Chemical Compostion Analysis on Sintered Gold and Platinum Nanoparticles

2000 ◽  
Vol 6 (S2) ◽  
pp. 28-29
Author(s):  
S. Lu ◽  
N. Yao ◽  
I. A. Aksay
Keyword(s):  
Sodium Citrate ◽  
Chemical Properties ◽  
Volume Ratio ◽  
Pt Nanoparticles ◽  
Intermediate Stage ◽  
Bulk Solid ◽  
Extended Solids ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
And Chemical Properties

Nanoparticles continue to attract interests because they fall into intermediate stage between molecular and macroscopic materials. Due to their large surface-to-volume ratio, nanoparticles exhibit physical and chemical properties that differ markedly from those characterizing the bulk solid state. One example is the phase diagram of a nanomaterial. Because nanocrystals display clear changes in both the thermodynamics and the kinetics of phase transitions, we expect different solubility limits in the nanometer regime. This means that phases unstable or unobserved in extended solids may be prepared as nanocrystals. We synthesized Au and Pt nanoparticles and performed chemical analysis on the sintered agglomerates.The colloidal Au and Pt particles were synthesized according to Turkevich's method. An aqueous AuCl3 solution (50mg Au/L) was heated to 70°C. A determined amount of lwt% aqueous sodium citrate dihydrate (Na3C6H5O7.2H2O) solution was added such that the citrate-to-Au mass ratio was 10.

Template Based Synthesis of Ni Nanowires by Electrochemical Deposition

2015 ◽  
Vol 1114 ◽  
pp. 121-128
Author(s):  
George Tepes ◽  
Ruxandra Vidu ◽  
Cosmin Mihai Cotrut ◽  
Maria Diana Vranceanu ◽  
Alecs Matei ◽  
...  
Keyword(s):  
Electrochemical Deposition ◽  
Environmental Scanning Electron Microscopy ◽  
Chemical Properties ◽  
Volume Ratio ◽  
One Dimension ◽  
Environmental Scanning ◽  
Nickel Nanowires ◽  
Physical And Chemical ◽  
Nanoscale Range ◽  
And Chemical Properties

During the last decade an increasing number of researchers focused on materials that have at least one dimension in the nanoscale range. That one dimension has immense impact on the physical and chemical properties of the materials, which is mainly due to the large surface to volume ratio. In order to modify the ratio of surface to volume, many shapes can be produced. Each shape is more useful in certain application than in others (e.g. nanowires are more used in sensors then other shapes and nanospheres are more used in medicine).In this paper, nickel nanowires were grown by electrochemical deposition into polycarbonate track etched (PCTE) membrane. The morphology and size of Ni NWs were examined using an Environmental Scanning Electron Microscopy equipped with energy dispersive X-ray spectroscopy.

scholarly journals Silver Nanoparticles and Mitochondrial Interaction

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Eriberto Bressan ◽  
Letizia Ferroni ◽  
Chiara Gardin ◽  
Chiara Rigo ◽  
Michele Stocchero ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
High Surface ◽  
Specific Interaction ◽  
Antimicrobial Properties ◽  
Chemical Properties ◽  
Volume Ratio ◽  
Clear Understanding ◽  
Different Types ◽  
Physical And Chemical ◽  
And Chemical Properties

Nanotechnology has gone through a period of rapid growth, thus leading to the constant increase in the application of engineered nanomaterials in daily life. Several different types of nanoparticles have been engineered to be employed in a wide array of applications due to their high surface to volume ratio that leads to unique physical and chemical properties. So far, silver nanoparticles (AgNps) have been used in many more different medical devices than any other nanomaterial, mainly due to their antimicrobial properties. Despite the promising advantages posed by using AgNps in medical applications, the possible health effects associated with the inevitable human exposure to AgNps have raised concerns as to their use since a clear understanding of their specific interaction with biological systems has not been attained yet. In light of such consideration, aim of the present work is the morphological analysis of the intracellular behavior of AgNps with a diameter of 10 nm, with a special attention to their interaction with mitochondria.

Research on physico-chemical properties of sugars and sugar crystallization at the University of Chemistry and Technology in Prague

2020 ◽  
pp. 294-298
Author(s):  
Z. Bubnik ◽  
P. Kadlec ◽  
E. Sarka ◽  
V. Pour ◽  
A. Hinkova ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Main Research ◽  
Research Areas ◽  
Research Activities ◽  
Physico Chemical ◽  
Wide Range ◽  
The University ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
And Chemical Properties

This paper represents a summary of most important research activities in sucrose crystallization, in which the Department of Carbohydrates and Cereals, part of the University of Chemistry and Technology (UCT) Prague, has been involved over the last 25 years. A wide range of these projects has been carried out in cooperation with other research institutes, universities and industrial partners. These activities can be divided into four main research areas that are interconnected and support each other. – Physical and chemical properties of sucrose and sugar solutions; – Growth kinetics of sugar crystals in pure and technical sugar solutions; – Simulation and mathematical modeling of new processes and technologies; – Experimental work for industry and cooperation with industrial partners.

