Готові списки джерел за темами / CdO Nanoparticle

Добірка наукової літератури з теми "CdO Nanoparticle"

Автор: Grafiati
Опубліковано: 7 вересня 2023

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Статті в журналах з теми "CdO Nanoparticle"

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Rajkamal, N., K. Sambathkumar, M. Venkatachalapathy, and V. Latha. "Synthesis, structural, morphological, functional, optical and particle size enhanced cadmium oxide nanoparticles on electro-chemical applications." Digest Journal of Nanomaterials and Biostructures 18, no. 1 (January 2023): 83–92. http://dx.doi.org/10.15251/djnb.2023.181.83.

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The co-precipitation technique of cadmium oxide (CdO) nanoparticles in aqueous solutions at high temperatures was employed in this investigation. The potential for electrochemical activity was studied. Thus, a powder X-ray diffractometer was used to quantitatively evaluate the Scherer-calculated crystallite grain size and dislocation density. Scanning electron microscopy imaging and analysis revealed the distinct shape and structure of CdO nanoparticles. The above-mentioned nanoparticles were sorted into their respective functional groups by FTIR spectroscopy. The CdO nanoparticle size was measured in the nanometre range using a dilution-based particle size analyzer. There was a significant improvement in the CdO nanoparticles' ability to absorb UV-visible light. Their unique colours of light were made visible in the spectrum of their fluorescence emission, which allowed them to be clearly authenticated. An electrochemical probe into the phenomenon of super capacitance has revealed its fundamental characteristics. This CdO nanomaterial might be useful for scientific investigation.
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2

Heidari, Alireza. "Study of Physical Properties of Cadmium Oxide (CdO) and CdO/DNA/RNA Nanostructures Thin Layers Produced by Spray Pyrolysis Technique for Manufacturing Cadmium Oxide (CdO) Nanoparticles and Evaluation of the Effect of DNA/RNA Doping on Their Optical Characteristics." Advanced Science, Engineering and Medicine 12, no. 10 (October 1, 2020): 1224–30. http://dx.doi.org/10.1166/asem.2020.2686.

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In the current research, Cadmium Oxide (CdO) nanoparticles are produced by ultrasonic waves and the effect of nucleic acids (DNA/RNA) doping on their optical and structural characteristics are investigated. X-ray Diffraction (XRD) analysis confirms extension of peaks and formation of Cadmium Oxide (CdO) nanoparticles. Absorption spectra for the produced samples are shown that addition of DNA/RNA affects the spectrum and absorption edge shifts towards blue region which is due to reduction of nanoparticle size and it confirms by SEM images. In addition, SEM images show the formation of approximately single size ellipsoidal nanostructures for pure Cadmium Oxide (CdO). However, the size, form and distribution of nanoparticles are varied after doping. On the other hand, in the current paper, Cadmium Oxide (CdO) and DNA/RNA/Cadmium Oxide (CdO) nanostructures thin layers are produced using spray pyrolysis technique over a glassy substrate. Annealing of CdO thin layer for half an hour in the air leads to improvement of crystalline structure. Optical characteristics and crystalline structure of samples are studied through X-ray Diffraction (XRD) and UV-Visible spectroscopy. The results of the current study were shown that CdO thin layers are of hexagonal structure. Further, optical gaff of CdO/DNA/RNA/glass thin layer is increased compared to CdO/glass layer.
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3

Rasha H. Ahmed, Abdul Majeed E. Ibrahim, and Kadhim A. Aadem. "Effect of laser energy on grain size of cadmium oxide nanoparticles in ethanol by PLD method." Tikrit Journal of Pure Science 23, no. 7 (January 26, 2023): 85–91. http://dx.doi.org/10.25130/tjps.v23i7.701.

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The Pulse laser deposition technique was used in the preparation of nanoparticle solutions (CdO) using Nd:YAG laser and five deposition energies (400, 500, 600, 700 and 800 mJ) with fixed pulses (300 pulse and 6 Hz) was used . (CdO) nanoparticles were deposited on glass substrate at (300C°) to study structure properties and formed thin films of thickness (200 nm). The grain size of cadmium oxide nanoparticles in ethanol have been found to be affected by the laser energy , The results of the AFM tests showed that the higher the deposition energies, the greater the higher the grain size.
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Muhammed, Suaad A. A., and Nada K. Abass. "Biosynthesis and Characterization of CdO: Ag NPs using Moringa Leaves Extract for Use as Anti-microbial Activity." INTERNATIONAL JOURNAL OF DRUG DELIVERY TECHNOLOGY 13, no. 01 (March 25, 2023): 75–80. http://dx.doi.org/10.25258/ijddt.13.1.11.

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The current research focuses on synthesizing cadmium oxide (CdO), CdO: Ag nanoparticle (NPs) by green method using the Moringa leaves Extract (MLE) and its anti-microbial activity. Using UV-vis spectroscopy to determine the formation of CdO: Ag NPs where the energy gap of the prepared samples was 2.79, 2.67, and 2.46 for CdO, CdO: Ag 3% and CdO: Ag 5%, respectively. The biological substances in responsibility of capping the produced NPs were identifi ed using FTIR. The NPs were further characterized by X-ray diff ractograms (XRD). The average grain size for CdO, CdO: Ag (3 and 5%) were 15.322, 15.5, and 36.84 nm, respectively, scanning electron microscope (SEM), energy dispersive X-ray (EDX) and atomic force microscope (AFM), were obtained the average diameter 18.88, 43.48, 99.15 nm for CdO, CdO: Ag 3% and CdO: Ag 5%, respectively. The anti-bacterial activity of green synthesized CdO: Ag(NPS) was investigated against (Staphylococcus aureus, Escherichia coli, and Klebsiella pneumonia) at diff erent concentrations, showing clear inhibition zones from 30 to 38 mm, thereby indicating its inhibitory activity.
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Umar, Ahmad, Ramesh Kumar, Mohinder Singh Chauhan, Rajesh Kumar, Ahmed A. Ibrahim, Mohsen A. M. Alhamami, Hassan Algadi, and Mohammad Shaheer Akhtar. "Effective Fluorescence Detection of Hydrazine and the Photocatalytic Degradation of Rhodamine B Dye Using CdO-ZnO Nanocomposites." Coatings 12, no. 12 (December 14, 2022): 1959. http://dx.doi.org/10.3390/coatings12121959.

