scholarly journals Synthesis of the platinum particle with the pH variation for the particle size control

2021 ◽  
Vol 2145 (1) ◽  
pp. 012038
Author(s):  
P Thongnopkun ◽  
W Kitprapot
Keyword(s):  
Particle Size ◽  
Chemical Reduction ◽  
Intrinsic Value ◽  
Size Control ◽  
Spherical Shape ◽  
Platinum Particle ◽  
Particle Sizes ◽  
Sem Images ◽  
Ph Variation ◽  
Reduction Methods

Abstract Platinum is a precious metal widely used in the jewelry industry due to its property and intrinsic value. The different particle sizes of platinum can be applied in various applications, especially for jewelry production. In the present article, submicron, and nano-sized platinum particle sizes were synthesized through simple chemical reduction methods and the effect of pH variation was revealed. The scanning electron microscope (SEM) images showed that the pH variations give rise to significant changes of the obtained particle size. The size of platinum particle was decreased from submicron to nanoscale while the pH was increased. The UV-Vis spectra indicated the maximum absorption at 220 nm confirming the spherical shape of the platinum particle. The FT-IR spectroscopy was used to analyze the residuals from the synthesis. The result showed that there is no indication of residual in the synthesized particle. Additionally, this synthesis can provide stability in terms of size and shape, as well as high production yield.

Preparation and Characterization of Bulk and Supported NiB Amorphous Alloy Catalysts with Different Particle Sizes

2007 ◽  
Vol 121-123 ◽  
pp. 637-640
Author(s):  
Lai Jun Wang ◽  
Wei Li ◽  
M.H. Zhang ◽  
K.Y. Tao
Keyword(s):  
Amorphous Alloy ◽  
Electroless Plating ◽  
Chemical Reduction ◽  
Reaction System ◽  
Catalytic Performance ◽  
Ni Catalyst ◽  
Particle Sizes ◽  
Raney Ni ◽  
Reduction Methods ◽  
Alloy Catalysts

A series of bulk and supported NiB amorphous alloy catalysts with different particle sizes were prepared by different chemical reduction methods. By adding a certain volume of NH3 to the reaction system and adjusting the reaction temperature, respectively, the velocity of the reaction between Ni2+ and BH4 - could be controlled and the NiB alloys with particle sizes ranging from 10 to 400nm were obtained. A novel method to prepare the supported NiB catalyst, the powder electroless plating method was also studied. The bulk and supported NiB catalysts were characterized by XRD, ICP and TEM. Hydrogenation of sulfolene was selected as the probe reaction to investigate their catalytic performance. The results revealed that the NiB/MgO prepared by Ag inducing electroless plating showed much higher catalytic activity than Raney Ni catalyst, and the powder electroless plating was a promising method to prepare the supported NiB amorphous alloy catalysts.

scholarly journals Effect of Nanosized Colloidal Copper on Cotton Fabric

2010 ◽  
Vol 5 (3) ◽  
pp. 155892501000500 ◽  
Author(s):  
D.P. Chattopadhyay ◽  
B.H. Patel
Keyword(s):  
Particle Size ◽  
Cotton Fabric ◽  
Colloidal Solution ◽  
Chemical Reduction ◽  
Average Particle Size ◽  
Particle Size Analysis ◽  
Nano Particles ◽  
Size Analysis ◽  
Average Particle ◽  
Sem Images

This research deals with the synthesis of nanosized copper as colloidal solution and its application to cotton fabric. Copper nano colloids were prepared by chemical reduction of copper salt using sodium borohydride as reducing agent in presence of tri-sodium citrate. The size and size distribution of the particles were examined by particle size analyzer and the morphology of the synthesized particles was examined by SEM and AFM techniques. X-ray fluorescence spectroscopy detected the presence of copper in the treated fabric. The results of particle size analysis showed that the average particle size varied from 60 nm to 100 nm. The nano copper treated cotton was subjected to soil burial test for the assessment of its resistance towards microbial attack. SEM images of treated fabric indicate copper nano particles are well dispersed on the surface of the specimens. The treatments of nano copper colloidal solution on cotton not only improve its antimicrobial efficiency but also influenced the tensile strength of the fabric sample positively. The treatment was found to enhance the color depth and fastness properties of direct dyed cotton fabric samples.

