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Yetkin M, Wani YM, Kritika K, Howard MP, Kappl M, Butt HJ, Nikoubashman A. Structure Formation in Supraparticles Composed of Spherical and Elongated Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1096-1108. [PMID: 38153401 DOI: 10.1021/acs.langmuir.3c03410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
We studied the evaporation-induced formation of supraparticles from dispersions of elongated colloidal particles using experiments and computer simulations. Aqueous droplets containing a dispersion of ellipsoidal and spherical polystyrene particles were dried on superamphiphobic surfaces at different humidity values that led to varying evaporation rates. Supraparticles made from only ellipsoidal particles showed short-range lateral ordering at the supraparticle surface and random orientations in the interior regardless of the evaporation rate. Particle-based simulations corroborated the experimental observations in the evaporation-limited regime and showed an increase in the local nematic ordering as the diffusion-limited regime was reached. A thin shell of ellipsoids was observed at the surface when supraparticles were made from binary mixtures of ellipsoids and spheres. Image analysis revealed that the supraparticle porosity increased with an increasing aspect ratio of the ellipsoids.
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Affiliation(s)
- Melis Yetkin
- Department of Physics at Interfaces, Max-Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Yashraj M Wani
- Institute of Physics, Johannes Gutenberg University of Mainz, Staudingerweg 7, Mainz 55128, Germany
| | - Kritika Kritika
- Institute of Physics, Johannes Gutenberg University of Mainz, Staudingerweg 7, Mainz 55128, Germany
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden 01069, Germany
- Institut für Theoretische Physik, Technische Universität Dresden, Dresden 01069, Germany
| | - Michael P Howard
- Department of Chemical Engineering, Auburn University, Auburn, Alabama 36849, United States
| | - Michael Kappl
- Department of Physics at Interfaces, Max-Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Hans-Jürgen Butt
- Department of Physics at Interfaces, Max-Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germany
| | - Arash Nikoubashman
- Institute of Physics, Johannes Gutenberg University of Mainz, Staudingerweg 7, Mainz 55128, Germany
- Leibniz-Institut für Polymerforschung Dresden e.V., Hohe Straße 6, Dresden 01069, Germany
- Institut für Theoretische Physik, Technische Universität Dresden, Dresden 01069, Germany
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2
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Mehta S, Bahadur J, Sharma SK, Sen D. Interparticle interaction-dependent jamming in colloids: insights into glass transition and morphology modulation during rapid evaporation-induced assembly. SOFT MATTER 2024; 20:375-387. [PMID: 38099855 DOI: 10.1039/d3sm01186k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Understanding the role of interparticle interactions in jamming phenomena is essential for gaining insights into the intriguing glass transition behavior observed in atomic and molecular systems. In this study, we investigate the jamming behavior of colloids with tunable interparticle interactions during evaporation-induced assembly (EIA). By manipulating the interaction among charged colloids using cationic polyethyleneimine (PEI) through electro-sorption and subsequent free polymer induced repulsion, we observe distinct jamming behavior in silica colloids during EIA, depending on the interparticle interactions. Silica colloids with strong repulsive interactions exhibit a repulsive colloidal glass state with a volume fraction of silica colloids in supraparticle ϕ ∼ 0.70. On the other hand, PEI-mediated attractive interactions among silica colloids lead to an attractive colloidal glass phase with a significantly lower ϕ ∼ 0.43. Free polymer induced repulsion of colloids at higher PEI concentration once again results in a repulsive glassy state with ϕ ∼ 0.61. Furthermore, we revealed that interparticle interactions not only influence the jamming behavior but also play a significant role in shaping the morphology of self-assembled structures during EIA, and the assembled structure undergoes a morphological reentrant transition from a doughnut-like shape to a spherical form and again back to a doughnut-like configuration. Jamming-dependent evolution of micropores and dynamics of the confined PEI have been probed using positron annihilation lifetime spectroscopy (PALS) and broadband dielectric spectroscopy (BDS). PALS reveals distinct variations in the micropores of the supraparticles with different PEI loadings, confirming the impact of jamming on the evolution of the micropores within the supraparticles. BDS measurements uncover non-monotonic dynamics of PEI molecules confined in the evolved pore network. It is revealed that the reentrant jamming behavior of colloids, modulated by PEI, holds profound significance for the long-term stability of supraparticles.
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Affiliation(s)
- Swati Mehta
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Jitendra Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Sandeep K Sharma
- Radiochemistry Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
- Homi Bhabha National Institute, Anushaktinagar, Mumbai 400094, India
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Mehta S, Bahadur J, Sen D, Nechiyil D, Bhatt H, Kumar N, Prakash J. Polyethyleneimine-assisted formation of Ag-SiO 2 hybrid microspheres for H 2O 2 sensing and SERS applications. RSC Adv 2023; 13:29086-29098. [PMID: 37800133 PMCID: PMC10548522 DOI: 10.1039/d3ra04095j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Accepted: 09/15/2023] [Indexed: 10/07/2023] Open
Abstract
Herein, we report a simple, cost-effective, and eco-friendly approach for producing polyethyleneimine (PEI)-assisted silver nanoparticle-supported silica microspheres through evaporation-induced assembly (EIA). The silica-PEI microspheres obtained through EIA consisted of highly trapped PEI molecules owing to their electrosorption onto oppositely charged silica colloids. The trapped PEI molecules in the microspheres played a crucial role in linking silver ions to form silver ion-PEI complexes, which were then reduced to form silver nanoparticles. Further, the complex interactions between PEI and silica colloids led to enhanced porosity in the microspheres, enabling the efficient adsorption of Ag ions. The characterization of the Ag-SiO2 microspheres was carried out using various techniques, including field-emission scanning electron microscopy (FESEM), energy dispersive X-ray (EDX) spectroscopy, X-ray diffraction (XRD), small-angle X-ray scattering (SAXS), and Fourier transform infrared (FTIR) spectroscopy, which confirmed the successful formation of Ag nanoparticles on microspheres, and a plausible formation mechanism is elucidated. The Ag-SiO2 microspheres exhibited good sensing properties for hydrogen peroxide (H2O2), with an estimated limit of detection of 1.08 mM and a sensitivity of 0.033 μA mM-1 mm-2. The microspheres were also used as a surface-enhanced Raman scattering (SERS) substrate, which demonstrated high sensitivity in detecting rhodamine 6G down to a concentration of 2 × 10-6 M. The present approach elucidates a promising alternative to conventional methods that face challenges, such as scalability issues, complex and cumbersome synthesis procedures, and the use of strong reducing agents. With the potential for industrial-level scalability, this method offers a viable strategy for producing Ag-SiO2 microspheres with possible applications in biomedical and sensing technologies.
