Ultrawideband fractal metamaterial absorber made of nickel operating in the UV to IR spectrum

Muhammad Ashar Naveed; Rana Muhammad Hasan Bilal; Muhammad Abuzar Baqir; Muhammad Mehran Bashir; Muhammad Mahmood Ali; Arbab Abdur Rahim

doi:10.1364/oe.446423

Single-peak-regulation and wide-angle dual-band metamaterial absorber based on hollow-cross and solid-cross resonators

The European Physical Journal Applied Physics ◽

10.1051/epjap/2020200145 ◽

2020 ◽

Vol 91 (3) ◽

pp. 30901

Author(s):

Yibo Tang ◽

Longhui He ◽

Jianming Xu ◽

Hailang He ◽

Yuhan Li ◽

...

Keyword(s):

Transverse Electric ◽

Surface Current ◽

Dielectric Substrate ◽

Transverse Magnetic ◽

Metamaterial Absorber ◽

Absorption Peak ◽

Dual Band ◽

Single Peak ◽

Wide Angle ◽

Surface Current Density

A dual-band microwave metamaterial absorber with single-peak regulation and wide-angle absorption has been proposed and illustrated. The designed metamaterial absorber is consisted of hollow-cross resonators, solid-cross resonators, dielectric substrate and metallic background plane. Strong absorption peak coefficients of 99.92% and 99.55% are achieved at 8.42 and 11.31 GHz, respectively, which is basically consistent with the experimental results. Surface current density and changing material properties are employed to illustrate the absorptive mechanism. More importantly, the proposed dual-band metamaterial absorber has the adjustable property of single absorption peak and could operate well at wide incidence angles for both transverse electric (TE) and transverse magnetic (TM) waves. Research results could provide and enrich instructive guidances for realizing a single-peak-regulation and wide-angle dual-band metamaterial absorber.

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THE JET-COOLED HIGH-RESOLUTION IR SPECTRUM OF FORMIC ACID CYCLIC DIMER

Proceedings of the 72nd International Symposium on Molecular Spectroscopy ◽

10.15278/isms.2017.wd03 ◽

2017 ◽

Author(s):

Manuel Goubet ◽

Robert Georges ◽

P. Roy ◽

Atef Jabri ◽

Pascale Soulard ◽

...

Keyword(s):

High Resolution ◽

Formic Acid ◽

Ir Spectrum ◽

Cyclic Dimer

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Sulfonyl isocyanides RSO2NC

10.26434/chemrxiv.5722528.v1 ◽

2017 ◽

Author(s):

Curt Wentrup ◽

Horst Briehl

Keyword(s):

Ir Spectrum ◽

Reaction Conditions ◽

Flash Vacuum Pyrolysis ◽

Vacuum Pyrolysis

Flash vacuum pyrolysis (FVP) of 5-azido-1-aryltetrazoles results in triple N2 elimination and formation of aryl isocyanides RNC, which rearrange in part to aroylnitriles RCN under the reaction conditions. Similar FVP of 5-azido-1-arenesulfonyltetrazoles generates a compound absorbing in the IR spectrum (77 K) at 2090 cm-1 and assigned the structure of arenesulfonyl isocyanide, ArSO2NC 11. FVP at temperatures above 600 oC results in progressively more nitrile ArSO2CN 12. Compound 11 also disappears on warming above -80 oC

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Sulfonyl isocyanides RSO2NC

10.26434/chemrxiv.5722528 ◽

2017 ◽

Author(s):

Curt Wentrup ◽

Horst Briehl

Keyword(s):

Ir Spectrum ◽

Reaction Conditions ◽

Flash Vacuum Pyrolysis ◽

Vacuum Pyrolysis

Flash vacuum pyrolysis (FVP) of 5-azido-1-aryltetrazoles results in triple N2 elimination and formation of aryl isocyanides RNC, which rearrange in part to aroylnitriles RCN under the reaction conditions. Similar FVP of 5-azido-1-arenesulfonyltetrazoles generates a compound absorbing in the IR spectrum (77 K) at 2090 cm-1 and assigned the structure of arenesulfonyl isocyanide, ArSO2NC 11. FVP at temperatures above 600 oC results in progressively more nitrile ArSO2CN 12. Compound 11 also disappears on warming above -80 oC

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Synthesis of the semi-rigid analogues of prothiadene and dithiadene as potential antidepressant and antihistamine agents: 11-[2-(Dimethylaminomethyl)cyclohexylidene]-6,11-dihydrodibenzo[b,e]thiepins and 4-[2-(dimethylaminomethyl)cyclohexylidene]-4,9-dihydrothieno-[2,3-c]-2-benzothiepins

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19851078 ◽

1985 ◽

Vol 50 (5) ◽

pp. 1078-1088 ◽

Cited By ~ 4

Author(s):

Zdeněk Polívka ◽

Jiří Holubek ◽

Emil Svátek ◽

Jan Metyš ◽

Miroslav Protiva

Keyword(s):

Hydrochloric Acid ◽

Ir Spectrum ◽

Title Compound ◽

Dilute Hydrochloric Acid ◽

Amino Alcohols ◽

Geometric Isomers ◽

Pharmacological Testing

Reaction of dibenzo[b,e]thiepin-11(6H)-one with 2-(dimethylaminomethyl)cyclohexylmagnesium chloride gave a mixture of stereoisomeric amino alcohols IX from which four homogeneous bases (IXa to IXd) were separated by chromatography. Dehydration of these compounds with boiling dilute hydrochloric acid afforded mixtures of racemic geometric isomers of the title compound VII, which were separated by crystallization. To the prevailing less polar base VIIa (E)-configuration was assigned on the basis of the IR spectrum. Using a similar procedure, thieno[2,3-c]-2-benzothiepin-4(9H)-one gave mixture of amino alcohols X from which three homogeneous stereoisomers X-A to X-C were isolated. Their dehydration resulted in both expected racemic geometric isomers VIII-A and VIII-B. Pharmacological testing proved the character of an antidepressant for the semi-rigid analogue of dithiadene VIII.

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