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Nakayama Y. Non-Stick Length of Polymer-Polymer Interfaces under Small-Amplitude Oscillatory Shear Measurement. Polymers (Basel) 2023; 16:77. [PMID: 38201742 PMCID: PMC10780565 DOI: 10.3390/polym16010077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 12/22/2023] [Accepted: 12/23/2023] [Indexed: 01/12/2024] Open
Abstract
Interfaces in soft materials often exhibit deviation from non-slip/stick response and play a determining role in the rheological response of the overall system. We discuss detection techniques for the excess interface rheology using small-amplitude oscillatory shear (SAOS) measurements. A stacked bilayer of different polymers is sheared parallel to the interface and the dynamic shear response is measured. Deviation of the bilayer shear modulus from the superposition of the shear moduli of the component layers is analysed. Furthermore, we introduce a frequency-dependent non-stick length based on the bilayer SAOS response to characterize the excess interface rheology. We observe an approximate stick response in the interface in bilayers composed of the chemically same monomer as well as an apparent slip in the interface between immiscible polymers. The results suggest that the proposed non-stick length in SAOS is capable of detecting the apparent interfacial slip. The non-stick length in SAOS is readily applicable to other complex interfaces of different soft materials and offers a convenient tool to characterize the excess interface rheology.
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Affiliation(s)
- Yasuya Nakayama
- Department of Chemical Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
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2
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Mahmoudi M, Alizadeh P, Soltani M. Wound healing performance of electrospun PVA/70S30C bioactive glass/Ag nanoparticles mats decorated with curcumin: In vitro and in vivo investigations. BIOMATERIALS ADVANCES 2023; 153:213530. [PMID: 37356283 DOI: 10.1016/j.bioadv.2023.213530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 06/09/2023] [Accepted: 06/17/2023] [Indexed: 06/27/2023]
Abstract
Biocompatible fibrous scaffold containing polyvinyl alcohol (PVA), 70S30C bioactive glass (BG), silver (Ag) nanoparticles and curcumin (Cur) was fabricated through electrospinning method. Scanning electron microscope (SEM) and Field emission scanning electron microscopy (FESEM) were employed to investigate the morphological characteristics of the scaffolds. In addition, biodegradability, hydrophilicity, and contact angle were studied as criteria for evaluating physical properties of the scaffolds. Tensile strength was reported to be 0.971 ± 0.093 MPa. Also, the viability of fibroblasts after 7 days of cell culture was 93.58 ± 1.36 %. The antibacterial activity against Escherichia coli and Staphylococcus aureus bacteria was illustrated using inhibition zones of 13.12 ± 0.69 and 14.21 ± 1.37 mm, respectively. Histological results revealed that tissue regeneration after 14 days of surgery was much higher for the dressing group compared to the blank group. According to the obtained results, the authors introduce the PVA-BG-Ag-Cur scaffold as a promising candidate for skin tissue engineering applications.
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Affiliation(s)
- Masoud Mahmoudi
- Department of Materials Science and Engineering, Faculty of Engineering & Technology, Tarbiat Modares University, P. O. Box: 14115-143, Tehran, Iran
| | - Parvin Alizadeh
- Department of Materials Science and Engineering, Faculty of Engineering & Technology, Tarbiat Modares University, P. O. Box: 14115-143, Tehran, Iran.
| | - Mohammad Soltani
- Department of Materials Science and Engineering, Faculty of Engineering & Technology, Tarbiat Modares University, P. O. Box: 14115-143, Tehran, Iran
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3
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Ashoorian S, Javadi A, Hosseinpour N, Nassar NN. Interrelationship of Bulk and Oil-Water Interfacial Properties of Asphaltenes. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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4
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Pattnaik S, Swain K, Ramakrishna S. Optimal delivery of poorly soluble drugs using electrospun nanofiber technology: Challenges, state of the art, and future directions. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2023; 15:e1859. [PMID: 36193733 DOI: 10.1002/wnan.1859] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/11/2022] [Accepted: 09/20/2022] [Indexed: 11/07/2022]
Abstract
Poor aqueous solubility of both, existing drug molecules and those which are currently in the developmental stage, have posed a great challenge to pharmaceutical scientists because they often exhibit poor dissolution behavior and subsequent poor and erratic bioavailability. This has triggered extensive research to explore nanotechnology-based technology platforms for possible rescue. Recently, nanofibers have been exploited widely for diverse biomedical applications including for drug delivery. Electrospun nanofibers are capable of preserving the homogeneously loaded therapeutic agents in amorphous state potentialy impairing devitrification. The present review aims at providing an overview of the various key factors that affect the electrospinning process and characteristics of the nanofibers while fabrication of drug loaded nanofibers for poorly soluble drug candidates. The review explores various methodological advancements in the electrospinning process and set-ups for production scale-up. The various types of electrospun nanofibers (like simple matrix, core-sheath, Janus, and inclusion complex nanofibers) that have been exploited for the delivery of poorly soluble drugs are also critically assessed. This article is categorized under: Therapeutic Approaches and Drug Discovery > Emerging Technologies.
