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Li Y, Li J, Cai Z, Sun Y, Jiang H, Guan X, Ngai T. One-Step Formation of Pickering Double Emulsion Costabilized by Hydrophobic Silica Nanoparticles and Sodium Alginate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:13903-13911. [PMID: 38920295 PMCID: PMC11238577 DOI: 10.1021/acs.langmuir.4c00976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2024] [Revised: 06/10/2024] [Accepted: 06/12/2024] [Indexed: 06/27/2024]
Abstract
Pickering double emulsions exhibit higher stability and biocompatibility compared with surfactant-stabilized double emulsions. However, tailored synthesis of particle stabilizers with appropriate wettability is time consuming and complicated and usually limits their large-scale adoption. Using binary stabilizers may be a simple and scalable strategy for Pickering double emulsion formation. Herein, commercially available hydrophobic silica nanoparticles (SNPs) and sodium alginate (SA) as binary stabilizers are used to prepare O/W/O Pickering double emulsions in one-step emulsification. The influence of system composition on double emulsion preparation is identified by optical microscopy, confocal laser scanning microscopy, and interfacial tension and water contact angle analyses. The formation of the O/W/O Pickering double emulsion depends critically on the aqueous phase viscosity and occurrence of emulsion inversion. Both hydrophobic SNPs and SA adsorb at the droplet surface to provide a steric barrier, while SA also reduces interfacial tension and increases aqueous phase viscosity, giving double emulsion long-term stability. Their microstructure and stability are controlled by adjusting the SA concentration, water-oil volume ratio, concentration and wettability of the particle stabilizer, and oil type. As a demonstration, the middle layer of the as-prepared O/W/O Pickering double emulsions can be cross-linked in situ with calcium ions to produce calcium alginate porous microspheres. We believe that our strategy for double emulsion formation holds great potential for practical applications in food, cosmetics, or pharmaceuticals.
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Affiliation(s)
- Yunxing Li
- Key
Laboratory of Synthetic and Biological Colloids, Ministry of Education,
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P.R. China
| | - Jiaming Li
- Key
Laboratory of Synthetic and Biological Colloids, Ministry of Education,
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P.R. China
| | - Zhiqing Cai
- Key
Laboratory of Synthetic and Biological Colloids, Ministry of Education,
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P.R. China
| | - Yajuan Sun
- Key
Laboratory of Synthetic and Biological Colloids, Ministry of Education,
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P.R. China
| | - Hang Jiang
- Key
Laboratory of Synthetic and Biological Colloids, Ministry of Education,
School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, P.R. China
| | - Xin Guan
- Department
of Chemistry, The Chinese University of
Hong Kong, Shatin, N. T., Hong Kong, P.R. China
| | - To Ngai
- Department
of Chemistry, The Chinese University of
Hong Kong, Shatin, N. T., Hong Kong, P.R. China
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2
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Kumar H, Tiwari M, Dugyala VR, Basavaraj MG. Single-Step Formation of Pickering Double Emulsions by Exploiting Differential Wettability of Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:7860-7870. [PMID: 38557075 DOI: 10.1021/acs.langmuir.3c03374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
We present a modular single-step strategy for the formation of single and Pickering double emulsions (DEs). To this end, we consider the role of surface modification of particles and their dispersibility in different phases in the context of the design of Pickering emulsions by varying the volume fraction of oil in the oil-water mixture (ϕoil) used for emulsification. In particular, the experiments are performed by considering (a) model spherical and nonspherical colloids of different wettabilities which are tailored by oleic acid treatment, (b) immiscible liquids with or without particles, and (c) varying ϕoil from 0.1 to 0.9. We show that it is possible to affect a transition from (i) oil-in-water (O/W) emulsion to water-in-oil (W/O) emulsion and (ii) oil-in-water (O/W) to oil-in-water-in-oil (O/W/O) to water-in-oil (W/O) as ϕoil is systematically varied. We elucidate that the range of ϕoil at which particle stabilized DEs of the O/W/O type form can be tuned by engineering surface modification of particles to different extents. Furthermore, the arrangement of particles on the surface of droplets in the Pickering DEs is discussed. Our results conclusively establish that the differential wettability of particles is the key for the design of Pickering DEs. The versatility of the proposed strategy is established by developing DEs using a number of model colloidal systems.
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Affiliation(s)
- Hemant Kumar
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
| | - Madhvi Tiwari
- Department of Chemical Engineering, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Venkateshwar Rao Dugyala
- Department of Chemical Engineering, Indian Institute of Science Education and Research Bhopal, Bhopal, Madhya Pradesh 462066, India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science (PECS) Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India
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3
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Jiang L, Guo K, Chen Y, Xiang N. Droplet Microfluidics for Current Cancer Research: From Single-Cell Analysis to 3D Cell Culture. ACS Biomater Sci Eng 2024; 10:1335-1354. [PMID: 38420753 DOI: 10.1021/acsbiomaterials.3c01866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Cancer is the second leading cause of death worldwide. Differences in drug resistance and treatment response caused by the heterogeneity of cancer cells are the primary reasons for poor cancer therapy outcomes in patients. In addition, current in vitro anticancer drug-screening methods rely on two-dimensional monolayer-cultured cancer cells, which cannot accurately predict drug behavior in vivo. Therefore, a powerful tool to study the heterogeneity of cancer cells and produce effective in vitro tumor models is warranted to leverage cancer research. Droplet microfluidics has become a powerful platform for the single-cell analysis of cancer cells and three-dimensional cell culture of in vitro tumor spheroids. In this review, we discuss the use of droplet microfluidics in cancer research. Droplet microfluidic technologies, including single- or double-emulsion droplet generation and passive- or active-droplet manipulation, are concisely discussed. Recent advances in droplet microfluidics for single-cell analysis of cancer cells, circulating tumor cells, and scaffold-free/based 3D cell culture of tumor spheroids have been systematically introduced. Finally, the challenges that must be overcome for the further application of droplet microfluidics in cancer research are discussed.
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Affiliation(s)
- Lin Jiang
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
| | - Kefan Guo
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
| | - Yao Chen
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
| | - Nan Xiang
- School of Mechanical Engineering, and Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, Southeast University, Nanjing 211189, China
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4
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Chen Q, Zheng J. Self-assembly and structures of nanoscale double emulsion droplets through coarse-grained molecular dynamics simulations. SOFT MATTER 2023; 19:7731-7743. [PMID: 37789812 DOI: 10.1039/d3sm00656e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Examples of self-assembled multiple emulsion droplets on the nanometre scale are very rare. In this work, we use coarse-grained (CG) molecular dynamics simulations to study the self-assembly of ternary mixtures consisting of water, n-heptane, and nonionic surfactant tetraethylene glycol monododecyl ether (C12E4). The water volume fractions studied are 1%, 3%, and 5%, respectively. Various nanoscale emulsions are obtained in a spontaneous process. When the water/surfactant volume ratio vm/s = 1.0/1.0, the obtained emulsion droplets are identified as oil-in-water-in-oil (O/W/O) double types, consisting of an oil core, an inner surfactant layer, a water layer, and an outer surfactant layer. The water molecules are distributed around the hydrophilic ends of the surfactants, while the hydrophobic ends of the surfactants wrap the oil cores and penetrate into the oil bulk. Hydrogen-bond interactions among water and the hydrophilic ends of the surfactants form cross-links that stabilize the double emulsion droplets. The sizes of all the oil cores inside the droplets are <6 nm in diameter, even with the highest water volume fraction of 5%. Both the concentration of free water molecules on the order of 10-6 mol/cm3 and the favourable energy change during emulsion formation indicate that the emulsion droplets are thermodynamically stable. In contrast, for vm/s = 1.0/5.5, no double emulsion but a simple water-in-oil emulsion was observed, with morphologies evolving from oblate to bicontinuous phases with an increase in the water volume fraction from 1% to 5%. Our coarse-grained molecular dynamics simulations provide valuable insight for the preparation of nanoscale double emulsions and the characterization of their structures.