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Affiliation(s)
- Swati Mehta
- Solid State Physics Division, Bhabha Atomic Research Centre Mumbai 400085 India
- Homi Bhabha National Institute Mumbai 400094 India
| | - Jitendra Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre Mumbai 400085 India
- Homi Bhabha National Institute Mumbai 400094 India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre Mumbai 400085 India
- Homi Bhabha National Institute Mumbai 400094 India
| | - Divya Nechiyil
- Materials Group, Bhabha Atomic Research Centre Mumbai 400085 India
| | - H Bhatt
- High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre Mumbai 400085 India
- Homi Bhabha National Institute Mumbai 400094 India
| | - Naveen Kumar
- Atomic and Molecular Physics Division, Bhabha Atomic Research Centre Mumbai 400085 India
| | - Jyoti Prakash
- Homi Bhabha National Institute Mumbai 400094 India
- Materials Group, Bhabha Atomic Research Centre Mumbai 400085 India
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Chen H, Zhang Y, Wang H, Dong X, Zang D. Evaporation Caused Invaginations of Acoustically Levitated Colloidal Droplets. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 13:133. [PMID: 36616043 PMCID: PMC9824602 DOI: 10.3390/nano13010133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 12/18/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Controlled buckling of colloidal droplets via acoustic levitation plays an important role in pharmaceutical, coating, and material self-assembly. In this study, the evaporation process of PTFE colloidal droplets with two particle concentrations (60 wt% and 20 wt%) was investigated under acoustic levitation. We report the occurrence of surface invagination caused by evaporation. For the high particle concentration droplet, the upper surface was invaginated, eventually forming a bowl-shaped structure. While for the low particle concentration droplet, both the upper and lower surfaces of the droplet were invaginated, resulting in a doughnut-like structure. For the acoustically levitated oblate spherical droplet, the dispersant loss at the equatorial area of the droplet is greater than that at the two poles. Therefore, the thickness of the solid shell on the surface of the droplet was not uniform, resulting in invagination at the weaker pole area. Moreover, once the droplet surface was buckling, the hollow cavity on the droplet surface would absorb the sound energy and results in strong positive acoustic radiation pressure at bottom of the invagination, thus further prompting the invagination process.
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Affiliation(s)
- Hongyue Chen
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
| | - Yongjian Zhang
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, School of Mechanical and Material Engineering, Xi’an University, Xi’an 710065, China
| | - Heyi Wang
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, School of Mechanical and Material Engineering, Xi’an University, Xi’an 710065, China
| | - Xin Dong
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, School of Mechanical and Material Engineering, Xi’an University, Xi’an 710065, China
| | - Duyang Zang
- MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, School of Physical Science and Technology, Northwestern Polytechnical University, Xi’an 710129, China
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Lee S, A. M. T, Cho G, Lee J. Control of the Drying Patterns for Complex Colloidal Solutions and Their Applications. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:2600. [PMID: 35957030 PMCID: PMC9370329 DOI: 10.3390/nano12152600] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Revised: 07/24/2022] [Accepted: 07/25/2022] [Indexed: 12/02/2022]
Abstract
The uneven deposition at the edges of an evaporating droplet, termed the coffee-ring effect, has been extensively studied during the past few decades to better understand the underlying cause, namely the flow dynamics, and the subsequent patterns formed after drying. The non-uniform evaporation rate across the colloidal droplet hampers the formation of a uniform and homogeneous film in printed electronics, rechargeable batteries, etc., and often causes device failures. This review aims to highlight the diverse range of techniques used to alleviate the coffee-ring effect, from classic methods such as adding chemical additives, applying external sources, and manipulating geometrical configurations to recently developed advancements, specifically using bubbles, humidity, confined systems, etc., which do not involve modification of surface, particle or liquid properties. Each of these methodologies mitigates the edge deposition via multi-body interactions, for example, particle-liquid, particle-particle, particle-solid interfaces and particle-flow interactions. The mechanisms behind each of these approaches help to find methods to inhibit the non-uniform film formation, and the corresponding applications have been discussed together with a critical comparison in detail. This review could pave the way for developing inks and processes to apply in functional coatings and printed electronic devices with improved efficiency and device yield.
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Affiliation(s)
- Saebom Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea;
| | - Tiara A. M.
