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Monodisperse nanoparticles are particle populations with a relatively narrow size distribution rather than particles that are exactly identical. MKnano lists monodisperse nanoparticle families including gold, silver, platinum, alumina, iron oxide, silica, and titania.

What should you compare first?
For technical selection, compare the stated particle size, measurement method, particle-size distribution, morphology, supply form, surface chemistry, and current documentation for the exact grade being evaluated.

MATERIAL FAMILIES
Gold · Silver · Platinum · Alumina · Iron oxide · Silica · Titania

SELECT BY
Material · Particle size · CV / size distribution · Morphology · Surface chemistry · Powder / dispersion

DOCUMENTATION
Current SDS · COA · Product specification / TDS · Characterization data where available

PROCUREMENT
Confirm availability, quantity, pricing and destination-specific shipping information.

MEASUREMENT NOTE
TEM, SEM and DLS values are not interchangeable. Use the method stated for the exact grade.

SELECTION NOTE
Do not assume every monodisperse product has the same distribution, surface chemistry, or supply form.

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Available Monodisperse Nanoparticle Products

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MKNano
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sku: MKN-Au-Sxxx

Monodisperse, Uniform, Spherical naoparticles

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Monodisperse, Uniform, Spherical naoparticles
Truely uniform and monodisperse Spherical Gold nanoparticles in aqueous mediaThe particles have a very narrow size distribution ( CV between 5% and 15% depending on size ) The solutions are...

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Find a Monodisperse Nanoparticle Grade by Specification

Selection Factor	What to Verify
Material	Gold, silver, platinum, alumina, iron oxide, silica or titania.
Particle size	Confirm the size reported and the analytical method used to determine it.
Size distribution	Where available, evaluate standard deviation, coefficient of variation (CV), DLS polydispersity index (PDI), percentiles, or other distribution information.
Morphology	Please confirm if the selected grade is described as nanosphere, sphere or other morphology.
Supply form	Check whether the product in question is supplied as a powder or dispersion.
Dispersion medium	For liquid products, verify the indicated solvent or carrier medium and concentration where applicable.
Surface chemistry	Check the stated coating, stabilizer, ligand or functional group of the selected grade.
Documentation	Review current SDS, TDS/specification, COA and any characterization data available.
Procurement	Confirm availability, current pricing and shipping terms to specific destinations.

Important: Do not assume that every product in the monodisperse category has the same size distribution, measurement method, or surface chemistry.

What Are Monodisperse Nanoparticles?

Monodisperse nanoparticles are particle populations in which the particles are nearly the same size on a defined measurement basis. The term does not mean that every nanoparticle has an exactly identical diameter.

How Is Nanoparticle Monodispersity Measured?

There is no single number or analytical methodology that adequately describes nanoparticle monodispersity. Different methods measure different physical quantities. The measurement technique must be stated.

Coefficient of Variation (CV)

No single analytical technique can completely describe a nanoparticle population. The method must be specified because different methods measure different physical quantities.

Coefficient of Variation (CV)

CV (%) = Standard Deviation ÷ Mean Particle Diameter × 100.
A smaller CV indicates a tighter distribution for otherwise comparable measurements. A CV from microscopy should not be confused with a DLS PDI.

DLS Polydispersity Index (PDI)

Dynamic light scattering measures the diffusion of particles in a liquid and gives an average hydrodynamic particle size and distribution information. The DLS PDI is part of that measurement scheme and should not be casually converted to a microscopy-derived CV.

Method	Primary quantity	Useful for	Important limitation
TEM	Projected physical particle dimensions	Particle size, morphology and number-based distribution analysis	Prepared/deposited sample; does not independently describe solution-state dispersion.
SEM	Projected dimensions and surface morphology	Size and shape analysis for suitable particles and nanospheres	Method suitability depends on particle size, contrast, and specimen preparation.
DLS	Hydrodynamic size in liquid	Dispersion-state and aggregation screening	Not equivalent to TEM core size; large scatterers can influence the result strongly.
UV-Vis	Optical absorption/extinction response	Useful fingerprint for applicable plasmonic materials	Indirect size evidence; affected by shape, medium, and aggregation.
Zeta potential	Electrokinetic potential under stated conditions	Colloidal behaviour under the stated conditions	Not a direct measure of monodispersity.
XRD	Crystal phase and coherent crystallite information	Structural and phase characterization	Does not directly prove a narrow particle-size distribution.

Why Can TEM and DLS Report Different Nanoparticle Sizes?

TEM and DLS can give different sizes because they measure different physical entities. TEM measures projected physical dimensions on a prepared specimen, while DLS measures hydrodynamic behavior in a liquid.

Particle Core → Surface Layer / Ligand → Solvation Environment → Hydrodynamic Diameter

The DLS result can be affected by surface coatings, ligands, solvent interactions and aggregation state. The fact that the TEM and DLS values differ does not automatically imply that one of the measurements is incorrect.

Monodisperse vs Polydisperse Nanoparticles: What Is the Difference?

