While the "nano" technology is being developed more and more widely, people may ask the question: What kind of "nanometer" is the scientific method used to detect it? After more than 20 years of research, Prof. Fang Keming from Beijing University of Science and Technology has explored a new method———
The term "nano" is increasingly attracting people's interest. Everyone knows that "nano" is a very tiny unit of length. Specifically, a nanometer is about one ten-thousandth of the thickness of a hair. The application of nanotechnology to traditional products will greatly improve the performance of the product. For example, carbon nanotubes are tubular "fibers" that are curled from one or several layers of carbon atoms and are only a few to a few tens of nanometers in diameter. The specific gravity is only one-sixth that of steel, but its strength is 100 times that of steel. If the carbon nanotubes are made into ropes, they are the only ropes that are hung from the moon to the surface of the earth and are not broken by their own weight.
While the "nano" technology is being developed more and more widely, people may ask the question: What kind of "nanometer" is the scientific method used to detect it? It is understood that the nanometer characterization technology used to detect nanometers in China is becoming more mature and has made new breakthroughs.
The reporter recently learned from an interview that Prof. Fang Keming, a doctoral supervisor of the School of Metallurgy, Beijing University of Science and Technology, after more than 20 years of research, has made new breakthroughs in nanometer characterization technology and explored the use of transmission electron microscopy or high resolution electron microscopy for nanomaterials. The new method of characterization. This technique uses metal embedding to cut nanoscale films from nanomaterials, and then uses transmission electron microscopy or high-resolution electron microscopy to study the micromorphology and microstructure of nanomaterials. The success of this technology has provided an important detection method for the development of nanotechnology in China. It won the gold medal of the 12th National Invention Exhibition and obtained national patents. It is currently at the leading level in this field at home and abroad.
Nanomaterials include nanoparticles and their nanoparticle-based materials; nanofibers and materials containing nanofibers; nanointerfaces and materials containing nanointerfaces. The performance of nanomaterials has an important relationship with its microstructure. Therefore, it is of great significance to study the characterization of nanostructured materials to understand the characteristics of nanomaterials and promote the application of nanomaterials.
Transmission electron microscopy is one of the important instruments for studying materials, and it is no exception in the basic research and development and application of nanotechnology. However, when the microstructure of the material is studied by transmission electron microscopy, the sample must be a thin film of nanometer thickness that can be penetrated by the electron beam of the transmission electron microscope. The monomeric nano-particles or nano-fibers are generally permeable to electron beam transmission electron microscopy. Researchers usually place the sample directly on the microgrid for transmission electron microscopy. However, due to the easy agglomeration of nanoparticles or nanofibers, the desired results are often not obtained with this method, and some studies are difficult to implement. For example, studies on the surface modification of nanoparticles, cross-section studies of nanofibers are more difficult, and interface problems are more difficult to study. Therefore, the TEM study of nanomaterials is an important issue that is worth exploring. In this regard, Professor Fang Keming conducted a study and explored a more suitable method of sample preparation. The method can directly cut the thin film that can be studied by the transmission electron microscope from the nano-particles or the micro-particles, and has high efficiency in the preparation of the nanofiber cross-section observation or the nano-interface observation.
This technique is characterized by the direct cutting of thin films for transmission electron microscopy (TEM) or high resolution electron microscopy (SEM) from nano- or micro-scale specimens. The sample may be a simple particle or a surface-modified coated particle. For a fibrous sample, either a cross-section film or a longitudinal section film may be cut. For samples or nanomultilayers containing interfaces, this technique can be used to prepare transmission electron microscope specimens for studying interface structures. Another important feature of the technique is that it does not damage the original tissue of the specimen. High temperature is not used in the film making process, and it is not exposed to acids and bases. If necessary, it may not be exposed to water or an aqueous solution.
At present, the above technologies have been applied to a number of research projects, such as: the assembly of semiconducting nanoclusters in zeolite particles; the high-resolution electron microscopy of nanocarbon fiber microstructures; the characterization of nanostructures and microstructures; and the structure of multilayer membranes The study of transmission electron microscopy; research on the surface modification of powder particles; the study of oxygen-permeating layer and dielectric film of capacitive powder particles; the study of various graphite microstructures in cast iron.
The technology has been widely used throughout the country, providing technical support for Peking University, Tsinghua University, Chinese Academy of Sciences and other hundreds of new materials research group and companies. It has provided an important method for the in-depth study of high-tech materials in China and has attracted attention at home and abroad.
Nanometer characterization technology is a cross-fusion technology for the basic theoretical research and practical application of high-tech materials. It has an important role in promoting the development of China's high-tech materials industry. We hope that this new technology will receive the attention of relevant departments and be more widely applied throughout the country to accelerate the progress of China's high-tech materials research and make greater contributions to the development of China's high-tech industries.
