Phase ripening in particulate binary polymer blends

Cheng, Mary Hongying; Nauman, E. Bruce

doi:10.1002/polb.10714

Cited by 11 publications

(5 citation statements)

References 34 publications

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“…4) that has been documented as aggregation in previous studies 13,32 . So far, many phenomenon namely, Brownian coalescence wherein collision occurs between particulates due to Brownian motion, Ostwald ripening where the particulates turns in to large ones through molecular diffusion across the intervening continuous phase, hydrodynamic coarsening via particulates interfacial velocity, coalescence-induced coalescence and diffusion-induced coalescence have been proposed for particulate coarsening effect 33 . Herein, we observed the protein-induced coalescence of NPs, where the NPs possibly dissolves during strong surface pressure produced by corona while approaching to larger coronated-NPs, diffuses across the neck like protein-bridge and coalesces with the other NPs.…”

Section: Resultsmentioning

confidence: 99%

Assessment on interactive prospectives of nanoplastics with plasma proteins and the toxicological impacts of virgin, coronated and environmentally released-nanoplastics

Gopinath

Saranya

Shanmugam

et al. 2019

Sci Rep

217

115

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Recently, the concerns about micro- and nano-plastics (NPs) toxicity have been increasing constantly, however the investigations are quiet meager. The present study provides evidences on the toxicological prospectives of virgin-, coronated- and isolated-NPs on human blood cells and Allium cepa root tip, respectively. Several plasma proteins displayed strong affinity towards NPs and produced multi-layered corona of 13 nm to 600 nm size. The coronated-NPs often attracted each other via non-specific protein-protein attraction which subsequently induced protein-induced coalescence in NPs. In the protein point of view, the interaction caused conformational changes and denaturation of protein thereby turned it as bio-incompatible. The coronated-NPs with increased protein confirmation changes caused higher genotoxic and cytotoxic effect in human blood cells than the virgin-NPs. On the other hand, virgin-NPs and the NPs isolated from facial scrubs hindered the root growth and caused chromosome aberration (ring formation, C-mitotic and chromosomal breaks, etc.) in root of Allium cepa . At the outset, the present study highlights the urgent need of scrutinization and regulation of NPs use in medical applications and pre-requisition of additional studies for assessing the bio-accumulation and bio-magnification of NPs.

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Section: Resultsmentioning

confidence: 99%

Assessment on interactive prospectives of nanoplastics with plasma proteins and the toxicological impacts of virgin, coronated and environmentally released-nanoplastics

Gopinath

Saranya

Shanmugam

et al. 2019

Sci Rep

217

115

View full text Add to dashboard Cite

show abstract

“…The AL-rich domains have a diameter around ∼5 μm. Normally, when phase separation occurs in a composite system and the sea-island structure is formed, a coarsening of the island phase would happen due to Brownian motion or Ostwald ripening . To our surprise, regardless the increase of the storage temperature from 30 to 50 °C and storage time from 0 to 15 days, the diameters of AL-rich domains are very stable without a noticeable increment.…”

Section: Resultsmentioning

confidence: 79%

Incorporation of Alkali Lignin in Polyacrylonitrile: Phase Separation, Coagulation, and Cyclization Kinetics

Zhou

Hao

et al. 2019

ACS Omega

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In this study, we systematically investigated the phase separation behaviors of polyacrylonitrile (PAN)/alkali lignin (AL)/dimethyl sulfoxide (DMSO) systems and found that the addition of AL causes phase separation and the systems form sea (PAN)/island (AL) types of structures. Interestingly, the AL-rich domains are very stable even after a long time of storage up to 15 days. Additionally, how the phase separation affected the solution rheology, the coagulation process and PAN cyclization were explored. The addition of AL in PAN/DMSO solutions changes the solution viscosity and gelation behaviors. Also, the existence of AL-rich domains accelerates the coagulation rate of the PAN solution in water. Because AL degrades at a lower temperature than PAN, it reduces the PAN cyclization temperature but leads to a higher cyclization activation energy, which could be caused by their different initiation mechanisms. These results would be useful to understand how the addition of AL affects the PAN solution structures, solution rheology, solution coagulation behaviors, and PAN stabilization reactions.

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“…During the cooling process, those blends rich in DTE versus DTO become vitrified earlier decreasing time for Ostwald ripening, the process by which smaller droplets dissolve and larger droplets expand, and coalescence of the solvent rich phases. 61,[69][70][71][72] This results in an increased number of total micropores with decreased individual sizes of the pores when compared to the DTO rich blends, which have increased opportunity to undergo the aforementioned phenomena prior to vitrification.…”

Section: Discussionmentioning

confidence: 99%

Quantitative biorelevant profiling of material microstructure within 3D porous scaffolds via multiphoton fluorescence microscopy

et al. 2007

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This study presents a novel approach, based on fluorescence multiphoton microscopy (MPM), to image and quantitatively characterize the microstructure and cell-substrate interactions within microporous scaffold substrates fabricated from synthetic biodegradable polymers. Using fluorescently dyed scaffolds fabricated from poly(DTE carbonate)/poly(DTO carbonate) blends of varying porosity and complementary green fluorescent protein-engineered fibroblasts, we reconstructed the three-dimensional distribution of the microporous and macroporous regions in 3D scaffolds, as well as cellular morphological patterns. The porosity, pore size and distribution, strut size, pore interconnectivity, and orientation of both macroscale and microscale pores of 3D scaffolds were effectively quantified and validated using complementary imaging techniques. Compared to other scaffold characterizing techniques such as confocal imaging and scanning electron microscopy (SEM), MPM enables the acquisition of images from scaffold thicknesses greater than a hundred microns with high signal-to-noise ratio, reduced bulk photobleaching, and the elimination of the need for deconvolution. In our study, the morphology and cytoskeletal organization of cells within the scaffold interior could be tracked with high resolution within the limits of penetration of MPM. Thus, MPM affords a promising integrated platform for imaging cell-material interactions within the interior of polymeric biomaterials. '

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Phase ripening in particulate binary polymer blends

Cited by 11 publications

References 34 publications

Assessment on interactive prospectives of nanoplastics with plasma proteins and the toxicological impacts of virgin, coronated and environmentally released-nanoplastics

Assessment on interactive prospectives of nanoplastics with plasma proteins and the toxicological impacts of virgin, coronated and environmentally released-nanoplastics

Incorporation of Alkali Lignin in Polyacrylonitrile: Phase Separation, Coagulation, and Cyclization Kinetics

Quantitative biorelevant profiling of material microstructure within 3D porous scaffolds via multiphoton fluorescence microscopy

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