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Siebenmorgen C, Wang C, Navarro LB, Parisi D, Misra S, Venkiteswaran VK, van Rijn P. Minimally designed thermo-magnetic dual responsive soft robots for complex applications. J Mater Chem B 2024; 12:5339-5349. [PMID: 38597898 DOI: 10.1039/d3tb02839a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
The fabrication of thermo-magnetic dual-responsive soft robots often requires intricate designs to implement complex locomotion patterns and utilize the implemented responsive behaviors. This work demonstrates a minimally designed soft robot based on poly-N-isopropylacrylamide (pNIPAM) and ferromagnetic particles, showcasing excellent control over both thermo- and magnetic responses. Free radical polymerization enables the magnetic particles to be entrapped homogeneously within the polymeric network. The integration of magnetic shape programming and temperature response allows the robot to perform various tasks including shaping, locomotion, pick-and-place, and release maneuvers of objects using independent triggers. The robot can be immobilized in a gripping state through magnetic actuation, and a subsequent increase in temperature transitions the robot from a swollen to a collapsed state. The temperature switch enables the robot to maintain a secured configuration while executing other movements via magnetic actuation. This approach offers a straightforward yet effective solution for achieving full control over both stimuli in dual-responsive soft robotics.
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Affiliation(s)
- Clio Siebenmorgen
- University of Groningen, University Medical Center Groningen, Biomaterials & Biomedical Technology, Deusinglaan 1, Groningen 9713 AV, The Netherlands.
| | - Chen Wang
- University of Groningen, University Medical Center Groningen, Biomaterials & Biomedical Technology, Deusinglaan 1, Groningen 9713 AV, The Netherlands.
| | - Laurens Bosscher Navarro
- University of Groningen, University Medical Center Groningen, Biomaterials & Biomedical Technology, Deusinglaan 1, Groningen 9713 AV, The Netherlands.
| | - Daniele Parisi
- University of Groningen, Faculty of Science and Engineering, Product Technology - Engineering and Technology Institute Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Sarthak Misra
- University of Groningen, University Medical Center Groningen, Biomaterials & Biomedical Technology, Deusinglaan 1, Groningen 9713 AV, The Netherlands.
- Surgical Robotics Laboratory, Department of Biomechanical Engineering University of Twente, Drienerlolaan 5, 7522 NB Enschede, The Netherlands.
| | | | - Patrick van Rijn
- University of Groningen, University Medical Center Groningen, Biomaterials & Biomedical Technology, Deusinglaan 1, Groningen 9713 AV, The Netherlands.
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Chafran L, Carfagno A. Synthesis of multi-responsive poly(NIPA- co-DMAEMA)-PBA hydrogel nanoparticles in aqueous solution for application as glucose-sensitive insulin-releasing nanoparticles. J Diabetes Metab Disord 2024; 23:1259-1270. [PMID: 38932860 PMCID: PMC11196523 DOI: 10.1007/s40200-024-01421-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Accepted: 03/07/2024] [Indexed: 06/28/2024]
Abstract
Objectives This study aimed to present an innovative method for synthesizing pH-thermo-glucose responsive poly(NIPA-co-DMAEMA)-PBA hydrogel nanoparticles via single-step aqueous free radical polymerization. Methods The synthesis process involved free radical polymerization in an aqueous solution, and the resulting nanoparticles were characterized for their physical and chemical properties by 1H NMR, Dynamic Light Scattering (DLS) and Scanning Electron Microscopy (SEM). Insulin-loaded poly(NIPA-co-DMAEMA)-PBA hydrogel nanoparticles were prepared and evaluated for their insulin capture and release properties at different pH and temperature, in addition to different glucose concentrations, with the release profile of insulin quantitatively evaluated using the Bradford method. Results 1H NMR results confirmed successful PBA incorporation, and DLS outcomes consistently indicated a transition to a more hydrophobic state above the Lower Critical Solution Temperature (LCST) of NIPA and DMAEMA. While pH responsiveness exhibited variation, insulin release generally increased with rising pH from acidic to neutral conditions, aligning with the anticipated augmentation of anionic PBA moieties and increased hydrogel hydrophilicity. Increased insulin release in the presence of glucose, particularly for formulations with the lowest mol % PBA, along with a slight increase for the highest mol % PBA formulation when increasing glucose from 1 to 4 mg/mL, supported the potential of this approach for nanoparticle synthesis tailored for glucose-responsive insulin release. Conclusions This work successfully demonstrates a novel method for synthesizing responsive hydrogel nanoparticles and underscores their potential for controlled insulin release in response to glucose concentrations. The observed pH-dependent insulin release patterns and the influence of PBA content on responsiveness highlight the versatility and promise of this nanoparticle synthesis approach for applications in glucose-responsive drug delivery systems. Graphical abstract Poly(NIPA) nanoparticles containing PBA moieties are normally synthesized in two or more steps in the presence of organic solvents. Here we propose a new method for the synthesis of multiresponsive hydrogel poly(NIPA-co-DMAEMA)-PBA nanoparticles in aqueous medium in a single reaction to provide a fast and effective strategy for the production of glucose-responsive multi-systems in aqueous media from free radical polymerization.
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Affiliation(s)
- Liana Chafran
- Department of Chemistry and Biochemistry, George Mason University, Manassas, VA 20110 USA
| | - Amy Carfagno
- Department of Chemistry and Biochemistry, George Mason University, Manassas, VA 20110 USA
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Chen F, Wu X, Lu G, Nie J, Zhu X. Thermochromic Hydrogels with Adjustable Transition Behavior for Smart Windows. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38593302 DOI: 10.1021/acsami.3c19272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
With the fast economic development and accelerating urbanization, more and more skyscrapers made entirely of concrete and glass are being constructed. To keep a comfortable indoor environment, massive energy for air conditioning or heating appliances is consumed. A huge amount of heat (>30%) is gained or released through glass windows. Using smart windows with the capability to modulate light is an effective way to reduce building energy consumption. Thermochromic hydrogel is one of the potential smart window materials due to its excellent thermal response, high radiation-blocking efficiency, cost-effectiveness, biocompatibility, and good uniformity. In this work, polyhydroxypropyl acrylate (PHPA) hydrogels with controllable lower critical solution temperature (LCST) were prepared by photopolymerization. The transition temperature and transition rate under "static transition" conditions were investigated. Unlike "static" conditions in which the transition temperature was not affected by the initial and final temperature and heating/cooling ramp, the transition temperature varied with the rate of temperature change under dynamic conditions. The "dynamic" transition temperature of the PHPA hydrogel gradually increased with the increase of the heating rate. It was the result of the movement of the molecular chains lagging behind the temperature change when the temperature change was too fast. The results of the solar irradiation experiment by filling PHPA hydrogels into double glazing windows showed that the indoor temperature was about 15 °C lower than that of ordinary glass windows, indicating that it can significantly reduce the energy consumption of air conditioning. In addition, a wide range of adjustable transition temperatures and fast optical response make PHPA hydrogels potentially applicable to smart windows.
