Shenzhen Turing New Material Co., Ltd.
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Shenzhen Turing New Materials Co., Ltd. (abbreviated as: Turing New Materials) is located in Bao'an District, Shenzhen, with a registered capital of 31 million yuan. The company was initiated by Mr. Zhao Ping, a winner of the National Second Prize for Progress in Science and Technology, and Professor Chen Hua, a well-known Chinese expert in single-layer graphene oxide. It is a leading enterprise in single-layer graphene oxide, integrating the research and development, production, sales and application development of graphene. It ranks among the top in the industry in terms of technical level and brand popularity. It has successively been recognized as a "High-Tech Enterprise", a talent unit of Shenzhen's "Double Hundred Plan", and a "Pilot Innovative Enterprise" in Shenzhen. It has passed the ISO9001 quality management system certification and is a director unit of the Graphene Industry Technology Innovation Strategic Alliance, a director unit of the Guangdong Graphene Industry Technology Promotion Association, and a vice-chairman unit of the Shenzhen New Materials Association.
Turing New Materials firmly grasps the core technologies in graphene production and application, and is an enterprise engaged in the production of graphene powder using the physical method. All of the company's graphene products have independent intellectual property rights. It has applied for more than 40 graphene invention patents, and has obtained 21 national invention patent authorizations, 2 utility model patent authorizations, and two registered trademarks.
The company has carried out a lot of pioneering work in the graphene industry. The company's team launched a graphene commercial R&D project in 2006. The team of the graphene commercialization project released China's graphene products and graphene enterprise standards in 2009, and is now actively participating in the drafting of industrial and national standards for graphene. In 2010, Turing's pricing of graphene at 5,000 yuan per gram was called "graphene being 15 times more expensive than gold". In 2015, Turing Technology made a technological breakthrough, reducing the price of graphene powder to less than 1 yuan per gram, and it also built China's first graphene powder production line with an annual capacity of 5,000 tons, solving the industry problem of high production costs of graphene. The physical method for graphene production independently developed by Turing Technology solves the problems of waste acid and wastewater in graphene production, realizing clean production. Up to now, Turing Technology has developed the sixth-generation technology for producing graphene powder, achieving environmentally friendly, low-cost, large-scale mass production of high-quality graphene.
Graphene can be widely applied in many fields such as new energy batteries, marine engineering, composite materials, thermal conductive materials, supercapacitors, seawater desalination, and biomedicine. In 2014, the company innovatively proposed the "Graphene+" concept, introducing graphene into application fields such as new energy, high-performance composite materials, and coatings, thus opening up a new situation for graphene applications. It has now launched graphene conductive agents dedicated to lithium batteries, graphene products dedicated to rubber and plastics, and graphene products dedicated to anti-corrosion coatings. Turing Company's graphene conductive agents for lithium batteries have been successfully introduced into many domestic new energy vehicle battery enterprises, and graphene is entering our lives.
Turing New Materials adheres to the corporate spirit of "Unlimited Innovation, Striving for Perfection" and is creating a new chapter in the innovative application of graphene.
Graphene oxide is an oxide of graphene, with a brownish-yellow color. Common products available on the market include powder, flake, and solution forms. After oxidation, the number of oxygen-containing functional groups on it increases, making its properties more active than those of graphene. Its own properties can be improved through various reactions with oxygen-containing functional groups.
Graphene oxide sheets are products obtained by chemical oxidation and exfoliation of graphite powder. Graphene oxide consists of a single atomic layer, which can be extended to tens of micrometers in lateral size at any time. Therefore, its structure spans the typical scales of general chemistry and materials science. Graphene oxide can be regarded as an unconventional type of soft material, possessing the characteristics of polymers, colloids, films, and amphiphilic molecules. Graphene oxide has long been considered a hydrophilic substance due to its excellent dispersibility in water. However, relevant experimental results show that graphene oxide is actually amphiphilic, with a property distribution from hydrophilic to hydrophobic from the edge to the center of the graphene sheet. Thus, graphene oxide can exist at interfaces like surfactants and reduce the energy between interfaces. Its hydrophilicity is widely recognized.
After oxidation treatment, graphite oxide still retains the layered structure of graphite, but many oxygen-containing functional groups are introduced onto each graphene sheet in the layers. The introduction of these oxygen-containing functional groups makes the structure of a single graphene sheet very complex. Given the position of graphene oxide in the field of graphene materials, many scientists have attempted to provide a detailed and accurate description of the structure of graphene oxide to facilitate further research on graphene materials. Although methods such as computer simulation, Raman spectroscopy, and nuclear magnetic resonance have been used to analyze its structure, the precise structure of graphene oxide has not yet been determined due to various reasons (different preparation methods, differences in experimental conditions, and different graphite sources all have certain impacts on the structure of graphene oxide). The generally accepted structural model is that hydroxyl and epoxy groups are randomly distributed on the graphene oxide sheet, while carboxyl and carbonyl groups are introduced at the edges of the sheet. Recent theoretical analyses have shown that the surface functional groups of graphene oxide are not randomly distributed but have a high degree of correlation.
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Graphene oxide is generally obtained by oxidizing graphite with strong acids. There are three main methods for preparing graphite oxide: the Brodie method, the Staudenmaier method, and the Hummers method. Among them, the Hummers method is currently the most commonly used due to its relatively better timeliness in the preparation process and higher safety. It involves an oxidation reaction between potassium permanganate in concentrated sulfuric acid and graphite powder, resulting in brown graphite flakes with derived carboxylic acid groups at the edges and primarily phenolic hydroxyl and epoxy groups on the plane. These graphite flake layers can be exfoliated into graphene oxide through ultrasonic treatment or high-shear vigorous stirring, forming a stable, light brown-yellow single-layer graphene oxide suspension in water. Due to the severe functionalization of the conjugated network, graphene oxide flakes exhibit insulating properties. They can be partially reduced through reduction treatment to obtain chemically modified graphene flakes. Although the final graphene product or reduced graphene oxide has many defects, leading to lower conductivity compared to pristine graphene, this oxidation-exfoliation-reduction process can effectively make insoluble graphite powder processable in water, providing a way to produce reduced graphene oxide. Moreover, due to its simple process and solution processability, in industrial processes considering mass production, the above-mentioned process has become a highly attractive process for manufacturing graphene-related materials and components.
To this day, new methods for preparing graphene oxide have emerged one after another, which can be roughly divided into two categories: top-down methods and bottom-up methods. The former approach involves splitting flake graphite and other materials to prepare graphene oxide, represented by improved versions of the traditional three methods, and also includes methods such as splitting (breaking) carbon nanotubes. The latter refers to methods of synthesizing using various carbon sources, with specific methods being diverse and numerous.
Application
The application range of materials is very wide. Graphene oxide is a new type of carbon material with excellent performance, featuring a high specific surface area and abundant surface functional groups. Graphene oxide composites, including polymer-based composites and inorganic composites, have even broader application fields. Therefore, the surface modification of graphene oxide has become another research focus.
The Shanghai Institute of Applied Physics, Chinese Academy of Sciences, found that applying graphene oxide in PCR technology can significantly improve the specificity, sensitivity, and amplification yield of PCR. It can also eliminate primer dimers formed during amplification, with a wide optimization range, and can be widely applied to DNA templates of various concentrations and complexities. Compared with other carbon nanomaterials that have been used in PCR technology, graphene oxide has a more excellent comprehensive effect on PCR optimization.
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