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Jurku̅nas M, Talaikis M, Klimkevičius V, Pudžaitis V, Niaura G, Makuška R. Diblock Copolymers of Methacryloyloxyethyl Phosphorylcholine and Dopamine Methacrylamide: Synthesis and Real-Time Adsorption Dynamics by SEIRAS and RAIRS. Langmuir 2024; 40:5945-5958. [PMID: 38456424 PMCID: PMC10956495 DOI: 10.1021/acs.langmuir.3c03925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/18/2024] [Accepted: 02/23/2024] [Indexed: 03/09/2024]
Abstract
Amphiphilic diblock copolymers containing a block of 2-methacryloyloxyethyl phosphorylcholine (MPC) with unique properties to prevent nonspecific protein adsorption and enhance lubrication in aqueous media and a block of dopamine methacrylamide (DOPMA) distinguished by excellent adhesion performance were synthesized by reversible addition fragmentation chain transfer (RAFT) polymerization for the first time. The DOPMA monomer with an acetonide-protected catechol group (acetonide-protected dopamine methacrylamide (ADOPMA)) was used, allowing the prevention of undesirable side reactions during polymerization and oxidation during storage. The adsorption behavior of the diblock copolymers with protected and unprotected catechol groups on gold surfaces was probed using attenuated total reflection (ATR)-Fourier transform infrared (FTIR) spectroscopy, surface-enhanced infrared absorption spectroscopy (SEIRAS), and reflection-absorption infrared spectroscopy (RAIRS). The copolymers pMPC-b-pADOPMA demonstrated physisorption with rapid adsorption and ultrasound-assisted desorption, while the copolymers pMPC-b-DOPMA exhibited chemical adsorption with slower dynamics but a stronger interaction with the gold surface. SEIRAS and RAIRS allowed proving the reorientation of the diblock copolymers during adsorption, demonstrating the exposure of the pMPC block toward the aqueous phase.
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Affiliation(s)
- Marijus Jurku̅nas
- Institute
of Chemistry, Vilnius University, Naugarduko Str. 24, 03225 Vilnius, Lithuania
| | - Martynas Talaikis
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology (FTMC), Sauletekio Ave. 3, 10257 Vilnius, Lithuania
| | - Vaidas Klimkevičius
- Institute
of Chemistry, Vilnius University, Naugarduko Str. 24, 03225 Vilnius, Lithuania
| | - Vaidas Pudžaitis
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology (FTMC), Sauletekio Ave. 3, 10257 Vilnius, Lithuania
| | - Gediminas Niaura
- Department
of Organic Chemistry, Center for Physical
Sciences and Technology (FTMC), Sauletekio Ave. 3, 10257 Vilnius, Lithuania
| | - Ričardas Makuška
- Institute
of Chemistry, Vilnius University, Naugarduko Str. 24, 03225 Vilnius, Lithuania
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2
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Klimavicius V, Dagys L, Klimkevičius V, Lengvinaitė D, Aidas K, Balčiu Nas S, Banys J, Chizhik V, Balevicius V. Solid-State NMR and Impedance Spectroscopy Study of Spin Dynamics in Proton-Conducting Polymers: An Application of Anisotropic Relaxing Model. J Phys Chem B 2021; 125:12592-12602. [PMID: 34748346 PMCID: PMC8607415 DOI: 10.1021/acs.jpcb.1c06533] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
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The 1H–13C cross-polarization (CP)
kinetics in poly[2-(methacryloyloxy)ethyltrimethylammonium chloride]
(PMETAC) was studied under moderate (10 kHz) magic-angle spinning
(MAS). To elucidate the role of adsorbed water in spin diffusion and
proton conductivity, PMETAC was degassed under vacuum. The CP MAS
results were processed by applying the anisotropic Naito and McDowell
spin dynamics model, which includes the complete scheme of the rotating
frame spin–lattice relaxation pathways. Some earlier studied
proton-conducting and nonconducting polymers were added to the analysis
in order to prove the capability of the used approach and to get more
general conclusions. The spin-diffusion rate constant, which describes
the damping of the coherences, was found to be strongly depending
on the dipolar I–S coupling constant (DIS). The spin diffusion, associated with the incoherent thermal
equilibration with the bath, was found to be most probably independent
of DIS. It was deduced that the drying
scarcely influences the spin-diffusion rates; however, it significantly
(1 order of magnitude) reduces the rotating frame spin–lattice
relaxation times. The drying causes the polymer hardening that reflects
the changes of the local order parameters. The impedance spectroscopy
was applied to study proton conductivity. The activation energies
for dielectric relaxation and proton conductivity were determined,
and the vehicle-type conductivity mechanism was accepted. The spin-diffusion
processes occur on the microsecond scale and are one order faster
than the dielectric relaxation. The possibility to determine the proton
location in the H-bonded structures in powders using CP MAS technique
is discussed.