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Korea;
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Korea
- Research Engineering Center for R2R Printed Flexible Computer, Sungkyunkwan University, Suwon 16419, Korea
| | - Gyoujin Cho
- Department of Biophysics, Sungkyunkwan University, Suwon 16419, Korea;
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Korea
- Research Engineering Center for R2R Printed Flexible Computer, Sungkyunkwan University, Suwon 16419, Korea
- Department of Intelligent Precision Healthcare Convergence, Sungkyunkwan University, Suwon 16419, Korea
| | - Jinkee Lee
- School of Mechanical Engineering, Sungkyunkwan University, Suwon 16419, Korea;
- Institute of Quantum Biophysics, Sungkyunkwan University, Suwon 16419, Korea
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Bhatt H, Bahadur J, Checker R, Ajgaonkar P, Vishwakarma SR, Sen D. Influence of molecular interactions on structure, controlled release and cytotoxicity of curcumin encapsulated chitosan - Silica nanostructured microspheres. Colloids Surf B Biointerfaces 2021; 208:112067. [PMID: 34500202 DOI: 10.1016/j.colsurfb.2021.112067] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2021] [Revised: 08/20/2021] [Accepted: 08/22/2021] [Indexed: 01/09/2023]
Abstract
Curcumin possesses numerous medicinal benefits including anti-cancer and anti-viral properties. However, its wide scale use as a drug is often hindered owing to the dearth of suitable drug-delivery systems which can solubilise it for long-term sustained-release and safeguard its beneficial properties. In this work, a fast, one-step method, employing evaporation induced assembly of colloids, has been employed for the synthesis of curcumin encapsulated organic-inorganic hybrid micron-sized spheres. Detailed physical properties of the microspheres, with scaffolds of silica nanoparticles (∼8.5 nm) cross linked by chitosan, are studied to trace the underlying mechanism of structural assembly in such systems, by tuning the polymer matrix with solubilizing agents, DMSO and Tween 20. A systematic modification in the hydrogen bonding network, conformations and interactions between macromolecules is revealed upon tuning the organic matrix. This in turn is found to control the assembly vis-à-vis the granular morphology, drug entrapment and packing fraction of nanoparticles in the microspheres, which have direct influence on the biological properties. Consequently, the microspheres are found to follow a first order drug release kinetics with a tunable rate constant which follows the ordering of packing fraction of silica nanoparticles in the micro-granules. A sustained curcumin release for a period extending up to 24 h has been achieved. Further studies using human lung and cervical cancer cell lines assert good anti-cancer properties of these nanostructured microspheres in cancer cells, while showing no toxicity towards normal cells. Thus, such hybrid organic-inorganic formulations achieved using multi-component colloidal assembly approach, with enhanced stability against degradation, are promising candidates for future clinical applications of water-insoluble drugs.
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Affiliation(s)
- Himal Bhatt
- High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India.
| | - J Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - R Checker
- Radiation Biology & Health Safety Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - P Ajgaonkar
- High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - S R Vishwakarma
- High Pressure & Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
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Park K, Otte A, Sharifi F, Garner J, Skidmore S, Park H, Jhon YK, Qin B, Wang Y. Formulation composition, manufacturing process, and characterization of poly(lactide-co-glycolide) microparticles. J Control Release 2021; 329:1150-1161. [PMID: 33148404 PMCID: PMC7904638 DOI: 10.1016/j.jconrel.2020.10.044] [Citation(s) in RCA: 48] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Revised: 10/16/2020] [Accepted: 10/21/2020] [Indexed: 11/30/2022]
Abstract
Injectable long-acting formulations, specifically poly(lactide-co-glycolide) (PLGA) based systems, have been used to deliver drugs systemically for up to 6 months. Despite the benefits of using this type of long-acting formulations, the development of clinical products and the generic versions of existing formulations has been slow. Only about two dozen formulations have been approved by the U.S. Food and Drug Administration during the last 30 years. Furthermore, less than a dozen small molecules have been incorporated and approved for clinical use in PLGA-based formulations. The limited number of clinically used products is mainly due to the incomplete understanding of PLGA polymers and the various variables involved in the composition and manufacturing process. Numerous process parameters affect the formulation properties, and their intricate interactions have been difficult to decipher. Thus, it is necessary to identify all the factors affecting the final formulation properties and determine the main contributors to enable control of each factor independently. The composition of the formulation and the manufacturing processes determine the essential property of each formulation, i.e., in vivo drug release kinetics leading to their respective pharmacokinetic profiles. Since the pharmacokinetic profiles can be correlated with in vitro release kinetics, proper in vitro characterization is critical for both batch-to-batch quality control and scale-up production. In addition to in vitro release kinetics, other in vitro characterization is essential for ensuring that the desired formulation is produced, resulting in an expected pharmacokinetic profile. This article reviews the effects of a selected number of parameters in the formulation composition, manufacturing process, and characterization of microparticle systems. In particular, the emphasis is focused on the characterization of surface morphology of PLGA microparticles, as it is a manifestation of the formulation composition and the manufacturing process. Also, the implication of the surface morphology on the drug release kinetics is examined. The information described here can also be applied to in situ forming implants and solid implants.
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Affiliation(s)
- Kinam Park
- Purdue University, Biomedical Engineering and Pharmaceutics, 206 S. Martin Jischke Drive, West Lafayette, IN 47907, USA; Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA.
| | - Andrew Otte
- Purdue University, Biomedical Engineering and Pharmaceutics, 206 S. Martin Jischke Drive, West Lafayette, IN 47907, USA
| | - Farrokh Sharifi
- Purdue University, Biomedical Engineering and Pharmaceutics, 206 S. Martin Jischke Drive, West Lafayette, IN 47907, USA
| | - John Garner
- Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA
| | - Sarah Skidmore
- Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA
| | - Haesun Park
- Akina, Inc., 3495 Kent Avenue, Suite A200, West Lafayette, IN 47906, USA
| | - Young Kuk Jhon
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Pharmaceutical Quality, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
| | - Bin Qin
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
| | - Yan Wang
- Food and Drug Administration, Center for Drug Evaluation and Research, Office of Generic Drugs, 10903 New Hampshire Avenue, Silver Spring, MD 20993, USA
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de Souza Lima R, Braeuer A, Arlabosse P, Ré MI. In situ Raman composition profiling in drying droplets. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.05.109] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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de Souza Lima R, Ré MI, Arlabosse P. Drying droplet as a template for solid formation: A review. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2019.09.052] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Udoh CE, Garbin V, Cabral JT. Polymer nanocomposite capsules formed by droplet extraction: spontaneous stratification and tailored dissolution. SOFT MATTER 2019; 15:5287-5295. [PMID: 31215582 DOI: 10.1039/c9sm00708c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report the formation of polymeric and nanocomposite capsules via droplet solvent extraction, focusing on the interplay between solvent exchange and removal, demixing and directional solidification kinetics. We investigate a model system of sodium poly(styrene sulfonate), NaPSS and silica nanoparticles in aqueous solution, whose phase behaviour is experimentally measured, and examine a series of selective extraction solvents (toluene, butyl acetate, ethyl acetate and methyl ethyl ketone), ranging from 0.04 to 11% v/v water solubility. Tuning the rate of solvent exchange is shown to provide an effective means of decoupling demixing and solidification timescales, and thereby tunes the internal microstructure of the capsule, including hollow, microporous, core-shell, and bicontinuous morphologies. In turn, these determine the capsule dissolution mechanism and kinetics, ranging from single to pulsed release profiles of nanoparticle clusters (at intermediate solubilities), to minimal dissolution (at either extremes). These findings provide facile design and assembly strategies for functional capsules with time-varying release profiles.