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Affiliation(s)
- Fuping Chen
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xuewei Wu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Guoqiang Lu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Jun Nie
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
| | - Xiaoqun Zhu
- State Key Laboratory of Chemical Resource Engineering, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
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Zhou J, Shi D, Kaneko T, Dong W, Chen M. Regulating Electrostatic Interactions toward Thermoresponsive Hydrogels with Low Critical Solution Temperature. Macromol Rapid Commun 2024; 45:e2300488. [PMID: 37793367 DOI: 10.1002/marc.202300488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Revised: 09/18/2023] [Indexed: 10/06/2023]
Abstract
Low critical solution temperature (LCST) of commonly used thermoresponsive polymers in water is basically dominated by hydrophobic interactions. Herein, a novel thermoresponsive system based on electrostatic interactions is reported. By simply loading aluminum chloride (AlCl3 ) into non-responsive poly(2-hydroxyethyl acrylate) (PHEA) hydrogels, PHEA-Al gels turn to have reversible thermoresponsive behavior between transparent and opaque without any volume change. Further investigations by changing metal ion-polymer compositions unravel the necessity of specific electrostatic interactions, namely, cation-dipole bonding interactions between hydroxy groups and trivalent metal ions. The thermoresponsive hydrogel demonstrates high transparency (≈95%), excellent luminous modulation capability (>98%), and cyclic reliability, suggesting great potential as an energy-saving material. Although LCST control by salt addition is widely known, salt-induced expression of thermoresponsiveness has barely been discussed before. This design provides a new approach of easy fabrication, low cost, and scalability to develop stimuli-responsive materials.
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Affiliation(s)
- Jiahua Zhou
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China
| | - Dongjian Shi
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China
| | - Tatsuo Kaneko
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China
| | - Weifu Dong
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China
| | - Mingqing Chen
- The Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi, 214122, P. R. China
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Hosseini-Alvand E, Khorasani MT. Fabrication of electrospun nanofibrous thermoresponsive semi-interpenetrating poly( N-isopropylacrylamide)/polyvinyl alcohol networks containing ZnO nanoparticle mats: characterization and antibacterial and cytocompatibility evaluation. J Mater Chem B 2023; 11:890-904. [PMID: 36597765 DOI: 10.1039/d2tb02179j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Thermoresponsive nanofiber composites comprising biopolymers and ZnO nanoparticles with controlled release and antibacterial activity are fascinating scientific research areas. Herein, poly(N-isopropylacrylamide) (PNIPAm) was prepared and mixed with poly(vinyl alcohol) (PVA) in 75/25 and 50/50 weight ratios together with ZnO (0, 1, and 2 phr) to construct nanofiber composites. The morphology of the crosslinked nanofiber composites, ZnO content, and their mechanical behavior were assessed by SEM, EDX, and tensile analyses. The wettability results show an increment in nanofiber surface hydrophobicity by increasing the temperature above the LCST of PNIPAm. The in vitro ZnO release exhibits a faster release profile for the sample with 50 wt% PNIPAm (lower crosslinking density) compared to the one with 25 wt%. Besides, a strong interaction between PVA hydroxyl groups and ZnO can restrict the release content. However, by increasing the temperature from 28 to 32 °C, the relative ZnO release becomes half for both compositions. All crosslinked nanofiber composites demonstrated reliable biocompatibility against L929 fibroblast cells. Agar disc-diffusion and optical density methods showed thermo-controllable antibacterial activity against Staphylococcus aureus upon temperature variation between 28 and 32 °C. Furthermore, in vivo and histological results indicate the potentiality of the prepared multidisciplinary wound dressing for robust wound healing and skin tissue engineering.
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Affiliation(s)
- Ebrahim Hosseini-Alvand
- Biomaterial Department, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran.
| | - Mohammad-Taghi Khorasani
- Biomaterial Department, Iran Polymer and Petrochemical Institute, P.O. Box 14965/115, Tehran, Iran.
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Nagase K, Ishii S, Takeuchi A, Kanazawa H. Temperature-modulated antibody drug separation using thermoresponsive mixed polymer brush-modified stationary phase. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Guerron A, Phan HT, Peñaloza-Arias C, Brambilla D, Roullin VG, Giasson S. Selectively triggered cell detachment from poly(N-isopropylacrylamide) microgel functionalized substrates. Colloids Surf B Biointerfaces 2022. [DOI: 10.1016/j.colsurfb.2022.112699] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Wang S, Li J, Pan Y, Liu F, Zeng L, Gao Y, Lu T. A double-network strategy for the tough tissue adhesion of hydrogels with long-term stability under physiological environment. SOFT MATTER 2022; 18:6192-6199. [PMID: 35856647 DOI: 10.1039/d2sm00688j] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Achieving tough and stable tissue adhesion under a physiological environment is of great significance for the clinical applications of hydrogel adhesives. The current tough hydrogel adhesives face challenges in the preservation of the maximal adhesion for a long time due to swelling. Here, we propose a double-network strategy for tough tissue adhesion by a hydrogel with long-term stability under a physiological environment. A double-network hydrogel consisting of a covalently crosslinked primary network with tunable hydrophilicity and a non-covalently crosslinked secondary network with functional groups is designed. The primary network exhibited hydrophobicity in the physiological environment, which could constrict the secondary network and limit the swelling of the entire hydrogel. The secondary network could form strong interlinks with tissue and provide large energy dissipation through the unzipping of its noncovalent crosslinks when separated by a force. The combination of the two networks resulted in a tough and stable tissue adhesion. A poly(N-isopropylacrylamide)/calcium alginate hydrogel synthesized based on this strategy realized an adhesion energy of 300-500 J m-2 with porcine tissues, and the maximal adhesion could be maintained for over 1000 min after submerging in a PBS solution at 37 °C. The swelling behavior of the hydrogel and changes in mechanical properties under the physiological environment are studied, and its application in repairing the aorta wound is demonstrated.
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Affiliation(s)
- Shuyang Wang
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Jieru Li
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Yudong Pan
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Fengkai Liu
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Liangsong Zeng
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Yang Gao
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
| | - Tongqing Lu
- State Key Lab for Strength and Vibration of Mechanical Structures, Soft Machines Lab, School of Aerospace Engineering, Xi'an Jiaotong University, Xi'an 710049, China.
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Park H, Baek S, Kang H, Lee D. Biomaterials to Prevent Post-Operative Adhesion. MATERIALS (BASEL, SWITZERLAND) 2020; 13:E3056. [PMID: 32650529 PMCID: PMC7412384 DOI: 10.3390/ma13143056] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Revised: 06/28/2020] [Accepted: 07/03/2020] [Indexed: 02/07/2023]
Abstract
Surgery is performed to treat various diseases. During the process, the surgical site is healed through self-healing after surgery. Post-operative or tissue adhesion caused by unnecessary contact with the surgical site occurs during the normal healing process. In addition, it has been frequently found in patients who have undergone surgery, and severe adhesion can cause chronic pain and various complications. Therefore, anti-adhesion barriers have been developed using multiple biomaterials to prevent post-operative adhesion. Typically, anti-adhesion barriers are manufactured and sold in numerous forms, such as gels, solutions, and films, but there are no products that can completely prevent post-operative adhesion. These products are generally applied over the surgical site to physically block adhesion to other sites (organs). Many studies have recently been conducted to increase the anti-adhesion effects through various strategies. This article reviews recent research trends in anti-adhesion barriers.