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Affiliation(s)
| | - Laurynas Dagys
- Department of Chemistry, University of Southampton, SO17 1BJ Southampton, U.K
| | | | - Dovilė Lengvinaitė
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania
| | - Kęstutis Aidas
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania
| | - Sergejus Balčiu Nas
- Institute of Applied Electrodynamics and Telecommunications, Vilnius University, LT-10257 Vilnius, Lithuania
| | - Juras Banys
- Institute of Applied Electrodynamics and Telecommunications, Vilnius University, LT-10257 Vilnius, Lithuania
| | - Vladimir Chizhik
- Faculty of Physics, St. Petersburg State University, 198504 St. Petersburg, Russia
| | - Vytautas Balevicius
- Institute of Chemical Physics, Vilnius University, LT-10257 Vilnius, Lithuania
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Dagys L, Klimkevičius V, Klimavicius V, Balčiūnas S, Banys J, Balevicius V. Cross‐polarization with magic‐angle spinning kinetics and impedance spectroscopy study of proton mobility, local disorder, and thermal equilibration in
hydrogen‐bonded
poly(methacrylic acid). Journal of Polymer Science 2020. [DOI: 10.1002/pol.20200592] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Laurynas Dagys
- Institute of Chemical Physics Vilnius University Vilnius Lithuania
- Department of Chemistry University of Southampton Southampton UK
| | | | - Vytautas Klimavicius
- Institute of Chemical Physics Vilnius University Vilnius Lithuania
- Eduard‐Zintl Institute for Inorganic and Physical Chemistry University of Technology Darmstadt Darmstadt Germany
| | - Sergejus Balčiūnas
- Institute of Applied Electrodynamics and Telecommunications Vilnius University Vilnius Lithuania
| | - Jūras Banys
- Institute of Applied Electrodynamics and Telecommunications Vilnius University Vilnius Lithuania
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Janulevicius M, Klimkevičius V, Mikoliunaite L, Vengalis B, Vargalis R, Sakirzanovas S, Plausinaitiene V, Zilinskas A, Katelnikovas A. Ultralight Magnetic Nanofibrous GdPO 4 Aerogel. ACS Omega 2020; 5:14180-14185. [PMID: 32566886 PMCID: PMC7301591 DOI: 10.1021/acsomega.0c01980] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Accepted: 05/21/2020] [Indexed: 05/05/2023]
Abstract
Anisotropic aerogels are promising bulk materials with a porous 3D structure, best known for their large surface area, low density, and extremely low thermal conductivity. Herein, we report the synthesis and some properties of ultralight magnetic nanofibrous GdPO4 aerogels. Our proposed GdPO4 aerogel synthesis route is eco-friendly and does not require any harsh precursors or conditions. The most common route for magnetic aerogel preparation is the introduction of magnetic nanoparticles into the structure during the synthesis procedure. However, the nanofibrous GdPO4 aerogel reported in this work is magnetic by itself already and no additives are required. The hydrogel used for nanofibrous GdPO4 aerogel preparation was synthesized via a hydrothermal route. The hydrogel was freeze-dried and heat-treated to induce a phase transformation from the nonmagnetic trigonal to magnetic monoclinic phase. Density of the obtained magnetic nanofibrous monoclinic GdPO4 aerogel is only ca. 8 mg/cm3.
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Affiliation(s)
- Matas Janulevicius
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Vaidas Klimkevičius
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Lina Mikoliunaite
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
- Center
for Physical Sciences and Technology, Saulėtekio al. 3, 10223 Vilnius, Lithuania
| | - Bonifacas Vengalis
- Center
for Physical Sciences and Technology, Saulėtekio al. 3, 10223 Vilnius, Lithuania
| | - Rokas Vargalis
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Simas Sakirzanovas
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | | | - Albinas Zilinskas
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
| | - Arturas Katelnikovas
- Institute
of Chemistry, Vilnius University, Naugarduko 24, 03225 Vilnius, Lithuania
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5
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Dagys L, Klimkevičius V, Klimavicius V, Aidas K, Makuška R, Balevicius V. CP MAS kinetics in soft matter: Spin diffusion, local disorder and thermal equilibration in poly(2-hydroxyethyl methacrylate). Solid State Nucl Magn Reson 2020; 105:101641. [PMID: 31887667 DOI: 10.1016/j.ssnmr.2019.101641] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 12/02/2019] [Accepted: 12/06/2019] [Indexed: 06/10/2023]
Abstract
The 1H-13C cross-polarization magic angle spinning kinetics was studied in poly(2-hydroxyethyl methacrylate) (pHEMA), i.e. a soft material with high degrees of internal freedom and molecular disorder, having the purpose to track the influence of increasing local incoherent contributions to the effects of coherent nature in the open quantum spin systems. The experimental CP MAS kinetic curves were analyzed in the frame of the models of isotropic and anisotropic spin diffusion with thermal equilibration. The rates of spin diffusion and spin-lattice relaxation as well as the profiles of distribution of dipolar coupling, the parameters accounting the effective size of spin clusters and the local order parameters were determined. The intensities of the peaks of periodic quasi-equilibrium origin gradually decrease with increasing disorder, i.e. going from most ordered to more disordered sites in the polymer. Assuming that the thermal motion induced by the temperature gradients is much faster than the equilibration driven by spin diffusion due the difference in spin temperatures, it was deduced that the thermal equilibration in pHEMA occurs in the time scale of 10-4 s. This is one order of magnitude faster than the spectral spin diffusion, which occurs between spins having different resonance frequencies. The thermal equilibration in the case of remote spin clusters was described by the 'stretched exponent' decay. This led to the fractal dimension Dp ≈ 1.65 for both carbon sites (quaternary and carbonyl). The obtained Dp value corresponds to the aggregates, which images are very similar to those for pHEMA and some other related polymer structures are usually conceived.