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Affiliation(s)
- Christiana E Udoh
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
| | - Valeria Garbin
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
| | - João T Cabral
- Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK.
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Koyanagi K, Kudo K, Yanagisawa M. Sol-Gel Coexisting Phase of Polymer Microgels Triggers Spontaneous Buckling. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2283-2288. [PMID: 30640471 DOI: 10.1021/acs.langmuir.8b03751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Mechanical buckling is a ubiquitous phenomenon of elastic bodies like core-shell microgels. Although conventional theory predicts that sufficiently high pressure is the primary factor inducing the buckling of core-shell microgels, they often buckle spontaneously without applying pressure. We explored such spontaneous buckling of microgels by introducing interfacial tension between the gel phase of the shell and sol phase of the core. Thus, we found that the core-shell microgels in a sol-gel coexisting phase with a certain shell thickness ratio exhibit spontaneous buckling. According to our theoretical analysis, spontaneous buckling occurs due to the balance between the gel elasticity E and interfacial tension γ when the characteristic length γ/ E is comparable to the microgel size R. Moreover, we found that the ratio between γ/ E and R determines the buckling condition of the shell thickness ratio. Our findings establish an important framework for applying spontaneous buckling to the shape control of elastic bodies.
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Affiliation(s)
- Keisuke Koyanagi
- Department of Applied Physics , Tokyo University of Agriculture and Technology , Naka-cho 2-24-16, Koganei, Tokyo 184-8588 , Japan
| | - Kazue Kudo
- Department of Computer Science , Ochanomizu University , Otsuka 2-1-1, Bunkyo, Tokyo 112-8610 , Japan
| | - Miho Yanagisawa
- Department of Applied Physics , Tokyo University of Agriculture and Technology , Naka-cho 2-24-16, Koganei, Tokyo 184-8588 , Japan
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12
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Biswas P, Sen D, Ha JM, Choi SM. Anisotropic interaction driven surface modulation on spray-dried microgranules. J Colloid Interface Sci 2018; 538:149-158. [PMID: 30502536 DOI: 10.1016/j.jcis.2018.11.056] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Revised: 11/09/2018] [Accepted: 11/13/2018] [Indexed: 11/16/2022]
Abstract
Rapid evaporation of solvent from spray colloidal droplets induces directed self-assembly among the nanoparticles, eventually interlocking them into correlated granular structures. In this work, it is demonstrated that anisotropy in colloidal interparticle interaction plays a key role in governing the surface topology of spray-dried granules. Colloidal dispersion comprised of spherical nanosilica (NS) and cylindrical carbon nanotubes (CNT) was chosen as a model system in this regard. For identical polarities of the colloidal components, granules with prominent wrinkle-like modulations are obtained, which is in drastic contrast with the case of opposite polarities. The extent of surface modulation depends on the relative concentration of CNT with respective to NS. A plausible mechanism for the formation of surface modulation is elucidated on the basis of the evolving anisotropic interparticle interactions during assembly. Electron microscopy, small-angle scattering, Raman spectroscopic techniques have been used for quantitative characterization of these micro-granules.
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Affiliation(s)
- Priyanka Biswas
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India
| | - Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India; Homi Bhabha National Institute, Mumbai 400094, India.
| | - Jae-Min Ha
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305701, Korea
| | - Sung-Min Choi
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 305701, Korea
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Osman A, Shahidzadeh N, Stitt H, Shokri N. Morphological transformations during drying of surfactant-nanofluid droplets. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.06.019] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Sen D, Das A, Bahadur J, Choudhury N. Dynamic modulation of inter-particle correlation during colloidal assembly in a confined medium: revealed by real time SAXS. Phys Chem Chem Phys 2018; 20:13271-13278. [PMID: 29457174 DOI: 10.1039/c8cp00401c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using real time small-angle X-ray scattering, we ellucidate a hitherto unobserved non-monotonic evolution of inter-particle correlation while colloidal particles assemble across pore boundary in a confined medium under influence of solvent evaporation. Time variation of local volume fraction of the particles passes through distinct modulation prior to reaching equilibrium. It has been demonstrated that the amplitude of oscillation depends strongly on size of the assembling particles. We comprehend such non-linear temporal evolution of particle correlation through density functional theory and molecular dynamics simulation.
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Affiliation(s)
- Debasis Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| | - Avik Das
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India. and Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
| | - Jitendra Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai-400085, India.
| | - Niharendu Choudhury
- Theoretical Chemistry Section, Bhabha Atomic Research Centre, Mumbai-400085, India and Homi Bhabha National Institute, Anushaktinagar, Mumbai-400094, India
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15
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Sessile nanofluid droplet can act like a crane. J Colloid Interface Sci 2018; 512:497-510. [PMID: 29096111 DOI: 10.1016/j.jcis.2017.10.084] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/17/2017] [Accepted: 10/23/2017] [Indexed: 11/23/2022]
Abstract
Interactive droplet systems form the backbone for emerging avenues in droplet based technologies like cell sorting, inkjet printing and digital microfluidics, to name a few. These and their associated fields have gained significant importance in the recent times. Here, we report one such phenomenon wherein a naturally evaporating nanocolloidal sessile droplet interacts with a porous silica gel bead to mimic a macro scale mechanical crane assembly. Precisely, we show a sequence of events displayed by the particle laden aqueous droplet (nanoparticles of silica at different loading rates placed on a hydrophobic substrate) when brought in contact with a meso-porous silica gel bead. First, preferential self-assembly along droplet-bead interface is followed by formation of an adhesive bond. The phenomenon continues until the evaporating droplet naturally lifts the bead. The kinematics of the lift mechanism can be represented by a simple four bar linkage. This work provides insights into interactions between droplets and freely placed porous objects across multiple spatio-temporal scales. Present study should not just motivate researchers to design interactive droplet based systems but also use the same to perform engineering tasks like the crane action.
