NanoBrook 90Plus Particle Size Analyzer

NanoBrook 90Plus is part of a family of particle size and zeta potential instruments. The 90Plus utilizes Dynamic Light Scattering (DLS) for fast, routine, submicron measurements in research and quality control applications. It is an ideal choice for users who only require DLS particle size measurements but still need rigorous tools for creation of customized reports and multimodal and unimodal size distributions. The in 90Plus can be upgraded at a later time to include zeta potential measurement capability.

The technologies built-in our light scattering instrumentation were developed by world-renowned researchers in particle characterization that did their post-doc at Stony Brook University. The designed the 90Plus with a superior optical plate that utilizes state-of-the-art optics, powerful 40 mW solid state laser, and highly sensitive Avalanche Photodiode Detector (APD).  At the heart of the 90Plus particle sizer is the digital correlator for the auto correlation function that is used to calculate effective diameter and Polydispersity Index (PDI). The Brookhaven Instruments correlators were developed by Dr. Walther Tscharnuter, who was the original innovator of the digital correlator used in todays instrumentation.

The 90Plus analyzer is perfect for rapid, routine sizing applications in quality control and research. It is a fast and precise method for characterizing protein and nanoparticle size distributions.

Particle Sizing Features

•Wide range of particle size from 1 nm to 6 µm
•40 mW temperature controlled, solid-state laser diode with APD detector collecting signal from a 90° scatter
•Peltier temperature control from −5 °C to 110 °C with nitrogen gas connection to prevent condensation
•TurboCorr digital correlator that is 100% efficient, real-time operation over the full delay time range
•Data from correlator and count rate history can be viewed in their raw, unprocessed, unsmoothed form
•Dust filter to reject data that is corrupted by scattering from dust
•Automatic baseline index determination along with option for calculation at infinite delay time
•Conforms to ISO 2241 and ISO 13321 standards
NanoBrook 90Plus particle autocorrelation function displays data in graphical form the decay rate and baseline. The  average effective diameter (Eff. Dia.) and Polydispersity (PDI), a measure of the distribution width, are displayed.
Multimodal size distributions can be determined. A numerical algorithm, including Mie theory, can be used.

During a measurement, the display can be switched interactively between any one of these — correlation function, lognormal, or multimodal — each shown “live” as data are accumulated.



Sample Type

Most nanoparticle and colloidal-sized materials, in any non-absorbing liquid.

Size Range

 1 nm to 6 μm diameter, depending on refractive index and concentration

Sample Cells

1 to 3 mL disposable plastic, 50 μL disposable, 40 μL quartz flow cell, 10 μL quartz minimum

Concentration Range

2 ppm to 50 mg/mL, depending on refractive index and concentration

Signal Processing

Dynamic Light Scattering, DLS


Brookhaven’s TurboCorr, multitau, research grade with 510 channels, covering the equivalent of 1010 linearly-spaced channels, 100% efficiency, real-time operation over the entire delay-time range.


Sizing: ± 1% typical

Temperature Control

-5 ° C to 110 ° C, ± 0.1 ° C, active control. No external circulator required.

Condensation Control

Purge facility using dry air, nitrogen preferred

Standard Laser

40 mW solid-state diode laser, nominal 640 nm wavelength, temperature controlled

Scattering Angle


Algorithms and Models

NNLS, Contin, Cumulants, Lognormal

Data Presentation

Average & width, lognormal fit, and multimodal size distribution for sizing


ISO13321 and ISO22412 compliant results for sizing

Power Requirements

100/115/220/240 VAC, 50/60 Hz, 150 Watts


23.3 x 42.7 x 48.1 cm (HWD)


15 kg

Environmental Characteristics

Temperature 10 ° C to 75 ° C

Humidity 0% to 95%, non-condensing


ISO13321 and ISO2241

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