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Requirements to characterise manufactured nanomaterials (MNM) under relevant biological and environmental exposure conditions have been well established. This is key to understanding particle fate and behaviour and ultimately in determining the available MNM dose in toxicity assessments. Variations in media properties can significantly alter particle behaviour. This drives a need for technology capable of characterising particles in complex matrices. NTA presents a tool capable of meeting these requirements and is demonstrated with a series of experiments performend with a range of particle types in relevant biological and environmental media providing temporal data of suspension properties..

Produits:
NanoSight NS500
Date:
April 4 2017
Langue:
English
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Poly(lactic acid) is a biodegradable polymer derived from natural resources (corn starch), that has received significant attention in recent years. It is one of the most prevalent biodegradable polymers in the market place due to availability, low cost of production, and when derived from natural sustainable sources it is a truly renewable polymer. PLA is often used as a copolymer with glycolic acid to form PLGA and is routinely used with varying compositions of lactic and glycolic acids. Being a versatile polymer, it is used in a wide variety of applications from additive manufacture (3D printing) to disposable cutlery, biodegradable sutures, drug delivery, or as biodegradable packaging.. It is widely recognized that the bulk properties of polymers are strongly dependent on their molecular properties. Most commonly, the strongest determinant of a polymer’s strength is assumed to be its molecular weight. However, in copolymers such as PLGA, it is also likely that copolymer composition will also strongly affect those properties.. This application note uses two Malvern technologies to explore the relationship between the molecular and bulk properties of PLA and PLGA. Multi-detector GPC is used to measure molecular weight and intrinsic viscosity (which is dependent on copolymer composition), while rotational rheology is used to study melt-viscosity. The two results are then compared to study which molecular properties best correlate with melt-viscosity. .

Produits:
Kinexus ultra+
Date:
April 27 2017
Langue:
English
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This data sheet demonstrates that the M1 and M3 polymorphs in clinker can be quantified individually using the Rietveld method. The repeatability of the method is such that it allows accurate process control of cement production.. The main component in industrial clinkers for the cement production is alite with the ideal composition Ca3SiO5, also written as C3S in the short cement notation. This compound can occur in crystallographic polymorphs. Their formation depends mainly on the burning conditions (temperature, burning time, cooling rates) and minor or trace elements in the crystal structure, introduced by the raw material and fuels. Most relevant in clinkers are two monoclinic polymorphs of alite, the M1 and M3 forms. In recent years the quantification of these two polymorphs has become of more interest because of publications claiming differences in the reactivity of synthetic M1 and M3 alite. .

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The Morphologi® automated image analysis system is ideally suited to the efficient characterization of particle size and shape for metal powders used in additive manufacturing and metal injection molding. The quality of the part produced is determined during the sintering stage of the manufacturing process. Even sintering relies on consistent particle packing, which is determined by the size distribution and particle shape. In this application note, the Morphologi was used to determine the shape characteristics of metal powders produced by different methods, but of the same particle size. .

Produits:
Morphologi 4
Date:
December 7 2016
Langue:
English
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