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CdO-ZnO nanocomposites were synthesized using a simple solution approach, and several characterization approaches were used to examine the morphological, structural, phase, vibrational, optical, and compositional properties of these CdO-ZnO nanocomposites. The FESEM study revealed the development of aggregates ranging in size from 250 nm to 500 nm. These aggregates were composed of various CdO-ZnO nanoparticle shapes and sizes. XRD investigation revealed hexagonal wurtzite and cubic phases in ZnO and CdO, respectively. The crystal size was 28.06 nm. The band-gap energy of the produced nanocomposites was calculated using UV-Vis analysis and was determined to be 2.55 eV. The CdO-ZnO nanocomposites were employed as a promising material for the effective fluorescence detection of hydrazine and for the quicker photocatalytic degradation of Rhodamine B (RhB) dye. Within 120 min of UV light exposure, the RhB dye was 87.0% degraded in the presence of the CdO-ZnO nanocomposites and the degradation process followed zero-order and pseudo-first-order kinetics. Based on 3σ IUPAC criteria, the limit of detection for fluorescent hydrazine sensing was 28.01 µM. According to the results presented here, CdO-ZnO nanocomposites may function as both a photocatalyst for the breakdown of organic pollutants as well as an effective luminous sensor for the detection of harmful analytes.
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Hossain, Sk Tofajjen, and Samir Kumar Mukherjee. "CdO Nanoparticle Toxicity on Growth, Morphology, and Cell Division in Escherichia coli." Langmuir 28, no. 48 (November 16, 2012): 16614–22. http://dx.doi.org/10.1021/la302872y.

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Gültekin, Aytaç, Gamze Karanfil, Faruk Özel, Mahmut Kuş, Ridvan Say, and Savaş Sönmezoğlu. "Synthesis and characterisations of Au-nanoparticle-doped TiO2 and CdO thin films." Journal of Physics and Chemistry of Solids 75, no. 6 (June 2014): 775–81. http://dx.doi.org/10.1016/j.jpcs.2014.01.011.

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Das, Anjan. "Removal of defects in CdO nanoparticle and rapid synthesis of CdO nanoflake using novel microwave technique to improve semiconductor device performance." Indian Journal of Science and Technology 14, no. 10 (March 13, 2021): 858–68. http://dx.doi.org/10.17485/ijst/v14i10.1965.

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Kadhim, Khalid Ridha, and Raghad Y. Mohammed. "Effect of Annealing Time on Structure, Morphology, and Optical Properties of Nanostructured CdO Thin Films Prepared by CBD Technique." Crystals 12, no. 9 (September 18, 2022): 1315. http://dx.doi.org/10.3390/cryst12091315.

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Nanostructured cadmium oxide (CdO) thin films were deposited onto glass substrates using the chemical bath deposition (CBD) technique. Different deposition parameters such as deposition time, bath temperature, pH, and CdSO4 concentration have been considered to specify the optimum conditions to obtain uniform and well-adherent thin films. The thin films prepared under these optimum conditions were annealed for different times (20, 40, and 60 min) at 300 °C, where no previous studies had been done to study the effect of annealing time. The XRD analysis showed that the as-deposited film is Cd(OH)2 with a hexagonal phase. While all the annealed films are CdO with a cubic phase. The crystallite size increases with the annealing time. However, the strain, dislocation density, and the number of crystallites were found to be decreased with annealing time. SEM images of annealed films showed a spherical nanoparticle with an average of particle size 80–46 nm. EDX analysis revealed that the ratio of cadmium to oxygen increases with increasing the annealing time to 40 min. The optical characterization shows that the transmittance is in the range of 63–73% and the energy gap is in the range of 2.61–2.56 eV. It has been found that the transmittance increased and the energy gap decreased with the annealing time. The prepared CdO films can be used in photodegradation applications to remove pollutants from water.
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Chaudhari, Sudeshna, A. B. Gaikwad, and P. P. Patil. "Synthesis and corrosion protection aspects of poly(o-toluidine)/CdO nanoparticle composite coatings on mild steel." Journal of Coatings Technology and Research 7, no. 1 (February 7, 2009): 119–29. http://dx.doi.org/10.1007/s11998-008-9160-2.

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Більше джерел

Дисертації з теми "CdO Nanoparticle"

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Geitner, Nicholas. "A Study of Gold Nanoparticles for Application in Semiconductor CdS Nanosheet Biosensor Devices." Miami University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=miami1311893825.

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2

Pujalte, Igor. "Étude in vitro de la toxicité de nanoparticules métalliques (TiO2, ZnO, CdS) sur la cible rénale." Thesis, Bordeaux 2, 2011. http://www.theses.fr/2011BOR21849/document.

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De nombreuses incertitudes persistent sur la toxicité potentielle des nanoparticules (NPs) et leur devenir dans l’organisme humain. L’objectif de ce travail est de mieux comprendre les mécanismes cytotoxiques induits par des NPs métalliques sur une cible secondaire, représentée par le rein. En effet, les NPs sont susceptibles de franchir les barrières cellulaires, d’être véhiculées par le sang pour se retrouver filtrées par le rein au niveau des cellules glomérulaires et peut-être, réabsorbées au niveau des cellules tubulaires. Cette étude est réalisée in vitro, avec des NPs métalliques de titane (TiO2 : 12 nm), de zinc (ZnO : 75 nm) et de cadmium (CdS : 8 nm), sur cellules mésangiales (IP15) et cellules épithéliales tubulaires (HK-2). Les résultats démontrent des effets variables selon le type cellulaire étudié, la nature chimique des NPs et leur solubilité. Si les NPs insolubles de TiO2 (CI50>100 µg/cm²) ne sont que très peu toxiques, les NPs de CdS et de ZnO le sont bien plus du fait de leur solubilité (CI50<7 µg/cm²). La libération de cations métalliques Cd2+ et Zn2+ est à l’origine de cette toxicité. La production d’ERO et la perturbation du statut oxydatif cellulaire (GSH/GSSG) sont corrélées aux effets cytotoxiques des NPs de ZnO et CdS. Une approche moléculaire permet d’identifier les voies de signalisation cellulaire intervenant dans la réponse au stress (translocation nucléaire des facteurs de transcription : Nrf2 et NF-κB). L’internalisation et l’accumulation, des NPs de TiO2 et de CdS, sont responsables de l’induction d’un stress oxydant et d’un effet cytotoxique lors d’exposition sur le long terme
Many uncertainties remain about the potential toxic effect of nanoparticles (NPs), and their becoming in human organism. The aim of this study was to understand the cytotoxic mechanisms induced by metallic NPs, on a secondary target organ, the kidney. NPs were able to cross biological barriers, be carried in blood to kidney cells, on glomerular or tubular cells. This study was performed in vitro, with NPs of titanium (TiO2: 12 nm), zinc (ZnO: 75 nm) and cadmium (CdS: 8 nm), on mesangial IP-15 cells and epithelial HK-2 cells. Results showed effects depending on cell type, chemical nature of NPs and their solubility. TiO2 NPs have no cytotoxic effect (IC50>100µg/cm²), probably due to their insolubility. Exposure to CdS and ZnO NPs lead to cell death (IC50< 7 µg/ cm²). Release of metallic cations Cd2+ and Zn2+ are the main causes of toxicity. ROS production and disruption of oxidative cellular balance (GSH/ GSSG) were correlated to the cytotoxic effects of ZnO and CdS NPs. A molecular approach was used to identify signaling pathways involved in oxidative stress response (nuclear translocation of NF-kappaB and Nrf2).Internalization and accumulation of TiO2 and CdS NPs were responsible of oxidative stress induction and cytotoxic effect on long term exposure
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Lama, Bimala. "Synthesis and Characterization of CdS Nanoparticle/Polymer Composites." University of Akron / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=akron1375797236.