The Kinetics and Occurrence of Optimum Vulcanization

1956 ◽  
Vol 29 (2) ◽  
pp. 555-567
Author(s):  
B. A. Dogadkin
Keyword(s):  
Molecular Weight ◽  
Tensile Strength ◽  
Structure Formation ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Smooth Curves ◽  
Intermolecular Reaction ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
And Chemical Properties

Abstract The fundamental reaction of vulcanization is the combination of a vulcanizing agent with rubber. The kinetics of this reaction is expressed by smooth curves. Simultaneously with the combining of the vulcanizing agent, in fact as a result of it, changes take place in a number of physical and chemical properties of rubber—solubility, modulus, tensile strength, and other indexes. Unlike the kinetics of combination of the vulcanizing agent, the changes in these properties are most often represented by curves having a maximum or minimum which characterizes the phenomenon of optimum vulcanization. The extreme form which curves of changes of physical and chemical properties of rubber assume during vulcanization can be explained, in our opinion, by the fact that, during vulcanization, there is a competition between opposing reactions, of which one set are reactions of structure formation (i.e., increase of the molecular weight and the intensity of intermolecular reaction), and the others are destruction reactions. Thus, during vulcanization under factory conditions, at least two reactions take place: (1) the reaction between rubber and sulfur, and (2) the reaction between rubber and molecular oxygen introduced into the vulcanization mix by milling with the ingredients. The amount of oxvgen present here in moles approaches the molar concentration of sulfur.

Research of Pharmaceutical Sludge on Choosing Compost Technology and Evaluation of Fertilizer Efficiency

2013 ◽  
Vol 448-453 ◽  
pp. 719-723
Author(s):  
Hao Wu ◽  
Yu Long Zhang
Keyword(s):  
Chemical Properties ◽  
Volume Ratio ◽  
Soil Nutrient ◽  
Desert Soil ◽  
Fertilizer Efficiency ◽  
Urban Greening ◽  
Compost Process ◽  
Physical And Chemical ◽  
Processing Period ◽  
And Chemical Properties

This paper confirmed the best compost process and parameter of pharmaceutical sludge by forced aerated compost experiment. The volume ratio between sludge and straw is 2:1. The first fermentation is 0-14 days and the primary ventilation quantity is 6m3/h·m3. The second fermentation is 15-35 days. 35 days later, the sludge will be moved from compost tank to space for the post-processing period. 50 days later, composting sludge is completely decomposed. The application effect of sludge fertilizer was analyzed on the lawn and desert land. Rotten sludge fertilizer can raise soil fertility, promote the growth of grass, and be applied in urban greening, and then this can avoid the heavy metals and harmful material entering the food chain. That the sludge fertilizer exploited in desert soil can improve the sand soil nutrient effectively and amend the poor physical and chemical properties of desert soil. Therefore, the entire achievement can be used to strengthen wind prevention and sand fixation and treat ecosystem recession of desert land.

Multidimensional graphene nanostructures – synthesis and applications

2020 ◽  
Vol 92 (12) ◽  
pp. 1929-1936
Author(s):  
Raghav Garg ◽  
Daniel San Roman ◽  
Tzahi Cohen-Karni
Keyword(s):  
Three Dimensional ◽  
Chemical Properties ◽  
Volume Ratio ◽  
Direct Consequence ◽  
Material Structure ◽  
Physical And Chemical Properties ◽  
Related Research ◽  
2D Nanomaterials ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractConventional graphene electronics fail to leverage the exceptional surface-area-to-volume ratio of graphene due to the challenges imposed by arranging two-dimensional (2D) nanomaterials in three-dimensional (3D) spaces. Recently, a new topology of graphene, nanowire template 3D fuzzy graphene (NT-3DFG), has been developed to overcome this limitation. We provide an overview of the unique physical and chemical properties of NT-3DFG that are a direct consequence of the material structure and describe NT-3DFG’s promising applications in bioelectronics and energy-related research.

scholarly journals Modeling of pharmacokinetic processes of distribution of cisplatin in tumor tissues

2020 ◽  
pp. 106-108
Author(s):  
Д.А. Гиневский ◽  
П.В. Ижевский ◽  
И.Н. Шейно ◽  
Д.Г. Левитова
Keyword(s):  
In Silico ◽  
Chemical Properties ◽  
Malignant Neoplasms ◽  
Physical And Chemical Properties ◽  
Chemotherapeutic Drug ◽  
Tissue Organization ◽  
Tumor Tissues ◽  
Physical And Chemical ◽  
Kinetics Of ◽  
And Chemical Properties

Разработана математическая модель пространственно-временного распределения радиомодифицирующего агента химиотерапевтического препарата цисплатина с заданными физико-химическими свойствами на тканевом и клеточном уровнях организации биологической ткани. Эксперимент in silico позволил получить данные о кинетике внутриклеточного распределения цисплатина. Модель может быть адаптирована для определения 3D кинетики наночастиц, а также других препаратов для диагностики или терапии злокачественных новообразований. A mathematical model of the space-time distribution of a radiomodifying agent - a chemotherapeutic drug - cisplatin with specified physical and chemical properties at the tissue and cellular levels of the biological tissue organization has been developed. The in silico experiment provided data on the kinetics of the intracellular distribution of cisplatin. The model can be adapted to determine the 3D kinetics of nanoparticles, as well as other drugs for the diagnosis or therapy of malignant neoplasms.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

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