1
|
Yoshida M, Iwase H, Horikawa Y, Shikata T. Evidence of a Rod-like Structure for Hydroxypropyl Cellulose Samples in Aqueous Solution. Biomacromolecules 2024; 25:4255-4266. [PMID: 38814246 DOI: 10.1021/acs.biomac.4c00334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2024]
Abstract
Because hydroxypropyl cellulose (HpC) is a popular polymeric material that forms a liquid crystalline phase in solutions with various kinds of solvents, including water, it is commonly thought that HpC has a typical rod-like structure in solution. In this study, the structures of commercial HpC samples in aqueous solution with average molar substitution numbers (MS) ranging from 3.6 to 3.9 and weight-average molar masses (Mw) ranging from 36 to 740 kg mol-1 were investigated in detail. We first used multiple techniques, including standard static and dynamic light scattering (SLS and DLS), neutron and X-ray scattering experiments, and viscometric measurements, to obtain clear evidence of rod-like structures quantitatively. The dependence of excess scattering intensities for HpC samples under dilute conditions on the magnitude of the scattering vector over a wide range from 8.9 × 10-3 to 3.0 × 10 nm-1 was reasonably described by the form factor of rod particles with length (L) and diameter (d). Although the determined L value was close to the contour length (lc) calculated from the Mw values in the lower Mw range, L became obviously less than lc with increasing Mw. The radius of gyration (Rg) determined via SLS measurements was proportional to L by a factor of approximately 3.5 ∼ √12 over the Mw range examined. These observations revealed that the conformation of HpC molecules changes from an elongated single chain to a certain folded structure, maintaining the shape of the rod-shaped particles. Moreover, the Mw dependencies of the intrinsic viscosities and translational diffusion coefficients of the HpC samples resulting from DLS measurements were reasonably described with a theoretical rod-like particle model, assuming that L and d are identical to those resulting from the scattering behaviors.
Collapse
Affiliation(s)
- Misato Yoshida
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Hiroki Iwase
- Neutron Science and Technology Center, Comprehensive Research Organization for Science and Society (CROSS), 162-1 Shirakata, Tokai, Ibaraki 319-1106, Japan
| | - Yoshiki Horikawa
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Toshiyuki Shikata
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| |
Collapse
|
2
|
Liao Q, Ren H, Xu J, Wang P, Yuan B, Zhang H. Combined experiments and molecular simulations for understanding the thermo-responsive behavior and gelation of methylated glucans with different glycosidic linkages. J Colloid Interface Sci 2024; 674:315-325. [PMID: 38936088 DOI: 10.1016/j.jcis.2024.06.187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2024] [Revised: 06/13/2024] [Accepted: 06/24/2024] [Indexed: 06/29/2024]
Abstract
HYPOTHESIS Elucidation of the micro-mechanisms of sol-gel transition of gelling glucans with different glycosidic linkages is crucial for understanding their structure-property relationship and for various applications. Glucans with distinct molecular chain structures exhibit unique gelation behaviors. The disparate gelation phenomena observed in two methylated glucans, methylated (1,3)-β-d-glucan of curdlan (MECD) and methylated (1,4)-β-d-glucan of cellulose (MC), notwithstanding their equivalent degrees of substitution, are intricately linked to their unique molecular architectures and interactions between glucan and water. EXPERIMENTS Density functional theory and molecular dynamics simulations focused on the electronic property distinctions between MECD and MC, alongside conformational variations during thermal gelation. Inline attenuated total reflection Fourier transform infrared spectroscopy tracked secondary structure alterations in MECD and MC. To corroborate the simulation results, additional analyses including circular dichroism, rheology, and micro-differential scanning calorimetry were performed. FINDINGS Despite having similar thermally induced gel networks, MECD and MC display distinct physical gelation patterns and molecular-level conformational changes during gelation. The network of MC gel was formed via a "coil-to-ring" transition, followed by ring stacking. In contrast, the MECD gel comprised compact irregular helices accompanied by notable volume shrinkage. These variations in gelation behavior are ascribed to heightened hydrophobic interactions and diminished hydrogen bonding in both systems upon heating, resulting in gelation. These findings provide valuable insights into the microstructural changes during gelation and the thermo-gelation mechanisms of structurally similar polysaccharides.
Collapse
Affiliation(s)
- Qingyu Liao
- Advanced Rheology Institute, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Huimin Ren
- Advanced Rheology Institute, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Jiatong Xu
- Advanced Rheology Institute, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Pengguang Wang
- Advanced Rheology Institute, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Baihua Yuan
- Institute of Marine Equipment, Shanghai Jiao Tong University, Shanghai 200240, China.
| | - Hongbin Zhang
- Advanced Rheology Institute, Department of Polymer Science and Engineering, School of Chemistry and Chemical Engineering, Shanghai Key Laboratory of Electrical Insulation and Thermal Aging, Shanghai Jiao Tong University, Shanghai 200240, China.
| |
Collapse
|
3
|
Bonetti L, Borsacchi S, Soriente A, Boccali A, Calucci L, Raucci MG, Altomare L. Injectable in situ gelling methylcellulose-based hydrogels for bone tissue regeneration. J Mater Chem B 2024; 12:4427-4440. [PMID: 38629219 DOI: 10.1039/d3tb02414h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2024]
Abstract
Injectable bone substitutes (IBSs) represent a compelling choice for bone tissue regeneration, as they can be exploited to optimally fill complex bone defects in a minimally invasive manner. In this context, in situ gelling methylcellulose (MC) hydrogels may be engineered to be free-flowing injectable solutions at room temperature and gels upon exposure to body temperature. Moreover, incorporating a suitable inorganic phase can further enhance the mechanical properties of MC hydrogels and promote mineralization, thus assisting early cell adhesion to the hydrogel and effectively guiding bone tissue regeneration. In this work, thermo-responsive IBSs were designed selecting MC as the organic matrix and calcium phosphate (CaP) or CaP modified with graphene oxide (CaPGO) as the inorganic component. The resulting biocomposites displayed a transition temperature around body temperature, preserved injectability even after loading with the inorganic components, and exhibited adequate retention on an ex vivo calf femoral bone defect model. The addition of CaP and CaPGO promoted the in vitro mineralization process already 14 days after immersion in simulated body fluid. Interestingly, combined X-ray diffraction and solid state nuclear magnetic resonance characterizations revealed that the formed biomimetic phase was constituted by crystalline hydroxyapatite and amorphous calcium phosphate. In vitro biological characterization revealed the beneficial impact of CaP and CaPGO, indicating their potential in promoting cell adhesion, proliferation and osteogenic differentiation. Remarkably, the addition of GO, which is very attractive for its bioactive properties, did not negatively affect the injectability of the hydrogel nor the mineralization process, but had a positive impact on cell growth and osteogenic differentiation on both pre-differentiated and undifferentiated cells. Overall, the proposed formulations represent potential candidates for use as IBSs for application in bone regeneration both under physiological and pathological conditions.
Collapse
Affiliation(s)
- Lorenzo Bonetti
- Department of Chemistry, Materials, and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
| | - Silvia Borsacchi
- Institute of Chemistry of Organometallic Compounds (ICCOM), Italian National Research Council (CNR), Via G. Moruzzi 1, 56124 Pisa, Italy.
- Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Alessandra Soriente
- Institute for Polymers, Composites and Biomaterials (IPCB), Italian National Research Council, Viale J.F. Kennedy 54, Mostra d'Oltremare Pad 20, 80125 Napoli, Italy
| | - Alberto Boccali
- Department of Chemistry, Materials, and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
| | - Lucia Calucci
- Institute of Chemistry of Organometallic Compounds (ICCOM), Italian National Research Council (CNR), Via G. Moruzzi 1, 56124 Pisa, Italy.
- Center for Instrument Sharing of the University of Pisa (CISUP), Lungarno Pacinotti 43/44, 56126 Pisa, Italy
| | - Maria Grazia Raucci
- Institute for Polymers, Composites and Biomaterials (IPCB), Italian National Research Council, Viale J.F. Kennedy 54, Mostra d'Oltremare Pad 20, 80125 Napoli, Italy
| | - Lina Altomare
- Department of Chemistry, Materials, and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.
