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Sangitra SN, Pujala RK. Effect of small amounts of akaganeite (β-FeOOH) nanorods on the gelation, phase behaviour and injectability of thermoresponsive Pluronic F127. SOFT MATTER 2023; 19:5869-5879. [PMID: 37401782 DOI: 10.1039/d3sm00451a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/05/2023]
Abstract
Pluronic F127 (PF127) is a copolymer with an amphiphilic nature and can self-assemble to form micelles and, beyond 20% (w/v), form a thermoresponsive physical gel state. However, they are mechanically weak and easily dissolve in physiological environments, which limits their use in load-bearing in specific biomedical applications. Therefore, we propose a pluronic-based hydrogel with enhanced stability by incorporating small amounts of paramagnetic nanorods, akaganeite (β-FeOOH) nanorods (NRs) of aspect ratio ∼7, with PF127. Due to their weak magnetic properties, β-FeOOH NRs have been used as a precursor for preparing stable iron-oxide states (e.g., hematite and magnetite), and the studies on β-FeOOH NRs to be used as a primary component in hydrogels are at the nascent stage. Here we report a method to synthesize β-FeOOH NRs on a gram scale using a simple sol-gel process and characterize the NRs with various techniques. A phase diagram and thermoresponsive behaviour based on rheological experiments and visual observations are proposed for 20% (w/v) PF127 with low concentrations (0.1-1.0% (w/v)) of β-FeOOH NRs. We observe a unique non-monotonous behaviour in the gel network represented by various rheological parameters like storage modulus, yield stress, fragility, high-frequency modulus plateau, and characteristic relaxation time as a function of nanorod concentration. A plausible physical mechanism is proposed to fundamentally understand the observed phase behaviour in the composite gels. These gels show thermoresponsiveness and enhanced injectability, and could find applications in tissue engineering and drug delivery.
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Affiliation(s)
- Surya Narayana Sangitra
- Soft and Active Matter group, Department of Physics, Indian Institute of Science Education and Research (IISER), Tirupati, Andhra Pradesh, 517507, India.
| | - Ravi Kumar Pujala
- Soft and Active Matter group, Department of Physics, Indian Institute of Science Education and Research (IISER), Tirupati, Andhra Pradesh, 517507, India.
- Centre for Atomic, Molecular and Optical Sciences & Technologies (CAMOST), Indian Institute of Science Education and Research (IISER) Tirupati, Tirupati, Andhra Pradesh, 517507, India
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2
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Du D, Liu Z, Niu W, Weng D, Lim TC, Kurisawa M, Spector M. An Injectable Multifunctional Dual-Phase Bead-Reinforced Gelatin Matrix Permissive of Mesenchymal Stem Cell Infiltration for Musculoskeletal Soft Tissue Repair. Adv Healthc Mater 2021; 10:e2100626. [PMID: 34263563 DOI: 10.1002/adhm.202100626] [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: 03/31/2021] [Revised: 05/27/2021] [Indexed: 11/06/2022]
Abstract
This study develops a novel strategy for regenerative therapy of musculoskeletal soft tissue defects using a dual-phase multifunctional injectable gelatin-hydroxyphenyl propionic acid (Gtn-HPA) composite. The dual-phase gel consists of stiff, degradation-resistant, ≈2-mm diameter spherical beads made from 8 wt% Gtn-HPA in a 2 wt% Gtn-HPA matrix. The results of a 3D migration assay show that both the cell number and migration distance in the dual-phase gel system are comparable with the 2 wt% mono-phase Gtn-HPA, but notably significantly higher than for 8 wt% mono-phase Gtn-HPA (into which few cells migrated). The results also show that the dual phase gel system has degradation resistance and a prolonged growth factor release profile comparable with 8 wt% mono-phase Gtn-HPA. In addition, the compressive modulus of the 2 wt% dual-phase gel system incorporating the 8 wt% bead phase is nearly four-fold higher than the 2 wt% mono-phase gel (5.3 ± 0.4 kPa versus 1.5 ± 0.06 kPa). This novel injectable dual-phase Gtn-HPA composite thus combines the advantages of low-concentration Gtn-HPA (cell migration) with high-concentration Gtn-HPA (stiffness, degradation resistance, slower chemical release kinetics) to facilitate effective reparative/regenerative processes in musculoskeletal soft tissue.