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Affiliation(s)
- Satyanarayan Pattnaik
- Division of Advanced Drug Delivery, Talla Padmavathi College of Pharmacy, Warangal, India
| | - Kalpana Swain
- Division of Advanced Drug Delivery, Talla Padmavathi College of Pharmacy, Warangal, India
| | - Seeram Ramakrishna
- NUS Center for Nanofibers and Nanotechnology, Department of Mechanical Engineering, National University of Singapore, Singapore, Singapore
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5
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Liao Z, Dong L, Lu M, Zheng S, Cao Y, Rogers M, Lan Y. Construction of interfacial crystallized oleogel emulsion with improved thermal stability. Food Chem 2023; 420:136029. [PMID: 37037111 DOI: 10.1016/j.foodchem.2023.136029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 02/08/2023] [Accepted: 03/21/2023] [Indexed: 03/29/2023]
Abstract
In this study, we reported a facile strategy to produce an interfacial crystallized oleogel emulsion for improved thermal stability. The interfacial crystallization of ceramide (non-interfacial active oleogelator) was achieved by addition of a surface active compound, which was demonstrated by interfacial rheology tests and polarized light microscopy. For successfully prepared interfacial crystallized emulsions, smaller particle size was observed when the gelator concentration was lower. However, better thermal stability was achieved when oleogelator concentration was higher than 1 wt%. Results from differential scanning calorimetry, X-ray diffraction and Fourier transform infrared spectroscopy suggested that the interfacial adsorption of ceramide was due to its co-crystallization with the emulsifier driven by hydrogen bonds formed by multiple sites. It provided appropriate crystallinity and steric repulsion for oleogel emulsions against oil droplet coalescence during heating process. This strategy greatly enriches oleogel emulsion formulations and their potential applications in food products involved with thermal treatment.
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6
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Khedri M, Beheshtizadeh N, Rostami M, Sufali A, Rezvantalab S, Dahri M, Maleki R, Santos HA, Shahbazi MA. Artificial Intelligence Deep Exploration of Influential Parameters on Physicochemical Properties of Curcumin‐Loaded Electrospun Nanofibers. ADVANCED NANOBIOMED RESEARCH 2022. [DOI: 10.1002/anbr.202100143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Affiliation(s)
- Mohammad Khedri
- Computational Biology and Chemistry Group (CBCG) Universal Scientific Education and Research Network (USERN) Tehran Iran
| | - Nima Beheshtizadeh
- Department of Tissue Engineering School of Advanced Technologies in Medicine Tehran University of Medical Sciences 14177-55469 Tehran Iran
- Regenerative Medicine group (REMED) Universal Scientific Education and Research Network (USERN) Tehran Iran
| | - Mohammadreza Rostami
- Division of Food Safety and Hygiene Department of Environmental Health Engineering School of Public Health Tehran University of Medical Sciences Tehran Iran
- Food Science and Nutrition group (FSAN) Universal Scientific Education and Research Network (USERN) Tehran Iran
| | - Ali Sufali
- Computational Biology and Chemistry Group (CBCG) Universal Scientific Education and Research Network (USERN) Tehran Iran
| | - Sima Rezvantalab
- Renewable Energies Department Faculty of Chemical Engineering Urmia University of Technology 57166-419 Urmia Iran
| | - Mohammad Dahri
- Computational Biology and Chemistry Group (CBCG) Universal Scientific Education and Research Network (USERN) Tehran Iran
| | - Reza Maleki
- Computational Biology and Chemistry Group (CBCG) Universal Scientific Education and Research Network (USERN) Tehran Iran
| | - Hélder A. Santos
- Department of Biomedical Engineering University Medical Center Groningen University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
- Drug Research Program Division of Pharmaceutical Chemistry and Technology Faculty of Pharmacy University of Helsinki 00014 Helsinki Finland
- Helsinki Institute of Life Science (HiLIFE) University of Helsinki 00014 Helsinki Finland
| | - Mohammad-Ali Shahbazi
- Department of Biomedical Engineering University Medical Center Groningen University of Groningen Antonius Deusinglaan 1 9713 AV Groningen The Netherlands
- Zanjan Pharmaceutical Nanotechnology Research Center (ZPNRC) Zanjan University of Medical Sciences 45139-56184 Zanjan Iran
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7
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Costa ALR, Gomes A, Cangussu LB, Cunha RL, de Oliveira LS, Franca AS. Stabilization mechanisms of O/W emulsions by cellulose nanocrystals and sunflower protein. Food Res Int 2022; 152:110930. [DOI: 10.1016/j.foodres.2021.110930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 12/22/2021] [Accepted: 12/25/2021] [Indexed: 11/04/2022]
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8
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Parajuli S, Ureña-Benavides EE. Fundamental aspects of nanocellulose stabilized Pickering emulsions and foams. Adv Colloid Interface Sci 2022; 299:102530. [PMID: 34610863 DOI: 10.1016/j.cis.2021.102530] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Revised: 09/15/2021] [Accepted: 09/25/2021] [Indexed: 11/26/2022]
Abstract
Nanocelluloses in recent years have garnered a lot of attention for their use as stabilizers of liquid-liquid and gas-liquid interfaces. Both cellulose nanocrystals (CNCs) and cellulose nanofibers (CNFs) have been used extensively in multiple studies to prepare emulsions and foams. However, there is limited literature available that systematically discusses the mechanisms that affect the ability of nanocelluloses (modified and unmodified) to stabilize different types of interfaces. This review briefly discusses key factors that affect the stability of Pickering emulsions and foams and provides a detailed and systematic analysis of the current state knowledge on factors affecting the stabilization of liquid-liquid and gas-liquid interfaces by nanocelluloses. The review also discusses the effect of nanocellulose surface modifications on mechanisms driving the Pickering stabilization of these interfaces.
