MnO, Co and Ni Nanoparticle Synthesis by Oleylamie and Oleic Acid

2021 ◽  
Vol 01 ◽  
Author(s):  
Wencai He ◽  
Yifang Qi ◽  
Uppalaiah Erugu ◽  
Jaiden Moore ◽  
Xianchun Zhu ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Reaction Time ◽  
Magnetic Measurements ◽  
Nanoparticle Synthesis ◽  
Starting Material ◽  
Synthesis Methods ◽  
Ni Nanoparticles ◽  
Experimental Conditions ◽  
Nanoparticle Growth ◽  
Pure Phase

Background: Magnetic nanoparticles are attracting much attention toward easy operation and size controlable synthesis methods. We develop a method to synthesize MnO, Co, CoO, and Ni nanoparticles by thermal decomposition of metal 2,4-pentanedionates in the presence of oleylamine (OLA), oleic acid (OA), and 1‐octadecene (ODE). Methods: Similar experimental conditions are used to prepare nanoparticles except for the metal starting materials (manganese 2,4-pentanedionate, nickel 2,4-pentanedionate, and cobalt 2,4-pentanedionate), leading to different products. For the manganese 2,4-pentanedionate starting material, MnO nanoparticles are always obtained as the reaction is controlled with different temperatures, precursor concentrations, ligand ratios, and reaction time. For the cobalt 2,4-pentanedionate starting material, only three experimental conditions can produce pure phase CoO and Co nanoparticles. For the nickel 2,4-pentanedionate starting material, only three experimental conditions lead to the production of pure phase Ni nanoparticles. Results: The nanoparticle sizes increase with the increase of reaction temperatures. It is observed that the reaction time affects nanoparticle growth. The nanoparticles are studied by XRD, TEM, and magnetic measurements. Conclusion: This work presents a facile method to prepare nanoparticles with different sizes, which provides a fundamental understanding of nanoparticle growth in solution.

scholarly journals Synthesis of Magnetic Mno, Co and Ni Nanoparticle by Oleylamie and Oleic Acid

2021 ◽  
Author(s):  
wencai he ◽  
Yifang Qi ◽  
Uppalaiah Erugu ◽  
Jaiden Moore ◽  
Xianchun Zhu ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Reaction Time ◽  
Magnetic Measurements ◽  
Ni Nanoparticles ◽  
Experimental Conditions ◽  
Nanoparticle Growth ◽  
Mixture Phase ◽  
Pure Phase ◽  
Different Temperatures ◽  
Nanoparticle Sizes

Abstract Magnetic MnO, Co, CoO, and Ni nanoparticles are synthesized by thermal decomposition of metal 2,4-pentanedionates in the presence of oleylamine (OLA), oleic acid (OA), and 1-octadecene (ODE). Similar experimental conditions are used to prepare nanoparticles except for the metal starting materials (manganese 2,4-pentanedionate, nickel 2,4-pentanedionate, and cobalt 2,4-pentanedionate). MnO nanoparticles are always obtained as the reaction is controlled with different temperatures, precursor concentrations, ligand ratios, and reaction time. Only three experimental conditions can produce pure phase CoO and Co nanoparticles. The same three experimental conditions lead to the production of pure phase Ni nanoparticles. Other experimental conditions produce mixture phase nanomaterials. The nanoparticle sizes increase with the increase of reaction temperatures. The influence of reaction precursor concentrations on the sizes of the nanoparticles is also studied. The ratio of ligand OLA to OA is used to control the reaction in terms of nanoparticle sizes. It is observed that the reaction time affects nanoparticle growth. The nanoparticles are studied by XRD, TEM, and magnetic measurements. This work presents a facile method to prepare nanoparticles with different sizes, which provides a fundamental understanding of nanoparticle growth in solution.

Metallic Nanoparticle Synthesis by Green Chemistry

2018 ◽  
Vol 11 (6) ◽  
pp. 4287-4294
Author(s):  
Anikate Sood ◽  
Shweta Agarwal
Keyword(s):  
Green Chemistry ◽  
Green Synthesis ◽  
Biomedical Research ◽  
Metallic Nanoparticles ◽  
Nanoparticle Synthesis ◽  
Synthesis Methods ◽  
Metallic Nanoparticle ◽  
Medical Field ◽  
Advantages And Disadvantages ◽  
Gold Silver

Nanotechnology is the most sought field in biomedical research. Metallic nanoparticles have wide applications in the medical field and have gained the attention of various researchers for advanced research for their application in pharmaceutical field. A variety of metallic nanoparticles like gold, silver, platinum, palladium, copper and zinc have been developed so far. There are different methods to synthesize metallic nanoparticles like chemical, physical, and green synthesis methods. Chemical and physical approaches suffer from certain drawbacks whereas green synthesis is emerging as a nontoxic and eco-friendly approach in production of metallic nanoparticles. Green synthesis is further divided into different approaches like synthesis via bacteria, fungi, algae, and plants. These approaches have their own advantages and disadvantages. In this article, we have described various metallic nanoparticles, different modes of green synthesis and brief description about different metabolites present in plant that act as reducing agents in green synthesis of metallic nanoparticles. 

