Developing of buffer-precipitation method for lead metaborate (Pb(BO2)2 H2O) nanostructures

AbstractAmorphous lead metaborate (Pb(BO2)2 H2O) nanostructures were synthesized by a simpl and cost-effective synthesis method which is based on precipitation of lead ions using boric acid/sodium hydroxide buffer (pH 9.2) in the presence of polyethylene glycol (PEG). Scanning electron microscopy images showed that the average particle size is 30±9 nm and the particle shape is mostly spherical. The chemical formulation of Pb(BO2)2 H2O was confirmed by infrared spectroscopy, inductively coupled plasma and thermal gravimetric analysis (TGA). The percentage of PEG molecules on the particle surface equal to 2.5 % was determined by TGA. Optical reflectance measurement was performed by UV-Vis spectroscopy. Based on the Kubelka-Munk function, it was calculated that the Pb(BO2)2 H2O nanostructures have a direct band gap of 4.6 eV.

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Stannous Oxide Thick Film Nanosensors Design by Screen Printing Technology: Structural, Electrical Parameters and H2s Gas Detection Study

Material Science Research India ◽

10.13005//msri/180108 ◽

2021 ◽

Vol 18 (1) ◽

pp. 66-74

Author(s):

Umesh Jagannath Tupe ◽

Arun Vitthal Patil ◽

Madhukar Sarvottam Zambare ◽

Prashant Bhimrao Koli

Keyword(s):

Hydrogen Sulfide ◽

Thick Film ◽

Screen Printing ◽

Sno2 Nanoparticles ◽

Average Particle Size ◽

Cost Effective ◽

Surface Characteristic ◽

Precipitation Method ◽

Average Particle ◽

Stannous Oxide

The present research deals with the fabrication of stannous oxide nanoparticles by conventional and cost effective co precipitation method. The thick film sensors of SnO2 nanoparticles were prepared by standard screen-printing technique by photolithography. The prepared SnO2 material was characterized by several techniques to confirm the structural properties. Initially, the prepared nanoparticles of SnO2 were investigated by x-ray diffraction technique to confirm the synthesis of prepared material within nanoscale. From XRD data the average particle size of prepared thick films was found to be 21.87 nm calculated using Debye-Scherer formula. The material was further characterized by using scanning electron microscopy (SEM) to investigate the structural and surface characteristic of SnO2. SEM data clearly indicates the heterogeneous surface, and some voids present over the surface of SnO2 nanoparticles. The Fourier transfer infra red technique was employed to investigate the metal oxygen frequency of SnO2 material. The prepared sensor was exclusively utilized to sense the hydrogen sulfide gas vapors at various concentrations. The prepared sensor was found to be highly sensitive to H2S vapors nearly 63.8% sensitivity was recorded. The response and recovery study shows the response time of 9 seconds and recovery time of 19 seconds for hydrogen sulfide gas vapors. The SnO2 sensor was further utilized for recycling performance to get the firm results of sensitivity in four turns with period of 15 days.

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Preparation, characterization and dechlorination property of nano Pd-Ni/γ-Al2O3 bimetallic catalyst

Functional Materials Letters ◽

10.1142/s1793604719510032 ◽

2019 ◽

Vol 12 (06) ◽

pp. 1951003 ◽

Cited By ~ 1

Author(s):

Yu Zhang ◽

Yiyang Wang ◽

Yalong Liao ◽

Muyuan Guo ◽

Gongchu Shi

Keyword(s):

Photoelectron Spectroscopy ◽

Inductively Coupled Plasma ◽

Bimetallic Catalyst ◽

Average Particle Size ◽

Nitrogen Adsorption ◽

Precipitation Method ◽

Emission Spectrometry ◽

Average Particle ◽

Plasma Atomic Emission Spectrometry ◽

X Ray

Nano Pd-Ni/[Formula: see text]-Al2O3 bimetallic catalyst was prepared by chemical precipitation method enhanced with ultrasonic wave. The influence of dosage of dispersant, ultrasonic intensity and mass ratio of Pd to Ni on the dechlorination property of the catalyst obtained was investigated in detail. The appearance morphology, composition and structure of the catalysts prepared were characterized with X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption, while the specific surface area was determined using the Brunauer–Emmett–Teller (BET) isotherm and the chemical composition of active gradients was tested with inductively coupled plasma-atomic emission spectrometry (ICP-AES). Results indicate that the nano Pd-Ni/[Formula: see text]-Al2O3 bimetallic catalyst prepared has uniform distribution of active ingredients with an average particle size of 4.91[Formula: see text]nm, and the chlorine content of shellac dechlorinated with the catalyst obtained is 0.34[Formula: see text]wt.% which is lower than that reported in the literature, meaning the perfect dechlorination property of the catalyst.