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Fernandes Soares I, de Oliveira MCK, Feijó Naccache M, Nele M. Effects of monovalent and divalent cations on the rheology of organic acid laden interfaces. J DISPER SCI TECHNOL 2021. [DOI: 10.1080/01932691.2021.2017296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Isabela Fernandes Soares
- Department of Mechanical Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil
| | | | - Mônica Feijó Naccache
- Department of Mechanical Engineering, Pontifical Catholic University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Márcio Nele
- Department of Chemical Engineering, Federal University of Rio de Janeiro, Cidade Universitária, Rio de Janeiro, Brazil
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10
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VanWees SR, Rankin SA, Hartel RW. Shrinkage in frozen desserts. Compr Rev Food Sci Food Saf 2021; 21:780-808. [PMID: 34954889 DOI: 10.1111/1541-4337.12888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 11/22/2021] [Accepted: 12/01/2021] [Indexed: 11/27/2022]
Abstract
Shrinkage is a well-documented defect in frozen desserts, yet the root causes and mechanisms remain unknown. Characterized by the loss of volume during storage, shrinkage arose during the mid-twentieth century as production of frozen desserts grew to accommodate a larger market. Early research found that shrinkage was promoted by high protein, solids, and overrun, as well as postproduction factors such as fluctuations in external temperature and pressure. Rather than approaching shrinkage as a cause-and-effect defect as previous approaches have, we employ a physicochemical approach to characterize and understand shrinkage as collapse of the frozen foam caused by destabilization of the dispersed air phase. The interfacial composition and physical properties, as well as the kinetic stability of air cells within the frozen matrix ultimately affect product susceptibility to shrinkage. The mechanism of shrinkage remains unknown, as frozen desserts are highly complex, but is rooted in the physicochemical properties of the frozen foam. Functional ingredients and processing methods that optimize the formation and stabilization of the frozen foam are essential to preventing shrinkage in frozen desserts.
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Affiliation(s)
- Samantha R VanWees
- Department of Food Science, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Scott A Rankin
- Department of Food Science, University of Wisconsin-Madison, Madison, Wisconsin, USA
| | - Richard W Hartel
- Department of Food Science, University of Wisconsin-Madison, Madison, Wisconsin, USA
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11
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Transient interfacial rheology and polar component dynamics at oil-brine interfaces. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126773] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Ashoorian S, Javadi A, Hosseinpour N, Husein M. Evolution of adsorbed layers of asphaltenes at oil-water interfaces: A novel experimental protocol. J Colloid Interface Sci 2021; 594:80-91. [PMID: 33756371 DOI: 10.1016/j.jcis.2021.02.123] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/25/2021] [Accepted: 02/26/2021] [Indexed: 10/22/2022]
Abstract
HYPOTHESIS Asphaltenes can form rigid interfacial films surrounding water droplets rendering water separation from crude oil sluggish. Therefore, the quantitative characterization of such complex film formation is of great importance. As the adsorbed layers of asphaltene illustrate crumpling under compression at certain conditions, the evolution process from soft to rigid states of the film can be evaluated considering standard deviations from Young-Laplace shape fitting. EXPERIMENTAL In this study, novel experimental protocols are introduced to investigate the evolution of adsorbed asphaltene layer to a film of aggregates at model oil/water interface by means of dynamic interfacial tension (IFT) and dilational surface rheology measurements. In particular, the surface elasticity and standard deviation from the Young-Laplace shape fitting (YL-SD) are introduced as important indicators for the transformation of a regular asphaltene adsorbed layer to a film of aggregates. Different parameters affecting the film formation and stability, such as aging time, asphaltene concentration, and history of interfacial dynamics, are discussed and linked to emulsion stability. FINDINGS It is shown for the first time that the standard deviation of drop profile fitting from the Young-Laplace equation can be used as a rigorous parameter to reveal the properties of the interfacial asphaltene film, which cannot be recognized by regular IFT measurements. Via this novel technique, it is revealed that the transformation of an asphaltene adsorbed layer to a rigid film depends not only on the asphaltene concentration but also on the aging time and the interfacial area perturbations. The results of this new method are supported by measurements of the dilational surface elasticity, which is known as an important parameter for the characterization of complex adsorbed layers, and further verified by an emulsion stability analysis.
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Affiliation(s)
- Sefatallah Ashoorian
- Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran
| | - Aliyar Javadi
- Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran; Institute of Process Engineering and Environmental Technology, TU Dresden, 01062 Dresden, Germany.
| | - Negahdar Hosseinpour
- Institute of Petroleum Engineering, School of Chemical Engineering, College of Engineering, University of Tehran, 11155-4563 Tehran, Iran.
| | - Maen Husein
- Department of Chemical & Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada
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13
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Correia EL, Brown N, Razavi S. Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:374. [PMID: 33540620 PMCID: PMC7913064 DOI: 10.3390/nano11020374] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/01/2021] [Revised: 01/26/2021] [Accepted: 01/29/2021] [Indexed: 02/08/2023]
Abstract
The use of the Janus motif in colloidal particles, i.e., anisotropic surface properties on opposite faces, has gained significant attention in the bottom-up assembly of novel functional structures, design of active nanomotors, biological sensing and imaging, and polymer blend compatibilization. This review is focused on the behavior of Janus particles in interfacial systems, such as particle-stabilized (i.e., Pickering) emulsions and foams, where stabilization is achieved through the binding of particles to fluid interfaces. In many such applications, the interface could be subjected to deformations, producing compression and shear stresses. Besides the physicochemical properties of the particle, their behavior under flow will also impact the performance of the resulting system. This review article provides a synopsis of interfacial stability and rheology in particle-laden interfaces to highlight the role of the Janus motif, and how particle anisotropy affects interfacial mechanics.
