scholarly journals Materials processing using supercritical fluids

2005 ◽  
Vol 59 (9-10) ◽  
pp. 213-223 ◽  
Author(s):  
Aleksandar Orlovic ◽  
Dejan Skala
Keyword(s):  
Supercritical Fluids ◽  
Rapid Expansion ◽  
Nano Particles ◽  
New Materials ◽  
Materials Synthesis ◽  
New Methods ◽  
Synthesis Parameters ◽  
Fluid Environment ◽  
New Applications ◽  
Synthesized Materials

One of the most interesting areas of supercritical fluids applications is the processing of novel materials. These new materials are designed to meet specific requirements and to make possible new applications in Pharmaceuticals design, heterogeneous catalysis, micro- and nano-particles with unique structures, special insulating materials, super capacitors and other special technical materials. Two distinct possibilities to apply supercritical fluids in processing of materials: synthesis of materials in supercritical fluid environment and/or further processing of already obtained materials with the help of supercritical fluids. By adjusting synthesis parameters the properties of supercritical fluids can be significantly altered which further results in the materials with different structures. Unique materials can be also obtained by conducting synthesis in quite specific environments like reversed micelles. This paper is mainly devoted to processing of previously synthesized materials which are further processed using supercritical fluids. Several new methods have been developed to produce micro- and nano-particles with the use of supercritical fluids. The following methods: rapid expansion of supercritical solutions (RESS) supercritical anti-solvent (SAS), materials synthesis under supercritical conditions and encapsulation and coating using supercritical fluids were recently developed.

Polymerase synthesis of base-modified DNA: new methods and new applications

2014 ◽  
Author(s):  
Jana Balintová ◽  
Jitka Daďová ◽  
Pavel Kielkowski ◽  
Petra Ménová ◽  
Zuzana Vaníková ◽  
...  
Keyword(s):  
New Methods ◽  
Modified Dna ◽  
New Applications

Nanocomposites: Retrospecr and Prospect

1992 ◽  
Vol 286 ◽  
Author(s):  
Rustum Roy
Keyword(s):  
Major Part ◽  
Size Range ◽  
Nanocomposite Materials ◽  
One Dimension ◽  
New Materials ◽  
Infinite Class ◽  
Materials Synthesis ◽  
The World ◽  
Two Phases ◽  
Nanometer Size Range

ABSTRACTIn this paper we make clear distinctions from the terms nanophase, nanocrystalline and deal only with nanocomposites defined as an interacting mixture of two phases, one of which is in the nanometer size range in at least one dimension. The author's origins of development of the idea that nanocomposites are a virtually infinite class of new materials are described.Then we refer to the results of our extensive studies of nanocomposites derived by solution-solgel techniques to illustrate the properties of such materials in the area of chemical and thermal reactivity.Finally it is pointed out that in the last few years nanocomposite materials have become a major part of new materials synthesis all over the world for applications ranging from mechanical to optical, to magnetic to dielectric.

scholarly journals Electrospun Nanofibers: Materials, Synthesis Parameters, and Their Role in Sensing Applications

2021 ◽  
pp. 2100410
Author(s):  
Saraswathi Kailasa ◽  
M. Sai Bhargava Reddy ◽  
Muni Raj Maurya ◽  
B. Geeta Rani ◽  
K. Venkateswara Rao ◽  
...  
Keyword(s):  
Electrospun Nanofibers ◽  
Materials Synthesis ◽  
Sensing Applications ◽  
Synthesis Parameters

Synthesis of Nanosized HMS Mesoporous Molecular Sieve in an Ionic Liquid-Water Mixture

2011 ◽  
Vol 236-238 ◽  
pp. 2110-2113
Author(s):  
Hong Liu ◽  
Meng Yang Wang ◽  
Wei Ran Cao
Keyword(s):  
Electron Microscopy ◽  
Ionic Liquid ◽  
Sol Gel ◽  
Mesoporous Molecular Sieve ◽  
Nano Particles ◽  
Water Mixture ◽  
X Ray ◽  
Transmission Electron ◽  
Adsorption Desorption ◽  
Synthesized Materials