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Microwave Assisted Preparation of YAG and Yb:YAG Transparent Ceramic Nanopowders for Laser Crystal

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.697.76 ◽

2016 ◽

Vol 697 ◽

pp. 76-79 ◽

Cited By ~ 1

Author(s):

Wei Si ◽

Cang Xiong ◽

Yi Wen Jiang ◽

Zhi Feng Xing ◽

Wei Pan

Keyword(s):

Microwave Radiation ◽

Laser Crystal ◽

Radiation Power ◽

Average Particle Size ◽

Thermo Gravimetric Analysis ◽

Transparent Ceramic ◽

Precipitation Method ◽

Average Particle ◽

Gravimetric Analysis ◽

Microwave Assisted

YAG and Yb:YAG transparent ceramic nanopowders for laser crystal were synthesized by microwave-assisted alkoxide hydrolysis precipitation method. The YAG and Yb:YAG nanopowders were characterized by differential thermal analysis and thermo gravimetric analysis (DTA-TG), infrared spectrum (IR), X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and photoluminescence (PL) spectrum. The results show that the crystallizing temperature of the precursor of YAG and Yb:YAG is about 930 °C. The pure phase YAG and Yb:YAG nanopowders can be obtained at microwave radiation power of 385 W, microwave radiation time of 30 min and sintering temperature of 1100 °C. The average particle size of YAG is about 120 nm. Yb:YAG is uniform sphere and the average sizes is about 100 nm. The intensity of luminescence of Yb:YAG nanopowders decreased with the increasing of microware time. The maximum luminous intensity of the Yb:YAG nanopowders can be obtained when the microwave radiation is 30 min.

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Synthesis of Cu2ZnSnS4 (CZTS) Ink by an Easy Hydrothermal Method

10.21203/rs.3.rs-294208/v1 ◽

2021 ◽

Author(s):

Mahnaz Karbassi ◽

Saeid Baghshahi ◽

Nastaran Riahi-Noori ◽

Roozbeh Siavash Moakhar

Keyword(s):

Copper Acetate ◽

Average Particle Size ◽

Thermo Gravimetric Analysis ◽

Soda Lime ◽

Soda Lime Glass ◽

Average Particle ◽

Gravimetric Analysis ◽

Tin Chloride ◽

Vis Spectroscopy ◽

Czts Nanoparticles

Abstract The quadrilateral p-type semiconductor Cu2ZnSnS4 (CZTS) with a direct bandgap of 1.4 to 1.5 eV and a high absorption coefficient in the visible light range, is considered an excellent absorbent layer in the production of solar cells. The application of Cu2ZnSnS4 film absorbent materials is promising in the field of low-cost solar cell production. In this paper, a simple, efficient, controllable, and inexpensive solvothermal method is used to make the CZTS nanoparticles from zinc acetate, copper acetate, tin chloride, thiourea, and hexadecyl amine solvent. The ink was prepared from the CZTS powder and applied by the doctor Blade technique on soda-lime glass. The X-ray diffraction (XRD) and Raman spectroscopy analysis showed that the CZTS synthesis nanoparticles had a pure Kesterite structure. The thermo-gravimetric analysis showed about 12% of the loss weight of CZTS nanoparticles using field emission scanning electron microscopy, energy dispersive spectroscopy, dynamic light scattering, and zeta potential indicated that the synthesized nanoparticles had a strong absorption in the range of 125–477 nm with an average particle size of 300 nm and plate shape. The energy bandgap of CZTS nanoparticles was measured to be 1.49 eV using UV-Vis spectroscopy.

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Designer Synthesis of Ultra-Fine Fe-LTL Zeolite Nanocrystals

Crystals ◽

10.3390/cryst10090813 ◽

2020 ◽

Vol 10 (9) ◽

pp. 813

Author(s):

Fen Zhang ◽

Yunhong Luo ◽

Lei Chen ◽

Wei Chen ◽

Yin Hu ◽

...

