Temat: nanosensor - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Fabrication of electrochemical nanoelectrode for sensor application Rusing focused ion beam technology
Autorzy:: Łaszcz, A.
Nogala, W.
Czerwinski, A.
Ratajczak, J.
Kątcki, J.
Powiązania:: https://bibliotekanauki.pl/articles/778764.pdf
Data publikacji:: 2014
Wydawca:: Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:: FIB nanotechnology
nanosensor
electrochemistry
Opis:: The capabilities and applications of the focused ion beam (FIB) technology for detection of an electrochemical signal in nanoscale area are shown. The FIB system, enabling continuous micro- and nanofabrication within only one equipment unit, was used to produce a prototype of electrochemical nanometer-sized electrode for sensor application. Voltammetric study of electrochemically active compound (ferrocenemethanol) revealed the diffusion limiting current (12 pA), corresponding to a disc (planar) nanoelectrode with about 70 nm diameter of contact area. This size is in a good accordance with the designed contact-area (50 nm × 100 nm for width × thickness) of the FIB-produced nanoelectrode. It confi rms that produced nanoelectrode is working properly in liquid solution and may enable correct measurements in nanometer-sized regions.
Źródło:: Polish Journal of Chemical Technology; 2014, 16, 3; 40-44
1509-8117
1899-4741
Pojawia się w:: Polish Journal of Chemical Technology
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Metal nanoparticles in nanosensors for food qualityassurance
Nanocząstki metali w nanosensorach zapewniających jakość żywności
Autorzy:: Dobrucka, Renata
Powiązania:: https://bibliotekanauki.pl/articles/362214.pdf
Data publikacji:: 2020
Wydawca:: Wyższa Szkoła Logistyki
Tematy:: nanotechnology
nanosensor
safety food
nanotechnologia
bezpieczeństwo żywności
Opis:: Background: Nanotechnology is applied in the food industry to ensure food safety, and it is used both in the processing of food and detection of contaminants. The assurance of quality and safety of food has become an important issue for authorities and food supply chain actors. In order to protect consumers from contamination, adulteration and spoilage, it is absolutely necessary to conduct analyses of food, as it is exposed to numerous chemical substances, which may be harmful to human beings and the environment. Methods: This work presents an overview of the literature concerning nanosensors with metal nanoparticles, which are used to detect the presence of chemical contaminants, pathogens and toxins, as well as to monitor food quality status. Such solutions will undoubtedly contribute to maintaining the safety and quality of food. Results and conclusion: At present, food supply chains are becoming more complex, environmental constraints are becoming stricter, and consumers are changing the way in which they select and consume food, and all those factors inspire modern societies to be more concerned about the harmful substances that could be present in food products. Application of nanoparticles in the food production industry are farreaching and more research in this space is warranted. As developments in the research and development of nanotechnologies continue, so will the opportunities for the food industry to benefit from nanoscience.
Wstęp: Nanotechnologia jest stosowana w przemyśle spożywczym w celu zapewnienia bezpieczeństwa żywności i jest wykorzystywana zarówno w przetwórstwie żywności, jak i wykrywaniu zanieczyszczeń. Zapewnienie jakości i bezpieczeństwa żywności jest ważną kwestią w łańcuchu dostaw żywności. Aby chronić konsumentów przed skażeniem, zafałszowaniem i psuciem, absolutnie konieczne jest przeprowadzenie oceny jakości żywności, ze względu na narażenie na substancje, które mogą być szkodliwe dla ludzi i środowiska. Metody: W pracy przedstawiono przegląd literatury dotyczącej nanosensorów zawierających nanocząstki metali, które służą do wykrywania obecności zanieczyszczeń chemicznych, patogenów i toksyn, a także do monitorowania stanu jakości żywności. Takie rozwiązania niewątpliwie przyczynią się do utrzymania bezpieczeństwa i jakości żywności. Wyniki i podsumowanie: Obecnie łańcuchy dostaw żywności stają się coraz bardziej złożone, ograniczenia środowiskowe stają się coraz surowsze, a konsumenci zmieniają sposób, w jaki wybierają i spożywają żywność. Wszystkie te czynniki powodują zainteresowanie i coraz większą dbałość o jakość i bezpieczeństwo żywności. Zastosowanie nanocząstek w przemyśle spożywczym daje szerokie perspektywy, w związku z tym uzasadnione są dalsze badania w tym obszarze. Wraz z rozwojem badań i rozwoju nanotechnologii będą również rosnąć możliwości, jakie przemysł spożywczy może czerpać z nanonauki.