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Affiliation(s)
- Dajiang Du
- Department of Orthopedic Surgery Shanghai Jiao Tong University Affiliated Sixth People's Hospital Shanghai 200233 China
- Sino‐Russian Institute of Hard Tissue Development and Regeneration Harbin Medical University Harbin 150086 China
| | - Zhen Liu
- Tissue Engineering VA Boston Healthcare System Boston MA 02130 USA
| | - Wanting Niu
- Department of Orthopedics Brigham and Women's Hospital Harvard Medical School Boston MA 02115 USA
| | - Ding Weng
- State Key Laboratory of Tribology Department of Mechanical Engineering Tsinghua University Beijing 100084 China
| | - Teck Chuan Lim
- Department of Orthopedics Brigham and Women's Hospital Harvard Medical School Boston MA 02115 USA
| | - Motoichi Kurisawa
- Institute of Bioengineering and Nanotechnology Singapore 138669 Singapore
| | - Myron Spector
- Tissue Engineering VA Boston Healthcare System Boston MA 02130 USA
- Department of Orthopedics Brigham and Women's Hospital Harvard Medical School Boston MA 02115 USA
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3
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Orafa Z, Irani S, Zamanian A, Bakhshi H, Nikukar H, Ghalandari B. Coating of Laponite on PLA Nanofibrous for Bone Tissue Engineering Application. Macromol Res 2021. [DOI: 10.1007/s13233-021-9028-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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4
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Jangizehi A, Schmid F, Besenius P, Kremer K, Seiffert S. Defects and defect engineering in Soft Matter. SOFT MATTER 2020; 16:10809-10859. [PMID: 33306078 DOI: 10.1039/d0sm01371d] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Soft matter covers a wide range of materials based on linear or branched polymers, gels and rubbers, amphiphilic (macro)molecules, colloids, and self-assembled structures. These materials have applications in various industries, all highly important for our daily life, and they control all biological functions; therefore, controlling and tailoring their properties is crucial. One way to approach this target is defect engineering, which aims to control defects in the material's structure, and/or to purposely add defects into it to trigger specific functions. While this approach has been a striking success story in crystalline inorganic hard matter, both for mechanical and electronic properties, and has also been applied to organic hard materials, defect engineering is rarely used in soft matter design. In this review, we present a survey on investigations on defects and/or defect engineering in nine classes of soft matter composed of liquid crystals, colloids, linear polymers with moderate degree of branching, hyperbranched polymers and dendrimers, conjugated polymers, polymeric networks, self-assembled amphiphiles and proteins, block copolymers and supramolecular polymers. This overview proposes a promising role of this approach for tuning the properties of soft matter.