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16
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Lo CH, Hu TM. From a silane monomer to anisotropic buckled silica nanospheres: a polymer-mediated, solvent-free and one-pot synthesis. SOFT MATTER 2017; 13:5950-5960. [PMID: 28770266 DOI: 10.1039/c7sm01043e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The morphology of particles, along with other particle attributes, has been shown to affect the biological fate of particles administered into the body. Particles with collapsed surfaces or shells (dimpled, buckled or crumpled) can have different appearances, under the microscope, that resemble many things encountered in our daily life, such as apples/cherries, doughnuts, and bowls. Recent studies have demonstrated that they are not just particles with interesting geometries, but they can also be used as functional blocks for assembled complex materials. Since previous research focus has been on micron-sized particles and organic solvents were often used, it is of particular interest to synthesize the nanosized counterpart with a buckled surface using a purely aqueous method. Herein we report a facile method for rapid synthesis of buckled silica nanoparticles (SiNPs) based on S-nitrosothiol chemistry in a solvent-free reaction. 3-Mercaptopropyl trimethoxysilane (MPTMS) was used as a single silane source in a one-pot aqueous solution containing sodium nitrite and polyvinyl alcohol (PVA). Upon the addition of HCl, S-nitrosation and condensation of MPTMS occur simultaneously and the reaction system undergoes a rapid transition from a clear solution to a solution containing nanoparticles with a lag time controlled mainly by the amount of HCl added. The experimental parameters were systematically studied to determine the optimal concentration of each component. For a typical reaction, sub-100 nm nanoparticles can be produced in less than 1 h, and the best result can be obtained within 2 to 4 h. Remarkably, the nanoparticle exhibits buckled surface morphologies under TEM and SEM. The average size is about 60 nm in diameter. Moreover, the solid-state Si-NMR data show that T2 and T3 silicon species are rapidly evolved with slight dynamic changes over the reaction time. Further, PVA is shown to control the surface buckling as well as to stabilize the formed particles. The as-prepared SiNPs can be used as a nitric oxide (NO) carrier with the potential to release NO in an apparent zero-order manner. In conclusion, the study demonstrates the feasibility of employing an aqueous route for efficiently preparing SiNPs with multifarious surface cavities based on S-nitrosothiol chemistry.
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Affiliation(s)
- Chih-Hui Lo
- School of Pharmacy, National Defense Medical Center, Taipei 11490, Taiwan
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17
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Hao X, Li S, Zhang D, Gong J, Ren L, Ma J, Tong Z. Facile one-step synthesis of Fe5(PO4)4(OH)3 · 2H2O hollow octahedra and their application for DNA separation. PARTICULATE SCIENCE AND TECHNOLOGY 2017. [DOI: 10.1080/02726351.2017.1295292] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Xiaoyun Hao
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
| | - Shanzhong Li
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
| | - Dongen Zhang
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
- Jiangsu Marine Resources Development Research Institute, Lianyungang, China
| | - Junyan Gong
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
| | - Lizhen Ren
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
| | - Juanjuan Ma
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
| | - Zhiwei Tong
- Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, China
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18
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Sperling M, Gradzielski M. Droplets, Evaporation and a Superhydrophobic Surface: Simple Tools for Guiding Colloidal Particles into Complex Materials. Gels 2017; 3:E15. [PMID: 30920512 PMCID: PMC6318646 DOI: 10.3390/gels3020015] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Revised: 04/09/2017] [Accepted: 04/13/2017] [Indexed: 01/05/2023] Open
Abstract
The formation of complexly structured and shaped supraparticles can be achieved by evaporation-induced self-assembly (EISA) starting from colloidal dispersions deposited on a solid surface; often a superhydrophobic one. This versatile and interesting approach allows for generating rather complex particles with corresponding functionality in a simple and scalable fashion. The versatility is based on the aspect that basically one can employ an endless number of combinations of components in the colloidal starting solution. In addition, the structure and properties of the prepared supraparticles may be modified by appropriately controlling the evaporation process, e.g., by external parameters. In this review, we focus on controlling the shape and internal structure of such supraparticles, as well as imparted functionalities, which for instance could be catalytic, optical or electronic properties. The catalytic properties can also result in self-propelling (supra-)particles. Quite a number of experimental investigations have been performed in this field, which are compared in this review and systematically explained.
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Affiliation(s)
- Marcel Sperling
- Stranski Laboratorium für Physikalische & Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany
| | - Michael Gradzielski
- Stranski Laboratorium für Physikalische & Theoretische Chemie, Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany.
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19
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Biswas P, Sen D, Mazumder S, Ramkumar J. Porous microcapsules comprised inter-locked nano-particles by evaporation-induced assembly: Evaluation of dye sorption. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.01.091] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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20
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Biswas P, Sen D, Mazumder S, Melo JS, Basak CB, Dasgupta K. Porous nano-structured micro-granules from silica-milk bi-colloidal suspension: Synthesis and characterization. Colloids Surf B Biointerfaces 2017; 154:421-428. [PMID: 28388528 DOI: 10.1016/j.colsurfb.2017.03.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 02/28/2017] [Accepted: 03/23/2017] [Indexed: 02/06/2023]
Abstract
Synthesis and characterization of nano-structured porous granules, with fairly defined morphology and porosity, is crucial because such granules are widely utilized for various technological applications. However, an easy, one-step, economic synthesis protocol for large scale production is extremely desirable. In the present work, we have reported the synthesis and characterization of the nano-structured micro-granules using aerosol drying of bi-colloidal suspension of nano-silica and milk. Removal of soft organic component from the granules results in formation of meso and macro pores with moderate specific surface area. Granule morphology and porosity depends strongly on the concentration ratio of the individual components in the drying aerosol as well as the interaction between them.
