Cientistas resolvem mistério centenário da borracha reforçada

13 de maio de 2026

Reportado por IA

Pesquisadores da Universidade do Sul da Flórida identificaram o mecanismo que faz com que as partículas de negro de fumo fortaleçam a borracha, resolvendo um enigma científico que perdurava por quase um século. Suas simulações computacionais revelam como o material resiste ao estiramento lutando efetivamente contra si mesmo.

A equipe, liderada pelo professor de engenharia David Simmons, conduziu 1.500 simulações de dinâmica molecular que totalizaram o equivalente a 15 anos de tempo de computação. Trabalhando com o pesquisador de pós-doutorado Pierre Kawak e o aluno de doutorado Harshad Bhapkar, eles mostraram que as partículas de negro de fumo limitam o quanto a borracha afina quando esticada. Isso força o material a expandir em volume, aumentando significativamente sua rigidez e resistência.

Researchers discover contactless magnetic friction

22 de março de 2026 Reportado por IA Imagem gerada por IA

Scientists at the University of Konstanz have identified a new type of sliding friction that occurs without physical contact, driven by magnetic interactions. This phenomenon breaks Amontons' law, a 300-year-old physics principle, by showing friction peaks at certain distances rather than increasing steadily with load. The findings appear in Nature Materials.

Scientists find simple liquids fracture like solids under stress

Researchers at Drexel University have discovered that certain viscous liquids can snap apart like solids when stretched with sufficient force. The finding, detailed in a study published in Physical Review Letters, challenges traditional views of fluid dynamics by linking the behavior to viscosity rather than elasticity. This phenomenon was observed in simple liquids such as tar-like hydrocarbons and styrene oligomer.

Scientists stabilize carbene in water, confirming vitamin B1 theory

11 de abril de 2026 Reportado por IA

Chemists at the University of California, Riverside have stabilized a highly reactive carbene molecule in water, proving a 67-year-old hypothesis about vitamin B1's role in the body. The breakthrough, detailed in Science Advances, resolves a long-standing biochemical puzzle. It also suggests potential for greener chemical manufacturing.

Ciência

Scientists create milk-based biodegradable film for packaging

Ciência

Scientists synthesize silicon-based aromatic molecule after 50 years

Tecnologia

Scientists uncover cause of screeching Scotch tape

Physicists solve mystery of charge separation in volcanic lightning

Physicists have identified the role of carbon-containing molecules in determining charge polarity during particle collisions in volcanic ash clouds. This discovery explains the triboelectric effect that leads to volcanic lightning. The finding comes from experiments with silicon dioxide particles.

NYU scientists use light to control crystal formation

02 de março de 2026 Reportado por IA

Researchers at New York University have developed a method to direct the assembly of microscopic particles into crystals using light. This technique, detailed in the journal Chem, allows for real-time control over crystal growth and dissolution. The approach could enable new responsive materials for applications in optics and photonics.

quarta-feira, 13 de maio de 2026, 02:51h