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Racles C, Asandulesa M, Tiron V, Tugui C, Vornicu N, Ciubotaru BI, Mičušík M, Omastová M, Vasiliu AL, Ciomaga C. Elastic composites with PDMS matrix and polysulfone-supported silver nanoparticles as filler. POLYMER 2021. [DOI: 10.1016/j.polymer.2021.123480] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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2
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Pan Y, Zholobko O, Li H, Jin J, Hu J, Chen B, Voronov A, Yang Z. Spatial Distribution and Solvent Polarity-Triggered Release of a Polypeptide Incorporated into Invertible Micellar Assemblies. ACS APPLIED MATERIALS & INTERFACES 2020; 12:12075-12082. [PMID: 32057221 DOI: 10.1021/acsami.9b22435] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Extracting, stabilizing, or delivering biomacromolecules such as proteins and peptides in organic phases have potential applications in biocatalysis, protein extraction, and food antioxidation. However, most current delivery/stabilization platforms face various limitations such as protein/peptide molecular size, platform stability/reusability, and/or potential damage to the cargos. A potential solution to these problems is micellar self-assemblies from amphiphilic invertible polymers, which have recently been demonstrated to be powerful as molecular hosts to deliver both small molecular drugs and functional polypeptides in the aqueous phase. To better understand the function of biomacromolecules and predict the usefulness of the formed invertible micellar assemblies (IMAs) as biomacromolecular hosts in organic phases, it is critical to characterize the spatial distribution, structure, and dynamics of biomacromolecules in the IMA including those upon release. However, the background signals of the IMAs limit the application of most peptide characterization approaches. In this work, we overcome the technical barriers by using site-directed spin labeling electron paramagnetic resonance to probe the spatial arrangement and release of a model, the hemagglutinin (HA) peptide, in the IMAs formed from two different amphiphilic invertible polymers. By site-specifically probing three residues along the peptide chain, for the first time, we depict the possible spatial distribution of HA within the IMAs. By triggering the disassembly of the IMAs with a thermodynamically good solvent (in this study, acetone), we detailed the stability of IMAs in toluene and the peptide release conditions once the polarity of the medium changes. Our findings are important for the application of peptides/proteins at the polar-nonpolar interface or using this interface to extract or deliver biomacromolecules. Our work also demonstrates the power of SDSL-EPR on probing peptide or micelle dynamics, which can be generalized to understand proteins or other biomacromolecules in micellar polymer assemblies in varied applications.
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Affiliation(s)
- Yanxiong Pan
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58102, United States
| | - Oksana Zholobko
- Coatings and Polymeric Materials Department, North Dakota State University, Fargo, North Dakota 58108, United States
| | - Hui Li
- Department of Plant Sciences, North Dakota State University, Fargo, North Dakota 58102, United States
| | - Jing Jin
- Magnetic Resonance Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Jinlian Hu
- Institute of Textiles and Clothing, The Hong Kong Polytechnic University, Hong Kong 999077, China
| | - Bingcan Chen
- Department of Plant Sciences, North Dakota State University, Fargo, North Dakota 58102, United States
| | - Andriy Voronov
- Coatings and Polymeric Materials Department, North Dakota State University, Fargo, North Dakota 58108, United States
| | - Zhongyu Yang
- Department of Chemistry and Biochemistry, North Dakota State University, Fargo, North Dakota 58102, United States
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Singh G, Zholobko O, Pillatzki A, Webb B, Nelson E, Voronov A, Ramamoorthy S. An amphiphilic invertible polymer as a delivery vehicle for a M2e-HA2-HA1 peptide vaccine against an Influenza A virus in pigs. Vaccine 2019; 37:4291-4301. [PMID: 31235376 DOI: 10.1016/j.vaccine.2019.06.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Revised: 06/11/2019] [Accepted: 06/17/2019] [Indexed: 12/18/2022]
Abstract
Influenza A viruses (IAVs) are a group of genetically diverse and economically important zoonotic pathogens. Despite decades of research, effective and broadly protective vaccines are yet to be developed. Recent breakthroughs in epitope-based immunization for influenza viruses identify certain conserved regions of the HA2 and M2e proteins as capable of inducing broad protection against multiple influenza strains. The M2e and HA2 peptides have been evaluated in mice but not as a combination in pigs, which play an important role in the transmission and evolution of IAV. Peptides are inherently weak immunogens; and effective delivery of peptide antigens is challenging. To enhance the delivery and immunogenicity of peptide-based vaccines, the conserved M2e and HA2 and a strain-specific HA1 epitope of Influenza A (H1N1) pdm09 were expressed as a chain in a bacterial expression system and entrapped in a novel amphiphilic invertible polymer made from polyethyelene glycol (PEG, molecular weight 600 g/mol) and polytetrahydrofuran (PTHF, molecular weight 650 g/mol), PEG600PTHF650. Piglets vaccinated with polymeric peptide vaccine mounted significantly stronger antibody responses against the peptide construct when compared to piglets immunized with the multi-epitope peptide alone. When vaccinated pigs were challenged with Influenza A (H1N1) pdm09, viral shedding in nasal secretions and lung lesion scores were significantly reduced when compared to the unvaccinated controls and pigs vaccinated with the peptide alone at six days post-challenge. Thus, the combination of the PEG600PTHF650 polymer and trimeric peptide construct enhanced delivery of the peptide antigen, acted as an adjuvant in stimulating strong antibody responses, reduced the effects of viral infection in vaccinated pigs.
