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Ye S, Zhai Z, Song Z, Shang S, Song B. Cellulose nanocrystals enhanced viscoelasticity and temperature-resistance of rosin-based wormlike micelles: Inducing the formation of hydrogels. J Mol Liq 2023. [DOI: 10.1016/j.molliq.2023.121527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
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Bhat B, Pahari S, Kwon JSI, Akbulut MES. Rheological dynamics and structural characteristics of supramolecular assemblies of β-cyclodextrin and sulfonic surfactants. SOFT MATTER 2023; 19:2231-2240. [PMID: 36912013 DOI: 10.1039/d3sm00132f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Cyclodextrins are highly functional compounds with a hydrophobic cavity capable of forming supramolecular inclusion complexes with various classes of molecules including surfactants. The resultant rich nanostructures and their dynamics are an interesting research problem in the area of soft condensed matter and related applications. Herein, we report novel dynamical supramolecular assemblies based on the complexation of β-cyclodextrin with 3 different sulfonic surfactants, which are sodium hexadecylsulfate, sodium dodecylbenzenesulfonate, and myristyl sulfobetaine. It was observed that a β-cyclodextrin : surfactant/2 : 1 molar ratio was ideal for inducing axial growth and imparting large viscosities in the suspensions. Such complexation processes were accompanied by intriguing nanostructural phase behaviors and rheological properties that were very sensitive to the molecular architecture of sulfonic surfactants. The presence of an amino group in the head group of the surfactant allowed for large viscosities that reached 2.4 × 104 Pa s which exhibited gel-like behavior. In contrast, smaller viscosity values with a lower consistency index were observed when a bulky aromatic ring was present instead. DIC microscopy was used to visually probe the microstructure of the systems with respect to sulfonate molecular architecture. Additionally, surface tension measurements, and FTIR and NMR spectroscopies were used to gain insights into the nature of interactions that lead to the complexation and nanostructural characteristics. Finally, mechanics correlating the supramolecular morphologies to the rheological properties were proposed.
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Affiliation(s)
- Bhargavi Bhat
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
| | - Silabrata Pahari
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
| | - Joseph Sang-Il Kwon
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
- Texas A&M Energy Institute, College Station, TX 77843, USA
| | - Mustafa E S Akbulut
- Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX 77843, USA.
- Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA
- Texas A&M Energy Institute, College Station, TX 77843, USA
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Schmitt J, Calabrese V, da Silva MA, Hossain KMZ, Li P, Mahmoudi N, Dalgliesh RM, Washington AL, Scott JL, Edler KJ. Surfactant induced gelation of TEMPO-oxidized cellulose nanofibril dispersions probed using small angle neutron scattering. J Chem Phys 2023; 158:034901. [PMID: 36681636 DOI: 10.1063/5.0129276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
In this work, we studied TEMPO-oxidized cellulose nanofibril (OCNF) suspensions in the presence of diverse surfactants. Using a combination of small angle neutron scattering (SANS) and rheology, we compared the physical properties of the suspensions with their structural behavior. Four surfactants were studied, all with the same hydrophobic tail length but different headgroups: hexaethylene glycol mono-n-dodecyl ether (C12EO6, nonionic), sodium dodecyl sulfate (SDS, anionic), cocamidopropyl betaine (CapB, zwitterionic), and dodecyltrimethylammonium bromide (DTAB, cationic). Contrast variation SANS studies using deuterated version of C12EO6 or SDS, or by varying the D2O/H2O ratio of the suspensions (with CapB), allowed focusing only on the structural properties of OCNFs or surfactant micelles. We showed that, in the concentration range studied, for C12EO6, although the nanofibrils are concentrated thanks to an excluded volume effect observed in SANS, the rheological properties of the suspensions are not affected. Addition of SDS or CapB induces gelation for surfactant concentrations superior to the critical micellar concentration (CMC). SANS results show that attractive interactions between OCNFs arise in the presence of these anionic or zwitterionic surfactants, hinting at depletion attraction as the main mechanism of gelation. Finally, addition of small amounts of DTAB (below the CMC) allows formation of a tough gel by adsorbing onto the OCNF surface.
