scholarly journals Highly Sensitive and Selective H2S Chemical Sensor Based on ZnO Nanomaterial

2019 ◽  
Vol 9 (6) ◽  
pp. 1167 ◽  
Author(s):  
Vardan Galstyan ◽  
Nicola Poli ◽  
Elisabetta Comini
Keyword(s):  
Chemical Sensor ◽  
Gas Sensing ◽  
Chemical Properties ◽  
Device Fabrication ◽  
Sensing Systems ◽  
Highly Sensitive ◽  
Prepared Material ◽  
Significant Step ◽  
Reducing Gases ◽  
Physical And Chemical

ZnO is worth evaluating for chemical sensing due to its outstanding physical and chemical properties. We report the fabrication and study of the gas sensing properties of ZnO nanomaterial for the detection of hydrogen sulfide (H2S). This prepared material exhibited a 7400 gas sensing response when exposed to 30 ppm of H2S in air. In addition, the structure showed a high selectivity towards H2S against other reducing gases. The high sensing performance of the structure was attributed to its nanoscale size, morphology and the disparity in the sensing mechanism between the H2S and other reducing gases. We suggest that the work reported here including the simplicity of device fabrication is a significant step toward the application of ZnO nanomaterials in chemical gas sensing systems for the real-time detection of H2S.

scholarly journals Bimetallic Nanocrystals: Structure, Controllable Synthesis and Applications in Catalysis, Energy and Sensing

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1926
Author(s):  
Gaojie Li ◽  
Wenshuang Zhang ◽  
Na Luo ◽  
Zhenggang Xue ◽  
Qingmin Hu ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Chemical Properties ◽  
Research Progress ◽  
Synthesis Methods ◽  
Controlled Synthesis ◽  
Controllable Synthesis ◽  
Composition And Structure ◽  
Bimetallic Nanocrystals ◽  
Physical And Chemical ◽  
And Chemical Properties

In recent years, bimetallic nanocrystals have attracted great interest from many researchers. Bimetallic nanocrystals are expected to exhibit improved physical and chemical properties due to the synergistic effect between the two metals, not just a combination of two monometallic properties. More importantly, the properties of bimetallic nanocrystals are significantly affected by their morphology, structure, and atomic arrangement. Reasonable regulation of these parameters of nanocrystals can effectively control their properties and enhance their practicality in a given application. This review summarizes some recent research progress in the controlled synthesis of shape, composition and structure, as well as some important applications of bimetallic nanocrystals. We first give a brief introduction to the development of bimetals, followed by the architectural diversity of bimetallic nanocrystals. The most commonly used and typical synthesis methods are also summarized, and the possible morphologies under different conditions are also discussed. Finally, we discuss the composition-dependent and shape-dependent properties of bimetals in terms of highlighting applications such as catalysis, energy conversion, gas sensing and bio-detection applications.

scholarly journals Synthesis of highly sensitive disordered porous SnO2 aerogel composite material by the chemical deposition method: synergistic effect of a layer of CuO thin film

RSC Advances ◽  
2017 ◽  
Vol 7 (62) ◽  
pp. 39334-39340 ◽  
Author(s):  
Tian-tian Li ◽  
Ren-rong Zheng ◽  
Hui Yu ◽  
Ying Yang ◽  
Ting-ting Wang ◽  
...  
Keyword(s):  
Thin Film ◽  
Composite Material ◽  
Synergistic Effect ◽  
Gas Sensing ◽  
Chemical Deposition ◽  
Deposition Method ◽  
Highly Sensitive ◽  
Aerogel Composite ◽  
Prepared Material ◽  
Chemical Deposition Method

In this study, a new chemical deposition method was innovatively used to prepare disordered porous CuO/SnO2 aerogel composite material (CuO/SnO2-ACM). The prepared material has the excellent gas sensing property.

