Titanium oxide (anatase) particles were prepared using selective Ba leaching from BaTiO3. The anatase powder was flaky. Its photocatalytic activity for the decomposition of gaseous 2-propanol (IPA) was improved by grafting tungsten-based Keggin-type heteropolyacids (PW12: ([PW12O40]3−). PW12-grafted anatase powder immobilized onto Pyrex glass plates with amorphous TiO2 exhibited better retention of the UV induced hydrophilicity than the pure anatase. Results suggest that the electron scavenger property of PW12 plays an important role in the overall photocatalytic performance of the material.
The combination of organic-inorganic polymer hybrids with the recent development of nano-sized inorganic blocks has enabled the realization of element-block polymers. These kind of materials are regarded as single component hybrid materials, an extension of the concept of “organic-inorganic hybrid polymers”. Functionalized polyhedral oligomeric silsesquioxane (POSS)-core dendrimers and dumbbell- and starshaped POSS derivatives are described herein as examples of element-block polymers.
Universal techniques for material surface modification are required, since material surfaces have a strong influence on their properties, e.g., adhesion, electrical properties, and biocompatibilities. Recently, catecholic polymers that are inspired from nature have been of interest in many fields, because of their adhesion property onto various types of materials. In this review, we focus on catecholic polymers, i.e., polydopamine, urushi, and plant polyphenol-based films, which have emerged as new methods for universal surface-modification. We also describe the preparation of polydopamine particles and their use as a structural color material. We hope that these novel methods based on catecholic polymers for the fabrication of functional surfaces and materials will contribute to the progress of many processes.
The necessary for surface treatment of metals and adhesive bonding was reviewed. Adhesive bonding replace with weld bonding in industory, its has many merits and demerits, then need to minimize that demerits. To increase initial adhesive strength and to decrease range of strength variation need some surface treatment. Meny process of surfase treatmens was deveroped, now take notes of dry-washing used active gas to metals.
Basic corrosion theory which has been developed based on electrochemistry is described with focusing the potential-pH diagram and the electrode kinetics to understand the corrosion process of iron and steel. The importance of oxygen reduction and inhibitive function of corrosion film on the steel surface in neutral solution is pointed out for understanding corrosion phenomena experienced in daily life. Close relationship between air pollution and steel corrosion is demonstrated. Development of weathering steel contributes for improving the atmospheric corrosion. Highly protective property of the passive film on stainless steel is described.