The BAXIT BXT-N9-D nano particle size and zeta potential analyzer is a laboratory-grade 3-in-1 instrument that combines Dynamic Light Scattering (DLS), Electrophoretic Light Scattering (ELS) and Static Light Scattering (SLS) in a single benchtop platform. In one test run it determines particle size distribution across 0.5 nm to 10,000 nm, zeta potential, polymer molecular weight and the second virial coefficient, making it the most widely adopted tool for colloidal stability assessment in modern laboratories. The instrument is built around a Hamamatsu photomultiplier tube, a 532 nm solid-state laser and a 512-channel high-speed digital correlator, delivering an accuracy error below 1% and a repeatability error of only 0.66%, fully compliant with GB/T 29022-2021 and ISO 22412:2017. Dual constant-temperature systems keep the laser and sample cell stable between 5 °C and 90 °C with ±0.1 °C precision, enabling reliable measurements for biopharmaceuticals, nano materials, coatings, fine chemicals and food products across research, development and routine quality control. The optional 40 μL micro cuvette and U-shaped capillary electrode further support trace-sample and fast zeta potential testing in demanding industrial environments.

A nano particle size and zeta potential analyzer is an optical characterization instrument that determines both the physical size and the surface charge of colloidal particles suspended in a liquid medium. The BAXIT BXT-N9-D applies three complementary light-scattering techniques, each defined by precise physical principles.

In Dynamic Light Scattering (DLS), a 532 nm solid-state laser beam illuminates the sample, and the intensity fluctuations of scattered light caused by Brownian motion are captured at a 90° scattering angle and processed by a 512-physical-channel digital correlator with sampling time adjustable from 0.1 μs to 1 ms. The autocorrelation function yields the translational diffusion coefficient, and the hydrodynamic diameter is calculated through the Stokes–Einstein equation, giving the complete particle size distribution with D10, D50 and D90 values and the polydispersity index (PDI).

In Electrophoretic Light Scattering (ELS), charged particles migrate under an applied electric field, and the Doppler frequency shift of the scattered light is captured at a 12° scattering angle. The electrophoretic mobility is converted into zeta potential through the Henry equation, a direct and quantitative indicator of colloidal stability and agglomeration tendency. The U-shaped capillary electrode design and fast cosine-fitting algorithm reduce electrode polarization and shorten measurement time, extending electrode service life.

In Static Light Scattering (SLS), the scattered light intensity of serially diluted samples is plotted on a Debye curve to determine polymer molecular weight from 340 Da to 2×10⁷ Da and the second virial coefficient for protein and polymer research. The optical system is completed by a Hamamatsu photomultiplier tube with ultra-low dark count, an automatic 0–100% stepless light-intensity adjustment, and dual constant-temperature systems controlling the laser and sample cell from 5 °C to 90 °C with ±0.1 °C precision. Typical outputs include particle size distribution curves, cumulative volume tables, zeta potential distribution data and a complete, editable standardized test report for laboratory filing and third-party inspection.

Colloidal instability is one of the most expensive hidden problems in industrial manufacturing. Particles that agglomerate, sediment or change surface charge during storage cause batch-to-batch inconsistency, field failures, rejected shipments and wasted research and development cycles. In biopharmaceuticals, an unstable nano-drug delivery system directly lowers bioavailability and shortens shelf life; in coatings, pigment agglomeration destroys color strength and gloss; in food emulsions, phase separation leads to visible creaming; in fine chemicals, silica sol and ceramic slurries settle and clog production lines. Measuring particle size alone is not enough, because two batches with identical size distributions can behave completely differently when their surface charge differs. That is why leading quality-control laboratories pair particle sizing with zeta potential measurement on the same sample to predict dispersion stability, optimize formulation and prevent batch rejection before products leave the factory. The financial impact is direct: a single rejected nano-emulsion batch can cost more than the instrument itself, and repeated trial-and-error formulation work consumes weeks of engineer time. Regulatory bodies including the FDA, EMA and NMPA increasingly require particle size distribution and zeta potential data for nano-drug formulations, vaccine adjuvants and nano-carrier products, making a reliable characterization instrument a compliance necessity rather than an optional upgrade.

