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Huang R, Yang S, Hu Z, Peng B, Zhu Y, Cheng T, Liu G. Bridging the incompatibility gap in dual asymmetric catalysis over a thermoresponsive hydrogel-supported catalyst. Commun Chem 2024; 7:2. [PMID: 38172516 PMCID: PMC10764871 DOI: 10.1038/s42004-023-01085-z] [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: 06/27/2023] [Accepted: 12/07/2023] [Indexed: 01/05/2024] Open
Abstract
The integration of dual asymmetric catalysis is highly beneficial for the synthesis of organic molecules with multiple stereocenters. However, two major issues that need to be addressed are the intrinsic deactivation of dual-species and the extrinsic conflict of reaction conditions. To overcome these concerns, we have utilized the compartmental and thermoresponsive properties of poly(N-isopropylacrylamide) (PNIPAM) to develop a cross-linked PNIPAM-hydrogel-supported bifunctional catalyst. This catalyst is designed with Rh(diene) species situated on the outer surface and Ru(diamine) species positioned within the interior of the hydrogel. The compartmental function of PNIPAM in the middle overcomes intrinsic mutual deactivations between the dual-species. The thermoresponsive nature of PNIPAM allows for precise control of catalytic pathways in resolving external conflicts by controlling the reaction switching between an Rh-catalyzed enantioselective 1,4-addition at 50°C and a Ru-catalyzed asymmetric transfer hydrogenation (ATH) at 25°C. As we envisioned, this sequential 1,4-addition/reduction dual enantioselective cascade reaction achieves a transformation from incompatibility to compatibility, resulting in direct access to γ-substituted cyclic alcohols with dual stereocenters in high yields and enantio/diastereoselectivities. Mechanistic investigation reveals a reversible temperature transition between 50°C and 25°C, ensuring a cascade process comprising a 1,4-addition followed by the ATH process.
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Affiliation(s)
- Renfu Huang
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China
| | - Shoujin Yang
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China
| | - Zhipeng Hu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China
| | - Bangtai Peng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China
| | - Yuanli Zhu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China
| | - Tanyu Cheng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China
| | - Guohua Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, No.100 Guilin Rd, Shanghai, China.
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Bochenek S, Rudov AA, Sassmann T, Potemkin II, Richtering W. Influence of Architecture on the Interfacial Properties of Polymers: Linear Chains, Stars, and Microgels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:18354-18365. [PMID: 38059308 DOI: 10.1021/acs.langmuir.3c02470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/08/2023]
Abstract
Surface-active polymers have important applications as effective and responsive emulsifiers, foaming agents, and coatings. In this contribution, we explore the impact of the polymer architecture on the behavior at oil-water interfaces by comparing different poly(N-isopropylacrylamide) (pNIPAM)-based systems, namely, monolayers of linear and star-shaped macromolecules, ultralow cross-linked, regular cross-linked, and hollow microgels. Compression isotherms were determined experimentally as well as by computer simulations. The latter provides information about the conformational changes of the individual macromolecules as well as the interfacial properties of the monolayer, including the surface structure and the density distribution of an ensemble of interacting macromolecules near an interface. Surprisingly, the isotherms of the linear polymer, of the star polymer, and of the ultralow cross-linked microgel have an identical shape that differs from the isotherms of regular and hollow microgels. We introduced the mass fraction of adsorbed polymer, which gives a measure of the polymer segments contributing to the isotherm in relation to the most flexible architecture, i.e., the linear polymer, and allows a comparison of polymers with different architectures. The data demonstrate that increasing the number of cross-links leads to a significantly lower amount of polymer in the proximity of the interface as the increase in cross-linker reduces the deformability or softness of the polymers at the interface. The volume fraction profiles along the normal to the interface are essentially different in the microgel monolayers as compared to those in the linear and star polymer. The profiles through the microgel contact line and their growth upon initial compression are similar to those of the linear chains. Herewith, the profiles through the center of mass practically do not change upon compression. Therefore, the initial growth in the microgel surface pressure reveals the polymer-like behavior and is related to the deformation of the peripheral part of the microgel. Further compression of the microgel monolayer leads to 3D interactions of the microgels within the aqueous side of the interface and soft colloid-like behavior.
