Hielscher Ultrasonics
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Ultrasonic Dispersion of Nanomaterials (Nanoparticles)

Nanomaterials have become an integral component of products as diverse as high-performance materials, sunscreens, performance coatings, or plastic composites. Ultrasonic cavitation is used to disperse nano-size particles into liquids, such as water, oil, solvents or resins.

Ultrasonic Dispersion of Nanoparticles

UP200S ultrasonic homogenizer used for dispersion of nanoparticles

The application of ultrasonic dispersion of nanoparticles has manifold effects. The most obvious is the dispersing of materials in liquids in order to break particle agglomerates. Another process is the application of ultrasound during particle synthesis or precipitation. Generally, this leads to smaller particles and increased size uniformity. ultratovushli kavitatsiya improves the material transfer at particle surfaces, too. This effect can be used to improve surface funksionallashtirish of materials having a high specific surface area.

Dispersing and Size Reduction of Nanomaterials

Degussa titanium dioxide powder before and after ultrasonic cavitational processing.Nanomaterials, e.g. metal oxides, nanoclays or Uglerod nanotubalari tend to be agglomerated when mixed into a liquid. Effective means of deagglomerating and Tarqatish are needed to overcome the bonding forces after wettening the powder. The ultrasonic breakup of the agglomerate structures in aqueous and non-aqueous suspensions allows utilizing the full potential of nanosize materials. Investigations at various dispersions of nanoparticulate agglomerates with a variable solid content have demonstrated the considerable advantage of ultrasound when compared with other technologies, such as rotor stator mixers (e.g. ultra turrax), piston homogenizers, or wet milling methods, e.g. bead mills or colloid mills. Hielscher ultrasonic systems can be run at fairly high solids concentrations. For example for Silika the breakage rate was found to be independent of the solid concentration up to 50% by weight. Ultrasound can be applied for the dispersing of high concentration master-batches – processing low and high viscosity liquids. This makes ultrasound good processing solution for paints and coatings, based on different media, such as water, resin or oil.

Ultrasonic dispersion is a well established method to prepare uniformly distributed nano-particles

ultratovushli gomogenizator UP400St for nano-dispersions

Ma'lumot so'rovi







Click here to read more about the ultrasonic dispersing of carbon nanotubes.

ultratovushli kavitatsiya

Ultrasonic Cavitation in Water caused by intense ultrasonicationDispersion and deagglomeration by ultrasonication are a result of ultrasonic cavitation. When exposing liquids to ultrasound the sound waves that propagate into the liquid result in alternating high-pressure and low-pressure cycles. This applies mechanical stress on the attracting forces between the individual particles. ultratovushli kavitatsiya in liquids causes high speed liquid jets of up to 1000km/hr (approx. 600mph). Such jets press liquid at high pressure between the particles and separate them from each other. Smaller particles are accelerated with the liquid jets and collide at high speeds. This makes ultrasound an effective means for the dispersing but also for the frezalash of micron-size and sub micron-size particles.

Ultrasonically Assisted Particle Synthesis / Precipitation

Optimized sono-chemical reactor (Banert et al., 2006)Nanoparticles can be generated bottom-up by synthesis or precipitation. Sonochemistry is one of the earliest techniques used to prepare nanosize compounds. Suslick in his original work, sonicated Fe(CO)5 either as a neat liquid or in a deaclin solution and obtained 10-20nm size amorphous iron nanoparticles. Generally, a supersaturated mixture starts forming solid particles out of a highly concentrated material. Ultrasonication improves the mixing of the pre-cursors and increases the mass-transfer at the particle surface. This leads to smaller particle size and higher uniformity.

Ultrasonic dispersers are used to detangle single-walled nanotubes (SWNTs) efficiently.

UIP2000hdT, a 2kW powerful ultrasonicator to disperse SWCNTs.

Ma'lumot so'rovi







Click here to read more about ultrasonically assisted precipitation of nanomaterials.

Surface Functionalization Using Ultrasound

Many nanomaterials, like metal oxides, inkjet ink and toner pigments, or fillers for performance qoplamalar, require surface functionalization. In order to functionalize the complete surface of each individual particle, a good dispersion method is required. When dispersed, particles are typically surrounded by a boundary layer of molecules attracted to the particle surface. In order for new functional groups to get to the particle surface, this boundary layer needs to be broken up or removed. The liquid jets resulting from ultrasonic cavitation can reach speeds of up to 1000km/hr. This stress helps to overcome the attracting forces and carries the functional molecules to the particle surface. In Sonokimyo, this effect is used to improve the performance of dispersed catalysts.

Ultrasonication before Particle Size Measurement

Pumping, Stirring and Sonication with the All-in-One ultrasonic device SonoStep (Click to enlarge!)

Ultrasonication of samples improves the accuracy of your particle size or morphology measurement. The new SonoStep combines ultrasound, stirring and pumping of samples in a compact design. It is easy to operate and can be used to deliver sonicated samples to analytic devices, such as particle size analyzers. The intense sonication helps to disperse agglomerated particles leading to more consistent results.Click here to read more!

