1
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Amgoth C, Patra S, Wasnik K, Maity P, Paik P. Controlled synthesis of thermosensitive tunable porous film of (
pNIPAM
)‐
b
‐(
PCL
) copolymer for sustain drug delivery. J Appl Polym Sci 2023. [DOI: 10.1002/app.53854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
Affiliation(s)
- Chander Amgoth
- School of Engineering Sciences and Technology University of Hyderabad Hyderabad Telangana India
| | - Sukanya Patra
- School of Biomedical Engineering Indian Institute of Technology (BHU) Varanasi Uttar Pradesh India
| | - Kirti Wasnik
- School of Biomedical Engineering Indian Institute of Technology (BHU) Varanasi Uttar Pradesh India
| | - Pradip Maity
- CSIR‐National Chemical Laboratory Pune Maharashtra India
| | - Pradip Paik
- School of Biomedical Engineering Indian Institute of Technology (BHU) Varanasi Uttar Pradesh India
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2
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Amer Cid Í, Van Daele L, Dubruel P, Neyts K, Strubbe F. Single-particle electrophoresis for studying the adsorption of cationic polymers onto anionic particles. Electrophoresis 2023; 44:417-430. [PMID: 36412554 DOI: 10.1002/elps.202200209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 11/02/2022] [Accepted: 12/06/2022] [Indexed: 11/23/2022]
Abstract
Understanding the adsorption of polymers onto particles is crucial for many technological and biomedical applications. Even though polymer adsorption on particles is a dynamic process, most experimental techniques can only study the adsorption indirectly, in equilibrium and on the ensemble level. New analysis methods are required to overcome these limitations. We investigated the use of single-particle electrophoresis to study the adsorption kinetics of cationic polymers onto anionic particles and compared the resulting data to a theoretical model. In this approach, the electrophoretic mobility of single polystyrene (PS) particles, exposed to different concentrations of poly(2-guanidinoethyl methacrylate), was measured as a function of time. The polymer adsorption leads to an electrophoretic mobility change of the PS particle over time, from the initial negative value to a positive value at equilibrium. By fitting the kinetics data to the Langmuir model, the adsorption rate, desorption rate and equilibrium constant were determined. Finally, the adsorption kinetics of several other polymers was investigated. This showed that the presented technique enables direct analysis and comparison of the kinetics of polymer adsorption on the single-particle level.
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Affiliation(s)
- Íngrid Amer Cid
- Department of Electronics and Information Systems, Ghent University, Ghent, Belgium
| | - Lenny Van Daele
- Polymer Chemistry and Biomaterials (PBM) research group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Peter Dubruel
- Polymer Chemistry and Biomaterials (PBM) research group, Centre of Macromolecular Chemistry (CMaC), Department of Organic and Macromolecular Chemistry, Faculty of Sciences, Ghent University, Ghent, Belgium
| | - Kristiaan Neyts
- Department of Electronics and Information Systems, Ghent University, Ghent, Belgium
| | - Filip Strubbe
- Department of Electronics and Information Systems, Ghent University, Ghent, Belgium
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3
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Dai M, Zhao J, Zhang Y, Li H, Zhang L, Liu Y, Ye Z, Zhu S. Dual-Responsive Hydrogels with Three-Stage Optical Modulation for Smart Windows. ACS APPLIED MATERIALS & INTERFACES 2022; 14:53314-53322. [PMID: 36382563 DOI: 10.1021/acsami.2c16319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Since room temperature management consumes a large amount of building energy, thermochromic smart windows have been extensively used for temperature regulation and energy management. However, the development of the smart window is still limited by its simple thermochromic performance, unreasonable thermochromic temperature, and the lack of additional stimulation conditions. In this work, a dual-responsive hydrogel was developed by introducing sodium dodecyl sulfate (SDS) and sodium chloride into the cross-linking network of poly(N-isopropylacrylamide) (PNIPAM) and polyacrylamide (PAM) for energy-saving and privacy protection. By controlling the temperature from low (<15 °C) to medium (15-28 °C) to high (>28 °C), the dual-responsive hydrogel achieved a reversible three-stage transition of opaque-transparent-translucent. The hydrogel exhibited a satisfactory solar modulation ability (Tlum = 80.3%, ΔTsol,15-18°C = 72.9%, ΔTsol,18-35°C = 42.7%) and effective IR and UV shielding at high (or low) temperatures. Moreover, compared with traditional windows, smart windows made of dual-responsive hydrogels could offer better thermal insulation and heat preservation. The electrochromic properties of the dual-responsive hydrogel presented a facile strategy to meet the needs of different situations. The dual-responsive hydrogel features energy-saving, privacy protection, three-stage optical modulation, and multistimulus responsiveness, making it an ideal smart window candidate.