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Affiliation(s)
- Steffen Bochenek
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany, European Union
| | - Andrey A Rudov
- DWI - Leibniz Institute for Interactive Materials, 52056 Aachen, Germany, European Union
| | - Tim Sassmann
- DWI - Leibniz Institute for Interactive Materials, 52056 Aachen, Germany, European Union
| | - Igor I Potemkin
- DWI - Leibniz Institute for Interactive Materials, 52056 Aachen, Germany, European Union
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52056 Aachen, Germany, European Union
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3
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Huang L, Liang M, Fang Y, Kim J, Yang Y, Huang Z. Protonic recognition and assembly for the creation of porous Brønsted acid catalysts with enhanced catalytic efficiency. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.108080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Van Tran V, Wi E, Shin SY, Lee D, Kim YA, Ma BC, Chang M. Microgels based on 0D-3D carbon materials: Synthetic techniques, properties, applications, and challenges. CHEMOSPHERE 2022; 307:135981. [PMID: 35964721 DOI: 10.1016/j.chemosphere.2022.135981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2022] [Revised: 07/22/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Microgels are three-dimensional (3D) colloidal hydrogel particles with outstanding features such as biocompatibility, good mechanical properties, tunable sizes from submicrometer to tens of nanometers, and large surface areas. Because of these unique qualities, microgels have been widely used in various applications. Carbon-based materials (CMs) with various dimensions (0-3D) have recently been investigated as promising candidates for the design and fabrication of microgels because of their large surface area, excellent conductivity, unique chemical stability, and low cost. Here, we provide a critical review of the specific characteristics of CMs that are being incorporated into microgels, as well as the state-of-the art applications of CM-microgels in pollutant adsorption and photodegradation, H2 evoluation, CO2 capture, soil conditioners, water retention, drug delivery, cell encapsulation, and tissue engineering. Advanced preparation techniques for CM-microgel systems are also summarized and discussed. Finally, challenges related to the low colloidal stability of CM-microgels and development strategies are examined. This review shows that CM-microgels have the potential to be widely used in various practical applications.
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Affiliation(s)
- Vinh Van Tran
- Laser and Thermal Engineering Laboratory, Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Eunsol Wi
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea
| | - Seo Young Shin
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea
| | - Daeho Lee
- Laser and Thermal Engineering Laboratory, Department of Mechanical Engineering, Gachon University, Seongnam, 13120, South Korea
| | - Yoong Ahm Kim
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea; School of Polymer Science and Engineering, Chonnam National University, Gwangju, 61186, South Korea; Alan G. MacDiarmid Energy Research Institute, Chonnam National University, Gwangju, 61186, South Korea
| | - Byung Chol Ma
- School of Chemical Engineering, Chonnam National University, Gwangju, 61186, South Korea.
| | - Mincheol Chang
- Department of Polymer Engineering, Graduate School, Chonnam National University, Gwangju, 61186, South Korea; School of Polymer Science and Engineering, Chonnam National University, Gwangju, 61186, South Korea; Alan G. MacDiarmid Energy Research Institute, Chonnam National University, Gwangju, 61186, South Korea.
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Liang W, Lopez CG, Richtering W, Wöll D. Photo- and thermo-responsive microgels with supramolecular crosslinks for wavelength tunability of the volume phase transition temperature. Phys Chem Chem Phys 2022; 24:14408-14415. [PMID: 35642955 DOI: 10.1039/d2cp00532h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Functional microgels have powerful applications, especially due to their quick responsiveness to different external stimuli such as temperature, pH, ionic strength, solvent composition and light. Here, we describe the synthesis of novel dual-responsive poly(N-isopropylacrylamide) (PNIPAM) microgels and demonstrate that, in addition to temperature, light changes their properties. The crosslinks inside the microgels were achieved by the host-guest interactions between the trans azobenzene (transAzo) and β-cyclodextrin (βCD) units. transAzo can be photoisomerized to cisAzo which exhibits significant lower binding affinity to βCD. As a consequence, the crosslink density, and thus several microgel properties, can be controlled by light irradiation. Surprisingly, this irradiation with light can significantly change the volume phase transition temperature (VPTT) by several degrees centigrade, presumably due to the fact that the polar βCD shields the transAzo bound to it, whereas the unbound cisAzo is rather apolar. As a result, continuous irradiation with specific wavelengths until reaching the respective photostationary state allows for a full control over the VPTT within the physiologically relevant range between 32 °C and 38 °C.
