by exchanging the polarity of anode and cathode to recycle copper in this research.

scholarly journals Use of cement kiln dust to remove copper from simulated wastewater using the Response surface methodology

2020 ◽  
Vol 13 (3) ◽  
pp. 200-206
Author(s):  
Hanan A. Ibraheem ◽  
Husham M.Al. Tameemi
Keyword(s):  
Response Surface Methodology ◽  
Contact Time ◽  
Copper Ion ◽  
Operating Conditions ◽  
Ion Concentration ◽  
Copper Removal ◽  
Cement Kiln Dust ◽  
Cement Kiln ◽  
Simulated Wastewater ◽  
Kiln Dust

Copper removal from simulated wastewater was achieved using Cement Kiln Dust (CKD) as adsorbent. The effects of contact time, pH, initial copper ion concentration, rotational speed, and Cement Kiln Dust (CKD) amount were studied. The best operating conditions were determined by applying a Response Surface Methodology (RSM). The results showed that the copper concentration has the main effect on the efficiency of copper removal followed by time, shaking rate, dosage of cement kiln dust, and pH. The best operating conditions were found to have a pH value of 8, contact time 90 minutes, shaking rate of 300 rpm, copper ion concentration 20 ppm, and a quantity of CKD equivalent to 35 g / l. Based on this optimum condition, 99 % of the efficiency of copper removal was achieved.

scholarly journals Effect of Copper Ion Sterilization on Bacterial Community in a Freshwater Recirculating Aquaculture System

2022 ◽  
Vol 79 (2) ◽  
Author(s):  
Jianjun Shan ◽  
Xiaoqing Tian ◽  
Chongwu Guan ◽  
Chenglin Zhang ◽  
Yulei Zhang ◽  
...  
Keyword(s):  
Bacterial Community ◽  
Bacterial Species ◽  
Copper Ion ◽  
Ammonia Nitrogen ◽  
Ion Concentration ◽  
Rrna Gene ◽  
Brachydanio Rerio ◽  
Illumina Hiseq ◽  
Recirculating Aquaculture ◽  
Recirculating Aquaculture Systems

AbstractThe study aimed to evaluate the safety of copper ion sterilization based on copper ion residues in zebrafish (Brachydanio rerio), as well as bacterial community structure and diversity in recirculating aquaculture systems (RASs). The copper ion content was determined using national food safety standard GB 5009.13-2017. Bacterial community structures and alpha and beta diversity indexes were examined using the 16S rRNA gene sequences produced by Illumina HiSeq sequencing. The results revealed no significant copper ion enrichment in B. rerio when the copper ion concentration was 0.15 mg/L. The relative abundances of Erythrobacter, nitrite bacteria, and Flavanobacteria were clearly higher in the treatment group than in the control and differences in bacterial species richness and diversity were obvious. In addition, there was no sharp decrease in the microflora at the outflow of the copper ion generator. In conjunction with the changes in ammonia nitrogen, nitrate, and nitrite concentrations during the experiment, the results indicated that there were no significant effects on the purification efficacy of the biological filter, but the abundances of beneficial bacteria increased significantly. This is of great relevance in order to understand the response of bacterial communities affected by changing environmental conditions, such as copper ion sterilization.

Experimental Research of Spouted Particulate Electrodes on Removal of Copper Wastewater

2013 ◽  
Vol 864-867 ◽  
pp. 1458-1461
Author(s):  
Xin Yang Xu ◽  
Bing Zhao ◽  
Xi Chen ◽  
Hong Lin
Keyword(s):  
Concentration Polarization ◽  
Copper Ion ◽  
Sulfate Solution ◽  
Ion Concentration ◽  
Constant Current ◽  
Electrochemical Polarization ◽  
Optimum Conditions ◽  
Simulated Wastewater ◽  
Recycle Metal ◽  
Metal Back

In this research, heavy metal copper was chosen for this study, with its sulfate solution simulated wastewater, using spouted particulate electrodes to purify wastewater and recycle metal copper. Experimental studied the effects on different conditions of electrodeposition, such as pH, constant current, copper ion concentration, the size of the cathode particle and nitrogen sparging. The results showed the optimum conditions were that pH was 3.0, constant current was 10.0A, the size of cathode particle was 1.8mm and with nitrogen sparging. In particular, nitrogen sparging not only reduced dissolved oxygen in wastewater to prevent the metal back to solution, but also handled the problem of low current efficiency due to concentration polarization and electrochemical polarization.

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