- National Interuniversity Consortium for Materials Science and Technology (INSTM), Via Giuseppe Giusti 9, 50121 Firenze, Italy
| |
Collapse
|
4
|
Gao J, Li X, Xu L, Yan M, Bi H, Wang Q. Transparent multifunctional cellulose-based conductive hydrogel for wearable strain sensors and arrays. Carbohydr Polym 2024; 329:121784. [PMID: 38286530 DOI: 10.1016/j.carbpol.2024.121784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/02/2024] [Accepted: 01/03/2024] [Indexed: 01/31/2024]
Abstract
Conductive hydrogels as promising candidate materials for flexible strain sensors have gained considerable attentions. However, it is still a great challenge to construct hydrogel with multifunctional performance via natural polymer. Herein, a novel multifunctional conductive hydrogel based on methylcellulose and cellulose nanocrystal was prepared via a facile and low-cost strategy. Methylcellulose (MC) was introduced to not only guarantee the stability of tannic acid coated cellulose nanocrystal (TA@CNCs) in LiCl solution, but also improve anti-freezing ability. The obtained hydrogel exhibited high transparency (98 % at 800 nm), good stretchability (663.1 %), low temperature tolerance (-23.9 °C), superior conductivity (2.89 S/m) and excellent UV shielding behavior. Flexible strain sensor assembled by the prepared hydrogels can be used to detect human body motions include subtle and large motions, and exhibited good sensitivity and stability over a wide temperature range. Multiple flexible hydrogels can also be assembled into a 3D sensor array to detect the distribution and magnitude of spatial pressure. Therefore, the hydrogels prepared via natural polymers will have broad application prospects in wearable devices, electronic skin and multifunctional sensor components.
Collapse
Affiliation(s)
- Jianliang Gao
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
| | - Xiaomeng Li
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
| | - Lina Xu
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
| | - Manqing Yan
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China
| | - Hong Bi
- School of Materials Science and Engineering, Anhui University, Hefei 230601, China
| | - Qiyang Wang
- School of Chemistry and Chemical Engineering, Anhui University, Hefei 230601, China.
| |
Collapse
|
5
|
Wu Z, Collins AM, Jayaraman A. Understanding Self-Assembly and Molecular Packing in Methylcellulose Aqueous Solutions Using Multiscale Modeling and Simulations. Biomacromolecules 2024; 25:1682-1695. [PMID: 38417021 DOI: 10.1021/acs.biomac.3c01209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
We present a multiscale molecular dynamics (MD) simulation study on self-assembly in methylcellulose (MC) aqueous solutions. First, using MD simulations with a new coarse-grained (CG) model of MC chains in implicit water, we establish how the MC chains self-assemble to form fibrils and fibrillar networks and elucidate the MC chains' packing within the assembled fibrils. The CG model for MC is extended from a previously developed model for unsubstituted cellulose and captures the directionality of H-bonding interactions between the -OH groups. The choice and placement of the CG beads within each monomer facilitates explicit modeling of the exact degree and position of methoxy substitutions in the monomers along the MC chain. CG MD simulations show that with increasing hydrophobic effect and/or increasing H-bonding strength, the commercial MC chains (with degree of methoxy substitution, DS, ∼1.8) assemble from a random dispersed configuration into fibrils. The assembled fibrils exhibit consistent fibril diameters regardless of the molecular weight and concentration of MC chains, in agreement with past experiments. Most MC chains' axes are aligned with the fibril axis, and some MC chains exhibit twisted conformations in the fibril. To understand the molecular driving force for the twist, we conduct atomistic simulations of MC chains preassembled in fibrils (without any chain twists) in explicit water at 300 and 348 K. These atomistic simulations also show that at DS = 1.8, MC chains adopt twisted conformations, with these twists being more prominent at higher temperatures, likely as a result of shielding of hydrophobic methyl groups from water. For MC chains with varying DS, at 348 K, atomistic simulations show a nonmonotonic effect of DS on water-monomer contacts. For 0.0 < DS < 0.6, the MC monomers have more water contacts than at DS = 0.0 or DS > 0.6, suggesting that with few methoxy substitutions, the MC chains are effectively hydrophilic, letting the water molecules diffuse into the fibril to participate in H-bonds with the MC chains' remaining -OH groups. At DS > 0.6, the MC monomers become increasingly hydrophobic, as seen by decreasing water contacts around each monomer. We conclude based on the atomistic observations that MC chains with lower degrees of substitutions (DS ≤ 0.6) should exhibit solubility in water over broader temperature ranges than DS ∼ 1.8 chains.
Collapse
Affiliation(s)
- Zijie Wu
- Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
| | - Audrey M Collins
- Department of Chemistry and Biochemistry, University of Delaware, 102 Brown Laboratory, Newark, Delaware 19716, United States
| | - Arthi Jayaraman
- Department of Chemical and Biomolecular Engineering, University of Delaware, 150 Academy Street, Newark, Delaware 19716, United States
- Department of Materials Science and Engineering, University of Delaware, 201 DuPont Hall, Newark, Delaware 19716, United States
| |
Collapse
|
6
|
Legrand G, Baeza GP, Peyla M, Porcar L, Fernández-de-Alba C, Manneville S, Divoux T. Acid-Induced Gelation of Carboxymethylcellulose Solutions. ACS Macro Lett 2024:234-239. [PMID: 38301141 DOI: 10.1021/acsmacrolett.3c00677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2024]
Abstract
The present work offers a comprehensive description of the acid-induced gelation of carboxymethylcellulose (CMC), a water-soluble derivative of cellulose broadly used in numerous applications ranging from food packaging to biomedical engineering. Linear viscoelastic properties measured at various pH and CMC contents allow us to build a sol-gel phase diagram and show that CMC gels exhibit broad power-law viscoelastic spectra that can be rescaled onto a master curve following a time-composition superposition principle. These results demonstrate the microstructural self-similarity of CMC gels and inspire a mean-field model based on hydrophobic interchain association that accounts for the sol-gel boundary over the entire range of CMC content under study. Neutron scattering experiments further confirm this picture and suggest that CMC gels comprise a fibrous network cross-linked by aggregates. Finally, low-field NMR measurements offer an original signature of acid-induced gelation from a solvent perspective. Altogether, these results open avenues for the precise manipulation and control of CMC-based hydrogels.
Collapse
Affiliation(s)
| | - Guilhem P Baeza
- Univ Lyon, INSA Lyon, UCBL, CNRS, MATEIS, UMR5510, 69621 Villeurbanne, France
| | - Matteo Peyla
- ENSL, CNRS, Laboratoire de Physique, F-69342 Lyon, France
| | | | - Carlos Fernández-de-Alba
- Université de Lyon, CNRS, Université Claude Bernard Lyon 1, INSA Lyon, Université Jean Monnet, UMR 5223, Ingénierie des Matériaux Polymères, Service RMN Polymères de l'ICL, F-69621 Cédex, France
| | - Sébastien Manneville
- ENSL, CNRS, Laboratoire de Physique, F-69342 Lyon, France
- Institut Universitaire de France (IUF), https://www.iufrance.fr/
| | - Thibaut Divoux
- ENSL, CNRS, Laboratoire de Physique, F-69342 Lyon, France
| |
Collapse
|
7
|
Nakagawa D, Saiki E, Horikawa Y, Shikata T. Rigid Rod-like Viscoelastic Behaviors of Methyl Cellulose Samples with a Wide Range of Molar Masses Dissolved in Aqueous Solutions. Molecules 2024; 29:466. [PMID: 38257380 PMCID: PMC10818544 DOI: 10.3390/molecules29020466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Revised: 01/10/2024] [Accepted: 01/16/2024] [Indexed: 01/24/2024] Open
Abstract
The viscoelastic behaviors of aqueous solutions of commercially available methyl cellulose (MC) samples with a degree of substitution of 1.8 and a wide range of weight average molar masses (Mw) were investigated over a wide concentration (c) range at some temperatures from -10 to 25 °C. The viscoelastic parameters useful to discuss the structure and dynamics of MC-forming particles in aqueous solutions were precisely determined, such as the zero-shear viscosity (η0), the steady-state compliance (Je), the average relaxation time (τw), and the activation energy (E*) of τw. Because previously obtained scattering and intrinsic viscosity ([η]) data revealed that the MC samples possess a rigid rod-like structure in dilute aqueous solutions over the entire Mw range examined, the viscoelastic data obtained in this study were discussed in detail based on the concept of rigid rod particle suspension rheology. The obtained Je-1 was proportional to the number density of sample molecules (ν = cNAMw-1, where NA means the Avogadro's constant) over the ν range examined irrespective of Mw. The reduced relaxation time (4NAτw(3νJe [η]ηmMw)-1), where ηm means the medium viscosity, was proportional to (νL3)2, L; the average particle length depending on Mw for each sample was determined in a previous study; and the reduced specific viscosity (ηspNAL3(Mw [η])-1), where ηsp means the specific viscosity, was proportional to (νL3)3 in a range of νL3 < 3 × 102. These findings were typical characteristics of the rigid rod suspension rheology. Therefore, the MC samples behave as entangling rigid rod particles in the νL3 range from rheological points of view. A stepwise increase in E* was clearly observed in a c range higher than the [η]-1 value irrespective of Mw. This observation proposes that contact or entanglement formation between particles formed by MC molecules results in an increase in E*.