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Affiliation(s)
- Amir Jangizehi
- Johannes Gutenberg University Mainz, Department of Chemistry, Duesbergweg 10-14, D-55128 Mainz, Germany
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5
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Ojha J, Nanda R, Dorai K. NMR investigation of the thermogelling properties, anomalous diffusion, and structural changes in a Pluronic F127 triblock copolymer in the presence of gold nanoparticles. Colloid Polym Sci 2020. [DOI: 10.1007/s00396-020-04740-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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6
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Rheological, Microstructural and Thermal Properties of Magnetic Poly(Ethylene Oxide)/Iron Oxide Nanocomposite Hydrogels Synthesized Using a One-Step Gamma-Irradiation Method. NANOMATERIALS 2020; 10:nano10091823. [PMID: 32932706 PMCID: PMC7559070 DOI: 10.3390/nano10091823] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/02/2020] [Accepted: 09/10/2020] [Indexed: 11/27/2022]
Abstract
Magnetic polymer gels are a new promising class of nanocomposite gels. In this work, magnetic PEO/iron oxide nanocomposite hydrogels were synthesized using the one-step γ-irradiation method starting from poly(ethylene oxide) (PEO) and iron(III) precursor alkaline aqueous suspensions followed by simultaneous crosslinking of PEO chains and reduction of Fe(III) precursor. γ-irradiation dose and concentrations of Fe3+, 2-propanol and PEO in the initial suspensions were varied and optimized. With 2-propanol and at high doses magnetic gels with embedded magnetite nanoparticles were obtained, as confirmed by XRD, SEM and Mössbauer spectrometry. The quantitative determination of γ-irradiation generated Fe2+ was performed using the 1,10-phenanthroline method. The maximal Fe2+ molar fraction of 0.55 was achieved at 300 kGy, pH = 12 and initial 5% of Fe3+. The DSC and rheological measurements confirmed the formation of a well-structured network. The thermal and rheological properties of gels depended on the dose, PEO concentration and initial Fe3+ content (amount of nanoparticles synthesized inside gels). More amorphous and stronger gels were formed at higher dose and higher nanoparticle content. The properties of synthesized gels were determined by the presence of magnetic iron oxide nanoparticles, which acted as reinforcing agents and additional crosslinkers of PEO chains thus facilitating the one-step gel formation.
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7
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Hybrid Complex Coacervate. Polymers (Basel) 2020; 12:polym12020320. [PMID: 32033133 PMCID: PMC7077495 DOI: 10.3390/polym12020320] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 01/14/2020] [Accepted: 01/22/2020] [Indexed: 12/13/2022] Open
Abstract
Underwater adhesion represents a huge technological challenge as the presence of water compromises the performance of most commercially available adhesives. Inspired by natural organisms, we have designed an adhesive based on complex coacervation, a liquid–liquid phase separation phenomenon. A complex coacervate adhesive is formed by mixing oppositely charged polyelectrolytes bearing pendant thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) chains. The material fully sets underwater due to a change in the environmental conditions, namely temperature and ionic strength. In this work, we incorporate silica nanoparticles forming a hybrid complex coacervate and investigate the resulting mechanical properties. An enhancement of the mechanical properties is observed below the PNIPAM lower critical solution temperature (LCST): this is due to the formation of PNIPAM–silica junctions, which, after setting, contribute to a moderate increase in the moduli and in the adhesive properties only when applying an ionic strength gradient. By contrast, when raising the temperature above the LCST, the mechanical properties are dominated by the association of PNIPAM chains and the nanofiller incorporation leads to an increased heterogeneity with the formation of fracture planes at the interface between areas of different concentrations of nanoparticles, promoting earlier failure of the network—an unexpected and noteworthy consequence of this hybrid system.
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8
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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.
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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.
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Li X, Rombouts W, van der Gucht J, de Vries R, Dijksman JA. Mechanics of composite hydrogels approaching phase separation. PLoS One 2019; 14:e0211059. [PMID: 30682112 PMCID: PMC6347237 DOI: 10.1371/journal.pone.0211059] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 01/07/2019] [Indexed: 12/14/2022] Open
Abstract
For polymer-particle composites, limited thermodynamic compatibility of polymers and particles often leads to poor dispersal and agglomeration of the particles in the matrix, which negatively impacts the mechanics of composites. To study the impact of particle compatibility in polymer matrices on the mechanical properties of composites, we here study composite silica- protein based hydrogels. The polymer used is a previously studied telechelic protein-based polymer with end groups that form triple helices, and the particles are silica nanoparticles that only weakly associate with the polymer matrix. At 1mM protein polymer, up to 7% of silica nanoparticles can be embedded in the hydrogel. At higher concentrations the system phase separates. Oscillatory rheology shows that at high frequencies the particles strengthen the gels by acting as short-lived multivalent cross-links, while at low frequencies, the particles reduce the gel strength, presumably by sequestering part of the protein polymers in such a way that they can no longer contribute to the network strength. As is generally observed for polymer/particle composites, shear-induced polymer desorption from the particles leads to a viscous dissipation that strongly increases with increasing particle concentration. While linear rheological properties as function of particle concentration provide no signals for an approaching phase separation, this is very different for the non-linear rheology, especially fracture. Strain-at-break decreases rapidly with increasing particle concentration and vanishes as the phase boundary is approached, suggesting that the interfaces between regions of high and low particle densities in composites close to phase separation provide easy fracture planes.