Źródło:: LogForum; 2020, 16, 2; 271-278
1734-459X
Pojawia się w:: LogForum
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Dynamics of nitric oxide release in the cardiovascular system.
Autorzy:: Balbatun, Aleh
Louka, Febee
Malinski, Tadeusz
Powiązania:: https://bibliotekanauki.pl/articles/1043648.pdf
Data publikacji:: 2003
Wydawca:: Polskie Towarzystwo Biochemiczne
Tematy:: cholesterolemia
heart
porphyrinic nanosensor
hypertension
dysfunctional endothelium
Opis:: The endothelium plays a critical role in maintaining vascular tone by releasing nitric oxide (NO). Endothelium derived NO diffuses to smooth muscles, triggering their relaxation. The dynamic of NO production is a determining factor in signal transduction. The present studies were designed to elucidate dynamics of NO release from normal and dysfunctional endothelium. The nanosensors (diameter 100-300 nm) exhibiting a response time better than 100 μs and detection limit of 1.0×10-9 mol L-1 were used for in vitro monitoring of NO release from single endothelial cells from the iliac artery of normotensive (WKY) rats, hypertensive (SHR) rats, and normal and cholesterolemic rabbits. Also, the dynamics and distribution of NO in left ventricular wall of rabbit heart were measured. The rate of NO release was much higher (1200 ± 50 nmol L-1 s-1) for WKY than for SHR (460 ± 10 nmol L-1 s-1). Also, the peak NO concentration was about three times higher for WKY than SHR. Similar decrease in the dynamics of NO release was observed for cholesterolemic rabbits. The dynamics of NO release changed dramatically along the wall of rabbit aorta, being highest (0.86 ± 0.12 μmol L-1) for the ascending aorta, and lowest for the iliac aorta (0.48 ± 0.15 μmol L-1). The distribution of NO in the left ventricular wall of rabbit heart was not uniform and varied from 1.23 ± 0.20 μmol L-1 (center) to 0.90 ± 0.15 μmol L-1 (apex). Both, the maximal concentration and the dynamics of NO release can be useful diagnostic tools in estimating the level of endothelial dysfunction and cardiovascular system efficiency.
Źródło:: Acta Biochimica Polonica; 2003, 50, 1; 61-68
0001-527X
Pojawia się w:: Acta Biochimica Polonica
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: A review of the current state-of-the-art in Fano resonance-based plasmonic metal-insulator-metal waveguides for sensing applications
Autorzy:: Adhikari, R.
Chauhan, D.
Mola, G. T.
Dwivedi, R. P.
Powiązania:: https://bibliotekanauki.pl/articles/2063886.pdf
Data publikacji:: 2021
Wydawca:: Polska Akademia Nauk. Stowarzyszenie Elektryków Polskich
Tematy:: coupled resonator
Fano resonance
finite element method
plasmonic nanosensor
sensitivity
waveguide
Opis:: Fano resonance is an optical effect that emerges from the coherent coupling and interference (constructive and destructive) between the continuous state (background process) and the Lorentzian state (resonant process) in the plasmonic waveguide-resonator system. This effect has been used in the applications like optical sensors. These sensors are extensively used in sensing biochemicals and gases by the measurement of refractive index changes as they offer high sensitivity and ultra-high figure of merit. Herein, we surveyed several plasmonic Fano sensors with different geometries composed of metal-insulator-metal waveguide(s). First, the resonators are categorized based on different architectures. The materials and methods adopted for these designs are precisely surveyed and presented. The performances are compared depending upon the characterization parameters like sensitivity and figure of merit. Finally, based on the survey of very recent models, the advances and challenges of refractive index sensing deployed on Fano resonances are discussed.
