Effect of Magnesia-Chrome Synthetic Materials on Magnesia-Alumina-Chrome Ramming Mixes

Magnesia-alumina-chrome ramming mixes with same chemical compositions were prepared by using different raw materials such as fused magnesia-chrome synthetic materials and sintered one, wasted bricks and magnesia-alumina spinels. Their physical properties were tested and microstructures were analyzed. The results show that the ramming mixes made of different raw materials bring about different microstructures and properties although the mixes have the same chemical composition, binder content and aggregate size composition.

CO_(2)capture costs of chemical looping combustion of biomass:A comparison of natural and synthetic oxygen carrier

Chemical looping combustion has the potential to be an efficient and low-cost technology capable of contributing to the reduction of the atmospheric concentration of CO_(2) in order to reach the 1.5/2°C goal and mitigate climate change.In this process,a metal oxide is used as oxygen carrier in a dual fluidized bed to generate clean CO_(2) via combustion of biomass.Most commonly,natural ores or synthetic materials are used as oxygen carrier whereas both must meet special requirements for the conversion of solid fuels.Synthetic oxygen carriers are characterized by higher reactivity at the expense of higher costs versus the lower-cost natural ores.To determine the viability of both possibilities,a techno-economic comparison of a synthetic material based on manganese,iron,and copper to the natural ore ilmenite was conducted.The synthetic oxygen carrier was characterized and tested in a pilot plant,where high combustion efficiencies up to 98.4%and carbon capture rates up to 98.5%were reached.The techno-economic assessment resulted in CO_(2) capture costs of 75 and 40€/tCO_(2) for the synthetic and natural ore route respectively,whereas a sensitivity analysis showed the high impact of production costs and attrition rates of the synthetic material.The synthetic oxygen carrier could break even with the natural ore in case of lower production costs and attrition rates,which could be reached by adapting the production process and recycling material.By comparison to state-of-the-art technologies,it is demonstrated that both routes are viable and the capture cost of CO_(2) could be reduced by implementing the chemical looping combustion technology.

An approach towards identification of leather from leather-like polymeric material using FTIR-ATR technique

Leather,a by-product of the meat industry,has unique strength,elasticity,water vapor permeability,resistance to abrasion,durability,and longevity.In the background of ISO 15115:2019,the authenticity of leather has become a subject matter of concern.There is a need to distinguish leather(animal origin)from other leather-like materials derived from fossil fuel(PU,faux leather,etc.)and agro-product-driven vegan materials,which are also sold in the market as leather.For this purpose,this work relies on the signature FTIR bands of collagen(the skin-making protein)as a starting point to distinguish between animal origin and rest.A detailed investigation of all types of materials used in lifestyle products has been carried out to assess the boundary lines of this hypothesis.It is reasonably concluded that the signature AmideⅠ,Ⅱ,andⅢbands of collagen occurring at 1600,1500,and 1200 cm^(-1)could serve as the first line to distinguish against all materials other than nylon and in the case of nylon,and the Amide A band at 3200 cm^(-1),forms the basis for differentiation from nylon.In essence,the FTIR spectra can be used as a robust,easy and unambiguous technique to distinguish leather from leather-like materials currently available on the market.

Thoughts on Strategic Development of China's Refractories I ndustry

For China ' s refractories industry, the first two decades in the new century would be a period of structural optimization with reorganization of refractories enterprises, reconstruction of manufacturing plants and restructuring of product varieties. An important strategic measure should be to develop high quality synthetic raw materials and high performance functional products mainly based on our rich natural resources to cope with new demands of advanced high temperature technologies.

An approach towards identification of leather from leather-like polymeric material using FTIR-ATR technique

Leather,a by-product of the meat industry,has unique strength,elasticity,water vapor permeability,resistance to abrasion,durability,and longevity.In the background of ISO 15115:2019,the authenticity of leather has become a subject matter of concern.There is a need to distinguish leather(animal origin)from other leather-like materials derived from fossil fuel(PU,faux leather,etc.)and agro-product-driven vegan materials,which are also sold in the market as leather.For this purpose,this work relies on the signature FTIR bands of collagen(the skin-making protein)as a starting point to distinguish between animal origin and rest.A detailed investigation of all types of materials used in lifestyle products has been carried out to assess the boundary lines of this hypothesis.It is reasonably concluded that the signature AmideⅠ,Ⅱ,andⅢbands of collagen occurring at 1600,1500,and 1200 cm^(-1)could serve as the first line to distinguish against all materials other than nylon and in the case of nylon,and the Amide A band at 3200 cm^(-1),forms the basis for differentiation from nylon.In essence,the FTIR spectra can be used as a robust,easy and unambiguous technique to distinguish leather from leather-like materials currently available on the market.

Quantum dot biosensor combined with antibody and aptamer for tracing food-borne pathogens

Due to the increasing number of food-borne diseases,more attention is being paid to food safety.Food-borne pathogens are the main cause of food-borne diseases,which seriously endanger human health,so it is necessary to detect and control them.Traditional detection methods cannot meet the requirements of rapid detection of food due to many shortcomings,such as being time-consuming,laborious or requiring expensive instrumentation.Quantum dots have become a promising nanotechnology in pathogens tracking and detection because of their excellent optical properties.New biosensor detection methods based on quantum dots are have been gradually developed due to their high sensitivity and high specificity.In this review,we summarize the different characteristics of quantum dots synthesized by carbon,heavy metals and composite materials firstly.Then,attention is paid to the principles,advantages and limitations of the quantum dots biosensor with antibodies and aptamers as recognition elements for recognition and capture of food-borne pathogens.Finally,the great potential of quantum dots in pathogen detection is summarized.