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Wei Z, Price A, Wei K, Luo Q, Thanneeru S, Sun S, He J. Polymer N-Heterocyclic Carbene (NHC) Ligands for Silver Nanoparticles. ACS Appl Mater Interfaces 2022; 14:55227-55237. [PMID: 36459050 DOI: 10.1021/acsami.2c17706] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Polymer N-heterocyclic carbenes (NHCs) are a class of robust surface ligands to provide superior colloidal stability for metal nanoparticles (NPs) under various harsh conditions. We report a general method to prepare polymeric NHCs and demonstrate that these polymer NHC-AgNPs are stable against oxidative etching and show high peroxidase activity. We prepared three imidazolium-terminated poly(methyl methacrylate) (PMMA), polystyrene (PS), and poly(2-(2-methoxyethoxy)ethyl methacrylate) (PMEO2MA) through atom-transfer radical polymerization with an imidazole-containing initiator. The imidazolium end group was further converted to NHC-Ag(I) in the presence of Ag2O at room temperature. Polymer NHC-Ag(I) can transmetalate to AgNPs through ligand exchange at the interface of oil/water within 2 min. All the three polymers can modify metal NPs, such as AgNPs, Ag nanowires, and AuNPs, providing excellent thermal, oxidative, and chemical stabilities for AgNPs. As an example, in the presence of hydrogen peroxide, AgNPs modified by polymer NHCs were resistant against oxidative etching with a rate of ∼700 times slower than those grafted with thiolates. AgNPs modified by polymer NHCs also showed higher peroxidase activity, 4 times more active than those capped by citrate and polyvinylpyrrolidone (PVP) and 2 times more active than those with polymer thiolate. Our studies demonstrate a great potential of using polymer NHCs to stabilize metallic NPs for various applications.
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Affiliation(s)
- Zichao Wei
- Department of Chemistry, University of Connecticut, Storrs, Connecticut06269, United States
| | - Aleisha Price
- Department of Chemistry, University of Connecticut, Storrs, Connecticut06269, United States
| | - Kecheng Wei
- Department of Chemistry, Brown University, Providence, Rhode Island02912, United States
| | - Qiang Luo
- Department of Chemistry, University of Connecticut, Storrs, Connecticut06269, United States
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, Connecticut06269, United States
| | - Shouheng Sun
- Department of Chemistry, Brown University, Providence, Rhode Island02912, United States
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, Connecticut06269, United States
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut06269, United States
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2
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Jin L, Thanneeru S, Cintron D, He J. Bioinspired Design of Hybrid Polymer Catalysts with Multicopper Sites for Oxygen Reduction. ChemCatChem 2020. [DOI: 10.1002/cctc.202001333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lei Jin
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | | | - Daniel Cintron
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Jie He
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
- Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269 USA
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3
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Wei Z, Thanneeru S, Margaret Rodriguez E, Weng G, He J. Adaptable Eu-containing polymeric films with dynamic control of mechanical properties in response to moisture. Soft Matter 2020; 16:2276-2284. [PMID: 32040125 DOI: 10.1039/c9sm02440a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Self-healing polymers often have a trade-off between healing efficiency and mechanical stiffness. Stiff polymers that sacrifice their chain mobility are slow to repair upon mechanical failure. We herein report adaptable polymer films with dynamically moisture-controlled mechanical and optical properties, therefore having tunable self-healing efficiency. The design of the polymer film is based on the coordination of europium (Eu) with dipicolylamine (DPA)-containing random copolymers of poly(n-butyl acrylate-co-2-hydroxy-3-dipicolylamino methacrylate) (P(nBA-co-GMADPA)). The Eu-DPA complexation results in the formation of mechanically robust polymer films. The coordination of Eu-DPA has proven to be moisture-switchable given the preferential coordination of lanthanide metals to O over N, using nuclear magnetic resonance and fluorescence spectroscopy. Water competing with DPA to bind Eu3+ ions can weaken the cross-linking networks formed by Eu-DPA coordination, leading to the increase of chain mobility. The in situ dynamic mechanical analysis and ex situ rheological studies confirm that the viscofluid and the elastic solid states of Eu-polymers are switchable by moisture. Water speeds up the self-healing of the polymer film by roughly 100 times; while it can be removed after healing to recover the original mechanical stiffness of polymers.