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Affiliation(s)
- Wenjing Liang
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany.
| | - Carlos G Lopez
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany.
| | - Walter Richtering
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany.
| | - Dominik Wöll
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany.
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Dong S, Zang Q, Ma ZY, Tang M, Xu ZK, Nie J, Du B, Sun JZ, Tang BZ. Thermosensitive Microgels Containing AIEgens: Enhanced Luminescence and Distinctive Photochromism for Dynamic Anticounterfeiting. ACS APPLIED MATERIALS & INTERFACES 2022; 14:17794-17805. [PMID: 35404060 DOI: 10.1021/acsami.2c01620] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The proposal of the aggregation-induced emission (AIE) effect shines a light on the practical application of luminescent materials. The AIE-active luminescence microgels (TPEC MGs) with photo-induced color-changing behavior were developed by integrating positively charged AIE luminogens (AIEgens) into the anionic network of microgels, where AIEgens of TPEC were obtained from the quaternization reaction between tetra-(4-pyridylphenyl)ethylene (TPE-4Py) and 7-(6-bromohexyloxy)-coumarin. The aqueous suspensions of TPEC MGs exhibit a significant AIE effect following the enhancement of quantum yield. In addition, further increase in fluorescence intensity and blueshift occur at elevated temperatures due to the collapse of microgels. The distinctive photochromic behavior of TPEC MGs was observed, which presents as the transition from orange-yellow to blue-green color under UV irradiation, which is different from TPEC in good organic solvents. The phenomenon of color changing can be ascribed to the competition between photodimerization of the coumarin part and photocyclization of TPE-4Py in TPEC. The photochromic TPEC MG aqueous suspensions can be conducted as aqueous microgel inks for information display, encryption, and dynamic anticounterfeiting.
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Affiliation(s)
- Shunni Dong
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qiguang Zang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Zhao-Yu Ma
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Meiqi Tang
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Zhi-Kang Xu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jingjing Nie
- Department of Chemistry, Zhejiang University, Hangzhou 310027, China
| | - Binyang Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Jing Zhi Sun
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science & Engineering, Zhejiang University, Hangzhou 310027, China
| | - Ben Zhong Tang
- Shenzhen Institute of Aggregate Science and Technology, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, 2001 Longxiang Boulevard, Longgang District, Shenzhen 518172, China
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7
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Schmidt BVKJ. Multicompartment Hydrogels. Macromol Rapid Commun 2022; 43:e2100895. [PMID: 35092101 DOI: 10.1002/marc.202100895] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 01/27/2022] [Indexed: 11/11/2022]
Abstract
Hydrogels belong to the most promising materials in polymer and materials science at the moment. As they feature soft and tissue-like character as well as high water-content, a broad range of applications are addressed with hydrogels, e.g. tissue engineering and wound dressings but also soft robotics, drug delivery, actuators and catalysis. Ways to tailor hydrogel properties are crosslinking mechanism, hydrogel shape and reinforcement, but new features can be introduced by variation of hydrogel composition as well, e.g. via monomer choice, functionalization or compartmentalization. Especially, multicompartment hydrogels drive progress towards complex and highly functional soft materials. In the present review the latest developments in multicompartment hydrogels are highlighted with a focus on three types of compartments, i.e. micellar/vesicular, droplets or multi-layers including various sub-categories. Furthermore, several morphologies of compartmentalized hydrogels and applications of multicompartment hydrogels will be discussed as well. Finally, an outlook towards future developments of the field will be given. The further development of multicompartment hydrogels is highly relevant for a broad range of applications and will have a significant impact on biomedicine and organic devices. This article is protected by copyright. All rights reserved.
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Xiong F, Ma C, Zhu YR, Sun C, Chen L, Zhang YJ, Zhu YJ, Wang ZH. A highly stereoselective and recyclable microgel-supported bifunctional sulfonamide organocatalyst for asymmetric alcoholysis of meso-cyclic anhydrides: a thermo-responsive “organic nanoreactor”. NEW J CHEM 2022. [DOI: 10.1039/d2nj01914k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We developed a novel thermo-responsive microgel catalyst based on readily available (1S,2S)-2-amino-1-(p-nitrophenyl)propane-1,3-diol and applied it in the field of asymmetric alcoholysis of cyclic meso-anhydrides.
