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Nanoparticles

Xem 1-20 trên 883 kết quả Nanoparticles
  • Metal nanoparticles are certain to be the building blocks of the next generation of electronic, optoelectronic and chemical sensing devices. The physical limits imposed by top-down methods such as photo- and electron- beam lithography dictate that the synthesis and assembly of functional nanoscale materials will become the province of chemists.

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  • Fe3O4 nanoparticles have been prepared by the microemulsion technique with water as the aqueous phase, n-hexane as the oil phase and Span 80 as the surfactant. The reaction occurred under air, N2 or high temperature and high pressure atmosphere. Particle size can be controlled by the concentration of the reactants dissolved in water, the ratio of water/surfactant and the atmospheric conditions.

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  • Groundwater remediation by nanoparticles has become a major interest in recent years. This report presents the ability of hexavalent chromium removal in aqueous using iron (Fe0) nanoparticles. Cr(VI) is a major pollution of groundwater and more toxic than Cr(III). Fe0 reduces Cr(VI), transforming Cr(VI) to nontoxic Cr(III). At a dose of 0.2g/l iron (Feo) nanoparticles, 100% of Cr(VI) 5mg/l was removed after only 20 minutes. The Cr(VI) removal efficiency increased with decreasing initial pH.

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  • In this communication, we report the synthesis of chitosan (CS, a biodegradable and biocom- patible natural polymer) [1] nanoparticles as drug carriers by ionic gelation. The method is based on ionic interactions between positively charged groups NH3 + of CS (in dilute CH3COOH solution) and negatively charged of sodium tripolyphos- phate, TPP).

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  • Bài thuyết trình Magnetic nanoparticles: synthesis, functionalization, and applications in bioimaging and magnetic energy storage bao gồm những nội dung về phương pháp tổng hợp tạo hạt nano từ, chức năng của hạt nano từ, ứng dụng của hạt nano từ trong sinh học và lưu trữ dữ liệu.

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  • We studied to prepare silver nanoparticle substrate for Surface-Enhance Raman Scattering (SERS). Silver nanoparticles were produced by laser ablation of silver plate in ethanol. The average size of silver nanoparticles is 15nm. The silver nanoparticle colloid was allowed to dry on a silicon wafer to prepare SERS substrate. Using the silver nanoparticle substrates we could obtain SERS spectrum of Rhodamine 6G molecules adsorbed on silver nanoparticles. The Raman signal was enhanced strongly by our SERS substrate.

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  • In  Molecular simulation of nanoparticle diffusion at fluid interfaces molecular dynamics simulations are used to exam- ine the transport properties of a nanoparticle in both bulk solvent and at a liquid–liquid interface. Specifically it aims to address the effect of interfacial adsorption on the diffusion of nanoparticles (at low concentration).

     

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  • The synthesis and characterization of chitosan (CS) nanoparticles used as drug carrier was reported. The formation of nanoparticles, taking place in an aqueous phase without using auxiliary toxic substances via the ionic interaction between NH3 + protonated group of CS and phosphate group of sodium tripolyphosphate (TPP) was monitored in situ by combined UV-vis and pH measurements. The synthesized nanoparticles were characterized by TGA/DTA, XRD and TEM. The particle size, estimated by TEM, was found around 50 - 70 nm, with a quite uniform size distribution.

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  • Colloidal silver nanoparticles were synthesized by Co-60 ray irradiation of Ag+ in aqueous solution containing polyvinyl alcohol (PVA) as stabilizer and 0.5 M ethyl alcohol as free radical (OH• ) scavenger. The effect of Ag+ concentration which varied from 1 to 50 mM on the saturated conversion dose (D) of Ag+ into Ag determined by UV-vis spectroscopy and the size of Ag nanoparticles characterized by transmission electron microscopy (TEM) were investigated. The dependence of D (kGy) and average size (d, nm) of Ag nanoparticles on Ag+ concentration was found out to be as: D (kGy) = 0.