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Affiliation(s)
- Zichao Wei
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA.
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA.
| | | | - Gengsheng Weng
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA. and School of Material Science and Chemical Engineering, Ningbo Key Laboratory of Specialty Polymers, Ningbo University, Ningbo 315211, China.
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, USA. and Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, USA
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4
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Zhang L, Wei Z, Thanneeru S, Meng M, Kruzyk M, Ung G, Liu B, He J. Frontispiece: A Polymer Solution To Prevent Nanoclustering and Improve the Selectivity of Metal Nanoparticles for Electrocatalytic CO
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Reduction. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/anie.201984462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lei Zhang
- Jiangsu Key Laboratory of New Power Batteries Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Zichao Wei
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | | | - Michael Meng
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Megan Kruzyk
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Gaël Ung
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Ben Liu
- Jiangsu Key Laboratory of New Power Batteries Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China
| | - Jie He
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
- Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269 USA
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5
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Zhang L, Wei Z, Thanneeru S, Meng M, Kruzyk M, Ung G, Liu B, He J. A Polymer Solution To Prevent Nanoclustering and Improve the Selectivity of Metal Nanoparticles for Electrocatalytic CO
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Reduction. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201909069] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lei Zhang
- Jiangsu Key Laboratory of New Power Batteries Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Zichao Wei
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | | | - Michael Meng
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Megan Kruzyk
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Gaël Ung
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
| | - Ben Liu
- Jiangsu Key Laboratory of New Power Batteries Collaborative Innovation Center of Biomedical Functional Materials School of Chemistry and Materials Science Nanjing Normal University Nanjing 210023 China
| | - Jie He
- Department of Chemistry University of Connecticut Storrs CT 06269 USA
- Polymer Program Institute of Materials Science University of Connecticut Storrs CT 06269 USA
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Zhang L, Wei Z, Thanneeru S, Meng M, Kruzyk M, Ung G, Liu B, He J. A Polymer Solution To Prevent Nanoclustering and Improve the Selectivity of Metal Nanoparticles for Electrocatalytic CO 2 Reduction. Angew Chem Int Ed Engl 2019; 58:15834-15840. [PMID: 31468668 DOI: 10.1002/anie.201909069] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Indexed: 01/26/2023]
Abstract
The stability of metal nanocatalysts for electrocatalytic CO2 reduction is of key importance for practical application. We report the use of two polymeric N-heterocyclic carbenes (NHC) (polydentate and monodentate) to stabilize metal nanocatalysts (Au and Pd) for efficient CO2 electroreduction. Compared with other conventional ligands including thiols and amines, metal-carbene bonds that are stable under reductive potentials prevent the nanoclustering of nanoparticles. Au nanocatalysts modified by polymeric NHC ligands show an activity retention of 86 % after CO2 reduction at -0.9 V for 11 h, while it is less than 10 % for unmodified Au. We demonstrate that the hydrophobicity of polymer ligands and the enriched surface electron density of metal NPs through σ-donation of NHCs substantially improve the selectivity for CO2 reduction over proton.