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Affiliation(s)
- Heekyung Park
- Department of Biomedical Engineering, School of Integrative Engineering, Chung-Ang University, 221 Heukseok-Dong, Dongjak-Gu, Seoul 06974, Korea; (H.P.); (S.B.)
| | - Seungho Baek
- Department of Biomedical Engineering, School of Integrative Engineering, Chung-Ang University, 221 Heukseok-Dong, Dongjak-Gu, Seoul 06974, Korea; (H.P.); (S.B.)
| | - Hyun Kang
- Department of Anesthesiology and Pain Medicine, Chung-Ang University College of Medicine and Graduate School of Medicine, Seoul 06973, Korea
| | - Donghyun Lee
- Department of Biomedical Engineering, School of Integrative Engineering, Chung-Ang University, 221 Heukseok-Dong, Dongjak-Gu, Seoul 06974, Korea; (H.P.); (S.B.)
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10
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Role of molecular architecture in the modulation of hydrophobic interactions. Curr Opin Colloid Interface Sci 2020. [DOI: 10.1016/j.cocis.2019.12.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Gao H, Kam C, Chou TY, Wu MY, Zhao X, Chen S. A simple yet effective AIE-based fluorescent nano-thermometer for temperature mapping in living cells using fluorescence lifetime imaging microscopy. NANOSCALE HORIZONS 2020; 5:488-494. [PMID: 32118250 DOI: 10.1039/c9nh00693a] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
We designed and synthesized a novel nano-thermometer using aggregation-induced-emission (AIE) dye as the reporter and household butter as the matrix. This temperature nanosensor showed decreased fluorescence intensities (∼2%/°C) and shorter fluorescence lifetimes (∼0.11 ns/°C) upon increasing the environmental temperature in the physiological temperature range. Such fluorescence responses were reversible and independent of the environmental pH and ionic strength. The application of these nano-thermometers in temperature sensing in living cells using fluorescence lifetime imaging microscopy (FLIM) was also demonstrated. To the best of our knowledge, this is the first example of AIE-based nano-thermometer for temperature sensing in living cells. This work also provides us with a simple and low-cost method for rapid fabrication of an effective nanosensor based on AIE mechanism.
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Affiliation(s)
- Hui Gao
- Ming Wai Lau Centre for Reparative Medicine, Karolinska Institutet, Hong Kong, China. and School of Aeronautic Science and Engineering, Beihang University, Beijing, China
| | - Chuen Kam
- Ming Wai Lau Centre for Reparative Medicine, Karolinska Institutet, Hong Kong, China.
| | - Tsu Yu Chou
- Ming Wai Lau Centre for Reparative Medicine, Karolinska Institutet, Hong Kong, China.
| | - Ming-Yu Wu
- Ming Wai Lau Centre for Reparative Medicine, Karolinska Institutet, Hong Kong, China. and School of Life Science and Engineering, Southwest Jiaotong University, Chengdu 610031, China
| | - Xin Zhao
- Department of Biomedical Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Sijie Chen
- Ming Wai Lau Centre for Reparative Medicine, Karolinska Institutet, Hong Kong, China.
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Bodiou V, Moutsatsou P, Post MJ. Microcarriers for Upscaling Cultured Meat Production. Front Nutr 2020; 7:10. [PMID: 32154261 PMCID: PMC7045063 DOI: 10.3389/fnut.2020.00010] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 01/28/2020] [Indexed: 12/19/2022] Open
Abstract
Due to the considerable environmental impact and the controversial animal welfare associated with industrial meat production, combined with the ever-increasing global population and demand for meat products, sustainable production alternatives are indispensable. In 2013, the world's first laboratory grown hamburger made from cultured muscle cells was developed. However, coming at a price of $300.000, and being produced manually, substantial effort is still required to reach sustainable large-scale production. One of the main challenges is scalability. Microcarriers (MCs), offering a large surface/volume ratio, are the most promising candidates for upscaling muscle cell culture. However, although many MCs have been developed for cell lines and stem cells typically used in the medical field, none have been specifically developed for muscle stem cells and meat production. This paper aims to discuss the MCs' design criteria for skeletal muscle cell proliferation and subsequently for meat production based on three scenarios: (1) MCs are serving only as a temporary substrate for cell attachment and proliferation and therefore they need to be separated from the cells at some stage of the bioprocess, (2) MCs serve as a temporary substrate for cell proliferation but are degraded or dissolved during the bioprocess, and (3) MCs are embedded in the final product and therefore need to be edible. The particularities of each of these three bioprocesses will be discussed from the perspective of MCs as well as the feasibility of a one-step bioprocess. Each scenario presents advantages and drawbacks, which are discussed in detail, nevertheless the third scenario appears to be the most promising one for a production process. Indeed, using an edible material can limit or completely eliminate dissociation/degradation/separation steps and even promote organoleptic qualities when embedded in the final product. Edible microcarriers could also be used as a temporary substrate similarly to scenarios 1 and 2, which would limit the risk of non-edible residues.
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Affiliation(s)
- Vincent Bodiou
- Department of Physiology, Faculty of Health, Medicine and Life Sciences, School for Cardiovascular Diseases, Maastricht University, Maastricht, Netherlands
- Mosa Meat BV, Maastricht, Netherlands
- CARIM, Faculty of Health, Medicine and Life Sciences, School for Cardiovascular Diseases, Maastricht University, Maastricht, Netherlands
| | - Panagiota Moutsatsou
- Department of Physiology, Faculty of Health, Medicine and Life Sciences, School for Cardiovascular Diseases, Maastricht University, Maastricht, Netherlands
- Mosa Meat BV, Maastricht, Netherlands
| | - Mark J. Post
- Department of Physiology, Faculty of Health, Medicine and Life Sciences, School for Cardiovascular Diseases, Maastricht University, Maastricht, Netherlands
- Mosa Meat BV, Maastricht, Netherlands
- CARIM, Faculty of Health, Medicine and Life Sciences, School for Cardiovascular Diseases, Maastricht University, Maastricht, Netherlands
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Qian S, Liu R, Han G, Shi K, Zhang W. Star amphiphilic block copolymers: synthesis via polymerization-induced self-assembly and crosslinking within nanoparticles, and solution and interfacial properties. Polym Chem 2020. [DOI: 10.1039/c9py01656b] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The star amphiphilic block copolymer of star s-PNIPAM-b-PS is synthesized and it shows characteristics significantly different from those of the linear block copolymer counterpart.
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Affiliation(s)
- Sijia Qian
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Rui Liu
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Guang Han
- State Key Laboratory of Special Functional Waterproof Materials
- Beijing Oriental Yuhong Waterproof Technology Co
- Ltd
- Beijing 100123
- China
| | - Keyu Shi
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education
- Institute of Polymer Chemistry
- College of Chemistry
- Nankai University
- Tianjin 300071
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van Duinen D, Butt HJ, Berger R. Two-Stage Collapse of PNIPAM Brushes: Viscoelastic Changes Revealed by an Interferometric Laser Technique. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15776-15783. [PMID: 31633361 PMCID: PMC6943814 DOI: 10.1021/acs.langmuir.9b03205] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 10/21/2019] [Indexed: 06/10/2023]
Abstract
Many temperature-responsive polymers exhibit a single-phase transition at the lower critical solution temperature (LCST). One exception is poly(N-isopropylacryamide) (PNIPAM). PNIPAM brush layers (51 ± 3 nm thick) that are end-grafted onto glass beads collapse in two stages. The viscoelastic changes of a PNIPAM brush layers were investigated with an interferometric laser method at different temperatures. This method is able to measure the two-stage collapse of beads coated with a polymer brush layer. When these beads are situated close to a hydrophilic glass surface, they exhibit Brownian motion. As this Brownian motion changes with temperature, the collapse of the polymer layer is revealed. The characteristic spectrum of the Brownian motion of beads is modeled by a damped harmonic oscillator, where the polymer layer acts as both spring and damping elements. The change of the Brownian motion spectrum with temperature indicates two transitions of the PNIPAM brush layer, one at 36 °C and one at 46 °C. We attribute the first transition to the LCST volume collapse of PNIPAM. Here, changes of the density and viscosity of the brush dominate. The second transition is dominated by a stiffening of the brush layer.