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Affiliation(s)
- Fei Xiong
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Chao Ma
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Yi-Ren Zhu
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Chen Sun
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Lu Chen
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Yan-Jun Zhang
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Yuan-Jie Zhu
- Department of Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China
| | - Zhong-Hua Wang
- School of Chemical and Environmental and Engineering, Shanghai Institute of Technology, Shanghai 201400, China
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9
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Nájera C, Foubelo F, Sansano JM, Yus M. Enantioselective desymmetrization reactions in asymmetric catalysis. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132629] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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10
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Tomer SO, Soni HP. Cinchona alkaloid derivative modified Fe 3O 4 nanoparticles for enantioselective ring opening of meso-cyclic anhydrides. NEW J CHEM 2022. [DOI: 10.1039/d1nj04081b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Making magnetic achiral surfaces chiral for asymmetric catalysis! Enantioselective meso-cyclic anhydride ring opening is demonstrated on the surface of modified-quinidine capped Fe3O4 nanoparticles.
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Affiliation(s)
- Sanjiv O. Tomer
- Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390 002, Gujarat, India
| | - Hemant P. Soni
- Department of Chemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara-390 002, Gujarat, India
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Eisold S, Hoppe Alvarez L, Ran K, Hengsbach R, Fink G, Centeno Benigno S, Mayer J, Wöll D, Simon U. DNA introduces an independent temperature responsiveness to thermosensitive microgels and enables switchable plasmon coupling as well as controlled uptake and release. NANOSCALE 2021; 13:2875-2882. [PMID: 33306082 DOI: 10.1039/d0nr05650b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
A novel DNA-microgel hybrid system with dual thermal responsiveness is introduced uitilizing covalent coupling of single stranded DNA (ssDNA) to thermoresponsive microgels (μGs). The spatial distribution of the coupling sites for the ssDNA was characterized with 3D superresolution fluorescence microscopy. The DNA-functionalized μGs remain thermoresponsive and can take up dye-labeled complementary ssDNA, which can be released again by overcoming the dehybridization temperature of the DNA independently of the volume phase transition (VPT) of the μGs. The same holds for nano-objects represented by plasmonic gold nanoparticles (AuNPs), the penetration depth of which was visualized via TEM tomography and 3D reconstruction and which show enhanced plasmonic coupling in the collapsed state of the μG and thus gets switchable. In contrast, if ssDNA was taken up just by non-specific interactions, i.e. into non-functionalized μGs, its release is temperature-independent and can only be induced by increasing the salt concentration. Thus, the incorporated ssDNA represents highly selectice binding sites determined by their base number and sequence, which makes the VPT, beeing determined by the μG composition, and the reversible uptake and release enabled through programmable DNA hybridization are independent features. The combination with the typically high biocompatibility and the retained swellability and permeability hold promise for new fundamental insights as well as for potential applications in biological environments.
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Affiliation(s)
- Sabine Eisold
- Institute of Inorganic Chemistry, RWTH Aachen University, 52074 Aachen, Germany.