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Affiliation(s)
- Gagandeep Singh
- Department of Microbiological Sciences, N. Dakota State University, Fargo, ND, United States
| | - Oksana Zholobko
- Department of Coatings and Polymeric Materials, N. Dakota State University, Fargo, ND, United States
| | - Angela Pillatzki
- Animal Disease Research and Diagnostic Laboratory, S. Dakota State University, Brookings, SD, United States
| | - Brett Webb
- Veterinary Diagnostic Laboratory, N. Dakota State University, Fargo, ND, United States
| | - Eric Nelson
- Animal Disease Research and Diagnostic Laboratory, S. Dakota State University, Brookings, SD, United States
| | - Andriy Voronov
- Department of Coatings and Polymeric Materials, N. Dakota State University, Fargo, ND, United States
| | - Sheela Ramamoorthy
- Department of Microbiological Sciences, N. Dakota State University, Fargo, ND, United States.
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Jatoi AW, Kim IS, Ni QQ. A comparative study on synthesis of AgNPs on cellulose nanofibers by thermal treatment and DMF for antibacterial activities. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 98:1179-1195. [DOI: 10.1016/j.msec.2019.01.017] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Revised: 12/25/2018] [Accepted: 01/04/2019] [Indexed: 11/15/2022]
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Tolstov A, Matyushov V, Klymchuk D, Lebedev E. Peculiarities of structure formation and the properties of silver-containing polymer composites based on chemically modified melamine-formaldehyde polymer. Polym J 2019. [DOI: 10.15407/polymerj.41.01.026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Kohut A, Zholobko O, Hevus I, Voronov A. 1
H NMR Study of “Host-Guest” Interactions of Micellar Assemblies from Amphiphilic Invertible Polymers and Peptides. MACROMOL CHEM PHYS 2017. [DOI: 10.1002/macp.201700344] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ananiy Kohut
- Department of Organic Chemistry; Lviv Polytechnic National University; vul. S. Bandery 12 Lviv 79013 Ukraine
| | - Oksana Zholobko
- Department of Coatings and Polymeric Materials; North Dakota State University; Department 2760, P.O. Box 6050 Fargo ND 58108-6050 USA
| | - Ivan Hevus
- Department of Coatings and Polymeric Materials; North Dakota State University; Department 2760, P.O. Box 6050 Fargo ND 58108-6050 USA
| | - Andriy Voronov
- Department of Coatings and Polymeric Materials; North Dakota State University; Department 2760, P.O. Box 6050 Fargo ND 58108-6050 USA
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Kudina O, Kohut A, Tarnavchyk I, Hevus I, Voronov A. Solvent-responsive self-assembly of amphiphilic invertible polymers determined with SANS. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3310-3318. [PMID: 24606021 DOI: 10.1021/la404939w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Amphiphilic invertible polymers (AIPs) are a new class of macromolecules that self-assemble into micellar structures and rapidly change structure in response to changes in solvent polarity. Using small-angle neutron scattering (SANS) data, we obtained a quantitative description of the invertible micellar assemblies (IMAs). The detailed composition and size of the assemblies (including the effect of temperature) were measured in aqueous and toluene polymer solutions. The results show that the invertible macromolecules self-assemble into cylindrical core-shell micellar structures. The composition of the IMAs in aqueous and toluene solutions was used to reveal the inversion mechanism by changing the polarity of the medium. Our experiments demonstrate that AIP unimers self-assemble into IMAs in aqueous solution, predominantly through interactions between the hydrophobic moieties of macromolecules. The hydrophobic effect (or solvophobic interaction) is the major driving force for self-assembly. When the polarity of the environment is changed from polar to nonpolar, poly(ethylene glycol) (PEG) and aliphatic dicarboxylic acid fragments of AIP macromolecules tend to replace each other in the core and the shell of the IMAs. However, neither the interior nor the exterior of the IMAs consists of fragments of a single component of the macromolecule. In aqueous solution, with the temperature increasing from 15 to 35 °C, the IMAs' mixed core from aliphatic dicarboxylic acid and PEG moieties and PEG-based shell change the structure. As a result of the progressive dehydration of the macromolecules, the hydration level (water content) in the micellar core decreases at 25 °C, followed by dehydrated PEG fragments entering the interior of the IMAs when the temperature increases to 35 °C.
