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Kim GW, Yun S, Jang J, Lee JB, Kim SY. Enhanced stability, formulations, and rheological properties of nanoemulsions produced with microfludization for eco-friendly process. J Colloid Interface Sci 2023; 646:311-319. [PMID: 37201459 DOI: 10.1016/j.jcis.2023.05.005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 05/03/2023] [Accepted: 05/03/2023] [Indexed: 05/20/2023]
Abstract
HYPOTHESIS Eco-friendly processes that are emerging around the world require mass production of low-energy, low-cost nanoemulsions. The process involving the high-concentrated nanoemulsions and diluting them with a large amount of solvent can certainly save the cost; however, not much detailed research has been conducted on the stability mechanism and rheological characteristics of high-concentrated nanoemulsions. EXPERIMENTS In this study, we produced nanoemulsions via the microfluidization (MF) process, comparing their dispersion stability and rheological characteristics with macroemulsions across various oil and surfactant concentrations. Droplet mobility and dispersion stability depended on these concentrations, with Asakura-Osawa-type attractive depletion considering interparticle interaction's role in stability changes. We investigated nanoemulsions' long-term stability based on turbidity and droplet size changes over four weeks, proposing a stability diagram showing four different states depending on emulsification conditions. FINDINGS We explored the microstructure of emulsions under varying mixing conditions, observing their effects on droplet mobility and rheological properties. We monitored changes in rheology, turbidity, and droplet size over 4 weeks, establishing stability diagrams for macro- and nanoemulsions. The stability diagrams revealed that the stability of emulsions are sensitively dependent on the droplet size, concentrations, surfactant cocentrations and the strcture of coexistent phases in case of macroscopic segregation are significantly different depending on the droplet sizes. We identified their respective stability mechanisms and discovered the relationship between stability and rheological properties for highly concentrated nanoemulsion.
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Affiliation(s)
- Geon Woong Kim
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea
| | - Seunghan Yun
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea
| | - Jihui Jang
- Cosmax R&I Center, Building E, Pangyo Innovalley, 255 Pangyo-ro, Bundang-gu, Seongnam 13486, Korea
| | - Jun Bae Lee
- Cosmax R&I Center, Building E, Pangyo Innovalley, 255 Pangyo-ro, Bundang-gu, Seongnam 13486, Korea
| | - So Youn Kim
- School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National University, Seoul 08826, Republic of Korea.
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Bahadur J, Das A, Kumar S, Prakash J, Sen D, Aswal VK. Polymer-mediated interaction between nanoparticles during hydration and dehydration: a small-angle X-ray scattering study. Phys Chem Chem Phys 2021; 23:14818-14829. [PMID: 34212952 DOI: 10.1039/d1cp00528f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polymer-mediated interactions such as DNA-protein binding, protein aggregation, and filler reinforcement in polymers play crucial roles in many important biological and industrial processes. In this work, we report a detailed investigation of interactions between nanoparticles in the presence of high volume fractions of an adsorbing polymer. Small-angle X-ray scattering (SAXS) revealed the existence of a stable gel-like structure in the polymer-nanoparticle dispersion, whereby anchored polymer molecules on nanoparticles acted as bridging centres, while basic interactions between nanoparticles remained repulsive. Time-resolved SAXS measurements showed that the local volume fraction of nanoparticles increased during the drying of the dispersion owing to the shrinkage of the gel-like structure. Further, nanoparticle clusters in the dehydrated composite films showed percolated networks of nanoparticles, except for 5% loading that showed a phase-separated morphology as the volume fraction of nanoparticles remained lower than the percolation threshold. A significant restructuring of nanoparticle clusters occurred upon the hydration of nanocomposite films caused by the expansion of polymer networks induced by hydration forces. Temporal evolution of the volume fraction of nanoparticles during dehydration unveiled three distinct stages similar to the logistic growth function and this was attributed to the evaporation of free, intermediate, and bound water in the different stages. A plausible mechanism was elucidated based on the spring action analogy between anchored polymer chains and nanoparticles during hydration and dehydration processes.