Microwell Geometry Modulates Interleukin-6 Secretion in Human Mesenchymal Stem Cells

MRS Advances ◽  
2017 ◽  
Vol 2 (47) ◽  
pp. 2561-2570
Author(s):  
Xun Xu ◽  
Weiwei Wang ◽  
Zhengdong Li ◽  
Karl Kratz ◽  
Nan Ma ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Interleukin 6 ◽  
Therapeutic Potential ◽  
Chemical Properties ◽  
Human Mesenchymal Stem Cells ◽  
Secretion Profile ◽  
Highly Sensitive ◽  
Physical And Chemical ◽  
Cell Culture Substrate

ABSTRACTThe therapeutic effect of mesenchymal stem cells (MSCs) has been investigated in various clinical applications, in which their functional benefits are mainly attributed to the secretion of soluble factors. The enhancement of their therapeutic potential by physical and chemical properties of cell culture substrate is a safe and effective strategy, since they are highly sensitive to their microenvironment such as the elasticity and surface topography. In this study, we demonstrated that the geometry of polymeric substrate regulated the interleukin-6 (IL-6) secretion of human adipose derived MSCs. Polystyrene substrates comprising arrays of square-shaped (S50) or round-shaped (R50) microwells (side length or diameter of 50 μm and depth of 10 μm) were prepared by injection molding. Cellular apoptototic rate of MSCs was not affected by the microwell geometry, while the upregulated secretion of IL-6 and the enhancement of nuclear transcription factor STAT3 were detected in MSCs seeded on S50 substrate. The geometry-dependent modulatory effect was highly associated with ROCK signaling cascade. The inhibition of ROCK abolished the disparity in IL-6 secretion. These findings highlight the possibility to steer the secretion profile of stem cells via microwell geometry in combination with the manipulation of ROCK signaling pathway.

scholarly journals Facile Synthesis of Polypyrrole-Functionalized CoFe2O4@SiO2 for Removal for Hg(II)

Nanomaterials ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 455 ◽  
Author(s):  
Yuhao Zhao ◽  
Kai Xia ◽  
Zhenzong Zhang ◽  
Ziming Zhu ◽  
Yongfu Guo ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Regeneration Ability ◽  
Order Kinetic ◽  
Synthesis Time ◽  
Operational Conditions ◽  
Prepared Material ◽  
Pseudo Second Order ◽  
Isotherms And Thermodynamics ◽  
Physical And Chemical ◽  
And Chemical Properties

In order to avoid using toxic or harmful operational conditions, shorten synthesis time, enhance adsorption capacity, and reduce operational cost, a novel magnetic nano-adsorbent of CoFe2O4@SiO2 with core–shell structure was successfully functionalized with polypyrrole (Ppy). The physical and chemical properties of CoFe2O4@SiO2-Ppy are examined by various means. The as-prepared CoFe2O4@SiO2-Ppy nanomaterial was used to adsorb Hg2+ from water. During the process, some key effect factors were studied. The adsorption process of Hg2+ onto CoFe2O4@SiO2-Ppy was consistent with the pseudo-second-order kinetic and Langmuir models. The Langmuir capacity reached 680.2 mg/g, exceeding those of many adsorbents. The as-prepared material had excellent regeneration ability, dispersibility, and stability. The fitting of kinetics, isotherms, and thermodynamics indicated the removal was endothermic and spontaneous, and involved some chemical reactions. The application evaluation of electroplating wastewater also shows that CoFe2O4@SiO2-Ppy is an excellent adsorbent for Hg2+ ions from water.

scholarly journals Novel Nanofluidic Cells Based on Nanowires and Nanotubes for Advanced Chemical and Bio-Sensing Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 90
Author(s):  
Xin-Yi Zhu ◽  
Bo-Ran Wang ◽  
Yi Gu ◽  
Hao Zhu ◽  
Lin Chen ◽  
...  
Keyword(s):  
Single Molecule ◽  
Pathogen Detection ◽  
Gas Sensing ◽  
Chemical Properties ◽  
Synthesis Methods ◽  
Sensing Applications ◽  
Research Activities ◽  
Nanofluidic Devices ◽  
Working Principle ◽  
Physical And Chemical