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Affiliation(s)
- Xiufeng Li
- Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, 6708WE Wageningen, the Netherlands
| | - Wolf Rombouts
- Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, 6708WE Wageningen, the Netherlands
| | - Jasper van der Gucht
- Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, 6708WE Wageningen, the Netherlands
| | - Renko de Vries
- Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, 6708WE Wageningen, the Netherlands
| | - Joshua A. Dijksman
- Physical Chemistry and Soft Matter, Wageningen University and Research, Stippeneng 4, 6708WE Wageningen, the Netherlands
- * E-mail:
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Radosavljević A, Spasojević J, Krstić J, Kačarević-Popović Z. Nanocomposite Hydrogels Obtained by Gamma Irradiation. POLYMERS AND POLYMERIC COMPOSITES: A REFERENCE SERIES 2019. [DOI: 10.1007/978-3-319-77830-3_21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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11
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Boyer C, Figueiredo L, Pace R, Lesoeur J, Rouillon T, Visage CL, Tassin JF, Weiss P, Guicheux J, Rethore G. Laponite nanoparticle-associated silated hydroxypropylmethyl cellulose as an injectable reinforced interpenetrating network hydrogel for cartilage tissue engineering. Acta Biomater 2018; 65:112-122. [PMID: 29128532 DOI: 10.1016/j.actbio.2017.11.027] [Citation(s) in RCA: 90] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Revised: 10/20/2017] [Accepted: 11/07/2017] [Indexed: 11/26/2022]
Abstract
Articular cartilage is a connective tissue which does not spontaneously heal. To address this issue, biomaterial-assisted cell therapy has been researched with promising advances. The lack of strong mechanical properties is still a concern despite significant progress in three-dimensional scaffolds. This article's objective was to develop a composite hydrogel using a small amount of nano-reinforcement clay known as laponites. These laponites were capable of self-setting within the gel structure of the silated hydroxypropylmethyl cellulose (Si-HPMC) hydrogel. Laponites (XLG) were mixed with Si-HPMC to prepare composite hydrogels leading to the development of a hybrid interpenetrating network. This interpenetrating network increases the mechanical properties of the hydrogel. The in vitro investigations showed no side effects from the XLG regarding cytocompatibility or oxygen diffusion within the composite after cross-linking. The ability of the hybrid scaffold containing the composite hydrogel and chondrogenic cells to form a cartilaginous tissue in vivo was investigated during a 6-week implantation in subcutaneous pockets of nude mice. Histological analysis of the composite constructs revealed the formation of a cartilage-like tissue with an extracellular matrix containing glycosaminoglycans and collagens. Overall, this new hybrid construct demonstrates an interpenetrating network which enhances the hydrogel mechanical properties without interfering with its cytocompatibility, oxygen diffusion, or the ability of chondrogenic cells to self-organize in the cluster and produce extracellular matrix components. This composite hydrogel may be of relevance for the treatment of cartilage defects in a large animal model of articular cartilage defects. STATEMENT OF SIGNIFICANCE Articular cartilage is a tissue that fails to heal spontaneously. To address this clinically relevant issue, biomaterial-assisted cell therapy is considered promising but often lacks adequate mechanical properties. Our objective was to develop a composite hydrogel using a small amount of nano reinforcement (laponite) capable of gelling within polysaccharide based self-crosslinking hydrogel. This new hybrid construct demonstrates an interpenetrating network (IPN) which enhances the hydrogel mechanical properties without interfering with its cytocompatibility, O2 diffusion and the ability of chondrogenic cells to self-organize in cluster and produce extracellular matrix components. This composite hydrogel may be of relevance for the treatment of cartilage defects and will now be considered in a large animal model of articular cartilage defects.