Collapse
Affiliation(s)
- Daiki Nakagawa
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-Materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Erika Saiki
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-Materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Yoshiki Horikawa
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-Materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Toshiyuki Shikata
- Cellulose Research Unit, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
- Division of Natural Resources and Eco-Materials, Graduate School of Agriculture, Tokyo University of Agriculture and Technology, 3-5-8 Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| |
Collapse
|
8
|
Bonetti L, De Nardo L, Farè S. Crosslinking strategies in modulating methylcellulose hydrogel properties. SOFT MATTER 2023; 19:7869-7884. [PMID: 37817578 DOI: 10.1039/d3sm00721a] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/12/2023]
Abstract
Methylcellulose (MC) hydrogels are ideal materials for the design of thermo-responsive platforms capable of exploiting the environment temperature as a driving force to activate their smart transition. However, MC hydrogels usually show reduced stability in an aqueous environment and low mechanical properties, limiting their applications' breadth. A possible approach intended to overcome these limitations is chemical crosslinking, which represents a simple yet effective strategy to modify the MC hydrogels' properties (e.g., physicochemical, mechanical, and biological). In this regard, understanding the selected crosslinking method's role in modulating the MC hydrogels' properties is a key factor in their design. This review offers a perspective on the main MC chemical crosslinking approaches reported in the literature. Three main categories can be distinguished: (i) small molecule crosslinkers, (ii) crosslinking by high-energy radiation, and (iii) crosslinking via MC chemical modification. The advantages and limitations of each approach are elucidated, and special consideration is paid to the thermo-responsive properties after crosslinking towards the development of MC hydrogels with enhanced physical stability and mechanical performance, preserving the thermo-responsive behavior.
Collapse
Affiliation(s)
- Lorenzo Bonetti
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 22, 20133, Milan, Italy.
| | - Luigi De Nardo
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 22, 20133, Milan, Italy.
- National Interuniversity Consortium of Materials Science and Technology (INSTM), 50121 Florence, Italy
| | - Silvia Farè
- Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Piazza Leonardo da Vinci 22, 20133, Milan, Italy.
- National Interuniversity Consortium of Materials Science and Technology (INSTM), 50121 Florence, Italy
| |
Collapse
|
9
|
Wilcox KG, Dingle ME, Saha A, Hore MJA, Morozova S. Persistence length of α-helical poly-L-lysine. SOFT MATTER 2022; 18:6550-6560. [PMID: 36039676 DOI: 10.1039/d2sm00921h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The α-helix has a significant role in protein function and structure because of its rigidity. In this study, we investigate the persistence length, lp, of α-helical poly-L-lysine, PLL, for two molecular weights. PLL experiences a random coil-helix transition as the pH is raised from 7 to 12. Using light scattering experiments to determine the radius of gyration (Rg), hydrodynamic radius, (Rh), the shape factor (Rg/Rh), and second virial coefficient (A2), and circular dichroism to determine the helical content, we find the structure and lp of PLL as a function of pH (7.4-11.4) and ionic strength (100-166 mM). With increasing pH, we find an increase in lp from 2 nm to 15-21 nm because of α-helix formation. We performed dissipative particle dynamics (DPD) simulations and found a similar increase in lp. While this lp is less than that predicted by molecular dynamics simulations, it is consistent with other experimental results, which quantify the mechanics of α-helices. By determining the mechanics of helical polypeptides like PLL, we can further understand their implications to protein function.
Collapse
Affiliation(s)
- Kathryn G Wilcox
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, USA.
| | - Marlee E Dingle
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, USA.
| | - Ankit Saha
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, USA.
| | - Michael J A Hore
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, USA.
| | - Svetlana Morozova
- Department of Macromolecular Science and Engineering, Case Western Reserve University, Cleveland, OH, USA.
| |
Collapse
|
10
|
Bizmark N, Caggiano NJ, Liu JX, Arnold CB, Prud'homme RK, Datta SS, Priestley RD. Hysteresis in the thermally induced phase transition of cellulose ethers. SOFT MATTER 2022; 18:6254-6263. [PMID: 35946517 DOI: 10.1039/d2sm00564f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Functionalized cellulosics have shown promise as naturally derived thermoresponsive gelling agents. However, the dynamics of thermally induced phase transitions of these polymers at the lower critical solution temperature (LCST) are not fully understood. Here, with experiments and theoretical considerations, we address how molecular architecture dictates the mechanisms and dynamics of phase transitions for cellulose ethers. Above the LCST, we show that hydroxypropyl substituents favor the spontaneous formation of liquid droplets, whereas methyl substituents induce fibril formation through diffusive growth. In celluloses which contain both methyl and hydroxypropyl substituents, fibrillation initiates after liquid droplet formation, suppressing the fibril growth to a sub-diffusive rate. Unlike for liquid droplets, the dissolution of fibrils back into the solvated state occurs with significant thermal hysteresis. We tune this hysteresis by altering the content of substituted hydroxypropyl moieties. This work provides a systematic study to decouple competing mechanisms during the phase transition of multi-functionalized macromolecules.
Collapse
Affiliation(s)
- Navid Bizmark
- Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, USA.
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Nicholas J Caggiano
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Jason X Liu
- Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, USA.
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Craig B Arnold
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA
- Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Robert K Prud'homme
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Sujit S Datta
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA
| | - Rodney D Priestley
- Princeton Institute for the Science and Technology of Materials, Princeton University, Princeton, New Jersey 08544, USA.
- Department of Chemical and Biological Engineering, Princeton University, Princeton, New Jersey 08544, USA
| |
Collapse
|
11
|
He J, Peng Z, Yang J, Dai L, Hua Z, Li L. How Does Soy 7 S Globulin Influence the Thermo-responsive Fibration Process of Methylcellulose Chains in Aqueous Solutions? Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
12
|
Nelson AZ, Wang Y, Wang Y, Margotta AS, Sammler RL, Izmitli A, Katz JS, Curtis-Fisk J, Li Y, Ewoldt RH. Gelation under stress: impact of shear flow on the formation and mechanical properties of methylcellulose hydrogels. SOFT MATTER 2022; 18:1554-1565. [PMID: 35107466 DOI: 10.1039/d1sm01711j] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
We demonstrate that small unidirectional applied-stresses during temperature-induced gelation dramatically change the gel temperature and the resulting mechanical properties and structure of aqueous methylcellulose (MC), a material that forms a brittle gel with a fibrillar microstructure at elevated temperatures. Applied stress makes gelation more difficult, evidenced by an increased gelation temperature, and weakens mechanical properties of the hot gel, evidenced by a decreased elastic modulus and decreased apparent failure stress. In extreme cases, formation of a fully percolated polymer network is inhibited and a soft granular yield-stress fluid is formed. We quantify the effects of the applied stress using a filament-based mechanical model to relate the measured properties to the structural features of the fibril network. The dramatic changes in the gel temperature and hot gel properties give more design freedom to processing-dependent rheology, but could be detrimental to coating applications where gravitational stress during gelation is unavoidable.