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Affiliation(s)
- Olena Kudina
- Department of Coatings and Polymeric Materials, North Dakota State University , Fargo, North Dakota 58108-6050 United States
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Kohut A, Voronov A, Voronov S. Micellization and Adsolubilization of Amphilic Invertible Polyesters. CHEMISTRY & CHEMICAL TECHNOLOGY 2014. [DOI: 10.23939/chcht08.01.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Tolstov AL. Production and Physicochemical Characteristics of Silver-Containing Polyurethane Systems. THEOR EXP CHEM+ 2014. [DOI: 10.1007/s11237-014-9336-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Zhang AQ, Cai LJ, Sui L, Qian DJ, Chen M. Reducing Properties of Polymers in the Synthesis of Noble Metal Nanoparticles. POLYM REV 2013. [DOI: 10.1080/15583724.2013.776587] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Vasylyev S, Damm C, Segets D, Hanisch M, Taccardi N, Wasserscheid P, Peukert W. Synthesis of silver nanoparticles in melts of amphiphilic polyesters. NANOTECHNOLOGY 2013; 24:115604. [PMID: 23449006 DOI: 10.1088/0957-4484/24/11/115604] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The current work presents a one-step procedure for the synthesis of amphiphilic silver nanoparticles suitable for production of silver-filled polymeric materials. This solvent free synthesis via reduction of Tollens' reagent as silver precursor in melts of amphiphilic polyesters consisting of hydrophilic poly(ethylene glycol) blocks and hydrophobic alkyl chains allows the production of silver nanoparticles without any by-product formation. This makes them especially interesting for the production of medical devices with antimicrobial properties. In this article the influences of the chain length of the hydrophobic block in the amphiphilic polyesters and the process temperature on the particle size distribution (PSD) and the stability of the particles against agglomeration are discussed. According to the results of spectroscopic and viscosimetric investigations the silver precursor is reduced to elemental silver nanoparticles by a single electron transfer process from the poly(ethylene glycol) chain to the silver ion.
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Affiliation(s)
- S Vasylyev
- Institute of Particle Technology, Friedrich-Alexander University Erlangen-Nuremberg, Erlangen, Germany
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Caramia V, Bayer IS, Anyfantis GC, Ruffilli R, Ayadi F, Martiradonna L, Cingolani R, Athanassiou A. Tailoring the morphology of poly(ethylene oxide)/silver triflate blends: from crystalline to self-assembled nanofibrillar structures. NANOTECHNOLOGY 2013; 24:055602. [PMID: 23306910 DOI: 10.1088/0957-4484/24/5/055602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Interaction of polyethylene oxide (PEO) with transition metal triflates is a newly emerging research area due to its numerous application fields, such as thin-film power conversion devices and sensors. In the present study, we demonstrate, for the first time, that PEO can solvate silver triflate organic salts in large quantities when formic acid is used as a common solvent for both. Nanocomposites with unique structural and electrical properties are fabricated by simply drop casting formic acid solutions of PEO and silver triflate salts. We present a detailed experimental study on the characterization of morphological and electrical properties of PEO-silver triflate nanocomposite films as a function of silver triflate concentration and discuss their potential applications as humidity sensors. In particular, by increasing the concentration of the salt in the initial solution the morphological features of the formed nanocomposites can be varied from well defined microcrystals to amorphous nanofibers. Of special interest are the nanocomposite films fabricated from a 1:1 (PEO-unit:Ag(+)) molar ratio, since they consist of self-assembled nanofibrillar structures, which exhibit good electrical conductivity as well as highly repeatable sensitivity towards humidity.
