The viscoelastic response of commercial Al–Zn–Mg and Al–Cu–Mg alloys was measured with a dynamic-mechanical analyzer (DMA) as a function of the temperature (from 30 to 425C) and the loading frequency (from 0.01 to 150Hz).The time-temperature superposition (TTS) principle has proven to be useful in studying mechanical relaxations and obtaining master curves for amorphous materials. In this work,...

First posted March 7, 2023 For additional information, contact: Geology, Energy & Minerals Science CenterU.S. Geological SurveyMail Stop 95412201 Sunrise Valley DriveReston, VA 20192Email: [email protected] As the United States transitions away from fossil fuels, its economy will rely on more renewable energy. Because current energy sources sometimes produce variable power supplies, it ...

There is strong recent interest in ultrathin, flexible, safe energy storage devices to meet the various design and power needs of modern gadgets. To build such fully flexible and robust electrochemical devices, multiple components with specific electrochemical and interfacial properties need to be integrated into single units. Here we show that these basic components, the electrode, separator, ...

Introduction Rechargeable batteries with improved energy and power density have many potential, high impact applications including advanced portable electronics and electric vehicles. However, most ‘next-generation’ materials capable of providing improved performance suffer from rapid capacity degradation and severe loss of capacity when rapidly discharged. Architectural design that could succe...

An important open problem in the synthesis of passive controllers is to obtain a passive network which realizes an arbitrary given impedance function and contains the least possible number of elements. This problem has its origins in electric circuit theory, and is directly applicable to the costeffective design of mechanical systems containing the inerter. Despite a rich history, the problem c...

Energy storage is at present one of the foremost issues society faces. However, material challenges now serve as bottlenecks in technological progress. Lithium-ion batteries are the current gold standard to meet energy storage needs; however, they are limited owing to the inherent instability of liquid electrolytes. Block copolymers can self-assemble into nanostructures that simultaneously faci...