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12
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Bell D, Ludwanowski S, Lüken A, Sarikaya B, Walther A, Wessling M. Hydrogel membranes made from crosslinked microgel multilayers with tunable density. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2020.118912] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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13
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Li J, Jia X, Yin L. Hydrogel: Diversity of Structures and Applications in Food Science. FOOD REVIEWS INTERNATIONAL 2021. [DOI: 10.1080/87559129.2020.1858313] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Jinlong Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Technology and Business University, Beijing, P.R. China
- Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology and Business University, Beijing, P.R. China
| | - Xin Jia
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, P.R. China
| | - Lijun Yin
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, P.R. China
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Xiong F, Xi CC, Ma C, Chen L, Sun MW, Zhang XG, Hong DF. Synthesis of Roche Lactone via the Enantioselective Alcoholysis of meso-Cyclic Anhydride Strategy: A Practical Approach Employing an Efficient and Reusable Organic Microgel Auxiliaries. HETEROCYCLES 2021. [DOI: 10.3987/com-20-14386] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Bochenek S, McNamee CE, Kappl M, Butt HJ, Richtering W. Interactions between a responsive microgel monolayer and a rigid colloid: from soft to hard interfaces. Phys Chem Chem Phys 2021; 23:16754-16766. [PMID: 34319323 DOI: 10.1039/d1cp01703a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Responsive poly-N-isopropylacrylamide-based microgels are commonly used as model colloids with soft repulsive interactions. It has been shown that the microgel-microgel interaction in solution can be easily adjusted by varying the environmental parameters, e.g., temperature, pH, or salt concentration. Furthermore, microgels readily adsorb to liquid-gas and liquid-liquid interfaces forming responsive foams and emulsions that can be broken on-demand. In this work, we explore the interactions between microgel monolayers at the air-water interface and a hard colloid in the water. Force-distance curves between the monolayer and a silica particle were measured with the Monolayer Particle Interaction Apparatus. The measurements were conducted at different temperatures and lateral compressions, i.e., different surface pressures. The force-distance approach curves display long-range repulsive forces below the volume phase transition temperature of the microgels. Temperature and lateral compression reduce the stiffness of the monolayer. The adhesion increases with temperature and decreases with a lateral compression of the monolayer. When compressed laterally, the interactions between the microgels are hardly affected by temperature, as the directly adsorbed microgel fractions are nearly insensitive to temperature. In contrast, our findings show that the temperature-dependent swelling of the microgel fractions in the aqueous phase strongly influences the interaction with the probe. This is explained by a change in the microgel monolayer from a soft to a hard repulsive interface.
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Affiliation(s)
- Steffen Bochenek
- Institute of Physical Chemistry, RWTH Aachen University, Landoltweg 2, 52074 Aachen, Germany
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17
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Schäfer D, Fink F, Kleinschmidt D, Keisers K, Thomas F, Hoffmann A, Pich A, Herres-Pawlis S. Enhanced catalytic activity of copper complexes in microgels for aerobic oxidation of benzyl alcohols. Chem Commun (Camb) 2020; 56:5601-5604. [PMID: 32355940 DOI: 10.1039/d0cc02433c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Catalytically active copper bis(pyrazolyl)methane complexes have been anchored into pVCL-GMA microgels on specified positions within the microgel network. Functionalized microgels act as nanoreactors providing a tailored environment and stabilization for the copper complexes thus increasing the product yield. The oxidation of benzyl alcohols to their respective aldehydes was chosen as a test reaction to show the enhancement of catalytic activity due to the immobilization of the copper complex compared to the copper salt and the molecular copper complex.
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Affiliation(s)
- Dominic Schäfer
- Chair of Bioinorganic Chemistry, Institute for Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Fabian Fink
- Chair of Bioinorganic Chemistry, Institute for Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Denise Kleinschmidt
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany. and Leibniz-Institute for Interactive Materials (DWI), Forckenbeckstraße 50, 52074 Aachen, Germany
| | - Kristina Keisers
- Chair of Bioinorganic Chemistry, Institute for Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Fabian Thomas
- Chair of Bioinorganic Chemistry, Institute for Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Alexander Hoffmann
- Chair of Bioinorganic Chemistry, Institute for Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
| | - Andrij Pich
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany. and Leibniz-Institute for Interactive Materials (DWI), Forckenbeckstraße 50, 52074 Aachen, Germany and Aachen Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Brightlands Chemelot Campus, Urmonderbaan 22, 6167 RD Geleen, The Netherlands
| | - Sonja Herres-Pawlis
- Chair of Bioinorganic Chemistry, Institute for Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen, Germany.
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Eelkema R, Pich A. Pros and Cons: Supramolecular or Macromolecular: What Is Best for Functional Hydrogels with Advanced Properties? ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1906012. [PMID: 31919957 DOI: 10.1002/adma.201906012] [Citation(s) in RCA: 57] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 10/28/2019] [Indexed: 06/10/2023]
Abstract
Hydrogels are fascinating soft materials with unique properties. Many biological systems are based on hydrogel-like structures, underlining their versatility and relevance. The properties of hydrogels strongly depend on the structure of the building blocks they are composed of, as well as the nature of interactions between them in the network structure. Herein, gel networks made by supramolecular interactions are compared to covalent macromolecular networks, drawing conclusions about their performance and application as responsive materials.
