Results 251 to 260 of about 15,014 (299)
The Chemical Record, EarlyView.Valve metal oxide nanostructures such as TiO2, Ta2O5, Nb2O5, ZrO2, and HfO2 are emerging as versatile biomedical platforms due to their tunable surface properties, exceptional stability, and inherent biocompatibility. This review highlights their synthesis, physicochemical properties, and biological interactions, addressing their roles in advanced ...
Nina Kummer +11 more
wiley +1 more source
Nanomaterials' Multigenerational Effects by Single and Joint Exposure in Non‐mammalian Models
Environmental Toxicology, EarlyView.ABSTRACT Nanotoxicology has mainly focused on single‐generation studies, leaving multigenerational toxicity underexplored. Having animal welfare recently gained importance, we aimed to provide the state‐of‐the‐art of knowledge about multigenerational effects in non‐mammalian models in the case of nanomaterials (NM) single and joint exposure to other ...
Andy Joel Taipe Huisa +9 more
wiley +1 more source
From Cold to Hot: Nanozyme‐Based Strategies for Reprogramming the Tumour Immunoenvironment
Cell Proliferation, EarlyView.Nanozymes, with multi‐enzyme catalytic activities, reprogram the immunosuppressive tumour microenvironment by inducing immunogenic cell death, relieving hypoxia, and depleting antioxidants, effectively converting immunologically “cold” tumours into “hot” ones to boost cancer immunotherapy efficacy.
Yue Wang +9 more
wiley +1 more source
Nanoscale space weathering features in mature lunar soil revealed by TEM and APT
Meteoritics &Planetary Science, EarlyView.Abstract Space weathering significantly alters the optical, chemical, and structural properties of lunar regolith at micro‐ and nanoscales; yet detailed nanoscale variability within individual soils remains underexplored. Here we apply transmission electron microscopy (TEM) and atom probe tomography to four mineral grains (olivine, ilmenite, and two ...
Jennika Greer +6 more
wiley +1 more source
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Terahertz Quantum Cascade Lasers
SPIE Proceedings, 2003Unipolar semiconductor injection lasers emitting at THz frequencies (from 4.3 THz down to 2.8 THz) are discussed. The devices are based on interminiband transitions in chirped GaAs/AlGaAs superlattices that are arranged in a quantum-cascade scheme. The core, featuring about 100 repetitions of this type of superlattice, is embedded into a novel kind of ...
R. Köhler +6 more
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Physics Today, 1999
Band-structure engineering has led to a fundamentally new laser with applications ranging from highly sensitive trace-gas analysis to communications.
Federico Capasso +3 more
openaire +2 more sources
Band-structure engineering has led to a fundamentally new laser with applications ranging from highly sensitive trace-gas analysis to communications.
Federico Capasso +3 more
openaire +2 more sources
Quantum Optoelectronics, 1995
The recently demonstrated quantum cascade laser is a fundamentally new semiconductor laser.1-3 It relies on only one type of carrier (unipolar laser) and on quantum jumps of electrons between discrete conduction band energy levels of quantum wells. As such the wavelength can be tailored over a very wide range from the mid-ir (a few microns) to the far ...
F. Capasso, J. Faist
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The recently demonstrated quantum cascade laser is a fundamentally new semiconductor laser.1-3 It relies on only one type of carrier (unipolar laser) and on quantum jumps of electrons between discrete conduction band energy levels of quantum wells. As such the wavelength can be tailored over a very wide range from the mid-ir (a few microns) to the far ...
F. Capasso, J. Faist
openaire +1 more source
Science, 1994
A semiconductor injection laser that differs in a fundamental way from diode lasers has been demonstrated. It is built out of quantum semiconductor structures that were grown by molecular beam epitaxy and designed by band structure engineering. Electrons streaming down a potential staircase sequentially emit photons at the steps.
J, Faist +5 more
openaire +2 more sources
A semiconductor injection laser that differs in a fundamental way from diode lasers has been demonstrated. It is built out of quantum semiconductor structures that were grown by molecular beam epitaxy and designed by band structure engineering. Electrons streaming down a potential staircase sequentially emit photons at the steps.
J, Faist +5 more
openaire +2 more sources
Conference on Lasers and Electro-Optics-Europe, 1998
By controlling the quantum well widths and the tunnelling barrier thickness of heterostructures it is possible to create artificial potentials where level separations, dipole matrix elements, lifetimes and scattering times are dependent on the potential design.
C. Sirtori +4 more
openaire +1 more source
By controlling the quantum well widths and the tunnelling barrier thickness of heterostructures it is possible to create artificial potentials where level separations, dipole matrix elements, lifetimes and scattering times are dependent on the potential design.
C. Sirtori +4 more
openaire +1 more source
Chemical & Engineering News Archive, 2010
In this chapter we shall discuss basic features of quantum-cascade coherent-light sources; to this aim we shall review a few simulated experiments focusing on the microscopic explanation of the gain regime, both in the mid-infrared and in the far-infrared spectral regions.
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In this chapter we shall discuss basic features of quantum-cascade coherent-light sources; to this aim we shall review a few simulated experiments focusing on the microscopic explanation of the gain regime, both in the mid-infrared and in the far-infrared spectral regions.
openaire +2 more sources