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Liu S, Zheng C, Ye Z, Blanc B, Zhi X, Shi L, Zhang Z. Filamentous Viruses Grafted with Thermoresponsive Block Polymers: Liquid Crystal Behaviors of a Rodlike Colloidal Model with “True” Attractive Interactions. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b00674] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Shuaiyu Liu
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 300071 Tianjin, China
| | - Chunxiong Zheng
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 300071 Tianjin, China
| | - Zihan Ye
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 300071 Tianjin, China
| | - Baptiste Blanc
- Department of Physics, Brandeis University, Waltham, Massachusetts 02453, United States
| | - Xueli Zhi
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 300071 Tianjin, China
| | - Linqi Shi
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 300071 Tianjin, China
| | - Zhenkun Zhang
- Key Laboratory of Functional Polymer Materials of Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, 300071 Tianjin, China
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Sung Ng W, Connal LA, Forbes E, Mohanarangam K, Franks GV. In situ study of aggregate sizes formed in chalcopyrite-quartz mixture using temperature-responsive polymers. ADV POWDER TECHNOL 2018. [DOI: 10.1016/j.apt.2018.04.027] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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17
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Protein valves formed through click-reaction grafting of poly(N-isopropylacrylamide) onto electrospun poly(2,6-dimethyl-1,4-phenylene oxide) fibrous membranes. J Memb Sci 2018. [DOI: 10.1016/j.memsci.2018.01.024] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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18
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Guo JW, Lin ZY, Huang BR, Lu CH, Chen JK. Antigen detection with thermosensitive hydrophilicity of poly(N-isopropylacrylamide)-grafted poly(vinyl chloride) fibrous mats. J Mater Chem B 2018; 6:3486-3496. [DOI: 10.1039/c8tb00870a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The static water contact angle of stimuli-responsive fibrous mats is used as a convenient index for rapid antigen detection.
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Affiliation(s)
- Jian-Wei Guo
- School of Chemical Engineering & Light Industry
- Guangdong University of Technology
- Guangzhou
- China
- Department of Materials Science and Engineering
| | - Zhen-Yu Lin
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei 106
- Republic of China
| | - Bohr-Ran Huang
- Graduate Institute of Electro-Optical Engineering and Department of Electronic Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
| | - Chien-Hsing Lu
- Department of Obstetrics and Gynecology
- Taichung Veterans General Hospital
- Taichung
- Taiwan
- Department of Obstetrics and Gynecology
| | - Jem-Kun Chen
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei 106
- Republic of China
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19
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Fabrication of device with poly(N-isopropylacrylamide)-b-ssDNA copolymer brush for resistivity study. J Nanobiotechnology 2017; 15:68. [PMID: 28982368 PMCID: PMC5629771 DOI: 10.1186/s12951-017-0303-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Accepted: 09/23/2017] [Indexed: 11/10/2022] Open
Abstract
In this study, we grafted bromo-terminated poly(N-isopropylacrylamide) (PNIPAAm) brushes onto thin gold films deposited on silicon, and then reacted with NaN3 to produce azido-terminated PNIPAAm brushes. A probe sequence of single-stranded DNA (ssDNA) with a 4-pentynoic acid succinimidyl ester unit was grafted onto the azido-terminated PNIPAAm brushes through a click reaction, resulting in the formation of block copolymer brushes. The PNIPAAm-b-ssDNA copolymer brushes formed supramolecular complexes stabilized by bio-multiple hydrogen bonds (BMHBs), which enhanced the proton transfer and thereby decreased the resistivity of the structures. In addition, the optimal operation window for DNA detection ranges from 0 to 0.2 M of NaCl concentration. Therefore, the specimens were prepared in the PBS solution at 150 mM NaCl concentration for target hybridization. The supramolecular complex state of the PNIPAAm-b-ssDNA copolymer brushes transformed into the phase-separated state after the hybridization with 0.5 ng/µL of its target DNA sequence owing to the competition between BMHBs and complementary hydrogen bonds. This phase transformation of the PNIPAAm and probe segments inhibited the proton transfer and significantly increased the resistivity at 25 °C. Moreover, there were no significant changes in the resistivity of the copolymer brushes after hybridization with the target sequence at 45 °C. These results indicated that the phase-separated state of the PNIPAAm-b-ssDNA copolymer brushes, which was generally occurred above the LCST, can be substantially generated after hybridization with its target DNA sequence. By performing the controlled experiments, in the same manner, using another sequence with lengths similar to that of the target sequence without complementarity. In addition, the sequences featuring various degrees of complementarity were exploited to verify the phase separation behavior inside the PNIPAAm-b-ssDNA copolymer thin film.
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20
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Bogacz W, Lemanowicz M, Gierczycki A, Mielańczyk A. Flocculation of flotation tailings using thermosensitive polymers. CHEMICAL AND PROCESS ENGINEERING 2017. [DOI: 10.1515/cpe-2017-0029] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Abstract
The key feature of thermosensitive polymers is the reversible transition between the hydrophilic and hydrophopic forms depending on the temperature. Although the main research efforts are focused on their application in different kinds of drug delivery systems, this phenomenon also allows one to precisely control the stability of solid-liquid dispersions. In this paper research on the application of poly(N-isopropylacrylamide) copolymers in processing of minerals is presented. In the experiments tailings from flotation plant of one of the coal mines of Jastrzębska Spółka Węglowa S.A. (Poland) were used. A laser particle sizer Fritsch Analysette 22 was used in order to determine the Particle Size Distribution (PSD). It was proved that there are some substantial issues associated with the application of thermosensitive polymers in industrial practice which may exclude them from the common application. High salinity of suspension altered the value of Lower Critical Solution Temperature (LCST). Moreover, the co-polymers used in research proved to be efficient flocculating agents without any temperature rise. Finally, the dosage needed to achieve steric stabilization of suspension was greatly beyond economic justification.