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Affiliation(s)
- Jitendra Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - Avik Das
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - Sugam Kumar
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India.
| | - Jyoti Prakash
- Glass and Advanced Ceramic Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
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Gupta A, Sarkar FK, Sarkar R, Jamatia R, Lee CY, Gupta G, Pal AK. Development of a new catalytic and sustainable methodology for the synthesis of benzodiazepine triazole scaffold using magnetically separable CuFe
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@MIL‐101(Cr) nano‐catalyst in aqueous medium. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5782] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ajay Gupta
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Fillip Kumar Sarkar
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Rajib Sarkar
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Ramen Jamatia
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
| | - Chang Yeon Lee
- Department of Energy and Chemical Engineering/Innovation Centre for Chemical EngineeringIncheon National University 119 Academy‐ro, Yeonsu‐gu Incheon 22012 Republic of Korea
| | - Gajendra Gupta
- Department of Energy and Chemical Engineering/Innovation Centre for Chemical EngineeringIncheon National University 119 Academy‐ro, Yeonsu‐gu Incheon 22012 Republic of Korea
| | - Amarta Kumar Pal
- Department of Chemistry, Centre for Advanced StudiesNorth‐Eastern Hill University Shillong 793022 India
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Oh SM, Abbasi M, Shin TJ, Saalwächter K, Kim SY. Initial Solvent-Driven Nonequilibrium Effect on Structure, Properties, and Dynamics of Polymer Nanocomposites. PHYSICAL REVIEW LETTERS 2019; 123:167801. [PMID: 31702348 DOI: 10.1103/physrevlett.123.167801] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Indexed: 06/10/2023]
Abstract
Unusual structures and dynamic properties found in polymer nanocomposites (PNCs) are often attributed to immobilized (adsorbed) polymers at nanoparticle-polymer interfaces, which are responsible for reducing the intrinsic incompatibility between nanoparticles and polymers in PNCs. Although tremendous effort has been made to characterize the presence of immobilized polymers, a systematic understanding of the structure and dynamics under different processing conditions is still lacking. Here, we report that the initial dispersing solvent, which is not present after producing PNCs, drives these nonequilibrium effects on polymer chain dynamics at interfaces. Employing extensive small-angle scattering, proton NMR spectroscopy, and rheometry experiments, we found that the thickness of the immobilized layer can be dependent on the initial solvent, changing the structure and the properties of the PNC significantly. In addition, we show that the outcome of the initial solvent effect becomes more effective at particle volume fractions where the immobile layers begin to interact.
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Affiliation(s)
- Sol Mi Oh
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil Ulsan 44919, Republic of Korea
| | - Mozhdeh Abbasi
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Straβe 7, D-06120 Halle, Germany
| | - Tae Joo Shin
- UNIST Central Research Facilities & School of Natural Science, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil Ulsan 44919, Republic of Korea
| | - Kay Saalwächter
- Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Straβe 7, D-06120 Halle, Germany
| | - So Youn Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil Ulsan 44919, Republic of Korea
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Rheological and Interfacial Properties of Colloidal Electrolytes. CHINESE JOURNAL OF POLYMER SCIENCE 2019. [DOI: 10.1007/s10118-019-2334-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Saratale RG, Karuppusamy I, Saratale GD, Pugazhendhi A, Kumar G, Park Y, Ghodake GS, Bharagava RN, Banu JR, Shin HS. A comprehensive review on green nanomaterials using biological systems: Recent perception and their future applications. Colloids Surf B Biointerfaces 2018; 170:20-35. [DOI: 10.1016/j.colsurfb.2018.05.045] [Citation(s) in RCA: 188] [Impact Index Per Article: 31.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2017] [Revised: 05/17/2018] [Accepted: 05/19/2018] [Indexed: 01/18/2023]
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Kwon NK, Kim H, Han IK, Shin TJ, Lee HW, Park J, Kim SY. Enhanced Mechanical Properties of Polymer Nanocomposites Using Dopamine-Modified Polymers at Nanoparticle Surfaces in Very Low Molecular Weight Polymers. ACS Macro Lett 2018; 7:962-967. [PMID: 35650973 DOI: 10.1021/acsmacrolett.8b00475] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
While incorporation of nanoparticles in a polymer matrix generally enhances the physical properties, effective control of the nanoparticle/polymer interface is often challenging. Here, we report a dramatic enhancement of the mechanical properties of polymer nanocomposites (PNCs) using a simple physical grafting method. The PNC consists of low molecular weight poly(ethylene glycol) (PEG) and silica nanoparticles whose surfaces are modified with dopamine-modified PEG (DOPA-mPEG) brush polymers. With DOPA-mPEG grafting, the nanoparticle surface can be readily altered, and the shear modulus of the PNC is increased by a factor of 105 at an appropriate surface grafting density. The detailed microstructure and mechanical properties are examined with small-angle X-ray scattering (SAXS) and oscillatory rheometry experiments. The attractive interactions between particles induced by DOPA-mPEG grafting dramatically improve the mechanical properties of PNCs even in an unentangled polymer matrix, which shows a much higher shear modulus than that of a highly entangled polymer matrix.