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Affiliation(s)
- Julien Schmitt
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Vincenzo Calabrese
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Marcelo A da Silva
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Kazi M Z Hossain
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Peixun Li
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Najet Mahmoudi
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Robert M Dalgliesh
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Adam L Washington
- ISIS Neutron and Muon Source, Science and Technology Facilities Council, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Janet L Scott
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
| | - Karen J Edler
- Department of Chemistry, University of Bath, Bath BA2 7AY, United Kingdom
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Liu Y, Lin SH, Chuang WT, Dai NT, Hsu SH. Biomimetic Strain-Stiffening in Chitosan Self-Healing Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2022; 14:16032-16046. [PMID: 35321544 DOI: 10.1021/acsami.2c01720] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The strain-stiffening and self-healing capabilities of biological tissues enable them to preserve the structures and functions from deformation and damage. However, biodegradable hydrogel materials with both of these biomimetic characteristics have not been explored. Here, a series of strain-stiffened, self-healing hydrogels are developed through dynamic imine crosslinking of semiflexible O-carboxymethyl chitosan (main chain) and flexible dibenzaldehyde-terminated telechelic poly(ethylene glycol) (crosslinker). The biomimetic hydrogels can be reversibly stiffened to resist the deformation and can even recover to their original state after repeated damages. The mechanical properties and stiffening responses of the hydrogels are tailored by varying the component contents (1-3%) and the crosslinker length (4 or 8 kDa). A combinatorial system of in situ coherent small-angle X-ray scattering with rheological testing is developed to investigate the network structures (in sizes 1.5-160 nm) of hydrogels under shear strains and reveals that the strain-stiffening originates from the fibrous chitosan network with poly(ethylene glycol) crosslinking fixation. The biomimetic hydrogels with biocompatibility and biodegradability promote wound healing. The study provides an insight into the nanoscale design of biomimetic strain-stiffening self-healing hydrogels for biomedical applications.
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Affiliation(s)
- Yi Liu
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C
| | - Shih-Ho Lin
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C
| | - Wei-Tsung Chuang
- National Synchrotron Radiation Research Center, Hsinchu, Taiwan 30076, R.O.C
| | - Niann-Tzyy Dai
- Division of Plastic and Reconstructive Surgery, Department of Surgery, Tri-Service General Hospital, National Defense Medical Center, Taipei, Taiwan 11490, R.O.C
| | - Shan-Hui Hsu
- Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C
- Institute of Cellular and System Medicine, National Health Research Institutes, Miaoli, Taiwan 35053, R.O.C
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Bryant SJ, Calabrese V, da Silva MA, Zakir Hossain KM, Scott JL, Edler KJ. Rheological modification of partially oxidised cellulose nanofibril gels with inorganic clays. PLoS One 2021; 16:e0252660. [PMID: 34234363 PMCID: PMC8263268 DOI: 10.1371/journal.pone.0252660] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 05/20/2021] [Indexed: 11/18/2022] Open
Abstract
This study aimed to quantify the influence of clays and partially oxidised cellulose nanofibrils (OCNF) on gelation as well as characterise their physical and chemical interactions. Mixtures of Laponite and montmorillonite clays with OCNF form shear-thinning gels that are more viscous across the entire shear range than OCNF on its own. Viscosity and other rheological properties can be fine-tuned using different types of clay at different concentrations (0.5–2 wt%). Laponite particles are an order of magnitude smaller than those of montmorillonite (radii of 150 Å compared to 2000 Å) and are therefore able to facilitate networking of the cellulose fibrils, resulting in stronger effects on rheological properties including greater viscosity. This work presents a mechanism for modifying rheological properties using renewable and environmentally-friendly nanocellulose and clays which could be used in a variety of industrial products including home and personal care formulations.
