1
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Giuri D, Marshall LJ, Wilson C, Seddon A, Adams DJ. Understanding gel-to-crystal transitions in supramolecular gels. SOFT MATTER 2021; 17:7221-7226. [PMID: 34286796 DOI: 10.1039/d1sm00770j] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Most supramolecular gels are stable or assumed to be stable over time, and aging effects are often not studied. However, some gels do show clear changes on aging, and a small number of systems exhibit gel-to-crystal transitions. In these cases, crystals form over time, typically at the expense of the network underpinning the gel; this leads to the gel falling apart. These systems are rare, and little is known about how these gel-to-crystal transitions occur. Here, we use a range of techniques to understand in detail a gel-to-crystal transition for a specific functionalised dipeptide based gelator. We show that the gel-to-crystal transition depends on the final pH of the medium which we control by varying the amount of glucon-δ-lactone (GdL) added. In the gel phase, at low concentrations of GdL, and at early time points with high concentrations of GdL, we are able to show the nanometre scale dimensions of the self-assembled fibre using SAXS; however there is no evidence of molecular ordering of the gel fibres in the WAXS. At low concentrations of GdL, these self-assembled fibres stiffen with time but do not crystallise over the timescale of the SAXS experiment. At high concentrations of GdL, the fibres are already stiffened, and then, as the pH drops further, give way to the presence of crystals which appear to grow preferentially along the direction of the fibre axis. We definitively show therefore that the gel and crystal phase are not the same. Our work shows that many assumptions in the literature are incorrect. Finally, we also show that the sample holder geometry is an important parameter for these experiments, with the rate of crystallisation depending on the holder in which the experiment is carried out.
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Affiliation(s)
- Demetra Giuri
- Dipartimento di Chimica Giacomo Ciamician, Alma Mater Studiorum, Università di Bologna, Via Selmi, 2, 40126, Bologna, Italy
| | - Libby J Marshall
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Claire Wilson
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Annela Seddon
- School of Physics, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK. and Bristol Centre for Functional Nanomaterials, HH Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol, BS8 1TL, UK
| | - Dave J Adams
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
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2
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Van Lommel R, De Borggraeve WM, De Proft F, Alonso M. Computational Tools to Rationalize and Predict the Self-Assembly Behavior of Supramolecular Gels. Gels 2021; 7:87. [PMID: 34287290 PMCID: PMC8293097 DOI: 10.3390/gels7030087] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2021] [Revised: 07/05/2021] [Accepted: 07/06/2021] [Indexed: 12/12/2022] Open
Abstract
Supramolecular gels form a class of soft materials that has been heavily explored by the chemical community in the past 20 years. While a multitude of experimental techniques has demonstrated its usefulness when characterizing these materials, the potential value of computational techniques has received much less attention. This review aims to provide a complete overview of studies that employ computational tools to obtain a better fundamental understanding of the self-assembly behavior of supramolecular gels or to accelerate their development by means of prediction. As such, we hope to stimulate researchers to consider using computational tools when investigating these intriguing materials. In the concluding remarks, we address future challenges faced by the field and formulate our vision on how computational methods could help overcoming them.
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Affiliation(s)
- Ruben Van Lommel
- Molecular Design and Synthesis, Department of Chemistry, KU Leuven, Celestijnenlaan 200F Leuven Chem & Tech, P.O. Box 2404, 3001 Leuven, Belgium;
- Eenheid Algemene Chemie (ALGC), Department of Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium;
| | - Wim M. De Borggraeve
- Molecular Design and Synthesis, Department of Chemistry, KU Leuven, Celestijnenlaan 200F Leuven Chem & Tech, P.O. Box 2404, 3001 Leuven, Belgium;
| | - Frank De Proft
- Eenheid Algemene Chemie (ALGC), Department of Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium;
| | - Mercedes Alonso
- Eenheid Algemene Chemie (ALGC), Department of Chemistry, Vrije Universiteit Brussel (VUB), Pleinlaan 2, 1050 Brussels, Belgium;
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3
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Panja S, Adams DJ. Stimuli responsive dynamic transformations in supramolecular gels. Chem Soc Rev 2021; 50:5165-5200. [PMID: 33646219 DOI: 10.1039/d0cs01166e] [Citation(s) in RCA: 162] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Supramolecular gels are formed by the self-assembly of small molecules under the influence of various non-covalent interactions. As the interactions are individually weak and reversible, it is possible to perturb the gels easily, which in turn enables fine tuning of their properties. Synthetic supramolecular gels are kinetically trapped and usually do not show time variable changes in material properties after formation. However, such materials potentially become switchable when exposed to external stimuli like temperature, pH, light, enzyme, redox, and chemical analytes resulting in reconfiguration of gel matrix into a different type of network. Such transformations allow gel-to-gel transitions while the changes in the molecular aggregation result in alteration of physical and chemical properties of the gel with time. Here, we discuss various methods that have been used to achieve gel-to-gel transitions by modifying a pre-formed gel material through external perturbation. We also describe methods that allow time-dependent autonomous switching of gels into different networks enabling synthesis of next generation functional materials. Dynamic modification of gels allows construction of an array of supramolecular gels with various properties from a single material which eventually extend the limit of applications of the gels. In some cases, gel-to-gel transitions lead to materials that cannot be accessed directly. Finally, we point out the necessity and possibility of further exploration of the field.