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Affiliation(s)
- Lei Zhang
- Jiangsu Key Laboratory of New Power Batteries, Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China.,Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Zichao Wei
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Michael Meng
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Megan Kruzyk
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Gaël Ung
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Ben Liu
- Jiangsu Key Laboratory of New Power Batteries, Collaborative Innovation Center of Biomedical Functional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing, 210023, China
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA.,Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
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7
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Thanneeru S, Milazzo N, Lopes A, Wei Z, Angeles-Boza AM, He J. Synthetic Polymers To Promote Cooperative Cu Activity for O2 Activation: Poly vs Mono. J Am Chem Soc 2019; 141:4252-4256. [DOI: 10.1021/jacs.9b01093] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Thanneeru S, Li W, He J. Controllable Self-Assembly of Amphiphilic Tadpole-Shaped Polymer Single-Chain Nanoparticles Prepared through Intrachain Photo-cross-linking. Langmuir 2019; 35:2619-2629. [PMID: 30673287 DOI: 10.1021/acs.langmuir.8b03095] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
We report the use of intramolecular cross-linking chemistry as a tool to control the self-assembly of amphiphilic diblock copolymers (di-BCPs). Two amphiphilic di-BCPs of poly( N, N'-dimethylacrylamide)- block-polystyrene (PDMA- b-PS) with photo-cross-linkable cinnamoyl groups in either hydrophobic or hydrophilic blocks were prepared using reversible addition-fragmentation chain transfer polymerization. Intramolecular photo-cross-linking of cinnamoyl groups led to the formation of tadpole-shaped polymer single-chain nanoparticles (SCNPs) consisting of a self-collapsed block as the "head" and an un-cross-linked block as the "tail". When intramolecular photo-cross-linking was carried out in hydrophobic PS blocks, a clear morphological transition from branched cylindrical micelles (for the linear di-BCP) to completely spherical micelles at a dimerization degree of ∼63% was observed. A pattern of morphological transitions from cylindrical micelles to spherical micelles is observed through stepwise downsizing the length of cylindrical micelles when increasing the self-collapse degree of PS blocks, whereas, in case of photo-cross-linking carried out in hydrophilic PDMA blocks, the size of micelles showed a dramatic increase due to the shift of hydrophobic-to-hydrophilic balance. When the cross-linking degree of PDMA blocks reached >60%, tadpole-shaped SCNPs assembled into nonconventional aggregates with a nonsmooth surface. Our results illustrate the impact of chain topologies on the self-assembly outcomes of amphiphilic di-BCPs, which likely opens a door to control the micellar morphologies from just one parent linear di-BCP, rather than resynthesizing BPCs with different volume fractions of the two blocks.
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Yang Y, Chen G, Thanneeru S, He J, Liu K, Nie Z. Synthesis and assembly of colloidal cuboids with tunable shape biaxiality. Nat Commun 2018; 9:4513. [PMID: 30375393 PMCID: PMC6207716 DOI: 10.1038/s41467-018-06975-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Accepted: 10/01/2018] [Indexed: 12/13/2022] Open
Abstract
The design and assembly of monodisperse colloidal particles not only advances the development of functional materials, but also provides colloidal model systems for understanding phase behaviors of molecules. This communication describes the gram-scale synthesis of highly uniform colloidal cuboids with tunable dimension and shape biaxiality and their molecular mesogen-like assembly into various mesophasic structures in pristine purity. The synthesis relies on the nanoemulsion-guided generation of ammonium sulfate crystals that template the subsequent silica coating. The shape of the cuboidal particles can be tuned from square platelike, to biaxial boardlike, and to rodlike by independently controlling the length, width and thickness of the particles. We demonstrated the assembly of the cuboidal colloids into highly pure mesoscopic liquid crystal phases, including smectic A, biaxial smectic A, crystal B, discotic, and columnar phases, as well as established a correlation between mesophasic formation and colloidal biaxiality in experiments.
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Affiliation(s)
- Yang Yang
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China
| | - Guangdong Chen
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA
| | - Srinivas Thanneeru
- Department of Chemistry, Institute of Materials Sciences, University of Connecticut, Storrs, CT, 06269, USA
| | - Jie He
- Department of Chemistry, Institute of Materials Sciences, University of Connecticut, Storrs, CT, 06269, USA
| | - Kun Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
| | - Zhihong Nie
- Department of Chemistry and Biochemistry, University of Maryland, College Park, MD, 20742, USA.
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10
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Weng G, Thanneeru S, He J. Dynamic Coordination of Eu-Iminodiacetate to Control Fluorochromic Response of Polymer Hydrogels to Multistimuli. Adv Mater 2018; 30. [PMID: 29334152 DOI: 10.1002/adma.201706526] [Citation(s) in RCA: 103] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 11/29/2017] [Indexed: 05/07/2023]
Abstract
New fluorochromic materials that reversibly change their emission properties in response to their environment are of interest for the development of sensors and light-emitting materials. A new design of Eu-containing polymer hydrogels showing fast self-healing and tunable fluorochromic properties in response to five different stimuli, including pH, temperature, metal ions, sonication, and force, is reported. The polymer hydrogels are fabricated using Eu-iminodiacetate (IDA) coordination in a hydrophilic poly(N,N-dimethylacrylamide) matrix. Dynamic metal-ligand coordination allows reversible formation and disruption of hydrogel networks under various stimuli which makes hydrogels self-healable and injectable. Such hydrogels show interesting switchable ON/OFF luminescence along with the sol-gel transition through the reversible formation and dissociation of Eu-IDA complexes upon various stimuli. It is demonstrated that Eu-containing hydrogels display fast and reversible mechanochromic response as well in hydrogels having interpenetrating polymer network. Those multistimuli responsive fluorochromic hydrogels illustrate a new pathway to make smart optical materials, particularly for biological sensors where multistimuli response is required.
