The polymer defines what your nanofibers can do; the solvent largely decides whether you can make them at all. A good solvent system dissolves the polymer completely, evaporates at the right rate during flight and gives the solution suitable conductivity and surface tension.

Four properties to check

Solubility

The polymer must dissolve fully, without gel particles, at the concentration needed for entanglement. Undissolved material blocks the needle and destabilises the jet.

Volatility

If the solvent evaporates too slowly, wet fibers land on the collector and fuse into films. If it evaporates too quickly, the solution dries at the needle tip and clogs it. Many researchers blend a volatile solvent with a less volatile one to land in between.

Conductivity and dielectric properties

Solvents with higher dielectric constants generally support more charge on the jet, which helps stretching and reduces beads.

Surface tension

Lower surface tension makes it easier to form a continuous jet at a given voltage.

Commonly reported systems

These combinations appear frequently in the literature and are reasonable starting points for exploratory work:

Polymer Frequently used solvent(s)
PVA Water
PEO Water, ethanol–water
PAN DMF
PVDF DMF / acetone blends
PCL Chloroform / DMF or DCM / DMF blends
Nylon-6 Formic acid

Always confirm the details — concentration, ratio, additives — against recent publications that match your polymer grade and application.

Safety first

Several common electrospinning solvents are toxic or flammable. Read the safety data sheet, work in a ventilated enclosure or fume hood, and keep solvent vapour away from high-voltage components.

A simple selection workflow

  1. Shortlist solvents that dissolve your polymer at room temperature.
  2. Remove options that conflict with your application, such as residual-solvent limits for biomedical use.
  3. Run short trials at two or three concentrations and inspect fibers under a microscope.
  4. Fine-tune with co-solvents or conductivity additives.