Applikationsberichte (26)

  • Metallpulver

    Metallpulver werden zur Herstellung von Präzisionsformteilen aus Metall eingesetzt. Die Größen- und Formverteilung der Metallpartikel wirkt sich auf das Verhalten des Pulvers beim Verfüllen und Sintern aus und beeinflusst dadurch das physikalische Verhalten der geformten Endprodukte.
  • Nutrazeutika

    Der Begriff "Nutrazeutika" setzt sich aus den englischen Worten "nutrition" (Ernährung) und "pharmaceutical" (pharmazeutisch) zusammen und beschreibt neuartige Lebensmittel, deren Zusatzstoffe pharmakologisch wirken sollen. Die Partikelgrößenanalyse der Produkte liefert Informationen, die entweder einen direkten Einfluss auf Punkte wie Bioverfügbarkeit, Löslichkeit und Qualitätskontrolle haben, oder eng mit diesen zusammen hängen.
  • Asphalt Emulsions

    Asphalt-aggregate roads have traditionally been made by an asphalt-coated aggregate that has been hot-mixed at a central plant. Asphalt emulsions have made the manufacturing, storage, and road construction a much simpler process. Asphalt emulsions are droplets of asphalt dispersed in water with the aid of an emulsifying agent. Particle size of the asphalt droplets is critical to stability and application performance.
  • CMP Slurry Measurement

    Chemical mechanical polishing (or planarization) is the most popular technique for removing the surface irregularities of silicon wafers. Typical CMP slurries consist of a nano-sized abrasive dispersed in acidic or basic solution. A chemical reaction softens the material during mechanical abrasion. The abrasive particles have a size distribution which directly affects critical metrics including rate of removal and wafer defects. Particle size analysis is therefore a key indicator of CMP slurry performance. The popularity and utility of several particle sizing techniques will be discussed within.
  • Chocolate

    Particle size measurement of chocolate samples is a vital factor in producing a consistent and attractive final product. Several stages of manufacturing are controlled by particle size and the particle size of cocoa powder used in chocolate affects color and flavor strength.
  • Coffee

    The flavor and strength of coffee depends on the coffee beans selected, the roasting process, the brewing method and the fineness of the ground coffee used. In commercial grinding, the process is well developed and monitored by the use of laser diffraction particle size analyzers. The speed, consistency, and ease of use have made it the most popular method for process control.
  • Drilling fluid

    The particle size distribution of drilling fluid is an important physical parameter along with other properties such as density and rheology. Although particle size is recognized as being a critical parameter, older techniques such as sieving and sedimentation have long been used in this industry. Laser diffraction is now becoming more popular due to the increased amount of information generated by this analysis technique which is quick and easy to use. This application note explains why particle size distribution is critical and how HORIBA laser diffraction analyzers can be used to measure the particle size distribution of drilling fluids. Two diffraction analyzers were used in the study, the LA-950 and the more portable LA-300. Both models offer unique advantages for these samples.
  • Electronic Ceramics

    Particle size analysis plays a crucial role in the manufacture of electronic materials for dielectric applications. These materials include single-phase powders such as barium titanate as well as formulations that contain many different oxide phases. In all cases, the particle size distribution has a great impact on their processing and performance.
  • Inks

    An ink is a liquid containing various pigments and/or dyes used for coloring a surface to produce an image, text, or design. Ink is a complex medium composed of solvents, pigments, dyes, resins, lubricants, solubilizers, surfactants, particulate matter, fluorescers, and other materials. Particle size of the pigment particles can significantly affect the color strength, surface finish, and durability of the final product. Measuring the particle size of ink pigments was typically done using dynamic light scattering (DLS). Laser diffraction can also now be used to measure these pigments due to the state of the art enhancements in the LA-950.
  • Iron Oxides

    Iron oxides are used in a wide variety of forms and have many uses. The majority are used as pigments or for their magnetic properties. Particle sizing in each of these applications is critical to final product performance.
  • LA950 - Repeatability & Reproducibility Study

    A study on LA-950 gauge-to-gauge variation was performed with 40 unique, randomly selected units of the LA-950 Particle Size Analyzer: 20 for wet measurements and 20 for dry.
  • Laser Diffraction: Dry Method Development