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Rho, Young Gyu. "Quantum-Confined CdS Nanoparticles on DNA Templates." Thesis, University of North Texas, 1998. https://digital.library.unt.edu/ark:/67531/metadc279352/.

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As electronic devices became smaller, interest in quantum-confined semiconductor nanostructures increased. Self-assembled mesoscale semiconductor structures of II-VI nanocrystals are an especially exciting subject because of their controllable band gap and unique photophysical properties. Several preparative methods to synthesize and control the sizes of the individual nanocrystallites and the electronic and optical properties have been intensively studied. Fabrication of patterned nanostructures composed of quantum-confined nanoparticles is the next step toward practical applications. We have developed an innovative method to fabricate diverse nanostructures which relies on the size and a shape of a chosen deoxyribonucleic acid (DNA) template.
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Mirfin, Tayla Michele. "Targeted delivery of GFP loaded polymeric nanoparticles to CD4 expressing cells using a CD4 specific aptamer." University of the Western Cape, 2020. http://hdl.handle.net/11394/8184.

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>Magister Scientiae - MSc
Human Immunodeficiency Virus (HIV), which is the cause of Acquired Immunodefiency Syndrome (AIDS) is a major global public health issue affecting over 37 million people worldwide and is responsible for claiming over 32 million lives since the discovery of the disease in 1981. Through effective diagnosis, treatment and prevention HIV is a manageable disease. Today, advanced antiretrovirals, known as HAART, serve as effective, first-line drug regimens, consisting of a variety of viral inhibitors, and have successfully helped viral suppression. However, issues arise with antiretrovirals due to patient non-adherence and the development of drug resistant mutations. Coupled with dormant HIV reservoirs, viral extinction is attenuated. It is therefore essential that effective alternative treatments are investigated. The exploration of nanomedicine for targeted drug delivery has shown an ability to prolong the drug circulation time, target drugs to specific sites in the body, and enhance drug effectiveness. A previous study demonstrated a novel therapeutic strategy that was based on a mutant version of the caspase-3 enzyme that can induce apoptosis in HIV infected cells. This therapeutic strategy has the potential to wipe out reservoirs of HIV infection. However, the therapeutic strategy lacked selectivity because the delivery mechanism was based on protein transduction technology which will result in the nonselective delivery of the drug. In this study, preliminary work towards the development of a targeted nanoparticle delivery system for this mutant caspase-3 enzyme is described. The study describes the synthesis of green fluorescent protein loaded alginate/chitosan nanoparticles that were functionalized with a DNA aptamer intended to target the nanoparticles to CD4 expressing cells, that are also targeted by HIV. The THP-1 cell line was used due to the ability of the cells to express CD4 receptors on the cell surface. The nanoparticles were synthesized through ionotropic gelation. The size, polydispersity, zeta potential and morphology were investigated by Dynamic Light Scattering and Scanning Electron Microscopy, respectively. The strongly negative zeta potential studies revealed stability of the nanoparticles in suspension and Scanning Electron Microscopy results showed an indicative collapse of the polymer network for the empty nanoparticles (i.e. nanoparticles not loaded with GFP), whereas solid, cuboid nanoparticles were shown for the GFP-loaded nanoparticles. Image-based fluorescence cytometry demonstrated that the GFP-loaded nanoparticles bind to the THP-1 cells that express the CD4 receptor. The results obtained are indicative of a potential drug delivery system for HIV treatment however, adjustments would need to be made to the current study to further develop this nanocarrier.
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Li, Adrienne Victoria. "Immunization with synthetic nanoparticles to generate mucosal CD8 T Cell responses." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/80255.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Biological Engineering, February 2013
Cataloged from PDF version of thesis. "September 2012."
Includes bibliographical references (p. 97-110).
Vaccines have benefited global health by controlling or eradicating life threatening diseases. With better understanding of infectious diseases and immunity, more interest has been placed on stimulating mucosal immune responses with vaccines as mucosal surfaces function as a first line of defense against infections. Progress made in nanoparticle research, in particular the successful use of liposomes for drug delivery, has made liposomes an attractive candidate for vaccine delivery. Here, we investigate the efficacy of using a novel nanoparticle system, Interbilayer Crosslinked Multilamellar Vesicles (ICMVs), as a mucosal vaccine to stimulate mucosal and systemic CD8 immunity. We first assessed the ability of ICMVs to elicit mucosal CD8 response, against the model antigen ovalbumin (OVA), by administration of the nanoparticles through the lungs. We explored the use of 2 different Toll-like receptor agonists (TLRa), monophosphoryl lipid A (MPLA) and Polyinosinic:polycytidylic acid (poly (I:C) or pIC) added to ICMVs as adjuvants. Pulmonary administration of ICMV with both adjuvants was found to give the most potent CD8 T cell response in both systemic and mucosal compartments. We looked further into the quality of the immune response and detected the presence of antigenspecific memory CD8 T cells in the system at ~2.5 months after immunization. The majority of these cells were found to be effector memory cells (CD44hiCD62Llo) and expressed markers for long term survival (CD127hiKLRG1lo), suggesting that long term protection against infection can be induced by pulmonary delivery of ICMVs. We also explored using this system to deliver a model HIV peptide epitope, AL 1, and ICMV successfully induced CD8 response against this epitope. Animals immunized against AL 11 were challenged with a live virus expressing the same epitope and protection was seen only in the pulmonary ICMV treatment group. Virus was delivered via the lungs and viral titre was decreased in both the lungs and ovaries. Neither the soluble form of the vaccine or ICMV delivered via parenteral injection conferred protection. Safety of the ICMV system was also assessed and no significant negative effects were observed in body weight and histological analysis on lungs. Finally, mechanism of using nanoparticles as pulmonary vaccines was investigated to gain better understanding in how particulate vaccine and route of immunization improved the efficacy of a vaccine. Overall, this thesis describes a comprehensive study of systemic and mucosal CD8 responses generated by pulmonary delivery of a novel nanoparticle system. This data provides evidence that mucosal delivery of ICMVs can safely and effectively stimulate disseminated mucosal CD8+ T cells at sites relevant for protection against mucosal infection. A better understanding of nanoparticles for pulmonary immunization was also gained.
by Adrienne Victoria Li.
Ph.D.
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7

Suryajaya. "Study of electrostatically self-assembled thin films of CdS and ZnS nanoparticle semiconductors." Thesis, Sheffield Hallam University, 2007. http://shura.shu.ac.uk/20410/.