The BXT-N9-D addresses these pain points with four core advantages. First, its 3-in-1 design integrates DLS, ELS and SLS in one platform, covering particle size, zeta potential and molecular weight simultaneously, which reduces equipment cost, laboratory footprint and operator training time. Second, it is calibrated across the full 0.5 nm to 10,000 nm range with NIST-traceable standard particles; the accuracy error is less than 1%, fully compliant with ISO 22412:2017 and GB/T 29022-2021, so the data withstand audits, customer reviews and third-party inspection. Third, the ±0.1 °C constant-temperature system and the Hamamatsu PMT eliminate drift caused by viscosity and Brownian-motion changes, achieving a repeatability error of only 0.66% over six parallel runs of the same sample. Fourth, the fast cosine-fitting algorithm shortens zeta potential testing, protects the U-shaped capillary electrode for a longer service life, and the optional 40 μL micro cuvette allows trace and precious samples to be measured without dilution. Every result is exported as an editable, standards-compliant report, strengthening product quality control and R&D efficiency at the same time. For contract laboratories, raw-material suppliers and regulatory-driven industries, the documented calibration chain and standardized report format also satisfy pharmacopoeia-aligned documentation requirements, making the instrument a defensible, future-proof investment for any laboratory seeking ISO-compliant colloidal characterization and dispersion stability analysis.

The BXT-N9-D is designed for routine operation that any laboratory technician can master. The workflow is straightforward: prepare the sample, select the cuvette (4 mL polystyrene, 4 mL quartz or the 40 μL micro cuvette), load the sample, set the temperature and measurement count in the software, and start the automatic test. For maximum confidence, users can run the calibration verification with NIST-traceable standard particles whenever the cuvette type is changed or on a monthly schedule. The instrument then generates particle size distribution curves, cumulative volume tables, zeta potential distribution data and the Debye curve for molecular weight, and exports a complete report containing sample information, test temperature, D10/D50/D90, PDI and statistical data. For process control and stability studies, the software supports temperature trend tests and time-stability trend tests, allowing users to simulate storage conditions across the full 5 °C to 90 °C range while the instrument maintains ±0.1 °C precision. Practical operation is guided by the software: users define the number of parallel runs, the temperature equilibrium time before each measurement and the data-reporting format, and the system automatically rejects outlying counts with clear on-screen statistics. With a 100 Mbps data-processing speed and a linear dynamic range above 10¹¹, even ultra-fine signals from trace concentrations are resolved without distortion, and the 512 physical channels output complete autocorrelation curves for every particle size.

In biopharmaceutical research and quality control, the analyzer characterizes liposomes, proteins, antibodies, viruses, vaccine adjuvants and nano-drug delivery systems. A typical injectable liposome formulation of around 150 nm with a PDI below 0.2 and a zeta potential above ±30 mV indicates a stable dispersion; for mRNA-LNP vaccines, the instrument routinely tracks particles in the 80–100 nm range, and the 40 μL micro cuvette preserves precious biological samples while the temperature trend function simulates long-term storage stability. In nano materials, it measures nano metal oxides, carbon nanotubes, quantum dots, nano powders and composite colloids, with a sample concentration range from 0.1 mg/mL up to 40% w/v, so high-solid slurries can be tested directly or after controlled dilution. In coatings, inks and paints, it monitors pigment dispersion, carbon black slurry and water-based coating suspensions; the conductivity range of 0 to 270 mS/cm and the zeta potential applicability for particles from 1 nm to 120 μm cover nearly every industrial colloid, from transparent nano emulsions to opaque ceramic slurries and battery electrode slurries. In fine chemicals and food, it supports silica sol, ceramic slurry, surfactants, emulsifiers, nano food additives and cosmetic nano lotions, while aerospace and defense laboratories use it for special functional nano composites and military colloidal materials. Quality managers also rely on the instrument to verify incoming raw-material particle size before production, reducing rework and protecting finished-product consistency across seasons and suppliers. Powered by a universal 100–240 V AC input with full DC 12 V/10 A power supply and a compact 650 × 410 × 200 mm footprint of only 20 kg, the instrument fits seamlessly onto any laboratory bench and operates stably in ambient conditions from 5 °C to 45 °C with non-condensing humidity up to 85%, backed by remote installation support and online technical training from the BAXIT service team.

