Topochemical synthesis of low-dimensional nanomaterials

Nanoscale ◽  
2020 ◽  
Vol 12 (43) ◽  
pp. 21971-21987
Author(s):  
Qicheng Zhang ◽  
Wenchao Peng ◽  
Yang Li ◽  
Fengbao Zhang ◽  
Xiaobin Fan
Keyword(s):  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Bulk Materials ◽  
The Past ◽  
Low Dimensional ◽  
Physical And Chemical ◽  
And Chemical Properties

Over the past several decades, nanomaterials have been extensively studied owing to having a series of unique physical and chemical properties that exceed those of conventional bulk materials.

scholarly journals Synthesis and applications of nanoporous perovskite metal oxides

2018 ◽  
Vol 9 (15) ◽  
pp. 3623-3637 ◽  
Author(s):  
Xiubing Huang ◽  
Guixia Zhao ◽  
Ge Wang ◽  
John T. S. Irvine
Keyword(s):  
Ionic Conductivity ◽  
Metal Oxides ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Oxygen Mobility ◽  
Redox Behaviour ◽  
The Past ◽  
Physical And Chemical ◽  
Perovskite Type ◽  
And Chemical Properties

Perovskite-type metal oxides have been widely investigated and applied in various fields in the past several decades due to their extraordinary variability of compositions and structures with targeted physical and chemical properties (e.g., redox behaviour, oxygen mobility, electronic and ionic conductivity).

Design of 2D materials – MSi2CxN4-x (M = Cr, Mo, and W; x = 1 and 2) - with tunable electronic and magnetic properties

Nanoscale ◽  
2021 ◽  
Author(s):  
Bowen Li ◽  
Jiazhong Geng ◽  
Haoqiang Ai ◽  
youchao Kong ◽  
Haoyun Bai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
2D Materials ◽  
Chemical Properties ◽  
First Principle ◽  
Physical And Chemical Properties ◽  
Two Dimensional ◽  
Electronic And Magnetic Properties ◽  
The Past ◽  
Physical And Chemical ◽  
And Chemical Properties

Two-dimensional (2D) materials have attracted increasing interest in the past decades due to their unique physical and chemical properties for diverse applications. In this work, we present a first-principle design...

scholarly journals Highlands of the upper Jequitinhonha valley, Brazil: I - characterization and classification

2011 ◽  
Vol 35 (4) ◽  
pp. 1069-1080 ◽  
Author(s):  
Fábio Henrique Alves Bispo ◽  
Alexandre Christofaro Silva ◽  
Pablo Vidal Torrado
Keyword(s):  
Drainage System ◽  
Chemical Properties ◽  
Morphological Properties ◽  
Texture Gradient ◽  
Physical And Chemical Properties ◽  
The Past ◽  
Massive Structure ◽  
Large Plane ◽  
Physical And Chemical ◽  
And Chemical Properties