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21
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Li S, Liao Y, Li G, Li Z, Cao Y. Flocculating and dewatering performance of hydrophobic and hydrophilic solids using a thermal-sensitive copolymer. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:694-704. [PMID: 28759451 DOI: 10.2166/wst.2017.260] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Thermal-sensitive polymers have been tested on settling, compacting or dewatering of clays or oil sand tailings. However, not much attention has been paid to explore the effect of temperature on flocculating performance using thermal-sensitive polymers. In this study, poly(NIPAM-co-DMAPMA) was synthesized and employed to investigate the flocculating and re-flocculating performance of hydrophilic and hydrophobic particles at two specific temperatures; meanwhile settling and dewatering behaviors were also investigated. The results demonstrated that good flocculating performances were achieved at both room temperature (∼23 °C) and lower critical solution temperature (45 °C). Furthermore, larger flocs were formed at 45 °C as the copolymer was added. Floc strength and re-flocculating ability of the flocs were also intensified prominently at 45 °C. Additionally, settling and dewatering rates of suspensions were improved, and the moisture of filtered cakes was reduced when suspensions were at 45 °C. The phenomena could be justified by the phase transition of the copolymer from hydrophilicity to hydrophobicity as the temperature increased. There were much stronger adhesion forces between particles and higher adsorption amount of the copolymer onto solid surfaces at 45 °C. Therefore, the copolymer may be promising in solid-liquid separation to improve the floc size, floc strength, and settling and dewatering rate to achieve much lower moisture filtered cake.
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Affiliation(s)
- Shulei Li
- School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China; National Engineering Research Center of Coal Preparation and Purification, Xuzhou, Jiangsu 221116, China E-mail:
| | - Yinfei Liao
- National Engineering Research Center of Coal Preparation and Purification, Xuzhou, Jiangsu 221116, China E-mail:
| | - Guosheng Li
- School of Chemical Engineering and Technology, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
| | - Zhen Li
- School of Chemistry and Chemical Engineering, Xi'an University of Science and Technology, Xi'an, Shaanxi 710054, China and Key Laboratory of Coal Processing and Efficient Utilization of Ministry of Education, China University of Mining & Technology, Xuzhou, Jiangsu 221116, China
| | - Yijun Cao
- National Engineering Research Center of Coal Preparation and Purification, Xuzhou, Jiangsu 221116, China E-mail:
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22
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Manivannan K, Cheng CC, Chen JK. Facile Synthesis of Poly (N
-isopropylacrylamide) Coated SiO2
Core-shell Microspheres via
Surface-initiated Atom Transfer Radical Polymerization for H2
O2
Biosensor Applications. ELECTROANAL 2017. [DOI: 10.1002/elan.201600755] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- K. Manivannan
- Department of Materials Science and Engineering; National Taiwan University of Science and Technology, 43, Sec 4; Keelung Rd Taipei 106 Taiwan, R.O.C
| | - C.-C. Cheng
- Graduate Institute of Applied Science and Technology; National Taiwan University of Science and Technology; Taipei Taiwan, R.O.C
| | - J.-K. Chen
- Department of Materials Science and Engineering; National Taiwan University of Science and Technology, 43, Sec 4; Keelung Rd Taipei 106 Taiwan, R.O.C
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23
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Ng WS, Connal LA, Forbes E, Mohanarangam K, Franks GV. In situ investigation of aggregate sizes formed using thermo-responsive polymers: Effect of temperature and shear. J Colloid Interface Sci 2017; 494:139-152. [PMID: 28157632 DOI: 10.1016/j.jcis.2017.01.067] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Revised: 01/19/2017] [Accepted: 01/19/2017] [Indexed: 01/30/2023]
Abstract
Temperature-responsive flocculants, such as poly(N-isopropylacrylamide) (PNIPAM), induce reversible particle aggregation upon heating above a lower critical solution temperature (LCST). The aim of this work is to investigate the aggregation of ground iron ore using PNIPAM and conventional polyacrylamide (PAM) flocculants in a continuously-sheared suspension, through in situ chord length measurements using Focused Beam Reflectance Measurement techniques and real-time imaging of the particle aggregates. In the presence of uncharged PNIPAM, particle aggregation occurs only upon heating to the LCST, and the aggregates continue to grow with further heating. Subsequent cooling re-disperses the aggregates, and repeated heating causes reformation. Unlike uncharged PNIPAM, anionic PNIPAM produces aggregates at temperatures below the LCST due to the polymer chains binding to two different particles via attractive interactions between the acrylic acid groups and the hematite surfaces, and can be added at temperatures above the LCST due to the formation of charge-stabilised micelles. Under continuous shear, the flocculant most able to resist aggregate size reduction was anionic PAM, followed by PAM, anionic PNIPAM, PNIPAM (6MDa), and PNIPAM (122kDa). Reversible aggregate breakage was found with all samples, except with PNIPAM (6MDa) after being subjected to shear rates above 550s-1. Furthermore, heating of the PNIPAM-dosed suspensions at shear rates below 200s-1 produced larger and more breakage-resistant aggregates.
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Affiliation(s)
- Wei Sung Ng
- Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC 3010, Australia; CSIRO Mineral Resources, Clayton, VIC 3168, Australia.
| | - Luke A Connal
- Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC 3010, Australia.
| | | | | | - George V Franks
- Chemical and Biomolecular Engineering, University of Melbourne, Parkville, VIC 3010, Australia.
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24
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Liu YZ, Manivannan K, Lee AW, Huang YJ, Wei PL, Chen JK. Identification of DNA single-base mismatches by resistivity of poly(N-isopropylacrylamide)-block-ssDNA copolymer brush films at dual temperatures. RSC Adv 2017. [DOI: 10.1039/c6ra28270a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The resistivity of tethered PNIPAAm-b-ssDNA copolymer brushes can be exploited to detect a label-free target by homogeneous complexation and phase separation.
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Affiliation(s)
- Yi-Zu Liu
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
| | - Karthikeyan Manivannan
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
| | - Ai-Wei Lee
- Department of Anatomy and Cell Biology
- School of Medicine
- College of Medicine
- Taipei Medical University
- Taipei 110
| | - Yan-Jiun Huang
- Department of Surgery
- College of Medicine
- Division of Colorectal Surgery
- Taipei Medical University Hospital
- Taipei Medical University
| | - Po-Li Wei
- Cancer Center
- Division of General Surgery
- Department of Surgery
- Taipei Medical University Hospital
- College of Medicine
| | - Jem-Kun Chen
- Department of Materials Science and Engineering
- National Taiwan University of Science and Technology
- Taipei
- Republic of China
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25
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Manivannan K, Huang YS, Huang BR, Huang CF, Chen JK. Real-Time Packing Behavior of Core-Shell Silica@Poly(N-isopropylacrylamide) Microspheres as Photonic Crystals for Visualizing in Thermal Sensing. Polymers (Basel) 2016; 8:E428. [PMID: 30974704 PMCID: PMC6431998 DOI: 10.3390/polym8120428] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 11/29/2016] [Accepted: 12/06/2016] [Indexed: 12/22/2022] Open
Abstract
We grafted thermo-responsive poly(N-isopropylacrylamide) (PNIPAM) brushes from monodisperse SiO₂ microspheres through surface-initiated atom transfer radical polymerization (SI ATRP) to generate core-shell structured SiO₂@PNIPAM microspheres (SPMs). Regular-sized SPMs dispersed in aqueous solution and packed as photonic crystals (PCs) in dry state. Because of the microscale of the SPMs, the packing behavior of the PCs in water can be observed by optical microscopy. By increasing the temperature above the lower critical solution temperature (LCST) of PNIPAM, the reversible swelling and shrinking of the PNIPAM shell resulted in dispersion and precipitation (three-dimensional aggregation) of the SPM in aqueous solution. The SPMs were microdispersed in a water layer to accommodate the aggregation along two dimensions. In the microdispersion, the SPMs are packed as PCs with microscale spacing between SPMs below the LCST. When the temperature is increased above the LCST, the microdispersed PCs exhibited a close-packed arrangement along two dimensions with decreased spacing between SPMs. The change in spacing with increasing temperature above the LCST resulted in a color change from red to blue, which could be observed by the naked eye at an incident angle. Thus, the SPM array could be applied as a visual temperature sensor.