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Affiliation(s)
- Mingyun Dai
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
| | - Jian Zhao
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
| | - Yadong Zhang
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
| | - Haijun Li
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
| | - Leping Zhang
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
| | - Ying Liu
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
- Key Laboratory of Environment Controlled Aquaculture, Ministry of Education, Dalian116023, China
| | - Zhangying Ye
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
| | - Songming Zhu
- College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou310058, China
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4
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Zhu L, Song Q, Ma H. Synthesis of hyperbranched polysiloxane/poly(N-isopropylacrylamide) microgel, its stimulus responsive behavior and study for drug release. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2022. [DOI: 10.1080/10601325.2022.2149341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Lin Zhu
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, China
| | - Qiusheng Song
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, China
| | - Haihong Ma
- School of Chemistry and Chemical Engineering, Hefei University of Technology, Hefei, China
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5
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Precise Synthesis and Thermoresponsive Property of Poly(ethyl glycidyl ether) and Its Block and Statistic Copolymers with Poly(glycidol). Polymers (Basel) 2021; 13:polym13223873. [PMID: 34833172 PMCID: PMC8623496 DOI: 10.3390/polym13223873] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2021] [Revised: 11/01/2021] [Accepted: 11/03/2021] [Indexed: 11/16/2022] Open
Abstract
In this paper, we describe a comprehensive study of the thermoresponsive properties of statistic copolymers and multiblock copolymers synthesized by poly(glycidol)s (PG) and poly(ethyl glycidyl ether) (PEGE) with different copolymerization methods. These copolymers were first synthesized by ring-opening polymerization (ROP), which was initiated by tert-butylbenzyl alcohol (tBBA) and 1-tert-butyl-4,4,4-tris(dimethylamino)-2,2-bis[tris(dimethylamino)phosphoranylidenamino]-2Λ5,4Λ5-catenadi(phosphazene) (t-Bu-P4) as the catalyst, and then the inherent protective groups were removed to obtain the copolymers without any specific chain end groups. The thermoresponsive property of the statistic copolymer PGx-stat-PEGEy was compared with the diblock copolymer PGx-b-PEGEy, and the triblock copolymers were compared with the pentablock copolymers. Among them, PG-stat-PEGE, PG-b-PEGE-b-PG-b-PEGE-b-PG, and PEGE-b-PG-b-PEGE-b-PG-b-PEGE, and even the specific ratio of PEGE-b-PG-b-PEGE, exhibited LCST-type phase transitions in water, which were characterized by cloud point (Tcp). Although the ratio of x to y affected the value of the Tcp of PGx-stat-PEGEy, we found that the disorder of the copolymer has a decisive effect on the phase-transition behavior. The phase-transition behaviors of PG-b-PEGE, part of PEGE-b-PG-b-PEGE, and PG-b-PEGE-b-PG copolymers in water present a two-stage phase transition, that is, firstly LCST-type and then the upper critical solution temperature (UCST)-like phase transition. In addition, we have extended the research on the thermoresponsive properties of EGE homopolymers without specific α-chain ends.
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6
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Khalil M, Fahmi A, Nizardo NM, Amir Z, Mohamed Jan B. Thermosensitive Core-Shell Fe 3O 4@poly( N-isopropylacrylamide) Nanogels for Enhanced Oil Recovery. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:8855-8865. [PMID: 34242029 DOI: 10.1021/acs.langmuir.1c01271] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
An investigation on the application of thermosensitive core-shell Fe3O4@PNIPAM nanogels in enhanced oil recovery was successfully performed. Here, the unique core-shell architecture was fabricated by conducting the polymerization at the surface of 3-butenoic acid-functionalized Fe3O4 nanoparticles and characterized using X-ray diffraction (XRD), 1H NMR, vibration sample magnetometer (VSM), and high-resolution transmission electron microscopy (HR-TEM). According to the results, this core-shell structure was beneficial for achieving the desired high viscosity and low nanofluid mobility ratio at high temperatures, which is essential for enhanced oil recovery (EOR) application. The results demonstrated that the nanogels exhibited a unique temperature-dependent flow behavior due to the PNIPAM shell's ability to transform from a hydrated to a dehydrated state above its low critical solution temperature (LCST). At such conditions, the nanogels exhibited a significantly low mobility ratio (M = 0.86), resulting in an even displacement front during EOR and leads to higher oil production. Based on the result obtained from sand pack flooding, about 25.75% of an additional secondary oil recovery could be produced when the nanofluid was injected at a temperature of 45 °C. However, a further increase in the flooding temperature could result in a slight reduction in oil recovery due to the precipitation of some of the severely aggregated nanogels at high temperatures.