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Affiliation(s)
- Santanu Panja
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Dave J Adams
- School of Chemistry, University of Glasgow, Glasgow, G12 8QQ, UK.
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4
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Li Q, Zhang G, Wu Y, Wang Y, Liang Y, Yang X, Qi W, Su R, He Z. Control of peptide hydrogel formation and stability via heating treatment. J Colloid Interface Sci 2021; 583:234-242. [PMID: 33002695 DOI: 10.1016/j.jcis.2020.09.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 10/23/2022]
Abstract
Heating treatment is widely used in the preparation of metallic materials with controlled phase behavior and mechanical properties. However, for the soft materials assembled by short peptides, especially simple dipeptides, the detailed influences of heating treatment on the structures and functions of the materials remain largely unexplored. Here we showed that by thermal annealing or quenching of aromatic peptide solutions under kinetic control, we are able to control the self-assembly of peptide into materials with distinct phase behavior and macroscopic properties. The thermal annealing of the heated peptide solutions will lead to the formation of large nanobelts or bundles in solution, and no gels will be formed. However, by quenching the heated peptide solution, a self-supporting hydrogel will be formed quickly. Structure analysis revealed that the peptides preferred to self-assembled into much thinner and flexible nanohelices during quenching treatment. Moreover, the stability of the gels further increased with the repeated heating and quenching cycling of the peptide solutions. The results demonstrated that the heat treatment can be used to control the structure and function of self-assembled materials in a way similar to that of the conventional metallic or alloy materials.
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Affiliation(s)
- Qing Li
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Gong Zhang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Yifei Wu
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Yuefei Wang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China.
| | - Yaoyu Liang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Xin Yang
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
| | - Wei Qi
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
| | - Rongxin Su
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China; Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China; Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin 300072, PR China
| | - Zhimin He
- State Key Laboratory of Chemical Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, PR China
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5
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Singh P, Misra S, Sepay N, Mondal S, Ray D, Aswal VK, Nanda J. Self-assembling behaviour of a modified aromatic amino acid in competitive medium. SOFT MATTER 2020; 16:6599-6607. [PMID: 32608458 DOI: 10.1039/d0sm00584c] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Aromatic amino acid, specifically phenylalanine (Phe), is one of the most studied building blocks in peptide synthesis due to its importance in biology. It is reported in the literature that Phe-containing peptides have a high tendency to form different self-assembled materials due to efficient aromatic-aromatic interactions. In this article, we have tuned the supramolecular interactions of phenylalanine by making it electron-deficient upon introduction of the nitro group in the ring. The presence of the nitro group has a profound influence on the self-assembly process. It has been observed that 4-nitrophenylalanine (4NP) is a highly efficient gelator compared with the native phenylalanine in DMSO solvent in terms of minimum gelation concentration and it forms hydrogen bonding mediated crystals in water. The change of self-assembling patterns of 4NP in these solvents was studied using X-ray diffraction, UV-Vis spectroscopy, FE-SEM and other techniques. With the help of different experimental data and density functional theory (DFT), we have simulated the theoretical structure of 4NP in DMSO. The theoretical structure of 4NP in DMSO is different compared with that of crystals in water. We then studied the self-assembly process of 4NP in the mixed solvent of DMSO (polar aprotic) and water (polar protic). Different competitive non-covalent interactions of solvents as well as the ratio of the solvent mixture guide the final self-assembly state of 4NP.
