TAILIEUCHUNG - Solar Collectors and Panels, Theory and Applications_2

The title of this book was specifi cally chosen to encompass all the chapters presented in the book. Solar collectors and panels have become household and industrial items being used for power production, heating, cooling and are even being used for outer space research because of their environmentally friendly nature. | 11 Titanium Dioxide Nanomaterials Basics and Design Synthesis and Applications in Solar Energy Utilization Techniques Fuqiang Huang Yaoming Wang Jianjun Wu and Xujie Ltì Shanghai Institute of Ceramics Chinese Academy of Sciences People s Republic of China 1. Introduction Titanium dioxide TiO2 nanomaterials have been extensively studied in the last two decades. Due to their versatile properties TiO2 nanomaterials have possessed themselves vast applications including paint toothpaste UV protection photocatalysis photovoltaics sensing electrochromics as well as photochromics. An in-depth study of the basic material properties electrical transport-favored nano micro-structure design and processing of TiO2 nanomaterials will be present in this chapter focusing on solar energy utilization efficiency enhancement. 2. Basics and design A criterion for ranking the charge separation abilities of semiconductors Nanomaterials used for gathering solar energy inevitably involve charge transport process and solar energy utilization efficiency often comes down due to the difficulty of charge separation in many material systems TiO2 nanomaterials are not exceptional. How to evaluate the charge separation transport abilities of TiO2 and other semiconductors is an urgent question to be answered. Solving this problem will give an insight into intrinsic nature of compounds and bring great convenience to material device design. Here we have developed the packing factor PF concept to evaluate inherently existing internal fields that can be used to rank the charge separation abilities among oxide materials Lin et al. 2009 . The concept is based on the idea that lower elastic stiffness can promote distortion which promotes internal field and it can be easily implemented using the packing factor. This packing factor model is a broadly applicable criterion for ranking charge seperation transport and photocatalytic ability of the materials with similar chemistry or structure. Lower PF .

• Cơ khí - Chế tạo máy
• Handbook of mechanical engineering
• mechanical engineering
• mechanical design
• mechanical materials
• alloy materials
• Energy Technology
• Mechanical engineering handbook
• Mechanics of solids
• Engineering thermodynamics
• fluid mechanics
• Heat and mass transfer
• Electrical engineering
• Mechanical system controls
• Energy resouces
• Energy conversion
• Electronic packaging technologies
• Engineering design
• Environmental engineering
• materials engineering
• instructions for mechanical engineering exam
• robotics