Collapse
Affiliation(s)
- Arif Z Nelson
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Yilin Wang
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Yushi Wang
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Anthony S Margotta
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | - Robert L Sammler
- Formulation, Automation, and Material Science and Engineering, Corporate R&D, Dow Inc., Midland, MI 48674, USA
| | - Aslin Izmitli
- Home and Personal Care TS&D, Dow Inc., Collegeville, PA 19426, USA
| | - Joshua S Katz
- Pharma Solutions R&D, International Flavors & Fragrances, Wilmington, DE 19803, USA
| | - Jaime Curtis-Fisk
- Formulation, Automation, and Material Science and Engineering, Corporate R&D, Dow Inc., Midland, MI 48674, USA
| | - Yongfu Li
- Analytical Science, Corporate R&D, Dow Inc., Midland, MI 48674, USA
| | - Randy H Ewoldt
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| |
Collapse
|
13
|
Shibata M, Terashima T, Koga T. Micellar Aggregation and Thermogelation of Amphiphilic Random Copolymers in Water Hierarchically Dependent on Chain Length. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
14
|
Coughlin ML, Edmund J, Bates FS, Lodge TP. Temperature Dependence of Chain Conformations and Fibril Formation in Solutions of Poly(N-isopropylacrylamide)-Grafted Methylcellulose. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c02206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- McKenzie L. Coughlin
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Jerrick Edmund
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Frank S. Bates
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P. Lodge
- Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
15
|
Yang X, Gao L, Wei Y, Tan B, Wu Y, Yi C, Liao J. Photothermal hydrogel platform for prevention of post-surgical tumor recurrence and improving breast reconstruction. J Nanobiotechnology 2021; 19:307. [PMID: 34620160 PMCID: PMC8499550 DOI: 10.1186/s12951-021-01041-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Accepted: 09/13/2021] [Indexed: 02/08/2023] Open
Abstract
Background As one of the leading threats for health among women worldwide, breast cancer has high morbidity and mortality. Surgical resection is the major clinical intervention for primary breast tumor, nevertheless high local recurrence risk and breast tissue defect remain two main clinical dilemmas, seriously affecting survival and quality of life of patients. Experimental We developed a thermoresponsive and injectable hybrid hydrogel platform (IR820/Mgel) by integration of co-loaded porous microspheres (MPs) and IR820 for preventing postoperative recurrence of breast cancer via photothermal therapy and promoting subsequent breast reconstruction. Results Our results suggested that IR820/Mgel could quickly heated to more than 50.0 ℃ under NIR irradiation, enabling killing effect on 4T1 cells in vitro and prevention effect on post-surgical tumor recurrence in vivo. In addition, the hydrogel platform was promising for its minimal invasion and capability of filling irregularly shaped defects after surgery, and the encapsulated MPs could help to increase the strength of gel to realize a long-term in situ function in vivo, and promoted the attachment and anchorage property of normal breast cells and adipose stem cells. Conclusions This photothermal hydrogel platform provides a practice paradigm for preventing locally recurrence of breast cancer and a potential option for reconstruction of breast defects. Graphic abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s12951-021-01041-w.
Collapse
Affiliation(s)
- Xi Yang
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Ling Gao
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, 610041, China.,Department of Health Ward, The Affiliated Cancer Hospital of Guangzhou Medical University, Guangzhou, 510095, China
| | - Yuanfeng Wei
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Bowen Tan
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Yongzhi Wu
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China
| | - Cheng Yi
- Department of Medical Oncology, Cancer Center, West China Hospital, Sichuan University, Chengdu, 610041, China
| | - Jinfeng Liao
- State Key Laboratory of Oral Diseases, National Clinical Research Centre for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, 610041, China.
| |
Collapse
|
16
|
Hynninen V, Patrakka J, Nonappa. Methylcellulose-Cellulose Nanocrystal Composites for Optomechanically Tunable Hydrogels and Fibers. MATERIALS (BASEL, SWITZERLAND) 2021; 14:5137. [PMID: 34576360 PMCID: PMC8465715 DOI: 10.3390/ma14185137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/29/2021] [Revised: 08/31/2021] [Accepted: 09/01/2021] [Indexed: 12/18/2022]
Abstract
Chemical modification of cellulose offers routes for structurally and functionally diverse biopolymer derivatives for numerous industrial applications. Among cellulose derivatives, cellulose ethers have found extensive use, such as emulsifiers, in food industries and biotechnology. Methylcellulose, one of the simplest cellulose derivatives, has been utilized for biomedical, construction materials and cell culture applications. Its improved water solubility, thermoresponsive gelation, and the ability to act as a matrix for various dopants also offer routes for cellulose-based functional materials. There has been a renewed interest in understanding the structural, mechanical, and optical properties of methylcellulose and its composites. This review focuses on the recent development in optically and mechanically tunable hydrogels derived from methylcellulose and methylcellulose-cellulose nanocrystal composites. We further discuss the application of the gels for preparing highly ductile and strong fibers. Finally, the emerging application of methylcellulose-based fibers as optical fibers and their application potentials are discussed.
Collapse
Affiliation(s)
- Ville Hynninen
- Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 541, FI-33720 Tampere, Finland;
- Department of Applied Physics, Aalto University, P.O. Box 15100, FI-00076 Espoo, Finland
| | - Jani Patrakka
- Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 541, FI-33720 Tampere, Finland;
| | - Nonappa
- Faculty of Engineering and Natural Sciences, Tampere University, P.O. Box 541, FI-33720 Tampere, Finland;
| |
Collapse
|
17
|
Li J, Li J, Li H, Wang C, Sheng M, Zhang L, Fu S. Bistable Elastic Electrochromic Ionic Gels for Energy-Saving Displays. ACS APPLIED MATERIALS & INTERFACES 2021; 13:27200-27208. [PMID: 34061499 DOI: 10.1021/acsami.1c05768] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The diversification of electrochromic materials greatly expands the application fields of electrochromic devices. However, highly flexible electrochromic materials remain challenging due to the inherent limitations associated with the existing electrochromic processes. Inspired by the hydrogen bonding effect in the hydrogel structure, a highly elastic and bistable electrochromic ionic gel based on a hydrogen bonding cross-linking network is prepared by solution polymerization having excellent tensile resilience, uniform coloring, reversible switching (≤24.3 s), maximum transmittance change (≥80%), bistability (54 h), reversibility (>500 cycles), and coloration efficiency (≥85.3 cm2·C-1). This method has been used to develop bistable electrochromic displays. The unconventional exploration of the bistable design principle may provide a new idea for the realization of bistable electrochromic devices.
Collapse
Affiliation(s)
- Jiashuang Li
- Key Laboratory of Science & Technology of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Jingjing Li
- The First Scientific Research Institute of Wuxi, Wuxi, Jiangsu 214122, China
| | - Hongbin Li
- The First Scientific Research Institute of Wuxi, Wuxi, Jiangsu 214122, China
| | - Chengcheng Wang
- Key Laboratory of Science & Technology of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Mingfei Sheng
- Key Laboratory of Science & Technology of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Liping Zhang
- Key Laboratory of Science & Technology of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| | - Shaohai Fu
- Key Laboratory of Science & Technology of Eco-Textile, Jiangnan University, Ministry of Education, Wuxi, Jiangsu 214122, China
| |
Collapse
|
18
|
Shibata M, Terashima T, Koga T. Thermoresponsive Gelation of Amphiphilic Random Copolymer Micelles in Water. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00406] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Motoki Shibata
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Takaya Terashima
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tsuyoshi Koga
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| |
Collapse
|
19
|
Liberman L, Schmidt PW, Coughlin ML, Ya’akobi AM, Davidovich I, Edmund J, Ertem SP, Morozova S, Talmon Y, Bates FS, Lodge TP. Salt-Dependent Structure in Methylcellulose Fibrillar Gels. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c02429] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lucy Liberman
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Peter W. Schmidt
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - McKenzie L. Coughlin
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Asia Matatyaho Ya’akobi
- Department of Chemical Engineering, and the Russell Berrie Nanotechnology Institute, Technion–Israel Institute of Technology, Haifa 3200003, Israel
| | - Irina Davidovich
- Department of Chemical Engineering, and the Russell Berrie Nanotechnology Institute, Technion–Israel Institute of Technology, Haifa 3200003, Israel
| | - Jerrick Edmund
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - S. Piril Ertem
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Svetlana Morozova
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Department of Macomolecular Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, United States
| | - Yeshayahu Talmon
- Department of Chemical Engineering, and the Russell Berrie Nanotechnology Institute, Technion–Israel Institute of Technology, Haifa 3200003, Israel
| | - Frank S. Bates
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P. Lodge
- Department of Chemical Engineering & Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
20
|
|
21
|
Deng L, Liu Y, Yang L, Yi JZ, Deng F, Zhang LM. Injectable and bioactive methylcellulose hydrogel carrying bone mesenchymal stem cells as a filler for critical-size defects with enhanced bone regeneration. Colloids Surf B Biointerfaces 2020; 194:111159. [DOI: 10.1016/j.colsurfb.2020.111159] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 05/13/2020] [Accepted: 05/26/2020] [Indexed: 12/15/2022]
|
22
|
Lee JY, Song Y, Wessels MG, Jayaraman A, Wooley KL, Pochan DJ. Hierarchical Self-Assembly of Poly(d-glucose carbonate) Amphiphilic Block Copolymers in Mixed Solvents. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01575] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jee Young Lee
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Yue Song
- Departments of Chemistry, Chemical Engineering, and Materials Science & Engineering, Texas A&M University, College Station, Texas 77842, United States
| | - Michiel G. Wessels
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Arthi Jayaraman
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, United States
| | - Karen L. Wooley
- Departments of Chemistry, Chemical Engineering, and Materials Science & Engineering, Texas A&M University, College Station, Texas 77842, United States
| | - Darrin J. Pochan
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, United States
| |
Collapse
|
23
|
Fox RJ, Hegde M, Zanelotti CJ, Kumbhar AS, Samulski ET, Madsen LA, Picken SJ, Dingemans TJ. Irreversible Shear-Activated Gelation of a Liquid Crystalline Polyelectrolyte. ACS Macro Lett 2020; 9:957-963. [PMID: 35648607 DOI: 10.1021/acsmacrolett.0c00168] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report irreversible, shear-activated gelation in liquid crystalline solutions of a rigid polyelectrolyte that forms rodlike assemblies (rods) in salt-free solution. At rest, the liquid crystalline solutions are kinetically stable against gelation and exhibit low viscosities. Under steady shear at, or above, a critical shear rate, a physically cross-linked, nematic gel network forms due to linear growth and branching of the rods. Above a critical shear rate, the time scale of gelation can be tuned from hours to nearly instantaneously by varying the shear rate and solution concentration. The shear-activated gels are distinct in their structure and rheological properties from thermoreversible gels. At a fixed concentration, the induction time prior to gelation decreases exponentially with the shear rate. This result indicates that shear-activated thermalization of the electrostatically stabilized rods overcomes the energy barrier for rod-rod contact, enabling rod fusion and subsequent irreversible network formation.
