scholarly journals Averrhoa carambola: A Renewable Source of Oxalic Acid for the Facile and Green Synthesis of Divalent Metal (Fe, Co, Ni, Zn, and Cu) Oxalates and Oxide Nanoparticles

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Nguimezong Nguefack Marius Borel ◽  
Josepha Foba-Tendo ◽  
Divine Mbom Yufanyi ◽  
Ekane Peter Etape ◽  
Jude Namanga Eko ◽  
...  
Keyword(s):  
Oxalic Acid ◽  
Metal Oxide Nanoparticles ◽  
Environmentally Benign ◽  
Effect Of Temperature ◽  
Special Treatment ◽  
Oxide Nanoparticles ◽  
Synthetic Approach ◽  
X Ray Diffraction ◽  
Decomposition Products ◽  
Averrhoa Carambola

A green, simple, and environmentally benign synthetic approach has been utilised to obtain some bivalent metal oxalates from Averrhoa carambola juice extract, without any purification or special treatment of the juice. The main acid components (oxalic acid and ascorbic acid) of the juice were identified by HPLC technique. The effect of temperature on the purity of the product has been investigated. The as-synthesized metal oxalates were thermally decomposed at low temperatures to their respective metal oxide nanoparticles. The metal oxalates and their respective thermal decomposition products were characterized by Fourier Transform Infrared spectroscopy, X-ray diffraction analysis, and thermogravimetry.

scholarly journals Impact of Nanosized CuO Insertion on Structural and Mechanical Properties of PVA: HPMC Based Polymer Blend Nanocomposites

2021 ◽  
Vol 33 (10) ◽  
pp. 2287-2292
Author(s):  
K. Vijayashree ◽  
K. Sheshappa Rai
Keyword(s):  
Mechanical Properties ◽  
Metal Oxide Nanoparticles ◽  
Hydroxypropyl Methylcellulose ◽  
Cuo Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Uv Visible ◽  
Blend Nanocomposites ◽  
Scanning Electron

Insertion of metal-oxide nanoparticles to polymers stipulate the modification of physical properties of polymers over and above the accomplishment of new features in the polymer matrix. In the current study, an attempt was made to disperse the CuO nanoparticles in the polyvinyl alcohol and hydroxypropyl methylcellulose (HPMC) blend to investigate the structural, mechanical and optical properties of the nanocomposite. Blend was prepared in different ratios using PVA and HPMC, viz. 25:50, 50:50 and 75:25 wt%. The CuO nanoparticles were added to the 75:25 PVA:HPMC blend in different percentage like 0.5,1 and 1.5%. The polymer with and without CuO incorporation were subjected to X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, UV-visible spectral analyses and mechanical strength, etc. The results revealed that the incorporation of the CuO nanoparticles enhanced the structural and mechanical properties of the polymer by forming successful nanocomposite.

Fabrication of nanohybrids assisted by protein-based materials for catalytic applications

2020 ◽  
Vol 10 (11) ◽  
pp. 3515-3531 ◽  
Author(s):  
Mingyue Liu ◽  
Tao Yu ◽  
Renliang Huang ◽  
Wei Qi ◽  
Zhimin He ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Environmentally Benign ◽  
Oxide Nanoparticles ◽  
P Protein ◽  
Catalytic Applications

Protein units and architectures were applied as supports in the synthesis of metal and metal oxide nanoparticles for environmentally benign catalytic applications.

scholarly journals Synthesis, Characterization, Modeling and Anti-Bacterial Properties of Peanut-Shaped ZnO Nano-Bunches

Nano Hybrids ◽  
2013 ◽  
Vol 4 ◽  
pp. 61-85
Author(s):  
Mohd Farhan Khan ◽  
Akhter H. Ansari ◽  
M. Hameedullah ◽  
M.B. Lohani ◽  
Mohammad Mezbaul Alam ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Zinc Acetate Dihydrate ◽  
Metal Oxide Nanoparticles ◽  
Effect Of Temperature ◽  
Oxide Nanoparticles ◽  
Zno Nps ◽  
Vis Spectroscopy ◽  
Molar Solution ◽  
Relationship Of ◽  
The Impact