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Affiliation(s)
- Saffron J. Bryant
- Department of Chemistry, University of Bath, Claverton Down, Bath, United Kingdom
- School of Science, RMIT University, Melbourne, Victoria, Australia
- * E-mail: (SJB); (KJE)
| | - Vincenzo Calabrese
- Department of Chemistry, University of Bath, Claverton Down, Bath, United Kingdom
| | - Marcelo A. da Silva
- Department of Chemistry, University of Bath, Claverton Down, Bath, United Kingdom
| | | | - Janet L. Scott
- Department of Chemistry, University of Bath, Claverton Down, Bath, United Kingdom
- Centre for Sustainable Chemical Technologies, University of Bath, Claverton Down, Bath, United Kingdom
| | - Karen J. Edler
- Department of Chemistry, University of Bath, Claverton Down, Bath, United Kingdom
- * E-mail: (SJB); (KJE)
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Identification of 24 Unknown Substances (NIAS/IAS) from Food Contact Polycarbonate by LC-Orbitrap Tribrid HRMS-DDMS3: Safety Assessment. Int J Anal Chem 2021. [DOI: 10.1155/2021/6654611] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Twenty-four substances, mainly NIAS, have been tentatively identified in food contact polycarbonate through the application a new, fast, and automated analytical strategy for the investigation of unknowns in food contact materials. Most of the identified compounds were plasticizers, slip agents, antioxidants, and ultraviolet stabilizers and fragrances, and the majority of them have not been previously identified in PC food contact materials. The workflow setup includes an intelligent data acquisition applied using LC-Orbitrap Tribrid-HRMS (MS3), with an automated data processing using Compound DiscovererTM. To obtain a high confidence identification of unknown substances, a very strict criterion has been established, which comprises exact mass, isotopic profile, MS2 match, retention time, and MS3 match. To check for the safety of the migration from the food contact polycarbonate, a risk assessment was achieved using the threshold of the toxicological concern (TTC) approach. Except for the slip agent hexadecanamide, the compounds tentatively identified do not represent a risk.
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Hossain KMZ, Calabrese V, da Silva MA, Bryant SJ, Schmitt J, Ahn-Jarvis JH, Warren FJ, Khimyak YZ, Scott JL, Edler KJ. Monovalent Salt and pH-Induced Gelation of Oxidised Cellulose Nanofibrils and Starch Networks: Combining Rheology and Small-Angle X-ray Scattering. Polymers (Basel) 2021; 13:951. [PMID: 33808830 PMCID: PMC8003611 DOI: 10.3390/polym13060951] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 03/16/2021] [Accepted: 03/17/2021] [Indexed: 01/01/2023] Open
Abstract
Water quality parameters such as salt content and various pH environments can alter the stability of gels as well as their rheological properties. Here, we investigated the effect of various concentrations of NaCl and different pH environments on the rheological properties of TEMPO-oxidised cellulose nanofibril (OCNF) and starch-based hydrogels. Addition of NaCl caused an increased stiffness of the OCNF:starch (1:1 wt%) blend gels, where salt played an important role in reducing the repulsive OCNF fibrillar interactions. The rheological properties of these hydrogels were unchanged at pH 5.0 to 9.0. However, at lower pH (4.0), the stiffness and viscosity of the OCNF and OCNF:starch gels appeared to increase due to proton-induced fibrillar interactions. In contrast, at higher pH (11.5), syneresis was observed due to the formation of denser and aggregated gel networks. Interactions as well as aggregation behaviour of these hydrogels were explored via ζ-potential measurements. Furthermore, the nanostructure of the OCNF gels was probed using small-angle X-ray scattering (SAXS), where the SAXS patterns showed an increase of slope in the low-q region with increasing salt concentration arising from aggregation due to the screening of the surface charge of the fibrils.
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Affiliation(s)
- Kazi M. Zakir Hossain
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
| | - Vincenzo Calabrese
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
| | - Marcelo A. da Silva
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
| | - Saffron J. Bryant
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
| | - Julien Schmitt
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
| | - Jennifer H. Ahn-Jarvis
- Food Innovation and Health, Quadram Institute Bioscience, Norwich Research Park, Norwich NR4 7UQ, UK; (J.H.A.-J.); (F.J.W.)
| | - Frederick J. Warren
- Food Innovation and Health, Quadram Institute Bioscience, Norwich Research Park, Norwich NR4 7UQ, UK; (J.H.A.-J.); (F.J.W.)
| | | | - Janet L. Scott
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
- Centre for Sustainable Chemical Technologies, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Karen J. Edler
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK; (K.M.Z.H.); (V.C.); (M.A.d.S.); (S.J.B.); (J.S.); (J.L.S.)
- Centre for Sustainable Chemical Technologies, University of Bath, Claverton Down, Bath BA2 7AY, UK
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