Collapse
Affiliation(s)
- Ryan J Fox
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
| | - Maruti Hegde
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
| | - Curt J Zanelotti
- Department of Chemistry and Macromolecules Innovation Institute, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States
| | - Amar S Kumbhar
- Chapel Hill Analytical and Nanofabrication Laboratory, University of North Carolina at Chapel Hill, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
| | - Edward T Samulski
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
| | - Louis A Madsen
- Department of Chemistry and Macromolecules Innovation Institute, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24060, United States
| | - Stephen J Picken
- Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Theo J Dingemans
- Department of Applied Physical Sciences, University of North Carolina at Chapel Hill, 121 South Road, Chapel Hill, North Carolina 27599-3050, United States
| |
Collapse
|
24
|
Grason GM. Chiral and achiral mechanisms of self-limiting assembly of twisted bundles. SOFT MATTER 2020; 16:1102-1116. [PMID: 31894228 DOI: 10.1039/c9sm01840a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A generalized theory of the self-limiting assembly of twisted bundles of filaments and columns is presented. Bundles and fibers form in a broad variety of supramolecular systems, from biological to synthetic materials. A widely-invoked mechanism to explain their finite diameter relies on chirality transfer from the molecular constituents to collective twist of the assembly, the effect of which frustrates the lateral assembly and can select equilibrium, finite diameters of bundles. In this article, the thermodynamics of twisted-bundle assembly is analyzed to understand if chirality transfer is necessary for self-limitation, or instead, if spontaneously-twisting, achiral bundles also exhibit self-limited assembly. A generalized description is invoked for the elastic costs imposed by twist for bundles of various states of intra-bundle order from nematic to crystalline, as well as a generic mechanism for generating twist, classified both by chirality but also the twist susceptibility of inter-filament alignment. The theory provides a comprehensive set of predictions for the equilibrium twist and size of bundles as a function of surface energy as well as chirality, twist susceptibility, and elasticity of bundles. Moreover, it shows that while spontaneous twist can lead to self-limitation, assembly of twisted achiral bundles can be distinguished qualitatively in terms of their range of equilibrium sizes and thermodynamic stability relative to bulk (untwisted) states.
Collapse
Affiliation(s)
- Gregory M Grason
- Department of Polymer Science, University of Massachusetts, Amherst, Massachusetts 01003, USA.
| |
Collapse
|
25
|
Hashemi P, Mischnick P. 1,4-D-Glucan block copolymers: synthesis and comprehensive structural characterization. Anal Bioanal Chem 2020; 412:1597-1610. [PMID: 31960080 PMCID: PMC7026270 DOI: 10.1007/s00216-020-02388-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/17/2019] [Accepted: 01/03/2020] [Indexed: 11/28/2022]
Abstract
Multi-block glucans comprising permethylated and partially methylated blocks are compounds of interest. In order to monitor their formation by transglycosylation of corresponding starting glucans, a method has been developed and applied to model compounds. This method allows determining the average length of the blocks and the progress of incorporation of methyl blocks in partially methylated sequences with a random distribution. The method, comprising liquid chromatography mass spectrometry (LC-MS) and electrospray ionization collision-induced dissociation tandem mass spectrometry (ESI-CID-MSn) measurements of two types of peralkylated glucans representing derivatives of the target compounds, is comprehensively described and discussed. ESI-MSn allows looking into the sequences of oligomeric domains. In addition, transglycosylation is followed by attenuated total reflection FTIR and NMR spectroscopy. Graphical abstract ![]()
Collapse
Affiliation(s)
- Payam Hashemi
- Institute of Food Chemistry, Technische Universität Braunschweig, Schleinitzstr. 20, 38106, Braunschweig, Germany
| | - Petra Mischnick
- Institute of Food Chemistry, Technische Universität Braunschweig, Schleinitzstr. 20, 38106, Braunschweig, Germany.
| |
Collapse
|
26
|
Schmidt PW, Morozova S, Ertem SP, Coughlin ML, Davidovich I, Talmon Y, Reineke TM, Bates FS, Lodge TP. Internal Structure of Methylcellulose Fibrils. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b01773] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
| | | | | | | | - Irina Davidovich
- Department of Chemical Engineering, and the Russell Berrie Nanotechnology Institute, Technion—Israel Institute of Technology, Haifa 3200003, Israel
| | - Yeshayahu Talmon
- Department of Chemical Engineering, and the Russell Berrie Nanotechnology Institute, Technion—Israel Institute of Technology, Haifa 3200003, Israel
| | | | | | | |
Collapse
|
27
|
Affiliation(s)
- Svetlana Morozova
- Department of Macromolecular Science and EngineeringCase Western Reserve University Cleveland Ohio USA
| |
Collapse
|
28
|
Morozova S, Coughlin ML, Early JT, Ertem SP, Reineke TM, Bates FS, Lodge TP. Properties of Chemically Cross-Linked Methylcellulose Gels. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b01401] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
29
|
Xu HN, Chu C, Wang L, Zhang L. Droplet clustering in cyclodextrin-based emulsions mediated by methylcellulose. SOFT MATTER 2019; 15:6842-6851. [PMID: 31406969 DOI: 10.1039/c9sm00875f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Rapid droplet aggregation in cyclodextrin (CD)-stabilized emulsions limits their practical use as material templates. Herein, we formulate mixtures of submicron CD-based emulsion droplets suspended in aqueous solutions of methylcellulose (MC) with various concentrations and molecular weights. We evaluate the effects of MC on the microstructure and stability of the emulsions using different techniques including optical microscopy, laser particle analysis, confocal laser scanning microscopy and multiple light scattering, explore the rheological behavior of the emulsions through large amplitude oscillatory shear experiments, and study the viscoelastic nonlinearities of the emulsions as a function of strain and strain-rate space through nondimensional elastic and viscous Lissajous-Bowditch plots. It is demonstrated that the emulsion droplets are present in the form of small clusters and their size is almost independent of MC concentration and molecular weight. The clustering pattern is also supported by the changes in viscoelastic properties of the emulsions and the intracycle nonlinear behavior of the Lissajous-Bowditch plots. We propose for the first time that glass-like dynamic arrest takes place with the formation of small equilibrium droplet clusters in the situation where the CD-based emulsion droplets are forced by depletion flocculation and kinetic trapping simultaneously exerted by MC.
