AFM: MXene hydrogel skin sensor for intelligent human-machine interface and photothermal therapy 2024-02-04

The skin sensor based on conductive hydrogel is widely considered as a personalized health care prospect to bridge the gap between human and machine. However, achieving high levels at the same time remains challenging. Based on the sensitivity of hydrogel, wide sensing range and reliable cycle stability, it can be used for the skin sensor of ultra sensitive human-machine interface, as well as excellent anti swelling ability and near-infrared (NIR) light triggered dissociation and drug release, which can achieve further intelligent on-demand photothermal treatment.

Current situation and prospects of the non-ferrous metal industry: price increases, trade deficit continues to expand 2024-02-04

1、 Development environment: continuously introducing favorable policies to promote industry development All metals except iron, chromium, and manganese are called non-ferrous metals, which can be divided into light metals, heavy metals, precious metals, semimetals, and rare metals. Non ferrous metals are the fundamental materials for the development of the national economy. The upstream of the non-ferrous metal industry chain is mainly the mining of mineral resources, while the midstream of the industry chain is mainly the smelting and processing of non-ferrous metals. Currently, the integration level of China's smelting and processing end is relatively high, and the downstream of the industry chain is infrastructure construction, mechanical manufacturing, etc. 2、 Development status: Affected by the environment, prices have risen According to data released by the China Nonferrous Metals Industry Association, the production of ten common non-ferrous metals in China has shown an increasing trend year by year, driven by lower end demand and increased consumption, with a relatively high growth rate. The production of ten commonly used non-ferrous metals in 2022 was 67.936 million tons, an increase of 4.90% compared to the same period in 2021. In the first quarter of 2022, copper prices reached a historic high, but in the second quarter, prices rebounded due to the impact of the Federal Reserve's interest rate hike. In 2022, the annual average spot price of copper in China was 67470 yuan/ton, a decrease of 1.5% compared to the same period last year. The average annual spot price of aluminum in China in 2022 was 20006 yuan/ton, an increase of 5.6% compared to the previous year. The growth rate of China's non-ferrous metal import and export trade has accelerated in the past two years. According to customs statistics, the total amount of non-ferrous metal import and export trade in 2022 was 327.33 billion US dollars, an increase of 20.2% compared to the previous year. 3、 Enterprise landscape: fierce competition and high downstream pressure in the industry At present, the overall characteristic of competition in China's non-ferrous metal industry is fierce competition, with high downstream pressure on the industry chain. Due to the monopoly of some scarce metals by the state, there are fewer enterprises that can participate in competition, and the barriers to entry into the industry are relatively high. From the perspective of existing competitors in most segmented industries, the non-ferrous metal industry has strong resource characteristics, with a large number of non-ferrous metal enterprises distributed in resource intensive areas. In addition, China has a large reserve of copper, aluminum and other metal resources, which also encourages a large number of enterprises that mainly engage in related non-ferrous metal processing and smelting. 4、 Development trend: Green and intelligent reform, promoting industrial upgrading With the increasing awareness of environmental protection, the non-ferrous metal industry will increasingly focus on sustainable development and environmental protection. Traditional non-ferrous metal production is often accompanied by a large amount of energy consumption and environmental pollution, but now more and more enterprises are adopting clean production technology to reduce energy consumption and waste emissions. With technological innovation, recycling non-ferrous metals from waste such as electronic devices and vehicles has become more feasible. Recycling not only helps to reduce environmental burden, but also reduces dependence on raw ores. Digital technology has had a huge impact in various fields, and the non-ferrous metal industry is no exception. The application of intelligent manufacturing and Internet of Things technology can improve production efficiency, reduce production costs, and achieve precise control of the production process. The non-ferrous metal industry has a high degree of internationalization, and global market fluctuations and policy changes can have an impact on the industry. International cooperation and supply chain optimization will help reduce risks and jointly address market challenges. Through cooperation methods such as technological exchange and resource sharing, enterprises can better adapt to market changes.

Preparation and properties of Ti (C, N) based ceramic composites by hot pressing sintering 2024-02-04

Titanium carbide nitride (Ti (C, N)) based ceramic composites were prepared by hot pressing sintering process. The fracture and surface morphology of the samples were analyzed using field emission scanning electron microscopy (SEM).Don't observe, the mechanical properties were tested and its antioxidant performance was studied. The research results show that the microstructure, morphology, and density of the sample's fracture surface are high, and the number of pores is high.Few, with clear grain boundaries and small grain size. The fracture path of the crack is clear and uneven, and there are both transgranular and transgranular fracture modes. The mechanical properties are: bending strength 1255 MPa, fracture toughness 8.3 MPa · m1/2, Vickers hardness 11.9 GPa, relative density 98.7%. After oxidation for 2 hours under the set temperature conditions, no oxidation was formed at 750 ℃. Membrane layer; At 900 ℃, the oxide film formed on the surface of the sample has no protective effect on the substrate; At 1150 ℃, a dense protective layer was formed on the surface of the sample, which had a protective effect on the matrix. The thickness of the oxide film layer and intermediate transition layer is approximately 73.81 μ m. And the thickness of the intermediate transition layer is about 18.57 μ M.

oron carbide: a bulletproof ceramic material with excellent comprehensive performance 2022-01-12

In recent years, advanced ceramics have shown great brilliance in the military arena. With high specific stiffness, high specific strength and chemical inertness in many environments, protective armor made of advanced ceramics is an essential part of the armor system due to its high resistance to intrusion, lightness and comfort.