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In this work, CdS and ZnS semiconducting colloid nanoparticles coated with organic shell, containing either SO[3-] or NH[2+] groups, were deposited as thin films using the technique of electrostatic self-assembly. The films produced were characterized with UV-vis spectroscopy and spectroscopic ellipsometry - for optical properties; atomic force microscopy (AFM) - for morphology study; mercury probe - for electrical characterisation; and photon counter - for electroluminescence study. UV-vis spectra show a substantial blue shift of the main absorption band of both CdS and ZnS, either in the form of solutions or films, with respect to the bulk materials. The calculation of nanoparticles' radii yields the value of about 1.8 nm for both CdS and ZnS.The fitting of standard ellipsometry data gave the thicknesses (d) of nanoparticle layers of around 5 nm for both CdS and ZnS which corresponds well to the size of particles evaluated from UV-vis spectral data if an additional thickness of the organic shell is taken into account. The values of refractive index (n) and extinction coefficient (k) obtained were about 2.28 and 0.7 at 633 nm wavelength, for both CdS and ZnS.Using total internal reflection (TIRE), the process of alternative deposition of poly-allylamine hydrochloride (PAH) and CdS (or ZnS) layers could be monitored in-situ. The dynamic scan shows that the adsorption kinetic of the first layer of PAH or nanoparticles was slower than that of the next layer. The fitting of TIRE spectra gavethicknesses of about 7 nm and 12 nm for CdS and ZnS, respectively. It supports the suggestion of the formation of three-dimensional aggregates of semiconductor nanoparticles intercalated with polyelectrolyte. AFM images show the formation of large aggregates of nanoparticles, about 40-50 nm, for the films deposited from original colloid solutions, while smaller aggregates, about 12-20 nm, were obtained if the colloid solutions were diluted. Current-voltage (I-V) and capacitance-frequency (C-f) measurements of polyelectrolyte/nanoparticles (CdS or ZnS) films suggest the tunnelling behaviour in the films while capacitance- voltage (C-V) and conductance-voltage (G-V) measurements suggest that these nanoparticles are conductive. The electroluminescence was detected in sandwich structures of (PAH/CdS/PAH)[N] using a photon counting detector, but not in the case of ZnS films.
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Mohamad, Syed Abdul Malik Syed. "Electrical studies on hybrid MIS structures incorporating CdS nanoparticles in organic films." Thesis, Sheffield Hallam University, 2005. http://shura.shu.ac.uk/20004/.

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This project involves the investigation of a.c. and d.c. electrical characterisations and low-frequency noise properties of Langmuir-Blodgett (LB) films in metal-insulator-semiconductor (MIS) structure. Two types of insulating films based on hybrid organic-inorganic materials sandwiched between metal and semiconductor were fabricated. The original insulating films (untreated) were 40 layers Y-type LB films of Cd-salt stearic acid (CdSt[2]). The second type of insulating films were formed after the treatment of CdSt[2] films with H[2]S gas over a period of 12 hours at room temperature to grow CdS nanoparticles within the stearic acid matrix (treated). The capacitance-voltage (C-V) measurement of CdSt[2] LB films exhibit significant dependence on the measurement frequency in the accumulation region due to high d.c. leakage currents. By embedding CdS nanoparticles into the stearic acid matrix, less frequency dependent C-V curves were obtained. The problem in determining the true insulator capacitance due to frequency dispersion was overcome by using the Yang's model. The corresponding dielectric constant of LB films of CdSt[2] was found to be 2.3 and increased to 5.1 when embedded with CdS nanoparticles. The results from the dielectric loss measurement show that both devices agree well with Goswami and Goswami model. By incorporating CdS nanoparticles in the stearic acid matrix, the dielectric loss was found to increase which could be due to electrons being trapped by the CdS nanoparticles. A large current density was observed in the untreated devices at room temperature giving evidence of a leaky dielectric. The analysis of the temperature dependent I-V characteristics shown that current is independent of temperature, similar to the results published by several researchers which explained the current conduction mechanism in term of electron hopping and tunnelling through each bilayer of the LB films. In contrast, by embedding the CdS nanoparticles in the stearic acid matrix the currents have reduced by one-order of magnitude. The temperature dependence of the I-V characteristics showed the dependence of current on the device temperature at low electric field densities whilst less temperature dependence was observed at higher electric field density. Further investigation into the carrier transport mechanism, has found that the Poole-Frenkel effect was the dominant mechanism in the treated devices. A low frequency noise measurement setup has been designed and validated. The results of low-frequency noise measurement reported here are new. 1 / f noise was the only low-frequency noise observed in treated and untreated devices for frequencies up to 1kHz. The current noise spectral density S[I](f), was found to fit well with themodified Hooge's empirical model; [mathematical formula] where C, /, and f are noisemagnitude, current and frequency respectively. The exponential values of gamma and beta were found to lie within the acceptable ranges of 0.7 < gamma < 1.4 and 1 < beta < 3 respectively. The current noise power spectral density (PSD) at several fixed bias current was found to be dependent on the bias current with the PSDs for treated devices found to be approximately two-orders of magnitude higher. These results show that low-frequency noise measurement can be used to probe into the microstructure of the electron devices. It is believed that by embedding the CdS nanoparticles into the stearic acid matrix, electron trapping centres have been created which result in different current conduction behaviour from the untreated LB films of cadmium stearate.
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9

Mousavi, R. A., A. A. Sepahy, and M. R. Fazeli. "Biosynthesis, Purification and Characterization of Cadmium Sulfide Nanoparticles Using Enterobacteriaceae and their Application." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/34903.

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The area of nanotechnology encompasses the synthesis of nanoscale materials, the understanding and the utilization of their physicochemical and optoelectronic properties, and the organization of nanoscale structures into predefined superstructures. The development of biologically inspired experimental processes for the synthesis of nanoparticles is evolving into an important branch of nanotechnology. Nanotechnology has recently emerged as an elementary division of science and technology that investigates and regulates the interaction at cell level between synthetic and biological materials with the help of nanoparticles. A wide range clean, nontoxic and eco-friendly synthesis of nanoparticles is an important aspect of current nanotechnology. Microbial synthesis of nanoparticles is a Green chemistry approach that interconnects nanotechnology and microbial biotechnology. Microorganisms play an important role in the eco-friendly synthesis of metal nanoparticles. This study illustrates the synthesis of CdS nanoparticles using the bactetia of Enterobacteriaceae ( Escherichia coli PTCC 1533 and Klebsiella pneumonia PTCC 1053) after 96 h of incubation at room temperature (30ºc) and pH 9. The morphology of the samples was analyzed using Scanning electron microscopy(SEM). The size of CdS nanoparticles in aqueous solution has been calculated using UV–Vis spectroscopy, XRD, FTIR, EDS and SEM measurements. The nanoparticles are found to be polydisperse in the size range 5–200 nm. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/34903
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Hill, Lawrence J. "Synthesis and Dipolar Assembly of Cobalt-Tipped CdSe@CdS Nanorods." Diss., The University of Arizona, 2014. http://hdl.handle.net/10150/332684.