A monodisperse or narrow particle population has particle sizes more closely clustered around some central value. A polydisperse population is one that exhibits a wider range of sizes. Neither classification is automatically suitable or unsuitable for any application.

Factor	Monodisperse / Narrow Distribution	Broader / Polydisperse Distribution
Particle sizes	Cluster more closely around a central size	Cover a wider particle-size range
Size-dependent research	Can make particle-size-dependent effects easier to isolate	Measured response may reflect a broader range of particle sizes
Optical response	May reduce the contribution of size variation to ensemble broadening	Greater size variation can contribute to broader ensemble response
Particle packing	Narrow distributions may support more regular packing in suitable systems	Wider size variation can alter packing behavior
Suitability	Depends on material, experimental objective, formulation and operating conditions	Depends on material, experimental objective, formulation and operating conditions

How to Select the Right Monodisperse Nanoparticle Grade

Choose the grade that best matches the material, particle size, measurement basis, morphology, supply form, surface chemistry, and documentation to the requirements for the planned evaluation.

1. Select the Material

Begin with the chemistry needed for the research or engineering goal. The choice of a nanoparticle should not be based on the availability of a smaller nominal particle size.

2. Define the Particle-Size Requirement

Consider whether the work is based on a property that depends on size: surface area, optical response, magnetic behavior, particle packing, suspension behavior, matrix interaction, or another property.

3. Confirm the Measurement Method

Determine if the given size was obtained by TEM, SEM, DLS or another method. Values obtained by different techniques are not comparable as being equivalent.

4. Review the Distribution Data

Check mean particle size, standard deviation, CV, DLS PDI, percentiles, or a particle-size histogram where available.

5. Confirm Morphology

Monodispersity is important primarily for the particle-size population. It does not in itself prove that all particles have the same morphology.

6. Select Powder or Dispersion

Confirm the actual form of supply of the selected product. Check the medium, concentration, and stated surface chemistry for dispersions. Handling and preparation information for powders can be found in the current product documentation.

7. Review Surface Chemistry

Particle interactions and downstream formulation can be affected by coatings, ligands, stabilizers, and functional groups. Availability depends on specific material and grade.

8. Review Current Documentation

Review the applicable SDS, product specification or TDS, COA, and characterization information available for the selected product prior to purchase or evaluation.

Why Can Particle-Size Uniformity Matter in Research?

Uniformity in particle size may help reduce size distribution as an uncontrolled experimental variable. The importance of this uniformity is material, formulation, experimental design, and operating conditions.

Catalysis Research

The exposed surface structures and the relative distribution of different surface sites can be influenced by the nanoparticle sizes. The ability to generate narrower particle populations could be helpful for studying particle-size-dependent catalytic behavior under well-defined experimental conditions. The effect is specific to the material, reaction, and conditions.

Plasmonic and Optical Research

For materials such as gold and silver nanoparticles, the optical response can depend upon particle size, shape, surrounding medium, and aggregation state. So particle size variation can lead to variation in an ensemble optical response.

Colloidal Self-Assembly

Particle-size distribution can influence how colloidal particles pack and organize. Model-colloid and self-assembly experiments often use narrow populations where the variation in size is an important experimental parameter.

Magnetic-Material Research

The magnetic behavior can depend on the particle dimensions, composition, phase, coating and dispersion state. A narrow size distribution alone does not ensure a specific magnetic response.

What Should You Request From a Monodisperse Nanoparticle Supplier?

Do not use the terms monodisperse or uniform alone. Ask what measurement method and what quantitative distribution data support the description for the specific product or grade.

Information to Request	Why It Matters
Exact product/grade	Prevents data from another material or grade being applied to the selected product.
Nominal or mean particle size	Identifies the central size value.
Measurement technique	Defines what the stated particle size represents.
Distribution data	Provides quantitative context such as standard deviation, CV, PDI or another applicable distribution metric.
Morphology	Size uniformity does not automatically establish shape uniformity.
Microscopy data	Can provide physical particle-size and morphology evidence where available.
Dispersion medium and concentration	Important for liquid products and downstream experimental planning.
Surface chemistry	Can influence colloidal behavior and compatibility with the intended experimental system.
COA	Identifies product- or lot-specific reported data when applicable.
SDS	Primary source for applicable hazard and handling information.
TDS / product specification	Defines current technical information within the scope of that document.

A more pertinent procurement question is, “What measurement technique and quantitative particle-size distribution data support the monodisperse description for the particular grade I am considering?”

Monodisperse Nanoparticle Supply for the USA & Canada

MKnano is a division of M K Impex Corp., Mississauga, Ontario, Canada. MKnano currently has monodisperse gold, silver, platinum, alumina, iron oxide, silica, and titania nanoparticle families listed, and orders are shipped from Canada.

U.S. and Canadian customers should request current information for the exact grade, including product availability, quantity, applicable documentation, pricing, and destination-specific shipping requirements.

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Which Product Documentation Should Be Reviewed Before Use?

Check the current product label and applicable SDS first, as well as the current TDS or product specification and COA where available. This means that the product-specific documentation takes precedence over the more general information for the category.