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Affiliation(s)
- Munawar Khalil
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, 16424 Depok, West Java, Indonesia
| | - Alwy Fahmi
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, 16424 Depok, West Java, Indonesia
| | - Noverra Mardhatillah Nizardo
- Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, 16424 Depok, West Java, Indonesia
| | - Zulhelmi Amir
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
| | - Badrul Mohamed Jan
- Department of Chemical Engineering, Faculty of Engineering, University of Malaya, 50603 Kuala Lumpur, Malaysia
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7
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Shetty S, Mahendran A, Anandhan S. Development of a new flexible nanogenerator from electrospun nanofabric based on PVDF/talc nanosheet composites. SOFT MATTER 2020; 16:5679-5688. [PMID: 32519712 DOI: 10.1039/d0sm00341g] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Herein, a flexible piezoelectric nanogenerator composed of electrospun talc/PVDF [poly(vinylidene fluoride)] nanocomposite fabrics has been developed. These nanocomposite fabrics demonstrated enhanced mechanical and piezoelectric properties compared with pristine PVDF nanofabrics. In particular, nanocomposite fabrics with 0.50 wt% talc yielded 89.6% of polar β-phase in the PVDF matrix, thereby augmenting its piezoelectric response. X-ray diffraction, Fourier transform infrared spectroscopy, and differential scanning calorimetry conclusively affirmed the promotion of polar β-phase in the talc/PVDF nanocomposite fabrics. The 0.50 wt% talc/PVDF nanocomposite fabric based nanogenerator produced an open-circuit voltage and power density of 9.1 V and 1.12 μW cm-2, respectively, under repetitive finger tapping mode (under a load of 3.8 N). Furthermore, the nanogenerator was also subjected to frequency modulated-shaker mode, wherein an output voltage of 8.9 V was produced. Improved flexibility, mechanical robustness, and enhanced piezoelectric responsiveness of this nanogenerator could possibly pave the way for its use in portable self-powered devices.
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Affiliation(s)
- Sawan Shetty
- Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Srinivas Nagar, Mangaluru-575025, India.
| | - Arunjunairaj Mahendran
- Kompetenzzentrum Holz GmbH, W3C, A-9300 St. Veit/Glan, Klagenfurter Strasse 87-89, Linz, Austria
| | - S Anandhan
- Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Srinivas Nagar, Mangaluru-575025, India.
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8
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Fan Y, Bose RK, Picchioni F. Highly Branched Waxy Potato Starch-Based Polyelectrolyte: Controlled Synthesis and the Influence of Chain Composition on Solution Rheology. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b06893] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yifei Fan
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Ranjita K. Bose
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
| | - Francesco Picchioni
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands
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9
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Radu IC, Biru IE, Damian CM, Ion AC, Iovu H, Tanasa E, Zaharia C, Galateanu B. Grafting versus Crosslinking of Silk Fibroin-g-PNIPAM via Tyrosine-NIPAM Bridges. Molecules 2019; 24:molecules24224096. [PMID: 31766195 PMCID: PMC6891396 DOI: 10.3390/molecules24224096] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 11/04/2019] [Accepted: 11/08/2019] [Indexed: 11/20/2022] Open
Abstract
This paper reports the synthesis and complex characterization of novel polymeric networks based on the crosslinking of Bombyx mori silk fibroin via poly(N-isopropylacrylamide) bridges generated by an ammonium cerium nitrate redox system. The research study gives an understanding of the polymerization mechanism in terms of the generation of radical sites, radical growth and termination reaction, as well as the involvement of modifications on silk fibroin structure and properties. The physico-chemical characterization was carried out by FTIR-ATR, X-ray photoelectron spectroscopy and RAMAN spectroscopy with unravelling the chemical modification. The structural characterization and spatial arrangement by secondary structure were carried out by X-ray diffraction and circular dichroism. The thermal behavior and thermal stability were evaluated by differential scanning calorimetry and thermogravimetric analysis. The novel complex polymer network is intended to be used in the field of smart drug delivery systems.