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This dissertation contains four chapters with advances relevant to the fields of nanoparticle synthesis and nanoparticle self-assembly: a review of nanoparticle self-assembly, or “colloidal polymers”; dumbbell heterostructured nanorod synthesis; dipolar matchstick heterostructured nanorod synthesis; and self-assembly of dipolar matchsticks to form colloidal polymers. These chapters are followed by appendices containing supporting data for chapters two through four. The first chapter is a review summarizing current research involving the 1-D assembly of nanocrystals to form “colloidal polymers.” One of the major goals of materials chemistry is to synthesize hierarchical materials with precise controlled particle ordering covering all length scales of interest (termed, the “bottom up” approach). Recent advances in the synthesis of inorganic colloids have enabled the construction of complex morphologies for particles in the range of 1 – 100 nm. The next level of structural order is to control the structure of assemblies formed from these materials. Linear nanoparticle assemblies are particularly challenging to achieve due to the need to impart functionality to colloids such that (typically) only two sites are active per particle. An emerging idea in the literature which addresses this challenge is to consider linear assemblies of inorganic nanoparticles as colloidal analogs to traditional polymers. This conceptual framework has enabled the formation of linear assemblies having controlled composition (to form segmented and statistical copolymers), architecture (linear, branched, cyclic), and degree of polymerization (chain length). However, this emerging field of synthesizing colloidal polymers has not yet been reviewed in terms of methods to control fundamental polymer parameters. Therefore, linear nanoparticle assembly is reviewed in chapter 1 by applying concepts from traditional polymer science to nanoparticle assembly. The emphasis of chapter 1 is on controlling degree of polymerization, architecture, and composition for colloidal polymers, and seminal examples are highlighted which control these parameters. The second chapter is centered on a novel methodology to install ferromagnetic cobalt domains onto core@shell, “CdSe@CdS” nanorods. While the structures synthesized in this work were novel, the key advance from this work was the development of a methodology to separate nanorod activation from deposition of ferromagnetic cobalt domains onto semiconductor nanorods. As synthesized CdSe@CdS nanorods are passivated with strongly binding phosphonic acid ligands, and these ligands prevent direct deposition of many materials (such as cobalt). Synthetic methods must therefore modify nanorod surfaces prior to deposition of additional nanoparticle domains (tips). Previous synthetic methods for the deposition of magnetic domains onto nanorod termini typically combined activation of nanorod termini and metal deposition into a single synthetic step. While these previous reports were successful in achieving tipped nanorods, the coupling of these two reactions required matching the kinetics of nanorod activation and decomposition/reduction of metal precursors in order to achieve the desired heterostructure morphology. However, the presence of ligands used for nanorod activation can also affect the rate of metal precursor decomposition/reduction and the propensity of the metal to form free nanoparticles through homogeneous nucleation. Thus, simultaneous nanorod activation and metal deposition hinders modification of these syntheses to obtain differing heterostructured morphologies. In the work presented in chapter 2, we chemically activate nanorod termini towards cobalt deposition in a separate chemical step from deposition of metallic cobalt nanoparticle domains. First, reductive platinum deposition conditions were utilized to activate nanorod termini towards the deposition of cobalt domains, which were deposited in a subsequent reaction step. Then, the kinetics of nanorod activation during platinum deposition were tracked, and the platinum-tipped nanorod morphologies were correlated with the results of subsequent cobalt deposition reactions. Ultimately, controlled placement of cobalt domains onto one or both nanorod termini was demonstrated based on the degree of activation during platinum deposition. Cobalt nanoparticle tips were then selectively oxidized to form CoₓOy-tipped nanorods, which were a novel class of p-n type nanomaterials achieved over a total of five synthetic steps. Relevant supporting details for the synthesis of these dumbbell tipped nanorods are provided in Appendix A. The third chapter describes the synthesis of CoNP-tipped nanorods with a single, strongly dipolar, ferromagnetic CoNP-tip per nanorod. The key synthetic advance was the ability to activate a single terminus per nanorod without activation of lateral nanorod facets, which was vital in achieving these larger, dipolar, cobalt tips (rather than lateral decoration of cobalt onto nanorod lateral facets). These dipolar “matchstick” CoNP-tipped nanorods then spontaneously formed linear assemblies carrying nanorod side chains as pendant functionality. Activation of CdSe@CdS nanorods was found to occur through the deposition of small (< 2 nm) PtNP-tips which were not readily observable by standard characterization techniques. The finding that small (< 2 nm) PtNP-tips altered nanorod reactivity towards cobalt deposition emphasized the effect of subtle changes to nanorod surface chemistry. Relevant supporting details for the synthesis of these dipolar matchstick tipped nanorods are provided in appendix B. The fourth chapter is centered on the self-assembly of dipolar matchstick cobalt-tipped nanorods to form colloidal (co)polymers reminiscent of traditional bottlebrush polymers, with controlled composition and phase behavior on carbon surfaces. Similar to earlier findings in traditional polymer science, nanorod side chain length was found to significantly impact surface assembly of these colloidal analogs of bottlebrush copolymers, which provided a useful parameter for affecting surface wetting and phase behavior of nanoparticle thin films. This work was also the first demonstration of colloidal copolymers from the dipolar assembly of magnetic nanoparticles, where both segmented and statistical copolymer compositions were achieved. We then demonstrated, for the first time, that a colloidal copolymer with segmented composition can form a mesoscopic phase separated morphology which is similar to that observed for traditional block copolymers. This key advance opens the possibility of controlling structural ordering over still longer length scales by the development of methods to control phase separated morphologies in a manner similar to traditional block copolymers. Relevant supporting details for the synthesis and assembly of these colloidal bottlebrush polymers are provided in appendix C.
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Книги з теми "CdO Nanoparticle"

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Schiener, Andreas. Mikrosekundenaufgelöste In-situ-SAXS-Experimente zum Nukleations- und Wachstumsverhalten von CdS-Nanopartikeln in wässriger Lösung. Erlangen: Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017.

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2

Visweswara Rao, Pasupuleti, Balam Satheesh Krishna, and Mohammad Saffree Jeffree, eds. Coronaviruses Transmission, Frontliners, Nanotechnology and Economy. UMS Press, 2022. http://dx.doi.org/10.51200/coronavirusesdrraoums2021.

