scholarly journals A Sensitive Pyrimethanil Sensor Based on Electrospun TiC/C Film

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1531 ◽  
Author(s):  
Ling Sui ◽  
Tingting Wu ◽  
Lijuan Liu ◽  
Honghong Wang ◽  
Qingqing Wang ◽  
...  
Keyword(s):  
Noble Metals ◽  
Electrode Materials ◽  
Transition Metal Carbide ◽  
Metal Carbide ◽  
Long Term Stability ◽  
Adsorption Processes ◽  
Tic Nanoparticles ◽  
Sensing Performance ◽  
Excellent Stability

Titanium carbide (TiC) is a very significant transition metal carbide that displays excellent stability and electrical conductivity. The electrocatalytic activity of TiC is similar to noble metals but is much less expensive. Herein, carbon nanofibers (CNFs)-supported TiC nanoparticles (NPs) film (TiC/C) is prepared by electrospinning and carbothermal processes. Well-dispersed TiC NPs are embedded tightly into the CNFs frameworks. The electrochemical oxidation of pyrimethanil (PMT) at the TiC/C-modified electrode displays enhanced redox properties, and the electrode surface is controlled simultaneously both by diffusion and adsorption processes. When TiC/C is applied for PMT determination, the as-fabricated sensor shows good sensing performance, displaying a wide linear range (0.1–600 μM, R2 = 0.998), low detection limit (33 nM, S/N = 3), and good reproducibility with satisfied anti-interference ability. In addition, TiC/C shows long-term stability and good application in natural samples. The facile synthetic method with good sensing performance makes TiC/C promising as novel electrode materials to fabricate efficient sensors.

scholarly journals Preservation of rutin nanosuspensions without the use of preservatives

2019 ◽  
Vol 10 ◽  
pp. 1902-1913 ◽  
Author(s):  
Pascal L Stahr ◽  
Cornelia M Keck
Keyword(s):  
Microbial Contamination ◽  
Good Alternative ◽  
Freeze Thaw ◽  
Long Term Stability ◽  
Universal Approach ◽  
Poorly Soluble ◽  
Microbial Stability ◽  
Preservative Free ◽  
Excellent Stability

Nanocrystals are used as universal approach to improve the bioactivity of poorly soluble active ingredients. They are produced by various techniques, typically yielding aqueous nanosuspensions, which are prone to microbial contamination. Preservation of nanocrystals is possible but might not always be feasible, as preservatives might interfere with other excipients in the formulations or with chemicals used in assays, cell cultures or animal models. Therefore, to enable an easier use of nanocrystals, preservative-free nanosuspensions would be a good alternative. In this study, rutin nanocrystals were frozen and stored for three months at −20 °C. The chemical, physical and microbial stability were monitored, and the results were compared to preserved nanosuspensions. The frozen nanosuspensions remained stable and possessed excellent stability over the whole time of storage, indicating that the freeze–thaw process is suitable for the production of preservative-free nanosuspensions with excellent long-term stability. The freeze–thaw process for nanosuspensions is a simple concept and is suggested as alternative, when preserved nanosuspensions cannot be used.

scholarly journals Microstructured capacitive sensor with broad detection range and long-term stability for human activity detection

2021 ◽  
Vol 5 (1) ◽  
Author(s):  
Xin He ◽  
Zhihao Liu ◽  
Gengzhe Shen ◽  
Xiang He ◽  
Jionghong Liang ◽  
...  
Keyword(s):  
Pressure Sensor ◽  
Dielectric Layer ◽  
Electrode Materials ◽  
Silver Nanowires ◽  
Wearable Electronics ◽  
Composite Electrodes ◽  
Detection Range ◽  
Term Stability ◽  
Long Term Stability

AbstractIn recent years, flexible stress sensors capable of monitoring diverse body movements and physiological signals have been attracting great attention in the fields of healthcare systems, human–machine interfaces, and wearable electronics. Inspired by the structure of natural eggshell inner membrane (ESIM), we developed a pressure sensor based on MXene (Ti3C2Tx)/Ag NWs (silver nanowires) composite electrodes and the micro-structured dielectric layer to meet the application requirements of wide detection range and long-term stability for the sensors. In the light of the nanoscale-microarray of the dielectric layer and the rough surface of electrode materials, this pressure sensor is expected to allow great and persistent deformation during the loading process. As a result, the device is characterized by an improved sensitivity, fast response (in the millisecond range), wide detection range (0–600 kPa), and long-term stability. The outstanding performance of the proposed sensor makes it possible to detect various human activities, such as speaking, air blowing, clenching, walking, finger/knee/elbow bending, and striking, demonstrating its good application prospects in wearable and flexible electronic devices.

scholarly journals Multi-Odor Discrimination by Rat Sniffing for Potential Monitoring of Lung Cancer and Diabetes

Sensors ◽  
2021 ◽  
Vol 21 (11) ◽  
pp. 3696
Author(s):  
Yunkwang Oh ◽  
Ohseok Kwon ◽  
Sun-Seek Min ◽  
Yong-Beom Shin ◽  
Min-Kyu Oh ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Cost Effective ◽  
Performance Criterion ◽  
Odor Discrimination ◽  
Long Term Stability ◽  
Quantitative Measurements ◽  
Behavior Response ◽  
Odor Monitoring ◽  
Sensing Performance