Źródło:: Opto-Electronics Review; 2021, 29, 4; 148--166
1230-3402
Pojawia się w:: Opto-Electronics Review
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dopant-Based Charge Sensing Utilizing P-I-N Nanojunction
Autorzy:: Nowak, R.
Jabłoński, R.
Powiązania:: https://bibliotekanauki.pl/articles/220915.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: nanosensor
silicon
p-i-n junction
dopant
Kelvin Probe Force Microscope
Opis:: We studied lateral silicon p-i-n junctions, doped with phosphorus and boron, regarding charge sensing feasibility. In order to examine the detection capabilities and underlying mechanism, we used in a complementary way two measurement techniques. First, we employed a semiconductor parameter analyzer to measure I−V characteristics at a low temperature, for reverse and forward bias conditions. In both regimes, we systematically detected Random Telegraph Signal. Secondly, using a Low Temperature Kelvin Probe Force Microscope, we measured surface electronic potentials. Both p-i-n junction interfaces, p-i and i-n, were observed as regions of a dynamic behaviour, with characteristic time-dependent electronic potential fluctuations. Those fluctuations are due to single charge capture/emission events. We found analytically that the obtained data could be explained by a model of two-dimensional p-n junction and phosphorus-boron interaction at the edge of depletion region. The results of complementary measurements and analysis presented in this research, supported also by the previous reports, provide fundamental insight into the charge sensing mechanism utilizing emergence of individual dopants.
Źródło:: Metrology and Measurement Systems; 2017, 24, 2; 391-399
0860-8229
Pojawia się w:: Metrology and Measurement Systems
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Soymida febrifuga aqueous root extract maneuvered silver nanoparticles as mercury nanosensor and potential microbicide
Autorzy:: Sowmyya, T.
Lakshmi, G. Vijaya
Powiązania:: https://bibliotekanauki.pl/articles/1158479.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Characterization
Green synthesis
Mercury nanosensor
Microbicide
Silver nanoparticles
Soymida febrifuga
Opis:: The present communication reports a rapid, uncomplicated, sustainable and facile method of eco-friendly synthesis of silver nanoparticles (AgNPs). The pressing need for the development of benign, profitable and eco-friendly alternative routes has inspired researchers to explore plant extracts as safer replacements to hazardous chemicals. In the present study, a benign method of synthesis of AgNPs using Soymida febrifuga aqueous root extract has been developed. The characterization studies of synthesized AgNPs revealed spherical morphology and crystalline nature of AgNPs. The average particle size was 21.81 nm. The synthesized AgNPs were employed as mercury nanosensor for the selective and sensitive detection of toxic mercury ions in water and soil samples. The AgNPs showed a marked visual color change and change in surface plasmon resonance band on interaction with mercury ions. The greater selectivity of AgNPs towards mercury ions was observed. The limit of detection of mercury by 100 μL of colloidal AgNPs was found to be 2×10-4 M visually and 1.332×10-5 M spectrophotometrically in water samples and ×-4 M visually and 22.3×10-5 M spectrophotometrically in soil samples. The method makes use of a small quantity of AgNPs for detection of mercury in water and soil samples. The method proposed in the present study provides a rapid, selective and sensitive method for detection of mercury ions in environmental water and soil samples. The synthesized AgNPs were also used as effective microbicidal agents. The microbicidal potential of the synthesized AgNPs was checked against two gram positive and gram negative bacterial strains.
Źródło:: World Scientific News; 2018, 114; 84-105
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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