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Credit: American Chemical Society Counterfeiters who sell knockoffs of popular shoes, handbags and other items are becoming increasingly sophisticated, forcing manufacturers to find new technologies to stay one step ahead. Now, researchers reporting in ACS Nano have developed tiny Janus balls that show their colored side under a magnetic field. These microparticles could be useful in inks for anti-counterfeiting tags, which could be verified with an ordinary magnet, the researchers say. Watch a video of the Janus balls here. In ancient Roman mythology, Janus was the two-faced god of transitions. Similarly, so-called Janus balls are microspheres that have two sides with distinct properties. Shin-Hyun Kim and colleagues wanted to make Janus balls out of two unmixable resins: one that contained magnetic nanoparticles, and another that contained silica particles. The magnetic side of the ball would also contain carbon black, causing that hemisphere to appear dark, whereas the silic

United statesSouth koreaShin hyun kimUs congressNational research foundation of koreaAmerican chemical societyHyun kimNational research foundationஒன்றுபட்டது மாநிலங்களில்தெற்கு கொரியாதாடை யுங் கிம்எங்களுக்கு காங்கிரஸ்தேசிய ஆராய்ச்சி அடித்தளம் ஆஃப் கொரியாஅமெரிக்கன் இரசாயன சமூகம்யுங் கிம்தேசிய ஆராய்ச்சி அடித்தளம்