In the upper Jequitinhonha valley, state of Minas Gerais, Brazi, there are large plane areas known as "chapadas", which are separated by areas dissected by tributaries of the Jequitinhonha and Araçuaí rivers. These dissected areas have a surface drainage system with tree, shrub, and grass vegetation, more commonly known as "veredas", i.e., palm swamps. The main purpose of this study was to characterize soil physical, chemical and morphological properties of a representative toposequence in the watershed of the Vereda Lagoa do Leandro, a swamp near Minas Novas, MG, on "chapadas", the highlands of the Alto Jequitinhonha region Different soil types are observed in the landscape: at the top - Typic Haplustox (LVA), in the middle slope - Xanthic Haplustox (LA), at the footslope - Xanthic Haplustox, gray color, here called "Gray Haplustox" ("LAC") and, at the bottom of the palm swamp - Typic Albaquult (GXbd). These soils were first morphologically described; samples of disturbed and undisturbed soils were collected from all horizons and subhorizons, to evaluate their essential physical and chemical properties, by means of standard determination of Fe, Al, Mn, Ti and Si oxides after sulfuric extraction. The contents of Fe, Al and Mn, extracted with dithionite-citrate-bicarbonate and oxalate treatments, were also determined. In the well-drained soils of the slope positions, the typical morphological, physical and chemical properties of Oxisols were found. The GXbd sample, from the bottom of the palm swamp, is grayish and has high texture gradient (B/A) and massive structure. The reduction of the proportion of crystalline iron compounds and the low crystallinity along the slope confirmed the loss of iron during pedogenesis, which is reflected in the current soil color. The Si and Al contents were lowest in the "LAC" soil. There was a decrease of the Fe2O3/TiO2 ratio downhill, indicating progressive drainage restriction along the toposequence. The genesis and all physical and chemical properties of the soils at the footslope and the bottom of the palm swamp of the "chapadas" of the Alto Jequitinhonha region are strongly influenced by the occurrence of ground water on the surface or near the surface all year long, at present and/or in the past. Total concentrations of iron oxides, Fe d and Fe o in soils of the toposequence studied are related to the past and/or present soil colors and drainage conditions.

scholarly journals Analisis Teknologi Laboratoris Tembikar dari Situs-Situs Das Bengawan Solo, Kabupaten Bojonegoro, Provinsi Jawa Timur

KALPATARU ◽  
2015 ◽  
Vol 24 (1) ◽  
pp. 47
Author(s):  
M. Fadlan S.
Keyword(s):  
Chemical Element ◽  
Chemical Properties ◽  
Laboratory Analysis ◽  
Physical And Chemical Properties ◽  
The Past ◽  
The Difference ◽  
Food And Drink ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstrak. Tembikar merupakan salah satu sisa benda budaya yang paling sering ditemukan dalam penelitian arkeologi, yang terbuat dari tanah liat yang dibakar. Analisis teknologi laboratoris tembikar dari situs-situs di DAS Bengawan Solo Bojonegoro, bertujuan untuk memperoleh hasil yang akurat tentang sifat fisik dan sifat kimia. Melalui kajian analisis teknologi laboratoris dapat digambarkan kualitas tembikar yang dibuat oleh para pengrajin pada masa lampau. Berdasarkan hasil analisis teknologi laboratoris tembikar dari situs-situs DAS Bengawan Solo, Bojonegoro mempunyai kualitas sedang hingga kualitas baik. Tembikar-tembikar tersebut termasuk dalam kategori peralatan sehari-hari yang berfungsi untuk menampung air, mengolah makanan dan untuk penyajian makanan serta minuman. Tingkat pembakarannya mencapai 600°-800° Celcius, dan warna tembikar didominasi warna gelap (dark colors) dibanding dengan warna terang (light colors). Adanya perbedaan prosentase dari setiap unsur kimia pada tembikar tersebut, tidak terlepas dari daya tahan mineral terhadap pelapukan.Abstract. Pottery, which is made of fired clay, is the most frequently found cultural remains during archaeological researches. Technological Laboratory Analysis on pottery from sites along the Bengawan Solo (Solo River) in Bojonegoro aims at obtaining accurate results about the nature of the physical and chemical properties. Through the technological laboratory analysis can be described the quality of pottery made by craftsmen in the past. Based on the results of the analysis, pottery from the sites along the Bengawan Solo, Bojonegoro Regency, have moderate up to good qualities. The pottery belongs to a category of daily equipment that serves to store water, cook food and to serve food and drink. The rate of heat during firing was up to 600°-800° Celsius, and the color of pottery is predominantly dark colors (black colors) with only a few light colors (bright colors). The difference in the percentage of each chemical element in the pottery is due to the durability of the minerals to weathering.