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Miyazaki M, Maeda T, Hirashima K, Kurokawa N, Nagahama K, Hotta A. PEG-based nanocomposite hydrogel: Thermoresponsive sol-gel transition controlled by PLGA-PEG-PLGA molecular weight and solute concentration. POLYMER 2017. [DOI: 10.1016/j.polymer.2017.03.016] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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13
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Sun J, Lei Y, Dai Z, Liu X, Huang T, Wu J, Xu ZP, Sun X. Sustained Release of Brimonidine from a New Composite Drug Delivery System for Treatment of Glaucoma. ACS APPLIED MATERIALS & INTERFACES 2017; 9:7990-7999. [PMID: 28198606 DOI: 10.1021/acsami.6b16509] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
A novel layered double hydroxide (LDH) nanoparticle/thermogel composite drug delivery system (DDS) for sustained release of brimonidine (Bri) has been designed, prepared, and characterized in this study for treatment of severe glaucoma. Brimonidine is first loaded onto LDH (Bri@LDH) nanoparticles, which are then dispersed in the thermogel consisting of plenty of micelles based on poly(dl-lactic acid-co-coglycolic acid)-polyethylene glycol-poly(dl-lactic acid-co-coglycolic acid) (PLGA-PEG-PLGA) copolymer. The Bri@LDH/Thermogel DDS containing 125.0 μg/g of brimonidine has been found to sustainably release the drug for up to 144 h, significantly extending the drug release period compared to that from Bri@LDH nanoparticles. The Bri@LDH/Thermogel DDS is not cytotoxic to human corneal epithelial cells and shows good biocompatibility. In vivo drug release from the special contact lens made of Bri@LDH/Thermogel DDS has been sustained for at least 7 days, which more effectively modulates the relief of intraocular pressure (IOP). Thus, the Bri@LDH/Thermogel DDS is a promising drug delivery alternative that can be used for treatment of severe glaucoma.
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Affiliation(s)
- Jianguo Sun
- Australian Institute for Bioengineering and Nanotechnology, ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland , Brisbane, Queensland 4072, Australia
- State Key Laboratory of Molecular Engineering of Polymers, Fudan University , Shanghai 200433, China
| | | | | | | | | | - Jihong Wu
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Fudan University , Shanghai 200032, China
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology, ARC Centre of Excellence for Functional Nanomaterials, The University of Queensland , Brisbane, Queensland 4072, Australia
| | - Xinghuai Sun
- State Key Laboratory of Medical Neurobiology, Institutes of Brain Science and Collaborative Innovation Center for Brain Science, Fudan University , Shanghai 200032, China
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14
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Gamma irradiation induced in situ synthesis of lead sulfide nanoparticles in poly(vinyl alcohol) hydrogel. Radiat Phys Chem Oxf Engl 1993 2017. [DOI: 10.1016/j.radphyschem.2016.09.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Synthesis, swelling, degradation and cytocompatibility of crosslinked PLLA-PEG-PLLA networks with short PLLA blocks. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.09.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Serra-Gómez R, Dreiss CA, González-Benito J, González-Gaitano G. Structure and Rheology of Poloxamine T1107 and Its Nanocomposite Hydrogels with Cyclodextrin-Modified Barium Titanate Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:6398-6408. [PMID: 27245639 DOI: 10.1021/acs.langmuir.6b01544] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report the preparation of a nanocomposite hydrogel based on a poloxamine gel matrix (Tetronic T1107) and cyclodextrin (CD)-modified barium titanate (BT) nanoparticles. The micellization and sol-gel behavior of pH-responsive block copolymer T1107 were fully characterized by small-angle neutron scattering (SANS), dynamic light scattering (DLS), and Fourier transform infrared attenuated total reflectance (FTIR-ATR) spectroscopy as a function of concentration, pH and temperature. SANS results reveal that spherical micelles in the low concentration regime present a dehydrated core and highly hydrated shell, with a small aggregation number and size, highly dependent on the degree of protonation of the central amine spacer. At high concentration, T1107 undergoes a sol-gel transition, which is inhibited at acidic pH. Nanocomposites were prepared by incorporating CD-modified BT of two different sizes (50 and 200 nm) in concentrated polymer solutions. Rheological measurements show a broadening of the gel region, as well as an improvement of the mechanical properties, as assessed by the shear elastic modulus, G' (up to 200% increase). Initial cytocompatibility studies of the nanocomposites show that the materials are nontoxic with viabilities over 70% for NIH3T3 fibroblast cell lines. Overall, the combination of Tetronics and modified BaTiO3 provides easily customizable systems with promising applications as soft piezoelectric materials.