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Affiliation(s)
- Qiubo Chen
- Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore.
| | - Jianwei Zheng
- Institute of High Performance Computing (IHPC), Agency for Science, Technology and Research (A*STAR), 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632, Republic of Singapore.
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5
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Farooqi ZH, Vladisavljević GT, Pamme N, Fatima A, Begum R, Irfan A, Chen M. Microfluidic Fabrication and Applications of Microgels and Hybrid Microgels. Crit Rev Anal Chem 2023:1-15. [PMID: 36757081 DOI: 10.1080/10408347.2023.2177097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Smart microgels have gained much attention because of their wide range of applications in the field of biomedical, environmental, nanotechnological and catalysis sciences. Most of the applications of microgels are strongly affected by their morphology, size and size distribution. Various methodologies have been adopted to obtain polymer microgel particles. Droplet microfluidic techniques have been widely reported for the fabrication of highly monodisperse microgel particles to be used for various applications. Monodisperse microgel particles of required size and morphology can be achieved via droplet microfluidic techniques by simple polymerization of monomers in the presence of suitable crosslinker or by gelation of high molecular weight polymers. This report gives recent research progress in fabrication, characterization, properties and applications of microgel particles synthesized by microfluidic methods.
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Affiliation(s)
- Zahoor H Farooqi
- School of Chemistry, University of the Punjab, New Campus, Lahore, Pakistan
- Department of Chemical Engineering, Loughborough University, Loughborough, UK
| | | | - Nicole Pamme
- Department for Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
- Department of Chemistry and Biochemistry, University of Hull, Hull, United Kingdom
| | - Arooj Fatima
- School of Chemistry, University of the Punjab, New Campus, Lahore, Pakistan
| | - Robina Begum
- School of Chemistry, University of the Punjab, New Campus, Lahore, Pakistan
| | - Ahmad Irfan
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, Abha, Saudi Arabia
- Department of Chemistry, College of Science, King Khalid University, Abha, Saudi Arabia
| | - Minjun Chen
- Department of Chemical Engineering, Loughborough University, Loughborough, UK
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6
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Wang W, Li PF, Xie R, Ju XJ, Liu Z, Chu LY. Designable Micro-/Nano-Structured Smart Polymeric Materials. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107877. [PMID: 34897843 DOI: 10.1002/adma.202107877] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/01/2021] [Revised: 11/28/2021] [Indexed: 06/14/2023]
Abstract
Smart polymeric materials with dynamically tunable physico-chemical characteristics in response to changes of environmental stimuli, have received considerable attention in myriad fields. The diverse combination of their micro-/nano-structural and molecular designs creates promising and exciting opportunities for exploiting advanced smart polymeric materials. Engineering micro-/nano-structures into smart polymeric materials with elaborate molecular design enables intricate coordination between their structures and molecular-level response to cooperatively realize smart functions for practical applications. In this review, recent progresses of smart polymeric materials that combine micro-/nano-structures and molecular design to achieve designed advanced functions are highlighted. Smart hydrogels, gating membranes, gratings, milli-particles, micro-particles and microvalves are employed as typical examples to introduce their design and fabrication strategies. Meanwhile, the key roles of interplay between their micro-/nano-structures and responsive properties to realize the desired functions for their applications are emphasized. Finally, perspectives on the current challenges and opportunities of micro-/nano-structured smart polymeric materials for their future development are presented.
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Affiliation(s)
- Wei Wang
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Ping-Fan Li
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Rui Xie
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Xiao-Jie Ju
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Zhuang Liu
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
| | - Liang-Yin Chu
- School of Chemical Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
- State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu, Sichuan, 610065, China
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7
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Hema S, Karmakar A, Das RK, Srivastava P. Simple formulation and characterization of double emulsion variant designed to carry three bioactive agents. Heliyon 2022; 8:e10397. [PMID: 36097481 PMCID: PMC9463587 DOI: 10.1016/j.heliyon.2022.e10397] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 07/22/2022] [Accepted: 08/17/2022] [Indexed: 11/29/2022] Open
Abstract
Multiple emulsions are thermodynamically stable systems that mark applications in various fields including drug delivery systems. They allow enhanced availability of drugs, greater absorption, and present reduced toxicity, among other desirable properties. In this work, we aimed to formulate a unique double emulsion (O1/W + W1/O2/W/W) with three bioactive components viz. Ocimum tenuiflorum oil, Cocos nucifera oil and crystalline Cinnamomum camphora. Three surfactants with different HLB values viz. Tween-20, Tween-80 and Triton X-100 were used for the emulsification process. The method followed was simple as compared to current methods employed for formulating multiple emulsions. Formulation was characterized using techniques of bright field microscopy, Dynamic Light Scattering (DLS), High-Resolution Transmission Electron Microscopy (HR-TEM) and Fourier-transform infrared spectroscopy (FTIR). Image processing tools were also used to characterize the formulation, which reliably cross-verified the observations from conventional characterization techniques. The potency of individual components of emulsion was compared with the prepared double emulsion model by testing the activity on two pathologically relevant bacterial strains: Fusobacterium nucleatum (FN) and Porphyromonas gingivalis (PG).
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Affiliation(s)
- S.K. Hema
- School of Bio Sciences and Technology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Aparajita Karmakar
- Centre for Biomaterials and Molecular Theranostics, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Raunak Kumar Das
- Centre for Biomaterials and Molecular Theranostics, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
| | - Priyanka Srivastava
- Centre for Nanobiotechnology, Vellore Institute of Technology, Vellore 632014, Tamil Nadu, India
- Corresponding author.
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8
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Anisotropic droplets with uniform internal structure prepared in batch-scale by combination of vortex mixing and phase separation. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Tenorio-Garcia E, Araiza-Calahorra A, Simone E, Sarkar A. Recent advances in design and stability of double emulsions: Trends in Pickering stabilization. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107601] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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10
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Calhoun SGK, Brower KK, Suja VC, Kim G, Wang N, McCully AL, Kusumaatmaja H, Fuller GG, Fordyce PM. Systematic characterization of effect of flow rates and buffer compositions on double emulsion droplet volumes and stability. LAB ON A CHIP 2022; 22:2315-2330. [PMID: 35593127 PMCID: PMC9195911 DOI: 10.1039/d2lc00229a] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/11/2022] [Accepted: 05/03/2022] [Indexed: 06/15/2023]
Abstract
Double emulsion droplets (DEs) are water/oil/water droplets that can be sorted via fluorescence-activated cell sorting (FACS), allowing for new opportunities in high-throughput cellular analysis, enzymatic screening, and synthetic biology. These applications require stable, uniform droplets with predictable microreactor volumes. However, predicting DE droplet size, shell thickness, and stability as a function of flow rate has remained challenging for monodisperse single core droplets and those containing biologically-relevant buffers, which influence bulk and interfacial properties. As a result, developing novel DE-based bioassays has typically required extensive initial optimization of flow rates to find conditions that produce stable droplets of the desired size and shell thickness. To address this challenge, we conducted systematic size parameterization quantifying how differences in flow rates and buffer properties (viscosity and interfacial tension at water/oil interfaces) alter droplet size and stability, across 6 inner aqueous buffers used across applications such as cellular lysis, microbial growth, and drug delivery, quantifying the size and shell thickness of >22 000 droplets overall. We restricted our study to stable single core droplets generated in a 2-step dripping-dripping formation regime in a straightforward PDMS device. Using data from 138 unique conditions (flow rates and buffer composition), we also demonstrated that a recent physically-derived size law of Wang et al. can accurately predict double emulsion shell thickness for >95% of observations. Finally, we validated the utility of this size law by using it to accurately predict droplet sizes for a novel bioassay that requires encapsulating growth media for bacteria in droplets. This work has the potential to enable new screening-based biological applications by simplifying novel DE bioassay development.
