In the clean room of the research laboratory, a microscope shaped instrument is using a laser as a "probe" to penetrate protein solutions, nanoparticle suspensions, and even polymer materials, drawing particle size distribution curves and molecular weight data on the screen. This is the dynamic static laser light scattering instrument - an analytical tool that combines dynamic light scattering (DLS) and static light scattering (SLS) technologies, unlocking the microscopic mysteries of nanomaterials, biomolecules, and other fields.
The core of the dynamic and static laser light scattering instrument lies in the physical mechanism of the interaction between laser and matter. When monochromatic laser is irradiated onto the sample, suspended particles or molecules will undergo Brownian motion due to thermal motion, resulting in random fluctuations in scattered light intensity. The dynamic light scattering module analyzes this wave frequency through autocorrelation function, accurately calculates the hydrodynamic radius and diffusion coefficient of particles, and covers a particle size detection range of 0.3 nanometers to 10 micrometers with a resolution of 0.1 nanometers.
The static light scattering module focuses on the angle dependence of the scattered light intensity. By using a multi angle detector array, the device captures light intensity data at different scattering angles. Combined with Zimm plotting or Berry fitting, the weight average molecular weight, radius of rotation, and two-dimensional coefficient of the sample can be obtained simultaneously.
In the field of biomedicine, the dynamic and static laser light scattering instrument is the "gold standard" for protein quality control. By monitoring the particle size changes of antibody drugs during storage, protein aggregation tendency can be alerted to ensure the stability of biological products. In gene therapy research, equipment is used to characterize the particle size distribution of adeno-associated virus (AAV) vectors and assist in optimizing the viral vector process.
In the field of nanotechnology, devices have become "material microscopes". From the analysis of pore structure in metal organic framework materials (MOFs), to the evaluation of size uniformity of graphene quantum dots, and to the stability monitoring of colloidal gold nanoparticles, their multi parameter analysis capabilities provide intuitive guidance for the design of nanomaterials.
Currently, dynamic and static laser light scattering instruments are evolving towards intelligence and multimodality. The introduction of AI algorithms significantly improves data parsing efficiency, and through deep learning optimization of autocorrelation function fitting, the particle size analysis time is shortened by 80%. More noteworthy is the breakthrough in combination technology, which combines equipment with field flow separation (FFF) or size exclusion chromatography (SEC) to achieve online separation and characterization of complex samples. Through the SEC-DLS combination system, the dissociation behavior of protein aggregates in chromatographic columns has been successfully resolved.
In the field of live detection, fiber optic probe based dynamic light scattering instruments have emerged. This device uses flexible optical fibers to introduce laser into biological tissues, achieving real-time monitoring of physiological parameters such as extracellular matrix hardness and blood microcirculation, providing a new tool for early diagnosis of tumors.