scholarly journals DEVELOPMENT OF SODIUM ALGINATE COATED NANOPARTICLES OF METRONIDAZOLE FOR THE TREATMENT OF PERIODONTITIS

2019 ◽  
pp. 105-110 ◽  
Author(s):  
MUKUL SINGH ◽  
GAURAV JAIN
Keyword(s):  
Particle Size ◽  
Sodium Alginate ◽  
Biological Membrane ◽  
Spherical Shape ◽  
Prolonged Treatment ◽  
Prolonged Action ◽  
Sem Images ◽  
Mean Particle Size ◽  
Coated Nanoparticles ◽  
Acceptable Range

Objective: The present study was aimed to develop metronidazole (MNZ) loaded poly lactic-co-glycolic acid (PLGA) based mucoadhesive nanoparticles (NPs) in prolonged treatment in periodontitis. Methods: Nanoparticles were prepared by using single (SE) and double (DE) emulsion method to determine the suitability of methods. Prepared NPs were evaluated for surface morpholgy, mean particle size, polydispersity index, zeta potential, mucoadhesion ability and invitro-drug release, Results: SEM images confirmed that NPs were of spherical shape and smooth surface. Mean particle size, of MNZ loaded NPs were found 583.28±18.22 and 872.72±63.18 prepared by SE and DE method. Similarly, polidispersity index (0.68±0.1 and 0.83±0.06) and zeta potention (-33.29±0.7 and-31.28.0.6) was found in acceptable range. Prepared NPs were surface treated with Sodium alginate (SA) to increase mucoadhesive property. It was observe that particles remain adhere till 24 hr with biological membrane. Prepared NPs allow release of MNZ upto 24 h in sustained manner. Conclusion: This study confirms that the prepared MNZ loaded NPs may be used as an better alternate with addition application such as prolonged action thus improved patient compliance.

scholarly journals Preparation and Characterization of Alumina Nanoparticles in Deionized Water Using Laser Ablation Technique

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Veeradate Piriyawong ◽  
Voranuch Thongpool ◽  
Piyapong Asanithi ◽  
Pichet Limsuwan
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Absorption Spectra ◽  
Laser Energy ◽  
Spherical Shape ◽  
Deionized Water ◽  
Alumina Nanoparticles ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Xrd Patterns

Al2O3nanoparticles were synthesized using laser ablation of an aluminum (Al) target in deionized water. Nd:YAG laser, emitted the light at a wavelength of 1064 nm, was used as a light source. The laser ablation was carried out at different energies of 1, 3, and 5 J. The structure of ablated Al particles suspended in deionized water was investigated using X-ray diffraction (XRD). The XRD patterns revealed that the ablated Al particles transformed intoγ-Al2O3. The morphology of nanoparticles was investigated by field emission scanning electron microscopy (FE-SEM). The FE-SEM images showed that most of the nanoparticles obtained from all the ablated laser energies have spherical shape with a particle size of less than 100 nm. Furthermore, it was observed that the particle size increased with increasing the laser energy. The absorption spectra of Al2O3nanoparticles suspended in deionized water were recorded at room temperature using UV-visible spectroscopy. The absorption spectra show a strong peak at 210 nmarising from the presence of Al2O3nanoparticles. The results on absorption spectra are in good agreement with those investigated by XRD which confirmed the formation of Al2O3nanoparticles during the laser ablation of Al target in deionized water.

scholarly journals The Influence of the Gold Particle Size on the Catalytic Oxidation of 5-(Hydroxymethyl)furfural

Catalysts ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 342 ◽  
Author(s):  
Oliver Schade ◽  
Paolo Dolcet ◽  
Alexei Nefedov ◽  
Xiaohui Huang ◽  
Erisa Saraçi ◽  
...  
Keyword(s):  
Particle Size ◽  
Functional Groups ◽  
Chemical Reduction ◽  
Large Fraction ◽  
Particle Sizes ◽  
Mean Particle Size ◽  
Hydroxymethyl Furfural ◽  
Highly Active ◽  
Surface Steps ◽  
Aldehyde Oxidation