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Affiliation(s)
- Ionut-Cristian Radu
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Iuliana-Elena Biru
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Celina-Maria Damian
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Andreea-Cristina Ion
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Horia Iovu
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
| | - Eugenia Tanasa
- Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 011061 Bucharest, Romania;
| | - Catalin Zaharia
- Advanced Polymer Materials Group, Department of Bioresources and Polymer Science, Politehnica University of Bucharest, 011061 Bucharest, Romania; (I.-C.R.); (C.-M.D.); (A.-C.I.); (H.I.)
- Correspondence: ; Tel.: +40-727-694-492
| | - Bianca Galateanu
- Department of Biochemistry and Molecular Biology, Faculty of Biology, University of Bucharest, 050095 Bucharest, Romania;
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10
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Adsorption mechanism of alkyl hydroxamic acid onto bastnäsite: Fundamental steps toward rational collector design for rare earth elements. J Colloid Interface Sci 2019; 553:210-219. [DOI: 10.1016/j.jcis.2019.06.025] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Revised: 05/31/2019] [Accepted: 06/08/2019] [Indexed: 11/21/2022]
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11
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Thermoresponsive polymer brushes on magnetic chitosan microspheres: Synthesis, characterization and application in oily water of high salinity. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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12
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Temperature-sensitive semi-IPN composite hydrogels for antibacterial applications. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.04.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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13
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Synthesis of silver nanoparticles using aqueous extracts of Pterodon emarginatus leaves collected in the summer and winter seasons. INTERNATIONAL NANO LETTERS 2019. [DOI: 10.1007/s40089-019-0265-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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14
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Joyce P, Dening TJ, Meola TR, Schultz HB, Holm R, Thomas N, Prestidge CA. Solidification to improve the biopharmaceutical performance of SEDDS: Opportunities and challenges. Adv Drug Deliv Rev 2019; 142:102-117. [PMID: 30529138 DOI: 10.1016/j.addr.2018.11.006] [Citation(s) in RCA: 62] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 11/21/2018] [Accepted: 11/27/2018] [Indexed: 01/28/2023]
Abstract
Self-emulsifying drug delivery systems (SEDDS) offer potential for overcoming the inherent slow dissolution and poor oral absorption of hydrophobic drugs by retaining them in a solubilised state during gastrointestinal transit. However, the promising biopharmaceutical benefits of liquid lipid formulations has not translated into widespread commercial success, due to their susceptibility to long term storage and in vivo precipitation issues. One strategy that has emerged to overcome such limitations, is to combine the solubilisation and dissolution enhancing properties of lipids with the stabilising effects of solid carrier materials. The development of intelligent hybrid drug formulations has presented new opportunities to harness the potential of emulsified lipids in optimising oral bioavailability for lipophilic therapeutics. Specific emphasis of this review is placed on the impact of solidification approaches and excipients on the biopharmaceutical performance of self-emulsifying lipids, with findings highlighting the key design considerations that should be implemented when developing hybrid lipid-based formulations.
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Chen Y, Tong J, Dong J, Luo J, Liu X. A Temperature-Responsive Boronate Core Cross-Linked Star (CCS) Polymer for Fast and Highly Efficient Enrichment of Glycoproteins. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1900099. [PMID: 30811830 DOI: 10.1002/smll.201900099] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 01/31/2019] [Indexed: 06/09/2023]
Abstract
Fast and highly efficient enrichment and separation of glycoproteins is essential in many biological applications, but the lack of materials with high capture capacity, fast, and efficient enrichment/separation makes it a challenge. Here, a temperature-responsive core cross-linked star (CCS) polymer with boronate affinity is reported for fast and efficient enriching and separating of glycoproteins from biological samples. The temperature-responsive CCS polymers containing boronic acid in its polymeric arms and poly(N-isopropyl acrylamide) in its cross-linked core are prepared using reversible addition-fragmentation chain transfer polymerization via an "arm-first" methodology. The soluble boronate polymeric arms of the CCS polymers provide a homogeneous reaction system and facilitate interactions between boronic acid and glycoproteins, which leads to a fast binding/desorption speed and high capture capacity. Maximum binding capacity of the prepared CCS polymer for horseradish peroxidase is determined to be 210 mg g-1 , which can be achieved within 20 min. More interestingly, the temperature-responsive CCS polymers exhibit rapid reversible thermal-induced volume phase transition by increasing the temperature from 15 to 30 °C, resulting in a facile and convenient sample collection and recovery for the target glycoproteins. Finally, the temperature-responsive CCS polymer is successfully applied to enrichment of low abundant glycoproteins.