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Affiliation(s)
- Priyanka Biswas
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - D Sen
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India.
| | - S Mazumder
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - J S Melo
- Nuclear Agriculture & Biotechnology Division, Bhabha Atomic Research Centre, Mumbai, 400085, India; Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India
| | - C B Basak
- Glass and Advanced Materials Division, Bhabha Atomic Research Centre, Mumbai, 400085, India
| | - Kinshuk Dasgupta
- Materials Group, Bhabha Atomic Research Centre, Mumbai, 400085, India
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21
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Biswas P, Sen D, Mazumder S, Basak CB, Doshi P. Temperature Mediated Morphological Transition during Drying of Spray Colloidal Droplets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:2464-73. [PMID: 26900937 DOI: 10.1021/acs.langmuir.5b04171] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Understanding how a tiny dilute evaporative colloidal spray droplet gets transformed into a microgranule with a characteristic morphology is crucial from scientific as well as technological points of view. In the present work, it is demonstrated that the morphology and the size distribution of the microcapsules can be tuned simply by adjusting the drying temperature. Shape and size of the capsules are quantified at four different drying temperatures. It is shown that the morphology transits gradually from sphere to toroid with increasing temperature keeping the average volume-fraction of the correlated nanoparticles nearly unaffected for the synthesized granules. A plausible mechanism for the chronological pathway of such morphological transformation is illustrated. Computer simulation corroborates the experimentally observed morphological transition. The variation in hollowness and buckling tendency of the capsules are elucidated by scattering and imaging techniques.
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Affiliation(s)
| | - D Sen
- Homi Bhabha National Institute , Mumbai 400094, India
| | - S Mazumder
- Homi Bhabha National Institute , Mumbai 400094, India
| | | | - P Doshi
- Groton Laboratories, Pfizer Global Research and Development , Groton, 06340 Connecticut United States
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22
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Parviz D, Metzler SD, Das S, Irin F, Green MJ. Tailored Crumpling and Unfolding of Spray-Dried Pristine Graphene and Graphene Oxide Sheets. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2015; 11:2661-2668. [PMID: 25641827 DOI: 10.1002/smll.201403466] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Revised: 12/29/2014] [Indexed: 06/04/2023]
Abstract
For the first time, pristine graphene can be controllably crumpled and unfolded. The mechanism for graphene is radically different than that observed for graphene oxide; a multifaced crumpled, dimpled particle morphology is seen for pristine graphene in contrast to the wrinkled, compressed surface of graphene oxide particles, showing that surface chemistry dictates nanosheet interactions during the crumpling process. The process demonstrated here utilizes a spray-drying technique to produce droplets of aqueous graphene dispersions and induce crumpling through rapid droplet evaporation. For the first time, the gradual dimensional transition of 2D graphene nanosheets to a 3D crumpled morphology in droplets is directly observed; this is imaged by a novel sample collection device inside the spray dryer itself. The degree of folding can be tailored by altering the capillary forces on the dispersed sheets during evaporation. It is also shown that the morphology of redispersed crumpled graphene powder can be controlled by solvent selection. This process is scalable, with the ability to rapidly process graphene dispersions into powders suitable for a variety of engineering applications.
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Affiliation(s)
- Dorsa Parviz
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409, USA
- Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA
| | - Shane D Metzler
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409, USA
| | - Sriya Das
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409, USA
| | - Fahmida Irin
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409, USA
| | - Micah J Green
- Department of Chemical Engineering, Texas Tech University, Lubbock, TX, 79409, USA
- Department of Chemical Engineering, Texas A&M University, College Station, TX, 77843, USA
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23
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Lintingre É, Ducouret G, Lequeux F, Olanier L, Périé T, Talini L. Controlling the buckling instability of drying droplets of suspensions through colloidal interactions. SOFT MATTER 2015; 11:3660-3665. [PMID: 25811664 DOI: 10.1039/c5sm00283d] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The present study focuses on the drying of droplets of colloidal suspensions using the Leidenfrost effect. At the end of drying, grains show different morphologies: cups or spheres depending on the ionic strength or zeta potential of the initial suspension. High ionic strengths and low absolute zeta potential values lead to spherical morphologies. A model based on the calculations of DLVO potentials has been implemented to extract a critical pressure, which provides a quantitative criterion for buckling whatever the initial formulation is. Particularly, the buckling time is quantitatively predicted from the interparticle interactions and shows an excellent agreement with experimental values.
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Affiliation(s)
- É Lintingre
- École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris ParisTech, PSL Research University, Sciences et Ingénierie de la matière Molle, CNRS UMR7615, 10, Rue Vauquelin, F-75231 Paris Cedex 05, France.
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24
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Bahadur J, Sen D, Mazumder S, Santoro G, Yu S, Roth SV, Melnichenko YB. Colloidal Nanoparticle Interaction Transition during Solvent Evaporation Investigated by in-Situ Small-Angle X-ray Scattering. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4612-4618. [PMID: 25839830 DOI: 10.1021/la504769k] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In-situ scanning small-angle X-ray scattering (SAXS) experiments have been performed to probe the drying of a single suspended droplet of silica colloids. It has been demonstrated that the formation of a nanoparticle shell during drying can be confirmed just by measuring the temporal evolution of the spatial transmission profile across the drying droplet. The shrinkage of the droplet stops once the shell is formed. The temporal dependence of the shell thickness and droplet radius has been estimated by quantitative analysis of the functionality of the transmission profiles. It is revealed that the position of the correlation peak originating from interactions between silica nanoparticles evolves linearly during the initial stage of drying and exhibits sigmoidal growth behavior in later stages. The interaction between colloidal particles in different drying stages has been investigated. We provide experimental confirmation of the transition from repulsive interaction to a capillary-driven short-range attraction during shell formation. The present work demonstrates that in-situ scanning SAXS on a suspended droplet is an invaluable technique for monitoring the dynamic self-organization of colloids as it probes the drying of complex fluids without the interference of a substrate.