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Affiliation(s)
- Rienk Eelkema
- Department of Chemical Engineering, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Andrij Pich
- Institute of Technical and Macromolecular Chemistry, RWTH Aachen University, Worringerweg 2, 52074, Aachen, Germany
- DWI - Leibniz-Institute for Interactive Materials e.V., Forckenbeckstraße 50, 52056, Aachen, Germany
- Aachen Maastricht Institute for Biobased Materials (AMIBM), Maastricht University, Brightlands Chemelot Campus, Urmonderbaan 22, 6167 RD, Geleen, The Netherlands
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19
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Chen J, Ma X, Gnanasekar P, Qin D, Luo Q, Sun Z, Zhu J, Yan N. Synthesis of recoverable thermosensitive Fe 3O 4 hybrid microgels with controllable catalytic activity. NEW J CHEM 2020. [DOI: 10.1039/d0nj03558k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
High-efficiency recoverable catalytic magnetite microgel particles, comprising a magnetic Fe3O4 nanoparticle (NP) core with a thermo-sensitive poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) polymer shell, were synthesized through a four-step procedure.
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Affiliation(s)
- Jing Chen
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Zhejiang 315201
- P. R. China
| | - Xiaozhen Ma
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Zhejiang 315201
- P. R. China
| | | | - Dongdong Qin
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Zhejiang 315201
- P. R. China
| | - Qing Luo
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Zhejiang 315201
- P. R. China
| | - Zhong Sun
- College of Chemical Engineering
- Sci-Tech Center for Clean Conversion and High-Value Utilization of Biomass
- Northeast Electric Power University
- Jilin
- P. R. China
| | - Jin Zhu
- Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province
- Ningbo Institute of Materials Technology and Engineering
- Chinese Academy of Sciences
- Zhejiang 315201
- P. R. China
| | - Ning Yan
- Department of Chemical Engineering and Applied Chemistry
- University of Toronto
- Canada
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20
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Purohit A, Centeno SP, Wypysek SK, Richtering W, Wöll D. Microgel PAINT - nanoscopic polarity imaging of adaptive microgels without covalent labelling. Chem Sci 2019; 10:10336-10342. [PMID: 32110321 PMCID: PMC6984396 DOI: 10.1039/c9sc03373d] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 09/16/2019] [Indexed: 12/13/2022] Open
Abstract
Polymer nanostructures have enormous potential for various applications in materials and life sciences. In order to exploit and understand their full capabilities, a detailed analysis of their structures and the environmental conditions in them is essential on the nanoscopic scale. With a super-resolution fluorescence microscopy technique known as PAINT (Points Accumulation for Imaging in Nanoscale Topography), we imaged colloidal hydrogel networks, so-called microgels, having a hydrodynamic radius smaller than the diffraction limit, gaining unprecedented insight into their full 3D structure which is not accessible in this much detail with any other experimental method. In addition to imaging of the microgel structure, the use of Nile Red as the solvatochromic fluorophore allowed us to resolve the polarity conditions within the investigated microgels, thus providing nanoscopic information on the x,y,z-position of labels including their polarity without the need of covalent labelling. With this imaging approach, we give a detailed insight into adapting structural and polarity properties of temperature-responsive microgels when changing the temperature beyond the volume phase transition.
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Affiliation(s)
- Ashvini Purohit
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52074 Aachen , Germany .
| | - Silvia P Centeno
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52074 Aachen , Germany .
| | - Sarah K Wypysek
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52074 Aachen , Germany .
| | - Walter Richtering
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52074 Aachen , Germany .
| | - Dominik Wöll
- Institute of Physical Chemistry , RWTH Aachen University , Landoltweg 2 , 52074 Aachen , Germany .
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21
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Chimisso V, Fodor C, Meier W. Effect of Divalent Cation on Swelling Behavior of Anionic Microgels: Quantification and Dynamics of Ion Uptake and Release. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:13413-13420. [PMID: 31584278 DOI: 10.1021/acs.langmuir.9b02791] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Poly(N-vinylcaprolactam-co-itaconate) (P(VCL-co-IADME) microgels were synthesized varying the molar ratio between VCL and IADME via free radical precipitation polymerization in the presence of quaternary ammonium surfactant. In order to determine the effect of the divalent metal ions on the structure and the swelling behavior of the microgel systems, both neutral and charged forms of the hydrogels after hydrolysis were investigated. The triggered gel collapse caused by the divalent metal ion together with the quantification of the metal ion uptake was studied in detail by titration and ion chromatography methods and revealed the minimum concentration around 0.1 mM to trigger gel collapse on the treated gels. Uptake and release dynamics of the gels were followed by turbidity measurements and were in the time-range of 2 and 17 s, depending on the composition and the concentrations.