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Affiliation(s)
- Suzanne G K Calhoun
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Kara K Brower
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
- ChEM-H Institute, Stanford University, Stanford, CA 94305, USA
| | - Vineeth Chandran Suja
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
- School of Engineering and Applied Sciences, Harvard University, MA - 01234, USA
| | - Gaeun Kim
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
| | - Ningning Wang
- School of Energy & Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China
| | - Alexandra L McCully
- Department of Civil & Environmental Engineering, Stanford University, Stanford, CA 94305, USA
| | | | - Gerald G Fuller
- Department of Chemical Engineering, Stanford University, Stanford, CA 94305, USA
| | - Polly M Fordyce
- Department of Bioengineering, Stanford University, Stanford, CA 94305, USA.
- ChEM-H Institute, Stanford University, Stanford, CA 94305, USA
- Department of Genetics, Stanford University, Stanford, CA 94305, USA
- Chan Zuckerberg BioHub, San Francisco, CA 94158, USA
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11
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Dhandhi Y, Chaudhari RK, Naiya TK. Development in separation of oilfield emulsion toward green technology – A comprehensive review. SEP SCI TECHNOL 2021. [DOI: 10.1080/01496395.2021.1995427] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Yogesh Dhandhi
- Department of Petroleum Engineering, Indian Institute of Technology (ISM), Dhanbad, India
| | - Ronak Kumar Chaudhari
- Department of Petroleum Engineering, Indian Institute of Technology (ISM), Dhanbad, India
| | - Tarun Kumar Naiya
- Department of Petroleum Engineering, Indian Institute of Technology (ISM), Dhanbad, India
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12
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Yang S, Qin W, He F, Zhao X, Zhou Q, Lin F, Gong H, Zhang S, Yu G, Feng Y, Li J. Tuning Supramolecular Polymers' Amphiphilicity via Host-Guest Interfacial Recognition for Stabilizing Multiple Pickering Emulsions. ACS APPLIED MATERIALS & INTERFACES 2021; 13:51661-51672. [PMID: 34696581 DOI: 10.1021/acsami.1c13715] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Supramolecular host-guest chemistry bridging the adjustable amphiphilicity and macromolecular self-assembly is well advanced in aqueous media. However, the interfacial self-assembled behaviors have not been further exploited. Herein, we designed a β-cyclodextrin-grafted alginate/azobenzene-functionalized dodecyl (Alg-β-CD/AzoC12) supra-amphiphilic system that possessed tunable amphiphilicity by host-guest interfacial self-assembly. Especially, supra-amphiphilic aggregates could be utilized as highly efficient soft colloidal emulsifiers for stabilizing water-in-oil-water (W/O/W) Pickering emulsions due to the excellent interfacial activity. Meanwhile, the assembled particle structures could be modulated by adjusting the oil-water ratio, resulting from the tunable aggregation behavior of supra-amphiphilic macromolecules. Additionally, the interfacial adsorption films could be partially destroyed/reconstructed upon ultraviolet/visible irradiation due to the stimuli-altering balance of amphiphilicity of Alg-β-CD/AzoC12 polymers, further constructing the stimulus-responsive Pickering emulsions. Therefore, the supramolecular interfacial self-assembly-mediated approach not only technologically advances the continued development of creative templates to construct multifunctional soft materials with anisotropic structures but also serves as a creative bridge between supramolecular host-guest chemistry, colloidal interface science, and soft material technology.
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Affiliation(s)
- Shujuan Yang
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Wenqi Qin
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Furui He
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Xinyu Zhao
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Qichang Zhou
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Feilin Lin
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Houkui Gong
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Siqi Zhang
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Gaobo Yu
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Yuhong Feng
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
| | - Jiacheng Li
- Key Laboratory of Advanced Materials of Tropical Island Resources, Ministry of Education, College of Chemical Engineering and Technology, Hainan University, 58 Renmin Road, Haikou 570228, Hainan, China
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13
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Kramer S, Krajnc P. Hierarchically Porous Microspheres by Thiol-ene Photopolymerization of High Internal Phase Emulsions-in-Water Colloidal Systems. Polymers (Basel) 2021; 13:3366. [PMID: 34641179 PMCID: PMC8512400 DOI: 10.3390/polym13193366] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 09/27/2021] [Accepted: 09/27/2021] [Indexed: 01/10/2023] Open
Abstract
A facile method for the preparation of hierarchically porous spherical particles using high internal phase water-in-oil-in-water (w/o/w) double emulsions via the photopolymerization of the water-in-oil high internal phase emulsion (w/o HIPE) was developed. Visible-light photopolymerization was used for the synthesis of microspherical particles. The HIP emulsion had an internal phase volume of 80% and an oil phase containing either thiol pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) or trimethylolpropane tris(3-mercaptopropionate) (TMPTMP) and acrylate trimethylolpropane triacrylate (TMPTA). This enabled the preparation of microspheres with an open porous morphology, on both the surface and within the microsphere, with high yields in a batch manner. The effect of the thiol-to-acrylate ratio on the microsphere diameter, pore and window diameter, and degradation was investigated. It is shown that thiol has a minor effect on the microsphere and pore diameter, while the acrylate ratio affects the degradation speed, which decreases with increasing acrylate content. The possibility of free thiol group functionalization was demonstrated by a reaction with allylamine, while the microsphere adsorption capabilities were tested by the adsorption of methylene blue.