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Affiliation(s)
- Pijush Singh
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, P.O. Botanic Garden, Howrah-711103, West Bengal, India.
| | - Souvik Misra
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, P.O. Botanic Garden, Howrah-711103, West Bengal, India.
| | - Nayim Sepay
- Department of Chemistry, Jadavpur University, Jadavpur, Kolkata-700032, India
| | - Sanjoy Mondal
- Polymer Science Unit, Indian association for the Cultivation of Science, Jadavpur, Kolkata-700032, India
| | - Debes Ray
- Solid State Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
| | - Vinod K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre Trombay, Mumbai, 400085, India
| | - Jayanta Nanda
- Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, P.O. Botanic Garden, Howrah-711103, West Bengal, India.
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6
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Panja S, Fuentes-Caparrós AM, Cross ER, Cavalcanti L, Adams DJ. Annealing Supramolecular Gels by a Reaction Relay. CHEMISTRY OF MATERIALS : A PUBLICATION OF THE AMERICAN CHEMICAL SOCIETY 2020; 32:5264-5271. [PMID: 32595268 PMCID: PMC7315816 DOI: 10.1021/acs.chemmater.0c01483] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 05/22/2020] [Indexed: 05/09/2023]
Abstract
Supramolecular gels have potential in many areas. In many cases, a major drawback is that the gels are formed at a high rate. As a result, nonoptimal, kinetically trapped self-assembled structures are often formed, leading to gels that can be hard to reproduce and control. One method to get around kinetic trapping is annealing. Thermal annealing is one possibility, but it is not always desirable to heat the gels. Here, we describe a method to anneal pH-triggered gels after they are formed. We employ a reaction relay in a peptide-based hydrogel system to anneal the structures by a controlled and uniform pH change. Our method allows us to prepare gels with more controlled properties. We show that this can be used to enable homogeneous "molding and casting" of the hydrogels. This method of annealing is more effective in improving gel robustness than a conventional heat-cool cycle.
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Affiliation(s)
- Santanu Panja
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
| | | | - Emily R. Cross
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
| | - Leide Cavalcanti
- ISIS
Pulsed Neutron Source, Rutherford Appleton
Laboratory, Didcot OX11 0QX, U.K.
| | - Dave J. Adams
- School
of Chemistry, University of Glasgow, Glasgow G12 8QQ, U.K.
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7
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Abraham BL, Liyanage W, Nilsson BL. Strategy to Identify Improved N-Terminal Modifications for Supramolecular Phenylalanine-Derived Hydrogelators. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14939-14948. [PMID: 31664849 PMCID: PMC7318788 DOI: 10.1021/acs.langmuir.9b02971] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Supramolecular hydrogels formed by self-assembly of low molecular weight (LMW) compounds have been identified as promising materials for applications in tissue engineering and regenerative medicine. In many cases, the relationship between the chemical structure of the gelator and the emergent hydrogel properties is poorly understood. As a result, empirical screening strategies instead of rational design approaches are often relied upon to tune the emergent properties of the gels. Herein, we describe a novel strategy to identify improved phenylalanine (Phe) derived gelators using a focused empirical approach. Fluorenylmethoxycarbonyl (Fmoc) protected Phe derivatives are a privileged class of gelators that spontaneously self-assemble into fibrils that entangle to form a hydrogel network upon dissolution into water. However, the Fmoc group has been shown to have toxicity drawbacks for potential biological applications, requiring the identification of new N-terminal modifications that promote efficient self-assembly but lack the shortcomings of the Fmoc group. We previously discovered that fibrils in Fmoc-p-nitrophenylalanine (Fmoc-4-NO2-Phe) hydrogels transition to crystalline microtubes after several hours by a mechanism that involves the hierarchical assembly and fusion of the hydrogel fibrils. We hypothesized that this hierarchical crystallization behavior could form the basis of a screening approach to identify alternative N-terminal functional groups to replace Fmoc in Phe-derived LMW gelators. Specifically, screening N-terminal modifying groups for 4-NO2-Phe that stabilize the hydrogel state by preventing subsequent hierarchical crystallization would facilitate empirical identification of functional Fmoc replacements. To test this approach, we screened a small series of 4-NO2-Phe derivatives with various N-terminal modifying groups to determine if any provided stable LMW supramolecular hydrogels. All but one of the 4-NO2-Phe derivatives assembled into crystalline forms. Only the 1-naphthaleneacetic acid (1-Nap) 4-NO2-Phe derivative self-assembled into a stable hydrogel network. Additional Phe derivatives were modified by N-terminal 1-Nap groups to confirm the general potential of 1-Nap as a suitable replacement for Fmoc, and all derivatives formed stable hydrogels under similar conditions to their Fmoc-Phe counterparts. These results illustrate the potential of this approach to identify next-generation Phe-derived LMW gelators with improved emergent properties.