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Affiliation(s)
| | | | - Sepideh Razavi
- School of Chemical, Biological, and Materials Engineering, University of Oklahoma, 100 E. Boyd Street, Norman, OK 73019, USA; (E.L.C.); (N.B.)
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14
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Huyst AM, Deleu LJ, Luyckx T, Lambrecht MA, Van Camp J, Delcour JA, Van der Meeren P. Influence of hydrophobic interfaces and shear on ovalbumin amyloid-like fibril formation in oil-in-water emulsions. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106327] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Ji X, Wang X, Zhang Y, Zang D. Interfacial viscoelasticity and jamming of colloidal particles at fluid-fluid interfaces: a review. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2020; 83:126601. [PMID: 32998118 DOI: 10.1088/1361-6633/abbcd8] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Colloidal particles can be adsorbed at fluid-fluid interfaces, a phenomenon frequently observed in particle-stabilized foams, Pickering emulsions, and bijels. Particles adsorbed at interfaces exhibit unique physical and chemical behaviors, which affect the mechanical properties of the interface. Therefore, interfacial colloidal particles are of interest in terms of both fundamental and applied research. In this paper, we review studies on the adsorption of colloidal particles at fluid-fluid interfaces, from both thermodynamic and mechanical points of view, and discuss the differences as compared with surfactants and polymers. The unique particle interactions induced by the interfaces as well as the particle dynamics including lateral diffusion and contact line relaxation will be presented. We focus on the rearrangement of the particles and the resultant interfacial viscoelasticity. Particular emphasis will be given to the effects of particle shape, size, and surface hydrophobicity on the interfacial particle assembly and the mechanical properties of the obtained particle layer. We will also summarize recent advances in interfacial jamming behavior caused by adsorption of particles at interfaces. The buckling and cracking behavior of particle layers will be discussed from a mechanical perspective. Finally, we suggest several potential directions for future research in this area.
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Affiliation(s)
- Xiaoliang Ji
- Soft Matter & Complex Fluids Group, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, People's Republic of China
| | - Xiaolu Wang
- Institute of Welding and Surface Engineering Technology, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, 100124, People's Republic of China
| | - Yongjian Zhang
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi'an University, Xi'an 710065, People's Republic of China
| | - Duyang Zang
- Soft Matter & Complex Fluids Group, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, 710129, People's Republic of China
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16
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Paximada P, Kanavou E, Mandala IG. Effect of rheological and structural properties of bacterial cellulose fibrils and whey protein biocomposites on electrosprayed food-grade particles. Carbohydr Polym 2020; 241:116319. [DOI: 10.1016/j.carbpol.2020.116319] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/14/2020] [Accepted: 04/14/2020] [Indexed: 10/24/2022]
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17
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Boadi FO, Zhang J, Yu X, Bhatia S, Sampson NS. Alternating Ring-Opening Metathesis Polymerization Provides Easy Access to Functional and Fully Degradable Polymers. Macromolecules 2020; 53:5857-5868. [PMID: 33776145 PMCID: PMC7993654 DOI: 10.1021/acs.macromol.0c01051] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Polymers with hydrolyzable groups in their backbones have numerous potential applications in biomedicine, lithography, energy storage and electronics. In this study, acetal and ester functionalities were incorporated into the backbones of copolymers by means of alternating ring-opening metathesis polymerization catalyzed by third-generation Grubbs ruthenium catalyst. Specifically, combining large-ring (7-10 atoms) cyclic acetal or lactone monomers with bicyclo[4.2.0]oct-1(8)-ene-8-carboxamide monomers provided perfectly alternating copolymers with acetal or ester functionality in the backbones and low to moderate molecular weight distribution (Đ M = 1.2-1.6). Copolymers containing ester and acetal backbones hydrolyzed to significant extent under basic condition (pH 13) and acidic conditions (pH ≤ 5) respectively to yield the expected by-products within 30 hours at moderate temperature. Unlike the copolymer with all-carbon backbone, copolymers with heteroatom-containing backbone exhibited viscoelastic behavior with crossover frequency which decreases as the size of the R group on the acetal increases. In contrast, the glass transition temperature (T g) decreases as the size of the R group decreases. The rate of hydrolysis of the acetal copolymers was also dependent on the R group. Thus, ruthenium-catalyzed alternating ring-opening metathesis copolymerization provides heterofunctional copolymers whose degradation rates, glass transition temperatures, and viscoelastic moduli can be controlled.
