Effect of solid circulation rate on coating efficiency and agglomeration in circulating fluidized bed type coater

Kage, Hiroyuki; Abe, R.; Hattanda, Ryusuke; Zhou, Tao; Ogura, Hironao; Matsuno, Yasunari

doi:10.1016/s0032-5910(02)00267-x

Cited by 22 publications

(7 citation statements)

References 5 publications

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“…2d). 59, 60, 199, 291 Conformal coatings were obtained without agglomeration, a significant advantage over liquid‐based methods which tend to bind together particles with diameters below 100 µm in diameter 504. In order to improve compatibility between the carbon nanotubes and polymeric matrices, multiwall CNTs were coated with PMMA via pulsed PECVD, which were then dispersed in a PMMA matrix via melt processing methods 505.…”

Section: Example Applicationsmentioning

confidence: 99%

Chemical Vapor Deposition of Conformal, Functional, and Responsive Polymer Films

et al. 2010

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Chemical vapor deposition (CVD) polymerization utilizes the delivery of vapor-phase monomers to form chemically well-defined polymeric films directly on the surface of a substrate. CVD polymers are desirable as conformal surface modification layers exhibiting strong retention of organic functional groups, and, in some cases, are responsive to external stimuli. Traditional wet-chemical chain- and step-growth mechanisms guide the development of new heterogeneous CVD polymerization techniques. Commonality with inorganic CVD methods facilitates the fabrication of hybrid devices. CVD polymers bridge microfabrication technology with chemical, biological, and nanoparticle systems and assembly. Robust interfaces can be achieved through covalent grafting enabling high-resolution (60 nm) patterning, even on flexible substrates. Utilizing only low-energy input to drive selective chemistry, modest vacuum, and room-temperature substrates, CVD polymerization is compatible with thermally sensitive substrates, such as paper, textiles, and plastics. CVD methods are particularly valuable for insoluble and infusible films, including fluoropolymers, electrically conductive polymers, and controllably crosslinked networks and for the potential to reduce environmental, health, and safety impacts associated with solvents. Quantitative models aid the development of large-area and roll-to-roll CVD polymer reactors. Relevant background, fundamental principles, and selected applications are reviewed.

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Section: Example Applicationsmentioning

confidence: 99%

Chemical Vapor Deposition of Conformal, Functional, and Responsive Polymer Films

et al. 2010

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“…This size limitation is due to particle agglomeration, especially with finer particles that occurs when liquid bridges between the particles cause them to bind together during drying. [11,12] In contrast, iCVD has been shown to enable polymer encapsulation of individual particles down to the nanoscale. [9] As such, this work reports the use of iCVD in synthesizing methacrylic acid copolymers for the purpose of encapsulating fine drug microcrystals below 100 mm in size to confer enteric release properties.…”

Section: Introductionmentioning

confidence: 99%

All‐Dry Synthesis and Coating of Methacrylic Acid Copolymers for Controlled Release

Lau

Gleason

2007

Macromolecular Bioscience

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Initiated chemical vapor deposition (iCVD) is presented as an all-dry synthesis and coating method for applying methacrylic acid copolymers as pH-responsive controlled release layers. iCVD combines the strengths of liquid-phase chemical synthesis with a precision solvent-free chemical vapor deposition environment. Copolymers of methacrylic acid and ethyl acrylate were confirmed by a systematic shift in the carbonyl bond stretching mode with a shift in the comonomer ratio within the copolymer and by the ability to apply the Fineman-Ross copolymerization equation to describe copolymerization kinetics. Copolymers of methacrylic acid and ethylene dimethacrylate showed pH-dependent swelling behavior that was applied to the enteric release of fluorescein and ibuprofen.

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“…This may be a significant advantage as there are indications that liquid-based methods that rely on drying out of a wet polymer solution often suffer from particle agglomeration as a result of strong liquid surface-tension forces and increasing polymer viscosity during drying, which creates liquid bridges that bind the particles together especially when particles fall below 100 lm in size. [26,27] Second, to promote surface adsorption of reactive species, iCVD relies on a cooled particle bed that is at a temperature (usually room temperature) much lower than the initiator activation temperature. This conveniently enables particle materials, for example, pharmaceutical drugs and polymer systems that may degrade at elevated temperatures to be treated via iCVD without compromising their material integrity.…”

mentioning

confidence: 99%

Particle Surface Design using an All‐Dry Encapsulation Method

Lau

Gleason

2006

Advanced Materials

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Initiated chemical vapor deposition enables an all‐dry encapsulation of fine particles down to the nanoscale by functional polymers. Initiator vapor is first thermally activated to form primary radicals, which, together with the monomer vapor, are adsorbed onto the particle surface where free‐radical polymerization creates a stoichiometric polymer coating (see figure). This polymer coating can subsequently be immobilized with other desired functional molecules.

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Effect of solid circulation rate on coating efficiency and agglomeration in circulating fluidized bed type coater

Cited by 22 publications

References 5 publications

Chemical Vapor Deposition of Conformal, Functional, and Responsive Polymer Films

Chemical Vapor Deposition of Conformal, Functional, and Responsive Polymer Films

All‐Dry Synthesis and Coating of Methacrylic Acid Copolymers for Controlled Release

Particle Surface Design using an All‐Dry Encapsulation Method

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