For the production of chemicals from biomass, new selective processes are required. The selective oxidation of 5-(Hydroxymethyl)furfural (HMF), a promising platform molecule in fine chemistry, to 2,5-furandicarboxylic acid (FDCA) is considered a promising approach and requires the oxidation of two functional groups. In this study, Au/ZrO2 catalysts with different mean particle sizes were prepared by a chemical reduction method using tetrakis(hydroxymethyl)phosphonium chloride (THPC) and tested in HMF oxidation. The catalyst with the smallest mean particle size (2.1 nm) and the narrowest particle size distribution was highly active in the oxidation of the aldehyde moiety of HMF, but less active in alcohol oxidation. On the other hand, increased activity in FDCA synthesis up to 92% yield was observed over catalysts with a larger mean particle size (2.7 nm), which had a large fraction of small and some larger particles. A decreasing FDCA yield over the catalyst with the largest mean particle size (2.9 nm) indicates that the oxidation of both functional groups require different particle sizes and hint at the presence of an optimal particle size for both oxidation steps. The activity of Au particles seems to be influenced by surface steps and H bonding strength, the latter particularly in aldehyde oxidation. Therefore, the presence of both small and some larger Au particles seem to give catalysts with the highest catalytic activity.

Synthesis and Size-Control of Monoclinic Crystalline Phase VO2 Powders

2016 ◽  
Vol 847 ◽  
pp. 190-193
Author(s):  
Min Huang ◽  
Kai Wang ◽  
Yue Huang ◽  
Zhong Hua Zhou ◽  
Shirley Shen
Keyword(s):  
Particle Size ◽  
Annealing Temperature ◽  
Size Control ◽  
Particle Sizes ◽  
Preparation Methods ◽  
Post Annealing ◽  
Thermal Phase Transition ◽  
Thermal Phase ◽  
Annealing Method ◽  
Size Controlling

The exploration of efficient preparation methods of VO2(M) powders, especially the controls of particle sizes, is a challenge. In this article VO2(M) powders were prepared by a liquid phase precipitation and post annealing method. The structure and morphology of the VO2(M) powders were characterized by XRD and SEM. The effects of annealing temperature and the amounts of additive SiO2 aerogels on the particle size controlling were studied .The thermal phase transition properties were characterized by DSC analysis. The results reveal that the transformation of crystal phases from V6O13 to VO2(M) takes place in the annealing process and the additive of SiO2 aerogels can control the particle size and promote the particle size to be smaller effectively.

Particle Size Characterisation of Tin Oxide (SnO2) Precipitated by Various Techniques: Consistency of Data

2007 ◽  
Vol 561-565 ◽  
pp. 2155-2158
Author(s):  
H. Taib ◽  
Charles C. Sorrell
Keyword(s):  
Particle Size ◽  
Light Scattering ◽  
Tin Oxide ◽  
Spherical Shape ◽  
Particle Sizes ◽  
Size Distributions ◽  
Particle Size Distributions ◽  
Oxide Powders ◽  
Spherical Agglomerates ◽  
The Individual

The particle size distributions of tin oxide powders produced from the calcining of precipitated tin oxalate were determined by four methods, these being two static and two dynamic light scattering techniques. Although the individual particle sizes were ~ 75 nm, all of the powders were heavily agglomerated as plates. The non-spherical shape resulted in the following interpretational problems: • None of the measurements was in agreement with any others. • There were very significant disagreements between the two light scattering methods. • The particle size distributions were multimodal. • The main peaks in the distribution curves, which were used to calculate the averages and standard deviations, were not Gaussian. The main uncertainty with these data is associated with the non-spherical agglomerates, which result in the multimodal size distributions. These probably were caused by variable-sized but large platy agglomerates.

