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1. Janus on the brane

   https://doi.org/10.1007/JHEP07(2020)243  

   Gutperle, Michael; Uhlemann, Christoph F. (July 2020, Journal of High Energy Physics)

   null (Ed.)

   Abstract We present a non-supersymmetric deformation of probe branes describing conformal defects of codimension two in AdS/CFT. The worldvolume of the probe branes is deformed from AdS p × S 1 embedded in an AdS p +2 × ℳ D  −  p  − 2 background to an embedding of Janus form, which uses an AdS p− 1 slicing of AdS p and in which the brane bends along the slicing coordinate. In field theory terms this realizes conformal interfaces on codimension- two defects. We discuss these “Janus on the brane” solutions for AdS 3 × S 1 D3-branes in the AdS 5 × S 5 solution of Type IIB, realizing interfaces on surface defects in $$ \mathcal{N} $$ N = 4 SYM, and show that similar solutions exist for probe branes in AdS p +2 × S 9 −p vacua of M-theory and in the AdS 6 × S 4 solution of massive Type IIA. 

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2. Enzymatic Janus Liposome Micromotors

   https://doi.org/10.1021/acs.langmuir.3c00335  

   Jin, Hui; Cui, Jinyan; Zhan, Wei (March 2023, Langmuir)
3. A Janus carbaporphyrin pseudo-dimer

   https://doi.org/10.1038/s41467-024-47239-y  

   He, Haodan; Lee, Jiyeon; Zong, Zhaohui; Kim, Jiwon; Lynch, Vincent M; Oh, Juwon; Kim, Dongho; Sessler, Jonathan L; Ke, Xian-Sheng (April 2024, Nature Communications)

   LeBot, Nathalie; Larochelle, Stephane; Bergin, Enda; Saini, Prabhjot (Ed.)

   Abstract Carbaporphyrin dimers, investigated for their distinctive electronic structures and exceptional properties, have predominantly consisted of systems containing identical subunits. This study addresses the associated knowledge gap by focusing on asymmetric carbaporphyrin dimers with Janus-like characteristics. The synthesis of a Janus-type carbaporphyrin pseudo-dimer5is presented. It displays antiaromatic characteristics on the fused side and nonaromatic behavior on the unfused side. A newly synthesized tetraphenylene (TPE) linked bis-dibenzihomoporphyrin8and a previously reported dibenzo[g,p]chrysene (DBC) linked bis-dicarbacorrole9were prepared as controls. Comprehensive analyses, including¹H NMR spectral studies, single crystal X-ray diffraction analyses, and DFT calculations, validate the mixed character of5. A further feature of the Janus pseudo-dimer5is that it may be transformed into a heterometallic complex, with one side coordinating a Cu(III) center and the other stabilizing a BODIPY complex. This disparate regiochemical reactivity underscores the potential of carbaporphyrin dimers as versatile frameworks, with electronic features and site-specific coordination chemistry controlled through asymmetry. These findings position carbaporphyrin dimers as promising candidates for advances in electronic structure studies, coordination chemistry, materials science, and beyond. 

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4. Janus Cross-links in Supramolecular Networks

   https://doi.org/10.1021/jacs.1c10606  

   Mondal, Swagata; Lessard, Jacob J.; Meena, Chhuttan L.; Sanjayan, Gangadhar J.; Sumerlin, Brent S. (January 2022, Journal of the American Chemical Society)
5. Capillary induced twisting of Janus cylinders

   https://doi.org/10.1039/c7sm01288h  

   Oratis, Alexandros T.; Farmer, Timothy P.; Bird, James C. (January 2017, Soft Matter)

   At the appropriate length scales, capillary forces exerted by a liquid in contact with a compliant solid can cause the solid's deformation. Capillary forces are also able to align particles with discrete wettabilities – or Janus particles – at liquid interfaces. Their amphiphilic properties enable Janus particles to orient themselves at liquid interfaces such that both of their surfaces are facing their preferred fluid. However, it is unclear how to spontaneously obtain varying degrees of rotational alignment. Here we extend ideas of elasto-capillarity to modulate rotational alignment by connecting amphiphilic Janus cylinders in an antisymmetric configuration. As the Janus cylinders rotate they cause a twisting deformation of rod. We develop both a mathematical model and a physical macroscale setup to relate the angle of twist to the elastic and interfacial properties, which can be used to tune the extent of alignment of Janus particles at air–water interfaces. We additionally extend our analysis to calculate the twist profile on a compliant element with a distributed capillary torque. 

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