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Smith BT, Hashmi SM. In situ polymer gelation in confined flow controls intermittent dynamics. SOFT MATTER 2024; 20:1858-1868. [PMID: 38315155 DOI: 10.1039/d3sm01389h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Polymer flows through pores, nozzles and other small channels govern engineered and naturally occurring dynamics in many processes, from 3D printing to oil recovery in the earth's subsurface to a wide variety of biological flows. The crosslinking of polymers can change their material properties dramatically, and it is advantageous to know a priori whether or not crosslinking polymers will lead to clogged channels or cessation of flow. In this study, we investigate the flow of a common biopolymer, alginate, while it undergoes crosslinking by the addition of a crosslinker, calcium, driven through a microfluidic channel at constant flow rate. We map the boundaries defining complete clogging and flow as a function of flow rate, polymer concentration, and crosslinker concentration. Interestingly, the boundaries of the dynamic behavior qualitatively match the thermodynamic jamming phase diagram of attractive colloidal particles. That is, polymer clogging occurs in a region analogous to colloids in a jammed state, while the polymer flows in regions corresponding to colloids in a liquid phase. However, between the dynamic regimes of complete clogging and unrestricted flow, we observe a remarkable phenomenon in which the crosslinked polymer intermittently clogs the channel. This pattern of deposition and removal of a crosslinked gel is simultaneously highly reproducible, long-lasting, and controllable by system parameters. Higher concentrations of polymer and cross-linker result in more frequent ablation, while gels formed at lower component concentrations ablate less frequently. Upon ablation, the eluted gel maintains its shape, resulting in micro-rods several hundred microns long. Our results suggest both rich dynamics of intermittent flows in crosslinking polymers and the ability to control them.
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Affiliation(s)
- Barrett T Smith
- Department of Chemical Engineering, Northeastern University, USA.
| | - Sara M Hashmi
- Department of Chemical Engineering, Northeastern University, USA.
- Department of Mechanical & Industrial Engineering, Northeastern University, USA
- Department of Chemistry & Chemical Biology, Northeastern University, USA
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Rył A, Owczarz P. Thermoinduced aggegation of chitosan systems in perikinetic and orthokinetic regimes. Carbohydr Polym 2020; 255:117377. [PMID: 33436208 DOI: 10.1016/j.carbpol.2020.117377] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 10/26/2020] [Accepted: 11/02/2020] [Indexed: 11/25/2022]
Abstract
Thermoresponsive colloidal chitosan systems forming the polymer structure in situ are an example of promising solutions in tissue engineering as an injectable scaffolds or drug carriers. Their application method, and thus shearing, may affect the aggregation process in accordance with the colloidal engineering approach. The aim of the study is to compare the kinetics of chitosan aggregation in the perikinetic regime (limited by Brownian motions) with the orthokinetic process carried out under the influence of an external shear field. The research was carried out using static multiple light scattering (S-MLS) and rheometric measurement techniques coupled with small-angle light scattering (Rheo-SALS). It has been found that the introduction of an external shear field (orthokinetic regime) accelerates the aggregation of chitosan systems. Simultaneously, the rotational measurements can even lead to spontaneous gelation, most likely caused by changes in the conformation of chitosan molecules, their deformation and ordering along the shear field.
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Affiliation(s)
- Anna Rył
- Department of Chemical Engineering, Lodz University of Technology, 90-924, Lodz, Poland
| | - Piotr Owczarz
- Department of Chemical Engineering, Lodz University of Technology, 90-924, Lodz, Poland.