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Affiliation(s)
| | - Peter Krajnc
- PolyOrgLab, Faculty of Chemistry and Chemical Engineering, University of Maribor, Smetanova 17, 2000 Maribor, Slovenia;
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14
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Zhang WJ, Yan YZ, Nagappan S, He S, Ha CS, Jin YS. Dual (thermo-/pH-) responsive P(NIPAM-co-AA-co-HEMA) nanocapsules for controlled release of 5-fluorouracil. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2021. [DOI: 10.1080/10601325.2021.1964368] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Wei-Jin Zhang
- Beijing Key Laboratory of Special Elastomer Composites, School of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing, P. R. China
- Department of Polymer Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, Republic of Korea
- Department of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, P. R. China
| | - Yong-Zhu Yan
- Department of Polymer Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, Republic of Korea
| | - Saravanan Nagappan
- Department of Polymer Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, Republic of Korea
| | - Shanshan He
- Engineering/Precision Manufacturing Systems Division, School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea
| | - Chang-Sik Ha
- Department of Polymer Science and Engineering, School of Chemical Engineering, Pusan National University, Busan, Republic of Korea
| | - Yu-Shun Jin
- Beijing Key Laboratory of Special Elastomer Composites, School of Materials Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing, P. R. China
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15
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Preparation of cellulose microparticles having hierarchical internal structures from multiple emulsion templates. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126718] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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16
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Tuning morphology of Pickering emulsions stabilised by biodegradable PLGA nanoparticles: How PLGA characteristics influence emulsion properties. J Colloid Interface Sci 2021; 595:202-211. [PMID: 33823323 DOI: 10.1016/j.jcis.2021.03.061] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 03/05/2021] [Accepted: 03/11/2021] [Indexed: 11/20/2022]
Abstract
In this study, we proved that the stabilisation of Pickering emulsions by polymer nanoparticles (NPs) heavily depends on polymer characteristics. We prepared NPs with four poly(lactide-co-glycolide) polymers (PLGA), of different molar masses (14,000 and 32,000 g/mol) and end groups (acid or alkylester). NPs were either bare (without stabilising polymer) or covered by polyvinyl alcohol (PVA). Pickering emulsions were prepared by mixing NP aqueous suspensions with various amounts of oil (Miglyol 812 N). First, NP wettability was directly affected by PLGA end group: ester-ending PLGA led to more hydrophobic NPs, compared to acid-ending PLGA. This effect of the end group could be slightly enhanced with smaller molar mass. Thus, bare PLGA NPs stabilised different types of emulsions (W/O/W and W/O), following Finkle's rule. However, the effect of PLGA characteristics was masked when NPs were covered by PVA, as PVA drove the stabilisation of O/W emulsions. Secondly, PLGA molar mass and end group also influenced its glass transition temperature (Tg), with spectacular consequences on emulsion formation. Indeed, the shortest ester-ending PLGA exhibited a Tg close to room temperature, when measured in the emulsion. This Tg, easily exceeded during emulsification process, led to a soft solid emulsion, stabilised by a network of NP debris.
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Ravera F, Dziza K, Santini E, Cristofolini L, Liggieri L. Emulsification and emulsion stability: The role of the interfacial properties. Adv Colloid Interface Sci 2021; 288:102344. [PMID: 33359938 DOI: 10.1016/j.cis.2020.102344] [Citation(s) in RCA: 97] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 12/10/2020] [Accepted: 12/10/2020] [Indexed: 02/06/2023]
Abstract
In this review, we highlight and discuss the effects of interfacial properties on the major mechanisms governing the aging of emulsions: flocculation, coalescence and Ostwald ripening. The process of emulsification is also addressed, as it is well recognized that the adsorption properties of emulsifiers play an important role on it. The consolidated background on these phenomena is briefly summarised based on selected literature, reporting relevant findings and results, and discussing some criticalities. The typical experimental approaches adopted to investigate the above effects are also summarised, underlining in particular the role of adsorption at the droplet interface. Attention is paid to different types of surface-active species involved with emulsion production, including solid particles. The latter being of increasing interest in a wide variety of emulsions-related products and technologies in various fields. The possibility to stop the long term aging caused by Ostwald ripening in emulsions is also discussed, quantifying under which conditions it may occur in practice.
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18
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Balaj RV, Zarzar LD. Reconfigurable complex emulsions: Design, properties, and applications. ACTA ACUST UNITED AC 2020. [DOI: 10.1063/5.0028606] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Rebecca V. Balaj
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
| | - Lauren D. Zarzar
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
- Department of Materials Science and Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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19
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Calvo F, Gómez JM, Ricardez-Sandoval L, Alvarez O. Integrated design of emulsified cosmetic products: A review. Chem Eng Res Des 2020. [DOI: 10.1016/j.cherd.2020.07.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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20
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Wu B, Yang C, Li B, Feng L, Hai M, Zhao CX, Chen D, Liu K, Weitz DA. Active Encapsulation in Biocompatible Nanocapsules. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2002716. [PMID: 32578400 DOI: 10.1002/smll.202002716] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 05/17/2020] [Indexed: 06/11/2023]
Abstract
Co-precipitation is generally refers to the co-precipitation of two solids and is widely used to prepare active-loaded nanoparticles. Here, it is demonstrated that liquid and solid can precipitate simultaneously to produce hierarchical core-shell nanocapsules that encapsulate an oil core in a polymer shell. During the co-precipitation process, the polymer preferentially deposits at the oil/water interface, wetting both the oil and water phases; the behavior is determined by the spreading coefficients and driven by the energy minimization. The technique is applicable to directly encapsulate various oil actives and avoid the use of toxic solvent or surfactant during the preparation process. The obtained core-shell nanocapsules harness the advantage of biocompatibility, precise control over the shell thickness, high loading capacity, high encapsulation efficiency, good dispersity in water, and improved stability against oxidation. The applications of the nanocapsules as delivery vehicles are demonstrated by the excellent performances of natural colorant and anti-cancer drug-loaded nanocapsules. The core-shell nanocapsules with a controlled hierarchical structure are, therefore, ideal carriers for practical applications in food, cosmetics, and drug delivery.
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Affiliation(s)
- Baiheng Wu
- Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Zheda Road No. 38, Hangzhou, 310027, China
- State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Zheda Road No. 38, Hangzhou, 310027, China
| | - Chenjing Yang
- Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Zheda Road No. 38, Hangzhou, 310027, China
| | - Bo Li
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
| | - Leyun Feng
- Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Zheda Road No. 38, Hangzhou, 310027, China
| | - Mingtan Hai
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Chun-Xia Zhao
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Dong Chen
- Institute of Process Equipment, College of Energy Engineering, Zhejiang University, Zheda Road No. 38, Hangzhou, 310027, China
- State Key Laboratory of Fluid Power and Mechatronic Systems, Zhejiang University, Zheda Road No. 38, Hangzhou, 310027, China
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Kai Liu
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - David A Weitz
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
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21
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Filipczak N, Pan J, Yalamarty SSK, Torchilin VP. Recent advancements in liposome technology. Adv Drug Deliv Rev 2020; 156:4-22. [PMID: 32593642 DOI: 10.1016/j.addr.2020.06.022] [Citation(s) in RCA: 257] [Impact Index Per Article: 64.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 06/16/2020] [Accepted: 06/21/2020] [Indexed: 12/22/2022]
Abstract
The liposomes have continued to be well-recognized as an important nano-sized drug delivery system with attractive properties, such a characteristic bilayer structure assembling the cellular membrane, easy-to-prepare and high bio-compatibility. Extensive effort has been devoted to the development of liposome-based drug delivery systems during the past few decades. Many drug candidates have been encapsulated in liposomes and investigated for reduced toxicity and extended duration of therapeutic effect. The liposomal encapsulation of hydrophilic and hydrophobic small molecule therapeutics as well as other large molecule biologics have been established among different academic and industrial research groups. To date, there has been an increasing number of FDA-approved liposomal-based therapeutics together with more and more undergoing clinical trials, which involve a wide range of applications in anticancer, antibacterial, and antiviral therapies. In order to meet the continuing demand for new drugs in clinics, more recent advancements have been investigated for optimizing liposomal-based drug delivery system with more reproducible preparation technique and a broadened application to novel modalities, including nucleic acid therapies, CRISPR/Cas9 therapies and immunotherapies. This review focuses on the recent liposome' preparation techniques, the excipients of liposomal formulations used in various novel studies and the routes of administration used to deliver liposomes to targeted areas of disease. It aims to update the research in liposomal delivery and highlights future nanotechnological approaches.