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Affiliation(s)
- Brittany L Abraham
- Department of Chemistry , University of Rochester , Rochester , New York 14627-0216 , United States
| | - Wathsala Liyanage
- Department of Chemistry , University of Rochester , Rochester , New York 14627-0216 , United States
| | - Bradley L Nilsson
- Department of Chemistry , University of Rochester , Rochester , New York 14627-0216 , United States
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8
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Guterman T, Levin M, Kolusheva S, Levy D, Noor N, Roichman Y, Gazit E. Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition. Angew Chem Int Ed Engl 2019; 58:15869-15875. [DOI: 10.1002/anie.201907971] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 08/26/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Tom Guterman
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
| | - Maayan Levin
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
| | - Sofiya Kolusheva
- Ilse Katz Institute for Nanotechnology Ben Gurion University of the Negev Beer Sheva 84105 Israel
| | - Davide Levy
- Wolfson Applied Materials Research Center Tel Aviv University Tel Aviv 6997801 Israel
| | - Nadav Noor
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
| | - Yael Roichman
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
- Raymond and Beverly Sackler School of Physics & Astronomy Tel Aviv University Tel Aviv 6997801 Israel
| | - Ehud Gazit
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
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9
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Guterman T, Levin M, Kolusheva S, Levy D, Noor N, Roichman Y, Gazit E. Real‐Time In‐Situ Monitoring of a Tunable Pentapeptide Gel–Crystal Transition. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907971] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Tom Guterman
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
| | - Maayan Levin
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
| | - Sofiya Kolusheva
- Ilse Katz Institute for Nanotechnology Ben Gurion University of the Negev Beer Sheva 84105 Israel
| | - Davide Levy
- Wolfson Applied Materials Research Center Tel Aviv University Tel Aviv 6997801 Israel
| | - Nadav Noor
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
| | - Yael Roichman
- Raymond and Beverly Sackler School of Chemistry Tel Aviv University Tel Aviv 6997801 Israel
- Raymond and Beverly Sackler School of Physics & Astronomy Tel Aviv University Tel Aviv 6997801 Israel
| | - Ehud Gazit
- Department of Molecular Microbiology and Biotechnology George S. Wise Faculty of Life Sciences Tel Aviv University Tel Aviv 6997801 Israel
- Department of Materials Science and Engineering Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Tel Aviv 6997801 Israel
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10
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Fuentes-Caparrós AM, de Paula Gómez-Franco F, Dietrich B, Wilson C, Brasnett C, Seddon A, Adams DJ. Annealing multicomponent supramolecular gels. NANOSCALE 2019; 11:3275-3280. [PMID: 30720823 DOI: 10.1039/c8nr09423c] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Annealing is widely used as a means of changing the physical properties of a material. The rate of heating and cooling used in the annealing process controls the final properties. Annealing can be used as a means of driving towards the, or at least a, thermodynamic minimum. There is surprisingly little information on annealing kinetically-trapped supramolecular gels. Here, we show that annealing multicomponent gels can be used to prepare materials with tunable mechanical properties. We show that annealing in a two-component gel leads to a self-sorted network, which has significantly different mechanical properties to the as-prepared gels. Whilst the fibres are self-sorted, we show that the annealing of this system leads to significant change in the network level of assembly, and it is this that leads to the increase in storage modulus. We also show that it is possible to selectively anneal only a single component in the mixture.
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11
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Duy LN, Sekiya R, Tosaka M, Yamago S, Matsumoto T, Nishino T, Ichikawa T, Haino T. Organogelators of 5,17-Difunctionalized Calix[4]arenes. CHEM LETT 2019. [DOI: 10.1246/cl.180819] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lai Nang Duy
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Ryo Sekiya
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
| | - Masatoshi Tosaka
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Shigeru Yamago
- Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan
| | - Takuya Matsumoto
- Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe, Hyogo 657-8501, Japan
| | - Takashi Nishino
- Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe, Hyogo 657-8501, Japan
| | - Takayuki Ichikawa
- Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8527, Japan
| | - Takeharu Haino
- Department of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima, Hiroshima 739-8526, Japan
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12
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Mulvee M, Vasiljevic N, Mann S, Patil AJ. Construction of supramolecular hydrogels using photo-generated nitric oxide radicals. SOFT MATTER 2018; 14:5950-5954. [PMID: 30010173 DOI: 10.1039/c8sm00651b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photo-generated nitric oxide radicals (NO˙) derived from sodium nitroprusside dihydrate (SNP) are employed for the construction of supramolecular hydrogels based on an amino acid derivative precursor, N-fluorenylmethyloxycarbonyl tyrosine phosphate (FYP), which through dephosphorylation produces the gelator, N-fluorenylmethyloxycarbonyl tyrosine (FY). Self-assembly of the amphiphilic gelator yields high-aspect ratio nanofilaments that entangle to form self-supporting, viscoelastic hydrogels. The presence of photolyzed SNP yields periodically twisted nanofilaments with opposite chirality to filaments formed through conventional hydrogelation routes.