Since the first introduction of one-dimensional nanochannels for single-molecule detection, there has been increasing interest in modern nanofluidic systems, such as chemical and biological sensing applications. Recently developed nanowires (NWs) and nanotubes (NTs) have received tremendous attention due to their unique geometrical, physical and chemical properties, which are very attractive in this field. Here, we review the recent research activities in the field of novel nanofluidic cells based on NWs and NTs. First, we give a brief introduction of this field. Then the common synthesis methods of NWs and NTs are summarized. After that, we discuss the working principle and sensing mechanism of nanofluidic devices, which is fundamental to the interaction between these nanostructures and small molecules. Finally, we present the NW- and NT-based devices for chemical and bio-sensing applications, such as gas sensing, pathogen detection, DNA sequencing, and so forth.

scholarly journals Synthesis and Ethanol Sensing Properties of Novel Hierarchical Sn3O4Nanoflowers

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Xingyang Li ◽  
Fengping Wang ◽  
Jianhai Tu ◽  
Hidayat Ullah Shah ◽  
Jianling Hu ◽  
...  
Keyword(s):  
Gas Sensing ◽  
Chemical Properties ◽  
Hierarchical Structures ◽  
Hydrothermal Time ◽  
Hydrothermal Route ◽  
One Pot ◽  
Practical Applications ◽  
Lower Temperature ◽  
Ethanol Sensing ◽  
Physical And Chemical

Due to the metastable property and arduous preparation, to control the size and shape of intermediate Sn3O4nanocrystals to tune functional properties still poses great challenge, and the physical and chemical properties are not fully investigated. Here, we report a simple one-pot template-free hydrothermal route to fabricate Sn3O4flower-like hierarchical structures self-assembled by aligned high-density nanoslices. In order to explore the growth mechanism, a series of samples with various hydrothermal time were prepared and examined by FESEM and Raman. Results show that the hydrothermal time influences the phases and morphology of the final products. Particularly, a sensor based on these Sn3O4was implemented to investigate the potential of Sn3O4for the ethanol detection, revealing that this material reacts to ethanol in a linear way with high response yet at lower temperature (190°C) than that of the well-known SnO2. Also, this intermediate tin oxide with rational control over dimension and morphology provides new opportunities for practical applications in gas sensing towards other reducing gases.

scholarly journals Research Progress of Gas Sensing Performance of 2D Hexagonal WO3

2021 ◽  
Vol 9 ◽  
Author(s):  
Yueqi Li ◽  
Qin Zhou ◽  
Shoubing Ding ◽  
Zhimin Wu
Keyword(s):  
Gas Sensing ◽  
Low Cost ◽  
Chemical Properties ◽  
High Sensitivity ◽  
Oxide Semiconductor ◽  
Research Progress ◽  
Research Directions ◽  
Sensor Field ◽  
Sensitivity And Selectivity ◽  
Physical And Chemical

Metal oxide semiconductor gas sensing materials have attracted great research interest in the gas sensor field due to their outstanding physical and chemical properties, low cost, and easy preparation. Among them, two-dimensional hexagonal tungsten trioxide (2D h-WO3) is especially interesting because of its high sensitivity and selectivity to some gases. We firstly introduce the characteristics of 2D h-WO3 gas sensing materials and discuss the effects of microstructure, oxygen vacancy, and doping modification on the gas sensing properties of 2D h-WO3 mainly. Finally, we explore the application of 2D h-WO3 gas sensing materials and propose some research directions.

scholarly journals QUANTITATIVE DETERMINATION OF XANTHONE SUM IN TERMS OF MANGIFERIN IN AERIAN ORGANS OF SPECIES OF GENUS HEDYSARUM L. BY UV SPECTROPHOTOMETRY