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Coronaviruses are the viruses which cause different types of diseases in humans and animals. They belong to Coronaviridae family. Coronaviruses have unique shape which consists of spiked rings and sometimes to deal with them is a tough task. They are the tiny organisms which can only be seen under the microscopes. Even though the corona viruses exist in nature since decades, however the seriousness is only seen with the pandemic SARS-CoV II or COVID-19. It has taken so many lives away and the loss of various businesses. Keeping in view these situations, the authors and editors try to bring few of the important aspects together and compiled this book. The transmissions occur through different means and the vaccines are under production by various giant companies. Second chapter deals with animals as sources of transmitting agents to spread corona virus. Up to date the Centre for Disease Control and Prevention (CDC) recognizes 7 species of coronaviruses that infect humans, with the earliest known species identified in the mid-1960s. The known human coronaviruses are 229E (alpha coronavirus), NL63 (alpha coronavirus), OC43 (beta coronavirus), HKU1 (beta coronavirus), MERS-CoV (causes Middle East Respiratory Syndrome, MERS), SARS-CoV (causes Severe Acute Respiratory Syndrome, SARS) and SARS-CoV-2 (causes the coronavirus disease also in 2019, also known as COVID-19). Third chapter dealt with risk assessment for front liners during COVID-19 pandemic and clearly explained about the risk assessment factors. Healthcare workers (HCWs) are on the frontline of treating patients infected with COVID-19. However, data related to its infection rate among HCWs are limited. Chapter 4 deals with the nanotechnology and its applications on viral diseases. Nanobiotechnology is science of nanoparticle synthesis by using biotechnological applications in biology, physics, engineering, drug delivery, diagnostics, and chemistry. The use of metal/ polymeric nanoparticles as drug delivery systems has become extensive in last two decades. The commercialization of developed novel nanoparticles/drug loaded polymeric nanoparticles delivery systems are required to eradicate virus with improved safety measures in the humans with affordable cost. Chapter 5 mainly focused on the impact of COVID -19 on China, Malaysia, Indonesia, and India. The outbreak of the Covid-19 pandemic is an unprecedented shock to the Emerging economies. The evidence reported in various studies indicates that epidemic disease impacts on a country's economy through several channels, including the health, transportation, agricultural and tourism sectors. In the chapter 6, the authors discussed the psychological response, ranges from adaptive to maladaptive spectrum. We wish to express our gratitude to all the authors and contributors from Malaysia, Indonesia, and India for readily accepting our invitation and timely contributions without any delay. We greatly appreciate their commitment. We also thank Universiti Malaysia Sabah and Universitas Abdurrab for the great collaboration and collaborative efforts.
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Auciello, Orlando, ed. Ultrananocrystalline Diamond Coatings for Next-Generation High-Tech and Medical Devices. Cambridge University Press, 2022. http://dx.doi.org/10.1017/9781316105177.

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A comprehensive guide to the science of a transformational ultrananocrystalline-diamond (UNCDTM) thin film technology enabling a new generation of high-tech and external and implantable medical devices. Edited and co-authored by a co-originator and pioneer in the field, it describes the synthesis and material properties of UNCDTM coatings and multifunctional oxide/nitride thin films and nanoparticles, and how these technologies can be integrated into the development of implantable and external medical devices and treatments of human biological conditions. Bringing together contributions from experts around the world, it covers a range of clinical applications, including ocular implants, glaucoma treatment devices, implantable prostheses, scaffolds for stem cell growth and differentiation, Li-ion batteries for defibrillators and pacemakers, and drug delivery and sensor devices. Technology transfer and regulatory issues are also covered. This is essential reading for researchers, engineers and practitioners in the field of high-tech and medical device technologies across materials science and biomedical engineering.
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Частини книг з теми "CdO Nanoparticle"

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Das, Anjan. "Electron Momentum Distribution Around Vacancy Cluster in CdO Nanoparticles." In Lecture Notes in Bioengineering, 449–55. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7409-2_45.

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Lee, Sang-Suk, Eun-Jae Kim, Mikyung Kang, Hasung Kang, Sang-Heon Choi, Dain Jeon, Jong-Gu Choi, Yukyoung Choi, Hyunsook Lee, and Mahbub Hasan. "Flow Characteristics of the Conjugate of Anti-CD3 Monoclonal Antibodies and Magnetic Nanoparticle in PBS and Blood Vessels." In Advances in Experimental Medicine and Biology, 357–62. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-14190-4_58.

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Zhao, Na Ru, Ying Jun Wang, Xiao Feng Chen, Yu Xia Yang, Kun Wei, and Gang Wu. "Preparation of Bioactive Nanoparticles in the System CaO-P2O5-SiO2 Using Microemulsions." In Advanced Biomaterials VI, 179–82. Stafa: Trans Tech Publications Ltd., 2005. http://dx.doi.org/10.4028/0-87849-967-9.179.

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4

Eddy, Nnabuk Okon, and Rajni Garg. "CaO Nanoparticles." In Handbook of Research on Green Synthesis and Applications of Nanomaterials, 247–68. IGI Global, 2022. http://dx.doi.org/10.4018/978-1-7998-8936-6.ch011.

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Adsorption is widely acknowledged as one of the best options that are available for the removal of contaminants from water. Contamination of water does not only create water scarcity, but it has the capacity to generate and transfer several environmental problems including threat to public health. This chapter reviewed calcium oxide nanoparticle (CaONP) as a noble metal oxide for the removal of contaminants from water. The review is concentrated in the general overview of water contamination, metal oxide nanoparticles, general application of CaONP, synthetic methods, characterization method, and applications. The chapter observed that little is done on the use of CaONP for the removal of contaminants from water except for dyes, some heavy metal ions, and few organic/inorganic compounds. It is also observed that CaONP can be applied as adsorbent and in photocatalytic degradation of dye. Suggestions are made on the possibility of utilizing local raw materials that are easily accessible, cheap, and environmental sources of raw materials for the synthesis of CaONP.
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Okoth, Kevin Otieno, Ruth Nduta Wanjau, and Maurice Otieno Odago. "Semiconductor Nanocomposites-Based Photoelectrochemical Aptamer Sensors for Pharmaceuticals Detection." In Research Anthology on Synthesis, Characterization, and Applications of Nanomaterials, 685–708. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-8591-7.ch030.

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Development of sensors for pharmaceuticals has become very essential. This is due to the need to monitor the release and toxicological effects of pharmaceuticals into the environment. In this work, the authors explored bismuth sulphide (Bi2S3) nanorods and graphene as photoactive material for constructing a photoelectrochemical (PEC) aptasensor for sulfadimethoxine (SDM) detection, exhibiting high sensitivity, stability, and reproducibility. In another experiment, Mo-doped BiVO4 (Mo-BiVO4) and graphene nanocomposites were explored as photoactive material to construct a visible light-driven photoelectrochemical biosensor. Graphene in the nanocomposites was very essential in immobilizing streptomycin aptamer through π-π stacking interaction. Finally, graphene doped CdS (GR-CdS) synthesized via one pot hydrothermal technique and gold nanoparticles (Au NPs) were employed to construct a PEC aptasensor for diclofenac (DCF).
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Okoth, Kevin Otieno, Ruth Nduta Wanjau, and Maurice Otieno Odago. "Semiconductor Nanocomposites-Based Photoelectrochemical Aptamer Sensors for Pharmaceuticals Detection." In Advances in Environmental Engineering and Green Technologies, 109–32. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1871-7.ch007.

