Optical trapping and manipulation of single particles in air: Principles, technical details, and applications

Gong, Zizheng; Pan, Yong‐Le; Videen, Gorden; Wang, Chuji

doi:10.1016/j.jqsrt.2018.04.027

Cited by 122 publications

(106 citation statements)

References 302 publications

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“…We use counter propagating tweezers (CPT) which enables the trapping of micron and submicron particles with tight particle confinement, allows for long working distance and has a relatively straightforward alignment procedure. [39][40][41][42] Many other optical traps are available, 43 however CPT trap is the most suited for our purposes due to aforementioned advantages. One of the aims of the work presented in this paper is to study the photoacoustic response of optically-trapped particles at different relative humidities.…”

Section: Introductionmentioning

confidence: 99%

Assessing relative humidity dependent photoacoustics to retrieve mass accommodation coefficients of single optically trapped aerosol particles

Diveky

Roy

Cremer

et al. 2019

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 99%

Assessing relative humidity dependent photoacoustics to retrieve mass accommodation coefficients of single optically trapped aerosol particles

Diveky

Roy

Cremer

et al. 2019

Phys. Chem. Chem. Phys.

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“…Twice awarded the Nobel Prize in 1997 and 2018, optical trapping has been widely used to trap, manipulate, and characterize single atoms, biological cells, protein molecules, virus, nanoparticles, as well as airborne particles. [20][21][22] Arthur Ashkin first levitated a transparent glass microsphere in air using the radiation pressure force. 23 But, for absorbing particles, the photophoretic force plays a dominant role in an optical trap, which leads to more complex particle behaviors, especially for heterogeneous or irregularly shaped particles.…”

Section: Introductionmentioning

confidence: 99%

Online Characterization of Single Airborne Carbon Nanotube Particles Using Optical Trapping Raman Spectroscopy

et al. 2019

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Carbon nanotubes (CNTs) have become recognized as a potential environmental and health hazard as their applications are broadening and manufacturing costs are reducing. Fundamental information of CNTs in air is of significant importance to our understanding of their environmental fate as well as to further applications. Extensive efforts have been made over decades on characterizing CNTs; however, a majority of the studies are of bulk or CNTs dispersed on substrates. In the present study, we characterize single CNT particles in air using optical trapping Raman spectroscopy (OT-RS). Different types of CNT particles, as well as glassy carbon spheres, were optically trapped in air. Their physical properties were viewed by microscopic bright field images and scattering images; their chemical properties and structural information can be inferred from characteristic Raman bands. The system can also spatially resolve the morphology and chemical distribution of optically trapped CNT particles in air. The OT-RS technique combines single-particle morphological and chemical information and offers an online method to characterize the physicochemical properties of single CNT particles at their native states in air.

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“…Studying single particles as opposed to ensembles avoids ensemble averaging effects [44][45][46] and allows for size-specific measurements performed in tightly controlled environmental conditions (temperature and relative humidity). Optical traps [47][48][49][50][51][52] are routinely used to levitate a single droplet in air, as they allow for convenient working distance, tight confinement and do not introduce any morphological changes to the trapped droplets. Optical trapping has been used in the past, for example, to measure refractive indices of aerosols, [53][54][55][56][57][58][59] collect Raman spectra [60][61][62] or measure viscosity 63 and surface tension.…”

Section: Introductionmentioning

confidence: 99%

Photoacoustics of single aerosol droplets immobilised by counter-propagating optical tweezers

Diveky

Gleichweit²,

Roy

et al. 2020

Optical Trapping and Optical Micromanipulation XVII

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In this contribution we discuss the influence of relative humidity on photoacoustic measurements from both an experimental and theoretical perspective. We present a refined model of the photoacoustic (PA) signal that accounts for elevated particle temperatures and different levels of relative humidity. We use this new model together with the photoacoustic data collected with our photothermal single-particle spectrometer (PSPS) to retrieve the mass accommodation coefficients of water on organic aerosol particles. The single-particle nature of our experiments is achieved by employing counter-propagating tweezers. Furthermore, we investigate the influence of relative humidity on the eigenfrequency of the PA cell.

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Optical trapping and manipulation of single particles in air: Principles, technical details, and applications

Cited by 122 publications

References 302 publications

Assessing relative humidity dependent photoacoustics to retrieve mass accommodation coefficients of single optically trapped aerosol particles

Assessing relative humidity dependent photoacoustics to retrieve mass accommodation coefficients of single optically trapped aerosol particles

Online Characterization of Single Airborne Carbon Nanotube Particles Using Optical Trapping Raman Spectroscopy

Photoacoustics of single aerosol droplets immobilised by counter-propagating optical tweezers

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