Controllable porous polymer particles generated by electrospraying

Wu, Yusong; Clark, Robert L.

doi:10.1016/j.jcis.2007.02.023

Cited by 148 publications

(97 citation statements)

References 33 publications

(43 reference statements)

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“…Residual solvent interaction with non-solvent substrates gives rise to a multi-compartment system (e.g., polymer, solvent vehicle and non-solvent substrate). Furthermore, the non-solvent (e.g., collecting media substrate) has the potential to generate voids, as nano-droplets become embedded onto the structures and are in greater quantities compared to the residual solvent [12].…”

Section: Resultsmentioning

confidence: 99%

“…Previous experiments by Wu et al evidenced the validity of the ES technique for porous MP synthesis. Here, PCL-chloroform droplets (prepared by using ES) were collected in water, which yielded nano-sized micropore and micro-sized macropore concurrence on the MP surface [12]. More recently, porous polymethylmethacrylate (PMMA)-based microstructures were obtained using several non-solvents and solvent (dichloromethane (DCM)) mixtures (suspensions) via co-ES.…”

Section: Introductionmentioning

confidence: 99%

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Tuning Microparticle Porosity during Single Needle Electrospraying Synthesis via a Non-Solvent-Based Physicochemical Approach

et al. 2015

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Porous materials, especially microparticles (MP), are utilized in almost every field of engineering and science, ranging from healthcare materials (drug delivery to tissue engineering) to environmental engineering (biosensing to catalysis). Here, we utilize the single needle electrospraying technique (as opposed to complex systems currently in development) to prepare a variety of poly(ε-caprolactone) (PCL) MPs with diverse surface morphologies (variation in pore size from 220 nm to 1.35 µm) and architectural features (e.g., ellipsoidal, surface lamellar, Janus lotus seedpods and spherical). This is achieved by using an unconventional approach (exploiting physicochemical properties of a series of non-solvents as the collection media) via a single step. Sub-micron pores presented on MPs were visualized by electron microscopy (demonstrating a mean MP size range of 7-20 µm). The present approach enables modulation in morphology and size requirements for specific applications (e.g., pulmonary delivery, biological scaffolds, multi-stage drug delivery and biomaterial topography enhancement). Differences in static water contact angles were observed between smooth and porous MP-coated surfaces. This reflects the hydrophilic/hydrophobic properties of these materials.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tuning Microparticle Porosity during Single Needle Electrospraying Synthesis via a Non-Solvent-Based Physicochemical Approach

et al. 2015

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“…These findings demonstrate that ES pitch powder solution created a new form of carbon micro particles. separated from each other, which indicate a low surface tension force in THF acting on the pitch particles during drying [16,17].…”

Section: Discussionmentioning

confidence: 99%

Micro-sized carbon with dimple patterns prepared using an electro-spray method

Park¹,

Lee²

2015

Carbon letters

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Carbon micro particles with dimple patterns were produced by electro-spraying a solution of pitch in tetrahydrofuran. Particle formation depended on separation in an electrical field and volatilization of the solvent. More than 80% of the obtained carbon exhibited an average particle size of less than 50 μm. X-ray diffraction analysis suggests that the carbon with dimple patterns has increased crystallinity after heat treatment.

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“…As a powerful and convenient technique to observe particle morphology, ultra-high resolution SEM was used to visually and systematically characterize the structures of product particles [13]. The effects of processing conditions upon the structure formation were studied, and the possible mechanisms for pore generation were proposed based on our systematic observation.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Porous Nanostructures Controlled by Electrospray

Nah¹,

Kim²

2015

Korean Chemical Engineering Research

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− Various solid structures were prepared by electrospray technique. In this process, liquid flows out from a capillary nozzle under a high electrical potential and is subjected to an electric field, which causes elongation of the meniscus to form a jet. In our study, by controlling the amount of polyvinyl pyrrolydone in precursor solution, the jet either disrupted into droplets for the formation of spherical particles or was stretched in the electric field for the formation of fibers. During the electrospray process, the ethanol solvent was evaporated and induced the solidification of precursors, forming solid particles. The evaporation of ethanol solvent also enhanced the mass transport of solutes from the inner core to the solid shell, which facilitated fabrication of porous and hollow structure. The network structures were also prepared by heating the collector.

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Controllable porous polymer particles generated by electrospraying

Cited by 148 publications

References 33 publications

Tuning Microparticle Porosity during Single Needle Electrospraying Synthesis via a Non-Solvent-Based Physicochemical Approach

Tuning Microparticle Porosity during Single Needle Electrospraying Synthesis via a Non-Solvent-Based Physicochemical Approach

Micro-sized carbon with dimple patterns prepared using an electro-spray method

Preparation of Porous Nanostructures Controlled by Electrospray

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