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Affiliation(s)
- Vincenzo Caramia
- Nanophysics, Istituto Italiano di Tecnologia, via Morego 30, I-16163 Genova, Italy
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Nekrasova TN, Zolotova YI, Nazarova OV, Levit ML, Suvorova EI, Sirotkin AK, Baklagina YG, Didenko EV, Pautov VD, Panarin EF. Silver nanocomposites based on (Co)polymers of 2-deoxy-2-methacrylamido-D-glucose, N-vinylamides, and aminoacrylates. DOKLADY CHEMISTRY 2012. [DOI: 10.1134/s0012500812100035] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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14
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Tolstov AL, Lebedev EV. Features of the stabilization of silver nanoparticles by carbonyl-containing polymers. THEOR EXP CHEM+ 2012. [DOI: 10.1007/s11237-012-9264-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hevus I, Modgil A, Daniels J, Kohut A, Sun C, Stafslien S, Voronov A. Invertible micellar polymer assemblies for delivery of poorly water-soluble drugs. Biomacromolecules 2012; 13:2537-45. [PMID: 22759064 DOI: 10.1021/bm3007924] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Strategically designed amphiphilic invertible polymers (AIPs) are capable of (i) self-assembling into invertible micellar assemblies (IMAs) in response to changes in polarity of environment, polymer concentration, and structure, (ii) accommodating (solubilizing) substances that are otherwise insoluble in water, and (iii) inverting their molecular conformation in response to changes in the polarity of the local environment. The unique ability of AIPs to invert the molecular conformation depending on the polarity of the environment can be a decisive factor in establishing the novel stimuli-responsive mechanism of solubilized drug release that is induced just in response to a change in the polarity of the environment. The IMA capability to solubilize lipophilic drugs and deliver and release the cargo molecules by conformational inversion of polymer macromolecules in response to a change of the polarity of the environment was demonstrated by loading IMA with a phytochemical drug, curcumin. It was demonstrated that four sets of micellar vehicles based on different AIPs were capable of delivering the curcumin from water to an organic medium (1-octanol) by means of unique mechanism: AIP conformational inversion in response to changing polarity from polar to nonpolar. The IMAs are shown to be nontoxic against human cells up to a concentration of 10 mg/L. On the other hand, the curcumin-loaded IMAs are cytotoxic to breast carcinoma cells at this concentration, which confirms the potential of IMA-based vehicles in controlled delivery of poorly water-soluble drug candidates and release by means of this novel stimuli-responsive mechanism.
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Affiliation(s)
- Ivan Hevus
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108, United States
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Kohut A, Kudina O, Dai X, Schulz DL, Voronov A. Host-guest interactions between a nonmicellized amphiphilic invertible polymer and insoluble cyclohexasilane in acetonitrile. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10356-10359. [PMID: 21797281 DOI: 10.1021/la201883f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Host-guest interactions between cyclohexasilane (Si(6)H(12)) and amphiphilic invertible macromolecules based on PEG and sebacic acid in acetonitrile (neither a solvent for cyclohexasilane nor a support for the micellization of amphiphilic invertible macromolecules) have been investigated. Despite the extended conformation of the macromolecules and the absence of self-assembled polymeric domains, a macromolecular amphiphilicity itself contributes to localizing Si(6)H(12) by AIP and thus enables Lewis acid-base interactions between Si(6)H(12) and the AIP carbonyl groups. The obtained results demonstrate an interesting phenomenon in that insoluble Si(6)H(12) can be localized by AIP macromolecules in a medium that does not support the formation of polymeric domains.