2020 ◽  
pp. 179-186
Author(s):  
Dzhavgarat Ruslanovna Imachuyeva ◽  
Fatima Kazbekovna Serebryanaya ◽  
Ifrat Nazimovich Zilfikarov
Keyword(s):  
Quantitative Determination ◽  
Raw Materials ◽  
Chemical Properties ◽  
Raw Material ◽  
Uv Spectrophotometry ◽  
Highly Sensitive ◽  
Material Procurement ◽  
Physical And Chemical ◽  
Study Species

Preparing of the antiviral and antibacterial medicinal plants is a promising task of native pharmacy. In this regard, it is interesting to study species of the genus penny, namely Hedysarum caucasicum M.Bieb., Hedysarum grandiflorum Pall., Hedysarum daghestanicum Rupr. ex. Boiss., the regions of distribution, chemical composition and known pharmacological properties will allow to justify directions of their rational use, as well as creation of new phytopreparations of antiviral action on the basis of medicinal raw materials. During the complex pharmacognostic studies of three species of Hedysarum L. we have developed the method for isolation and quantitative determination of the sum of xanthones in terms of mangiferin by UV spectrophotometry. The technique takes into account the basic physical and chemical properties of xanthones, is characterized by reproducibility, high accuracy, simplicity of implementation, allows to carry out both screening evaluation of various raw objects containing mangiferin derivatives, as well as standardization of the prepared medicinal plant raw material of the penny. The developed methods are tested on the aerian organs of Hedysarum L. species, collected and dried taking into account the rules and requirements of drug raw material procurement. As a result, Hedysarum caucasicum M.Bieb herb (0.624%) was found to be the highest quantitative amount of xanthone sum in terms of mangiferin. The obtained results show the prospect of further research of the aerian part of the Hedysarum caucasicum M.Bieb. as an additional source of mangiferin. The method of quantitative determination of xanthone sum in the list for mangiferin in the above-ground part of Hedysarum caucasicum M.Bieb; Based on the obtained data, it has been found that the proposed technique is highly sensitive, reproducible and usable.

scholarly journals Diagnosis of promicrolithic changes in gallbladder bile by crystallography

2021 ◽  
Vol 1 (5) ◽  
pp. 12-18
Author(s):  
Ya. M. Vahrushev ◽  
N. A. Hochlacheva ◽  
N. N. Glazyrina ◽  
A. M. Farrakhov
Keyword(s):  
Ultrasound Examination ◽  
Gallstone Disease ◽  
Young Patients ◽  
Chemical Properties ◽  
Stage I ◽  
Morphological Pattern ◽  
Aged Patients ◽  
Highly Sensitive ◽  
Physical And Chemical ◽  
And Chemical Properties

The aim of the study. Determining the dependence of the bile microstructure degree of destabilization of bile and on the age of patients with the I (pre-stone) stage of the cholelitiasis.Material and methods. About 396 patients with stage I of cholelitiasis. 1 group consisted of 125 young patients (25–44 years), 2 groups — 164 middle-aged patients (45–59 years), 3 group — 107 elderly patients (60–74 years). In verifi cation of the diagnosis, in addition to anamnestic and general clinical data, the results of ultrasound examination (ultrasound) of the gallbladder, the study of the physical and chemical properties of bile are used. Crystallography was used to study the morphological pattern of the gallbladder.Results. In the evaluation of the bladder bile of patients with stage I gallstone disease, there is a decrease in the angle of the tilt of the liquid crystal lines, as well as the appearance of optically active inclusions, such as branched dendrites with plate branches, matted- fi ber aggregates, shield- shaped units and short- branched dendrites.Conclusion. Crystallography is highly sensitive, but at the same time an easy-to-perform method and can be widely used in early diagnosis of gallstone disease.

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