scholarly journals Nanostructured Ceria: Biomolecular Templates and (Bio)applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2259
Author(s):  
Petr Rozhin ◽  
Michele Melchionna ◽  
Paolo Fornasiero ◽  
Silvia Marchesan
Keyword(s):  
Nucleation And Growth ◽  
Redox Properties ◽  
Biological Applications ◽  
Experimental Conditions ◽  
Environmental Preservation ◽  
Nanostructured Ceria ◽  
In Virtue Of

Ceria (CeO2) nanostructures are well-known in catalysis for energy and environmental preservation and remediation. Recently, they have also been gaining momentum for biological applications in virtue of their unique redox properties that make them antioxidant or pro-oxidant, depending on the experimental conditions and ceria nanomorphology. In particular, interest has grown in the use of biotemplates to exert control over ceria morphology and reactivity. However, only a handful of reports exist on the use of specific biomolecules to template ceria nucleation and growth into defined nanostructures. This review focusses on the latest advancements in the area of biomolecular templates for ceria nanostructures and existing opportunities for their (bio)applications.

Aesthetic and Historical Values - Their Difference and Why It Matters

2020 ◽  
Vol 29 (5) ◽  
pp. 519-535
Author(s):  
Levi Tenen
Keyword(s):  
Natural Environments ◽  
Aesthetic Value ◽  
Environmental Preservation ◽  
Historical Significance ◽  
Recent Scholarship ◽  
In Virtue Of

Aesthetic and historical values are commonly distinguished from each other. Yet there has not been sustained discussion of what, precisely, differs between them. In fact, recent scholarship has focused on various ways in which the two are related. I argue, though, that historical value can differ in an interesting way from aesthetic value and that this difference may have significant implications for environmental preservation. In valuing something for its historical significance, it need not always be the case that there is a reason to want people to experience the entity. Valuing something for its aesthetic merit, by contrast, does imply a reason to want people to experience the entity. I suggest that in virtue of this difference, some historical values may offer better justification for preserving natural environments than do aesthetic considerations.

The electro-deposition of silver on stationary and rotating glassy carbon discs

1977 ◽  
Vol 55 (23) ◽  
pp. 4037-4044 ◽  
Author(s):  
Remigio Germano Barradas ◽  
Stephen Fletcher ◽  
Sandor Szabo
Keyword(s):  
Experimental Data ◽  
Mass Transport ◽  
Glassy Carbon ◽  
Quantitative Model ◽  
Nucleation And Growth ◽  
Experimental Conditions ◽  
Electro Deposition ◽  
Transport Effects ◽  
Mass Transport Effects

The deposition of silver onto glassy carbon is described. The solution consisted of 10−2 M AgClO4 in 1.0 M HClO4. Experiments reveal the difficulties in trying to separate nucleation and growth phenomena from mass transport effects. A simple semi-quantitative model is proposed to explain the experimental data. It is also shown that the deposition reaction is not completely reversible under certain experimental conditions.

scholarly journals Synthesis, design and sensing applications of nanostructured ceria-based materials

The Analyst ◽  
2018 ◽  
Vol 143 (23) ◽  
pp. 5610-5628 ◽  
Author(s):  
Sayed Tayyab Raza Naqvi ◽  
Bahareh Shirinfar ◽  
Saadat Majeed ◽  
Muhammad Najam-ul-Haq ◽  
Dilshad Hussain ◽  
...  
Keyword(s):  
Redox Properties ◽  
Sensing Applications ◽  
Synthesis Design ◽  
Valence States ◽  
Nanostructured Ceria

Cerium-based materials possess redox properties due to the presence of dual valence states of Ce3+ and Ce4+.

Nucleation, Growth and Ostwald Ripening of Cosi2 Precipitates During Co Ion Implantation In Si

1994 ◽  
Vol 354 ◽  
Author(s):  
S. Reiss ◽  
M. O. Ruault ◽  
J. Clayton ◽  
O. Kaitasov ◽  
K.-H. Heinig ◽  
...  
Keyword(s):  
Nucleation Rate ◽  
Ostwald Ripening ◽  
Ion Beam ◽  
Nucleation And Growth ◽  
Experimental Investigations ◽  
Experimental Conditions ◽  
High Fluences ◽  
Level Of Understanding ◽  
And Diffusion ◽  
Evolution Of Precipitates

AbstractThe experimental conditions during the implantation step of Ion Beam Synthesis influence crucially the formation of a buried structure in subsequent annealing steps. Due to of the complexity of the in-beam nucleation and evolution of precipitates of new phases there is still a low level of understanding. In this paper we present results of direct experimental investigations as well as results of computer simulations of in-beam nucleation and growth. The evolution of an ensemble of C0SÌ2 precipitates is mainly controlled by nucleation and diffusion. The observed decrease of the nucleation rate at high fluences can be explained by the decrease of the supersaturation of implanted atoms due to diffusion towards earlier nucleated precipitates.