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22
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Björkegren S, Freixiela Dias MCA, Lundahl K, Nordstierna L, Palmqvist A. Phase Inversions Observed in Thermoresponsive Pickering Emulsions Stabilized by Surface Functionalized Colloidal Silica. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2357-2367. [PMID: 32075376 DOI: 10.1021/acs.langmuir.9b03648] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
In this study, the emulsification performance of functionalized colloidal silica is explored with the aim to achieve phase inversion of particle-stabilized (Pickering) emulsion systems. An increased understanding of inversion conditions can facilitate surfactant-free emulsion fabrication and expand its use in industrial applications. Phase inversion was achieved by adjusting the temperature but without changing the composition of the emulsion formulation. Silica nanoparticles modified with hydrophobic propyl groups and hydrophilic methyl poly(ethylene)glycol (mPEG) groups are used as emulsifiers, enabling control of the wettability of the particles and exploration of phase inversion phenomena, the latter due to the thermoresponsiveness of the attached PEG chains. The phase inversion conditions as well as the reversibility of the emulsion systems were examined at varying electrolyte concentrations and pH values of the suspensions. Transitional phase inversions, from oil-in-water and water-in-oil and back, were observed in functionalized silica particle-stabilized butanol emulsions at distinct temperatures. The phase inversion temperature was affected by electrolyte concentration and pH conditions due to salting-out effects, PEG-silica interactions, and the effects of the particle surface charge. Investigations of phase inversion conditions, temperature, and hysteresis effects in Pickering emulsions can improve the theoretical understanding of these phenomena and facilitate the implementation of low-energy emulsion preparation.
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Affiliation(s)
- Sanna Björkegren
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
- Nouryon Pulp and Performance Chemicals AB, SE-445 80 Bohus, Sweden
| | | | - Kristina Lundahl
- Nouryon Pulp and Performance Chemicals AB, SE-445 80 Bohus, Sweden
| | - Lars Nordstierna
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
| | - Anders Palmqvist
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
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23
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Sun Z, Yang C, Eggersdorfer M, Cui J, Li Y, Hai M, Chen D, Weitz DA. A general strategy for one-step fabrication of biocompatible microcapsules with controlled active release. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2019.04.040] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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24
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Overview on petroleum emulsions, formation, influence and demulsification treatment techniques. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.11.014] [Citation(s) in RCA: 90] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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26
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Ong ILH, Amstad E. Selectively Permeable Double Emulsions. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1903054. [PMID: 31517446 DOI: 10.1002/smll.201903054] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Revised: 08/12/2019] [Indexed: 06/10/2023]
Abstract
Natural organisms are made of different types of microcompartments, many of which are enclosed by cell membranes. For these organisms to display a proper function, the microcompartments must be selectively permeable. For example, cell membranes are typically permeable toward small, uncharged molecules such as water, selected nutrients, and cell signaling molecules, but impermeable toward many larger biomolecules. Here, it is reported for the first time dynamic compartments, namely surfactant-stabilized double emulsions, that display selective and tunable permeability. Selective permeability is imparted to double emulsions by stabilizing them with catechol-functionalized surfactants that transport molecules across the oil shell of double emulsions only if they electrostatically or hydrophobically attract encapsulants. These double emulsions are employed as semipermeable picoliter-sized vessels to controllably perform complexation reactions inside picoliter-sized aqueous cores. This thus far unmet level of control over the transport of reagents across oil phases opens up new possibilities to use double emulsion drops as dynamic and selectively permeable microcompartments to initiate and maintain chemical and biochemical reactions in picoliter-sized cell-mimetic compartments.
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Affiliation(s)
- Irvine Lian Hao Ong
- Soft Materials Laboratory, Institute of Materials, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Esther Amstad
- Soft Materials Laboratory, Institute of Materials, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
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27
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Yoon DH, Nozaki Y, Tanaka D, Sekiguchi T, Shoji S. Integration of Horizontal and Vertical Microfluidic Modules for Core-Shell Droplet Generation and Chemical Application. MICROMACHINES 2019; 10:E613. [PMID: 31540177 PMCID: PMC6780611 DOI: 10.3390/mi10090613] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 09/13/2019] [Accepted: 09/13/2019] [Indexed: 12/25/2022]
Abstract
This paper presents a method for utilizing three-dimensional microfluidic channels fully to realize multiple functions in a single device. The final device structure was achieved by combining three independent modules that consisted of horizontal and vertical channels. The device allowed for the one-step generation of water-in-oil-in-water droplets without the need for partial treatment of the polydimethylsiloxane channel surface using separate modules for generating water-in-oil droplets on the horizontal plane and oil-in-water droplets on the vertical plane. The second vertically structured module provided an efficient flow for the generation of highly wettable liquid droplets, and tuning of the first horizontally structured module enabled different modes of inner-core encapsulation within the oil shell. The successful integration of the vertical and horizontal channels for core-shell droplet generation and the chemical synthesis of a metal complex within the droplets were evaluated. The proposed approach of integrating independent modules will expand and enhance the functions of microfluidic platforms.
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Affiliation(s)
- Dong Hyun Yoon
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Yoshito Nozaki
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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28
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Xia Y, Na X, Wu J, Ma G. The Horizon of the Emulsion Particulate Strategy: Engineering Hollow Particles for Biomedical Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1801159. [PMID: 30260511 DOI: 10.1002/adma.201801159] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 07/06/2018] [Indexed: 05/13/2023]
Abstract
With their hierarchical structures and the substantial surface areas, hollow particles have gained immense research interest in biomedical applications. For scalable fabrications, emulsion-based approaches have emerged as facile and versatile strategies. Here, the recent achievements in this field are unfolded via an "emulsion particulate strategy," which addresses the inherent relationship between the process control and the bioactive structures. As such, the interior architectures are manipulated by harnessing the intermediate state during the emulsion revolution (intrinsic strategy), whereas the external structures are dictated by tailoring the building blocks and solidification procedures of the Pickering emulsion (extrinsic strategy). Through integration of the intrinsic and extrinsic emulsion particulate strategy, multifunctional hollow particles demonstrate marked momentum for label-free multiplex detections, stimuli-responsive therapies, and stem cell therapies.
