Search

• Cu 9 S 5 /coal gasification fine slag(CGFS) composites were synthesized via a simple one-step hydrothermal method. • Utilizing collaborative components and interface engineering to address the issue of excessive electrical conductivity in CGFS. • Composites could exhibit excellent EM wave absorption and achieve radar stealth effect. • This work provides a reference for the development of green and sustainable EMW absorbing materials. The optimized design of industrial waste coal gasification fine slag (CGFS) using component synergy and interface engineering to limit the high conductivity problem of CGFS is important for the development of green and sustainable electromagnetic wave (EMW)-absorbing materials. Herein, polyhedral Cu 9 S 5 /CGFS composites were designed using a simple one-step hydrothermal method via compositional synergies and interface engineering. The results show that the composites have multiple polarization behaviors and excellent impedance matching properties and reflection loss capability. A minimum reflection loss of -25.01 dB, an effective absorption bandwidth of 3.52 GHz, and a radar wave attenuation value of 16.2 dBm2 was achieved at a thickness of 1.4 mm, and even at a thickness of 2.1 mm, the minimum reflection loss value was as high as -56.56 dB. This work provides a reference for the development of green EMW-absorbing materials and promotes the recycling of solid waste CGFS. Cu 9 S 5 /coal gasification fine slag(CGFS) composites were synthesized via a hydrothermal synthesis method. The issue of excessive electrical conductivity in CGFS is solved by using collaborative components and interface engineering. The composites can effectively exhibit excellent EM wave absorption and achieve radar stealth effect. The minimum reflection loss is -25.01 dB and the effective absorption bandwidth can reach 3.52 GHz at a thickness of 1.4 mm, and a radar wave attenuation value of 16.2 dBm2 is achieved. Even at a thickness of 2.1 mm, the minimum reflection loss value is as high as -56.56 dB. This work provides a reference for the development of green and sustainable EMW absorbing materials. [Display omitted] [ABSTRACT FROM AUTHOR]

We connected the two ends of a finite spin-1/2 antiferromagnetic Ising chain with a magnetic impurity at one end to form a closed ring, and studied its magnetic susceptibility exactly by using the transfer matrix method. We calculated the magnetic susceptibility in the whole temperature range and gave the phase diagram at ground state of the system about the anisotropy of the impurity and strength of the connection exchange interaction for spin-1 and -3/2 impurities. We also gave the ground state entropy of the system and derived the asymptotic expression of the magnetic susceptibility multiplied by temperature at the zero-temperature limit and the high-temperature limit. It was found that a degenerate phase may exist in some parameter region at zero temperature for the odd spin number system, and the ground state entropy is ln(2) in the nondegenerate phase and is dependent on the spin number in the degenerate phase. The magnetic susceptibility of the system at low temperature exhibits ferromagnetic behavior, and the Curie constant is related to the spin configuration at ground state. When the ground state is nondegenerate, the Curie constant is equal to the square of the net spin, regardless of the parity of the number of the spin. When the spin number is odd and the ground state is degenerate, the Curie constant may be related to the total spin number. At the high-temperature limit, the magnetic susceptibility multiplied by temperature is related to the spin quantum number of the impurity and the spin number in the ring. [ABSTRACT FROM AUTHOR]

Natural microbial sensing circuits can be rewired into new gene networks to build living sensors that detect and respond to disease‐associated biomolecules. However, synthetic living sensors, once ingested, are cleared from the gastrointestinal (GI) tract within 48 h; retaining devices in the intestinal lumen is prone to intestinal blockage or device migration. To localize synthetic microbes and safely extend their residence in the GI tract for health monitoring and sustained drug release, an ingestible magnetic hydrogel carrier is developed to transport diagnostic microbes to specific intestinal sites. The magnetic living hydrogel is localized and retained by attaching a magnet to the abdominal skin, resisting the peristaltic waves in the intestine. The device retention is validated in a human intestinal phantom and an in vivo rodent model, showing that the ingestible hydrogel maintains the integrated living bacteria for up to seven days, which allows the detection of heme for GI bleeding in the harsh environment of the gut. The retention of microelectronics is also demonstrated by incorporating a temperature sensor into the magnetic hydrogel carrier. [ABSTRACT FROM AUTHOR]

As the most promising anode material for ultra-high specific capacity lithium-ion batteries, Si has been hindered from widespread use by large volume effects and limited electrical conductivity during cycling. In this study, NiO nanoflowers were coated onto the exterior of Si NPs by hydrothermal method. Si@NiO was then mixed and annealed with natural biomass gel extracted from moldy wheat to produce Si@NiO@Biochar ternary composites, which were prepared. Si NPs are the source of high specific capacity of anode materials. The carbon layer minimizes the electrode bulk effect and enhances cycling stability, while the NiO flowers expand the lithium-ion transport channel and reduce Si NPs bulk effect. Furthermore, the N element from wheat protein in the carbon layer enhances the electrical conductivity of the material. After 100 cycles at 0.1 A g−1 and 1000 cycles at 1 A g−1, the capacity of the electrode rose to 952.12 mAh g−1 and 1098.05 mAh g−1, respectively. The Si@NiO@Biochar material showed remarkable electrochemical stability at various current densities and the thickness grew by just 27.97% after 500 cycles. It can also be utilized in lithium-sulfur batteries because of its microporous structure and capacity to transport sulfur. The reversible capacity was 388.21 mAh g−1 after 70 cycles at 1 C. Biomass carbon from biomass gels coated on Si@NiO reduces biomass energy waste. This research is a significant step for commercializing Si anode materials and providing an eco-friendly new method for storing energy. [Display omitted] • Nitrogen-doped biochar is made from the recycling of mouldy wheat. • The simple preparation process and excellent results. • The volume expansion of the silicon is well limited. • The composite has low internal resistance and high cycle life. • It can be used in two scenarios: lithium batteries and lithium- sulfur batteries. [ABSTRACT FROM AUTHOR]