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Affiliation(s)
- Vittoria Chimisso
- University of Basel , Department of Chemistry , Mattenstrasse 24a , BPR1096, 4002 Basel , Basel-Stadt , Switzerland
| | - Csaba Fodor
- University of Basel , Department of Chemistry , Mattenstrasse 24a , BPR1096, 4002 Basel , Basel-Stadt , Switzerland
| | - Wolfgang Meier
- University of Basel , Department of Chemistry , Mattenstrasse 24a , BPR1096, 4002 Basel , Basel-Stadt , Switzerland
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22
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Meng J, Chang F, Su Y, Liu R, Cheng T, Liu G. Switchable Catalysts Used To Control Suzuki Cross-Coupling and Aza–Michael Addition/Asymmetric Transfer Hydrogenation Cascade Reactions. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01593] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Jingjing Meng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Fengwei Chang
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Yanchao Su
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Rui Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Tanyu Cheng
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
| | - Guohua Liu
- Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, Shanghai Normal University, Shanghai 200234, People’s Republic of China
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23
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Diastereoselective Opening of Bridged Anhydrides by Amidoximes Providing Access to 1,2,4-Oxadiazole/Norborna(e)ne Hybrids. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900843] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Tan KH, Xu W, Stefka S, Demco DE, Kharandiuk T, Ivasiv V, Nebesnyi R, Petrovskii VS, Potemkin II, Pich A. Selenium‐Modified Microgels as Bio‐Inspired Oxidation Catalysts. Angew Chem Int Ed Engl 2019; 58:9791-9796. [DOI: 10.1002/anie.201901161] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2019] [Revised: 03/17/2019] [Indexed: 01/02/2023]
Affiliation(s)
- Kok H. Tan
- DWI Leibniz Institute for Interactive Materials e.V.RWTH Aachen University Forckenbeckstraße 50 52074 Aachen Germany
| | - Wenjing Xu
- DWI Leibniz Institute for Interactive Materials e.V.RWTH Aachen University Forckenbeckstraße 50 52074 Aachen Germany
| | - Simon Stefka
- DWI Leibniz Institute for Interactive Materials e.V.RWTH Aachen University Forckenbeckstraße 50 52074 Aachen Germany
| | - Dan E. Demco
- DWI Leibniz Institute for Interactive Materials e.V.RWTH Aachen University Forckenbeckstraße 50 52074 Aachen Germany
- Technical University of Cluj-NapocaDepartment of Physics and Chemistry Romania
| | - Tetiana Kharandiuk
- Technology of Organic Products DepartmentLviv Polytechnic National University Ukraine
| | - Volodymyr Ivasiv
- Technology of Organic Products DepartmentLviv Polytechnic National University Ukraine
| | - Roman Nebesnyi
- Technology of Organic Products DepartmentLviv Polytechnic National University Ukraine
| | | | - Igor I. Potemkin
- DWI Leibniz Institute for Interactive Materials e.V.RWTH Aachen University Forckenbeckstraße 50 52074 Aachen Germany
- Physics DepartmentLomonosov Moscow State University Russian Federation
- National Research South Ural State University Chelyabinsk Russian Federation
| | - Andrij Pich
- DWI Leibniz Institute for Interactive Materials e.V.RWTH Aachen University Forckenbeckstraße 50 52074 Aachen Germany
- Aachen Maastricht Institute for Biobased Materials (AMIBM)Maastricht University Urmonderbaan 22 6167 RD Geleen The Netherlands
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25
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Tan KH, Xu W, Stefka S, Demco DE, Kharandiuk T, Ivasiv V, Nebesnyi R, Petrovskii VS, Potemkin II, Pich A. Selenmodifizierte Mikrogele als bioinspirierte Oxidationskatalysatoren. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901161] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kok H. Tan
- DWI Leibniz Institute für Interaktive Materialien e.V.RWTH Aachen Forckenbeckstraße 50 52074 Aachen Deutschland
| | - Wenjing Xu
- DWI Leibniz Institute für Interaktive Materialien e.V.RWTH Aachen Forckenbeckstraße 50 52074 Aachen Deutschland
| | - Simon Stefka
- DWI Leibniz Institute für Interaktive Materialien e.V.RWTH Aachen Forckenbeckstraße 50 52074 Aachen Deutschland
| | - Dan E. Demco
- DWI Leibniz Institute für Interaktive Materialien e.V.RWTH Aachen Forckenbeckstraße 50 52074 Aachen Deutschland
- Technical University of Cluj-NapocaDepartment of Physics and Chemistry Rumänien
| | - Tetiana Kharandiuk