Since few decades, the fabrications of metal oxide nanoparticles (MO-Nps) as well as their uses in various segments have been increased manifolds. An easy effort to produce an important category of MO-Nps as Zinc oxide nanoparticles (ZnO-Nps), with the assistance of mechano-solution method at various low temperatures, introducing Zinc acetate dihydrate and Sodium hydroxide into the molar solution of C19H42NBr complex (Cetrimonium bromide, CTAB) for much less than an hour was projected. The impact of this method performed at two different ranges of process temperatures was studied and the magnitude of the ZnO-Nps (like particle size, morphology and L/D dimensions) has been reported. On the top of this, the morphological study of these Nps has been presented. The characterization of the synthesized Nps was carried out with the help of SEM with EDS, XRD, UV-Vis spectroscopy. The scanning electron microscopy has revealed the synthesis of peanut-shaped ZnO nanobunches (NBs) at two different ranges of temperature. An overall viable growth of the solitary nanoparticles constituting of ZnO-NBs has also been put forth. Hence, the effect of temperature on C19H42NBr complex (stabilizer) has been reported. In addition, a postulated model depicting the relationship of the temperature effect on the process parameters of ZnO-NBs has also been floated. The Gram +ve bacteria, Bacillus subtilis is a rod shaped bacteria which is commonly known as normal gut commensal in humans. Due to the emergence of anti-biotic resistant drugs, alternate medications are under primary considerations. A noteworthy experimentation was concerned with anti-bacterial activity of therapeutically viable Gram +ve bacteria, Bacillus subtilis and it was found that reported ZnO-NBs have become the promising entities for terminating the growth of these bacterias.

scholarly journals Synthetic versatility of nanoparticles: A new, rapid, one-pot, single-step synthetic approach to spherical mesoporous (metal) oxide nanoparticles using supercritical alcohols

2014 ◽  
Vol 86 (5) ◽  
pp. 785-800 ◽  
Author(s):  
Pengyu Wang ◽  
Kazuya Kobiro
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Single Step ◽  
Oxide Nanoparticles ◽  
Synthetic Approach ◽  
Organic Additives ◽  
Step Method ◽  
One Pot ◽  
Mesoporous Metal ◽  
Mesoporous Metal Oxide

AbstractA simple, rapid (10 min), one-pot, single-step method for the preparation of solid and hollow spherical porous TiO2 nanoparticles with large surface areas (100–211 m2/g) was developed in supercritical alcohols using carboxylic acids as organic additives. The shell thickness of the hollow TiO2 nanoparticles (20–280 nm) was controlled by adjusting the heating rate (2.0–10.0 °C/min). The preparation of different spherical porous metal oxide nanoparticles, including CeO2, SiO2, TiO2, ZrO2, and ZnO, demonstrated the versatility of the synthetic approach. In addition, several rare earth-doped spherical mesoporous metal oxide nanoparticles, including CeO2:Er, CeO2:Er,Yb, ZrO2:Er, and TiO2:Er, which exhibit energy upconversion emission, were successfully prepared using this one-pot, single-step, supercritical methanol method. The obtained spherical mesoporous CeO2:Er and CeO2:Er,Yb nanoparticles emit green light upon excitation, even when irradiated with a low-power IR laser (980 nm, 10 mW) without calcination. Several other (metal) elements were also easily doped into spherical, mesoporous TiO2 nanoparticles, such as Eu, Ce, Yb, Fe, and N, using a similar procedure. Furthermore, the spherical mesoporous TiO2 nanoparticles were successfully applied as a new material for the transport of DNA via biolistic bombardment.

scholarly journals Structural and morphological tuning of Cu-based metal oxide nanoparticles by a facile chemical method and highly electrochemical sensing of sulphite

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Velayutham Sudha ◽  
Govindhasamy Murugadoss ◽  
Rangasamy Thangamuthu
Keyword(s):  
Crystal Structures ◽  
Chemical Method ◽  
Metal Oxide Nanoparticles ◽  
Modified Electrodes ◽  
Electrochemical Sensing ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
One Step

AbstractA facile one-step chemical method is introduced for the successful synthesis of Cu2O, CuO and CuNa2(OH)4 crystal structures and their electrochemical properties were also investigated. X-ray diffraction studies revealed that these copper-based oxide nanoparticles display different crystal structures such as cubic (Cu2O), monoclinic (CuO) and orthorhombic [CuNa2(OH)4]. The microstructural information of nanoparticles was investigated by transmission electron microscopy. It shows attractive morphologies of different orientation such as rod like structure, nanobeads and well-aligned uniform nanorod for Cu2O, CuO and CuNa2(OH)4, respectively. Electrochemical sensing of sulphite (SO32−) on these three copper-based oxide modified electrodes was investigated. Among the three different crystal structures, CuO shows promising electrocatalytic activity towards oxidation of sulphite. A linear variation in peak current was obtained for SO32− oxidation from 0.2 to 15 mM under the optimum experimental condition. The sensitivity and detection limit were in the order of 48.5 µA cm−2 mM−1 and 1.8 µM, respectively. Finally, practical utility of CuO modified electrode was demonstrated for the estimation of sulphite in commercial wine samples.

scholarly journals Green Synthesis of Iron Oxide Nanoparticle Using Coffee Seed Extract and Its Antibacterial Activity

2021 ◽  
Vol 17 (2) ◽  
pp. 19-29
Author(s):  
Yi Peng Teoh ◽  
◽  
Zhong Xian Ooi ◽  
Sim Siong Leong ◽  
Pao Tyon Ng ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Metal Oxide Nanoparticles ◽  
Single Step ◽  
Iron Oxide Nanoparticle ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Reduction Of Iron ◽  
Crystalline Property ◽  
Average Size ◽  
Coffee Seed

