Using Li_2CO_3,SiO_2,and K_2CO_3 as the starting materials,potassium-doped lithium silicate absorbents were prepared by high-temperature solid-state reaction.The influence of doping potassium on the crystal structure of the prepared absorbents was studied by comparison of their XRD patterns.The microscopic morphologies of absorbents with different K_2CO_3 content were viewed by sanning electron microscopy.Their CO_2-absorption abilities were measured with a thermogravimetric analyzer.The experimental results showed that doping of potassium could improve appreciably the CO_2-absorption ability of lithium silicate.It was found that lithium silicate absorbed as much as about 48%(weight ratio) of CO_2 under CO_2 atmosphere at 700?℃ within 15?min.

Preparation methods for hollow/porous microspheres and mechanism of pore formation are reviewed.The first part of this review is focused on the preparation of hollow microspheres(mainly by template method) while the second part is concentrated on porous microspheres(mainly by seed-swelling method and porogen method).The characteristics resulting from the different methods may determine their applications and often several methods are combined to be used for ideal properties.The advantages and disadvantages for each method involved are also analyzed.Meanwhile,existing problems and processing choice in preparation of hollow/porous microspheres are dicussed.

Along with green house effect increasingly and seriously,the research and development of CO2 solid absorbents at high temperature are concerned.Using Li2CO3,SiO2 as the starting materials and potassium carbonate as a doped,potassium-doped lithium silicate absorbents were prepared by high-temperature solid-state reaction.The crystal structure of Lithium Silicate was analyzed using an X-ray powder diffractometer(XRD),the surface morphologies of all the samples were observed by using scanning electron microscopy(SEM) and the CO2-absorption ability of Lithium Silicate was studied using a thermogravimetric(TG) analyzer.The experimental results show that :the first,doping of potassium could improve appreciably the CO2-absorption ability of Lithium silicate;the second,maintain the K doping amount for a certain value,there is a great difference between the CO2-absorption abilities of lithium silicate that prepared under different sintering temperature;the third,when the sintering temperature is 850℃,it was found that lithium silicate absorbed as much as about 49%(weight ratio) of CO2.It shows a good absorption performance.

Using N2as a doped source to prepare ZnO films,the N-doped ZnO films with strong(002) preferred orientation were deposited on quartz glass substrate by RF magnetron sputtering through changing the ration of O2∶N2.The result shows that the films have a main peak at 402nm;they have other peaks at 445nm,524nm with the different contents of N,and the intensity of the films are different too;the peak position also produced corresponding red shift or blue shift.When O2∶N2is 10∶15,the N doping amount of the film is the largest,and the optical performance is the best.The proposed research provides an important reference for the type of ZnO film defect and conductive.

Using Li2CO3,SiO2,and K2CO3 as the starting materials,the lithium silicate with different amounts of K that can absorbent CO2 at high temperature were prepared.Study on the influence of K elements on the structure and properties of lithium silicate ceramic materials,and explores the different amounts of K-doped lithium silicate ceramic materials for high temperature CO2 absorption properties.The crystal structure of lithium silicate was analyzed using an X-ray powder diffractometer(XRD),the surface morphologies of all the samples were observed by using scanning electron microscopy(SEM) and the CO2-absorption ability of lithium silicate was studied using a thermograviemetric(TG) analyzer.The experimental results show that: the rate of undoped lithium silicate for high temperature CO2 absorption is very small,and the doping of potassium could improve appreciably the CO2-absorption ability of lithium silicate.When the content of K is 0.01mol,the K-doped lithium silicate shows a good absorption performance,and it was found that lithium silicate absorbed as much as about 49.077wt% of CO2 under CO2 atmosphere at 700℃ within 20 min.

This article reviews the research progress in the area of antireflection coatings.The effectiveness in the antireflection of coatings is elaborated qualitatively and quantitatively with respect to various factors,such as the reflective index and thickness of the antireflection coatings as well as multiple layer coatings.The fabrication techniques of polymer-based antireflection coatings are especially addressed,and the perspective in terms of the market and future development in this field is also discussed.

The definition and mechanism of stress whitening in polymer materials were discussed and the factors that affected the stress whitening were highlighted.The emphasis of this paper was on reviewing the experimental methods for characterization,elimination,and healing of stress whitening.An outlook of the future research on the anti-stress whitening property in this area was also discussed.