Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride
Polyampholyte nanogels based on <i>N</i>-isopropylacrylamide (NIPAM), (3-acrylamidopropyl) trimethylammonium chloride (APTAC) and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) were synthesized via conventional redox-initiated free radical copolymerization. The resultant...
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MDPI AG
2022-07-01
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| Series: | Nanomaterials |
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| author | Aigerim Ye. Ayazbayeva Alexey V. Shakhvorostov Iskander Sh. Gussenov Tulegen M. Seilkhanov Vladimir O. Aseyev Sarkyt E. Kudaibergenov |
| author_facet | Aigerim Ye. Ayazbayeva Alexey V. Shakhvorostov Iskander Sh. Gussenov Tulegen M. Seilkhanov Vladimir O. Aseyev Sarkyt E. Kudaibergenov |
| author_sort | Aigerim Ye. Ayazbayeva |
| collection | DOAJ |
| description | Polyampholyte nanogels based on <i>N</i>-isopropylacrylamide (NIPAM), (3-acrylamidopropyl) trimethylammonium chloride (APTAC) and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) were synthesized via conventional redox-initiated free radical copolymerization. The resultant nanogels of various compositions, specifically [NIPAM]:[APTAC]:[AMPS] = 90:5:5; 90:7.5:2.5; 90:2.5:7.5 mol.%, herein abbreviated as NIPAM<sub>90</sub>-APTAC<sub>5</sub>-AMPS<sub>5</sub>, NIPAM<sub>90</sub>-APTAC<sub>7.5</sub>-AMPS<sub>2.5</sub> and NIPAM<sub>90</sub>-APTAC<sub>2.5</sub>-AMPS<sub>7.5</sub>, were characterized by a combination of <sup>1</sup>H NMR and FTIR spectroscopy, TGA, UV–Vis, DLS and zeta potential measurements. The temperature and salt-responsive properties of amphoteric nanogels were studied in aqueous and saline solutions in a temperature range from 25 to 60 °C and at ionic strengths (μ) of 10<sup>−3</sup> to 1M NaCl. Volume phase transition temperatures (VPTT) of the charge-balanced nanogel were found to reach a maximum upon the addition of salt, whereas the same parameter for the charge-imbalanced nanogels exhibited a sharp decrease at higher saline concentrations. A wide bimodal distribution of average hydrodynamic sizes of nanogel particles had a tendency to transform to a narrow monomodal peak at elevated temperatures and higher ionic strengths. According to the DLS results, increasing ionic strength results in the clumping of nanogel particles. |
| first_indexed | 2024-03-09T06:06:20Z |
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| id | doaj.art-6dfef3f28cd04b60a0b1583e292436c7 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-09T06:06:20Z |
| publishDate | 2022-07-01 |
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| series | Nanomaterials |
| spelling | doaj.art-6dfef3f28cd04b60a0b1583e292436c72023-12-03T12:03:07ZengMDPI AGNanomaterials2079-49912022-07-011214234310.3390/nano12142343Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium ChlorideAigerim Ye. Ayazbayeva0Alexey V. Shakhvorostov1Iskander Sh. Gussenov2Tulegen M. Seilkhanov3Vladimir O. Aseyev4Sarkyt E. Kudaibergenov5Laboratory of Functional Polymers, Institute of Polymer Materials and Technology, Almaty 050019, KazakhstanLaboratory of Functional Polymers, Institute of Polymer Materials and Technology, Almaty 050019, KazakhstanLaboratory of Functional Polymers, Institute of Polymer Materials and Technology, Almaty 050019, KazakhstanLaboratory of NMR-Spectroscopy, Sh. Ualikhanov University, Kokshetau 020000, KazakhstanDepartment of Chemistry, University of Helsinki, 00014 Helsinki, FinlandLaboratory of Functional Polymers, Institute of Polymer Materials and Technology, Almaty 050019, KazakhstanPolyampholyte nanogels based on <i>N</i>-isopropylacrylamide (NIPAM), (3-acrylamidopropyl) trimethylammonium chloride (APTAC) and 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) were synthesized via conventional redox-initiated free radical copolymerization. The resultant nanogels of various compositions, specifically [NIPAM]:[APTAC]:[AMPS] = 90:5:5; 90:7.5:2.5; 90:2.5:7.5 mol.%, herein abbreviated as NIPAM<sub>90</sub>-APTAC<sub>5</sub>-AMPS<sub>5</sub>, NIPAM<sub>90</sub>-APTAC<sub>7.5</sub>-AMPS<sub>2.5</sub> and NIPAM<sub>90</sub>-APTAC<sub>2.5</sub>-AMPS<sub>7.5</sub>, were characterized by a combination of <sup>1</sup>H NMR and FTIR spectroscopy, TGA, UV–Vis, DLS and zeta potential measurements. The temperature and salt-responsive properties of amphoteric nanogels were studied in aqueous and saline solutions in a temperature range from 25 to 60 °C and at ionic strengths (μ) of 10<sup>−3</sup> to 1M NaCl. Volume phase transition temperatures (VPTT) of the charge-balanced nanogel were found to reach a maximum upon the addition of salt, whereas the same parameter for the charge-imbalanced nanogels exhibited a sharp decrease at higher saline concentrations. A wide bimodal distribution of average hydrodynamic sizes of nanogel particles had a tendency to transform to a narrow monomodal peak at elevated temperatures and higher ionic strengths. According to the DLS results, increasing ionic strength results in the clumping of nanogel particles.https://www.mdpi.com/2079-4991/12/14/2343polyampholyte nanogelsthermal responsesalt responsephase transition temperaturehydrophobic/hydrophilic balance |
| spellingShingle | Aigerim Ye. Ayazbayeva Alexey V. Shakhvorostov Iskander Sh. Gussenov Tulegen M. Seilkhanov Vladimir O. Aseyev Sarkyt E. Kudaibergenov Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride Nanomaterials polyampholyte nanogels thermal response salt response phase transition temperature hydrophobic/hydrophilic balance |
| title | Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride |
| title_full | Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride |
| title_fullStr | Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride |
| title_full_unstemmed | Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride |
| title_short | Temperature and Salt Responsive Amphoteric Nanogels Based on <i>N</i>-Isopropylacrylamide, 2-Acrylamido-2-methyl-1-propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride |
| title_sort | temperature and salt responsive amphoteric nanogels based on i n i isopropylacrylamide 2 acrylamido 2 methyl 1 propanesulfonic acid sodium salt and 3 acrylamidopropyl trimethylammonium chloride |
| topic | polyampholyte nanogels thermal response salt response phase transition temperature hydrophobic/hydrophilic balance |
| url | https://www.mdpi.com/2079-4991/12/14/2343 |
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