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Affiliation(s)
- Gengsheng Weng
- School of Materials Science and Chemical Engineering, Ningbo Key Laboratory of Specialty Polymers, Ningbo University, Ningbo, 315211, China
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
- Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
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11
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Jin L, Liu B, Wu Y, Thanneeru S, He J. Synthesis of Mesoporous CoS 2 and Ni xCo 1-xS 2 with Superior Supercapacitive Performance Using a Facile Solid-Phase Sulfurization. ACS Appl Mater Interfaces 2017; 9:36837-36848. [PMID: 28980805 DOI: 10.1021/acsami.7b11453] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Synthesis of nanostructured transition metal sulfides is of particular interest in providing new methods to control their porosity and improve their surface area because those sulfides hold promising applications in high-energy density devices. Significant challenges remain currently to prepare metal sulfides having three-dimensional (3-D) continuous mesoporous structures, known to be critical for increasing their active surface sites and enhancing ion transport. We herein present a facile solid-phase sulfurization method to synthesize 3-D continuous mesoporous CoS2, NiS2, and their binary sulfides in a two-step nanocasting using bicontinuous KIT-6 as hard templates. The solid-phase sulfurization taking place at 400 °C yields mesoporous sulfides with highly crystalline frameworks and a stoichiometric ratio of metal-to-sulfur, 1:2 (mol), within 30 min. Elemental sulfur as an inexpensive sulfur source can be directly used for the solid-phase sulfurization of mesoporous oxides of Co3O4, NiO, and their binary oxides. This facile synthetic method is highly efficient to prepare mesoporous sulfides in the gram-scale production at a very low cost. Mesoporous sulfides are demonstrated to be superior electrode materials for pseudo-supercapacitors, given their high surface area and accessible bicontinuous mesopores, the suitable crystalline sizes, and the enhanced ion transport capability. The use of binary mesoporous sulfides presents interesting synergetic effect where the doping of metal ions can significantly enhance the capacitive performance of single-component sulfides. The binary sulfides of mNi0.32Co0.68S2 show a specific capacitance up to 1698 F g-1 at a current density of 2 A g-1. The supercapacitor device of mNi0.32Co0.68S2 has a high energy density of 37 Wh kg-1 at a power density of 800 W kg-1. We believe that the reported solid-phase synthesis offers a universal method toward the conversion of mesoporous oxides materials into various useful and functional forms for energy conversion and storage applications.
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Affiliation(s)
- Lei Jin
- Department of Chemistry, and ‡Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Ben Liu
- Department of Chemistry, and ‡Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Yang Wu
- Department of Chemistry, and ‡Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Srinivas Thanneeru
- Department of Chemistry, and ‡Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
| | - Jie He
- Department of Chemistry, and ‡Polymer Program, Institute of Materials Science, University of Connecticut , Storrs, Connecticut 06269, United States
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12
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Weng G, Huang Y, Thanneeru S, Li H, Alamri A, He J. Cross-linking of COOH-containing polymers using Ag(i)-catalyzed oxidative decarboxylation in aqueous solution. Soft Matter 2017; 13:5028-5037. [PMID: 28657101 DOI: 10.1039/c7sm00825b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Cross-linking that defines the three-dimensional networks in hydrogels has a significant impact on their physiochemical properties. The cross-linking of hydrophilic polymers via post-polymerization reactions is an ideal way to manufacture hydrogels with high reproducibility and without monomer residuals. We herein report the use of Ag(i)-catalyzed oxidative decarboxylation to cross-link poly(acrylic acid) (PAA) and a family of COOH-containing hydrophilic polymers. Our method is based on the radical-mediated elimination reaction to remove COOH group(s) and generate alkyl radical(s) simultaneously, in the presence of AgNO3 and persulfates. The further intermolecular radical coupling is demonstrated to be very effective in inducing cross-linking and gelation of COOH-containing hydrophilic polymers. The cross-linking reaction can be readily achieved by simply mixing a small amount of AgNO3 (as low as 0.03 wt%) and persulfates with polymers at room temperature in air. Rheological measurements show that the gelation occurs in 20-30 min. The applications of oxidative decarboxylation in the preparation of hydrogels of COOH-containing hydrophilic copolymers and their interpenetrating polymer network (IPN) hydrogels are further validated. Finally, the residual Ag(i) ions in hydrogels are discussed in terms of how Ag(i) ions further change the mechanical and optical properties of hydrogels by photoreduction of Ag(i) to Ag nanoparticles. We expect that this Ag(i)-catalyzed oxidative decarboxylation chemistry can not only serve as a facile and general strategy to produce hydrogels through post-polymerization, but also enrich the toolbox of cross-linking chemistries of COOH-containing polymers in all forms (e.g. films, colloids and dispersions).
