Analysis of Microrheology for biomaterial design by Diffusing wave spectroscopy (DWS) (CAT#: STEM-MB-0865-WXH)

Introduction

Biomaterials are a versatile and diverse class of materials that have significantly advanced long-established and emerging fields such as drug delivery, tissue engineering, and immunoengineering. For these applications, precise control of their chemical and mechanical properties is critical to drive a specified biological response. Soft biomaterials are often used to mimic the viscoelastic properties of living systems.
Rheology is the study of how materials deform in response to force and is routinely examined in biomaterial systems. Microrheology has been used to characterize a wide range of complex fluids, suspensions, and soft polymeric materials. Using microrheology in the design of biomaterials has many practical advantages such as rapid acquisition speed, simple preparation requirements, and low sample volume.

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Principle Applications Procedure Materials Notes Related Products

Principle

Diffusing-wave spectroscopy (DWS) is an optical technique derived from dynamic light scattering (DLS) that studies the dynamics of scattered light in the limit of strong multiple scattering. DWS is able to give information about the local dynamics of particle dispersion in a highly turbid medium. It has been widely used in the past to study colloidal suspensions, emulsions, foams, gels, biological media, and other forms of soft matter. If carefully calibrated, DWS allows the quantitative measurement of microscopic motion in a soft material, from which the rheological properties of the complex medium can be extracted via the microrheology approach.
The technique of DWS depends on the scattering of light from highly turbid suspensions. A sample of the suspension is illuminated by light from a laser and the incoming photons are multiply scattered. This scattered light is detected and subjected to autocorrelation analysis.

Applications

• Diffusing Wave Spectroscopy (DWS) is an advanced light scattering technique, which is primarily applied for microrheology and particle sizing.
• DWS has been applied in biomedical and clinical areas, especially in monitoring cerebral blood flow (CBF).

Procedure

1. Sample Preparation
2. Diffusing Wave Spectroscopy Testing
3. Data analysis

Materials

• Diffusing wave spectroscopy (DWS) instrument
• DWS RheoLab

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