Analysis on the Nanomaterial Application in the Industry of Food Packaging

In the paper, the application of all kinds of nanometer materials to the food packaging has been reviewed comprehensively. In the meantime, the advantages of these nanomaterials adopted in the food packaging has been generalized. Moreover, the toxicity of nanomaterials that might affect different organelle or cell has been summarized and analyzed.

The effect of nano-SiO2 on concrete properties: a review

In recent years, the addition of nanometer materials to concrete materials has attracted a group of increasing number of scholars’ research interests, and nano-SiO2 is one of the research hotspots. In this paper, we briefly introduce the influence of nano-SiO2 on setting time, slump, shrinkage, durability and mechanical properties of concrete. In addition, this review also includes the microstructure measured by scanning electron microscope (SEM) and the content of various hydration products obtained by X-ray diffraction (XRD). The result shows that the setting time of nano-SiO2 concrete is shortened, the slump is reduced and the shrinkage is improved owing to the high activity and nucleation of nano-SiO2. The improvement effect of nano-SiO2 on concrete is remarkable, especially in the aspect of enhancing the durability of concrete. It should be noted that nano-SiO2 shows limited improvement in the mechanical properties of concrete. In the end, this literature summary explains the macro performance of nano-silica modified concrete through microstructure.

The Analysis of the Characteristic Development of Material Chemistry Specialty under the Background of "Big Materials"

<p>With the rapid development of science and technology, the material discipline also developed rapidly, and gradually developed a lot of new materials. With the emergence of new materials, there are many specialties such as nanometer materials and technology, functional materials, new energy materials and devices. The material chemistry major is a kind of material and chemistry cross traditional major. The teaching purpose of material chemistry major is to improve students' knowledge and skills in material chemistry, so that they can carry out scientific research, teaching, development and other management work in engineering, material science and other related industries, and become an innovative talent in the field of material science. At present, in the environment of rapid development of large materials, the most prominent problem of material chemistry major is how to highlight the specialty characteristics as much as possible in this environment, so as to realize the construction and development of specialty characteristics.</p>

Nanometer Materials & Nanotechology and T heir Application Prospect

Due to the unique surface effect, volume effect and quantum size effect of nanomaterials, the electrical, mechanical, magnetic, optical and other properties of the materials have produced amazing changes. At present, nanotechnology has become one of the hotspots of scientific research. The application of nanotechnology in the future will far exceed the computer industry or genetic medicine, and become the core of the information age in the 21st century. The thesis introduced in detail the characteristics of nanomaterials and the broad application prospects of nanotechnology in the fields of electronics, ceramics and chemical engineering.

Evolution Mechanism of Metallic Dioxide MO2 (M = Mn, Ti) from Nanorods to Bulk Crystal: First-Principles Research

Using first-principle calculations, the surface energy, cohesive energy, and electronic properties of α-MnO2 and rutile TiO2 nanorods and microfacets were investigated and clarified to, in the first instance, determine the evolution mechanism. The results show that the surface energies of α-MnO2 nanorods and microfacets conform to function 1.0401 Jm−2 + N × 0.608 Jm−2, while the surface energies of the rutile TiO2 nanorods and microfacets are governed by a 1.0102 × 1.1997 rule. Their electronic properties, such as the Mulliken population and Mulliken charge, can only be normalized by their surface areas to attain a linear function. Meanwhile, the surface energy of α-MnO2 with the nanostructure closely conforms to the function for normalized Mulliken population and Mulliken charge as f(x)=102.9×x+0.101 with an R2 value of 0.995. Thus, our research into the evolution mechanism affecting the surface effect of nanometer materials will be useful for investigating the intrinsic mechanism of the nanometer effect and doping process of metallic dioxide catalysts.