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Affiliation(s)
- Karthikeyan Manivannan
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Road, Taipei 106, Taiwan.
| | - Yi-Shen Huang
- Department of Chemical Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan.
| | - Bohr-Ran Huang
- Graduate Institute of Electro-Optical Engineering and Department of Electronic Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Road, Taipei 106, Taiwan.
| | - Chih-Feng Huang
- Department of Chemical Engineering, National Chung Hsing University, 250 Kuo Kuang Road, Taichung 402, Taiwan.
| | - Jem-Kun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Road, Taipei 106, Taiwan.
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26
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Lin X, Nguyen Quoc B, Ulbricht M. Magnetoresponsive Poly(ether sulfone)-Based Iron Oxide cum Hydrogel Mixed Matrix Composite Membranes for Switchable Molecular Sieving. ACS APPLIED MATERIALS & INTERFACES 2016; 8:29001-29014. [PMID: 27670686 DOI: 10.1021/acsami.6b09369] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Stimuli-responsive membranes that can adjust mass transfer and interfacial properties "on demand" have drawn large interest over the last few decades. Here, we designed and prepared a novel magnetoresponsive separation membrane with remote switchable molecular sieving effect by simple one-step and scalable nonsolvent induced phase separation (NIPS) process. Specifically, poly(ether sulfone) (PES) as matrix for an anisotropic membrane, prefabricated poly(N-isopropylacrylamide) (PNIPAAm) nanogel (NG) particles as functional gates, and iron oxide magnetic nanoparticles (MNP) as localized heaters were combined in a synergistic way. Before membrane casting, the properties of the building blocks, including swelling property and size distribution for NG, and magnetic property and heating efficiency for MNP, were investigated. Further, to identify optimal film casting conditions for membrane preparation by NIPS, in-depth rheological study of the effects of composition and temperature on blend dope solutions was performed. At last, a composite membrane with 10% MNP and 10% NG blended in a porous PES matrix was obtained, which showed a large, reversible, and stable magneto-responsivity. It had 9 times higher water permeability at the "on" state of alternating magnetic field (AMF) than at the "off"-state. Moreover, the molecular weight cutoff of such membrane could be reversibly shifted from ∼70 to 1750 kDa by switching off or on the external AMF, as demonstrated in dextran ultrafiltration tests. Overall, it has been proved that the molecular sieving performance of the novel mixed matrix composite membrane can be controlled by the swollen/shrunken state of PNIPAAm NG embedded in the nanoporous barrier layer of a PES-based anisotropic porous matrix, via the heat generation of nearby MNP. And the structure of such membrane can be tailored by the NIPS process conditions. Such membrane has potential as enabling material for remote-controlled drug release systems or devices for tunable fractionations of biomacromolecule/-particle mixtures.
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Affiliation(s)
- Xi Lin
- Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany
- Center for Nanointegration Duisburg-Essen , 47057 Duisburg, Germany
| | - Bao Nguyen Quoc
- Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany
- Center for Nanointegration Duisburg-Essen , 47057 Duisburg, Germany
| | - Mathias Ulbricht
- Lehrstuhl für Technische Chemie II, Universität Duisburg-Essen , 45117 Essen, Germany
- Center for Nanointegration Duisburg-Essen , 47057 Duisburg, Germany
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27
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Mahalik JP, Sumpter BG, Kumar R. Vertical Phase Segregation Induced by Dipolar Interactions in Planar Polymer Brushes. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01138] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Jyoti P. Mahalik
- Computer
Science and Mathematics
Division and Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Bobby G. Sumpter
- Computer
Science and Mathematics
Division and Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Rajeev Kumar
- Computer
Science and Mathematics
Division and Center for Nanophase Materials
Sciences, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
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28
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Gong Z, Li S, Ma J, Zhang X. Self-flocculated powdered activated carbon with different oxidation methods and their influence on adsorption behavior. JOURNAL OF HAZARDOUS MATERIALS 2016; 304:222-232. [PMID: 26551226 DOI: 10.1016/j.jhazmat.2015.10.039] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2015] [Revised: 10/15/2015] [Accepted: 10/19/2015] [Indexed: 06/05/2023]
Abstract
The commercial powdered activated carbon (PAC) has been selectively oxidized by two methods. The two oxidized methods are wet oxidation with ammonium persulfate and thermal treatment after acidification with hydrochloride acid, respectively. The two oxidized PAC were then functionalized with thermoresponsive poly (N-isopropylacrylamide) (PNIPAM) in aqueous solution at ambient temperature. Comparing the two oxidized PAC products and their grafted derivatives, the oxidized PAC modified with thermal treatment after acidification shows larger surface area of 1184 m(2)/g and better adsorption of bisphenol A. Its derivative also exhibits relatively large surface area and adsorption capacity after grafted with PNIPAM. The maximum surface adsorption capacity simulated under Langmuir Models reached 156 mg/g. In addition, the grafted PAC products show self-flocculation behaviors with rapid response to temperature because of the thermal phase transition and entanglement behaviors of PNIPAM. The present study provides a new way to obtain carboxyl-rich activated carbon with large surface area and better adsorption capacity. The retrievable grafted PAC with good self-flocculation effect responsive to temperature will have high potential application in water remediation which requires pre-heating and emergency water treatment in the wild.
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Affiliation(s)
- Zailin Gong
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Heilongjiang Province, Harbin 150001, China
| | - Shujin Li
- College of Chemistry, Liaoning University, Liaoning Province, Shenyang 110000, China
| | - Jun Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Heilongjiang Province, Harbin 150001, China.
| | - Xiangdong Zhang
- College of Chemistry, Liaoning University, Liaoning Province, Shenyang 110000, China.
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29
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Gong Z, Li S, Ma J, Zhang X. Synthesis of recyclable powdered activated carbon with temperature responsive polymer for bisphenol A removal. Sep Purif Technol 2016. [DOI: 10.1016/j.seppur.2015.11.040] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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30
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Li H, Zhou J, Chow R, Adegoroye A, Najafi AS. Enhancing treatment and geotechnical stability of oil sands fine tailings using thermo-sensitive poly(n-isopropyl acrylamide). CAN J CHEM ENG 2015. [DOI: 10.1002/cjce.22276] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Haihong Li
- Alberta Innovates - Technology Futures; Edmonton; AB Canada
| | - Joe Zhou
- Alberta Innovates - Technology Futures; Edmonton; AB Canada
| | - Ross Chow
- Alberta Innovates - Technology Futures; Edmonton; AB Canada
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31
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Beattie DA, Addai-Mensah J, Beaussart A, Franks GV, Yeap KY. In situ particle film ATR FTIR spectroscopy of poly (N-isopropyl acrylamide) (PNIPAM) adsorption onto talc. Phys Chem Chem Phys 2015; 16:25143-51. [PMID: 25330994 DOI: 10.1039/c4cp03161j] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The adsorption of poly(N-isopropyl acrylamide) (PNIPAM) onto talc from aqueous solutions has been studied using the in situ methodology of particle film attenuated total reflection (ATR) Fourier transform infrared (FTIR) spectroscopy. PNIPAM was observed to adsorb significantly onto the talc particle film at a temperature below its lower critical solution temperature (LCST). Peak shifts were seen in the adsorbed layer FTIR spectrum that match those observed when PNIPAM solution is heated above its LCST. This observation indicates that adsorption causes a conformational re-arrangement similar to that seen when PNIPAM undergoes a coil-to-globule transition, in this case presumably induced by hydrophobic interactions between PNIPAM and the talc basal plane surface. The kinetics of adsorption are seen to be complex, with potential influences of conformational rearrangement and differential adsorption kinetics for the two dominant surface regions of talc particles. The adsorbed PNIPAM was seen to be exceptionally resistant to removal, with no desorption occurring when a background electrolyte solution was flowed over the adsorbed layer. Spectra acquired of the adsorbed polymer layer heated above the LCST reveal that a further conformational rearrangement takes place for the adsorbed layer, finalizing the transition from coil-to-globule that was initiated by the interaction with the mineral surface.