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Owczarz P, Ziółkowski P, Dziubiński M. The Application of Small-Angle Light Scattering for Rheo-Optical Characterization of Chitosan Colloidal Solutions. Polymers (Basel) 2018; 10:E431. [PMID: 30966466 PMCID: PMC6415461 DOI: 10.3390/polym10040431] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2018] [Revised: 04/08/2018] [Accepted: 04/11/2018] [Indexed: 11/16/2022] Open
Abstract
In the recent studies on chitosan hydrogels, it was found that understanding both rheological and structural properties plays an important role in their application. Therefore, a combination of two independent techniques was applied to investigate micro- and macroscopic properties of chitosan colloidal system. Studies on viscous properties, as well as the sol-gel phase transition process, were performed using rheological methods coupled with the small angle light scattering (SALS) technique. Based on the anisotropy of scattering patterns obtained during rotational shear tests, it was found that the chitosan solution reveals two different behaviors delimited by the critical value of the shear rate. Below a critical value, chitosan clusters are deformed without breaking up aggregates, whereas after exceeding a critical value, chitosan clusters apart from deformation also breakup into smaller aggregates. The values of the radius of gyration determined by applying the Debye function allow one to state that with an increase of chitosan concentration, molecule size decreases. An analysis of the light scattering data from the temperature ramp test showed that with an increase of temperature, the level of polymer coil swelling increases. Simultaneously, the supply of thermal energy leads to a neutralization of the charge of chitosan chains. As a consequence, the formation of intermolecular links occurs and a gel structure is formed.
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Affiliation(s)
- Piotr Owczarz
- Department of Chemical Engineering, Lodz University of Technology, 90-924 Lodz, Poland.
| | - Patryk Ziółkowski
- Department of Chemical Engineering, Lodz University of Technology, 90-924 Lodz, Poland.
| | - Marek Dziubiński
- Department of Chemical Engineering, Lodz University of Technology, 90-924 Lodz, Poland.
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Affiliation(s)
- Hongliang Kang
- Laboratory of Polymer Physics and Chemistry; Beijing National Laboratory of Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Ruigang Liu
- Laboratory of Polymer Physics and Chemistry; Beijing National Laboratory of Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
| | - Yong Huang
- Laboratory of Polymer Physics and Chemistry; Beijing National Laboratory of Molecular Sciences; Institute of Chemistry; Chinese Academy of Sciences; Beijing 100190 China
- National Research Center of Engineering Plastics; Technical Institute of Physics & Chemistry; Chinese Academy of Sciences; Beijing 100190 China
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Shangguan Y, Liu M, Luo G, Zheng Q. Shear induced self-thickening of chitosan/β-cyclodextrin compound solution. RSC Adv 2016. [DOI: 10.1039/c6ra24608g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Zepon KM, Otsuka I, Bouilhac C, Muniz EC, Soldi V, Borsali R. Glyco-Nanoparticles Made from Self-Assembly of Maltoheptaose-block-Poly(methyl methacrylate): Micelle, Reverse Micelle, and Encapsulation. Biomacromolecules 2015; 16:2012-24. [DOI: 10.1021/acs.biomac.5b00443] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Karine M. Zepon
- University Grenoble
Alpes, CERMAV, F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, Cedex
9, France
- Departamento
de Química, Universidade Federal de Santa Catarina, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Issei Otsuka
- University Grenoble
Alpes, CERMAV, F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, Cedex
9, France
| | - Cécile Bouilhac
- Institut
Charles Gerhardt Montpellier UMR5253 CNRS-UM-ENSCM, Equipe Ingénierie
et Architectures Macromoléculaires, Université Montpellier, Bâtiment 17−cc1702, Place Eugène Bataillon, 34095 Montpellier, Cedex 5, France
| | - Edvani C. Muniz
- Grupo
de Materiais Poliméricos e Compósitos, GMPC—Departamento
de Química, Universidade Estadual de Maringá, CEP 87020-900, Maringá, Paraná, Brazil
| | - Valdir Soldi
- Departamento
de Química, Universidade Federal de Santa Catarina, CEP 88040-900, Florianópolis, Santa Catarina, Brazil
| | - Redouane Borsali
- University Grenoble
Alpes, CERMAV, F-38000 Grenoble, France
- CNRS, CERMAV, F-38000 Grenoble, Cedex
9, France
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Kodavaty J, Deshpande AP. Regimes of microstructural evolution as observed from rheology and surface morphology of crosslinked poly(vinyl alcohol) and hyaluronic acid blends during gelation. J Appl Polym Sci 2014. [DOI: 10.1002/app.41081] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Jagadeeshwar Kodavaty
- Department of Chemical Engineering; Indian Institute of Technology Madras; Chennai Tamilnadu 600036 India
| | - Abhijit P Deshpande
- Department of Chemical Engineering; Indian Institute of Technology Madras; Chennai Tamilnadu 600036 India
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Dashtimoghadam E, Mirzadeh H, Taromi FA, Nyström B. Thermoresponsive biopolymer hydrogels with tunable gel characteristics. RSC Adv 2014. [DOI: 10.1039/c4ra05246c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Here we describe the design of thermosensitive biopolymer-based hydrogels with adjustable gel properties.
