Commercial spectrophotometer for particle sizing

Ferri, F.; Bassini, A.; Paganini, E.

doi:10.1364/ao.36.000885

Cited by 25 publications

(22 citation statements)

References 8 publications

(16 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To deal with the distribution o f radius, extinction m easurem ents at a discrete set o f wavelengths are perform ed (multispectral extinction). Inversion o f the experim ental results to get the distribution of sizes is not a trivial task, but it can be solved by a nonlinear inversion algorithm [5]. As is comm on for all the optical m ethods, the range o f the radius determined for optical extinction is related to the range o f the wavelength used.…”

Section: Introductionmentioning

confidence: 99%

Sizing gold nanoparticles by optical extinction spectroscopy

et al. 2004

View full text Add to dashboard Cite

In s t it u t e of Ph y s ic s P u bl is h in g AbstractT h e m e a s u re m e n t o f o p tic a l e x tin c tio n is u se d to d e te rm in e th e siz e o f n e a rly sp h e ric a l g o ld n a n o p a rtic le s su s p e n d e d in so lu tio n , p ro d u c e d by a re v e rse m ic e lle s p ro c e s s. T h e c o n tra st b e tw e e n th e m a x im u m a n d th e m in im u m in th e e x tin c tio n sp e c tra a ro u n d 4 5 0 a n d 5 2 0 n m sh o w s a lin e a r d e p e n d e n c e w ith th e m e a n ra d iu s o f th e g o ld p a rtic le s le ss th a n 3 n m ; how ever, th e m e th o d c a n b e u se d to siz e p a rtic le s u p to 7 n m . E x p e rim e n ta l re s u lts for ex tin c tio n sp e c tra c a n b e fitte d b y M ie s th e o ry i f th e o p tic a l co n sta n ts fro m b u lk m a te ria l v alu es a re m o d ifie d b y in tro d u c in g th e lim ita tio n o f th e m e a n fre e p a th d u e to c o llisio n s o f c o n d u c tio n e le c tro n s w ith th e b o u n d a ry o f th e n a n o p a rtic le s.

show abstract

Section: Introductionmentioning

confidence: 99%

Sizing gold nanoparticles by optical extinction spectroscopy

et al. 2004

View full text Add to dashboard Cite

show abstract

“…The lens group (the two objects labeled B) was used to slightly enlarge the diameter of the laser beam in order to ensure that a greater population of PS particles passes through the detecting laser beam. One aperture (object C) was used to change the detecting section of the laser beam, and another aperture (object E) was used to protect the detector from unwanted scattered light, which could bring additional error (9). A microscope with a CCD camera and a monitor (the visual magnification power for the whole system was over 1000 times) were employed to monitor particle motion and the coagulation process.…”

Section: Figmentioning

confidence: 99%

An Experimental Study of the Influence of Weak Convection on Perikinetic Coagulation

Sun

Qiao

2000

Journal of Colloid and Interface Science

View full text Add to dashboard Cite

A remarkably increased coagulation rate for 2-µm PS spheres was previously reported for a perikinetic coagulation experiment performed under microgravity conditions (1998, R. Folkersma, A. J. G. van Diemen, and H. N. Stein, J. Colloid Interface Sci. 206, 482); from this experiment, it was assumed that the leading factor slowing the coagulation process under normal gravitation was free convection due to gravity (1998, R. Folkersma, and H. N. Stein, J. Colloid Interface Sci. 206, 494). To test the influence of free convection as a single-effect factor on the coagulation process, a ground-based experiment was constructed. The coagulation rate of 2-µm PS spheres dispersed in water was determined by measuring the turbidity of the dispersion solution while convection-driven flows in the solution were checked with a visual magnification system. We found that it was possible to cease free convection-driven particle flows on the ground, as long as the experiments were carefully operated. The strength of convection was controlled by changing the temperature gradient applied to the sample cell. By monitoring both the coagulation rate and convection-driven flows simultaneously, our experiments showed that weak free convection (maximum speed <150 µm/s) actually has negligible effects on the coagulation rate. Copyright 2000 Academic Press.

show abstract

“…Additionally, these techniques can be expensive and complicated; for example, LII and LEM require additional quantification conversion, and DLS requires elaborate dilution (Park et al 2010;Yoon et al 2011). Some particle measurement techniques using light extinction spectrum can be used to measure the numberweighted distribution of particles without additional quantification procedures (Jones et al 1994;Wang and Hallett 1996;Ferri et al 1997;Müller et al 1999). However, it demands both elaborate scattering light detection and data processes, because ill-posed problem could arise.…”

Section: Introductionmentioning

confidence: 99%

Development of a Real-Time,In-SituParticle Sizing Technique: Real-Time Light Transmission Spectroscopy (RTLTS)

Yoon¹,

Chun²

2013

Aerosol Science and Technology

View full text Add to dashboard Cite

We developed an improved particle measurement spectroscopic technique, real-time laser transmission spectroscopy (RTLTS), to detect the number-weighted distribution of particles in real time. The measurement system used a deuterium-tungsten lamp for the light source and a spectrometer as the detector. The operating wavelength range was 300-810 nm. To obtain a physically reasonable number concentration from the experimental results, a sequential regularization method was used during the calculations. To verify the feasibility and reliability of RTLTS, the number-weighted distribution of polystyrene particle suspensions was determined over diameters ranging from 0.005 to 2.000 μm in 0.005-μm increments. The measured concentration error was 0.67-32.67%. A mean diameter of the smallest particle we had detected was 0.09 μm, with a 16% oversizing. The measurable concentration range was ∼10 8 #/cc to ∼10 11 #/cc for 0.895-μm-diameter particles. The measurable concentration range could be adjusted simply by changing the system configuration. This technique is available for both waterborne and airborne particles.

show abstract

Commercial spectrophotometer for particle sizing

Cited by 25 publications

References 8 publications

Sizing gold nanoparticles by optical extinction spectroscopy

Sizing gold nanoparticles by optical extinction spectroscopy

An Experimental Study of the Influence of Weak Convection on Perikinetic Coagulation

Development of a Real-Time,In-SituParticle Sizing Technique: Real-Time Light Transmission Spectroscopy (RTLTS)

Contact Info

Product

Resources

About