The role of physicochemical properties in the nanoprecipitation of cellulose acetate

Ghasemi, Seyed Morteza; Alavifar, Seyedeh Sepideh

doi:10.1016/j.carbpol.2019.115628

Cited by 6 publications

(5 citation statements)

References 53 publications

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“…[ 43 ] Results of the study suggest that for ternary systems of the same polymer and non‐solvent combination but different solvent mixtures, the system with the larger two phase region will precipitate faster, i.e., at lower vol% of the non‐solvents. [ 43 ] This trend can also be related to the value of the experimentally fitted polymer‐non‐solvent interaction parameter χ 13 . (Table S2, Supporting Information).…”

Section: Resultsmentioning

confidence: 99%

“…A recent study reports a similar relationship for CA wherein the authors have correlated faster CA precipitation to a larger sized two‐phase region in the ternary phase diagram. [ 43 ] Results of the study suggest that for ternary systems of the same polymer and non‐solvent combination but different solvent mixtures, the system with the larger two phase region will precipitate faster, i.e., at lower vol% of the non‐solvents. [ 43 ] This trend can also be related to the value of the experimentally fitted polymer‐non‐solvent interaction parameter χ 13 .…”

Section: Resultsmentioning

confidence: 99%

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Toward Sustainable Crop Protection: Aqueous Dispersions of Biodegradable Particles with Tunable Release and Rainfastness

Pirzada

Sohail

Tripathi

et al. 2021

Adv Funct Materials

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Fabrication of aqueous particulate dispersions of biodegradable cellulose esters (CEs) as efficient carriers of agrochemical active‐ingredients (AIs) for foliar applications, is reported. The use of different ester substituent groups on CE permits modulation of particle morphology and size, from irregular shapes (<350 nm) to spheres (≈1.1 µm diameter), while maintaining stability as supported by minimal change in zeta potential and particle size over one year. Rainfastness is tested by simulating >50 mm h−1 rainfall on coated banana and tomato leaves and silicon. Surface coverage loss as low as 9%, based on the nature of leaf and formulation, confirms the rainfastness of the formulations. Variation in the release kinetics of a model AI fluopyram from different CEs can be attributed to the particle morphology and the nature of binding between fluopyram and various CEs. Thermodynamic analysis demonstrates spontaneous binding between fluopyram and multiple sites of CEs, justifying its two‐step release from CE particles. System functionalities are corroborated via in‐vitro fungal inhibition assays demonstrating a 100% inhibition of the fungal growth. This “lab‐to‐leaf” approach of materials development involving fundamental insights and functional performance reveals CE dispersions are promising green agricultural formulations with the potential to impact a myriad of crops around the globe.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Toward Sustainable Crop Protection: Aqueous Dispersions of Biodegradable Particles with Tunable Release and Rainfastness

Pirzada

Sohail

Tripathi

et al. 2021

Adv Funct Materials

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“…The cellulose acetate polymer is the most interesting of the cellulose derivatives for a wide variety of applications [ 15 , 16 ]. Due to its properties, including its relatively low cost, biocompatibility, biodegradation in human and animals [ 16 , 17 ], nonpoisonousness, mechanical strength, and dissolution in water, cellulose acetate has mainly been utilized in the field of TE [ 15 , 17 , 18 ]. It has also found use in bioapplications, drug delivery, antibacterial applications, and wound dressings [ 16 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Properties of a Honeycomb-like Pattern with Cellulose Acetate and Silver Nanoparticles

et al. 2021

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This study involved the preparation and characterization of structures with a honeycomb-like pattern (HCP) formed using the phase separation method using a solution mixture of chloroform and methanol together with cellulose acetate. Fluorinated ethylene propylene modified by plasma treatment was used as a suitable substrate for the formation of the HCP structures. Further, we modified the HCP structures using silver sputtering (discontinuous Ag nanoparticles) or by adding Ag nanoparticles in PEG into the cellulose acetate solution. The material morphology was then determined using atomic force microscopy (AFM) and scanning electron microscopy (SEM), while the material surface chemistry was studied using energy dispersive spectroscopy (EDS) and wettability was analyzed with goniometry. The AFM and SEM results revealed that the surface morphology of pristine HCP with hexagonal pores changed after additional sample modification with Ag, both via the addition of nanoparticles and sputtering, accompanied with an increase in the roughness of the PEG-doped samples, which was caused by the high molecular weight of PEG and its gel-like structure. The highest amount (approx. 25 at %) of fluorine was detected using the EDS method on the sample with an HCP-like structure, while the lowest amount (0.08%) was measured on the PEG + Ag sample, which revealed the covering of the substrate with biopolymer (the greater fluorine extent means more of the fluorinated substrate is exposed). As expected, the thickness of the Ag layer on the HCP surface depended on the length of sputtering (either 150 s or 500 s). The sputtering times for Ag (150 s and 500 s) corresponded to layers with heights of about 8 nm (3.9 at % of Ag) and 22 nm (10.8 at % of Ag), respectively. In addition, we evaluated the antibacterial potential of the prepared substrate using two bacterial strains, one Gram-positive of S. epidermidis and one Gram-negative of E. coli. The most effective method for the construction of antibacterial surfaces was determined to be sputtering (150 s) of a silver nanolayer onto a HCP-like cellulose structure, which proved to have excellent antibacterial properties against both G+ and G− bacterial strains.

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“…Subsequently, drug-loaded nanoparticles were prepared using nanoprecipitation method. 50,51 A total of 2 mg of doxorubicin (or 1 mg of gefitinib) and 4 mg of amino-terminated PLGA were dissolved in 1 mL of dimethyl sulfoxide. Once fully dissolved, the mixture was slowly added dropwise into 4 mL of a 0.2% sGLP solution while stirring for 30 minutes.…”

Section: Methodsmentioning

confidence: 99%

“…Subsequently, drug-loaded nanoparticles were prepared using nanoprecipitation method. 50,51 A total of 2 mg of doxorubicin (or 1 mg of gefitinib) and 4 mg of Scheme 1 Schematic representation of the mechanism by which gefitinib downregulates CD47 expression on cell surface, and the conceptual design of pro-phagocytic mixed nanoparticles to boost ''eat-me'' signaling and attenuate ''don't-eat-me'' signaling for chemo-immunotherapy. After the internalization of the mixed nanodrugs into tumor cells, gefitinib was released from nano-formulation and downregulated cell surface CD47 expression by facilitating the translocation of CD47 from membrane to endosome, thereby attenuating the ''don't-eat-me'' signal.…”

Section: Preparation and Characterization Of Nanoparticlesmentioning

confidence: 99%

Improving nanochemoimmunotherapy efficacy by boosting “eat-me” signaling and downregulating “don't-eat-me” signaling with Ganoderma lucidum polysaccharide-based drug delivery

Pang,

Wei,

Zhao

et al. 2023

J. Mater. Chem. B

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The role of physicochemical properties in the nanoprecipitation of cellulose acetate

Cited by 6 publications

References 53 publications

Toward Sustainable Crop Protection: Aqueous Dispersions of Biodegradable Particles with Tunable Release and Rainfastness

Toward Sustainable Crop Protection: Aqueous Dispersions of Biodegradable Particles with Tunable Release and Rainfastness

Antibacterial Properties of a Honeycomb-like Pattern with Cellulose Acetate and Silver Nanoparticles

Improving nanochemoimmunotherapy efficacy by boosting “eat-me” signaling and downregulating “don't-eat-me” signaling with Ganoderma lucidum polysaccharide-based drug delivery

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