The hexagonal mesoporous silica (HMS) nano-particles were prepared in mixture of 1-butyl-3-methyl-imidazolium tetrafluoroborate (BMIM+BF4-) ionic liquid and water by a sol-gel method. The structure and morphology of obtained materials were characterized by X-ray powder diffraction (XRD), N2adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The influence of the amount of BMIM+BF4-was investigated. It was shown that the synthesized materials have discrete and uniform spherical morphology with the size in the range of 68-177 nm (obtained from DLS measurements), and the particle size of HMS can be controlled by varying the amount of BMIM+BF4-.

scholarly journals Geographic Information System (GIS) and Its Application in Urban Planning and Environment

2014 ◽  
Vol 3 (6) ◽  
pp. 78-85
Author(s):  
Masood Safari Ali Akbari
Keyword(s):  
Urban Planning ◽  
Environmental Issues ◽  
Point Of View ◽  
Land Evaluation ◽  
Rapid Expansion ◽  
Land Uses ◽  
Urban Green Spaces ◽  
New Methods ◽  
Clear Point ◽  
Data Layers

Using satellite data and GIS, the location of various urban land uses, including new methods for locating is quick. This study, based on a method of analysis - descriptive, and benefit from the resources in this area to assess the effectiveness of GIS in urban planning and environment, is discussed, and attempted to make a clear point of view, this can provide. Our results indicate that, nowadays, several researchers, from capabilities of GIS are used for localization. Because GIS is able to analyze large amounts of data layers is. Use of GIS in urban planning, with the rapid expansion of cities and increased levels of SAM binding information that must be processed for urban management, is clear. Abnormal location for the development of suitable sites for the establishment of urban green spaces, places for waste disposal and land evaluation, and its features and many other environmental issues, it can be pointed out.

THE DETECTION OF GRAVITATIONAL WAVES

1996 ◽  
Vol 05 (02) ◽  
pp. 101-150 ◽  
Author(s):  
L. JU ◽  
D.G. BLAIR
Keyword(s):  
Gravitational Waves ◽  
Galaxy Formation ◽  
Laser Interferometer ◽  
New Materials ◽  
Noise Sources ◽  
Detector Performance ◽  
Wave Detection ◽  
New Methods ◽  
Stochastic Background ◽  
Improve Detector

This paper reviews the field of gravitational wave detection. The characteristics of gravitational waves and the possible sources of detectable waves are discussed. This includes a discussion of a new source, the stochastic background of cosmological gravitational waves from supernovae during the epoch of galaxy formation. Methods of using both resonant mass antennas and laser interferometer detectors are reviewed. Noise sources that limit detector sensitivity are summarised, while new methods, and new materials which can simplify and improve detector performance are described.

scholarly journals Crystalline Structure, Synthesis, Properties and Applications of Potassium Hexatitanate: A Review

Materials ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4132 ◽  
Author(s):  
Patricia Ponce-Peña ◽  
Martha Poisot ◽  
Alicia Rodríguez-Pulido ◽  
María Azucena González-Lozano
Keyword(s):  
Material Properties ◽  
Mechanical Performance ◽  
Synthesis Method ◽  
Tunnel Structure ◽  
Chemical Formula ◽  
New Materials ◽  
Structure Synthesis ◽  
Synthesis Properties ◽  
New Applications ◽  
Potassium Hexatitanate

Potassium hexatitanate (PHT) with chemical formula K2Ti6O13 has a tunnel structure formed by TiO2 octahedra sharing edges or corners and with the potassium atoms located in the tunnels. This material has attracted great interest in the areas of photocatalysis, reinforcement of materials, biomaterials, etc. This work summarizes a large number of studies about methods to prepare PHT since particle size can be modified from millimeter to nanometric scale according to the applied method. Likewise, the synthesis method has influenced the material properties as band-gap and the final mechanical performance of composites when the reinforcement is PHT. The knowing of synthesis, properties and applications of PHT is worthwhile for the design of new materials and for the development of new applications taking advantage of their inherent properties.

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