Green Synthesized Nanomaterials as Theranostic Platforms for Cancer Treatment: Principles, Challenges and the Road Ahead

2019 ◽  
Vol 26 (8) ◽  
pp. 1311-1327 ◽  
Author(s):  
Pala Rajasekharreddy ◽  
Chao Huang ◽  
Siddhardha Busi ◽  
Jobina Rajkumari ◽  
Ming-Hong Tai ◽  
...  
Keyword(s):  
Nanoparticle Synthesis ◽  
Research Field ◽  
Synthesis Methods ◽  
Synthetic Approach ◽  
Future Directions ◽  
The Road ◽  
New Methods ◽  
Recent Developments ◽  
Theranostic Applications ◽  
Insight Into

With the emergence of nanotechnology, new methods have been developed for engineering various nanoparticles for biomedical applications. Nanotheranostics is a burgeoning research field with tremendous prospects for the improvement of diagnosis and treatment of various cancers. However, the development of biocompatible and efficient drug/gene delivery theranostic systems still remains a challenge. Green synthetic approach of nanoparticles with low capital and operating expenses, reduced environmental pollution and better biocompatibility and stability is a latest and novel field, which is advantageous over chemical or physical nanoparticle synthesis methods. In this article, we summarize the recent research progresses related to green synthesized nanoparticles for cancer theranostic applications, and we also conclude with a look at the current challenges and insight into the future directions based on recent developments in these areas.

scholarly journals Study on Chromaticity Removal from Mineral Processing Wastewater with Salicylic Hydroxamic Acid by Granular Activated Carbon Catalyzed Ozonation

Minerals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 359
Author(s):  
Liping Zhang ◽  
Shengnian Wu ◽  
Nan Zhang ◽  
Ruihan Yao ◽  
Eryong Wu
Keyword(s):  
Activated Carbon ◽  
Reaction Time ◽  
Hydroxamic Acid ◽  
Ph Value ◽  
Oxygen Demand ◽  
Granular Activated Carbon ◽  
Mineral Processing ◽  
Ultraviolet Absorption Spectrum ◽  
Experimental Conditions ◽  
Removal Ratio

Salicylic hydroxamic acid is a novel flotation reagent used in mineral processing. However, it impacts the flotation wastewater leaving behind high chromaticity which limits its reuse and affects discharge for mining enterprises. This study researched ozonation catalyzed by the granular activated carbon (GAC) method to treat the chromaticity of the simulated mineral processing wastewater with salicylic hydroxamic acid. The effects of pH value, ozone (O3) concentration, GAC dosage, and reaction time on chromaticity and chemical oxygen demand (CODCr) removal were discussed. The results of individual ozonation experiments showed that the chromaticity removal ratio reached 79% and the effluent chromaticity exceeded the requirement of reuse and discharge when the optimal experimental conditions were pH value 3, ozone concentration 6 mg/L, and reaction time 40 min. The orthogonal experimental results of catalytic ozonation with GAC on chromaticity removal explained that the chromaticity removal ratio could reach 96.36% and the chromaticity of effluent was only 20 when the optimal level of experimental parameters was pH value 2.87, O3 concentration 6 mg/L, GAC dosage 0.06 g/L, reaction time 60 min respectively. The degradation pathway of salicylic hydroxamic acid by ozonation was also considered based on an analysis with ultraviolet absorption spectrum and high-performance liquid chromatography (HPLC).

Preferred Hand and Steadiness of Reaction Time

1976 ◽  
Vol 42 (3) ◽  
pp. 983-988 ◽  
Author(s):  
R. Nakamura ◽  
R. Taniguchi ◽  
Y. Oshima
Keyword(s):  
Reaction Time ◽  
Warning Signal ◽  
Experimental Conditions ◽  
Two Factors

RT and its left/right difference of both biceps muscles were measured by electromyogram (EMG) in the bilateral simultaneous flexion of elbows using 11 left- and 13 right-handed subjects under four conditions which were combinations of two factors: warning signal; presence or absence of a fore-period, and position of limbs; elbow 90° or 135°. EMG-RT and its left/right difference were influenced by these factors. The effects of warning and position of limbs were not the same on the preferred and non-preferred hands. It was assumed that EMG-RTs of biceps in the preferred hand were less influenced by these experimental conditions.