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Affiliation(s)
- Matthew Mulvee
- Centre for Organized Matter Chemistry and Centre for Protocell Research, School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK.
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13
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Russo M, Lo Meo P. Binding abilities of a chiral calix[4]resorcinarene: a polarimetric investigation on a complex case of study. Beilstein J Org Chem 2018; 13:2698-2709. [PMID: 29564007 PMCID: PMC5753176 DOI: 10.3762/bjoc.13.268] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 11/30/2017] [Indexed: 11/23/2022] Open
Abstract
Polarimetry was used to investigate the binding abilities of a chiral calix[4]resorcinarene derivative, bearing L-proline subunits, towards a set of suitably selected organic guests. The simultaneous formation of 1:1 and 2:1 host–guest inclusion complexes was observed in several cases, depending on both the charge status of the host and the structure of the guest. Thus, the use of the polarimetric method was thoroughly revisited, in order to keep into account the occurrence of multiple equilibria. Our data indicate that the stability of the host–guest complexes is affected by an interplay between Coulomb interactions, π–π interactions, desolvation effects and entropy-unfavorable conformational dynamic restraints. Polarimetry is confirmed as a very useful and versatile tool for the investigation of supramolecular interactions with chiral hosts, even in complex systems involving multiple equilibria.
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Affiliation(s)
- Marco Russo
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), University of Palermo, V.le delle Scienze ed. 17, 90128 Palermo, Italy
| | - Paolo Lo Meo
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), University of Palermo, V.le delle Scienze ed. 17, 90128 Palermo, Italy.,ATeNCenter, University of Palermo, V.le delle Scienze ed. 18, 90128 Palermo, Italy
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14
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Feng H, Du Y, Tang F, Ji N, Zhao X, Zhao H, Chen Q. Silver ions blocking crystallization of guanosine-based hydrogel for potential antimicrobial applications. RSC Adv 2018; 8:15842-15852. [PMID: 35539473 PMCID: PMC9080096 DOI: 10.1039/c8ra02500b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 04/23/2018] [Indexed: 02/05/2023] Open
Abstract
In this work, the detailed crystallization process of 2′-deoxy-2′-fluoroguanosine (FGd) hydrogel has been studied using single crystal X-ray diffraction, variable-temperature nuclear magnetic resonance (VT-NMR), and scanning electron microscopy (SEM). Both solid and solution results indicated that the K+-mediated G-quartet structures were unstable and easily resulted in the breakdown of the hydrogel to form linear ribbon structures by forming mimic reverse Watson–Crick base pairs between the two faces with an intermolecular hydrogen-bond (N10H–O11). Accordingly, Ag+ was introduced to block the crystallization of FGd to form long lifetime stable supramolecular hydrogel (>6 months) and possible silver-ions-mediated base pair motifs were suggested via NMR, UV, and mass spectroscopy (MS) in combination with powder X-ray diffraction (PXRD) and circular dichroism spectroscopy (CD). Furthermore, FGdAg hydrogel exhibited low toxicity for normal oral keratinocyte cells (NOK-SI) and good antibacterial activities for Fusobacterium nucleatum in vitro. Ag+ was introduced to block the crystallization of FGd forming long lifetime stability supramolecular hydrogel (>6 months), which displayed low toxicity for NOK-SI cell and good antibacterial activities.![]()
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Affiliation(s)
- Hui Feng
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
| | - Yuqi Du
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
| | - Fan Tang
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
| | - Ning Ji
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
| | - Xuefeng Zhao
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
| | - Hang Zhao
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
| | - Qianming Chen
- State Key Laboratory of Oral Diseases
- West China Hospital of Stomatology
- Sichuan University
- Chengdu
- P. R. China
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15
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Ma X, Cui Y, Liu S, Wu J. A thermo-responsive supramolecular gel and its luminescence enhancement induced by rare earth Y 3. SOFT MATTER 2017; 13:8027-8030. [PMID: 29104972 DOI: 10.1039/c7sm01726j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A new acylhydrazone-functionalized dual benzimidazole derivative gelator (L) was synthesized. L can self-assemble in DMSO-EG (ethylene glycol) or DMF-water mixtures to form a thermo-responsive supramolecular organogel (L-gel). In order to increase the fluorescence intensity of L-gel (DMSO-EG system), L-gel slowly turned into a clear solution upon addition of one equivalent of RE (rare earth) Y3+. Interestingly, this gelator L and Y3+ can be assembled into an enhanced blue-light-emitting supramolecular metallogel (Y@gel) in DMF-water mixtures.