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Affiliation(s)
- David A Beattie
- Ian Wark Research Institute, University of South Australia, Mawson Lakes SA 5095, Australia.
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32
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Pippa N, Meristoudi A, Pispas S, Demetzos C. Temperature-dependent drug release from DPPC:C12H25-PNIPAM-COOH liposomes: control of the drug loading/release by modulation of the nanocarriers' components. Int J Pharm 2015; 485:374-82. [PMID: 25776453 DOI: 10.1016/j.ijpharm.2015.03.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 03/05/2015] [Accepted: 03/09/2015] [Indexed: 01/20/2023]
Abstract
Novel polymer-modified thermosensitive liposomes were developed for the delivery of indomethacin in order to control its release profile. When attached to 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) liposomes, the end functionalized C12H25-poly(N-isopropylacrylamide)-COOH (C12H25-PNIPAM-COOH) polymer was membrane-disruptive in a temperature-dependent manner. The interest for this polymer is driven by its famous lower critical solution temperature (LCST) behavior, where heating an aqueous solution of PNIPAM above 32°C induces nanophase separation and polymer chain aggregation. The physicochemical/structural behavior of these polymer-modified thermosensitive liposomes was found to depend on the PNIPAM:lipid molar ratio and the composition of the polymeric guest. The incorporation of PNIPAM has caused alterations in the thermotropic behavior of DPPC liposomes, as the differential scanning calorimetry (DSC) experiments revealed. The drug loading and the release were found to be strongly dependent on the thermotropic characteristics of the PNIPAM grafted DPPC liposomes. Namely, the in vitro release is immediate at 37°C (>LCST) ("burst" effect), while the prepared mixed nanocarriers did not release the encapsulated bioactive substance at <32°C (<LCST). Thus, the thermosensitivity and the drug loading/release properties of the prepared formulations can be modulated by varying the ratio of DPPC/PNIPAM components, as well as the molecular characteristics of the polymeric guest.
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Affiliation(s)
- Natassa Pippa
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou 15771, Athens, Greece; Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Anastasia Meristoudi
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Stergios Pispas
- Theoretical and Physical Chemistry Institute, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, Athens 11635, Greece
| | - Costas Demetzos
- Department of Pharmaceutical Technology, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimioupolis Zografou 15771, Athens, Greece.
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33
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Yang HW, Lee AW, Huang CH, Chen JK. Characterization of poly(N-isopropylacrylamide)-nucleobase supramolecular complexes featuring bio-multiple hydrogen bonds. SOFT MATTER 2014; 10:8330-8340. [PMID: 25196131 DOI: 10.1039/c4sm01496k] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this study we employed poly(N-isopropylacrylamide) (PNIPAAm) as a matrix that we hybridized with five different nucleobase units (adenine, thymine, uracil, guanine, cytosine) to generate PNIPAAm-nucleobase supramolecular complexes (PNSCs) stabilized through bio-multiple hydrogen bonds (BMHBs). These nucleobase units interacted with PNIPAAm through BMHBs of various strengths, leading to competition between the BMHBs and the intramolecular hydrogen bonds (HBs) of PNIPAAm. The changes in morphology, crystalline structure, and thermoresponsive behavior of PNIPAAm were related to the strength of its BMHBs with the nucleobases. The strengths of the BMHBs followed the order guanine > adenine > thymine > cytosine > uracil, as verified through analyses of Fourier transform infrared spectra, lower critical solution temperatures, and inter-association equilibrium constants. The PNSCs also exhibited remarkable improvements in conductivity upon the formation of BMHBs, which facilitated proton transport. The neat PNIPAAm film was an insulator, but it transformed into a semiconductor after hybridizing with the nucleobases. In particular, the resistivity of the PNIPAAm-guanine supramolecular complex decreased to 1.35 × 10(5) ohm cm. The resistivity of the PNIPAAm-cytosine supramolecular complex increased significantly from 5.83 × 10(6) to 3 × 10(8) ohm cm upon increasing the temperature from 40 to 50 °C, suggesting that this material might have applicability in thermo-sensing. The ability to significantly improve the conductivity of hydrogels through such a simple approach involving BMHBs might facilitate their use as novel materials in bioelectronics.
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Affiliation(s)
- Hsiu-Wen Yang
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec 4, Keelung Rd, Taipei, 106, Taiwan, Republic of China.
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Franks GV, O'Shea JP, Forbes E. Controlling thickener underflow rheology using a temperature responsive flocculant. AIChE J 2014. [DOI: 10.1002/aic.14469] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- George V. Franks
- Dept. of Chemical and Biomolecular Engineering; Australian Mineral Science Research Institute, University of Melbourne; Parkville Victoria 3010 Australia
| | - John-Paul O'Shea
- Dept. of Chemical and Biomolecular Engineering; Australian Mineral Science Research Institute, University of Melbourne; Parkville Victoria 3010 Australia
| | - Elizaveta Forbes
- Dept. of Chemical and Biomolecular Engineering; Australian Mineral Science Research Institute, University of Melbourne; Parkville Victoria 3010 Australia
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Wang Y, Kotsuchibashi Y, Liu Y, Narain R. Temperature-responsive hyperbranched amine-based polymers for solid-liquid separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2360-2368. [PMID: 24533692 DOI: 10.1021/la5003012] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Temperature-responsive hyperbranched polymers containing primary amines as pendent groups have been synthesized for solid-liquid separation of kaolinite clay suspension. The effects of temperature, polymer charge density, and polymer architecture on particle flocculation have been investigated. Suspensions treated with the temperature-responsive amine-based hyperbranched polymers showed remarkable separation of the fine particles at a low polymer dosage of 10 ppm and at testing temperatures of 40 °C. In comparison to other polymers studied (linear and hyperbranched homopolymers and copolymers), the temperature-responsive amine-based hyperbranched copolymers showed better particle flocculation at 40 °C, as evidenced by the formation of a thinner sediment bed without compromising the amount of clay particles being flocculated. This superior solid-liquid separation performance can be explained by the hydrophobic interaction of PNIPAM segments on particle surfaces or the capture of additional free particles or small floc due to the exposure of buried positive charges (because of the phase separation of the hydrophilic amines and hydrophobic PNIPAM part) at temperatures above the lower critical solution temperature (LCST).