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Affiliation(s)
- J Bahadur
- †Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
- ‡Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - D Sen
- †Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S Mazumder
- †Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - G Santoro
- §Photon Science, Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85 D-22607, Hamburg, Germany
| | - S Yu
- §Photon Science, Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85 D-22607, Hamburg, Germany
| | - S V Roth
- §Photon Science, Deutsches Elektronen-Synchrotron (DESY), Notkestr. 85 D-22607, Hamburg, Germany
| | - Y B Melnichenko
- ‡Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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25
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Miglani A, Basu S. Sphere to ring morphological transformation in drying nanofluid droplets in a contact-free environment. SOFT MATTER 2015; 11:2268-78. [PMID: 25652122 DOI: 10.1039/c4sm02553a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Understanding the transients of buckling in drying colloidal suspensions is pivotal for producing new functional microstructures with tunable morphologies. Here, we report first observations and elucidate the buckling instability induced morphological transition (sphere to ring structure) in an acoustically levitated, heated nanosuspension droplet using dynamic energy balance. Droplet deformation featuring the formation of symmetric cavities is initiated by capillary pressure that is two to three orders of magnitude greater than the acoustic radiation pressure, thus indicating that the standing pressure field has no influence on the buckling front kinetics. With an increase in heat flux, the growth rate of surface cavities and their post-buckled volume increase while the buckling time period reduces, thereby altering the buckling pathway and resulting in distinct precipitate structures. However, irrespective of the heating rate, the volumetric droplet deformation exhibits a linear time dependence and the droplet vaporization is observed to deviate from the classical D(2)-law.
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Affiliation(s)
- Ankur Miglani
- Department of Mechanical Engineering, Indian Institute of Science, Bangalore, Karnataka-560012, India.
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26
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Das A, Sen D, Mazumder S, Ghosh AK, Basak CB, Dasgupta K. Formation of nano-structured core–shell micro-granules by evaporation induced assembly. RSC Adv 2015. [DOI: 10.1039/c5ra15650e] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nano-structured spherical micro-granules of core–shell morphology have been realized by utilizing the contrasting interfacial interaction of two different types of nano-particles with liquid solvent.
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Affiliation(s)
- Avik Das
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - D. Sen
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - S. Mazumder
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - A. K. Ghosh
- Membrane Development Section
- Chemical Engineering Group
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - C. B. Basak
- Glass and Advanced Materials Division
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
| | - K. Dasgupta
- Rare Earths Development Section
- Materials Group
- Bhabha Atomic Research Centre
- Mumbai – 400 085
- India
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27
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Sen D, Lakhotiya H, Das A, Bahadur J, Mazumder S, Basak CB. Organic–inorganic composite micro-granules by evaporation induced assembly: role of trapped water in structural evolution. RSC Adv 2015. [DOI: 10.1039/c4ra14703k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nano-structured composite micro-granules are promising candidates for many technological and medical applications.
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Affiliation(s)
- D. Sen
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - H. Lakhotiya
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
- Centre for Converging Technologies
| | - Avik Das
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - J. Bahadur
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - S. Mazumder
- Solid State Physics Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
| | - C. B. Basak
- Glass and Advanced Materials Division
- Bhabha Atomic Research Centre
- Mumbai-400085
- India
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28
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Bari R, Parviz D, Khabaz F, Klaassen CD, Metzler SD, Hansen MJ, Khare R, Green MJ. Liquid phase exfoliation and crumpling of inorganic nanosheets. Phys Chem Chem Phys 2015; 17:9383-93. [DOI: 10.1039/c5cp00294j] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Experiment and simulation demonstrate the polymer-assisted dispersion of inorganic 2D layered nanomaterials such as boron nitride nanosheets (BNNSs), MoS2 nanosheets, and WS2 nanosheets; spray drying can be used to alter such nanosheets into a crumpled morphology.
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Affiliation(s)
- Rozana Bari
- Department of Chemical Engineering
- Texas Tech University
- Lubbock
- USA
| | - Dorsa Parviz
- Artie McFerrin Department of Chemical Engineering
- Texas A&M University
- College Station
- USA
| | - Fardin Khabaz
- Department of Chemical Engineering
- Texas Tech University
- Lubbock
- USA
| | | | - Shane D. Metzler
- Department of Chemical Engineering
- Texas Tech University
- Lubbock
- USA
| | | | - Rajesh Khare
- Department of Chemical Engineering
- Texas Tech University
- Lubbock
- USA
| | - Micah J. Green
- Artie McFerrin Department of Chemical Engineering
- Texas A&M University
- College Station
- USA
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29
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Drying of a single droplet to investigate process–structure–function relationships: a review. ACTA ACUST UNITED AC 2014. [DOI: 10.1007/s13594-014-0186-1] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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30
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Giovagnoli S, Palazzo F, Michele AD, Schoubben A, Blasi P, Ricci M. The Influence of Feedstock and Process Variables on the Encapsulation of Drug Suspensions by Spray‐Drying in Fast Drying Regime: The Case of Novel Antitubercular Drug–Palladium Complex Containing Polymeric Microparticles. J Pharm Sci 2014; 103:1255-68. [DOI: 10.1002/jps.23902] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Sen D, Ghosh A, Mazumder S, Bindal R, Tewari P. Novel polysulfone–spray-dried silica composite membrane for water purification: Preparation, characterization and performance evaluation. Sep Purif Technol 2014. [DOI: 10.1016/j.seppur.2013.12.019] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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32
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Kim YK, Na HK, Ham S, Min DH. Mediating ordered assembly of gold nanorods by controlling droplet evaporation modes for surface enhanced Raman scattering. RSC Adv 2014. [DOI: 10.1039/c4ra07063a] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
The evaporation induced self-assembly of nanomaterials has emerged as one of the important approaches to fabricate various ordered nanostructures with enhanced optical properties.