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Affiliation(s)
- Yaxin Chen
- Key laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Lihu Street 1800, Wuxi, 214122, China
| | - Jiexiang Tong
- Key laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Lihu Street 1800, Wuxi, 214122, China
| | - Jiahao Dong
- Key laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Lihu Street 1800, Wuxi, 214122, China
| | - Jing Luo
- Key laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Lihu Street 1800, Wuxi, 214122, China
| | - Xiaoya Liu
- Key laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Lihu Street 1800, Wuxi, 214122, China
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Su Y, Ojo OF, Tsengam IKM, He J, McPherson GL, John VT, Valla JA. Thermoresponsive Coatings on Hollow Particles with Mesoporous Shells Serve as Stimuli-Responsive Gates to Species Encapsulation and Release. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:14608-14616. [PMID: 30428674 DOI: 10.1021/acs.langmuir.8b02714] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Nanoscale capsule-type particles with stimuli-respondent transport of chemical species into and out of the capsule are of significant technological interest. We describe the facile synthesis, properties, and applications of a temperature-responsive silica-poly( N-isopropylacrylamide) (PNIPAM) composite consisting of hollow silica particles with ordered mesoporous shells and a complete PNIPAM coating layer. These composites start with highly monodisperse, hollow mesoporous silica particles fabricated with precision using a template-driven approach. The particles possess a high specific surface area (1771 m2/g) and large interior voids that are accessible to the exterior environment through pore channels of the silica shell. An exterior PNIPAM coating provides thermoresponsiveness to the composite, acting as a gate to regulate the uptake and release of functional molecules. Uptake and release of a model compound (rhodamine B) occurs at temperatures below the lower critical solution temperature (LCST) of 32 °C, while the dehydrated hydrophobic polymer layer collapses over the particle at temperatures above the LCST, leading to a shutoff of uptake and release. These transitions are also manifest at an oil-water interface, where the polymer-coated hollow particles stabilize oil-in-water emulsions at temperatures below the LCST and destabilize the emulsions at temperatures above the LCST. Cryogenic scanning electron microscopy indicates patchlike particle structures at the oil-water interface of the stabilized emulsions. The silica-PNIPAM composite therefore couples advantages from both the hollow mesoporous silica structure and the thermoresponsive polymer.
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Affiliation(s)
| | | | | | | | | | | | - Julia A Valla
- Department of Chemical and Biomolecular Engineering , University of Connecticut , Storrs , Connecticut 06269 , United States
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18
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Tan M, Horvàth L, Brunetto PS, Fromm KM. Trithiocarbonate-Functionalized PNiPAAm-Based Nanocomposites for Antimicrobial Properties. Polymers (Basel) 2018; 10:E665. [PMID: 30966699 PMCID: PMC6404129 DOI: 10.3390/polym10060665] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 06/08/2018] [Accepted: 06/12/2018] [Indexed: 12/22/2022] Open
Abstract
In this study, four trithiocarbonate-functionalized PNiPAAms with different molecular weights were synthesized and used as a matrix to form composites with silver nanoparticles. Nanocomposites with several polymer-to-silver ratios P:Ag⁺ were prepared in order to evaluate the influence of silver loading. UV studies showed a thermoresponsive behavior of the nanocomposites with a thermo-reversibility according to cooling-heating cycles. Release kinetics demonstrated that the release of silver ions is mainly influenced by the size of the silver nanoparticles (AgNPs), which themselves depend on the polymer length. Antimicrobial tests against E. coli and S. aureus showed that some of the nanocomposites are antimicrobial and even full killing could be induced.
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Affiliation(s)
- Milène Tan
- Department of Chemistry, University of Fribourg, Chemin du Musée, 9, 1700 Fribourg, Switzerland.
| | - Lenke Horvàth
- Department of Chemistry, University of Fribourg, Chemin du Musée, 9, 1700 Fribourg, Switzerland.
| | - Priscilla S Brunetto
- Department of Chemistry, University of Fribourg, Chemin du Musée, 9, 1700 Fribourg, Switzerland.
| | - Katharina M Fromm
- Department of Chemistry, University of Fribourg, Chemin du Musée, 9, 1700 Fribourg, Switzerland.