Nanostructured ceria-based catalysts doped with La and Nd: how acid-base sites and redox properties determine the oxidation mechanisms

2021 ◽  
Author(s):  
Enrico Sartoretti ◽  
Chiara Novara ◽  
Angelica Chiodoni ◽  
Fabrizio Giorgis ◽  
Marco Piumetti ◽  
...  
Keyword(s):  
Redox Properties ◽  
Acid Base ◽  
Nanostructured Ceria ◽  
Oxidation Mechanisms

Ion Beam-induced Quantum Dot Synthesis in Glass

2007 ◽  
Vol 1020 ◽  
Author(s):  
Harry Bernas ◽  
Roch Espiau de Lamaëstre
Keyword(s):  
Formation Process ◽  
Gamma Ray ◽  
Thermal Evolution ◽  
Ion Beam ◽  
Nucleation And Growth ◽  
Redox Properties ◽  
Size Distributions ◽  
Latent Image ◽  
Deposited Energy ◽  
Ag Nanoclusters

AbstractIrradiation-induced processes are often considered only in their nonequilibrium aspects. The purpose of this brief review is to show that chemistry, and particularly redox properties, play a major role in the thermal evolution of such systems and generally cannot, therefore, be neglected. This is exemplified by the synthesis of Ag nanoclusters in glasses and silica, under both low (gamma-ray) and high (MeV ion) deposited energy density irradiation conditions. The nanocluster formation mechanism is shown to be similar to the latent image formation process in photography. The corresponding information was used to control nucleation and growth of PbS clusters in glasses, leading to promising optical properties. In the course of these studies, we also showed that lognormal size distributions characterize the absence of information on the nanocluster formation process.

Optimization of experimental conditions for the monitoring of nucleation and growth of racemic Diprophylline from the supercooled melt

2017 ◽  
Vol 472 ◽  
pp. 11-17 ◽  
Author(s):  
Aurélien Lemercier ◽  
Quentin Viel ◽  
Clément Brandel ◽  
Yohann Cartigny ◽  
Eric Dargent ◽  
...  
Keyword(s):  
Nucleation And Growth ◽  
Experimental Conditions ◽  
Supercooled Melt ◽  
Optimization Of Experimental Conditions

Electrolytic Manganese Dioxide Nucleation and Growth on Titanium Substrates

2008 ◽  
Vol 570 ◽  
pp. 114-119 ◽  
Author(s):  
A.J.B. Dutra ◽  
I.C.F. Almeida
Keyword(s):  
Manganese Dioxide ◽  
Three Dimensional ◽  
Nucleation And Growth ◽  
Manganese Sulfate ◽  
X Ray Diffraction ◽  
Electrolytic Manganese Dioxide ◽  
Experimental Conditions ◽  
Surface Areas ◽  
Electrolytic Manganese ◽  
Titanium Substrates

Electrolytic manganese dioxide (EMD) nucleation and growth on titanium substrates from acidic manganese sulfate solutions was studied at 65oC and 90oC at different potentials and sulfuric acid concentrations. Electrochemical experiments allied to SEM examination were performed to characterize the mechanism of nucleation and its evolution with time. The EMD powder produced after a constant charge electrolysis of 448 mA·h was analyzed by SEM, BET, DTA/TG and X-ray diffraction. Results indicated that depending on the experimental conditions nucleation can be either progressive or instantaneous and when three-dimensional nuclei were formed the manganese dioxide deposit presented a higher specific surface area. Surface areas ranging from 51.8 to 168.8 m2/g were obtained under the conditions tested.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

Electrolytic Isolation of Twin-Type Shock Deformation Structures

1967 ◽  
Vol 25 ◽  
pp. 318-319
Author(s):  
F. I. Grace ◽  
L. E. Murr
Keyword(s):  
Grain Boundaries ◽  
Thin Foil ◽  
Electrolyte Composition ◽  
Experimental Conditions ◽  
Average Current Density ◽  
Electron Transmission ◽  
Deformation Structures ◽  
The Matrix ◽  
Average Current ◽  
Specimen Edge

During the course of electron transmission investigations of the deformation structures associated with shock-loaded thin foil specimens of 70/30 brass, it was observed that in a number of instances preferential etching occurred along grain boundaries; and that the degree of etching appeared to depend upon the various experimental conditions prevailing during electropolishing. These included the electrolyte composition, the average current density, and the temperature in the vicinity of the specimen. In the specific case of 70/30 brass shock-loaded at pressures in the range 200-400 kilobars, the predominant mode of deformation was observed to be twin-type faults which in several cases exhibited preferential etching similar to that observed along grain boundaries. A novel feature of this particular phenomenon was that in certain cases, especially for twins located in the vicinity of the specimen edge, the etching or preferential electropolishing literally isolated these structures from the matrix.

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