Raman tweezers for tire and road wear micro- and nanoparticles analysis

Abstract

Raman tweezers allow us to trap and analyze nanoparticles generated during tire abrasion and brake pad friction.

Current Methods and Prospects for Analysis and Characterization of Nanomaterials in the Environment

“…Thus, there is a huge need for developing methods to analyze and characterize these emerging nanoscale contaminants in the environment. The analysis of nanoplastics in environmental matrices is a research hotspot, but only a limited number of studies have dealt with real environmental samples. , So far, most reported methods for separating, detecting, and characterizing nanoplastics are adopted from the analyses of microplastics and inorganic nanomaterials, and these methods typically have size detection limits above 100 nm, although the latest Raman tweezers technique with spatial resolution down to 50 nm has the potential to lower this size detection limit. , As with the analysis of inorganic nanomaterials, only a limited number of methods can simultaneously quantify the abundance and characterize the composition or morphology of nanoplastics in environmental matrices. , Moreover, their smaller size than microplastics and higher heterogeneity than engineered nanoparticles makes nanoplastics more challenging to analyze and characterize in environmental samples . Hence, future research efforts on developing analysis and characterization methods specific to the structural and surface properties of nanoplastics are warranted.…”

“…275,280 So far, most reported methods for separating, detecting, and characterizing nanoplastics are adopted from the analyses of microplastics and inorganic nanomaterials, and these methods typically have size detection limits above 100 nm, 275 although the latest Raman tweezers technique with spatial resolution down to 50 nm has the potential to lower this size detection limit. 281,282 As with the analysis of inorganic nanomaterials, only a limited number of methods can simultaneously quantify the abundance and characterize the composition or morphology of nanoplastics in environmental matrices. 280,283 Moreover, their smaller size than microplastics and higher heterogeneity than engineered nanoparticles makes nanoplastics more challenging to analyze and characterize in environmental samples.…”

Coordination/cation exchangeable dual sites intercalated multilayered T3C2Tx MXene for selective and ultrafast removal of thallium(i) from water

“…1c), which represent the vibration modes of nonstoichiometric titanium carbides in the MXene. [46][47][48] The peaks for both the G and D bands gradually become much weaker after sonication exfoliating and KOH treating, resulting in less graphitization and a cleaner structure, which could be beneficial for the capture of Tl + . Then, XPS was conducted to further study the chemical state of the samples.…”

Faster and More Accurate Geometrical-Optics Optical Force Calculation Using Neural Networks

“…Since the pioneering work by Ashkin in the 1970s, , they have become a common tool for biology, physics, and nanotechnology. − Due to its complexity, the calculation of the forces generated by optical tweezers has often relied on approximations that depend on the size of the particle . For particles larger than the light wavelength, such as cells, , microbubbles, microplastics, or metal-coated Janus microparticles, these forces can be described using the geometrical optics (GO) approximation. In this approximation, the light field is described as a collection of rays and the momentum exchange between the rays and the particle is calculated via the laws of reflection and refraction …”