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Affiliation(s)
- Yufei Xia
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Xiangming Na
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Jie Wu
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Guanghui Ma
- State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- PLA Key Laboratory of Biopharmaceutical Production & Formulation Engineering Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing, 211816, P. R. China
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29
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Emulsification of non-aqueous foams stabilized by fat crystals: Towards novel air-in-oil-in-water food colloids. Food Chem 2019; 293:49-56. [DOI: 10.1016/j.foodchem.2019.04.080] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 04/16/2019] [Accepted: 04/23/2019] [Indexed: 11/17/2022]
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30
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Fabrication of short peptide cages by interfacial self-assembly on CaCO3 templates. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.048] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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31
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Rezvantalab S, Keshavarz Moraveji M. Microfluidic assisted synthesis of PLGA drug delivery systems. RSC Adv 2019; 9:2055-2072. [PMID: 35516107 PMCID: PMC9059828 DOI: 10.1039/c8ra08972h] [Citation(s) in RCA: 63] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 12/16/2018] [Indexed: 12/28/2022] Open
Abstract
Poly(lactic-co-glycolic acid) (PLGA) is a biocompatible and biodegradable polymer that recently attracted attention for use as part of drug delivery systems (DDS). In this context, there is an emerging need for a rapid, reliable and reproducible method of synthesis. Here, microfluidic systems provide great opportunities for synthesizing carriers in a tightly controlled manner and with low consumption of materials, energy and time. These miniature devices have been the focus of recent research since they can address the challenges inherent to the bulk system, e.g. low drug loading efficiency and encapsulation, broad size distribution and burst initial release. In this article, we provide an overview of current microfluidic systems used in drug delivery production, with a special focus on PLGA-based DDS. In this context, we highlight the advantages associated with the use of microchip systems in the fabrication of nanoparticles (NPs) and microparticles (MPs), e.g. in achieving complex morphologies. Furthermore, we discuss the challenges for selecting proper microfluidics for targeted DDS production in a translational setting and introduce strategies that are used to overcome microfluidics shortcomings, like low throughput for production. Poly(lactic-co-glycolic acid) (PLGA) is a biocompatible and biodegradable polymer that recently attracted attention for use as part of drug delivery systems (DDS).![]()
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Affiliation(s)
- Sima Rezvantalab
- Department of Chemical Engineering
- Amirkabir University of Technology (Tehran Polytechnic)
- Tehran
- Iran
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32
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Yoon DH, Tanaka D, Sekiguchi T, Shoji S. Structural Formation of Oil-in-Water (O/W) and Water-in-Oil-in-Water (W/O/W) Droplets in PDMS Device Using Protrusion Channel without Hydrophilic Surface Treatment. MICROMACHINES 2018; 9:E468. [PMID: 30424401 PMCID: PMC6187530 DOI: 10.3390/mi9090468] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 09/07/2018] [Accepted: 09/12/2018] [Indexed: 11/18/2022]
Abstract
This paper presents a simple method of droplet formation using liquids that easily wet polydimethylsiloxane (PDMS) surfaces without any surface treatment. Using only structural features and uniform flow focusing, Oil-in-Water (O/W) and Water-in-Oil-in-Water (W/O/W) droplets were formed in the full PDMS structure. Extrusion channel and three-dimensional flow focusing resulted in effective fluidic conditions for droplet formation and the droplet size could be precisely controlled by controlling the flow rate of each phase. The proposed structure can be utilized as an important element for droplet based research, as well as a droplet generator.
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Affiliation(s)
- Dong Hyun Yoon
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
| | - Daiki Tanaka
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Tetsushi Sekiguchi
- Research Organization for Nano & Life Innovation, Waseda University, 513, Tsurumaki-cho, Waseda, Shinjuku-ku, Tokyo 162-0041, Japan.
| | - Shuichi Shoji
- Faculty of Science and Engineering, Waseda University, 3-4-1, Okubo, Shinjuku-ku, Tokyo 169-8555, Japan.
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33
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Feng J, Chen Q, Wu X, Jafari SM, McClements DJ. Formulation of oil-in-water emulsions for pesticide applications: impact of surfactant type and concentration on physical stability. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:21742-21751. [PMID: 29790050 DOI: 10.1007/s11356-018-2183-z] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Accepted: 04/30/2018] [Indexed: 06/08/2023]
Abstract
Oil-in-water (O/W) emulsions can be utilized as effective pesticide delivery systems in the agricultural industry. In this study, the effects of hydrophile-lipophile balance (HLB), concentration, and location of surfactants on the formation and physical stability of O/W emulsions suitable for pesticide applications was investigated using dynamic light scattering and vertical laser profiling. A non-polar pesticide (lambda-cyhalothrin) was used as a model. The pesticide emulsion with the highest stability was obtained using a commercial non-ionic surfactant (polyoxyethylene castor oil ether, EL-20) with a required HLB value of 10.5. Emulsion stability increased as the surfactant concentration was increased from 2 to 6%, which was attributed to the formation of smaller oil droplets during emulsification. Emulsions prepared with the surfactant initially in the oil phase were more stable than those prepared with it initially in the aqueous phase. The optimum formulation of the pesticide emulsion was determined as follows: 5% lambda-cyhalothrin (active ingredient) and 6% EL-20 (surfactant) dissolved in 5% S-200 (aromatic hydrocarbon, as oil phase), then deionized water up to 100%, which met the quality indicators set by the FAO standards. The present study is expected to provide useful information to improve the stability of pesticide emulsions for commercial applications.
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Affiliation(s)
- Jianguo Feng
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, 225009, China
| | - Qicheng Chen
- School of Horticulture and Plant Protection, Yangzhou University, Yangzhou, 225009, China
| | - Xuemin Wu
- College of Science, China Agricultural University, Beijing, 100193, China.
| | - Seid Mahdi Jafari
- Department of Food Materials and Process Design Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
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34
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Whitby CP, Bahuon F. Droplet Fusion in Oil-in-Water Pickering Emulsions. Front Chem 2018; 6:213. [PMID: 29946539 PMCID: PMC6005886 DOI: 10.3389/fchem.2018.00213] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2018] [Accepted: 05/25/2018] [Indexed: 11/17/2022] Open
Abstract
We have formed compound droplets made of two or more drops of immiscible oils by temporarily destabilizing Pickering oil-in-water emulsions. The emulsions used are synergistically stabilized by mixtures of cationic surfactant and negatively-charged particles. They are highly sensitive to the concentration of surfactant present in the emulsions. We took advantage of transient droplet coalescence events that are triggered by reducing the surfactant concentration to fuse together drops of immiscible oils. This study provides guidelines for designing compound droplets by transient (or limited) coalescence in Pickering emulsions. We show that the possible geometries of particle-stabilized compound drops are determined by the interfacial tensions and relative volumes of the drops fused together. The implications of our results for designing strategies to fabricate multiphase drops are discussed.
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Affiliation(s)
- Catherine P. Whitby
- Institute of Fundamental Sciences, Massey University, Palmerston North, New Zealand
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Chen X, McClements DJ, Wang J, Zou L, Deng S, Liu W, Yan C, Zhu Y, Cheng C, Liu C. Coencapsulation of (-)-Epigallocatechin-3-gallate and Quercetin in Particle-Stabilized W/O/W Emulsion Gels: Controlled Release and Bioaccessibility. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:3691-3699. [PMID: 29578697 DOI: 10.1021/acs.jafc.7b05161] [Citation(s) in RCA: 155] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Particle-stabilized W1/O/W2 emulsion gels were fabricated using a two-step procedure: ( i) a W1/O emulsion was formed containing saccharose (for osmotic stress balance) and gelatin (as a gelling agent) in the aqueous phase and polyglycerol polyricinoleate (a lipophilic surfactant) in the oil phase; ( ii) this W1/O emulsion was then homogenized with another water phase (W2) containing wheat gliadin nanoparticles (hydrophilic emulsifier). The gliadin nanoparticles in the external aqueous phase aggregated at pH 5.5, which led to the formation of particle-stabilized W1/O/W2 emulsion gels with good stability to phase separation. These emulsion gels were then used to coencapsulate a hydrophilic bioactive (epigallocatechin-3-gallate, EGCG) in the internal aqueous phase (encapsulation efficiency = 65.5%) and a hydrophobic bioactive (quercetin) in the oil phase (encapsulation efficiency = 97.2%). The emulsion gels improved EGCG chemical stability and quercetin solubility under simulated gastrointestinal conditions, which led to a 2- and 4-fold increase in their effective bioaccessibility, respectively.
