Through selected examples, we have demonstrated the importance of using nanoparticles of oxides to obtain nanostructured sintered ceramics at low sintering temperatures. For this purpose, we have prepared two series of single doped ceria solid solutions of the general formulae Ce1−xMxO2−δ, where M = Gd and Sm and x = 0.05-0.2 using a modified combustion process, namely a mixed fuel process with a mixture of fuels, such as citric acid and glycine. Independent of the nature of the metal ions all the compositions formed doped Ce1−xMxO2−δ ceria in-situ with improved powder properties such as finer particle size and high surface area. Highly reactive powders that could achieve resultant sintered density of ≥98% of the theoretical density were achieved by this synthetic approach. Moreover, the sintered Ce1−xMxO2−δ powders exhibited enhanced densification and controlled grain growth and exhibited nano-sized grains in the sintered microstructures. A correlation could be established between the agglomerate size of the powders and the ultimate grain size of the sintered powder compacts. In addition, these powders have the potential of exhibiting substantial stability against reduction by retaining relatively high density over a wide range of temperatures. The cited examples clearly demonstrate an incremental increase in property, viz., enhanced sinterability of the particles due to nanosize effect.
- Inderscience Publishers
- Towards achieving nano-structured sintered ceramics with high ...
WDI – Industrial Water Deionizer
The ion exchange system produces (DI) deionized water at a 90% lower cost than service exchange with regeneration of its duplex alternating cation and anion exchange… Learn More At Water Innovations, Inc. we engineer solutions for wastewater treatment, closed loop water recycling and purification. We utilize ion exchange to produce the highest quality water with the lowest waste volume. Our Best-In-Class ion exchange systems utilize Smart Regeneration Control (SRC) delivering precise regeneration...
Standardizing defluoridation of community waters using bone char
Different bone char (BC) preparation methods affect the physical chemical properties and therefore the capacity to remove fluoride. Fluoride removal capacities of BC prepared at three controlled temperatures, with particle grain sizes of 250–500 μm, 500–1,000 μm and 1,000–1,800 μm were determined in column experiments with an initial fluoride concentration of 8.55 mg/L. The sorbent was calcined at 400°C, 500°C and 600°C. BC calcined at 400°C had better fluoride removal performance compared to those calcined at...
China To Double Ethanol Production by 2020
On December 5, 2016, China`s National Energy Administration (NEA) published a five-year plan that aims to increase ethanol production to four million tons by 2020 despite the government maintaining strict control over the use of food grains. The target remains unchanged from the previous five-year plan that ended in 2015. NEA intends to increase the share of non-fossil fuel consumption from 12 percent to 15 percent by 2020, in part through the vigorous development of fiber ethanol from the inedible parts of...
Rice Milling Machine-- paddy de-cleaner and paddy separator
Rice is one of the nomal grain in our daily. The increasing demannd for rice has greatly improved business that related to rice. Rice milling is a most important process for rice and paddy. With the highly development of economy, rice milling equipment has play a key role in rice business,especially for the commercial purpose. Hence the development ofrice mill machine is more effective, more efficient and more quality is promising In order to improve rice quality to get the national standard, some rice processing...
Spatio-temporal variation of water supply in Guizhou Province, China
Water supply is an important freshwater ecosystem service provided by ecosystems. Water shortages resulting from spatio-temporal heterogeneity of climate condition or human activities present serious problems in the Guizhou Province of southwest China. This study aimed to analyze the spatio-temporal changes of water supply service using the Integrated Valuation of Ecosystem Services and Tradeoffs (InVEST) model, explore how climate and land-use changes impact water supply provision, and discuss the impact of...