Storage, transport, handling and evaluation requirements for nanomaterials may vary depending on material, grade, particle form, coating and concentration.

Do not apply storage, handling or application guidance from one nanoparticle grade to another unless supported by appropriate documentation.

Read the Technical Information and Use Disclaimer

Monodisperse Nanoparticle Handling & Safety

Safety note: The handling requirements are determined by the specific chemistry, particle form, concentration, quantity, and process. Review the current product label and SDS and perform a workplace- or process-specific risk assessment prior to handling. Do not move handling, storage or PPE guidance from one grade to another unless it is supported by the relevant documentation.

Frequently Asked Questions About Monodisperse Nanoparticles

Does monodisperse mean every nanoparticle has exactly the same size?

No. Real nanoparticle populations have particle-to-particle variation. Monodispersity means a rather narrow distribution and has to be supported by quantitative data.

Is there one universal CV value that defines a monodisperse nanoparticle?

There is no single CV threshold that can be used to universally define monodispersity for every nanoparticle material, particle size, and analytical method. Rather than using a generic cutoff, look at the measurement basis and product-specific distribution data.

Why can TEM and DLS give different nanoparticle sizes?

TEM measures the physical size of particles in a prepared specimen, while DLS measures the hydrodynamic behavior in a liquid. As the methods measure different quantities, different numerical values can be scientifically reasonable.

Which monodisperse nanoparticle materials does MKnano list?

MKnano currently has monodisperse categories of gold, silver, platinum, alumina, iron oxide, silica, and titania. Please check the individual category or product page for current availability and specifications.

Are monodisperse nanoparticles available as powders and dispersions?

Supply form is dependent on the product. Check that the selected grade is available in powder or dispersion form. For liquid products, check the stated medium and concentration.

Can monodisperse nanoparticles be surface-functionalized?

Depending on the material and grade chosen, there are different options for surface treatment and functionalization. Don’t just assume that an option available for one product is available for another.

What characterization data should I request before ordering?

Useful data will depend on the material and can include particle size method, mean size, distribution information, morphology, microscopy, DLS data, dispersion medium, and surface chemistry. Ask for the data on the particular material being evaluated.

Does MKnano supply monodisperse nanoparticles to the USA and Canada?

MKnano is based in Mississauga, Ontario, Canada, and ships orders from Canada. Please check product availability and shipping information for your destination when requesting a quote.

How should monodisperse nanoparticles be stored?

Storage requirements vary according to the material, grade, surface chemistry, and form of delivery. Follow the current product label, SDS, TDS/specification, and applicable product-specific instructions rather than a general storage rule.

Need Help Comparing Monodisperse Nanoparticle Grades?

Send MKnano the required material, target particle size, preferred form of supply, surface requirements, quantity, documentation needs, and delivery destination. MKnano can check the product options and product-specific information for your review.

Request Current Specification & Quote

Technical notice: This content provides general technical information, not application-specific engineering or safety advice. Results depend on product grade, materials, methods, and operating conditions. Review the current SDS, TDS, and product instructions, and independently test and confirm suitability before use. [Read the full Technical Information Disclaimer.]

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Monodisperse Nanoparticles for Research & Industrial Evaluation

Available Monodisperse Nanoparticle Products

MKNano

sku: MKN-Au-Sxxx

Find a Monodisperse Nanoparticle Grade by Specification

What Are Monodisperse Nanoparticles?

How Is Nanoparticle Monodispersity Measured?

Coefficient of Variation (CV)

Why Can TEM and DLS Report Different Nanoparticle Sizes?

Monodisperse vs Polydisperse Nanoparticles: What Is the Difference?

How to Select the Right Monodisperse Nanoparticle Grade

1. Select the Material

2. Define the Particle-Size Requirement

3. Confirm the Measurement Method

4. Review the Distribution Data

5. Confirm Morphology

6. Select Powder or Dispersion

7. Review Surface Chemistry

8. Review Current Documentation

Why Can Particle-Size Uniformity Matter in Research?

Catalysis Research

Plasmonic and Optical Research

Colloidal Self-Assembly

Magnetic-Material Research

What Should You Request From a Monodisperse Nanoparticle Supplier?

Monodisperse Nanoparticle Supply for the USA & Canada

Which Product Documentation Should Be Reviewed Before Use?

Monodisperse Nanoparticle Handling & Safety

Frequently Asked Questions About Monodisperse Nanoparticles

Does monodisperse mean every nanoparticle has exactly the same size?

Is there one universal CV value that defines a monodisperse nanoparticle?

Why can TEM and DLS give different nanoparticle sizes?

Which monodisperse nanoparticle materials does MKnano list?

Are monodisperse nanoparticles available as powders and dispersions?

Can monodisperse nanoparticles be surface-functionalized?

What characterization data should I request before ordering?

Does MKnano supply monodisperse nanoparticles to the USA and Canada?

How should monodisperse nanoparticles be stored?

Need Help Comparing Monodisperse Nanoparticle Grades?