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Affiliation(s)
- Xing Chen
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - David Julian McClements
- Biopolymers & Colloids Research Laboratory, Department of Food Science , University of Massachusetts , Amherst , Massachusetts 01003 , United States
| | - Jian Wang
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Liqiang Zou
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Sumeng Deng
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Wei Liu
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Chi Yan
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Yuqing Zhu
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Ce Cheng
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
| | - Chengmei Liu
- State Key Laboratory of Food Science and Technology , Nanchang University , No. 235 Nanjing East Road , Nanchang 330047 , Jiangxi , China
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Silva BFB. SAXS on a chip: from dynamics of phase transitions to alignment phenomena at interfaces studied with microfluidic devices. Phys Chem Chem Phys 2018; 19:23690-23703. [PMID: 28828415 DOI: 10.1039/c7cp02736b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The field of microfluidics offers attractive possibilities to perform novel experiments that are difficult (or even impossible) to perform using conventional bulk and surface-based methods. Such attractiveness comes from several important aspects inherent to these miniaturized devices. First, the flow of fluids under submillimeter confinement typically leads to a drop of inertial forces, meaning that turbulence is practically suppressed. This leads to predictable and controllable flow profiles, along with well-defined chemical gradients and stress fields that can be used for controlled mixing and actuation on the micro and nanoscale. Secondly, intricate microfluidic device designs can be fabricated using cleanroom standard procedures. Such intricate geometries can take diverse forms, designed by researchers to perform complex tasks, that require exquisite control of flow of several components and gradients, or to mimic real world examples, facilitating the establishment of more realistic models. Thirdly, microfluidic devices are usually compatible with in situ or integrated characterization methods that allow constant real-time monitoring of the processes occurring inside the microchannels. This is very different from typical bulk-based methods, where usually one can only observe the final result, or otherwise, take quick snapshots of the evolving process or take aliquots to be analyzed separately. Altogether, these characteristics inherent to microfluidic devices provide researchers with a set of tools that allow not only exquisite control and manipulation of materials at the micro and nanoscale, but also observation of these effects. In this review, we will focus on the use and prospects of combining microfluidic devices with in situ small-angle X-ray scattering (and related techniques such as small-angle neutron scattering and X-ray photon correlation spectroscopy), and their enormous potential for physical-chemical research, mainly in self-assembly and phase-transitions, and surface characterization.
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Affiliation(s)
- Bruno F B Silva
- Department of Life Sciences, INL - International Iberian Nanotechnology Laboratory, Av. Mestre José Veiga, Braga 4715-330, Portugal.
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Ruan Q, Zeng L, Ren J, Yang X. One-step formation of a double Pickering emulsion via modulation of the oil phase composition. Food Funct 2018; 9:4508-4517. [DOI: 10.1039/c8fo00937f] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A facile one-step emulsification strategy was developed to generate a food-grade W/O/W double Pickering emulsion by using corn-peptide-functionalized calcium phosphate particles (CP-CaP) as emulsifier.
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Affiliation(s)
- Qijun Ruan
- Research and Development Center of Food Proteins
- Department of Food Science and Technology
- South China University of Technology
- Guangzhou 510640
- China
| | - Lihua Zeng
- Research and Development Center of Food Proteins
- Department of Food Science and Technology
- South China University of Technology
- Guangzhou 510640
- China
| | - Jiaoyan Ren
- Research and Development Center of Food Proteins
- Department of Food Science and Technology
- South China University of Technology
- Guangzhou 510640
- China
| | - Xiaoquan Yang
- Research and Development Center of Food Proteins
- Department of Food Science and Technology
- South China University of Technology
- Guangzhou 510640
- China
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Zhang P, Chen C, Kang X, Zhang L, Wu C, Zhang J, Han B. In situ synthesis of sub-nanometer metal particles on hierarchically porous metal-organic frameworks via interfacial control for highly efficient catalysis. Chem Sci 2017; 9:1339-1343. [PMID: 29675181 PMCID: PMC5887229 DOI: 10.1039/c7sc04269h] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 12/14/2017] [Indexed: 12/15/2022] Open
Abstract
Sub-nanometer metal particle/hierarchically mesoporous metal–organic framework composites can be synthesized in situ in bio-based surfactant emulsion.
In this work, we developed a strategy to in situ synthesize sub-nanometer metal particle/hierarchically mesoporous metal–organic framework (MOF) composites in emulsion. In this route, water droplets in the emulsion acted as both a solvent of the metal precursors and a template for the hierarchical mesopores of MOFs, and the surfactant was an emulsifier and a reductant for generating metal particles. Au/Zn-MOFs (MOFs formed by Zn2+ and methylimidazole), Ru/Zn-MOFs, Pd/Zn-MOFs, and Au/Cu-MOFs (MOFs formed by Cu2+ and methylimidazole) were prepared using this method, in which ultrafine metal particles (e.g. 0.8 nm) were immobilized uniformly on hierarchically mesoporous MOFs. Au/Zn-MOFs and Au/Cu-MOFs showed outstanding catalytic performances for the selective aerobic oxidation of cyclohexene to 2-cyclohexen-1-one in the absence of an initiator, and Ru/Zn-MOFs were very active and selective for the hydrogenation of diphenyl sulfoxide to diphenyl sulfide. In addition, the catalysts were also very stable in the reactions.
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Affiliation(s)
- Pei Zhang
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . .,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Chunjun Chen
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . .,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Xinchen Kang
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . .,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Lujun Zhang
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . .,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Congyi Wu
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China .
| | - Jianling Zhang
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . .,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
| | - Buxing Han
- Beijing National Laboratory for Molecular Sciences , Key Laboratory of Colloid and Interface and Thermodynamics , Institute of Chemistry , Chinese Academy of Sciences , Beijing 100190 , P. R. China . .,University of Chinese Academy of Sciences , Beijing 100049 , P. R. China
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Wang Z, Liao S, Wang Y. Supramolecular Polymer Emulsifiers for One-step Complex Emulsions. CHINESE JOURNAL OF POLYMER SCIENCE 2017. [DOI: 10.1007/s10118-018-2084-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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40
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Nishimura S, Takami T, Murakami Y. Porous PLGA microparticles formed by “one-step” emulsification for pulmonary drug delivery: The surface morphology and the aerodynamic properties. Colloids Surf B Biointerfaces 2017; 159:318-326. [DOI: 10.1016/j.colsurfb.2017.08.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Revised: 06/22/2017] [Accepted: 08/02/2017] [Indexed: 12/23/2022]
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Jeoffroy E, Demirörs AF, Schwendimann P, Dos Santos S, Danzi S, Hauser A, Partl MN, Studart AR. One-Step Bulk Fabrication of Polymer-Based Microcapsules with Hard-Soft Bilayer Thick Shells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:37364-37373. [PMID: 28967256 DOI: 10.1021/acsami.7b09371] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Microcapsules are important for the protection, transport, and delivery of cargo in a variety of fields but are often too weak to withstand the high mechanical stresses that arise during the preparation and formulation of products. Although thick-shell strong capsules have been developed to circumvent this issue, the microfluidic or multistep methods utilized thus far limit the ease of fabrication and encapsulation throughput. Here, we exploit the phase separation of ternary liquid mixtures to achieve a high-throughput fabrication of strong bilayer microcapsules using a one-step bulk emulsification process. Phase separation is induced by the diffusion of water from the continuous phase into droplets that initially contain a mixture of monomers, cross-linkers, an initiator, and cosolvent γ-butyrolactone. The double emulsions generated via such a phase separation are converted into microcapsules through a polymerization reaction triggered by UV illumination. Surprisingly, the shells of the consolidated capsules exhibit a hard-soft bilayer structure that can be designed to show a resilient eggshell-like fracture behavior. Our method allows for the production of large volumes of microcapsules with such a strong bilayer shell within a time scale of only a few minutes, thus offering an enticing pathway toward the high-throughput fabrication of mechanically robust encapsulation systems.