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Allen ACB, Barone E, Crosby COK, Suggs LJ, Zoldan J. Electrospun poly(N-isopropyl acrylamide)/poly(caprolactone) fibers for the generation of anisotropic cell sheets. Biomater Sci 2018; 5:1661-1669. [PMID: 28675203 DOI: 10.1039/c7bm00324b] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Cell alignment in muscle, nervous tissue, and cartilage is requisite for proper tissue function; however, cell sheeting techniques using the thermosensitive polymer poly(N-isopropyl acrylamide) (PNIPAAm) can only produce anisotropic cell sheets with delicate and resource-intensive modifications. We hypothesized that electrospinning, a relatively simple and inexpensive technique to generate aligned polymer fibers, could be used to fabricate anisotropic PNIPAAm and poly(caprolactone) (PCL) blended surfaces that both support cell viability and permit cell sheet detachment via PNIPAAm dissolution. Aligned electrospun PNIPAAm/PCL fibers (0%, 25%, 50%, 75%, 90%, and 100% PNIPAAm) were electrospun and characterized. Fibers ranged in diameter from 1-3 μm, and all fibers had an orientation index greater than 0.65. Fourier transform infrared spectroscopy was used to confirm the relative content of PNIPAAm and PCL. For advancing water contact angle and mass loss studies, only high PNIPAAm-content fibers (75% and greater) exhibited, temperature-dependent properties like 100% PNIPAAm fibers, whereas 25% and 50% PNIPAAm fibers behaved similarly to PCL-only fibers. 3T3 fibroblasts seeded on all PNIPAAm/PCL fibers had high cell viability and spreading except for the 100% PNIPAAm fibers. Cell sheet detachment by incubation with cold medium was successful only for 90% PNIPAAm fibers, which had a sufficient amount of PCL to allow cell attachment and spreading but not enough to prevent detachment upon PNIPAAm dissolution. This study demonstrates the feasibility of using anisotropic electrospun PNIPAAm/PCL fibers to generate aligned cell sheets that can potentially better recapitulate anisotropic architecture to achieve proper tissue function.
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Affiliation(s)
- Alicia C B Allen
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Elissa Barone
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Cody O Keefe Crosby
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Laura J Suggs
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
| | - Janet Zoldan
- Department of Biomedical Engineering, The University of Texas at Austin, Austin, TX 78712, USA.
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20
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Fan Y, Boulif N, Picchioni F. Thermo-Responsive Starch-g-(PAM-co-PNIPAM): Controlled Synthesis and Effect of Molecular Components on Solution Rheology. Polymers (Basel) 2018; 10:E92. [PMID: 30966130 PMCID: PMC6414930 DOI: 10.3390/polym10010092] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Revised: 01/12/2018] [Accepted: 01/16/2018] [Indexed: 11/23/2022] Open
Abstract
A series of highly branched random copolymers of acrylamide (AM) and N-isopropylacrylamide (NIPAM) have been prepared from a waxy potato starch-based macroinitiator by aqueous Cu⁰-mediated living radical polymerization (Cu⁰-mediated LRP). The NIPAM intake in the copolymer was varied between 0% and 50 mol % to evaluate the influence of chain composition on the aqueous rheological properties as well as their low critical solution temperature (LCST). The viscosity of the copolymer was found to increase with the NIPAM intake and an LCST can be observed when the NIPAM content is high enough (e.g., 50 mol %). In addition, thermo-thickening behavior was observed at a low shear rate (γ ≤ 10 s-1) and higher NIPAM content was found to shift the onset of thermo-thickening behavior to a lower temperature. However, the absolute increase in viscosity values is reduced with the NIPAM intake. Besides this, an interesting significant thermo-thickening behavior was also observed on highly branched starch-g-polyacrylamide at high temperatures (>80 °C), which has not been previously reported. Rheology tests also revealed a good salt-resistant property in copolymers with low NIPAM content (e.g., <25 mol %). Considering the viscosity profile in saline as compared to that in pure water, this NIPAM intake seems to represent an optimum balance of viscosity and salt-resistance performance.
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Affiliation(s)
- Yifei Fan
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.
| | - Nadia Boulif
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.
| | - Francesco Picchioni
- Engineering and Technology Institute Groningen, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.