Ultrasonic Processing for Lab and Production Scale

Ultrasonic processors and flow cells for deagglomeration and dispersion are available for Laboratoriya va ishlab chiqarish level. The industrial systems can easily be retrofitted to work inline. For the research and process development we recommend using the UIP1000hd (1,000 watts).

Hielscher offers a broad range of ultrasonic devices and accessories for the efficient dispersing of nanomaterials, e.g. in paints, inks and coatings.

Bench top equipment is available for rental at good conditions to run process trials. Results of such trials can be scaled linear to production level – reducing the risk and costs involved in the process development. We will be glad to assist you online, on the phone or personally. Please find our addresses here, or use the form below.

Quyidagi jadvalda ultrasonikatorlarimizning taxminiy qayta ishlash quvvati ko'rsatilgan:

To'plam hajmi Oqim darajasi Tavsiya etilgan qurilmalar
1 dan 500 ml gacha 10 dan 200 ml / min UP100H
10 dan 2000 ml gacha 20 dan 400 ml / min UP200Ht, UP400St
0.1 dan 20 L gacha 0.2 dan 4L/min gacha UIP2000hdT
10 dan 100 l gacha 2 dan 10 l / min UIP4000hdT
na 10 dan 100 l / min UIP16000
na kattaroq ning klasteri UIP16000

Biz bilan bog'lanish! / Bizdan so'rang!

Qo'shimcha ma'lumot olish uchun so'rang

Ultrasonik protsessorlar, ilovalar va narx haqida qo'shimcha ma'lumot so'rash uchun quyidagi shakldan foydalaning. Biz sizning jarayoningizni siz bilan muhokama qilishdan va sizning talablaringizga javob beradigan ultratovush tizimini taklif qilishdan mamnun bo'lamiz!









Iltimos, bizning Maxfiylik siyosati.






Nanomateriallar – Background Information

Nanomaterials are materials of less than 100nm in size. They are quickly progressing into the formulations of paints, inks and coatings. Nanomaterials fall into three broad categories: metal oxides, nanoclays, and Uglerod nanotubalari. Metal-oxide nanoparticles, include nanoscale zinc oxide, titanium oxide, iron oxide, cerium oxide and zirconium oxide, as well as mixed-metal compounds such as indium-tin oxide and zirconium and titanium, as well as mixed-metal compounds such as indium-tin oxide. This small matter has an impact on many disciplines, such as physics, Kimyo and biology. In paint and coatings nanomaterials fulfill decorative needs (e.g. color and gloss), functional purposes (e.g. conductivity, microbial inactivation) and improve protection (e.g. scratch resistance, UV stability) of paints and coatings. In particular nano-size metal-oxides, such as TiO2 and ZnO or Alumina, Ceria and Silika and nano-size pigments find application in new paint and coating formulations.

When matter is reduced in size it changes its characteristics, such as color and interaction with other matter such as chemical reactivity. The change in the characteristics is caused by the change of the electronic properties. By the zarrachalar hajmini kamaytirish, the surface area of the material is increased. Due to this, a higher percentage of the atoms can interact with other matter, e.g. with the matrix of resins.

Surface activity is a key aspect of nanomaterials. Agglomeration and aggregation blocks surface area from contact with other matter. Only well dispersed or single-dispersed particles allow to utilize the full beneficial potential of the matter. In result good dispersing reduces the quantity of nanomaterials needed to achieve the same effects. As most nanomaterials are still fairly expensive, this aspect is of high importance for the commercialization of product formulations containing nanomaterials. Today, many nanomaterials are produced in a dry process. As a result, the particles need to be mixed into liquid formulations. This is where most nanoparticles form agglomerates during the wetting. Especially Uglerod nanotubalari are very cohesive making it difficult to disperse them into liquids, such as water, ethanol, oil, polymer or epoxy resin. Conventional processing devices, e.g. high-shear or rotor-stator mixers, high-pressure homogenizers or colloid and disk mills fall short in separating the nanoparticles into discrete particles. In particular for small matter from several nanometers to couple of microns, ultrasonic cavitation is very effective in breaking agglomerates, aggregates and even primaries. When ultrasound is being used for the frezalash of high concentration batches, the liquid jets streams resulting from ultrasonic cavitation, make the particles collide with each other at velocities of up to 1000km/h. This breaks van der Waals forces in agglomerates and even primary particles.

Ultrasonik yuqori kesish gomogenizatorlari laboratoriya, dastgoh, uchuvchi va sanoat ishlov berishda qo'llaniladi.

Hielscher Ultrasonics laboratoriya, uchuvchi va sanoat miqyosida ilovalar, dispersiya, emulsifikatsiya va ekstraktsiyani aralashtirish uchun yuqori samarali ultratovushli homogenizatorlarni ishlab chiqaradi.

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