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Affiliation(s)
- Gengsheng Weng
- School of Materials and Chemical Engineering, Ningbo Key Laboratory of Specialty Polymers, Ningbo University, Ningbo, 315211, China and Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
| | - Yu Huang
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA. and College of Pharmacy, Ningxia Medical University, Yinchuan, 750004, China
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
| | - Hongqiang Li
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA. and College of Materials Science and Engineering, South China University of Technology, Guangzhou, 510640, China
| | - Abdullah Alamri
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA. and Institute of Materials Science, University of Connecticut, Storrs, CT 06269, USA
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Thanneeru S, Duay SS, Jin L, Fu Y, Angeles-Boza AM, He J. Single Chain Polymeric Nanoparticles to Promote Selective Hydroxylation Reactions of Phenol Catalyzed by Copper. ACS Macro Lett 2017; 6:652-656. [PMID: 35650866 DOI: 10.1021/acsmacrolett.7b00300] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Metal-containing single chain polymeric nanoparticles (SCPNs) can be used as synthetic mimics of metalloenzymes. Currently, the role of the folded polymer backbones on the activity and selectivity of metal sites is not clear. Herein, we report our findings on how polymeric frameworks modulate the coordination of Cu sites and the catalytic activity/selectivity of Cu-containing SCPNs mimicking monophenol hydroxylation reactions. Imidazole-functionalized copolymers of poly(methyl methacrylate-co-3-imidazolyl-2-hydroxy propyl methacrylate) were used for intramolecular Cu-imidazole binding that triggered the self-folding of polymers. Polymer chains imposed steric hindrance which yielded unsaturated Cu sites with an average coordination number of 3.3. Cu-containing SCPNs showed a high selectivity for the hydroxylation reaction of phenol to catechol, >80%, with a turnover frequency of >870 h-1 at 60 °C. The selectivity was largely influenced by the flexibility of the folded polymer backbone where a more flexible polymer backbone allows the cooperative catalysis of two Cu sites. The second coordination sphere provided by the folded polymer that has been less studied is therefore critical in the design of active mimics of metalloenzymes.
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Affiliation(s)
- Srinivas Thanneeru
- Department of Chemistry, and ‡Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Searle S Duay
- Department of Chemistry, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Lei Jin
- Department of Chemistry, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Youjun Fu
- Department of Chemistry, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Alfredo M Angeles-Boza
- Department of Chemistry, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Jie He
- Department of Chemistry, and Institute of Materials Science, University of Connecticut, Storrs, Connecticut 06269, United States
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14
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Liu B, Thanneeru S, Lopes A, Jin L, McCabe M, He J. Surface Engineering of Spherical Metal Nanoparticles with Polymers toward Selective Asymmetric Synthesis of Nanobowls and Janus-Type Dimers. Small 2017; 13:1700091. [PMID: 28371251 DOI: 10.1002/smll.201700091] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2017] [Revised: 02/06/2017] [Indexed: 06/07/2023]
Abstract
New synthetic methods capable of controlling structural and compositional complexities of asymmetric nanoparticles (NPs) are very challenging but highly desired. A simple and general synthetic approach to designing sophisticated asymmetric NPs by anisotropically patterning the surface of isotropic metallic NPs with amphiphilic block copolymers (BCPs) is reported. The selective galvanic replacement and seed-mediated growth of a second metal can be achieved on the exposed surface of metal NPs, resulting in the formation of nanobowls and Janus-type metal-metal dimers, respectively. Using Ag and Au NPs tethered with amphiphilic block copolymers of poly(ethylene oxide)-block-polystyrene (PEO-b-PS), anisotropic surface patterning of metallic NPs (e.g., Ag and Au) is shown to be driven by thermodynamical phase segregation of BCP ligands on isotropic metal NPs. Two proof-of-concept experiments are given on, i) synthesis of Au nanobowls by a selective galvanic replacement reaction on Janus-type patched Ag/polymer NPs; and ii) preparation of Au-Pd heterodimers and Au-Au homodimers by a seed-mediated growth on Janus-type patched Au/polymer NPs. The method shows remarkable versatility; and it can be easily handled in aqueous solution. This synthetic strategy stands out as the new methodology to design and synthesis asymmetric metal NPs with sophisticated topologies.