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21
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Futscher MH, Philipp M, Müller-Buschbaum P, Schulte A. The Role of Backbone Hydration of Poly(N-isopropyl acrylamide) Across the Volume Phase Transition Compared to its Monomer. Sci Rep 2017; 7:17012. [PMID: 29208941 PMCID: PMC5717149 DOI: 10.1038/s41598-017-17272-7] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Accepted: 11/22/2017] [Indexed: 11/08/2022] Open
Abstract
Thermo-responsive polymers undergo a reversible coil-to-globule transition in water after which the chains collapse and aggregate into bigger globules when passing to above its lower critical solution temperature (LCST). The hydrogen bonding with the amide groups in the side chains has to be contrasted with the hydration interaction of the hydrophobic main-chain hydrocarbons. In the present investigation we study molecular changes in the polymer poly(N-isopropyl acrylamide) (PNIPAM) and in its monomer N-isopropyl acrylamide (NIPAM) in solution across the LCST transition. Employing Fourier-transform infrared spectroscopy we probe changes in conformation and hydrogen bonding. We observe a nearly discontinuous shift of the peak frequencies and areas of vibrational bands across the LCST transition for PNIPAM whereas NIPAM exhibits a continuous linear change with temperature. This supports the crucial role of the polymer backbone with respect to hydration changes in the amide group in combination with cooperative interactions of bound water along the backbone chain.
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Affiliation(s)
- Moritz H Futscher
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany
| | - Martine Philipp
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany
| | - Peter Müller-Buschbaum
- Technische Universität München, Physik-Department, Lehrstuhl für Funktionelle Materialien, James-Franck-Str. 1, 85748, Garching, Germany
| | - Alfons Schulte
- University of Central Florida, Department of Physics and College of Optics and Photonics, 4111 Libra Drive, Orlando, FL, 32817-2385, United States.
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22
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Thakur N, Sargur Ranganath A, Sopiha K, Baji A. Thermoresponsive Cellulose Acetate-Poly(N-isopropylacrylamide) Core-Shell Fibers for Controlled Capture and Release of Moisture. ACS APPLIED MATERIALS & INTERFACES 2017; 9:29224-29233. [PMID: 28795559 DOI: 10.1021/acsami.7b07559] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In this study, we used core-shell electrospinning to fabricate cellulose acetate-poly(N-isopropylacrylamide) (CA-PNIPAM) fibrous membranes and demonstrated the ability of these fibers to capture water from a high humid atmosphere and release it when thermally stimulated. The wettability of the fibers was controlled by using thermoresponsive PNIPAM as the shell layer. Scanning electron and fluorescence microscopes are used to investigate the microstructure of the fibers and confirm the presence of the core and shell phases within the fibers. The moisture capturing and releasing ability of these core-shell CA-PNIPAM fibers was compared with those of the neat CA and neat PNIPAM fibers at room temperature as well as at an elevated temperature. At room temperature, the CA-PNIPAM core-shell fibers are shown to have the maximum moisture uptake capacity among the three samples. The external temperature variations which trigger the moisture response behavior of these CA-PNIPAM fibers fall within the range of typical day and night cycles of deserts, demonstrating the potential use of these fibers for water harvesting applications.
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Affiliation(s)
- Neha Thakur
- Division of Engineering Product Development, Singapore University of Technology and Design (SUTD) , 8 Somapah Rd, 487372, Singapore
| | - Anupama Sargur Ranganath
- Division of Engineering Product Development, Singapore University of Technology and Design (SUTD) , 8 Somapah Rd, 487372, Singapore
| | - Kostiantyn Sopiha
- Division of Engineering Product Development, Singapore University of Technology and Design (SUTD) , 8 Somapah Rd, 487372, Singapore
| | - Avinash Baji
- Division of Engineering Product Development, Singapore University of Technology and Design (SUTD) , 8 Somapah Rd, 487372, Singapore
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23
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Kong WQ, Gao CD, Hu SF, Ren JL, Zhao LH, Sun RC. Xylan-Modified-Based Hydrogels with Temperature/pH Dual Sensitivity and Controllable Drug Delivery Behavior. MATERIALS (BASEL, SWITZERLAND) 2017; 10:E304. [PMID: 28772664 PMCID: PMC5503382 DOI: 10.3390/ma10030304] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 02/24/2017] [Accepted: 03/13/2017] [Indexed: 11/19/2022]
Abstract
Among the natural macromolecules potentially used as the scaffold material in hydrogels, xylan has aroused great interest in many fields because of its biocompatibility, low toxicity, and biodegradability. In this work, new pH and thermoresponsive hydrogels were prepared by the cross-linking polymerization of maleic anhydride-modified xylan (MAHX) with N-isopropylacrylamide (NIPAm) and acrylic acid (AA) under UV irradiation to form MAHX-g-P(NIPAm-co-AA) hydrogels. The pore volume, the mechanical properties, and the release rate for drugs of hydrogels could be controlled by the degree of substitution of MAHX. These hydrogels were characterized by swelling ability, lower critical solution temperature (LCST), Fourier-transform infrared (FTIR), and SEM. Furthermore, the cumulative release rate was investigated for acetylsalicylic acid and theophylline, as well as the cytocompatibility MAHX-based hydrogels. Results showed that MAHX-based hydrogels exhibited excellent swelling-deswelling properties, uniform porous structure, and the temperature/pH dual sensitivity. In vitro, the cumulative release rate of acetylsalicylic acid for MAHX-based hydrogels was higher than that for theophylline, and in the gastrointestinal sustained drug release study, the acetylsalicylic acid release rate was extremely slow during the initial 3 h in the gastric fluid (24.26%), and then the cumulative release rate reached to 90.5% after sustained release for 5 h in simulated intestinal fluid. The cytotoxicity experiment demonstrated that MAHX-based hydrogels could promote cell proliferation and had satisfactory biocompatibility with NIH3T3 cells. These results indicated that MAHX-based hydrogels, as new drug carriers, had favorable behavior for intestinal-targeted drug delivery.