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Affiliation(s)
- Francis O. Boadi
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
| | - Jingling Zhang
- Department of Materials Science and Chemical Engineering, Stony Brook University, Stony Brook, NY 11794-2275
| | - Xiaoxi Yu
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
| | - Surita Bhatia
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
| | - Nicole S Sampson
- Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400
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18
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Dopierała K, Krajewska M, Weiss M. Physicochemical Characterization of Oleanolic Acid-Human Serum Albumin Complexes for Pharmaceutical and Biosensing Applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3611-3623. [PMID: 32176505 DOI: 10.1021/acs.langmuir.0c00087] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Among numerous compounds found in marine organisms, triterpenes have attracted considerable research interest due to a beneficial impact on health including anti-inflammatory, antitumor, antiviral, and antioxidation effects. Specifically, new functionalities of oleanolic acid (OLA) have been revealed recently, indicating possible applications in nutrition and pharmaceuticals. However, this bioactive material has limited value due to low water solubility and stability. Therefore, oleanolic acid needs a carrier that protects it and enables controlled release in the human body. Innovative drug delivery systems provide a promising strategy for overcoming these problems. However, the development of those systems requires a comprehensive understanding of the physicochemical properties of triterpenes and their carriers as well as the interactions between them. Among numerous substances, human serum albumin (HSA) has been widely studied as a drug carrier. In addition, human serum albumin is the main blood plasma protein responsible for the transport of drugs and metabolites; therefore, the interactions between that protein and other substances are of physiological and pharmaceutical importance. Moreover, sensing the HSA level in blood plasma is an important challenge that requires binding studies on a molecular scale. The aim of this study was to investigate the properties of oleanolic acid in the presence of human serum albumin in terms of thermodynamics, morphology, and viscoelasticity at the air/water interface. Moreover, the wettability, surface free energy, and topography of the films after deposition on the solid substrate were determined. The results have been discussed in terms of providing physicochemical insight into the interfacial behavior of the OLA-HSA complex, which is crucial for pharmaceutical and bioanalytical applications.
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19
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Artiga-Artigas M, Reichert C, Salvia-Trujillo L, Zeeb B, Martín-Belloso O, Weiss J. Protein/Polysaccharide Complexes to Stabilize Decane-in-Water Nanoemulsions. FOOD BIOPHYS 2020. [DOI: 10.1007/s11483-019-09622-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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20
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Luviano AS, Hernández-Pascacio J, Ondo D, Campbell RA, Piñeiro Á, Campos-Terán J, Costas M. Highly viscoelastic films at the water/air interface: α-Cyclodextrin with anionic surfactants. J Colloid Interface Sci 2019; 565:601-613. [PMID: 32032852 DOI: 10.1016/j.jcis.2019.12.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 12/02/2019] [Accepted: 12/03/2019] [Indexed: 02/07/2023]
Abstract
This work showcases the remarkable viscoelasticity of films consisting of α-cyclodextrin (α-CD) and anionic surfactants (S) at the water/air interface, the magnitude of which has not been observed in similar systems. The anionic surfactants employed are sodium salts of a homologous series of n-alkylsulfates (n = 8-14) and of dodecylsulfonate. Our hypothesis was that the very high viscoelasticity can be systematically related to the bulk and interfacial properties of the system. Through resolution of the bulk distribution of species using isothermal titration calorimetry, the high dilatational modulus is related to (α-CD)2:S1 inclusion complexes in the bulk with respect to both the bulk composition and temperature. Direct interfacial characterization of α-CD and sodium dodecylsulfate films at 283.15 K using ellipsometry and neutron reflectometry reveals that the most viscoelastic films consist of a highly ordered monolayer of 2:1 complexes with a minimum amount of any other component. The orientation of the complexes in the films and their driving force for adsorption are discussed in the context of results from molecular dynamics simulations. These findings open up clear potential for the design of new functional materials or molecular sensors based on films with specific mechanical, electrical, thermal, chemical, optical or even magnetic properties.
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Affiliation(s)
- Alberto S Luviano
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, CdMx 04510, Mexico; Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana, Unidad Cuajimalpa, Av. Vasco de Quiroga 4871, Col. Santa Fe, Delegación Cuajimalpa de Morelos, 05348, CdMx, Mexico
| | - Jorge Hernández-Pascacio
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, CdMx 04510, Mexico
| | - Daniel Ondo
- Department of Physical Chemistry, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Richard A Campbell
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble, France; Division of Pharmacy and Optometry, University of Manchester, Manchester M13 9PT, United Kingdom.
| | - Ángel Piñeiro
- Departamento de Física de Aplicada, Facultade de Física, Universidade de Santiago de Compostela, E-15782 Santiago de Compostela, Spain.
| | - José Campos-Terán
- Departamento de Procesos y Tecnología, Universidad Autónoma Metropolitana, Unidad Cuajimalpa, Av. Vasco de Quiroga 4871, Col. Santa Fe, Delegación Cuajimalpa de Morelos, 05348, CdMx, Mexico; Lund Institute of Advanced Neutron and X-ray Science, Lund University, Scheelevägen 19, 223 70 Lund, Sweden.
| | - Miguel Costas
- Laboratorio de Biofisicoquímica, Departamento de Fisicoquímica, Facultad de Química, Universidad Nacional Autónoma de México, CdMx 04510, Mexico.