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Affiliation(s)
- Yinan Wang
- Department of Chemical and Materials Engineering, University of Alberta , 116 Street and 85 Avenue, Edmonton, AB T6G 2G6, Canada
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Combination of Natural and Thermosensitive Polymers in Flocculation of Fine Silica Dispersions. ACTA ACUST UNITED AC 2013. [DOI: 10.1155/2013/242684] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
A novel strategy for faster and better flocculation in solid-liquid separation processes is reported: the use of the natural polyelectrolyte chitosan (CH2500) in combination with the biocompatible thermosensitive polymer poly(N-vinylcaprolactam) (PNVCL). Silica dispersions (Aerosil OX50) were used as model and evaluated by means of analytical centrifuge, laser diffraction, and turbidimetry studies. Results show that the sedimentation velocity is doubled by addition of PNVCL and that at 45°C the density of the sediment is 33% higher, as compared to the use of CH2500 only. This results from the temperature sensitive behavior of PNVCL that phase-separate expelling water at temperatures higher than its LCST (32–34°C) leading to compaction of the flocs. By using this strategy the sediment is more compact, contains less water, and contains a very small amount of biodegradable CH2500 and biocompatible PNVCL.
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Bunk J, Drechsler A, Rauch S, Uhlmann P, Stamm M, Rennekamp R. The distribution of hydrophobized inorganic nanoparticles in thermoresponsive polymer nanocomposite films investigated by Scanning Probe and Electron Microscopy. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2013.03.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Sakohara S, Kawachi T, Gotoh T, Iizawa T. Consolidation of suspended particles by using dual ionic thermosensitive polymers with incorporated a hydrophobic component. Sep Purif Technol 2013. [DOI: 10.1016/j.seppur.2012.12.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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39
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Mori T, Tsubaki J, O'Shea JP, Franks GV. Hydrostatic pressure measurement for evaluation of particle dispersion and flocculation in slurries containing temperature responsive polymers. Chem Eng Sci 2013. [DOI: 10.1016/j.ces.2012.02.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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40
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Temperature and pH dual-responsive coatings of oligoperoxide-graft-poly(N-isopropylacrylamide): Wettability, morphology, and protein adsorption. J Colloid Interface Sci 2012; 387:95-105. [DOI: 10.1016/j.jcis.2012.08.007] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 08/01/2012] [Accepted: 08/02/2012] [Indexed: 11/18/2022]
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Bodvik R, Macakova L, Karlson L, Thormann E, Claesson P. Temperature-dependent competition between adsorption and aggregation of a cellulose ether--simultaneous use of optical and acoustical techniques for investigating surface properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:9515-9525. [PMID: 22621259 DOI: 10.1021/la301114f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Adsorption of the temperature-responsive polymer hydroxypropylmethylcellulose (HPMC) from an aqueous solution onto hydrophobized silica was followed well above the bulk instability temperature (T(2)) in temperature cycle experiments. Two complementary techniques, QCM-D and ellipsometry, were utilized simultaneously to probe the same substrate immersed in polymer solution. The interfacial processes were correlated with changes in polymer aggregation and viscosity of polymer solutions, as monitored by light scattering and rheological measurements. The simultaneous use of ellipsometry and QCM-D, and the possibility to follow layer properties up to 80 °C, well above the T(2) temperature, are both novel developments. A moderate increase in adsorbed amount with temperature was found below T(2), whereas a significant increase in the adsorbed mass and changes in layer properties were observed around the T(2) temperature where the bulk viscosity increases significantly. Thus, there is a clear correlation between transition temperatures in the adsorbed layer and in bulk solution, and we discuss this in relation to a newly proposed model that considers competition between aggregation and adsorption/deposition. A much larger temperature response above the T(2) temperature was found for adsorbed layers of HPMC than for layers of methyl cellulose. Possible reasons for this are discussed.
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Affiliation(s)
- Rasmus Bodvik
- Department of Chemistry, Surface and Corrosion Science, Royal Institute of Technology, Drottning Kristinas väg 51, SE-100 44 Stockholm, Sweden
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Husin H, Leong YK, Liu J. Conformational molecular structure–surface force correlation of ethylenediaminetetracetic, nitrilotriacetic and (S,S)-ethylenediamine-N,N′-disuccinic acids in α-Al2O3 dispersions. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.12.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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O'Shea JP, Qiao GG, Franks GV. Temperature-responsive solid-liquid separations with charged block-copolymers of poly(N-isopropyl acryamide). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:905-913. [PMID: 22070408 DOI: 10.1021/la2038872] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Temperature responsive charged block-copolymers of poly(N-isopropylacrylamide) (PNIPAM) have been used in the solid-liquid separation of alumina mineral particles from aqueous solution. The effects of temperature, polymer charge-sign and fraction of charged segment have been investigated. Batch settling and adsorption studies showed that rapid sedimentation results for suspensions with polymers of opposite charge-sign to the particle surface-charge (counterionic) at 50 °C. Cooling the suspensions after flocculation at 50 °C was found to increase the final solids volume fraction of the sediment beds formed through a mechanism related to partial desorption of polymer and the reduction of the hydrophobic attraction. Suspension stability results after dosing with polymers of similar charge-sign to the particle surface-charge (co-ionic) at both 25 and 50 °C. Increasing the amount of polymer charge increased the influence of polymer charge-sign on the adsorption and solid-liquid separation behavior. The performance of the charged block copolymers are compared to that of the random charged copolymer and neutral homopolymer PNIPAM structures.
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Affiliation(s)
- John-Paul O'Shea
- Department of Chemical and Biomolecular Engineering, Australian Mineral Science Research Institute, The University of Melbourne, Victoria, 3010 Australia
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Gong ZL, Tang DY, Guo YD. The fabrication and self-flocculation effect of hybrid TiO2 nanoparticles grafted with poly(N-isopropylacrylamide) at ambient temperature via surface-initiated atom transfer radical polymerization. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm32168h] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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The effect of salt concentration and pH on the solid–liquid separation of silica suspensions with a temperature-responsive flocculant. Sep Purif Technol 2011. [DOI: 10.1016/j.seppur.2011.09.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Temperature responsive flocculation and solid–liquid separations with charged random copolymers of poly(N-isopropyl acrylamide). J Colloid Interface Sci 2011; 360:61-70. [DOI: 10.1016/j.jcis.2011.04.013] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2011] [Revised: 03/31/2011] [Accepted: 04/07/2011] [Indexed: 11/19/2022]
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47
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O'Shea JP, Tallon C. Yield stress behaviour of concentrated silica suspensions with temperature-responsive polymers. Colloids Surf A Physicochem Eng Asp 2011. [DOI: 10.1016/j.colsurfa.2011.05.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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48
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Forbes E. Shear, selective and temperature responsive flocculation: A comparison of fine particle flotation techniques. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.minpro.2011.02.001] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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50
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Burdukova E, Ishida N, Shaddick T, Franks GV. The size of particle aggregates produced by flocculation with PNIPAM, as a function of temperature. J Colloid Interface Sci 2011; 354:82-8. [DOI: 10.1016/j.jcis.2010.10.016] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 10/05/2010] [Accepted: 10/06/2010] [Indexed: 10/19/2022]
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