An apparatus is provided for generating water droplets. The apparatus includes: a condensation rod for condensing water vapor in air surrounding the condensation rod on the condensation rod; a cooling device being in contact with the condensation rod for cooling the condensation rod; a discharge electrode group including a first electrode and a second electrode cooperating with each other, the first electrode and the second electrode being disposed laterally, and the first electrode and the second electrode are respectively disposed on both sides of the condensation rod; and a high voltage power supply for applying a high voltage to the discharge electrode group to generate a high voltage corona between the first electrode and the second electrode; where the discharge electrode group applies the high voltage corona to the condensation rod, so that condensed water on the condensation rod is excited by the high voltage corona to form atomized water droplets.

An apparatus for accumulating cross-aligned fiber in an electrospinning device, comprising a multiple segment collector including at least a first segment, a second segment, and an intermediate segment, the intermediate segment positioned between the first and second segment to collectively present an elongated cylindrical structure; at least one electrically chargeable edge conductor circumferentially resident on the first segment and circumferentially resident on the second segment; a connection point on the first segment and on the second segment, the connection points usable for mounting the elongated cylindrical structure on a drive unit to rotate around a longitudinal axis; the elongated cylindrical structure holding electrospun fiber substantially aligned with the longitudinal axis when the edge conductors are excited with a charge of opposite polarity relative to charged fiber, and attracting electrospun fiber on to its surface around the longitudinal axis at least when the edge conductors are absent a charge or grounded.

A method and apparatus for fabricating multifunction membranes comprising cross-aligned nanofiber in an electrospinning device, the method comprising providing a multiple segment collector including at least a first segment, a second segment, and an intermediate segment to collectively present an elongated cylindrical structure; electrically charging an edge conductor circumferentially resident on the first segment and on the second segment; rotating the elongated cylindrical structure on a drive unit around a longitudinal axis; the elongated cylindrical structure holding electrospun fiber substantially aligned with the longitudinal axis when the edge conductors are excited with a charge of opposite polarity relative to charged fiber, and attracting electrospun fiber on to its surface around the longitudinal axis at least when the edge conductors are absent a charge or grounded and a charged electrode is positioned opposite a fiber emitter; and repeating the process multiple times to form layers of nanofibers encapsulating agents of interest.

An apparatus for accumulating cross-aligned fiber in an electrospinning device, comprising a multiple segment collector including at least a first segment, a second segment, and an intermediate segment, the intermediate segment positioned between the first and second segment to collectively present an elongated cylindrical structure; at least one electrically chargeable edge conductor circumferentially resident on the first segment and circumferentially resident on the second segment; a connection point on the first segment and on the second segment, the connection points usable for mounting the elongated cylindrical structure on a drive unit to rotate around a longitudinal axis; the elongated cylindrical structure holding electrospun fiber substantially aligned with the longitudinal axis when the edge conductors are excited with a charge of opposite polarity relative to charged fiber, and attracting electrospun fiber on to its surface around the longitudinal axis at least when the edge conductors are absent a charge or grounded.

An electrostatic painting device capable of reducing any AC or electromagnetic emissions when the device is powered on is provided. The emissions affect electronic components present during painting of various objects or even when the device is powered on. The electromagnetic induction into the conductive circuit elements in turn induces voltages and currents, which potentially harm the micro-electronic circuits. One such device includes a choke between a fluid tip and a high voltage source of the device to reduce these emissions. The voltage source may include at least one capacitor which supplies the AC emissions representing electromagnetic emissions risk during the discharge of paint from the device. The choke connected to the voltage source substantially reduces the emissions involved during the paint discharge, while allowing the discharge of electrons, thereby imparting negative DC charge to the paint and the workpiece, and preventing damage to electronic circuits during the process.

An electrostatic painting device capable of reducing any AC or electromagnetic emissions when the device is powered on is provided. The emissions affect electronic components present during painting of various objects or even when the device is powered on. The electromagnetic induction into the conductive circuit elements in turn induces voltages and currents, which potentially harm the micro-electronic circuits. One such device includes a choke between a fluid tip and a high voltage source of the device to reduce these emissions. The voltage source may include at least one capacitor which supplies the AC emissions representing electromagnetic emissions risk during the discharge of paint from the device. The choke connected to the voltage source substantially reduces the emissions involved during the paint discharge, while allowing the discharge of electrons, thereby imparting negative DC charge to the paint and the workpiece, and preventing damage to electronic circuits during the process.

Electrospray devices are described. The devices may comprise a substrate and a plurality of emitters. The emitters may comprise a plurality of channels therein, wherein the channels may be configured to convey immiscible liquids to the distal end of the emitters. The channels may be arranged such that, at the distal end, one liquid enclosed another liquid. The device may comprise a plurality of reservoirs, each reservoir being configured to contain liquid therein and to convey the liquid to a respective channel. Core-shell droplets may be formed by forming Taylor cones through the application of an electric field. The core-shell droplets may include a core liquid enclosed within a shell liquid, wherein the two liquids may be immiscible.

An apparatus for accumulating cross-aligned fiber in an electrospinning device, comprising a multiple segment collector including at least a first segment, a second segment, and an intermediate segment, the intermediate segment positioned between the first and second segment to collectively present an elongated cylindrical structure; at least one electrically chargeable edge conductor circumferentially resident on the first segment and circumferentially resident on the second segment; a connection point on the first segment and on the second segment, the connection points usable for mounting the elongated cylindrical structure on a drive unit to rotate around a longitudinal axis; the elongated cylindrical structure holding electrospun fiber substantially aligned with the longitudinal axis when the edge conductors are excited with a charge of opposite polarity relative to charged fiber, and attracting electrospun fiber on to its surface around the longitudinal axis at least when the edge conductors are absent a charge or grounded.

An apparatus is provided for generating water droplets. The apparatus includes: a condensation rod for condensing water vapor in air around the condensation rod on the condensation rod, the condensation rod being a cylinder that is rotationally symmetric about a central axis, and a circumferential surface of the cylinder being a condensing surface for aggregating condensed water; a cooling device being in contact with the condensation rod for cooling the condensation rod; an atomizing electrode; and a high voltage power supply for applying a high voltage to the atomizing electrode, and causing the condensed water on the condensation rod to be excited by a high pressure corona to form atomized water

A method for controlling fiber cross-alignment in a nanofiber membrane, comprising: providing a multiple segment collector in an electrospinning device including a first and second segment electrically isolated from an intermediate segment positioned between the first and second segment, collectively presenting a cylindrical structure, rotating the cylindrical structure around a longitudinal axis proximate to an electrically charged fiber emitter; electrically grounding or charging edge conductors circumferentially resident on the first and second segment, maintaining intermediate collector electrically neutral; dispensing electrospun fiber toward the collector, the fiber attaching to edge conductors and spanning the separation space between edge conductors; attracting electrospun fiber attached to the edge conductors to the surface of the cylindrical structure, forming a first fiber layer; increasing or decreasing rotation speed of the cylindrical structure to alter the angular cross-alignment relationship between aligned nanofibers in adjacent layers, the rotation speed being altered to achieve a target relational angle.