Zeolite Coatings on Porous Monoliths

2006 ◽  
Vol 45 ◽  
pp. 1260-1267 ◽  
Author(s):  
Michael Scheffler ◽  
Franziska Scheffler
Keyword(s):  
Heterogeneous Catalysis ◽  
Ion Exchange ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Support Material ◽  
Porous Substrate ◽  
The Past ◽  
Physical And Chemical ◽  
And Chemical Properties ◽  
Zeolite Coatings

Zeolites find various applications in heterogeneous catalysis, microreactor techniques, sorption techniques, ion exchange and more recently in heat pump applications. In common processes zeolites are used as shaped bodies with a size in the millimeter range. Novel processes made it necessary to apply zeolites as coating on inert or reactive bulk or porous substrate materials. In the past fifteen years various methods for zeolite coatings have been developed and adapted to the specific requirements with respect to the process they are to be used and to the specific physical and chemical properties of the support material.

Thermal Transport in the Copper Powders with Nanometer and Micrometer Particles

2010 ◽  
Vol 126-128 ◽  
pp. 952-956 ◽  
Author(s):  
Ching Yen Ho ◽  
Yu Hsiang Tsai ◽  
Feng Ming Sui
Keyword(s):  
Constant Temperature ◽  
Room Temperature ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Nanosized Particles ◽  
Bulk Materials ◽  
Processing Technologies ◽  
Copper Powders ◽  
Physical And Chemical ◽  
And Chemical Properties

This paper investigates effects of particle size on heat transfer in copper powders. The understanding for thermal properties of the powder is advantageous to the advancement of the processing technologies such as laser cladding, laser sintering, powder metallurgy and its other applications. Nanosized particles possess characteristic physical and chemical properties different from those of bulk materials due to the confinement of electrons, excitons, and photons into small volumes. Therefore it is valuable to discuss the thermal behaviours of powders constituted by nanometer-sized particles. The powder is wrapped up in the slender tube. One end of the slender tube filled with powder is connected to the low constant-temperature reservoir and the other end is kept at room temperature. The temperature histories at the 1cm location of the slender tube from the low constant-temperature reservoir are recorded using thermal couples. Powders of particles with the sizes 50nm and 5000nm are employed in this experiment. The results show that the thermal diffusion in the 50nm Cu powder is faster than that in the 5000nm Cu powder.

scholarly journals Two-Dimensional Platinum Diselenide: Synthesis, Emerging Applications, and Future Challenges

2020 ◽  
Vol 12 (1) ◽  
Author(s):  
Youning Gong ◽  
Zhitao Lin ◽  
Yue-Xing Chen ◽  
Qasim Khan ◽  
Cong Wang ◽  
...  
Keyword(s):  
Chemical Properties ◽  
Research Community ◽  
Physical And Chemical Properties ◽  
Two Dimensional ◽  
Structure Characteristics ◽  
The Past ◽  
Future Challenges ◽  
Potential Applications ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractIn recent years, emerging two-dimensional (2D) platinum diselenide (PtSe2) has quickly attracted the attention of the research community due to its novel physical and chemical properties. For the past few years, increasing research achievements on 2D PtSe2 have been reported toward the fundamental science and various potential applications of PtSe2. In this review, the properties and structure characteristics of 2D PtSe2 are discussed at first. Then, the recent advances in synthesis of PtSe2 as well as their applications are reviewed. At last, potential perspectives in exploring the application of 2D PtSe2 are reviewed.

scholarly journals The physical and chemical properties of planet forming disks

2018 ◽  
Vol 14 (S345) ◽  
pp. 115-123
Author(s):  
Inga Kamp
Keyword(s):  
Chemical Properties ◽  
Planetary Systems ◽  
Protoplanetary Disks ◽  
Formation Processes ◽  
Physical And Chemical Properties ◽  
The Past ◽  
Multi Wavelength ◽  
Axisymmetric Structures ◽  
Physical And Chemical ◽  
And Chemical Properties

AbstractVLT instruments and ALMA have revolutionized in the past five years our view and understanding of how disks turn into planetary systems. They provide exquisite insights into non-axisymmetric structures likely closely related to ongoing planet formation processes. The following cannot be a complete review of the physical and chemical properties of disks; instead I focus on a few selected aspects. I will review our current understanding of the physical properties (e.g. solid and gas mass content, snow and ice lines) and chemical composition of planet forming disks at ages of 1-few Myr, especially in the context of the planetary systems that are forming inside them. I will highlight recent advances achieved by means of consistent multi-wavelength studies of gas AND dust in protoplanetary disks.

