Jinsong Shi,Hongmin Cui,Jianguo Xu,Nanfu Yan,Chao Zhang,Shengyong You
Porous carbon with specifically designed structure as CO 2 adsorbent is a very attractive and interesting research topic. In this study, we presented the synthesis and CO 2 adsorption of flower shaped porous carbons. Flower-like hydrochar derived from the hydrothermal reaction of glucose, cobalt sulfate, and hexamethylenetetramine was used as the precursor, which was converted to carbon flower during CO 2 activation. The flowers had hierarchically macro-meso-microporous structure. Interspaces and voids were formed by assembly of the petals, and the petals were distributed with pores of different scales. The formation mechanism of, and influences of various synthesis parameters on the flower shape were studied and analyzed. The carbon flowers exhibited surface area of 422−691 m 2 /g, and very high nitrogen content of 9.31–11.91 wt%. CO 2 adsorption performances of the carbon flowers were also studied. Influences of the textural properties and doped nitrogen on the adsorption performances were investigated. The experiment results demonstrated that nitrogen doping showed positive effects on CO 2 uptake at 1 bar, and had strong influence on the CO 2 /N 2 selectivity.
Herein, a simple, innovative, and efficient method is presented for synthesizing an electromagnetic wave (EMW)-absorbing material with a distinctive flower–ball structure. Acrylonitrile (AN)–styrene binary polymer microspheres (PAS) serve as seeds for the deposition of AN, forming petal-like structures and yielding uniform polymer flower balls (PAS&A-F). Carbonization of these flower balls produces PAS&A carbon flowers (PAS&A-CF) with excellent EMW absorption properties. PAS&A-CF carbonized at 800 °C exhibits a minimum reflection loss of −54.0 dB at a thickness of 2.92 mm and an optimal effective absorption bandwidth of 4.01 GHz. This exceptional performance is attributed to the unique petal-like cross-stacked flower–ball morphology, porous structure, N and O atom doping, and an appropriate degree of graphitization. These characteristics synergistically enhance impedance matching, multiple scattering and reflection, dipole polarization, and conductive loss. This straightforward, innovative, and highly efficient preparation approach, with precise control over surface morphology and temperature, offers a novel approach for developing high-performance EMW-absorbing materials.
Yang Xiao-Guang,Li Yan-Feng,Wang Yan-Jun,Kong Rui-Heng,Wang Dun
Recent studies have shown that monoamine oxidase A (MAOA) is significantly expressed in malignant prostate cancer (PCa) and plays an important role in tumorigenesis indicating its potential to serve as a target for PCa treatment. Here, we choose the small molecule isoniazid as the MAOA
inhibition functionality and incorporated it in the tumor-targeting moiety of heptamethine carbocyanine dyes via a pH sensitive hydrazone bond to design and synthesize novel MAOA inhibitor isoniazid-heptamethine carbocyanine dye conjugates. Cytotoxicity assay in PC-3 cells shows that
all conjugates possessed improved antitumor efficacy compared with isoniazid. The tested compounds also demonstrated a moderate MAOA inhibitory effect. In conclusion, these results indicate that these conjugates exert antitumor effects by delivering the MAOA-inhibiting moiety to PCa cells.
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