Toward rational nanoparticle synthesis: predicting surface intermixing in bimetallic alloy nanocatalysts

Nanoscale ◽  
2017 ◽  
Vol 9 (39) ◽  
pp. 15005-15017 ◽  
Author(s):  
Luke T. Roling ◽  
Manos Mavrikakis
Keyword(s):  
Nanoparticle Synthesis ◽  
Experimental Conditions ◽  
Bimetallic Alloy

The relative barriers to hopping and substitution determine appropriate experimental conditions for the design of nanocatalysts with a given composition.

scholarly journals Effects of Musically-Induced Emotions on Choice Reaction Time Performance

2009 ◽  
Vol 23 (1) ◽  
pp. 59-76 ◽  
Author(s):  
Daniel T. Bishop ◽  
Costas I. Karageorghis ◽  
Noel P. Kinrade
Keyword(s):  
Reaction Time ◽  
White Noise ◽  
Choice Reaction Time ◽  
Emotional States ◽  
Experimental Conditions ◽  
Tennis Players ◽  
Time Performance ◽  
Reaction Time Performance ◽  
Subsequent Choice ◽  
The Impact

The main objective of the current study was to examine the impact of musically induced emotions on athletes’ subsequent choice reaction time (CRT) performance. A random sample of 54 tennis players listened to researcher-selected music whose tempo and intensity were modified to yield six different music excerpts (three tempi × two intensities) before completing a CRT task. Affective responses, heart rate (HR), and RTs for each condition were contrasted with white noise and silence conditions. As predicted, faster music tempi elicited more pleasant and aroused emotional states; and higher music intensity yielded both higher arousal (p < .001) and faster subsequent CRT performance (p < .001). White noise was judged significantly less pleasant than all experimental conditions (p < .001); and silence was significantly less arousing than all but one experimental condition (p < .001). The implications for athletes’ use of music as part of a preevent routine when preparing for reactive tasks are discussed.

Life Cycle Assessment of “Green” Nanoparticle Synthesis Methods

2014 ◽  
Vol 31 (7) ◽  
pp. 410-420 ◽  
Author(s):  
Paramjeet Pati ◽  
Sean McGinnis ◽  
Peter J. Vikesland
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Nanoparticle Synthesis ◽  
Synthesis Methods

scholarly journals Shape Tuning of Magnetite Nanoparticles Obtained by Hydrothermal Synthesis: Effect of Temperature

2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
Nayely Torres-Gómez ◽  
Osvaldo Nava ◽  
Liliana Argueta-Figueroa ◽  
René García-Contreras ◽  
Armando Baeza-Barrera ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Nanoparticle Synthesis ◽  
Effect Of Temperature ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Pure Phase ◽  
High Level ◽  
Shape Tuning ◽  
Magnetite Phase

In this work, we present a simple and efficient method for pure phase magnetite (Fe3O4) nanoparticle synthesis. The phase structure, particle shape, and size of the samples were characterized by Raman spectroscopy (Rm), X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray (EDS), and transmission electron microscopy (TEM). The morphology tuning was controlled by the temperature of the reaction; the nanoparticles were synthesized via the hydrothermal method at 120°C, 140°C, and 160°C, respectively. The Rm and XRD spectra showed that all the nanoparticles were Fe3O4 in a pure magnetite phase. The obtained nanoparticles exhibited a high level of crystallinity with uniform morphology at each temperature, as can be observed through TEM and SEM. These magnetic nanoparticles exhibited good saturation magnetization and the resulting shapes were quasi-spheres, octahedrons, and cubes. The samples showed striking magnetic properties, which were examined by a vibrating sample magnetometer (VSM). It has been possible to obtain a good morphological control of nanostructured magnetite in a simple, economical, and scalable method by adjusting the temperature, without the modification of any other synthesis parameter.

Experimental Studies of the Mental Speed of Schizophrenics

1958 ◽  
Vol 104 (437) ◽  
pp. 1123-1129 ◽  
Author(s):  
Anne Broadhurst
Keyword(s):  
Reaction Time ◽  
Problem Solving ◽  
Motor Performance ◽  
Psychiatric Patients ◽  
Experimental Studies ◽  
Thought Processes ◽  
Mental Functioning ◽  
Experimental Conditions ◽  
Experimental Control ◽  
Schizophrenic Patients

It has been clinically observed that psychiatric patients in general (6, 11) and schizophrenic patients in particular (1, 4) show abnormalities of mental speed, being “retarded” or slower than normals on many measures. Confirmatory evidence on this point is to be found but much of the early work on speed of schizophrenic reactivity used measures of speed of motor performance (12, 13) or of reaction time under various conditions (6), ignoring more fundamental slowness of thought processes. The present studies are concentrated on the recent finding that schizophrenics show abnormally slow mental speed measured in a problem-solving situation (4, 18, 19). The aim of the investigation was to discover the exact conditions under which this abnormality appears, and, thence, by manipulating the experimental conditions, to be able to bring speed of mental functioning under experimental control. This paper describes the attempt to bring speed under control by means of drugs. A second paper (2) deals with the effect of practice upon mental speed.

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