    Developing an appropriate method for measuring particle size distribution of powders dispersed in air using laser diffraction requires a structured approach. The basic goals for developing a dry method include: place a representative sample into the analyzer, disperse the sample using a pressure that breaks up agglomerates but not individual particles, choose appropriate system settings for measurement, and test for reproducibility.
  • Laser Diffraction Technique

    The LA-950 combines the most popular modern sizing technique with state of the art refinements to measure wet and dry samples measuring 10 nanometers to 3 millimeters. The central idea in laser diffraction is that a particle will scatter light at an angle determined by that particle’s size. Larger particles will scatter at small angles and smaller particles scatter at wide angles. A collection of particles will produce a pattern of scattered light defined by intensity and angle that can be transformed into a particle size distribution result. This technical note explains the basic underlying principles used by the LA-950 particle size analyzer.
  • Method Development for Wide Distribution Samples

    Measurement of wide size distribution materials presents a number of challenges to proper analysis. Sampling from the bulk material, sample preparation, and analysis are all affected by the tendency of this type of sample to segregate based on size during transport or storage. The different size classes may also each contain noticeably different composition. Laser diffraction particle size analyzers are a fast, accurate, and useful tool, but care must be taken in developing the analytical method to ensure that the correct results can be generated.
  • Milk Homogenization

    Milk is an emulsion that is homogenized to reduce the average particle size, which improve its consistency and extends shelf life. The homogenization process is expensive and careful control of the process can improve quality and consistency and reduce operating costs.
  • Organic Pigments

    A general definition of a pigment could mean any substance that alters the color of a material through selective color absorption. Pigments are used to color a broad range of products including ink, paint, cosmetics, fabric and food.
  • Paper Coating Chemicals

    Paper is manufactured from wood fiber slurries, fillers, sizing agents, and coatings. Sizing agents are used to provide resistance to the absorption of moisture or to eliminate ink feathering and bleed through. Selection of the specific sizing agents, fillers or coatings will depend on the final application for the paper.
  • Particle Sizing of Sediments

    Particle size analysis of a geologic area can reveal critical information about the region’s formation, history and climate. Particle characterization is an important tool for studying changes in geology and climate over time, mode of formation, and current environmental effects related to pollution transport, erosion, and sediment transport.
  • Powder Coatings

    Powder coatings are alternatives to paints that are comprised of a resin and a pigment. The powder is sprayed on the part and attracted by the electrostatic charge applied to the part. The item is then heated in an oven to cure the resin and form a solid layer. Particle size is important to provide the optimum surface finish and minimize process waste.
  • Reducing Material Costs

    New product formulations can often cost thousands of dollars per gram to manufacture. Considering that many tests destroy the sample material, formulators greatly benefit from minimizing the amount of sample required. This practice reduces material and labor costs and ideally produces the same accurate results of larger sample quantities. With the most popular particle sizing technique (laser diffraction) also being a destructive technique, there is motivation for instrument manufacturers to provide the best size results with the least sample and costs.
  • Repeatability Study on the LA-950

    Study on LA-950 gage-to-gage variation was performed with 4 different samples on 2 random selected units of LA-950 (S/N EVD and HOO).
  • Solid Oxide Fuel Cell Materials

    Solid oxide fuel cells (SOFC’s) offer the potential to greatly reduce man’s dependence on coal and oil for the production of electricity. They are clean, quiet and efficient. At the heart of these devices lies a complex combination of polycrystalline ceramic materials, each having to meet a particular set of structural and electrochemical requirements.
  • Synthetic Diamond Abrasives

    Diamond is one of the hardest materials known to man. As such, it makes an ideal abrasive for applications such as grinding wheels, hones and dressing tools. The finer grades (less than 325 mesh/44 microns) are called diamond micron powders and are used in a powder or slurry form for a variety of polishing and lapping applications.
  • Utilizing USP <429>

    Pharmaceutical companies are beginning to refer to the USP <429> test as a guideline when using laser diffraction for particle size analysis. This document provides useful background material and offers specific advice on testing reproducibility and verifying accuracy using polydisperse standards.
  • Wet Method Development for Laser Sizers

    Developing an appropriate testing method for measuring particle size distribution in liquids using laser diffraction requires a structured approach. A number of parameters of the test method must be evaluated including sampling, solvent, refractive index, dispersion, system settings, and concentration. These parameters may have a significant effect on the reported results, so each must be carefully evaluated.
  • Zironicum Oxide

    Zirconium oxide is a common metal oxide ceramic with a wide range of uses due to its thermal stability, strength, chemical resistance, and optical properties. In most applications, particle size is an important parameter in the final product performance.