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Анотація:
Development of sensors for pharmaceuticals has become very essential. This is due to the need to monitor the release and toxicological effects of pharmaceuticals into the environment. In this work, the authors explored bismuth sulphide (Bi2S3) nanorods and graphene as photoactive material for constructing a photoelectrochemical (PEC) aptasensor for sulfadimethoxine (SDM) detection, exhibiting high sensitivity, stability, and reproducibility. In another experiment, Mo-doped BiVO4 (Mo-BiVO4) and graphene nanocomposites were explored as photoactive material to construct a visible light-driven photoelectrochemical biosensor. Graphene in the nanocomposites was very essential in immobilizing streptomycin aptamer through π-π stacking interaction. Finally, graphene doped CdS (GR-CdS) synthesized via one pot hydrothermal technique and gold nanoparticles (Au NPs) were employed to construct a PEC aptasensor for diclofenac (DCF).
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Rai, S. "Effect of Nanostructure-Materials on Optical Properties of Some Rare Earth ions (Eu3+ ,Sm3+&Tb3+) Doped in Silica Matrix." In Advanced Materials and Nano Systems: Theory and Experiment - Part 2, 108–19. BENTHAM SCIENCE PUBLISHERS, 2022. http://dx.doi.org/10.2174/9789815049961122020011.

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Nanoparticles of CdS incorporated in Rare Earth doped silica xerogel (RE3+:SiO2) matrix have been prepared by sol-gel method to study its various aspect. The prepared materials have been characterized by physical and optical technique, such as XRD, SEM, TEM and Photoluminescence (PL). We can conclude from TEM that the particle size of the materials 8 nm and an average particle dimension of 5 nm. It is also found consistent with the theoretical calculation performed based on the Scherrer equation and effective mass approximation (EMA) model. The optical properties of these materials depend on various parameters such as dimension and surface characteristics, doping and interaction with the surrounding environment. Enhancements of Rare Earth (RE) ions luminescence have been observed with the presence of CdS NPs in RE3+:SiO2 matrix. A twenty time more intense dominating orange peaks (616 nm) from the characteristic peak of Eu3+ ions are observed for CdS/Eu3+:SiO2 matrix compared to the sample without CdS NPs. The efficient energy transfer (ET) from CdS NPs to RE ions is primarily responsible for this boost in the luminescence intensity. The emission intensity in PL spectra decreases with raise in the concentration of CdS NPs. With an increase in CdS NPs concentration in RE3+:SiO2 matrix, the emission intensity decreases possibly due to the increase in the concentration of “oxygen vacancy ”and “Si hanging” in the matrix of the silica xerogel. Thus, photoluminescence properties of the material are greatly influenced by site symmetry and hence the concentration of dopant ions.
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Oliveira, Noelio, and Ernesto Soares de Freitas Neto. "Carrier Dynamics and Magneto-Optical Properties of Cd1-xMnxS Nanoparticles." In Nanocrystals - Synthesis, Characterization and Applications. InTech, 2012. http://dx.doi.org/10.5772/48713.

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Dostert, G., V. Jouan-Hureaux, H. Louis, and É. Velot. "Umbilical Mesenchymal Stem Cell-Derived Extracellular Vesicle Conditioning Has an Immunosuppressive Effect on NK Cells." In Stem Cells and Regenerative Medicine. IOS Press, 2021. http://dx.doi.org/10.3233/bhr210028.

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Background: In peripheral blood, human natural killer (NK) cells are immunological cells that nearly don’t express the ectonucleotidase CD73 on their plasma membrane. When exposed to mesenchymal stem cells (MSCs), NK cells are able to acquire CD73. MSCs are known to be CD73-positive (CD73+) and also to modulate the immune system, e.g. through adenosynergic pathway by ectonucleosidases, such as CD73. Extracellular vesicles (EVs) are involved in cell-to-cell communication. Mesenchymal stem cell-derived extracellular vesicles (MSC-EVs) have emerged as paracrine mediators that are part of MSC immunomodulatory effects including immunosuppressive properties and immune privilege. Objective: The aim of our work was to study if CD73 could be acquired by NK cells through cell-to-cell communication with MSC-EVs as cell culture additives. We also hypothesised that MSC-EVs would act as tolerance inducers to attenuate NK cell cytotoxicity. Methods: Cell isolation was made from human umbilical cords for MSCs and from human peripheral blood for NK cells. MSC-EVs were isolated by ultracentrifugation and filtration, then characterized by nanoparticle tracking assay and flow cytometry (CD9, 63, 81 and 73). MSC-EV interaction with NK cells was monitored by PKH67 staining. NK cell activation was followed by measuring the expression of CD73 and NK-activating receptor natural-killer group 2, member D (NKG2D) by flow cytometry. The cytotoxicity of NK cells or EV-conditioned NK cells was evaluated after co-culture with K562 cells. Results: We showed that MSC-EVs are nanoparticles able to express CD73 and interact with NK cells. MSC-EV conditioned NK cells seem to increase CD73 and decrease NKG2D through an EV-mediated mechanism. MSC-EVs have an immunosuppressive effect on NK cells by preventing NK cell activation and NK cell cytotoxicity towards K562 cells. Conclusions: Our results demonstrate that MSC-EVs could influence NK cell behaviour and act as immunosuppressant cell-based products.
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Rout, Smruti Rekha, Gowtham Kenguva, Deepika Sharma, Amirhossein Sahebkar, Vidhu Aeri, Prashant Kesharwani, and Rambabu Dandela. "Gene therapy using PLGA nanoparticles." In Poly(Lactic-Co-glycolic Acid) (PLGA) Nanoparticles for Drug Delivery, 393–414. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-91215-0.00009-1.

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Тези доповідей конференцій з теми "CdO Nanoparticle"

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Peterson, Daniel A., C. Padmavathi, and Brian K. Paul. "High Production Rate Synthesis of CdS Nanoparticles Using a Reverse Oscillatory Flow Method." In ASME 2014 International Manufacturing Science and Engineering Conference collocated with the JSME 2014 International Conference on Materials and Processing and the 42nd North American Manufacturing Research Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/msec2014-3957.

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A reverse oscillatory flow (ROF) mixing system is discussed having a reaction channel 460 μm high by 152 mm wide for high flow rate processing of nanoparticle chemistries. The ROF system is demonstrated to produce CdS nanoparticles at a production rate of 115.7 g/hour with a coefficient of variation for particle size down to 19%. These production rates are substantially higher than those achieved using other microchannel mixers while maintaining comparable size distributions. Advantages of the ROF approach include the use of larger microchannels which make the reactor easier to fabricate and less vulnerable to clogging.
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Susila, V. M., R. N. Mariammal, K. Ramachandran, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Phonons and Thermal Parameters of CdO Nanoparticles." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3606117.

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Zhong, Xingjian, Alexander M. Saeboe, Umar Iqbal, Dongling Zhang, Maria J. Moreno, and Allison M. Dennis. "Engineering PbS/CdS quantum dots for NIR-II multiplexed imaging." In Colloidal Nanoparticles for Biomedical Applications XVII, edited by Marek Osiński and Antonios G. Kanaras. SPIE, 2022. http://dx.doi.org/10.1117/12.2607967.

