Electrospinning device and nanofiber manufacturing device provided with same

An electrospinning device comprising an electrode having a concave curved surface on an inner wall, wherein the concave curved surface is curved at every portion, and a needle-shaped spinning nozzle surrounded by the concave curved surface of the electrode and being configured to jet a spinning solution from a tip of the nozzle with an electric field applied between the electrode and the nozzle to form a nanofiber from the jetted spinning solution,

• the concave curved surface of the electrode having an open end defining a circle, with:
• the nozzle being located in such a manner that a direction in which the nozzle extends passes through the center of said circle defined by the open end of the concave curved surface of the electrode, and
• the tip of the nozzle is positioned in a plane including said circle defined by the open end of the concave curved surface of the electrode, or is positioned inside the concave curved surface from said plane;
• the concave curved surface has a curvature such that a normal at every position of the concave curved surface passes through the tip of the nozzle;
• and
• wherein the electrode and the nozzle are electrically insulated from each other by a support.

An electrospinning device comprising an electrode having a concave curved surface on an inner wall, wherein the concave curved surface has a shape of true hemispherical shell, and a needle-shaped spinning nozzle surrounded by the concave curved surface of the electrode and being configured to jet a spinning solution from a tip of the nozzle with an electric field applied between the electrode and the nozzle to form a nanofiber from the jetted spinning solution,

• the concave curved surface of the electrode having an open end defining a circle, with:
• (1) the nozzle being located in such a manner that a direction in which the nozzle extends passes through the center of said circle defined by the open end of the concave curved surface of the electrode, and that the tip of the nozzle is positioned in a plane including the circle defined by the open end of the concave curved surface of the electrode, or is positioned inside the concave curved surface from said plane, or
• (2) the nozzle being located in such a manner that a direction in which the nozzle extends passes within an imaginary circle, the imaginary circle being drawn on the same plane including said circle defined by the open end of the of the concave curved surface of the electrode, being concentric with said circle, and having a radius of r/5, wherein r is the radius of said circle defined by the open end of the concave curved surface of the electrode, and the tip of the nozzle is positioned in a plane including said circle defined by the open end of the concave curved surface of the electrode, or is positioned inside the concave curved surface from said plane;
• and
• wherein the electrode and the nozzle are electrically insulated from each other by a support.

An electrospinning device comprising an electrode having a concave curved surface on an inner wall, wherein the concave curved surface is curved at every portion, and a needle-shaped spinning nozzle surrounded by the concave curved surface of the electrode and being configured to jet a spinning solution from a tip of the nozzle with an electric field applied between the electrode and the nozzle to form a nanofiber from the jetted spinning solution,

• the concave curved surface of the electrode having an open end defining a circle, with:
• the nozzle being located in such a manner that a direction in which the nozzle extends passes through the center of said circle defined by the open end of the concave curved surface of the electrode, and that the tip of the nozzle is positioned in a plane including the circle defined by the open end of the concave curved surface of the electrode, or is positioned inside the concave curved surface from said plane;
• and
• wherein:
• the nozzle is insulated,
• said electrode has an inner surface area of 400 mm2 to 180000 mm2,
• said tip of the nozzle contains a metallic part (conductive part) having a surface area of 2 mm2 to 1000 mm2 that is exposed to the inner surface area of the electrode, and
• a ratio of the said inner surface area of the electrode to the surface area of the tip of the nozzle exposed to the inner surface of the electrode is 30 to 90000.