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Affiliation(s)
- Etienne Jeoffroy
- Road Engineering/Sealing Components, Empa Dübendorf , CH 8600 Dübendorf, Switzerland
| | | | | | - Salomé Dos Santos
- Road Engineering/Sealing Components, Empa Dübendorf , CH 8600 Dübendorf, Switzerland
| | | | | | - Manfred N Partl
- Road Engineering/Sealing Components, Empa Dübendorf , CH 8600 Dübendorf, Switzerland
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Wang Z, Song J, Zhang S, Xu XQ, Wang Y. Formulating Polyethylene Glycol as Supramolecular Emulsifiers for One-Step Double Emulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9160-9169. [PMID: 28825306 DOI: 10.1021/acs.langmuir.7b02326] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
One-step double emulsions via only one-step emulsification are leading to an attractive branch of emulsion research studies owing to the ease of preparation and reduced surfactant numbers. In addition to controlling the oil/water ratio, exploiting emulsifiers with desirable amphiphilicity that can stabilize both the inner and outer water/oil interfaces is crucial to the formation of one-step double emulsions. In particular, new emulsifiers with saving laborious efforts are highly preferred in consideration of low cost and practical applications. In this work, a commonly used homopolymer, polyethylene glycol (PEG), was attempted as emulsifiers to prepare emulsions via one-step emulsification. PEG is generally considered as a hydrophilic polymer and always anchored with a hydrophobic polymer to make the copolymer amphiphilic. In the water-chloroform binary system, PEG itself exhibits amphiphilic performance and tailors the formation of single emulsions or double W/O/W emulsions on the dependence of the oil/water ratio and the PEG concentration. A possible mechanism as explained by dissipative particle dynamics simulation was proposed to demonstrate the amphiphilic feature and emulsification capability of PEG. The amphiphilicity of PEG was further tuned by interacting with iodine as a result of the formation of a supramolecular complex, which, in turn, led to the conversion from single emulsions to O/W/O double emulsions. It is believed that this line of research provides inspiration for the preparation of controllable emulsions through supramolecular routes.
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Affiliation(s)
- Zhen Wang
- Department of Chemistry, Renmin University of China , Beijing 100872, China
| | - Jiaqi Song
- Department of Chemistry, Renmin University of China , Beijing 100872, China
| | - Shiming Zhang
- Department of Chemistry, Renmin University of China , Beijing 100872, China
| | - Xiao-Qi Xu
- Department of Chemistry, Renmin University of China , Beijing 100872, China
| | - Yapei Wang
- Department of Chemistry, Renmin University of China , Beijing 100872, China
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Gustafsson H, Holmberg K. Emulsion-based synthesis of porous silica. Adv Colloid Interface Sci 2017; 247:426-434. [PMID: 28318490 DOI: 10.1016/j.cis.2017.03.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 02/11/2017] [Accepted: 03/10/2017] [Indexed: 10/20/2022]
Abstract
We review the use of various types of emulsions as media for synthesis of porous silica particles. The use of high internal phase emulsions, i.e. emulsions with a high ratio of dispersed to continuous phase, is an approach that has attracted considerable attention. Polymerization of the continuous phase followed by removal of the dispersed phase leads to a material with an even distribution of pores if the emulsion droplets are uniform in size. Another route is to use particle stabilized emulsions as template. This will lead to either hydrophilic or hydrophobic porous silica particles depending on whether the templating emulsion is oil-in-water or water-in-oil, respectively. Use of double emulsions as templates is a way to obtain porous particles with hierarchical porosity, usually both macropores and mesopores. Templating amphiphiles, which are often polyoxyethylene-polyoxypropylene-polyoxyethylene block copolymers, are needed in order to obtain materials with highly ordered pore structure. Non-ordered mesoporous silica with small particle size and relatively large pores can be obtained by emulsifying a silica precursor together with an inert solvent in water and allowing the silica to gel within the drops. Hollow silica spheres, i.e. spherical particles with a void in the middle, can be prepared by using emulsion drops as templates around which silica polymerizes. The particles have nanometer-sized pores penetrating the shell.
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Sesen M, Alan T, Neild A. Droplet control technologies for microfluidic high throughput screening (μHTS). LAB ON A CHIP 2017. [PMID: 28631799 DOI: 10.1039/c7lc00005g] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
The transition from micro well plate and robotics based high throughput screening (HTS) to chip based screening has already started. This transition promises reduced droplet volumes thereby decreasing the amount of fluids used in these studies. Moreover, it significantly boosts throughput allowing screening to keep pace with the overwhelming number of molecular targets being discovered. In this review, we analyse state-of-the-art droplet control technologies that exhibit potential to be used in this new generation of screening devices. Since these systems are enclosed and usually planar, even some of the straightforward methods used in traditional HTS such as pipetting and reading can prove challenging to replicate in microfluidic high throughput screening (μHTS). We critically review the technologies developed for this purpose in depth, describing the underlying physics and discussing the future outlooks.
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Affiliation(s)
- Muhsincan Sesen
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia.
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45
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Zhang M, Nowak M, Malo de Molina P, Abramovitch M, Santizo K, Mitragotri S, Helgeson ME. Synthesis of Oil-Laden Poly(ethylene glycol) Diacrylate Hydrogel Nanocapsules from Double Nanoemulsions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:6116-6126. [PMID: 28605186 DOI: 10.1021/acs.langmuir.7b01162] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Multiple emulsions have received great interest due to their ability to be used as templates for the production of multicompartment particles for a variety of applications. However, scaling these complex droplets to nanoscale dimensions has been a challenge due to limitations on their fabrication methods. Here, we report the development of oil-in-water-in-oil (O1/W/O2) double nanoemulsions via a two-step high-energy method and their use as templates for complex nanogels comprised of inner oil droplets encapsulated within a hydrogel matrix. Using a combination of characterization methods, we determine how the properties of the nanogels are controlled by the size, stability, internal morphology, and chemical composition of the nanoemulsion templates from which they are formed. This allows for identification of compositional and emulsification parameters that can be used to optimize the size and oil encapsulation efficiency of the nanogels. Our templating method produces oil-laden nanogels with high oil encapsulation efficiencies and average diameters of 200-300 nm. In addition, we demonstrate the versatility of the system by varying the types of inner oil, the hydrogel chemistry, the amount of inner oil, and the hydrogel network cross-link density. These nontoxic oil-laden nanogels have potential applications in food, pharmaceutical, and cosmetic formulations.
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Affiliation(s)
- Mengwen Zhang
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
| | - Maksymilian Nowak
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
| | - Paula Malo de Molina
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
| | - Michael Abramovitch
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
| | - Katherine Santizo
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
| | - Samir Mitragotri
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
| | - Matthew E Helgeson
- Department of Chemical Engineering, University of California , Santa Barbara, California 93106, United States
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