An effcient method for the synthesis of imidazole derivatives by a three-component condensation of benzil or 9,10-phenanthrenequinone,aldehydes and ammonium acetate using supported ionic liquidlike phase（SILLP）catal...An effcient method for the synthesis of imidazole derivatives by a three-component condensation of benzil or 9,10-phenanthrenequinone,aldehydes and ammonium acetate using supported ionic liquidlike phase（SILLP）catalyst under ultrasonic irradiation or classical heating conditions is reported.The present methodology offers several advantages,such as excellent yields,simple procedures,short reaction times,simple work-up and mild conditions.The catalyst is easily separated from the products by fltration and also exhibits remarkable reusable activity.These highly substituted imidazoles were also evaluated for their anti-microbial activity.展开更多
In this work,we propose a pyramid-like metamaterial absorber(MMA)based on ionic liquid(IL)1-ethyl-3-methylimidazolium dicyanamide(P-L ILMMA).The absorption exceeds 90%when the P-L ILMMA is utilized within the frequenc...In this work,we propose a pyramid-like metamaterial absorber(MMA)based on ionic liquid(IL)1-ethyl-3-methylimidazolium dicyanamide(P-L ILMMA).The absorption exceeds 90%when the P-L ILMMA is utilized within the frequency ranges of 3.74-50.00 GHz,exhibiting a relative absorption bandwidth of 172%.When the incident angle is 70°,the absorption exceeds 90%in the ranges of 7.05-50.00 GHz(TE)and 6.45-50.00 GHz(TM).Due to the excellent thermal stability of IL,P-L ILMMA still maintains excellent absorption performance within the temperature range of 25℃-100℃.Furthermore,P-L ILMMA demonstrates a lack of sensitivity to polarization,exhibiting consistent absorption performance across the entire polarization angle range of 0-90°.The high absorption efficiency is attributed to the synergistic impedance matching and electromagnetic energy dissipation that are enhanced by the P-L structure design.Experimentally validated absorption efficiency exceeding 90%is achieved across 3.87-40.00 GHz(TE)and 7.65-40.00 GHz(TM).Under 70°oblique incidence,over 90%absorptivity is maintained in both polarization modes,with absorption bandwidth spanning 12.74-40.00 GHz(TE)and14.74-40.00 GHz(TM).The combination of these advantages positions P-L ILMMA as a promising candidate for next-generation broadband absorbers in electromagnetic shielding,stealth technology,and microwave engineering applications.展开更多
基金the Research Council of University of Guilan for the financial support
文摘An effcient method for the synthesis of imidazole derivatives by a three-component condensation of benzil or 9,10-phenanthrenequinone,aldehydes and ammonium acetate using supported ionic liquidlike phase（SILLP）catalyst under ultrasonic irradiation or classical heating conditions is reported.The present methodology offers several advantages,such as excellent yields,simple procedures,short reaction times,simple work-up and mild conditions.The catalyst is easily separated from the products by fltration and also exhibits remarkable reusable activity.These highly substituted imidazoles were also evaluated for their anti-microbial activity.
基金supported by the Fund for Natural Science Foundation of Gansu Province for Young Scientists(No.23JRRA1112)the Scientific Research Foundation of Lanzhou University for the Talented Young Scholars(No.561120207)。
文摘In this work,we propose a pyramid-like metamaterial absorber(MMA)based on ionic liquid(IL)1-ethyl-3-methylimidazolium dicyanamide(P-L ILMMA).The absorption exceeds 90%when the P-L ILMMA is utilized within the frequency ranges of 3.74-50.00 GHz,exhibiting a relative absorption bandwidth of 172%.When the incident angle is 70°,the absorption exceeds 90%in the ranges of 7.05-50.00 GHz(TE)and 6.45-50.00 GHz(TM).Due to the excellent thermal stability of IL,P-L ILMMA still maintains excellent absorption performance within the temperature range of 25℃-100℃.Furthermore,P-L ILMMA demonstrates a lack of sensitivity to polarization,exhibiting consistent absorption performance across the entire polarization angle range of 0-90°.The high absorption efficiency is attributed to the synergistic impedance matching and electromagnetic energy dissipation that are enhanced by the P-L structure design.Experimentally validated absorption efficiency exceeding 90%is achieved across 3.87-40.00 GHz(TE)and 7.65-40.00 GHz(TM).Under 70°oblique incidence,over 90%absorptivity is maintained in both polarization modes,with absorption bandwidth spanning 12.74-40.00 GHz(TE)and14.74-40.00 GHz(TM).The combination of these advantages positions P-L ILMMA as a promising candidate for next-generation broadband absorbers in electromagnetic shielding,stealth technology,and microwave engineering applications.