Fachberichte (6)

  • Whitepaper Methodenvergleich Partikelanalyse

    Unterschiedliche Messverfahren liefern unterschiedliche Ergebnisse – aber was ist die Wahrheit? Dynamische Digitale Bildanalyse (DIA), statische Laserlichtstreuung (SLS, auch Laserbeugung) und Siebanalyse sind die häufi gsten Methoden zur Partikelgrößenmessung. In diesem White Paper lernen Sie die Vor- und Nachteile der einzelnen Methoden kennen, ihre Vergleichbarkeit untereinander sowie deren Anwendung an konkreten Beispielen.
  • Partikelanalytik im Nanometerbereich

    In vielen Industrien wird die Laserbeugung zur Partikelcharakterisierung im Rahmen der Qualitätskontrolle eingesetzt. Man unterscheidet dabei im Wesentlichen zwischen zwei Verfahren, der dynamischen Laserstreulichtanalyse (DLS) und der statischen Laserstreulichtanalyse (SLS). Beide Methoden erlauben eine schnelle und einfache Charakterisierung von Dispersionen. In dem folgenden Artikel werden beide Methoden anhand ihrer wesentlichen Charakteristika gegenübergestellt. Bei der dynamischen Lichtstreuung existieren verschiedene Mess- und Auswertemöglichkeiten. Dieser Beitrag beschäftigt sich ausschließlich mit der sogenannten Photonenkorrelationsspektroskopie (PCS), der am weitesten verbreiteten Methode der dynamischen Streulichtmessung. Die hier vorgestellten Analysen wurden mit dem HORIBA LA-950 (SLS, Abb. 1) und einem HORIBA SZ-100 (DLS, Abb. 1) durchgeführt. Beide Analysemethoden sind in ISO-Standards beschrieben: ISO 13320 (SLS) und ISO 13321 (DLS).
  • Flexible Möglichkeiten

    In der pharmazeutischen Industrie sind Partikelgrößenverteilungen als Prozess- und Qualitätsparameter von großer Bedeutung.
    Die Partikelgröße kann wichtige Eigenschaften von Endprodukten wie z. B. die Dichte, die Rieselfähigkeit, die Pressbarkeit, die chemische Reaktivität, die Löslichkeit oder das Freisetzungsverhalten verändern. Die Partikelgrößenverteilungen von Wirk- und Hilfsstoffen werden dabei gezielt durch Zerkleinerungs- und Granulierprozesse beeinflusst, um entsprechende Eigenschaften bei der Verarbeitung oder im Endprodukt zu erzeugen. Dabei auftretende Partikelgrößen reichen vom Nano- bis in den Millimeterbereich.
  • Überprüfung von Laserstreulichtanalysatoren

    Die Funktion eines Laserbeugunssystems sollte regelmäßig überprüft werden. Die Häufigkeit dieser Tests ist abhängig von der Nutzung und der Risikobeurteilung, aber in den meisten Branchen wird davon ausgegangen, dass eine Überprüfung mindestens einmal jährlich erfolgen sollte. Für viele Labore stellt sich die Frage: Welche(r) Standard(s) sollen für die Überprüfung verwendet werden? Dieser Artikel enthält eine Zusammenfassung der aktuell gültigen Empfehlungen von HORIBA Instruments zur Prüfung von Laserstreulichtanalysatoren der LA-Serie.
  • Laserbeugung neu definiert

    Neuer Partikelanalysator setzt Maßstäbe in der Partikelgrößenbestimmung
  • Nanopartikel in Sonnencremes

    Viele kosmetische Produkte, wie zum Beispiel Gesichtspuder, Sonnencremes
    oder Lippenstifte, beinhalten Partikel oder Emulsionen. Da bestimmte Eigenschaften des Endprodukts von der Größe der verarbeiteten Teilchen abhängig sind, spielt die Partikelanalytik eine entscheidende Rolle bei der Qualitätskontrolle und der Entwicklung neuer Kosmetika....

Technische Änderungen und Irrtümer vorbehalten