CAD Instruments - ZetaCompact , zêtamètre par micro-électrophorèse
CAD Instruments – ZetaCompact , zêtamètre par micro-électrophorèse
  Le ZetaCompact est un zêtamètre basé sur la technique de micro-électrophorèse, c'est-à-dire, un couplage entre observation directe (microscopie) et déplacement de particules en suspension sous champ électrique (électrophorèse). L'illumination de la zone de mesure s'effectue à l'aide d'une feuille laser (ou Single Plane Illumination Microscopy) créée par une combinaison de lentilles associées à un laser. Cette technique permet l'observation des particules dans un plan vertical. [media-downloader media_id="4127" texts="Pour plus de détails, cliquez ici"]
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CAD Instruments - ZetaPhoremeter IV
CAD Instruments – ZetaPhoremeter IV

Zêtamètrie laser par analyse d’images

Le ZetaPhoremeter IV est un zêtamètre basé sur la technique de micro-électrophorèse, c'est-à-dire, un couplage entre observation directe (microscopie) et déplacement de particules en suspension sous champ électrique (électrophorèse). L'illumination de la zone de mesure s'effectue à l'aide d'une feuille laser (ou Single Plane Illumination Microscopy) créée par une combinaison de lentilles associées à un laser. Cette technique permet l'observation des particules dans un plan horizontal.
La determination du Potentiel Zêta n'est pertinente que si la mobilité électrophorétique est mesurée dans le plan stationnaire dont la position est connue et contrôlée précisément. Le suivi du déplacement des particules grâce à une caméra numérique est enregistré sous forme de séquence d'images. ZetaCompact Principle La distribution des mobilités électrophorétiques est alors mesurée à l'aide d'un algorithme récemment implémenté pour détecter et suivre jusqu'à 5 000 trajectoires/séquence. Basé sur le principe de la corrélation d'images, cet algorithme offre une meilleure détermination du Potentiel Zêta, dans des milieux dilués ou semi-dilués. La seule différence avec le zêtamètre ZetaCompact réside dans le mode d'observation. Le ZetaPhoremeter IV comprend un microscope droit Nikon pour permettre l'éclairage et l'acquisition des séquences d'images. Il peut également être adapté à d'autres modèles de microscopes.

Applications

Les nombreuses applications d'utilisation du ZetaPhoremeter concernent principalement les domaines suivants :
  • Suspensions
  • Emulsions
  • Bactéries
  • Protéines
  • Nanoparticules
[media-downloader media_id="4143" texts="Pour plus de détails, cliquez ici"]
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Microtrac Nanotrac Flex
Microtrac Nanotrac Flex
The Nanotrac Flex in-situ particle size analyser delivers fast and accurate analysis capability. Powered by Microtrac’s enhanced Dynamic Light Scattering technology, the Nanotrac Flex is ideal for measuring particles across wide concentration ranges using minimal sample volume. Named appropriately, the external probe provides users with the flexibility to measure sub nanometer to several micron particle suspensions in-situ (in process) or on a lab bench. What sets the Nanotrac Flex apart from other DLS systems is the unique probe technology, which turns any vessel into a sample cell. The probe also utilises an enhanced optical signal, which yields fast, accurate, and sensitive particle size measurements of materials ranging from ppm to near finished product. The Nanotrac Flex is designed for in-situ measurements of colloidal systems. It is based on 180° heterodyne dynamic light scattering and can measure up to 40% w/v material concentration. With this setup, a part of the laser beam is added to the scattered light. This works like an optical enhancement of the scattered light. Particle sizes range from 0.8 to 6,500 nm. In addition to particle size one can also measure the molecular weight according to Debye. The needed dn/dc value needed will be measured automatically and doesn’t need to be added from a table. A mixture of 100 and 250 nm Polystyrol Latex will be detected as separate peaks. Despite its multiple capabilities, it doesn’t lack in accuracy and safety. The extensive analysis data highly exceeds the requirements of ISO 22412 and meets safety requirements according to CFR21 Part 11. The fibre measurement method is used in the Nanotrac Flex to use the fiber end as a dip-in probe. Advantages of this method are that no cuvettes are needed, the direct measurement in the product and the inline option. The results are ready after a measurement time of 10 to 100 seconds. The parameters like refractive index and absorption of the particles, as well as the viscosity of the surrounding liquid, are needed for the accuracy, and are available in a database. With the proprietary Mie calculation, the user is able to measure transparent or light absorbing samples, as well as spherical and irregular particles. The probe, which is the catalyst for Reference Beating, Microtrac’s enhancement to traditional DLS, increases the optical signal back to the detector anywhere from 100 to 1,000,000 times more than systems who use “self-beating.” The enhanced signal produces superior analysis results when measuring single modes or multi-modes across the widest concentration range. Applications for the Nanotrac Flex:
  • Pharmaceuticals/Biotechnology
  • Chemicals
  • Food/Beverage
  • Plastics/Polymers
  • Coatings/Coverings
  • Inks
  • Adhesives
  • Academic Research
Nanotrac Flex In-situ Particle Size Analyser Details:
  • Turn any vessel into a sample cell – the external probe allows you to dip and measure
  • Small sample volume required
  • Amplified optical signal for unparalleled accuracy and sensitivity, compliments of Reference Beating – only from Microtrac
  • Measures particles ranging in size from 0.8 to 6,500 nanometres
  • No advanced, or “A priori” knowledge of the particle size distribution is required
  • Ability to measure size and concentration simultaneously.
  • Molecular weight determination
  • Numerous probe lengths available
  • Universal solvent compatibility
[media-downloader media_id="4465" texts="Click here for details"]
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Partical Metrix – ZetaView
First principal electrophoresis zeta potential and Brownian diffusion size With ZetaView® individual particle tracking, classical micro-electrophoresis and Brownian motion have a modern analysis tool. Auto-alignment and auto-focussing make the “Seeing is Believing” principle alive. Highly resolved zeta potential- and size- histograms as well as profiles are derived from thousands of particles in a routine way. In addition, low particle concentrations can be determined. A separate model with a short wavelength laser is available for discrimination of fluorescent particles. The visualisation in general contributes to analysis certainty and to new discoveries. [media-downloader media_id="1167" texts="Click here for details"]
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Particle Metrix Stabino zetameter
Particle Metrix Stabino zetameter
Rapid charge titrations for stability analysis of colloids and dispersions enhance the efficiency of formulation and particle interface analysis. The Particle Interface Potential of particles is measured as streaming / zeta potential and represents the degree of electrostatic repulsion between particles. It reacts to pH, conductivity and polyelectrolyte surrounding, respectively. A charge titration with the Stabino® specifies which parameters require special attention. The isoelectric point can be titrated within short time, gathering information on charge density and stable zones, whilst pH, conductivity and temperature are monitored simultaneously. Particle Charge Mapping The intuitive tablet PC controlled automatic titration of the Stabino® opens the way to particle charge finger-printing of colloids and dispersions. The isoelectric point is reached quickly, gathering information on charge density and stable zones, whilst pH, conductivity and temperature are measured simultaneously. [media-downloader media_id="1168" texts="Click here for details"]  
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