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Affiliation(s)
- Xinxian Ma
- School of Chemistry and Chemical Engineering, Ningxia Normal University, Guyuan 756000, People's Republic of China.
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16
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17
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Rajdev P, Chakraborty S, Schmutz M, Mesini P, Ghosh S. Supramolecularly Engineered π-Amphiphile. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:4789-4795. [PMID: 28423895 DOI: 10.1021/acs.langmuir.7b00842] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
This article describes self-assembly of supramolecularly engineered naphthalene-diimide (NDI)-derived amphiphiles NDI-1 and NDI-2. They have the same hydrophobic/hydrophilic balance but merely differ by a single functional group, amide or ester. They exhibit distinct self-assembly in water; NDI-1 forms hydrogel, which upon aging forms crystals, whereas NDI-2 forms micelles as revealed by in-depth structural analysis using cryo-TEM, dynamic light scattering, and small-angle X-ray scattering studies. These results suggest that the H-bonding among the amide groups fully regulates the self-assembly by overruling the packing parameters. Further, the present study elucidates sharp lower critical solution temperature exhibited by these π-amphiphiles, which has been extensively studied for many important applications of water-soluble polymers but hardly known in the literature of small-molecule surfactants. Control experiments with the same water-soluble hydrophilic wedge did not show such a property, confirming this to be a consequence of the supramolecular polymerization by extended amide-amide H-bonding and not inherent to the structure of the hydrophilic wedge containing oligo-oxyethylene chains.
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Affiliation(s)
- Priya Rajdev
- Polymer Science Unit, Indian Association for the Cultivation of Science , Kolkata 700032, India
| | - Saptarshi Chakraborty
- Polymer Science Unit, Indian Association for the Cultivation of Science , Kolkata 700032, India
| | - Marc Schmutz
- Université de Strasbourg, CNRS , Institut Charles Sadron, 23 rue du Loess-BP 84047, 67034 Strasbourg Cedex 2, France
| | - Philippe Mesini
- Université de Strasbourg, CNRS , Institut Charles Sadron, 23 rue du Loess-BP 84047, 67034 Strasbourg Cedex 2, France
| | - Suhrit Ghosh
- Polymer Science Unit, Indian Association for the Cultivation of Science , Kolkata 700032, India
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18
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Arnedo-Sánchez L, Nonappa N, Bhowmik S, Hietala S, Puttreddy R, Lahtinen M, De Cola L, Rissanen K. Rapid self-healing and anion selectivity in metallosupramolecular gels assisted by fluorine–fluorine interactions. Dalton Trans 2017; 46:7309-7316. [DOI: 10.1039/c7dt00983f] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Metal complexes from perfluoroalkylamide terpyridine self-assemble into anion selective gels, which manifest self-healing and thermal rearrangement in aqueous dimethyl sulfoxide.
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Affiliation(s)
| | - Nonappa Nonappa
- Molecular Materials Group
- Department of Applied Physics
- Aalto University School of Science
- Espoo
- Finland
| | - Sandip Bhowmik
- University of Jyvaskyla
- Department of Chemistry
- Nanoscience Center
- Jyväskylä
- Finland
| | - Sami Hietala
- Department of Chemistry
- University of Helsinki
- Helsinki
- Finland
| | - Rakesh Puttreddy
- University of Jyvaskyla
- Department of Chemistry
- Nanoscience Center
- Jyväskylä
- Finland
| | - Manu Lahtinen
- University of Jyvaskyla
- Department of Chemistry
- Nanoscience Center
- Jyväskylä
- Finland
| | - Luisa De Cola
- ISIS
- Université de Strasbourg and CNRS UMR 7006
- Strasbourg 67000
- France
| | - Kari Rissanen
- University of Jyvaskyla
- Department of Chemistry
- Nanoscience Center
- Jyväskylä
- Finland
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