Mechanochemical Synthesis and Electrochemical Performances of Li4Ti5O12 Anode Materials for Lithium Ion Batteries

2012 ◽  
Vol 512-515 ◽  
pp. 1660-1663 ◽  
Author(s):  
Yang Li ◽  
Hua Qing Xie ◽  
Jing Li ◽  
Ji Feng Wang
Keyword(s):  
Particle Size ◽  
Anode Materials ◽  
Particle Distribution ◽  
Rate Capability ◽  
Lithium Ion ◽  
Electrochemical Performances ◽  
Particle Sizes ◽  
Sem Images ◽  
Sintered Temperature ◽  
Uniform Particle Size

Li4Ti5O12anode materials have been synthesized via mechnochemical method and subsequent sintering with nanosized TiO2and Li2CO3as reagents. XRD measurements indicated that well crystallized Li4Ti5O12could be obtained above 800 °C. The sizes of Li4Ti5O12particles increased with sintered temperature augmenting. Various particle distribution and particle sizes are presented in SEM images. In electrochemical investigations, Li4Ti5O12sintered at 800 °C presented excellent discharge-charge performances and rate capability. The discharge capacity could achieve 168 mAh/g and 140 mAh/g at 0.1 C and 1.0 C rate, respectively, which was attributed to its uniform particle size distribution and relatively small particle size.

Determination of clay mineral aspect ratios from conductometric titrations

Clay Minerals ◽  
2014 ◽  
Vol 49 (1) ◽  
pp. 17-26 ◽  
Author(s):  
C. Weber ◽  
M. Heuser ◽  
G. Mertens ◽  
H. Stanjek
Keyword(s):  
Particle Size ◽  
Spherical Shape ◽  
Particle Sizes ◽  
Particle Size Distributions ◽  
Laser Scattering ◽  
Clay Particles ◽  
Aspect Ratios ◽  
Particle Size Determination ◽  
Physical Principles

AbstractIt has been established that disagreements between different methods of particle size determination of clay minerals can be ascribed to the non-spherical shape of the clay particles. However, by having aspect ratios available, particle sizes can be harmonized. One frequently used approach to obtain aspect ratios is to compare particle sizes originating from at least two devices operating on the basis of different physical principles. In this contribution aspect ratios of nine kaolinite-dominated and one dickite-dominated sample were determined by conductometric titrations. The aspect ratios obtained were then successfully used to correlate particle size distributions from dynamic laser scattering and acoustic spectroscopy.

scholarly journals Plasma-Assisted Synthesis of Multicomponent Nanoparticles Containing Carbon, Tungsten Carbide and Silver as Multifunctional Filler for Polylactic Acid Composite Films

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 991
Author(s):  
Nichapat Boonyeun ◽  
Ratana Rujiravanit ◽  
Nagahiro Saito
Keyword(s):  
Tungsten Carbide ◽  
Polylactic Acid ◽  
Ag Nanoparticles ◽  
Composite Films ◽  
Spherical Shape ◽  
Antibacterial Activities ◽  
Atomic Ratio ◽  
Average Particle ◽  
Particle Sizes ◽  
Sem Images

Multicomponent nanoparticles containing carbon, tungsten carbide and silver (carbon-WC-Ag nanoparticles) were simply synthesized via in-liquid electrical discharge plasma, the so-called solution plasma process, by using tungsten electrodes immersed in palm oil containing droplets of AgNO3 solution as carbon and silver precursors, respectively. The atomic ratio of carbon:W:Ag in carbon-WC-Ag nanoparticles was 20:1:3. FE-SEM images revealed that the synthesized carbon-WC-Ag nanoparticles with particle sizes in the range of 20–400 nm had a spherical shape with a bumpy surface. TEM images of carbon-WC-Ag nanoparticles showed that tungsten carbide nanoparticles (WCNPs) and silver nanoparticles (AgNPs) with average particle sizes of 3.46 nm and 72.74 nm, respectively, were dispersed in amorphous carbon. The carbon-WC-Ag nanoparticles were used as multifunctional fillers for the preparation of polylactic acid (PLA) composite films, i.e., PLA/carbon-WC-Ag, by solution casting. Interestingly, the coexistence of WCNPs and AgNPs in carbon-WC-Ag nanoparticles provided a benefit for the co-nucleation ability of WCNPs and AgNPs, resulting in enhanced crystallization of PLA, as evidenced by the reduction in the cold crystallization temperature of PLA. At the low content of 1.23 wt% carbon-WC-Ag nanoparticles, the Young’s modulus and tensile strength of PLA/carbon-WC-Ag composite films were increased to 25.12% and 46.08%, respectively. Moreover, the PLA/carbon-WC-Ag composite films possessed antibacterial activities.

Sign in / Sign up

Export Citation Format

Share Document