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  • Products of nanotechnology are expected to revolutionize modern medicine, as evidenced by recent scientific advances and global initiatives to support nanotechnology and nanomedicine research. The field of drug delivery is a direct beneficiary of these advancements. Due to their versatility in targeting tissues, accessing deep molecular targets, and controlling drug release, nanoparticles are helping address challenges to face the delivery of modern, as well as conventional drugs.

    pdf427p thuytienvang_1 31-10-2012 36 1   Download

  • Laser-induced thermal explosion of metallic nanoparticles originates from nonlinear optical effect. Nonlinear optical properties of nanoparticle materials depend strongly on their size and shape. Several methods were proposed to produce nanoparticles of a controlled size and welldefined distribution. We studied to prepare silver nanoparticles by laser ablation. The characteristic spectral feature of the silver nanoparticles (peak around 400nm) was found in the absorption spectra measured by a UV-Vis 2450 spectrometer. ...

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  • Synthesis of the copper nanoparticles colloidal solutions by chemical reduction method with various precursors including copper oxalate, CuCl2, CuSO4, Cu(NO3)2 with hydrazine hydrate reducing agent, NaBH4; solvent glycerin and water, PVA and PVP protection, dispersants and protective agents: including trisodium citrate, ascorbic acid, CTAB.

    pdf26p change05 10-06-2016 25 1   Download

  • In this research, silver nanoparticles were dispersed into acrylic emulsion by high-speed stirring method using scattered disc at room temperature. Antibacterial activity of the mixture was examined through changes of some parameters such as nanosilver concentration, dispersing time and water addition amount.

    pdf8p ironman1234 06-06-2018 14 1   Download

  • The goad of the thesis is to build the manufacture process of nano-sized magnetic fluids based on iron oxide (uniform particle size and high magnetic saturation) with stable technology; Characteristic research of magnetic properties of magnetic nanoparticles; assessment of toxicity and test of effects on cells, aiming to make contrast medicine in imaging diagnosis by magnetic resonance imaging (MRI), application on accurately identifying cancer.

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  • Research targets of the thesis: Fabricating spinel ferrite nanoparticle M1-xZnxFe2O4 (M = Mn, Co; 0,0 ≤x≤0,7) with controlled parameters affecting to Hc , TC and D. Establishing semi-experimental models based on experimental results to explain the correlation between SLP and (Keff, D) in order to figure out suitable mechanisms for calculating SLP value of CoFe2O4 nanoparticle.

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  • Nanoparticle-mediated targeted delivery of bioactive natural compounds has recently been gaining much interest for breast cancer therapy. Herein, phenyl boronic acid (PBA)-conjugated and pH-responsive ZnO nanoparticles (diameter 40 nm) were synthesized for the tumor tissue-specific delivery of curcumin. PBA conjugation facilitates the targeted delivery of curcumin to the sialic acid overexpressed in breast cancer cell membranes.

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  • 16S rRNA gene sequences are most commonly used for determination or studying the bacterial phylogeny and taxonomy because its present in almost all bacterial population. 16S rRNA gene sequence is remaining conversed during evolution so that 16S rRNA gene identification method is widely used for identification of bacterial diversity. In this study, bacterial population was isolated from soil sample for copper nanoparticles synthesis and maximum copper synthesizing bacteria further used for characterization.

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  • The green synthesis of nanoparticles is an eco-friendly approach which is inexpensive and non-hazardous. Numerous plant extracts are used in the synthesis of nanoparticles from neem leaf, lemongrass, aloe vera, moringa leaves, etc.

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  • Plant mediated synthesis or green synthesis of nanoparticles is gaining importance due to its simplicity, eco-friendly nature, rapid rate of synthesis, less cost and due to the disadvantages associated with chemical synthesis. The bio-active molecules present in the plant extracts are utilized for the synthesis of zinc oxide nanoparticles from its bulk molecules.

    pdf9p chauchaungayxua4 18-03-2020 9 1   Download

  • Cell responses and mechanical properties are vital for scaffold in bone regeneration. Fe3O4 nanoparticles with excellent magnetism can provide magnetic stimulation for cell growth, while graphene oxide (GO) nanosheets are commonly used as reinforcement phases due to their high strength. However, Fe3O4 or GO is tended to agglomerate in matrix. In present study, a novel co-dispersed Fe3O4-GO nanosystem was constructed through electrostatic self-assembly of positively charged Fe3O4 (pFe3O4) on negatively charged GO nanosheets.

    pdf13p partimesinhvien 08-05-2020 9 1   Download

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