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21
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Chang CM, Yang HC, Urban PL. On the mechanism of automated fizzy extraction. PEERJ ANALYTICAL CHEMISTRY 2019. [DOI: 10.7717/peerj-achem.2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Fizzy extraction (FE) facilitates analysis of volatile solutes by promoting their transfer from the liquid to the gas phase. A carrier gas is dissolved in the sample under moderate pressure (Δp ≈ 150 kPa), followed by an abrupt decompression, what leads to effervescence. The released gaseous analytes are directed to an on-line detector due to a small pressure difference. FE is advantageous in chemical analysis because the volatile species are released in a short time interval, allowing for pulsed injection, and leading to high signal-to-noise ratios. To shed light on the mechanism of FE, we have investigated various factors that could potentially contribute to the extraction efficiency, including: instrument-related factors, method-related factors, sample-related factors, and analyte-related factors. In particular, we have evaluated the properties of volatile solutes, which make them amenable to FE. The results suggest that the organic solutes may diffuse to the bubble lumen, especially in the presence of salt. The high signal intensities in FE coupled with mass spectrometry are partly due to the high sample introduction rate (upon decompression) to a mass-sensitive detector. However, the analytes with different properties (molecular weight, polarity) reveal distinct temporal profiles, pointing to the effect of bubble exposure to the sample matrix. A sufficient extraction time (~12 s) is required to extract less volatile solutes. The results presented in this report can help analysts to predict the occurrence of matrix effects when analyzing real samples. They also provide a basis for increasing extraction efficiency to detect low-abundance analytes.
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Affiliation(s)
- Chun-Ming Chang
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
| | - Hao-Chun Yang
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu, Taiwan
| | - Pawel L. Urban
- Department of Chemistry, National Tsing Hua University, Hsinchu, Taiwan
- Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu, Taiwan
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22
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Core-shell nanofibers as drug delivery systems. ACTA PHARMACEUTICA (ZAGREB, CROATIA) 2019; 69:131-153. [PMID: 31259723 DOI: 10.2478/acph-2019-0014] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 11/04/2018] [Indexed: 01/19/2023]
Abstract
Core-shell nanofibers have grown in popularity over the last decade owing to their special features and their many applications in biomedicine. They can be produced by electrospinning of immiscible polymer blends or emulsions through a single nozzle or by electrospinning using a coaxial nozzle. Several of the electrospinning parameters allow great versatility for the compositions and diameters of core-shell nanofibers to be produced. Morphology of core-shell nanofibers can be investigated using transmission electron microscopy and, in some cases, scanning electron microscopy. Several studies have shown that core-shell nanofibers have some advantages over monolithic nanofibers, such as better drug, protein, gene or probiotic incorporation into the nanofibers, greater control over drug release, and maintenance of protein structure and activity during electrospinning. We herein review the production and characterization of core-shell nanofibers, the critical parameters that affect their development, and their advantages as delivery systems.
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23
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Raghunandan A, Hirsa AH, Underhill PT, Lopez JM. Predicting Steady Shear Rheology of Condensed-Phase Monomolecular Films at the Air-Water Interface. PHYSICAL REVIEW LETTERS 2018; 121:164502. [PMID: 30387637 DOI: 10.1103/physrevlett.121.164502] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Revised: 05/30/2018] [Indexed: 06/08/2023]
Abstract
Predicting the non-Newtonian shear response of soft interfaces in biophysical systems and engineered products has been compromised by the use of linear (Newtonian) constitutive equations. We present a generalized constitutive equation, with tractable material properties, governing the response of Newtonian and non-Newtonian interfaces subjected to a wide range of steady shear. With experiments spanning six decades of shear rate, we capture and unify divergent reports of shear-thinning behavior of monomolecular films of the lipid dipalmitoylphosphatidylcholine, the primary constituent of mammalian cell walls and lung surfactant, at near-physiological packing densities.
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Affiliation(s)
- Aditya Raghunandan
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
| | - Amir H Hirsa
- Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
| | - Patrick T Underhill
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180-3590, USA
| | - Juan M Lopez
- School of Mathematical and Statistical Sciences, Arizona State University, Tempe, Arizona 85287, USA
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24
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Emulsifying properties of ruptured microalgae cells: Barriers to lipid extraction or promising biosurfactants? Colloids Surf B Biointerfaces 2018; 170:438-446. [PMID: 29957533 DOI: 10.1016/j.colsurfb.2018.06.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 06/20/2018] [Accepted: 06/20/2018] [Indexed: 12/16/2022]
Abstract
A systematic investigation of the emulsifying properties of ruptured algae cells was performed for the first time. The slurry of ruptured algae cells was separated into different biomass fractions, namely the cell debris, the delipidated debris, the serum, and the lipid. The interfacial interactions of these biomass fractions with a nonpolar solvent (e.g. hexane or hexadecane) were characterized using pendant drop tensiometry and interfacial shear rheology. The stability of the different emulsions (formed by the different biomass fractions) was tested using analytical centrifugation. The extracted lipid was an excellent surfactant that reduced the interfacial tension, however, it was not effective at stabilizing the emulsions. The protein-rich serum produced a strong interfacial film that stabilized the emulsions against coalescence during centrifugation. The cell debris stabilized the emulsions to a lesser extent by adsorbing to the droplet surface, presumably via interactions with hydrophobic extracellular polymeric substances (EPS). However, neither the serum nor the cell debris were very effective surfactants, and required the presence of the lipid fraction to produce small emulsion droplets. When present together, the components exhibited competitive interfacial adsorption, which influenced emulsion stability. In particular, the interruption of the protein film by the presence of lipid or cell debris reduced the stability of the emulsions. This study provides a new mechanistic understanding of emulsification during wet lipid extraction from microalgae that will be useful for determining strategies to improve solvent recovery. The results also suggest potential for developing effective bioemulsifiers or biosurfactants from fractionated microalgae biomass for commercial application.