Collapse
Affiliation(s)
- Hua-Neng Xu
- State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi, Jiangsu 214122, People's Republic of China.
| | | | | | | |
Collapse
|
30
|
Yin X, Hewitt DRO, Preston AN, Heroux LA, Agamalian MM, Quah SP, Zheng B, Smith AJ, Laughlin ST, Grubbs RB, Bhatia SR. Hierarchical assembly in PLA-PEO-PLA hydrogels with crystalline domains and effect of block stereochemistry. Colloids Surf B Biointerfaces 2019; 180:102-109. [PMID: 31030021 DOI: 10.1016/j.colsurfb.2019.04.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2018] [Revised: 04/10/2019] [Accepted: 04/13/2019] [Indexed: 01/16/2023]
Abstract
Understanding the development of microstructure (e.g., structures with length scales roughly 0.5-500 μm) in hydrogels is crucial for their use in several biomedical applications. We utilize ultra-small-angle neutron scattering (USANS) and confocal microscopy to explore microstructure of poly(lactide)-poly(ethylene oxide)-poly(lactide) (PLA-PEO-PLA) triblock copolymer hydrogels with varying l/d-lactide ratio. We have previously found that these polymers self-assemble on the nanoscale into micelles. Here, we observe large-scale structures with diverse morphologies, including highly porous self-similar networks with characteristic sizes spanning approximately 120 nm-200 μm. These structural features give rise to power-law scattering indicative of fractal structures in USANS. Mass fractal and surface fractal structures are found for gels with l/d ratios of 80/20 and 50/50, respectively. Confocal microscopy shows microscale water-filled channels and pores that are more clearly evident in gels with a higher fraction of l-lactide in the PLA block as compared to the 50/50 hydrogels. Tuning block stereochemistry may provide a means of controlling the self-assembly and structural evolution at both the nanoscale and microscale, impacting application of these materials in tissue engineering and drug delivery.
Collapse
Affiliation(s)
- Xuechen Yin
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - David R O Hewitt
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Alyssa N Preston
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Luke A Heroux
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Michael M Agamalian
- Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Suan P Quah
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Bingqian Zheng
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Andrew J Smith
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Scott T Laughlin
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Robert B Grubbs
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Surita R Bhatia
- Department of Chemistry, Stony Brook University, Stony Brook, NY, 11794, USA.
| |
Collapse
|
31
|
Isa Ziembowicz F, de Freitas DV, Bender CR, dos Santos Salbego PR, Piccinin Frizzo C, Pinto Martins MA, Reichert JM, Santos Garcia IT, Kloster CL, Villetti MA. Effect of mono- and dicationic ionic liquids on the viscosity and thermogelation of methylcellulose in the semi-diluted regime. Carbohydr Polym 2019; 214:174-185. [DOI: 10.1016/j.carbpol.2019.02.095] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 02/26/2019] [Accepted: 02/27/2019] [Indexed: 11/24/2022]
|
32
|
Hynninen V, Mohammadi P, Wagermaier W, Hietala S, Linder MB, Ikkala O, Nonappa. Methyl cellulose/cellulose nanocrystal nanocomposite fibers with high ductility. Eur Polym J 2019. [DOI: 10.1016/j.eurpolymj.2018.12.035] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
|
33
|
Morozova S, Schmidt PW, Bates FS, Lodge TP. Effect of Poly(ethylene glycol) Grafting Density on Methylcellulose Fibril Formation. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01899] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
|
34
|
Schmidt PW, Morozova S, Owens PM, Adden R, Li Y, Bates FS, Lodge TP. Molecular Weight Dependence of Methylcellulose Fibrillar Networks. Macromolecules 2018. [DOI: 10.1021/acs.macromol.8b01292] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
| | | | | | - Roland Adden
- Dow Pharma
and Food
Solutions, Bomlitz 05161, Germany
| | - Yongfu Li
- Analytical Sciences, The Dow Chemical Company, Midland, Michigan 48667, United States
| | | | | |
Collapse
|
35
|
Hynninen V, Hietala S, McKee JR, Murtomäki L, Rojas OJ, Ikkala O, Nonappa. Inverse Thermoreversible Mechanical Stiffening and Birefringence in a Methylcellulose/Cellulose Nanocrystal Hydrogel. Biomacromolecules 2018; 19:2795-2804. [PMID: 29733648 PMCID: PMC6095634 DOI: 10.1021/acs.biomac.8b00392] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Revised: 05/06/2018] [Indexed: 12/19/2022]
Abstract
We show that composite hydrogels comprising methyl cellulose (MC) and cellulose nanocrystal (CNC) colloidal rods display a reversible and enhanced rheological storage modulus and optical birefringence upon heating, i.e., inverse thermoreversibility. Dynamic rheology, quantitative polarized optical microscopy, isothermal titration calorimetry (ITC), circular dichroism (CD), and scanning and transmission electron microscopy (SEM and TEM) were used for characterization. The concentration of CNCs in aqueous media was varied up to 3.5 wt % (i.e, keeping the concentration below the critical aq concentration) while maintaining the MC aq concentration at 1.0 wt %. At 20 °C, MC/CNC underwent gelation upon passing the CNC concentration of 1.5 wt %. At this point, the storage modulus ( G') reached a plateau, and the birefringence underwent a stepwise increase, thus suggesting a percolative phenomenon. The storage modulus ( G') of the composite gels was an order of magnitude higher at 60 °C compared to that at 20 °C. ITC results suggested that, at 60 °C, the CNC rods were entropically driven to interact with MC chains, which according to recent studies collapse at this temperature into ring-like, colloidal-scale persistent fibrils with hollow cross-sections. Consequently, the tendency of the MC to form more persistent aggregates promotes the interactions between the CNC chiral aggregates towards enhanced storage modulus and birefringence. At room temperature, ITC shows enthalpic binding between CNCs and MC with the latter comprising aqueous, molecularly dispersed polymer chains that lead to looser and less birefringent material. TEM, SEM, and CD indicate CNC chiral fragments within a MC/CNC composite gel. Thus, MC/CNC hybrid networks offer materials with tunable rheological properties and access to liquid crystalline properties at low CNC concentrations.
Collapse
Affiliation(s)
- Ville Hynninen
- Department
of Applied Physics, School of Science, Aalto
University, P.O. Box 15100, FI-00076 Espoo, Finland
| | - Sami Hietala
- Department
of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 HY Helsinki, Finland
| | | | - Lasse Murtomäki
- Departments
of Chemical and Metallurgical Engineering and Chemistry and Materials
Science, School of Chemical Engineering, Aalto University, P.O. Box 16300, FI-00076 Espoo, Finland
| | - Orlando J. Rojas
- Department
of Applied Physics, School of Science, Aalto
University, P.O. Box 15100, FI-00076 Espoo, Finland
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O.
Box 16300, FI-00076 Espoo, Finland
| | - Olli Ikkala
- Department
of Applied Physics, School of Science, Aalto
University, P.O. Box 15100, FI-00076 Espoo, Finland
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O.
Box 16300, FI-00076 Espoo, Finland
| | - Nonappa
- Department
of Applied Physics, School of Science, Aalto
University, P.O. Box 15100, FI-00076 Espoo, Finland
- Department
of Bioproducts and Biosystems, School of Chemical Engineering, Aalto University, P.O.
Box 16300, FI-00076 Espoo, Finland
| |
Collapse
|
36
|
Vargas-Lara F, Douglas JF. Fiber Network Formation in Semi-Flexible Polymer Solutions: An Exploratory Computational Study. Gels 2018; 4:E27. [PMID: 30674803 PMCID: PMC6209269 DOI: 10.3390/gels4020027] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2018] [Revised: 03/13/2018] [Accepted: 03/14/2018] [Indexed: 11/16/2022] Open
Abstract
The formation of gels through the bundling of semi-flexible polymer chains into fiber networks is ubiquitous in diverse manufactured and natural materials, and, accordingly, we perform exploratory molecular dynamics simulations of a coarse-grained model of semi-flexible polymers in a solution with attractive lateral interchain interactions to understand essential features of this type of gel formation. After showing that our model gives rise to fibrous gels resembling real gels of this kind, we investigate how the extent of fiber bundling influences the "melting" temperature, T m , and the emergent rigidification of model bundled fibers having a fixed number of chains, N, within them. Based on our preliminary observations, we suggest the fiber size is kinetically selected by a reduced thermodynamic driving force and a slowing of the dynamics within the fibers associated with their progressive rigidification with the inclusion of an increasing number of chains in the bundle.
