Piezoelectric Nanoliter Microplate Dispenser

What is the Piezoelectric Nanoliter Microplate Dispenser?

A piezoelectric nanoliter microplate dispenser ejects picoliter to nanoliter droplets from glass nozzles by voltage-driven pressure pulses, placing very small volumes into high-density plates without contact. It is used for assay miniaturization and compound or reagent addition with minimal consumption.

Overview

Piezoelectric dispensing uses a piezo element around a glass capillary that contracts when voltage is applied, sending a pressure wave that expels a droplet of about 100 picoliters to a few nanoliters. Droplet volume is set by waveform, voltage and nozzle diameter, and thousands of droplets can be combined to make up to several microliters. Because there is no contact, tip costs and carryover are eliminated, and precision at volumes below 100 nanoliters is achievable with coefficient of variation under about 5 percent, using drop-detection cameras to verify ejection. Single-, 8- or 96-nozzle heads work with 384- and 1536-well plates, and the liquids can include DMSO solutions. Limitations include sensitivity to viscosity, particulates and air bubbles, the need for filtered reagents and higher instrument cost than peristaltic or syringe systems.

How does it work?

Microplate dispensers move liquid from a reservoir to the wells through tubing and a dispensing head. Peristaltic dispensers squeeze flexible tubing with rollers, delivering volume proportional to pump rotation, and they keep the liquid path disposable. Syringe dispensers use a precision plunger to aspirate and dispense volume with high accuracy. Solenoid valve systems pressurize a reagent line and open a microvalve for a precisely timed pulse, delivering nanoliter to microliter volumes, and piezoelectric systems eject droplets by a voltage-driven pressure wave for non-contact dispensing. Multi-channel heads of 8, 16 or 96 nozzles fill rows, columns or entire plates, and plate carriers move wells beneath the nozzles. Priming, backflush and cleaning cycles prevent carryover, and volume accuracy depends on viscosity, tubing and temperature.

What are the key features?

• Non-contact droplet ejection from picoliter to nanoliter scale
• No tips and no carryover between wells
• Drop-detection camera verifies droplet formation
• Single-, 8- or 96-nozzle heads for 384- and 1536-well plates
• Compatible with DMSO compound solutions
• Volumes assembled from droplets up to several microliters

What are the technical specifications?

A typical piezoelectric nanoliter microplate dispenser configuration offers droplet volume of 100 pL–5 nL, total dispense volume of 10 nL–5 µL per well, precision (CV) of < 5% (≥ 50 nL), nozzle heads of 1, 8 or 96 nozzles, plate formats of 96-, 384-, 1536-well and drop verification of Camera-based drop detection. Values are indicative of the product class; the exact figures for each configuration are confirmed on the quotation and the calibration documents supplied with the instrument.

Which applications is it used for?

The Piezoelectric Nanoliter Microplate Dispenser is used in assay miniaturization in 1536-well plates, compound dose-response plating, nanoliter reagent addition, genomic assay and PCR plate setup and low-volume biochemical screening. Across the wider Microplate Dispensers class, laboratories also deploy it for ELISA reagent and substrate addition, cell seeding and media addition and high-throughput screening reagent dispensing.

Which standards and certifications apply?

Relevant standards and methods include ISO 8655 (piston-operated volumetric apparatus, gravimetric method), ANSI/SLAS 1-2004 to 4-2004, IEC 61010-1, IEC 61010-2-081 and IEC 61326-1. Certification candidates for this model are CE, ISO 9001 manufacturing and RoHS; each is to be confirmed for the specific configuration before shipment, and certificates are supplied only where they have been issued.

Prime every line before use and flush with water or an appropriate solvent after each run to prevent crystallization and cross-contamination. Verify dispensed volume gravimetrically or photometrically with dye at installation and at least annually, across all channels and at your working volumes. Replace peristaltic tubing according to its life, typically after a set number of hours, because wear changes volume. Avoid air bubbles by degassing liquids and checking connections. Use tubing rated for your reagents, and follow biosafety rules when dispensing infectious materials. Keep a log of maintenance and calibration for quality records.

How do I select the right Piezoelectric Nanoliter Microplate Dispenser?

Choose this variant when assays are miniaturized to nanoliter volumes and reagent savings justify higher instrument cost. For microliter-scale bulk additions, peristaltic or syringe dispensers are more practical. In an RFQ specify droplet volume range, nozzle count, liquids and viscosity, plate formats and verification requirements.

How does it compare with other Microplate Dispensers variants?

Choose a dispenser by dispensed volume range, accuracy, liquids and throughput. Peristaltic models are economical and simple for buffers and substrates at 5 to 2,000 microliters, while syringe models give better accuracy for varied reagents. Non-contact valve or piezo systems suit nanoliter volumes and 1536-well plates. For cell suspensions, select gentle, low-shear paths with mixing to keep cells suspended. Compare coefficient of variation at your typical volume, dead volume and cleaning procedure, because expensive reagents are lost in tubing. Check plate formats, number of channels, reagent bottles and whether the system integrates into an automation line. Confirm chemical compatibility of tubing and seals with solvents such as DMSO or ethanol.