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Hussain, Syed Zajif, Irshad Hussain, Faheem Amin, Nadeem Sabir, and Wahid Qayyum. "Photoluminescence properties of Co and Ni co-doped CdS/ZnS core/shell nanoparticles." In Colloidal Nanoparticles for Biomedical Applications XIII, edited by Xing-Jie Liang, Wolfgang J. Parak, and Marek Osiński. SPIE, 2018. http://dx.doi.org/10.1117/12.2291454.

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Zhong, Xingjian, Amish Patel, and Allison M. Dennis. "PbS/CdS QDs enabled SWIR imaging for lymphatic mapping and multiplexed lymph node imaging (Conference Presentation)." In Colloidal Nanoparticles for Biomedical Applications XVIII, edited by Marek Osiński and Antonios G. Kanaras. SPIE, 2023. http://dx.doi.org/10.1117/12.2649410.

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Ghosh, Anirudha, Sanhita Paul, and Satyabrata Raj. "Structural stability of CdS nanoparticles." In PROCEEDING OF INTERNATIONAL CONFERENCE ON RECENT TRENDS IN APPLIED PHYSICS AND MATERIAL SCIENCE: RAM 2013. AIP, 2013. http://dx.doi.org/10.1063/1.4810100.

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Sabir, Nadeem, Wahid Qayyum, Faizan Ali, and Faheem Ameen. "Optical study of the transition metals (M=Cr, Mn, Co, Ni, Cu) doped M-CdS/ZnS core/shell nanoparticles." In Colloidal Nanoparticles for Biomedical Applications XIV, edited by Wolfgang J. Parak and Marek Osiński. SPIE, 2019. http://dx.doi.org/10.1117/12.2509840.

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Palanisamy, Barath, Yu-Wei Su, Anna Garrison, Brian Paul, and Chih-hung Chang. "Cadmium Sulfide Nanoparticle Synthesis Using Oscillatory Flow Mixing." In ASME 2011 International Manufacturing Science and Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/msec2011-50276.

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Microchannel mixers enable faster mixing times compared with batch stir mixing leading to the promise of higher throughput, better yields and less solvent usage for the solution-phase reactive precipitation of inorganic nanoparticles. However, reliance on diffusive transport for subsecond mixing requires channel dimensions in the tens of micrometers. These channel dimensions make diffusive micromixers vulnerable to clogging. In this paper, an oscillatory flow mixing strategy is explored to increase the contact area between reagents within larger microchannels. Forward and reverse oscillatory signals are designed to pump reactants through a 450 μm high serpentine microchannel to increase advection within the flow. Computational fluid dynamics simulations are performed to provide insight into flow behavior and nanoparticle morphology. Quantification of mixing performance is proposed using mixing quality and particle residence time metrics. Experimental validation is pursued through the reactive precipitation of CdS quantum dots using a reverse oscillatory mixing setup. Transmission electron microscopy provides insights into the particle size distribution and particle crystallinity.
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Lin, Ching-Fuh, Eih-Zhe Liang, Sheng-Ming Shih, and Wei-Fang Su. "CdS nanoparticle light-emitting diode on Si." In Symposium on Integrated Optoelectronic Devices, edited by E. F. Schubert and H. Walter Yao. SPIE, 2002. http://dx.doi.org/10.1117/12.469209.

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Chandran, Anoop, M. Soosen Samuel, Jiji Koshy, K. C. George, Alka B. Garg, R. Mittal, and R. Mukhopadhyay. "Gaussian Confinement of Phonons in CdS Nanoparticles." In SOLID STATE PHYSICS, PROCEEDINGS OF THE 55TH DAE SOLID STATE PHYSICS SYMPOSIUM 2010. AIP, 2011. http://dx.doi.org/10.1063/1.3605868.

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Звіти організацій з теми "CdO Nanoparticle"

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Chefetz, Benny, Baoshan Xing, and Yona Chen. Interactions of engineered nanoparticles with dissolved organic matter (DOM) and organic contaminants in water. United States Department of Agriculture, January 2013. http://dx.doi.org/10.32747/2013.7699863.bard.

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Background: Engineered carbon nanotubes (CNTs) are expected to be increasingly released into the environment with the rapid increase in their production and use. The discharged CNTs may interact with coexisting contaminants and subsequently change environmental behaviors and ecological effects of both the CNTs themselves and the contaminants. Dissolved organic matter (DOM) plays a critical role in the transport of CNTs in the aquatic environment, affecting both CNT's surface properties through adsorption, and its colloidal stability in solution. Therefore, CNT-bound DOM complexes may interact with coexisting contaminants, thus affecting their environmental fate. With increasing production and use of CNTs, there is an increasing risk that humans could be exposed to CNTs mainly through ingestion and inhalation. Since CNTs can be carriers of contaminants due to their high adsorption affinity and capacity, the distribution of these nanoparticles in the environment holds a potential environmental and health risk. Project objectives: The overall goal of this project was to gain a better understanding of the environmental behavior of engineered nanoparticles with DOM and organic pollutant in aqueous systems. The scope of this study includes: characterizing various types of engineered nanoparticles and their interaction with DOM; binding studies of organic contaminants by nanoparticles and DOM-nanoparticle complexes; and examining interactions in DOM-nanoparticles-contaminant systems. Major conclusions, solutions and achievements: DOM has a pronounced effect on colloidal stability of CNTs in solution and on their surface chemistry and reactivity toward associated contaminants. The structure and chemical makeup of both CNTs and DOM determine their interactions and nature of formed complexes. CNTs, contaminants and DOM can co-occur in the aquatic environment. The occurrence of co-contaminants, as well as of co-introduction of DOM, was found to suppress the adsorption of organic contaminants to CNTs through both competition over adsorption sites and direct interactions in solution. Furthermore, the release of residual contaminants from CNTs could be enhanced by biomolecules found in the digestive as well as the respiratory tracts, thus increasing the bioaccessibility of adsorbed contaminants and possibly the overall toxicity of contaminant-associated CNTs. Contaminant desorption could be promoted by both solubilization and sorptive competition by biological surfactants. Scientific and agricultural implications: The information gained in the current project may assist in predicting the transport and fate of both CNTs and associated contaminants in the natural environment. Furthermore, the results imply a serious health risk from contaminant-associated CNTs.
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Kedzierski, Mark A. Effect of CuO nanoparticle concentration on R134alubricant pool boiling heat transfer with extensive analysis. Gaithersburg, MD: National Institute of Standards and Technology, 2007. http://dx.doi.org/10.6028/nist.ir.7450.

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Kedzierski, Mark A., and Maoqiong Gong. Effect of CuO nanoparticle concentration on R134a pool boiling heat transfer with extensive measurement and analysis detail. Gaithersburg, MD: National Institute of Standards and Technology, 2007. http://dx.doi.org/10.6028/nist.ir.7454.

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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
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NREL Improves Hole Transport in Sensitized CdS-NiO Nanoparticle Photocathodes (Fact Sheet). Office of Scientific and Technical Information (OSTI), January 2012. http://dx.doi.org/10.2172/1033818.

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