Keyword(s):

Surface Area ◽

Inductively Coupled Plasma ◽

Active Sites ◽

External Surface ◽

Average Particle Size ◽

Average Particle ◽

External Surface Area ◽

Synthesis Conditions ◽

Diffusion Pathway ◽

Vis Spectroscopy

Nanosized zeolites with larger external surface area and decreased diffusion pathway provide many potential opportunities in adsorption, diffusion, and catalytic applications. Herein, we report a designer synthesis of ultra-fine Fe-LTL zeolite nanocrystals under very mild synthesis conditions. We prepared Fe-LTL zeolite nanocrystals synthesized using L precursor. The precursor is aging at room temperature to obtain zeolite L nuclei. In order to investigate more details of Fe-LTL zeolite nanocrystals, various characterizations including X-ray diffraction (XRD), inductively coupled plasma (ICP), diffuse reflectance ultraviolet-visible (UV-Vis) spectroscopy, confirm the tetrahedral Fe3+ species in the zeolite framework. Besides, scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), dynamic light scattering (DLS) indicate that the average particle size of Fe-LTL zeolite crystals is approximately 30 nm. Thus, ultra-fine Fe-LTL zeolite with large external surface area and shorter diffusion pathway to the active sites might have great potential in the near future.

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Synthesis and Characterization of CeO2/CuO Nanocomposites for Photocatalytic Degradation of Methylene Blue in Visible Light

Coatings ◽

10.3390/coatings11030305 ◽

2021 ◽

Vol 11 (3) ◽

pp. 305

Author(s):

Alia Raees ◽

Muhammad Asghar Jamal ◽

Ikram Ahmed ◽

Mika Silanpaa ◽

Tahani Saad Algarni

Keyword(s):

Methylene Blue ◽

Visible Light ◽

Organic Pollutant ◽

Average Particle Size ◽

Environmental Benefits ◽

Precipitation Method ◽

Polluted Water ◽

Average Particle ◽

Industrial Wastewaters ◽

Vis Spectroscopy

Removal of hazardous organic dyes from polluted water bodies requires the introduction of strong adsorbents and photocatalysts to industrial wastewaters. Herein, photocatalytic CeO2 nanoparticles and CeO2/CuO nanocomposite were synthesized following a co-precipitation method for low cost elution of methylene blue (MB) from water. The crystallinity and surface structure of the as-prepared materials have been analyzed using characterization techniques including X-ray powder diffraction (XRPD), field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS), ultra-violet visible spectroscopy (UV–Vis), and Fourier-transform infrared spectroscopy (FTIR). The average particle size of both the nano scaled samples were approximately 20–30 nm. The photocatalytic properties of CeO2/CuO were investigated under visible light against methylene blue (MB). The results showed 91% photodegradation of MB organic pollutant in 3 h as monitored by UV–Vis spectroscopy. Absorbance peaks appeared at around 670 nm corresponding to degradation of MB. Such output displayed the effectiveness of Ce nanocomposites for environmental benefits. Hence, CeO2/CuO nanocomposite could be useful for treatment of industrial wastewaters by removing hazardous MB dye.

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Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽

10.1557/adv.2020.370 ◽

2020 ◽

Vol 5 (57-58) ◽

pp. 2961-2972

Author(s):

P.C. Meléndez-González ◽

E. Garza-Duran ◽

J.C. Martínez-Loyola ◽

P. Quintana-Owen ◽

I.L. Alonso-Lemus ◽

...

Keyword(s):

Catalytic Activity ◽

Anion Exchange ◽

Average Particle Size ◽

Synthesis Method ◽

Alkaline Media ◽

High Catalytic Activity ◽

Average Particle ◽

Carbon Spheres ◽

Hollow Carbon ◽

Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

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Enhanced oral bioavailability of nisoldipine-piperine-loaded poly-lactic-co-glycolic acid nanoparticles

Nanotechnology Reviews ◽

10.1515/ntrev-2017-0151 ◽

2017 ◽

Vol 6 (6) ◽

pp. 517-526 ◽

Cited By ~ 3

Author(s):

Permender Rathee ◽

Anjoo Kamboj ◽

Shabir Sidhu

Keyword(s):