Q1: What particle size range can the BXT-N9-D measure?

A1: The BXT-N9-D measures particle size from 0.5 nm to 10,000 nm at a 90° scattering angle, supporting sample concentrations from 0.1 mg/mL to 40% w/v. The accuracy error is below 1%, verified with NIST-traceable standard particles across the full measuring range, and the repeatability error is confirmed at only 0.66% in six parallel runs.

Q2: Can one instrument test particle size, zeta potential and molecular weight?

A2: Yes. DLS, ELS and SLS are integrated in one platform, so particle size, zeta potential, molecular weight and the second virial coefficient are measured with a single instrument, eliminating extra equipment purchases, additional operator training, repeated sample preparation and cross-instrument data inconsistency. Users simply switch modules in the software between size, charge and molecular-weight measurements.

Q3: How does the temperature control improve measurement reliability?

A3: Dual constant-temperature systems keep the laser and sample cell at 5–90 °C with ±0.1 °C precision, eliminating deviation caused by viscosity and Brownian-motion changes. Six parallel runs on the same sample show a repeatability error of only 0.66%, far below the 1% industry benchmark and fully traceable in the exported report.

Q4: Which international standards does the instrument comply with?

A4: The BXT-N9-D instrument meets GB/T 29022-2021, ISO 22412:2017 and related ISO standards. It is calibrated with NIST-traceable standard particles and ships with a calibration certificate accepted by customer audits, regulatory filings and third-party laboratories, supporting export compliance and end-user documentation requirements. The full calibration chain is documented for complete traceability.

Q5: What is the minimum sample volume required?

A5: With the optional 40 μL micro cuvette, only a few dozen microliters of sample are needed for a complete measurement, making the analyzer ideal for precious proteins, antibodies, vaccines and rare nano materials that cannot be wasted, diluted or re-produced, and the same sample can be returned for downstream assays.

Q6: What delivery and after-sales support does BAXIT provide?

A6: BAXIT offers a one-year full machine warranty, lifetime paid maintenance, free remote installation and operation training, 24-hour global online technical support, and flexible payment terms including T/T, L/C and Trade Assurance for secure international procurement and on-time delivery worldwide. Spare parts are supplied at cost price to guarantee long instrument life.

The BAXIT BXT-N9-D nano particle size and zeta potential analyzer combines DLS, ELS and SLS in one standards-compliant instrument, delivering particle size from 0.5 nm to 10,000 nm, zeta potential, molecular weight and reproducible data with only 0.66% repeatability error. It turns complex colloidal characterization into a routine, audit-ready procedure: one instrument, one operator workflow, and one standardized report for particle size distribution, surface charge and molecular weight. Whether you are developing nano drugs, optimizing coatings and inks, or auditing raw materials for quality control, this single benchtop system replaces multiple instruments and gives your customers defensible, audit-ready results that meet ISO 22412:2017 and GB/T 29022-2021 requirements. For distributors, OEM partners and end laboratories alike, the BXT-N9-D is a dependable, cost-effective addition to any instrument portfolio. Contact the BAXIT engineering team today for a quotation, a full product catalog, free sample testing or a customized configuration, and our specialists will reply within 24 hours to help you select the right solution for your laboratory.