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Lepcio P, Ondreas F, Zarybnicka K, Zboncak M, Caha O, Jancar J. Bulk polymer nanocomposites with preparation protocol governed nanostructure: the origin and properties of aggregates and polymer bound clusters. SOFT MATTER 2018; 14:2094-2103. [PMID: 29487934 DOI: 10.1039/c8sm00150b] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polymer nanocomposites (PNCs) hold great promise as future lightweight functional materials processable by additive manufacturing technologies. However, their rapid deployment is hindered by their performance depending strongly on the nanoparticle (NP) spatial organization. Therefore, the ability to control nanoparticle dispersion in the process of PNC preparation is a crucial prerequisite for utilizing their potential in functional composites. We report on the bulk processing technique of tailored NP spatial organization in a model glass forming polymer matrix controlled by structural and kinetic variables of the preparation protocol. Namely, we studied the impact of solvent on the NP arrangement, which was already known as a tuning parameter of the solid-state structure. We emphasized the qualitative differences between "poorly dispersed" NP arrays, which, by combination of rheological assessment and structural analysis (TEM, USAXS), we identified as chain bound clusters and aggregates of either thermodynamic or kinetical origin. They are characterized by substantially distinct formation kinetics and mismatched properties compared to each other and individually dispersed NPs. We quantitatively linked all the currently observed types of NP dispersion with their rheological properties during the solution blending step and the amount of polymer adsorption and depletion attraction. We propose the ratio of NP-polymer and NP-solvent enthalpy of adsorption as a parameter capable of the quantitative prediction of NP arrangement in systems similar to our current model PNC. Finally, we bring forth the comparison of glass transition temperatures to further demonstrate the importance of NP spatial organization in PNCs.
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Affiliation(s)
- Petr Lepcio
- Central European Institute of Technology, Brno University of Technology, Purkynova 656/123, Brno 61200, Czech Republic.
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Kwon NK, Lee TK, Kwak SK, Kim SY. Aggregation-Driven Controllable Plasmonic Transition of Silica-Coated Gold Nanoparticles with Temperature-Dependent Polymer-Nanoparticle Interactions for Potential Applications in Optoelectronic Devices. ACS APPLIED MATERIALS & INTERFACES 2017; 9:39688-39698. [PMID: 29053247 DOI: 10.1021/acsami.7b13123] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Localized surface plasmon resonance (LSPR) effect relies on the shape, size, and dispersion state of metal nanoparticles and can potentially be employed in many applications such as chemical/biological sensor, optoelectronics, and photocatalyst. While complicated synthetic approaches changing shape and size of nanoparticles can control the intrinsic LSPR effect, here we show that controlling interparticle interactions with silica-coated gold nanoparticles (Au@SiO2 NPs) is a powerful approach, permitting wide range of optical bandwidth of gold nanoparticles with great stability. The interparticle interactions of Au@SiO2 NPs are controlled through concentration-, temperature-, and time-dependent polymer-induced interactions. The polymer-induced interactions modulate the state of particle dispersion, resulting an effective plasmonic shift by more than 200 nm. We further explore the microstructure of particle aggregation and explain mechanisms of plasmonic shift based on the results of small-angle X-ray scattering (SAXS) and discrete dipole approximation (DDA) calculation. We show that an effective control of LSPR behavior is now available through trapped aggregation of Au@SiO2 NPs with temperature variation. We anticipate that the suggested strategy can be employed in many practical applications such as optical bioimaging and optoelectronic devices.
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Affiliation(s)
- Na Kyung Kwon
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Tae Kyung Lee
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - Sang Kyu Kwak
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
| | - So Youn Kim
- School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST) , Ulsan 44919, Republic of Korea
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Kim S, Hyun K, Struth B, Ahn KH, Clasen C. Structural Development of Nanoparticle Dispersion during Drying in Polymer Nanocomposite Films. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01939] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Sunhyung Kim
- Department
of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
| | - Kyu Hyun
- School
of Chemical and Biomolecular Engineering, Pusan National University, Jangjeon-Dong 30, Busan 609-735, Republic of Korea
| | | | - Kyung Hyun Ahn
- School
of Chemical and Biological Engineering, Institute of Chemical Process, Seoul National University, Seoul 151-744, Republic of Korea
| | - Christian Clasen
- Department
of Chemical Engineering, KU Leuven, Celestijnenlaan 200F, B-3001 Heverlee, Belgium
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