Collapse
Affiliation(s)
- Fernando Vargas-Lara
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| | - Jack F Douglas
- Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
| |
Collapse
|
37
|
Morozova S, Schmidt PW, Metaxas A, Bates FS, Lodge TP, Dutcher CS. Extensional Flow Behavior of Methylcellulose Solutions Containing Fibrils. ACS Macro Lett 2018; 7:347-352. [PMID: 35632910 DOI: 10.1021/acsmacrolett.8b00042] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The extensional properties of semidilute aqueous methylcellulose (MC) solutions have been characterized. Pure aqueous MC solutions are shear-thinning liquids at room temperature. With the addition of 8 wt % NaCl, a fraction of MC self-assembles into long fibrils, which modify the rheological properties of the original MC solution. Capillary Breakup Extensional Rheometry (CaBER) was used to characterize salt-free and 8 wt % NaCl solutions of MC at room temperature. The salt-free solutions exhibit only power-law behavior whereas solutions with NaCl exhibit both power-law and elastic regimes. As MC concentration increases, the extensional relaxation time also increases strongly, from 0.04 s at 0.5 wt % to 4 s at 1 wt %. In addition, the apparent extensional viscosity rapidly increases as a function of increasing MC concentration, from 40 Pa·s at 0.5 wt % to 1300 Pa·s at 1 wt %. This behavior is attributed to the presence of fibrils in the MC solutions containing NaCl.
Collapse
|
38
|
Lodge TP, Maxwell AL, Lott JR, Schmidt PW, McAllister JW, Morozova S, Bates FS, Li Y, Sammler RL. Gelation, Phase Separation, and Fibril Formation in Aqueous Hydroxypropylmethylcellulose Solutions. Biomacromolecules 2018; 19:816-824. [PMID: 29489329 DOI: 10.1021/acs.biomac.7b01611] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The thermoresponsive behavior of a hydroxypropylmethylcellulose (HPMC) sample in aqueous solutions has been studied by a powerful combination of characterization tools, including rheology, turbidimetry, cryogenic transmission electron microscopy (cryoTEM), light scattering, small-angle neutron scattering (SANS), and small-angle X-ray scattering (SAXS). Consistent with prior literature, solutions with concentrations ranging from 0.3 to 3 wt % exhibit a sharp drop in the dynamic viscoelastic moduli G' and G″ upon heating near 57 °C. The drop in moduli is accompanied by an abrupt increase in turbidity. All the evidence is consistent with this corresponding to liquid-liquid phase separation, leading to polymer-rich droplets in a polymer-depleted matrix. Upon further heating, the moduli increase, and G' exceeds G″, corresponding to gelation. CryoTEM in dilute solutions reveals that HPMC forms fibrils at the same temperature range where the moduli increase. SANS and SAXS confirm the appearance of fibrils over a range of concentration, and that their average diameter is ca. 18 nm; thus gelation is attributable to formation of a sample-spanning network of fibrils. These results are compared in detail with the closely related and well-studied methylcellulose (MC). The HPMC fibrils are generally shorter, more flexible, and contain more water than with MC, and the resulting gel at high temperatures has a much lower modulus. In addition to the differences in fibril structure, the key distinction between HPMC and MC is that the former undergoes liquid-liquid phase separation prior to forming fibrils and associated gelation, whereas the latter forms fibrils first. These results and their interpretation are compared with the prior literature, in light of the relatively recent discovery of the propensity of MC and HPMC to self-assemble into fibrils on heating.
Collapse
|
39
|
Effect of polymer concentration and thermal history on the inverse thermogelation of hydroxypropylcellulose aqueous solutions. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.10.066] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
40
|
Morozova S, Lodge TP. Conformation of Methylcellulose as a Function of Poly(ethylene glycol) Graft Density. ACS Macro Lett 2017; 6:1274-1279. [PMID: 35650781 DOI: 10.1021/acsmacrolett.7b00776] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Low molecular weight thiol-terminated poly(ethylene glycol) (PEG) (M ≈ 800) has been grafted onto a high molecular weight methylcellulose (MC, Mw ≈ 150000) by a facile thiol-ene click reaction; graft densities varied from 0.7% to 33% (grafts per anhydroglucose unit). Static and dynamic light scattering reveals that the overall radius of the chain increases systematically with graft density, in a manner in excellent agreement with theory. As the contour length remains unchanged, it is apparent that grafting leads to an increase in the persistence length of this semiflexible copolymer, by as much as a factor of 4. These results represent the first experimental verification of the excluded volume theory at low grafting densities, and demonstrate a promising synthetic platform for systematically increasing the persistence length of a model semiflexible, water-soluble polymer.
Collapse
Affiliation(s)
- Svetlana Morozova
- Department of Chemistry and ‡Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy P. Lodge
- Department of Chemistry and ‡Department of Chemical Engineering and Material Science, University of Minnesota, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
41
|
Vidyasagar A, Ku SH, Kim M, Kim M, Lee HS, Pearce TR, McCormick AV, Bates FS, Kokkoli E. Design and Characterization of a PVLA-PEG-PVLA Thermosensitive and Biodegradable Hydrogel. ACS Macro Lett 2017; 6:1134-1139. [PMID: 35650931 DOI: 10.1021/acsmacrolett.7b00523] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A set of poly(δ-valerolactone-co-d,l-lactide)-b-poly(ethylene glycol)-b-poly(δ-valerolactone-co-d,l-lactide) (PVLA-PEG-PVLA) triblock copolymers was synthesized and the solution properties were characterized using rheology, cryo-TEM, cryo-SEM, SANS, and degradation studies. This polymer self-assembles into a low viscosity fluid with flowerlike spherical micelles in water at room temperature and transforms into a wormlike morphology upon heating, accompanied by gelation. At even higher temperatures syneresis is observed. At physiological temperature (37 °C) the hydrogel's average pore size is around 600 nm. The PVLA-PEG-PVLA gel degrades in about 45 days in cell media, making this unique hydrogel a promising candidate for biomedical applications.
Collapse
Affiliation(s)
- Ajay Vidyasagar
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Sook Hee Ku
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Minchul Kim
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Mihee Kim
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Han Seung Lee
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Timothy R. Pearce
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Alon V. McCormick
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Frank S. Bates
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Efrosini Kokkoli
- Department
of Chemical Engineering and Materials Science and ∥Department of
Biomedical Engineering, University of Minnesota, Minneapolis, Minnesota 55455, United States
| |
Collapse
|
42
|
Affiliation(s)
- Kengo Arai
- Department
of Symbiotic Science of Environment and Natural Resources,
The United Graduate School of Agriculture, and ‡Division of Natural Resources and
Eco-materials, Graduate School of Agriculture Science, Tokyo University of Agriculture and Technology, 3-5-8
Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| | - Toshiyuki Shikata
- Department
of Symbiotic Science of Environment and Natural Resources,
The United Graduate School of Agriculture, and ‡Division of Natural Resources and
Eco-materials, Graduate School of Agriculture Science, Tokyo University of Agriculture and Technology, 3-5-8
Saiwai-cho, Fuchu, Tokyo 183-8509, Japan
| |
Collapse
|
43
|
Thompson BR, Horozov TS, Stoyanov SD, Paunov VN. An ultra melt-resistant hydrogel from food grade carbohydrates. RSC Adv 2017. [DOI: 10.1039/c7ra08590g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We have formulated an ultra melt-resistant composite hydrogel with tailorable rheology over a range of temperatures.
Collapse
Affiliation(s)
| | - Tommy S. Horozov
- School of Mathematics and Physical Sciences (Chemistry)
- University of Hull
- Hull
- UK
| | - Simeon D. Stoyanov
- Unilever R&D Vlaardingen
- 3133 AT Vlaardingen
- The Netherlands
- Laboratory of Physical Chemistry and Soft Matter
- Wageningen University
| | - Vesselin N. Paunov
- School of Mathematics and Physical Sciences (Chemistry)
- University of Hull
- Hull
- UK
| |
Collapse
|
44
|
Hu Z, Xu R, Cranston ED, Pelton RH. Stable Aqueous Foams from Cellulose Nanocrystals and Methyl Cellulose. Biomacromolecules 2016; 17:4095-4099. [PMID: 27936719 DOI: 10.1021/acs.biomac.6b01641] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhen Hu
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada
| | - Richard Xu
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada
| | - Emily D. Cranston
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada
| | - Robert H. Pelton
- Department of Chemical Engineering, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada
| |
Collapse
|
45
|
Park W, Park SJ, Cho S, Shin H, Jung YS, Lee B, Na K, Kim DH. Intermolecular Structural Change for Thermoswitchable Polymeric Photosensitizer. J Am Chem Soc 2016; 138:10734-7. [PMID: 27535204 DOI: 10.1021/jacs.6b04875] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We developed a thermoswitchable polymeric photosensitizer (T-PPS) by conjugating PS (Pheophorbide-a, PPb-a) to a temperature-responsive polymer backbone of biocompatible hydroxypropyl cellulose. Self-quenched PS molecules linked in close proximity by π-π stacking in T-PPS were easily transited to an active monomeric state by the temperature-induced phase transition of polymer backbones. The temperature-responsive intermolecular interaction changes of PS molecules in T-PPS were demonstrated in synchrotron small-angle X-ray scattering and UV-vis spectrophotometer analysis. The T-PPS allowed switchable activation and synergistically enhanced cancer cell killing effect at the hyperthermia temperature (45 °C). Our developed T-PPS has the considerable potential not only as a new class of photomedicine in clinics but also as a biosensor based on temperature responsiveness.