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Affiliation(s)
- Ananiy Kohut
- Department of Coatings and Polymeric Materials, North Dakota State University, P.O. Box 6050, Fargo, North Dakota 58108-6050, USA
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Damm C, Segets D, Yang G, Vieweg BF, Spiecker E, Peukert W. Shape transformation mechanism of silver nanorods in aqueous solution. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:147-156. [PMID: 21132708 DOI: 10.1002/smll.201001600] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
The spontaneous shape transformation of silver nanorods with an initial length of several hundred nanometers towards spherical particle shapes in aqueous solution is investigated by means of scanning electron microscopy, UV-vis absorption spectroscopy, anodic stripping voltammetry, and high-resolution transmission electron microscopy (HRTEM). The consolidation of the results reveals an increase in the particle number density with time. Moreover, HRTEM image analysis along the cross section of the rods evidences the presence of fivefold twinning defects which extend along the whole rod length. According to the analytical model of Monk et al. this kind of rod structure is only thermodynamically stable if the rod length is below a critical value at a given diameter. The rods investigated in the present work do not fulfill the stability criterion as they exceed the critical length. Thus, the rods decay into smaller "nanobuns" and defective as well as defect-free spheres. A mechanism based on findings from the literature, HRTEM image analysis of former rods, transition states, and the final particle structures is proposed. The defects along the surface are seen as starting points for the dissolution of material, which is reintegrated into the solid phase by homogeneous as well as heterogeneous nucleation and growth.
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Affiliation(s)
- Cornelia Damm
- Institute of Particle Technology, Friedrich-Alexander-University of Erlangen-Nuremberg, 91058 Erlangen, Germany
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Triebel C, Vasylyev S, Damm C, Stara H, Özpınar C, Hausmann S, Peukert W, Münstedt H. Polyurethane/silver-nanocomposites with enhanced silver ion release using multifunctional invertible polyesters. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03487h] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hevus I, Kohut A, Voronov A. Interfacial micellar phase transfer using amphiphilic invertible polymers. Polym Chem 2011. [DOI: 10.1039/c1py00399b] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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WANG H, CHEN D, WEI Y, CHANG Y, ZHAO J. A Simple and Sensitive Assay of Gallic Acid Based on Localized Surface Plasmon Resonance Light Scattering of Silver Nanoparticles through Modified Tollens Process. ANAL SCI 2011; 27:937-41. [DOI: 10.2116/analsci.27.937] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Huiying WANG
- College of Chemical Engineering, Shijiazhuang University
| | - Dinglong CHEN
- College of Chemical Engineering, Shijiazhuang University
| | - Yongju WEI
- College of Chemistry and Material Science, Hebei Normal University
| | - Yongfang CHANG
- College of Chemical Engineering, Shijiazhuang University
| | - Jianlu ZHAO
- College of Chemical Engineering, Shijiazhuang University
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Sieburg L, Kohut A, Kislenko V, Voronov A. Amphiphilic invertible polymers for adsolubilization on hydrophilic and hydrophobized silica nanoparticles. J Colloid Interface Sci 2010; 351:116-21. [DOI: 10.1016/j.jcis.2010.07.061] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2010] [Revised: 07/23/2010] [Accepted: 07/24/2010] [Indexed: 10/19/2022]
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Hevus I, Kohut A, Voronov A. Amphiphilic Invertible Polyurethanes: Synthesis and Properties. Macromolecules 2010. [DOI: 10.1021/ma101175k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ivan Hevus
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108
| | - Ananiy Kohut
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108
| | - Andriy Voronov
- Department of Coatings and Polymeric Materials, North Dakota State University, Fargo, North Dakota 58108
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Tarnavchyk I, Voronov A, Kohut A, Nosova N, Varvarenko S, Samaryk V, Voronov S. Reactive Hydrogel Networks for the Fabrication of Metal-Polymer Nanocomposites. Macromol Rapid Commun 2009; 30:1564-9. [DOI: 10.1002/marc.200900285] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2009] [Accepted: 05/11/2009] [Indexed: 11/12/2022]
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Kohut A, Voronov A. Hierarchical micellar structures from amphiphilic invertible polyesters: 1H NMR spectroscopic study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4356-4360. [PMID: 19309118 DOI: 10.1021/la900700u] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The environment-dependent behavior of invertible polyesters has been studied by 1H NMR spectroscopy. In dilute toluene solutions, the micelle exterior is made up of the lipophilic fragments, and the interior consists of the hydrophilic constituents. The polyester inverts the structure in an aqueous medium to form micelles with a hydrophobic inner part and a hydrophilic outer part. Increasing polyester concentration leads to the formation of hierarchical structures both in toluene and in an aqueous medium as a result of the aggregation of unimolecular micelles and the formation of hydrophilic and lipophilic domains. On the contrary, no unimolecular micelles or micellar aggregation has been observed in acetone or chloroform.
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Affiliation(s)
- Ananiy Kohut
- Department of Coatings & Polymeric Materials, North Dakota State University, Fargo, North Dakota, USA
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