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25
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Zhang Y, Si J, Cui Q, Wang G, Bai Y. Nonlinear mechanical behaviors of a nanoparticle monolayer at the air-water interface. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2018; 41:29. [PMID: 29488019 DOI: 10.1140/epje/i2018-11633-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 02/05/2018] [Indexed: 06/08/2023]
Abstract
Nanoparticle can adsorb at the air-water interface and gives rise to the special interfacial mechanical properties. With the influence of external stimulus, the adsorption state of the particles may be changed and in turn the mechanical properties of the particle layer. In this work, we study the mechanical properties of a monolayer of silica nanoparticles deposited in the Langmuir trough. The area of the monolayer was varied sinusoidally by two oscillating barriers and the surface pressure was monitored by two orthogonal Wilhelmy plates. It has been found that the surface pressure of the particle layer exhibits a significant anisotropic effect. At the early stage of the oscillation, the surface pressure versus time is sinusoidal. However, with the increase of the oscillation time, the response of the particle layer significantly deviates the sinusoidal function, which implies that the response becomes nonlinear caused by a long-term oscillation. The fast Fourier Transformation (FFT) of the surface pressure data shows that the non-sinusoidal response is composed of several fundamental frequency responses. We eventually obtained the time variation of the compression modulus E and shear modulus G . A possible mechanism was proposed to account for the mechanical properties change and the nonlinear behavior of the particle monolayer.
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Affiliation(s)
- Yongjian Zhang
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi'an University, 710065, Xi'an, China.
| | - Jiaqi Si
- Honors College, Northwestern Polytechnical University, 710129, Xi'an, China
| | - Qirui Cui
- MOE Key Laboratory, Northwestern Polytechnical University, 710129, Xi'an, China
| | - Gengtao Wang
- Honors College, Northwestern Polytechnical University, 710129, Xi'an, China
| | - Yujie Bai
- Shaanxi Key Laboratory of Surface Engineering and Remanufacturing, Xi'an University, 710065, Xi'an, China
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26
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Li Q, Zhao Z. Characterization of the Structural and Colloidal Properties of α-Lactalbumin/Chitosan Complexes as a Function of Heating. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:972-978. [PMID: 29301069 DOI: 10.1021/acs.jafc.7b04628] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This research investigated the interaction between α-lactalbumin (α-la) and chitosan at different temperatures. Chitosan was added to α-la solution (5 g L-1) to achieve different α-la/chitosan ratios (8:1, 5:1, and 2:1), which were then subjected to different heating temperatures (20, 70, and 90 °C). The results indicated that a low amount of chitosan (8:1) precipitated α-la molecules. Increasing chitosan to a ratio of 5:1 resulted in exposure of the internal structure of α-la, and those formed complexes had high turbidity and average size, which were decreased by an increasing temperature. A further increase of chitosan to a ratio of 2:1 protected the internal structure of α-la molecules. All samples exhibited a similar adsorption behavior at the air/water interface, but the presence of chitosan significantly increased film elasticity. The produced complexes can be regarded as functional ingredients, which can be used as an emulsifying agent and a delivery material to control the release of bioactive compounds.
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Affiliation(s)
- Quanyang Li
- College of Light Industry and Food Engineering, Guangxi University , Nanning, Guangxi 530004, People's Republic of China
| | - Zhengtao Zhao
- College of Light Industry and Food Engineering, Guangxi University , Nanning, Guangxi 530004, People's Republic of China
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27
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Zang D, Yu Y, Chen Z, Li X, Wu H, Geng X. Acoustic levitation of liquid drops: Dynamics, manipulation and phase transitions. Adv Colloid Interface Sci 2017; 243:77-85. [PMID: 28343560 DOI: 10.1016/j.cis.2017.03.003] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 03/14/2017] [Accepted: 03/15/2017] [Indexed: 12/15/2022]
Abstract
The technique of acoustic levitation normally produces a standing wave and the potential well of the sound field can be used to trap small objects. Since no solid surface is involved it has been widely applied for the study of fluid physics, nucleation, bio/chemical processes, and various forms of soft matter. In this article, we survey the works on drop dynamics in acoustic levitation, focus on how the dynamic behavior is related to the rheological properties and discuss the possibility to develop a novel rheometer based on this technique. We review the methods and applications of acoustic levitation for the manipulation of both liquid and solid samples and emphasize the important progress made in the study of phase transitions and bio-chemical analysis. We also highlight the possible open areas for future research.
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Affiliation(s)
- Duyang Zang
- Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710129, China.
