Abstract: A microfluidic device includes a chamber having sidewalls, a floor, a ceiling, and an inlet. The microfluidic device includes pillars extending from the floor to the ceiling of the chamber. Each pillar has an orientation relative to the inlet defined by a leading surface and a trailing corner opposite the leading corner. The trailing corner has an angle less than a threshold angle that is based on a fluidic contact angle. The orientations of the pillars relative to the inlet promote fluid flow from the inlet throughout the chamber without trapping gas at the sidewalls of the chamber.

Abstract: An immiscible droplet generation system may include a chip, a microfluidic channel integrated into the chip, an input to the microfluidic channel through which the microfluidic channel is to be filled with a first fluid that is to be moved through the microfluidic channel and a droplet generator. The droplet generator is integrated into the chip to generate a droplet of a second fluid, immiscible within the first fluid, and to inject the droplet into the first fluid in the microfluidic channel.

Abstract: In one example in accordance with the present disclosure, a device for conducting a reaction with a fluid sample is described. The device includes: a microfluidic channel; a number of heating elements along the microfluidic channel; and an inertial pump at each of opposite ends of the microfluidic channel to oscillate the fluid sample along the microfluidic channel.

Abstract: An example microfluidic mixer can include an inlet microfluidic channel portion and a fluid splitting channel portion including an overpass microfluidic channel to receive fluid from a first side of the inlet microfluidic channel portion and an underpass microfluidic channel to receive fluid from a second side of the inlet microfluidic channel portion, where the underpass microfluidic channel extends under the overpass microfluidic channel such that the channels overlap at their respective downstream ends. A fluid recombining channel portion is downstream of the fluid splitting portion and includes an angled recombining surface having an acute angle with respect to a direction of fluid flow, where the angled recombining surface is between the downstream ends of the overpass and underpass microfluidic channels. An outlet microfluidic channel portion is fluidly connected downstream from the fluid recombining channel portion.

Abstract: In one example in accordance with the present disclosure, a thermal cycling device is described. The thermal cycling device includes a fluid chamber to retain a fluid. A heating element is disposed around multiple sides of a cross-sectional perimeter of the fluid chamber and an insulator is disposed around multiple sides of a cross-sectional perimeter of the heating element. The thermal cycling device also includes a conductive body disposed around multiple sides of a cross-sectional perimeter of the insulator.

Abstract: An example microfluidic structure can include a first microfluidic channel segment in a first elevation plane, a second microfluidic channel segment in a second elevation plane, and a transverse microfluidic channel segment connecting the first microfluidic channel segment to the second microfluidic channel segment. An interior pillar can be positioned at the transverse microfluidic channel segment. The interior pillar can have a tapered downstream edge. The tapered downstream edge can be angled in the first or second elevation plane at an acute angle. A fluid cross-sectional area can increase in the fluid flow direction along the tapered downstream edge.

Abstract: An example microfluidic structure can include a first microfluidic channel segment in a first elevation plane, a second microfluidic channel segment in a second elevation plane, and a transverse microfluidic channel segment connecting the first microfluidic channel segment to the second microfluidic channel segment. An angled exterior wall segment can be at the transverse microfluidic channel segment. The angled exterior wall segment can be angled in the first or second elevation plane at an acute angle with respect to a direction of fluid flow through the first or second microfluidic channel segment. A fluid cross-sectional area can increase in the fluid flow direction along the angled exterior wall segment.

Abstract: An immiscible droplet generation system may include a chip, a microfluidic channel integrated into the chip, an input to the microfluidic channel through which the microfluidic channel is to be filled with a first fluid that is to be moved through the microfluidic channel and a droplet generator. The droplet generator is integrated into the chip to generate a droplet of a second fluid, immiscible within the first fluid, and to inject the droplet into the first fluid in the microfluidic channel.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A slot extender includes a reservoir. The reservoir includes a reservoir floor defining a drain opening, a continuous reservoir sidewall extending from the reservoir floor, and a concave fillet running along at least a portion where the reservoir sidewall joins the reservoir floor. The concave fillet has a variable radius.

Abstract: A fluid ejection cartridge includes a body, having fluid passageways at a first spacing, a die, having fluid passage-ways at a second closer spacing, and an interposer, bonded to the body at a first surface and plasma bonded to the die at a second surface. The interposer includes fluid passageways between the first and second surfaces, which are substantially aligned with the respective passageways of the body and the die.

Abstract: A fluid ejection cartridge includes a body, having fluid passageways at a first spacing, a die, having fluid passage-ways at a second closer spacing, and an interposer, bonded to the body at a first surface and plasma bonded to the die at a second surface. The interposer includes fluid passageways between the first and second surfaces, which are substantially aligned with the respective passageways of the body and the die.

Abstract: An inkjet material dispenser system includes a printhead member. According to one exemplary embodiment, the printhead member includes at least one drop ejector including an insulating stack layer and a top orifice surface defining an orifice, wherein a ratio of a diameter of the orifice to a height of the insulating stack layer (O/L ratio) is at least 1.0.

Abstract: A fuel cell system in accordance with a present invention includes a fuel supply apparatus that supplies at least one reactant in a pulse.

Abstract: An inkjet carriage for holding an inkjet pen includes an airflow reducing member configured and positioned to at least partially block airflow between an inkjet ejection nozzle of a pen on the carriage and an object to be printed upon during carriage movement.