The discovery of reliable and green processes for metal oxide nanoparticles synthesis is particularly crucial and exhibits huge potential in various applications. Thus, in this paper, a fast, single step and environmental-friendly method to synthesize iron oxide nanoparticles (Fe2O3-NPs) by bio-reduction of iron salts Fe2+ and Fe3+ under the presence of coffee seeds (CS) aqueous extract was demonstrated. The characteristics of the synthesised Fe2O3-NPs were investigated by using X-ray diffraction (XRD) and ultraviolet-visible (UV-Vis) spectrophotometry techniques. The XRD result revealed that the Fe2O3-NPs produced display highly crystalline property with a cubic structure and the average size of the resulted particle is ranging from 23.2 nm to 37.5 nm. Additionally, the energy band gap (Eg) calculated also showed that maghemite (γ-Fe2O3) nanoparticles was successfully synthesised by using CS extract. The resulted nanoparticles are highly feasible in the inhibition of the growth of pathogenic microorganism.

Facial synthesis of hexagonal metal oxide nanoparticles for low temperature ammonia gas sensing applications

RSC Advances ◽  
2015 ◽  
Vol 5 (6) ◽  
pp. 4135-4142 ◽  
Author(s):  
Ishpal Rawal
Keyword(s):  
Gas Sensing ◽  
Metal Oxide Nanoparticles ◽  
Hydrothermal Process ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
Wurtzite Phase ◽  
Ammonia Gas ◽  
X Ray ◽  
Sensing Applications ◽  
Surfactant Assisted

A surfactant assisted facial hydrothermal process has been employed for the synthesis of rutile and wurtzite phase SnO2 and ZnO nanoparticles, respectively, confirmed by X-ray diffraction studies.

Effect of Metal Oxide Nanoparticles Addition on Physical Properties of Hydroxyapatite

2012 ◽  
Vol 506 ◽  
pp. 234-237
Author(s):  
N. Lertcumfu ◽  
P. Jarupoom ◽  
Kamonpan Pengpat ◽  
T. Tunkasiri ◽  
Gobwute Rujijanagul
Keyword(s):  
Grain Boundary ◽  
Metal Oxide ◽  
Physical Properties ◽  
Energy Dispersive Spectroscopy ◽  
Metal Oxide Nanoparticles ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ni Substitution ◽  
Tricalcium Phosphates

In the present study the effects of metal oxide nanoparticles addition on the microstructure, physical properties of the HA ceramics were investigated. Many techniques were used for the analysis. X-ray diffraction analysis revealed a co-exist phases between hydroxyapatite and tricalcium phosphate in the sintered samples. Addition of NiO resulted an increase in the lattice parameters of the tricalcium phosphates due to the bigger radii atom (Ni) substitution for the small radii atom (Ca). Energy dispersive spectroscopy suggested that most of NiO particles located at grain boundary, resulting in an improvement of hardness of the samples

scholarly journals From iron coordination compounds to metal oxide nanoparticles

2016 ◽  
Vol 7 ◽  
pp. 2074-2087 ◽  
Author(s):  
Mihail Iacob ◽  
Carmen Racles ◽  
Codrin Tugui ◽  
George Stiubianu ◽  
Adrian Bele ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Metal Oxide Nanoparticles ◽  
Mixed Valence ◽  
Iron Complex ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron

Various types, shapes and sizes of iron oxide nanoparticles were obtained depending on the nature of the precursor, preparation method and reaction conditions. The mixed valence trinuclear iron acetate, [Fe2 IIIFeIIO(CH3COO)6(H2O)3]·2H2O (FeAc1), μ3-oxo trinuclear iron(III) acetate, [Fe3O(CH3COO)6(H2O)3]NO3∙4H2O (FeAc2), iron furoate, [Fe3O(C4H3OCOO)6(CH3OH)3]NO3∙2CH3OH (FeF), iron chromium furoate, FeCr2O(C4H3OCOO)6(CH3OH)3]NO3∙2CH3OH (FeCrF), and an iron complex with an original macromolecular ligand (FePAZ) were used as precursors for the corresponding oxide nanoparticles. Five series of nanoparticle samples were prepared employing either a classical thermal pathway (i.e., thermal decomposition in solution, solvothermal method, dry thermal decomposition/calcination) or using a nonconventional energy source (i.e., microwave or ultrasonic treatment) to convert precursors into iron oxides. The resulting materials were structurally characterized by wide-angle X-ray diffraction and Fourier transform infrared, Raman, energy-dispersive X-ray, and X-ray fluorescence spectroscopies, as well as thermogravimetric analysis. The morphology was characterized by transmission electron microscopy, atomic force microscopy and dynamic light scattering. The parameters were varied within each route to fine tune the size and shape of the formed nanoparticles.

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