The discrimination learning of multiple odors, in which multi-odor can be associated with different responses, is important for responding quickly and accurately to changes in the external environment. However, very few studies have been done on multi-odor discrimination by animal sniffing. Herein, we report a novel multi-odor discrimination system by detection rats based on the combination of 2-Choice and Go/No-Go (GNG) tasks into a single paradigm, in which the Go response of GNG was replaced by 2-Choice, for detection of toluene and acetone, which are odor indicators of lung cancer and diabetes, respectively. Three of six trained rats reached performance criterion, in 12 consecutive successful tests within a given set or over 12 sets with a success rate of over 90%. Through a total of 1300 tests, the trained animals (N = 3) showed multi-odor sensing performance with 88% accuracy, 87% sensitivity and 90% specificity. In addition, a dependence of behavior response time on odor concentrations under given concentration conditions was observed, suggesting that the system could be used for quantitative measurements. Furthermore, the animals’ multi-odor sensing performance has lasted for 45 days, indicating long-term stability of the learned multi-odor discrimination. These findings demonstrate that multi-odor discrimination can be achieved by rat sniffing, potentially providing insight into the rapid, accurate and cost-effective multi-odor monitoring in the lung cancer and diabetes.

scholarly journals Thermal Treatment of Aerosol Deposited NiMn2O4 NTC Thermistors for Improved Aging Stability

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3982 ◽  
Author(s):  
Michaela Schubert ◽  
Christian Münch ◽  
Sophie Schuurman ◽  
Véronique Poulain ◽  
Jaroslaw Kita ◽  
...  
Keyword(s):  
Thermal Treatment ◽  
Electrode Materials ◽  
Silicone Oil ◽  
Negative Temperature ◽  
Aerosol Deposition ◽  
Short Term ◽  
Long Term Stability ◽  
High Temperature Xrd ◽  
Ntc Thermistor

This paper examines the influence of a short-term thermal treatment of aerosol deposited negative temperature coefficient (NTC) thermistor films on the NTCR characteristics and their long-term stability with different electrode materials. An aerosol deposition of a spinel-based NiMn2O4 powder on alumina substrates with screen-printed AgPd and Au interdigital electrode structures was performed. The manufactured components of the typical size of 1206 were tempered in a moderate temperature range of 200 °C to 800 °C and aged for 1000 h at 125 °C in air. Based on R-T measurements in a high-precision silicone oil thermostat bath and high temperature XRD analyses, the influence of the thermal treatment was analyzed and discussed. A 60-min tempering at 400 °C proved to be optimal, as both the NTCR parameters and their ageing stability could be significantly improved. The findings are explained.

Water bamboo-derived porous carbons as electrode materials for supercapacitors

2015 ◽  
Vol 39 (5) ◽  
pp. 3859-3864 ◽  
Author(s):  
Jiangfeng Li ◽  
Qingsheng Wu
Keyword(s):  
Activated Carbon ◽  
Electrode Materials ◽  
Carbon Materials ◽  
Porous Carbons ◽  
Rectangular Shape ◽  
Scan Rate ◽  
Excellent Stability

Water bamboo-derived activated carbon materials were synthesized through the activation of KOH. These materials show a rectangular shape at the scan rate of 50 mV s−1. The activated carbon synthesized at a 2 : 1 ratio of KOH shows the most excellent stability in the long-term cycles.

Design and Verification of a Sensing Device for Deformation Measurement of High Temperature Pipes

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
J. H. Jia ◽  
X. Y. Hu ◽  
Z. L. An ◽  
F. Z. Xuan ◽  
S. T. Tu
Keyword(s):  
Numerical Simulation ◽  
High Temperature ◽  
Power Plants ◽  
Design Procedure ◽  
Term Stability ◽  
Long Term Stability ◽  
Pipe Model ◽  
Working Principle ◽  
Excellent Stability

In this paper, a sensing device specifically for measuring deformations of high temperature pipes is designed, and its applicability is verified both experimentally and theoretically. First, the design procedure and the working principle of the sensing device are described in detail. Then, experiments are carried out to prove the accuracy and the long-term stability of the sensing device. To verify the accuracy of the device, numerical simulation of the deformation of a pipe model is carried out using finite element method. Results from the experimental measurements are in good agreement with results from the numerical simulation. The long-term stability of the device is validated by monitoring the deformation. Conclusions are drawn that the designed sensing device has high accuracy and excellent stability and can be used for measuring deformations of high temperature pipes in power plants.

A thermally robust and strongly oxidizing surface of WO3 hydrate nanowires for electrical aldehyde sensing with long-term stability

2021 ◽  
Author(s):  
Guozhu Zhang ◽  
Takuro Hosomi ◽  
Wataru Mizukami ◽  
Jiangyang Liu ◽  
Kazuki Nagashima ◽  
...  
Keyword(s):  
Acid Treatment ◽  
Strong Acid ◽  
Term Stability ◽  
Long Term Stability ◽  
Sensing Performance

Thermally robust and strongly oxidizing surface is created by a simple strong acid treatment on WO3 hydrate nanowires, which enables integrated nanosensors to operate with a superior sensing performance to aldehyde molecules with long-term stability.

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