Oral Bioavailability ◽

Drug Loading ◽

Average Particle Size ◽

Entrapment Efficiency ◽

Pharmacokinetic Interaction ◽

Precipitation Method ◽

Pharmacokinetic Studies ◽

Average Particle

AbstractBackground:Piperine helps in the improvement of bioavailability through pharmacokinetic interaction by modulating metabolism when administered with other drugs. Nisoldipine is a substrate for cytochrome P4503A4 enzymes. The study was undertaken to assess the influence of piperine on the pharmacokinetics and pharmacodynamics of nisoldipine nanoparticles in rats.Methods:Optimization studies of nanoparticles were performed using Taguchi L9 orthogonal array, and the nanoparticles were formulated by the precipitation method. The influence of piperine and nanoparticles was evaluated by means of in vivo kinetic and dynamic studies by oral administration in rats.Results:The entrapment efficiency, drug loading, ζ potential, and average particle size of optimized nisoldipine-piperine nanoparticles was 89.77±1.06%, 13.6±0.56%, −26.5 mV, and 132±7.21 nm, respectively. The in vitro release in 0.1 n HCl and 6.8 pH phosphate buffer was 96.9±0.48% and 98.3±0.26%, respectively. Pharmacokinetic studies showed a 4.9-fold increase in oral bioavailability and a >28.376±1.32% reduction in systemic blood pressure by using nanoparticles as compared to control (nisoldipine suspension) in Wistar rats.Conclusion:The results revealed that piperine being an inhibitor of cytochrome P4503A4 enzymes enhanced the bioavailability of nisoldipine by 4.9-fold in nanoparticles.

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Preparation and characterization of domperidone nanoparticles for dissolution improvement

Iraqi Journal of Pharmaceutical Sciences ( P-ISSN 1683 - 3597 E-ISSN 2521 - 3512) ◽

10.31351/vol27iss1pp39-52 ◽

2018 ◽

Vol 27 (1) ◽

pp. 39-52

Author(s):

Mohammed Sabar Al-lami ◽

Malath H. Oudah ◽

Firas A. Rahi

Keyword(s):

Particle Size ◽

Average Particle Size ◽

In Vitro Release ◽

Methyl Cellulose ◽

Precipitation Method ◽

Average Particle ◽

Antisolvent Precipitation ◽

Stirring Time

This study was carried out to prepare and characterize domperidone nanoparticles to enhance solubility and the release rate. Domperidone is practically insoluble in water and has low and an erratic bioavailability range from 13%-17%. The domperidone nanoparticles were prepared by solvent/antisolvent precipitation method at different polymer:drug ratios of 1:1 and 2:1 using different polymers and grades of poly vinyl pyrolidone, hydroxy propyl methyl cellulose and sodium carboxymethyl cellulose as stabilizers. The effect of polymer type, ratio of polymer:drug, solvent:antisolvent ratio, stirring rate and stirring time on the particle size, were investigated and found to have a significant (p? 0.05) effect on particle size. The best formula was obtained with lowest average particle size of 84.05. This formula was studied for compatibility by FTIR and DSC, surface morphology by FESEM and crystalline state by XRPD. Then domperidone nanoparticles were formulated into a simple capsule dosage form in order to study of the in vitro release of drug from nanoparticles in comparison raw drug and mixture of polymer:drug ratios of 2:1. The release of domperidone from best formula was highly improved with a significant (p? 0.05) increase.

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Green bio-inspired synthesis, characterization and activity of silver nanoparticle forms of Centaurea virgata Lam. and the isolated flavonoid eupatorin

Green Processing and Synthesis ◽

10.1515/gps-2017-0027 ◽

2018 ◽

Vol 7 (4) ◽

pp. 372-379 ◽

Cited By ~ 2

Author(s):

Burcu Sümer Tüzün ◽

Judit Hohmann ◽

Bijen Kivcak

Keyword(s):

Electron Microscopy ◽

Zeta Potential ◽

Synthesis Method ◽

Gravimetric Analysis ◽

X Ray Diffraction ◽

Characteristic Absorption Band ◽

X Ray ◽

Vis Spectroscopy ◽

Diffraction Patterns ◽

Isolated Compound

AbstractA green synthesis method of silver nanoparticles (AgNPs) usingCentaurea virgataLam. extract and the isolated compound eupatorin was investigated in this study. Ultraviolet-visible (UV-Vis) spectroscopy, Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM)/energy-dispersive X-ray (EDX) spectroscopy, thermal gravimetric analysis, X-ray diffraction analysis and zeta potential were used for characterization of AgNPs. The UV-Vis spectrum exhibited a characteristic absorption band at 420 nm for monodisperse nanoparticles. FTIR measurements also proved the formation. X-ray diffraction patterns showed peaks at (110) and (112), which are characteristic for hexagonal crystals and also showed peaks at (111), (200) and (240), which are characteristic for orthorhombic crystals. The TEM images of AgNPs show that the morphology of AgNPs was predominantly spherical. Obtained AgNPs were highly stable according to the zeta potential values. The nitric oxide scavenging activity, which is also related to anticancer activity, of AgNPs was evaluated. It can be concluded thatC. virgataLam. extract and eupatorin can be used as a reducing agent for potential antioxidant AgNP formation.

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