Macroaggregate-associated physical and chemical properties of a no-tillage chronosequence in a Miamian soil

2009 ◽  
Vol 89 (3) ◽  
pp. 319-329 ◽  
Author(s):  
C. G. Ochoa ◽  
M. K. Shukla ◽  
R. Lal
Keyword(s):  
Water Content ◽  
Chemical Properties ◽  
Slope Position ◽  
Physical And Chemical Properties ◽  
No Tillage ◽  
The Past ◽  
Available Water ◽  
Available Water Content ◽  
Physical And Chemical ◽  
And Chemical Properties

No-tillage (NT) has been shown to increase macroaggregate stability and soil organic carbon (SOC). Our objective was to quantify the effects of NT duration and slope position on macroaggregate-associated bulk density (ρb), available water content (AWC), hydrolysable and nonhydrolysable OC concentrations in fields under corn rotation. All fields were on Oxyaquic Hapludalfs (Alfisols) classified as Miamian soil. Macroaggregates (5-8 mm diameter) were separated from triplicate soil samples collected from 0-10 and 10-20 cm depths of the summit slope (SS) and toe slope (TS) positions from four fields under NT for the past 15 yr (NT15), 10 yr (NT10), 6 yr (NT6) and also from a chisel-tilled field (NT0) to a depth of 20 cm. At the SS position, macroaggregate-associated hydrolysable and nonhydrolysable OC were greater for NT15 than NT6 in both depths. At the TS position, hydrolysable OC was greater for NT10 than NT6 in the 0-10 cm depth only. Macroaggregate-associated AWC and hydrolysable OC were positively related to the NT duration, especially at the SS position. A positive correlation was obtained between water-stable macroaggregates (WSA) and hydrolysable OC at both depths and slope positions. A negative correlation between WSA and nonhydrolysable OC was observed at SS and TS positions in the 0-10 cm depth only. The increase in aggregate-associated hydrolysable OC at the SS position of fields under NT for 15 yr indicates that C accretion in macroaggregates is likely dependent on the continuation of NT.Key words: No-tillage, macroaggregate-associated available water content, hydrolysable carbon, nonhydrolysable carbon, macroaggregate stability

scholarly journals Chains of carbon atoms: A vision or a new nanomaterial?

2015 ◽  
Vol 6 ◽  
pp. 559-569 ◽  
Author(s):  
Florian Banhart
Keyword(s):  
Experimental Situation ◽  
Chemical Properties ◽  
Experimental Information ◽  
Theoretical Studies ◽  
Physical And Chemical Properties ◽  
One Dimensional ◽  
The Past ◽  
The Stability ◽  
Physical And Chemical ◽  
And Chemical Properties

Linear strings of sp1-hybridized carbon atoms are considered as a possible phase of carbon since decades. Whereas the debate about the stability of the corresponding bulk phase carbyne continues until today, the existence of isolated chains of carbon atoms has meanwhile been corroborated experimentally. Since graphene, as the two-dimensional sp2-bonded allotrope of carbon, has become a vast field, the question about the importance of one-dimensional carbon became of renewed interest. The present article gives an overview of the work that has been carried out on chains of carbon atoms in the past one or two decades. The review concentrates on isolated chains of carbon atoms and summarizes the experimental observations to date. While the experimental information is still very limited, many calculations of the physical and chemical properties have been published in the past years. Some of the most important theoretical studies and their importance in the present experimental situation are reviewed.

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