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Affiliation(s)
- Ben Liu
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Aaron Lopes
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Lei Jin
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Meghan McCabe
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, CT, 06269, USA
- Institute of Materials Science, University of Connecticut, Storrs, CT, 06269, USA
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15
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Thanneeru S, Nganga JK, Amin AS, Liu B, Jin L, Angeles-Boza AM, He J. Inside Cover: “Enzymatic” Photoreduction of Carbon Dioxide using Polymeric Metallofoldamers Containing Nickel-Thiolate Cofactors (ChemCatChem 7/2017). ChemCatChem 2017. [DOI: 10.1002/cctc.201700464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - John K. Nganga
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
| | | | - Ben Liu
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
| | - Lei Jin
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
| | | | - Jie He
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
- Institute of Material Science; University of Connecticut; Storrs CT 06269 USA
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16
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Thanneeru S, Nganga JK, Amin AS, Liu B, Jin L, Angeles-Boza AM, He J. “Enzymatic” Photoreduction of Carbon Dioxide using Polymeric Metallofoldamers Containing Nickel-Thiolate Cofactors. ChemCatChem 2017. [DOI: 10.1002/cctc.201601661] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
| | - John K. Nganga
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
| | | | - Ben Liu
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
| | - Lei Jin
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
| | | | - Jie He
- Department of Chemistry; University of Connecticut; Storrs CT 06269 USA
- Institute of Material Science; University of Connecticut; Storrs CT 06269 USA
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17
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Abstract
We report a facile approach to designing multiblock thermoplastic elastomers using a one-pot sequential thiol–ene reaction.
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Affiliation(s)
- Hongqiang Li
- College of Materials Science and Engineering
- South China University of Technology
- Guangzhou
- 510640 China
- Department of Chemistry
| | | | - Lei Jin
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
| | | | - Jie He
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
- Institute of Materials Science
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18
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Abstract
We report the preparation and self-assembly of amphiphilic hybrid nano building blocks (NBBs) with surfactant-mimicking structures. These NBBs, composed of hydrophilic silica-like heads tethered with well-defined one or two hydrophobic polystyrene (PS) tails, were prepared by efficient intramolecular cross-linking via silane chemistry. Using a series of "AB" diblock copolymers (BCPs) and "ABA" tri-BCPs of PS and poly(tert-butyl acrylate-co-3-(trimethoxysilyl)propyl methacrylate) (P(tBA-co-TMSPMA)), the intramolecular self-folding of P(tBA-co-TMSPMA) blocks and the deprotection of tert-butyl groups were demonstrated to be an efficient method to prepare amphiphilic NBBs with a hydrophilic silica head tethered by one or two PS tails. The formation of NBBs was carefully studied by gel permeation chromatography, nuclear magnetic resonance spectroscopy, and transmission electron microscopy. The self-assembly of these amphiphilic NBBs was further investigated by fixing the molecular weight of PS tails and varying the size of hydrophilic heads. The intramolecular cross-linking of hydrophilic heads that shifted the hydrophilic/hydrophobic balance of polymers resulted in morphological transitions from bilayered vesicles to spherical micelles. Spherical micelles prepared from NBBs with large hydrophilic heads were found to have surface protrusions that differed from the self-assembly of linear BCPs. We also observed that the chain conformation of PS tails was critical for the self-assembly of NBBs, where the bitailed NBBs with highly stretched PS tails favored bilayered vesicle structures.
