If you're having trouble viewing this email, you may see it online.


Visit our website at www.customspinnerets.com
The Spinneret
Autumn 2023

A Quarterly Newsletter from ramé-hart devoted to Coaxial, Triaxial, Quadaxial and Custom
Spinnerets used for Electrospinning, Bioprinting and Related Applications



Electrospinning vs Electrospraying

Coaxial electrospinning and coaxial electrospraying are both useful electrohydrodynamic techniques used to produce core-sheath nanomaterials. They differ primarily in their output morphology and applications. Both methods can be accomplished using a ramé-hart Prebuilt or Custom Coaxial Needle product.

Coaxial electrospraying is a technique that involves the generation of fine droplets or particles from a coaxial nozzle system by applying an electric field. This setup consists of an inner needle, which contains the core solution, and an outer needle, which carries the shell solution. The core solution is typically conductive, while the shell solution is non-conductive or has a significantly lower conductivity. When a voltage is applied between the inner and outer needles, an electric field is generated. The electric field forces the conductive core solution to break into fine droplets, which are then surrounded by the shell solution. Coaxial electrospraying allows for precise control over the size and morphology of the particles or droplets produced. By adjusting parameters such as voltage, flow rates, and solution properties, researchers can fine-tune the size of the resulting droplets. Coaxial electrospraying is commonly employed in the pharmaceutical industry for the encapsulation of active ingredients in drug delivery systems. It is also used in the food industry for flavor encapsulation, as well as in materials science for creating functional coatings and composite materials.

ramé-hart Custom Coaxial Needle (built to customer specifications)

Coaxial electrospinning, on the other hand, is a method used to produce nanofibers by applying an electric field to a coaxial needle. This technique is primarily employed in fields like tissue engineering, filtration, and the production of functional textiles. Similar to coaxial electrospraying, coaxial electrospinning employs a coaxial needle consisting of an inner and an outer needle. The core solution in this case is usually a polymer solution, while the shell solution may contain a different polymer or solvent. By applying a voltage between the inner and outer needles, an electric field is created. The electric field results in the elongation and thinning of the polymer solution, leading to the formation of nanofibers. Coaxial electrospinning provides precise control over the diameter of the nanofibers produced. Factors like applied voltage, flow rates, and solution viscosity can be adjusted to tailor the fiber diameter to specific requirements. Coaxial electrospinning is extensively used in tissue engineering for producing nanofibrous scaffolds that mimic the extracellular matrix. It finds application in filtration systems, where the nanofibers act as a highly efficient filtration medium. Coaxial electrospinning is also valuable in the textile industry for creating functional fabrics with enhanced properties.

ramé-hart Prebuilt Coaxial Needle (nine sizes are kept in stock at all times)

The key difference between coaxial electrospinning and coaxial electrospraying is the former produces coaxial nanofibers while the latter produces small nanoscopic particles. Coaxially spun nanofibers are used in tissue engineering, non-woven textile production, and filtration applications while coaxially electrosprayed nanoparticles are used in drug delivery with encapsulation and controlled release capabilities. In the case of coaxial electrospraying, the core material is more conductive than the shell material. However, with coaxial electrospinning, both the core and shell are typically polymer solutions of varying viscosities. In both cases, coaxial electrospraying and coaxial electrospinning can be precisely controlled by adjusting voltage, flow rates, viscosities, and other control parameters.

In conclusion, coaxial electrospraying and coaxial electrospinning are two electrohydrodynamic techniques that offer precise control over the size and morphology of their respective outputs. They have distinct applications but both use coaxial needles. Researchers and engineers choose between these methods based on the specific needs of their projects, seeking to harness the unique advantages of each technique for the development of innovative products and technologies. Whether your application lends itself to coaxial electrospinning or coaxial electrospraying, ramé-hart stands ready to build a custom coaxial needle to your exacting specifications.


Save on your next ramé-hart spinneret order

Thank you for reading our Spinneret Newsletter. We'd like you to try some of our awesome spinneret products. Please feel free to use either of the following coupons on your next spinneret order.



Carl Clegg
Director of Sales
Phone 973-448-0305
Contact us