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Affiliation(s)
- Laurynas Dagys
- Institute of Chemical Physics, Vilnius University, LT-10257, Vilnius, Lithuania; Department of Chemistry, University of Southampton, SO17 1BJ, Southampton, UK
| | | | - Vytautas Klimavicius
- Institute of Chemical Physics, Vilnius University, LT-10257, Vilnius, Lithuania; Eduard-Zintl Institute for Inorganic and Physical Chemistry, University of Technology Darmstadt, D-64287, Darmstadt, Germany
| | - Kęstutis Aidas
- Institute of Chemical Physics, Vilnius University, LT-10257, Vilnius, Lithuania
| | - Ričardas Makuška
- Institute of Chemistry, Vilnius University, LT-03225, Vilnius, Lithuania
| | - Vytautas Balevicius
- Institute of Chemical Physics, Vilnius University, LT-10257, Vilnius, Lithuania.
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Dobryden I, Steponavičiu Tė M, Klimkevičius V, Makuška R, Dėdinaitė A, Liu X, Corkery RW, Claesson PM. Bioinspired Adhesion Polymers: Wear Resistance of Adsorption Layers. Langmuir 2019; 35:15515-15525. [PMID: 31310126 DOI: 10.1021/acs.langmuir.9b01818] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Mussel adhesive polymers owe their ability to strongly bind to a large variety of surfaces under water to their high content of 3,4-dihydroxy-l-phenylalanine (DOPA) groups and high positive charge. In this work, we use a set of statistical copolymers that contain medium-length poly(ethylene oxide) side chains that are anchored to the surface in three different ways: by means of (i) electrostatic forces, (ii) catechol groups (as in DOPA), and (iii) the combination of electrostatic forces and catechol groups. A nanotribological scanning probe method was utilized to evaluate the wear resistance of the formed layers as a function of normal load. It was found that the combined measurement of surface topography and stiffness provided an accurate assessment of the wear resistance of such thin layers. In particular, surface stiffness maps allowed us to identify the initiation of wear before a clear topographical wear scar was developed. Our data demonstrate that the molecular and abrasive wear resistance on silica surfaces depends on the anchoring mode and follows the order catechol groups combined with electrostatic forces > catechol groups alone > electrostatic forces alone. The devised methodology should be generally applicable for evaluating wear resistance or "robustness" of thin adsorbed layers on a variety of surfaces.
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Affiliation(s)
- Illia Dobryden
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , Drottning Kristinas väg 51 , SE-100 44 Stockholm , Sweden
| | | | - Vaidas Klimkevičius
- Institute of Chemistry , Vilnius University , Naugarduko 24 , LT-03225 Vilnius , Lithuania
| | - Ričardas Makuška
- Institute of Chemistry , Vilnius University , Naugarduko 24 , LT-03225 Vilnius , Lithuania
| | - Andra Dėdinaitė
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , Drottning Kristinas väg 51 , SE-100 44 Stockholm , Sweden
- Division of Bioscience and Materials , RISE Research Institutes of Sweden , SE-114 86 Stockholm , Sweden
| | - Xiaoyan Liu
- School of Chemistry and Chemical Engineering , Shaanxi Normal University , Xi'an 710062 , China
| | - Robert W Corkery
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , Drottning Kristinas väg 51 , SE-100 44 Stockholm , Sweden
| | - Per Martin Claesson
- School of Engineering Sciences in Chemistry, Biotechnology and Health, Department of Chemistry, Division of Surface and Corrosion Science , KTH Royal Institute of Technology , Drottning Kristinas väg 51 , SE-100 44 Stockholm , Sweden
- Division of Bioscience and Materials , RISE Research Institutes of Sweden , SE-114 86 Stockholm , Sweden
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