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Affiliation(s)
- Weikun Li
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Istvan Kanyo
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Ben Liu
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
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19
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Liu B, Kuo CH, Chen J, Luo Z, Thanneeru S, Li W, Song W, Biswas S, Suib SL, He J. Ligand-Assisted Co-Assembly Approach toward Mesoporous Hybrid Catalysts of Transition-Metal Oxides and Noble Metals: Photochemical Water Splitting. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502892] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Liu B, Kuo CH, Chen J, Luo Z, Thanneeru S, Li W, Song W, Biswas S, Suib SL, He J. Ligand-Assisted Co-Assembly Approach toward Mesoporous Hybrid Catalysts of Transition-Metal Oxides and Noble Metals: Photochemical Water Splitting. Angew Chem Int Ed Engl 2015; 54:9061-5. [DOI: 10.1002/anie.201502892] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Revised: 04/27/2015] [Indexed: 01/23/2023]
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21
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Li W, Kanyo I, Kuo CH, Thanneeru S, He J. pH-programmable self-assembly of plasmonic nanoparticles: hydrophobic interaction versus electrostatic repulsion. Nanoscale 2015; 7:956-964. [PMID: 25463509 DOI: 10.1039/c4nr05743k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report a general strategy to conceptualize a new design for the pH-programmable self-assembly of plasmonic gold nanoparticles (AuNPs) tethered by random copolymers of poly(styrene-co-acrylic acid) (P(St-co-AA)). It is based on using pH as an external stimulus to reversibly change the surface charge of polymer tethers and to control the delicate balance of interparticle attractive and repulsive interactions. By incorporating -COOH moieties locally within PSt hydrophobic segments, the change in the ionization degree of -COOH moieties can dramatically disrupt the hydrophobic attraction within a close distance. pH acts as a key parameter to control the deprotonation of -COOH moieties and "programs" the assembled nanostructures of plasmonic nanoparticles in a stepwise manner. At a higher solution pH where -COOH groups of polymer tethers became highly deprotonated, electrostatic repulsion dominated the self-assembly and favored the formation of end-to-end, anisotropic assemblies, e.g. 1-D single-line chains. At a lower pH, the less deprotonated -COOH groups led to the decrease of electrostatic repulsion and the side-to-side aggregates, e.g. clusters and multi-line chains of AuNPs, became favorable. The pH-programmable self-assembly allowed us to engineer a "manual" program for a sequential self-assembly by changing the pH of the solution. We demonstrated that the two-step pH-programmable assembly could generate more sophisticated "multi-block" chains using two differently sized AuNPs. Our strategy offers a general means for the programmable design of plasmonic nanoparticles into the specific pre-ordained nanostructures that are potentially useful for the precise control over their plasmon coupling.
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Affiliation(s)
- Weikun Li
- Department of Chemistry, University of Connecticut, Storrs, CT 06269, USA.
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22
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Kuo CH, Mosa IM, Thanneeru S, Sharma V, Zhang L, Biswas S, Aindow M, Pamir Alpay S, Rusling JF, Suib SL, He J. Facet-dependent catalytic activity of MnO electrocatalysts for oxygen reduction and oxygen evolution reactions. Chem Commun (Camb) 2015; 51:5951-4. [DOI: 10.1039/c5cc01152c] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The MnO(100) facets with higher adsorption energy of O species can largely promote the electrocatalytic activity.
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Affiliation(s)
- Chung-Hao Kuo
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
| | - Islam M. Mosa
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
- Department of Chemistry
| | | | - Vinit Sharma
- Department of Materials Science and Engineering and Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - Lichun Zhang
- Department of Materials Science and Engineering and Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - Sourav Biswas
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
| | - Mark Aindow
- Department of Materials Science and Engineering and Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | - S. Pamir Alpay
- Department of Materials Science and Engineering and Institute of Materials Science
- University of Connecticut
- Storrs
- USA
| | | | - Steven L. Suib
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
- Department of Materials Science and Engineering and Institute of Materials Science
| | - Jie He
- Department of Chemistry
- University of Connecticut
- Storrs
- USA
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23
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Li W, Kuo CH, Kanyo I, Thanneeru S, He J. Synthesis and Self-Assembly of Amphiphilic Hybrid Nano Building Blocks via Self-Collapse of Polymer Single Chains. Macromolecules 2014. [DOI: 10.1021/ma501338s] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Weikun Li
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Chung-Hao Kuo
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Istvan Kanyo
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Srinivas Thanneeru
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
| | - Jie He
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269, United States
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