Collapse
Affiliation(s)
| | - Sin-Jung Park
- Center for Photomedicine, Department of Biotechnology, The Catholic University of Korea , Bucheon-si, Gyeonggi-do 14662, Republic of Korea
| | | | - Heejun Shin
- Center for Photomedicine, Department of Biotechnology, The Catholic University of Korea , Bucheon-si, Gyeonggi-do 14662, Republic of Korea
| | - Young-Seok Jung
- Center for Photomedicine, Department of Biotechnology, The Catholic University of Korea , Bucheon-si, Gyeonggi-do 14662, Republic of Korea
| | - Byeongdu Lee
- X-ray Science Division, Argonne National Laboratory , Argonne, Illinois 60439, United States
| | - Kun Na
- Center for Photomedicine, Department of Biotechnology, The Catholic University of Korea , Bucheon-si, Gyeonggi-do 14662, Republic of Korea
| | | |
Collapse
|
46
|
Jaspers M, Pape ACH, Voets IK, Rowan AE, Portale G, Kouwer PHJ. Bundle Formation in Biomimetic Hydrogels. Biomacromolecules 2016; 17:2642-9. [DOI: 10.1021/acs.biomac.6b00703] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Maarten Jaspers
- Radboud University, Institute for Molecules and
Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands
| | - A. C. H. Pape
- Eindhoven University of Technology, Laboratory for
Macromolecular and Organic Chemistry, and Laboratory of Physical Chemistry,
and Institute for Complex Molecular Systems, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Ilja K. Voets
- Eindhoven University of Technology, Laboratory for
Macromolecular and Organic Chemistry, and Laboratory of Physical Chemistry,
and Institute for Complex Molecular Systems, P.O. Box 513, 5600 MB Eindhoven, The Netherlands
| | - Alan E. Rowan
- Radboud University, Institute for Molecules and
Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands
- The University of Queensland, Australian Institute
for Bioengineering and Nanotechnology, Brisbane, Queensland 4072, Australia
| | - Giuseppe Portale
- Netherlands Organisation for Scientific Research (NWO), DUBBLE CRG at the ESRF, 6 rue Jules Horowitz, 38043 Grenoble Cedex, France
- University of Groningen, Department of Macromolecular
Chemistry and New Polymeric Materials, Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Paul H. J. Kouwer
- Radboud University, Institute for Molecules and
Materials, Heyendaalseweg
135, 6525 AJ Nijmegen, The Netherlands
| |
Collapse
|
47
|
Mantravadi R, Chinnam PR, Dikin DA, Wunder SL. High Conductivity, High Strength Solid Electrolytes Formed by in Situ Encapsulation of Ionic Liquids in Nanofibrillar Methyl Cellulose Networks. ACS APPLIED MATERIALS & INTERFACES 2016; 8:13426-13436. [PMID: 27153318 DOI: 10.1021/acsami.6b02903] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Strong, solid polymer electrolyte ion gels, with moduli in the MPa range, a capacitance of 2 μF/cm(2), and high ambient ionic conductivities (>1 × 10(-3) S/cm), all at room temperature, have been prepared from butyl-N-methyl pyrrolidinium bis(trifluoromethylsulfonyl) imide (PYR14TFSI) and methyl cellulose (MC). These properties are particularly attractive for supercapacitor applications. The ion gels are prepared by codissolution of PYR14TFSI and MC in N,N-dimethylformamide (DMF), which after heating and subsequent cooling form a gel. Evaporation of DMF leave thin, flexible, self-standing ion gels with up to 97 wt % PYR14TFSI, which have the highest combined moduli and ionic conductivity of ion gels to date, with an excellent electrochemical stability window (5.6 V). These favorable properties are attributed to the immiscibility of PYR14TFSI in MC, which permits the ionic conductivity to be independent of the MC at low MC content, and the in situ formation of a volume spanning network of semicrystalline MC nanofibers, which have a high glass transition temperature (Tg = 190 °C) and remain crystalline until they degrade at 300 °C.
Collapse
Affiliation(s)
- Ramya Mantravadi
- Department of Chemistry and ‡Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States
| | - Parameswara Rao Chinnam
- Department of Chemistry and ‡Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States
| | - Dmitriy A Dikin
- Department of Chemistry and ‡Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States
| | - Stephanie L Wunder
- Department of Chemistry and ‡Department of Mechanical Engineering, Temple University , Philadelphia, Pennsylvania 19122, United States
| |
Collapse
|
48
|
Ginzburg VV, Sammler RL, Huang W, Larson RG. Anisotropic self-assembly and gelation in aqueous methylcellulose-theory and modeling. ACTA ACUST UNITED AC 2016. [DOI: 10.1002/polb.24065] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Valeriy V. Ginzburg
- The Dow Chemical Company, Core R&D, Materials Science; Midland Michigan 48674
| | - Robert L. Sammler
- The Dow Chemical Company, Core R&D, Materials Science; Midland Michigan 48674
| | - Wenjun Huang
- Department of Chemical Engineering; University of Michigan; Ann Arbor Michigan 48109
| | - Ronald G. Larson
- Department of Chemical Engineering; University of Michigan; Ann Arbor Michigan 48109
| |
Collapse
|
49
|
Quennouz N, Hashmi SM, Choi HS, Kim JW, Osuji CO. Rheology of cellulose nanofibrils in the presence of surfactants. SOFT MATTER 2016; 12:157-164. [PMID: 26466557 DOI: 10.1039/c5sm01803j] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Cellulose nanofibrils (CNFs) present unique opportunities for rheology modification in complex fluids. Here we systematically consider the effect of ionic and non-ionic surfactants on the rheology of dilute CNF suspensions. Neat suspensions are transparent yield-stress fluids which display strong shear thinning and power-law dependence of modulus on concentration, G' ∼ c(2.1). Surfactant addition below a critical mass concentration cc produces an increase in the gel modulus with retention of optical clarity. Larger than critical concentrations induce significant fibril aggregation leading to the loss of suspension stability and optical clarity, and to aggregate sedimentation. The critical concentration was the lowest for a cationic surfactant (DTAB), cc ≈ 0.08%, while suspension stability was retained for non-ionic surfactants (Pluronic F68, TX100) at concentrations up to 8%. The anionic surfactant SDS led to a loss of stability at cc ≈ 1.6% whereas suspension stability was not compromised by anionic SLES up to 8%. Dynamic light scattering data are consistent with a scenario in which gel formation is driven by micelle-nanofibril bridging mediated by associative interactions of ethoxylated surfactant headgroups with the cellulose fibrils. This may explain the strong difference between the properties of SDS and SLES-modified suspensions. These results have implications for the use of CNFs as a rheology modifier in surfactant-containing systems.
Collapse
Affiliation(s)
- Nawal Quennouz
- Department of Chemical and Environmental Engineering, Yale University, New Haven CT 06511, USA.
| | - Sara M Hashmi
- Department of Chemical and Environmental Engineering, Yale University, New Haven CT 06511, USA.
| | - Hong Sung Choi
- Shinsegae International Co. Ltd, Seoul, 135-954, Republic of Korea
| | - Jin Woong Kim
- Department of Applied Chemistry, Hanyang University, Ansan, 426-791, Republic of Korea and Department of Biono Technology, Hanyang University, Ansan, 426-791, Republic of Korea
| | - Chinedum O Osuji
- Department of Chemical and Environmental Engineering, Yale University, New Haven CT 06511, USA.
| |
Collapse
|
50
|
Diffusion of water from a range of conservation treatment gels into paint films studied by unilateral NMR. Microchem J 2016. [DOI: 10.1016/j.microc.2015.09.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|