- Technology of Organic Products DepartmentLviv Polytechnic National University Ukraine
| | - Volodymyr Ivasiv
- Technology of Organic Products DepartmentLviv Polytechnic National University Ukraine
| | - Roman Nebesnyi
- Technology of Organic Products DepartmentLviv Polytechnic National University Ukraine
| | | | - Igor I. Potemkin
- DWI Leibniz Institute für Interaktive Materialien e.V.RWTH Aachen Forckenbeckstraße 50 52074 Aachen Deutschland
- Physics DepartmentLomonosov Moscow State University Russische Förderation
- National Research South Ural State University Chelyabinsk Russische Förderation
| | - Andrij Pich
- DWI Leibniz Institute für Interaktive Materialien e.V.RWTH Aachen Forckenbeckstraße 50 52074 Aachen Deutschland
- Aachen Maastricht Institute for Biobased Materials (AMIBM)Maastricht University Urmonderbaan 22 6167 RD Geleen Niederlande
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26
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Zhou X, Chen F, Lu H, Kong L, Zhang S, Zhang W, Nie J, Du B, Wang X. Ionic Microgel Loaded with Gold Nanoparticles for the Synergistic Dual-Drug Delivery of Doxorubicin and Diclofenac Sodium. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b01904] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Xianjing Zhou
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Feng Chen
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Haipeng Lu
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Lingli Kong
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Siyu Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | - Wei Zhang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
| | | | | | - Xinping Wang
- Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China
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27
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Gumerov RA, Filippov SA, Richtering W, Pich A, Potemkin II. Amphiphilic microgels adsorbed at oil-water interfaces as mixers of two immiscible liquids. SOFT MATTER 2019; 15:3978-3986. [PMID: 31025694 DOI: 10.1039/c9sm00389d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Amphiphilic microgels adsorbed at an oil-water interface were studied by means of dissipative particle dynamics (DPD) simulations. The hydrophobic (A) and hydrophilic (B) monomer units in the polymer network are considered to be randomly distributed. Effects of the crosslinking density, interfacial tension between the liquids, their selectivity as solvents towards species A and B, and the degree of incompatibility between the A and B units on the internal microgel structure and distribution of the liquids are considered. The most important predictions are that (i) two immiscible liquids can homogeneously be mixed within the microgels and (ii) the adsorbed microgels contain a high fraction of the liquids (they are swollen at the interface). Simultaneous fulfillment of these two conditions can have a high impact on the design of new and efficient catalytic systems. In particular, such microgels can mix immiscible reactants dissolved in water and oil and trigger chemical reactions in the presence of a catalyst embedded into the microgel.
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Affiliation(s)
- Rustam A Gumerov
- Physics Department, Lomonosov Moscow State University, Moscow 119991, Russian Federation.
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28
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Abstract
Heterogeneous catalytic systems based on the use of stimuli-responsive materials can be switched from an “on” active state to an “off” inactive state, which contributes to endowing the catalysts with unique functional properties, such as adaptability, recyclability and precise spatial and temporal control on different types of chemical reactions. All these properties constitute a step toward the development of nature-inspired catalytic systems. Even if this is a niche area in the field of catalysis, it is possible to find in literature intriguing examples of dynamic catalysts, whose systematic analysis and review are still lacking. The aim of this work is to examine the recent developments of stimuli-responsive heterogeneous catalytic systems from the viewpoint of different approaches that have been proposed to obtain a dynamic control of catalytic efficiency. Because of the variety of reactions and conditions, it is difficult to make a quantitative comparison between the efficiencies of the considered systems, but the analysis of the different strategies can inspire the preparation of new smart catalytic systems.
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