| | - Yinkai Yu
- Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710129, China
| | - Zhen Chen
- Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710129, China
| | - Xiaoguang Li
- Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710129, China
| | - Hongjing Wu
- Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710129, China
| | - Xingguo Geng
- Functional Soft Matter & Materials Group, Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, School of Science, Northwestern Polytechnical University, Xi'an 710129, China
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28
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Paximada P, Echegoyen Y, Koutinas AA, Mandala IG, Lagaron JM. Encapsulation of hydrophilic and lipophilized catechin into nanoparticles through emulsion electrospraying. Food Hydrocoll 2017. [DOI: 10.1016/j.foodhyd.2016.11.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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29
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The rheological properties of beta amyloid Langmuir monolayers: Comparative studies with melittin peptide. Colloids Surf B Biointerfaces 2016; 146:180-7. [DOI: 10.1016/j.colsurfb.2016.06.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 05/24/2016] [Accepted: 06/01/2016] [Indexed: 11/22/2022]
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30
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The Impact of Polyoxyethylene Sorbitan Surfactants in the Microstructure and Rheological Behaviour of Emulsions Made With Melted Fat From Cupuassu (Theobroma grandiflorum). J SURFACTANTS DETERG 2016. [DOI: 10.1007/s11743-016-1820-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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31
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Pelipenko J, Kocbek P, Kristl J. Critical attributes of nanofibers: Preparation, drug loading, and tissue regeneration. Int J Pharm 2015; 484:57-74. [DOI: 10.1016/j.ijpharm.2015.02.043] [Citation(s) in RCA: 154] [Impact Index Per Article: 17.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2014] [Revised: 02/16/2015] [Accepted: 02/16/2015] [Indexed: 12/13/2022]
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32
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Maas M, Hess U, Rezwan K. The contribution of rheology for designing hydroxyapatite biomaterials. Curr Opin Colloid Interface Sci 2014. [DOI: 10.1016/j.cocis.2014.09.002] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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Valizadeh A, Mussa Farkhani S. Electrospinning and electrospun nanofibres. IET Nanobiotechnol 2014; 8:83-92. [DOI: 10.1049/iet-nbt.2012.0040] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Alireza Valizadeh
- Department of Medical NanotechnologyFaculty of Advanced Medical ScienceTabriz University of Medical SciencesTabriz 51664Iran
- Student Research CommitteeTabriz University of Medical SciencesTabriz 51664Iran
| | - Samad Mussa Farkhani
- Department of Medical NanotechnologyFaculty of Advanced Medical ScienceTabriz University of Medical SciencesTabriz 51664Iran
- Student Research CommitteeTabriz University of Medical SciencesTabriz 51664Iran
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34
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Particle laden fluid interfaces: dynamics and interfacial rheology. Adv Colloid Interface Sci 2014; 206:303-19. [PMID: 24200090 DOI: 10.1016/j.cis.2013.10.010] [Citation(s) in RCA: 122] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Revised: 10/09/2013] [Accepted: 10/10/2013] [Indexed: 12/30/2022]
Abstract
We review the dynamics of particle laden interfaces, both particle monolayers and particle+surfactant monolayers. We also discuss the use of the Brownian motion of microparticles trapped at fluid interfaces for measuring the shear rheology of surfactant and polymer monolayers. We describe the basic concepts of interfacial rheology and the different experimental methods for measuring both dilational and shear surface complex moduli over a broad range of frequencies, with emphasis in the micro-rheology methods. In the case of particles trapped at interfaces the calculation of the diffusion coefficient from the Brownian trajectories of the particles is calculated as a function of particle surface concentration. We describe in detail the calculation in the case of subdiffusive particle dynamics. A comprehensive review of dilational and shear rheology of particle monolayers and particle+surfactant monolayers is presented. Finally the advantages and current open problems of the use of the Brownian motion of microparticles for calculating the shear complex modulus of monolayers are described in detail.
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35
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Ghosh P, Banik M. Effects of Salts Containing Mono-, Di-, and Trivalent Ions on Electrical and Rheological Properties of Oil-Water Interface in Presence of Cationic Surfactant: Importance in the Stability of Oil-in-Water Emulsions. J DISPER SCI TECHNOL 2014. [DOI: 10.1080/01932691.2013.791990] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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36
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Pelipenko J, Kristl J, Janković B, Baumgartner S, Kocbek P. The impact of relative humidity during electrospinning on the morphology and mechanical properties of nanofibers. Int J Pharm 2013; 456:125-34. [DOI: 10.1016/j.ijpharm.2013.07.078] [Citation(s) in RCA: 165] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 07/29/2013] [Accepted: 07/30/2013] [Indexed: 11/16/2022]
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Abstract
The idea of creating replacement for damaged or diseased tissue, which will mimic the physiological conditions and simultaneously promote regeneration by patients' own cells, has been a major challenge in the biomedicine for more than a decade. Therefore, nanofibers are a promising solution to address these challenges. These are solid polymer fibers with nanosized diameter, which show improved properties compared to the materials of larger dimensions or forms and therefore cause different biological responses. On the nanometric level, nanofibers provide a biomimetic environment, on the micrometric scale three-dimensional architecture with the desired surface properties regarding the intended application within the body, while on the macrometric scale mechanical strength and physiological acceptability. In the review, the development of nanofibers as tissue scaffolds, modern wound dressings for chronic wound therapy and drug delivery systems is highlighted. Research substantiates the effectiveness of nanofibers for enhanced tissue regeneration, but ascertains that evidences from clinical studies are currently lacking. Nevertheless, due to the development of nano- and bio-sciences, products on the market can be expected in the near future.
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38
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Pelipenko J, Kocbek P, Govedarica B, Rošic R, Baumgartner S, Kristl J. The topography of electrospun nanofibers and its impact on the growth and mobility of keratinocytes. Eur J Pharm Biopharm 2013; 84:401-11. [DOI: 10.1016/j.ejpb.2012.09.009] [Citation(s) in RCA: 64] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2012] [Revised: 09/03/2012] [Accepted: 09/21/2012] [Indexed: 11/26/2022]
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39
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Rošic R, Pelipenko J, Kristl J, Kocbek P, Bešter-Rogač M, Baumgartner S. Physical characteristics of poly (vinyl alcohol) solutions in relation to electrospun nanofiber formation. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2012.11.013] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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