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Affiliation(s)
- Erfan Dashtimoghadam
- Department of Polymer Engineering and Color Technology
- Amirkabir University of Technology
- Tehran, Iran
- Department of Chemistry
- University of Oslo
| | - Hamid Mirzadeh
- Department of Polymer Engineering and Color Technology
- Amirkabir University of Technology
- Tehran, Iran
| | - Faramarz Afshar Taromi
- Department of Polymer Engineering and Color Technology
- Amirkabir University of Technology
- Tehran, Iran
| | - Bo Nyström
- Department of Chemistry
- University of Oslo
- N-0315 Oslo, Norway
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Fortunato E, Barquinha P, Martins R. Oxide semiconductor thin-film transistors: a review of recent advances. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2012; 24:2945-2986. [PMID: 22573414 DOI: 10.1002/adma.201103228] [Citation(s) in RCA: 640] [Impact Index Per Article: 53.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Indexed: 05/26/2023]
Abstract
Transparent electronics is today one of the most advanced topics for a wide range of device applications. The key components are wide bandgap semiconductors, where oxides of different origins play an important role, not only as passive component but also as active component, similar to what is observed in conventional semiconductors like silicon. Transparent electronics has gained special attention during the last few years and is today established as one of the most promising technologies for leading the next generation of flat panel display due to its excellent electronic performance. In this paper the recent progress in n- and p-type oxide based thin-film transistors (TFT) is reviewed, with special emphasis on solution-processed and p-type, and the major milestones already achieved with this emerging and very promising technology are summarizeed. After a short introduction where the main advantages of these semiconductors are presented, as well as the industry expectations, the beautiful history of TFTs is revisited, including the main landmarks in the last 80 years, finishing by referring to some papers that have played an important role in shaping transparent electronics. Then, an overview is presented of state of the art n-type TFTs processed by physical vapour deposition methods, and finally one of the most exciting, promising, and low cost but powerful technologies is discussed: solution-processed oxide TFTs. Moreover, a more detailed focus analysis will be given concerning p-type oxide TFTs, mainly centred on two of the most promising semiconductor candidates: copper oxide and tin oxide. The most recent data related to the production of complementary metal oxide semiconductor (CMOS) devices based on n- and p-type oxide TFT is also be presented. The last topic of this review is devoted to some emerging applications, finalizing with the main conclusions. Related work that originated at CENIMAT|I3N during the last six years is included in more detail, which has led to the fabrication of high performance n- and p-type oxide transistors as well as the fabrication of CMOS devices with and on paper.
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Affiliation(s)
- E Fortunato
- CENIMAT/I3N, Departamento de Ciência dos Materiais, Faculdade de Ciências e Tecnologia, FCT, Universidade Nova de Lisboa and CEMOP-UNINOVA, 2829-516 Caparica, Portugal.
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Preparation and characterization of cross-linked polymeric nanoparticles for enhanced oil recovery applications. J Appl Polym Sci 2009. [DOI: 10.1002/app.30176] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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