The term "nano" is increasingly attracting people's interest. Everyone knows that "nano" is a very tiny unit of length. Specifically, a nanometer is about one ten-thousandth of the thickness of a hair. The application of nanotechnology to traditional products will greatly improve the performance of the product. For example, carbon nanotubes are tubular "fibers" that are curled from one or several layers of carbon atoms and are only a few to a few tens of nanometers in diameter. The specific gravity is only one-sixth that of steel, but its strength is 100 times that of steel. If the carbon nanotubes are made into ropes, they are the only ropes that are hung from the moon to the surface of the earth and are not broken by their own weight.
While the "nano" technology is being developed more and more widely, people may ask the question: What kind of "nanometer" is the scientific method used to detect it? It is understood that the nanometer characterization technology used to detect nanometers in China is becoming more mature and has made new breakthroughs.
The reporter recently learned from an interview that Prof. Fang Keming, a doctoral supervisor of the School of Metallurgy, Beijing University of Science and Technology, after more than 20 years of research, has made new breakthroughs in nanometer characterization technology and explored the use of transmission electron microscopy or high resolution electron microscopy for nanomaterials. The new method of characterization. This technique uses metal embedding to cut nanoscale films from nanomaterials, and then uses transmission electron microscopy or high-resolution electron microscopy to study the micromorphology and microstructure of nanomaterials. The success of this technology has provided an important detection method for the development of nanotechnology in China. It won the gold medal of the 12th National Invention Exhibition and obtained national patents. It is currently at the leading level in this field at home and abroad.
Nanomaterials include nanoparticles and their nanoparticle-based materials; nanofibers and materials containing nanofibers; nanointerfaces and materials containing nanointerfaces. The performance of nanomaterials has an important relationship with its microstructure. Therefore, it is of great significance to study the characterization of nanostructured materials to understand the characteristics of nanomaterials and promote the application of nanomaterials.
Transmission electron microscopy is one of the important instruments for studying materials, and it is no exception in the basic research and development and application of nanotechnology. However, when the microstructure of the material is studied by transmission electron microscopy, the sample must be a thin film of nanometer thickness that can be penetrated by the electron beam of the transmission electron microscope. The monomeric nano-particles or nano-fibers are generally permeable to electron beam transmission electron microscopy. Researchers usually place the sample directly on the microgrid for transmission electron microscopy. However, due to the easy agglomeration of nanoparticles or nanofibers, the desired results are often not obtained with this method, and some studies are difficult to implement. For example, studies on the surface modification of nanoparticles, cross-section studies of nanofibers are more difficult, and interface problems are more difficult to study. Therefore, the TEM study of nanomaterials is an important issue that is worth exploring. In this regard, Professor Fang Keming conducted a study and explored a more suitable method of sample preparation. The method can directly cut the thin film that can be studied by the transmission electron microscope from the nano-particles or the micro-particles, and has high efficiency in the preparation of the nanofiber cross-section observation or the nano-interface observation.
This technique is characterized by the direct cutting of thin films for transmission electron microscopy (TEM) or high resolution electron microscopy (SEM) from nano- or micro-scale specimens. The sample may be a simple particle or a surface-modified coated particle. For a fibrous sample, either a cross-section film or a longitudinal section film may be cut. For samples or nanomultilayers containing interfaces, this technique can be used to prepare transmission electron microscope specimens for studying interface structures. Another important feature of the technique is that it does not damage the original tissue of the specimen. High temperature is not used in the film making process, and it is not exposed to acids and bases. If necessary, it may not be exposed to water or an aqueous solution.
At present, the above technologies have been applied to a number of research projects, such as: the assembly of semiconducting nanoclusters in zeolite particles; the high-resolution electron microscopy of nanocarbon fiber microstructures; the characterization of nanostructures and microstructures; and the structure of multilayer membranes The study of transmission electron microscopy; research on the surface modification of powder particles; the study of oxygen-permeating layer and dielectric film of capacitive powder particles; the study of various graphite microstructures in cast iron.
The technology has been widely used throughout the country, providing technical support for Peking University, Tsinghua University, Chinese Academy of Sciences and other hundreds of new materials research group and companies. It has provided an important method for the in-depth study of high-tech materials in China and has attracted attention at home and abroad.
Nanometer characterization technology is a cross-fusion technology for the basic theoretical research and practical application of high-tech materials. It has an important role in promoting the development of China's high-tech materials industry. We hope that this new technology will receive the attention of relevant departments and be more widely applied throughout the country to accelerate the progress of China's high-tech materials research and make greater contributions to the development of China's high-tech industries.
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