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Affiliation(s)
- Wei-Qing Kong
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Cun-Dian Gao
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Shu-Feng Hu
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Jun-Li Ren
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Li-Hong Zhao
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
| | - Run-Cang Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.
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24
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Dzhoyashvili NA, Thompson K, Gorelov AV, Rochev YA. Film Thickness Determines Cell Growth and Cell Sheet Detachment from Spin-Coated Poly(N-Isopropylacrylamide) Substrates. ACS APPLIED MATERIALS & INTERFACES 2016; 8:27564-27572. [PMID: 27661256 DOI: 10.1021/acsami.6b09711] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Poly(N-isopropylacrylamide) (pNIPAm) is widely used to fabricate thermoresponsive surfaces for cell sheet detachment. Many complex and expensive techniques have been employed to produce pNIPAm substrates for cell culture. The spin-coating technique allows rapid fabrication of pNIPAm substrates with high reproducibility and uniformity. In this study, the dynamics of cell attachment, proliferation, and function on non-cross-linked spin-coated pNIPAm films of different thicknesses were investigated. The measurements of advancing contact angle revealed increasing contact angles with increasing film thickness. Results suggest that more hydrophilic 50 and 80 nm thin pNIPAm films are more preferable for cell sheet fabrication, whereas more hydrophobic 300 and 900 nm thick spin-coated pNIPAm films impede cell attachment. These changes in cell behavior were correlated with changes in thickness and hydration of pNIPAm films. The control of pNIPAm film thickness using the spin-coating technique offers an effective tool for cell sheet-based tissue engineering.
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Affiliation(s)
| | | | - Alexander V Gorelov
- School of Chemistry and Chemical Biology, University College Dublin , D04 R7R0, Belfield, Dublin 4, Ireland
- Institute of Theoretical and Experimental Biophysics, Russian Academy of Science , 142290 Pushchino, Moscow Region, Russia
| | - Yuri A Rochev
- Sechenov First Moscow State Medical University , Institute for Regenerative Medicine, 119991 Moscow, Russia
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25
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Synthesis and characterization of pH- and temperature-sensitive materials based on alginate and poly(N-isopropylacrylamide/acrylic acid) for drug delivery. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1550-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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26
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Wang Z, Voicu D, Tang L, Li W, Kumacheva E. Microfluidic studies of polymer adsorption in flow. LAB ON A CHIP 2015; 15:2110-2116. [PMID: 25828631 DOI: 10.1039/c5lc00241a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Adsorption of polymers from solutions moving past solid or liquid surfaces controls a broad range of phenomena in science, technology, and medicine. In the present work, a microfluidic methodology was developed to study polymer adsorption in flow under well-defined conditions by integrating an attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectrometer with a microfluidic device. Polymer adsorption in flow using exemplary polyelectrolytes such as polystyrene sulfonate and polyacrylic acid was studied under varying flow rates, polymer concentrations, pH values, and ionic strengths of the solution. Furthermore, the microfluidic platform was utilized to study layer-by-layer adsorption of alternating anionic and cationic polyelectrolytes such as polyacrylic acid and polyallylamine hydrochloride. The proposed methodology paves the way for studies of in-flow adsorption of biologically relevant molecules, which would mimic processes occurring in the cardiovascular microcirculation system.
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Affiliation(s)
- Zhaoyi Wang
- Department of Chemistry, University of Toronto, 80 Saint George street, Toronto, Ontario, Canada M5S 3H6.
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