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Affiliation(s)
- Young-Kwan Kim
- Center for RNA Research
- Institute for Basic Science
- Department of Chemistry
- Seoul National University
- Seoul, Republic of Korea
| | - Hee-Kyung Na
- Center for RNA Research
- Institute for Basic Science
- Department of Chemistry
- Seoul National University
- Seoul, Republic of Korea
| | - Seulbeom Ham
- Center for RNA Research
- Institute for Basic Science
- Department of Chemistry
- Seoul National University
- Seoul, Republic of Korea
| | - Dal-Hee Min
- Center for RNA Research
- Institute for Basic Science
- Department of Chemistry
- Seoul National University
- Seoul, Republic of Korea
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33
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Ashton DJ, Jack RL, Wilding NB. Self-assembly of colloidal polymers via depletion-mediated lock and key binding. SOFT MATTER 2013; 9:9661-9666. [PMID: 26029775 DOI: 10.1039/c3sm51839f] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We study the depletion-induced self-assembly of indented colloids. Using state-of-the-art Monte Carlo simulation techniques that treat the depletant particles explicitly, we demonstrate that colloids assemble by a lock-and-key mechanism, leading to colloidal polymerization. The morphology of the chains that are formed depends sensitively on the size of the colloidal indentation, with smaller values additionally permitting chain branching. In contrast to the case of spheres with attractive patches, Wertheim's thermodynamic perturbation theory fails to provide a fully quantitative description of the polymerization transition. We trace this failure to a neglect of packing effects and we introduce a modified theory that accounts better for the shape of the colloids, yielding improved agreement with simulation.
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Affiliation(s)
- Douglas J Ashton
- Department of Physics, University of Bath, Bath BA2 7AY, UK. E-mail:
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34
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Chen X, Jing X, Wang J, Liu J, Song D, Liu L. Self-assembly of ZnO nanoparticles into hollow microspheres via a facile solvothermal route and their application as gas sensor. CrystEngComm 2013. [DOI: 10.1039/c3ce40654g] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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35
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Bahadur J, Sen D, Mazumder S, Sastry PU, Paul B, Bhatt H, Singh SG. One-step fabrication of thermally stable TiO2/SiO2 nanocomposite microspheres by evaporation-induced self-assembly. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11343-11353. [PMID: 22794199 DOI: 10.1021/la3022886] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The evaporation-induced self-assembly of mixed colloids has been employed to synthesize microspheres of TiO(2)/SiO(2) nanocomposites. Small-angle neutron/X-ray scattering and scanning electron microscopy experiments reveal the hierarchical morphology of the microspheres. Although the internal structure of the microspheres, consisting of solely silica nanoparticles, gets significantly modified with time because of the reduction in the high specific surface area by internal coalescence, the same for the composite microspheres remains stable over an aging time of 1 year. Such temporal stability of the composite microspheres is attributed to the inhibition of coalescence of the silica nanoparticles in the presence of titania nanoparticles. X-ray diffraction and thermogravimetric results show the improved thermal stability of the composite grains against the anatase-to-rutile phase transition. Such thermal stability is attributed to the suppression of the growth of titania nanoparticles in the presence of silica nanoparticles. The UV-vis results indicate the confinement effect of the TiO(2) nanoparticles in the silica matrix. A plausible mechanism has been elucidated for the formation of microspheres with different morphology during self-assembly.
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Affiliation(s)
- J Bahadur
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
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Quilliet C. Numerical deflation of beach balls with various Poisson's ratios: from sphere to bowl's shape. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2012; 35:48. [PMID: 22706902 DOI: 10.1140/epje/i2012-12048-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 03/30/2012] [Accepted: 05/29/2012] [Indexed: 06/01/2023]
Abstract
We present a numerical study of the shape taken by a spherical elastic surface when the volume it encloses is decreased. For the range of 2D parameters where such a surface may model a thin shell of an isotropic elastic material, the mode of deformation that develops a single depression is investigated in detail. It occurs via buckling from sphere toward an axisymmetric dimple, followed by a second buckling where the depression loses its axisymmetry through folding along portions of meridians. For the thinnest shells, a direct transition from the spherical conformation to the folded one can be observed. We could exhibit unifying master curves for the relative volume variation at which first and second buckling occur, and clarify the role of Poisson's ratio. In the folded conformation, the number of folds and inner pressure are investigated, allowing us to infer shell features from mere observation and/or knowledge of external constraints.
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Affiliation(s)
- C Quilliet
- Université Grenoble/CNRS, LIPhy UMR5588, Grenoble, France.
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Cui L, Zhang J, Zhang X, Huang L, Wang Z, Li Y, Gao H, Zhu S, Wang T, Yang B. Suppression of the coffee ring effect by hydrosoluble polymer additives. ACS APPLIED MATERIALS & INTERFACES 2012; 4:2775-80. [PMID: 22545558 DOI: 10.1021/am300423p] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A simple and novel method has been demonstrated for avoiding coffee ring structure based on hydrosoluble polymer additives during droplet evaporation. The polymer additives lead to the motion of the contact line (CL) resulted from the viscosity and Marangoni effect. The viscosity provides a large resistance to the radially outward flow. It results in a small amount of spheres deposited at droplet edge, which do not facilitate the pinning of the CL. The Marangoni effect resulted from the variation of polymer concentration at droplet edge during droplet evaporation contributes to the motion of the CL. Thus, uniform and ordered macroscale SiO(2) microspheres deposition is achieved. What's more, the coffee ring effect can be eliminated by different hydrosoluble polymer. This method will be applicable to a wide of aqueous system and will be of great significance for extensive applications of droplet deposition in biochemical assays and material deposition.
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Affiliation(s)
- Liying Cui
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, PR China
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