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Affiliation(s)
| | - Cécile A Dreiss
- Institute of Pharmaceutical Science, King's College London , Franklin-Wilkins Building, 150 Stamford Street, London SE1 9NH, United Kingdom
| | - Javier González-Benito
- Department of Materials Science and Engineering, IQMAAB, Universidad Carlos III de Madrid , 28911 Leganés, Spain
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Pafiti K, Cui Z, Adlam D, Hoyland J, Freemont AJ, Saunders BR. Hydrogel Composites Containing Sacrificial Collapsed Hollow Particles as Dual Action pH-Responsive Biomaterials. Biomacromolecules 2016; 17:2448-58. [DOI: 10.1021/acs.biomac.6b00593] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kyriaki Pafiti
- Biomaterials
Research Group, School of Materials, The University of Manchester, MSS Tower, Manchester M13 9PL, United Kingdom
| | - Zhengxing Cui
- Biomaterials
Research Group, School of Materials, The University of Manchester, MSS Tower, Manchester M13 9PL, United Kingdom
| | - Daman Adlam
- Injury
and Repair, Institute for Inflammation and Repair, Faculty of Medical
and Human Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
| | - Judith Hoyland
- Injury
and Repair, Institute for Inflammation and Repair, Faculty of Medical
and Human Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
- NIHR
Manchester Musculoskeletal Biomedical Research Unit, Manchester Academic Health Science Centre, Manchester M13 9NT, United Kingdom
| | - Anthony J. Freemont
- Injury
and Repair, Institute for Inflammation and Repair, Faculty of Medical
and Human Sciences, University of Manchester, Oxford Road, Manchester, M13 9PT, United Kingdom
- NIHR
Manchester Musculoskeletal Biomedical Research Unit, Manchester Academic Health Science Centre, Manchester M13 9NT, United Kingdom
| | - Brian R. Saunders
- Biomaterials
Research Group, School of Materials, The University of Manchester, MSS Tower, Manchester M13 9PL, United Kingdom
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Mao H, Shan G, Bao Y, Wu ZL, Pan P. Thermoresponsive physical hydrogels of poly(lactic acid)/poly(ethylene glycol) stereoblock copolymers tuned by stereostructure and hydrophobic block sequence. SOFT MATTER 2016; 12:4628-4637. [PMID: 27121732 DOI: 10.1039/c6sm00517a] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
CBABC-type poly(lactic acid) (PLA)/poly(ethylene glycol) (PEG) pentablock copolymers composed of a central PEG block (A) and enantiomeric poly(l-lactic acid) (PLLA, B), poly(d-lactic acid) (PDLA, C) blocks were synthesized. Such pentablock copolymers form physical hydrogels at high concentrations in an aqueous solution, which stem from the aggregation and physical bridging of copolymer micelles. These gels are thermoresponsive and turn into sols upon heating. Physical gelation, gel-to-sol transition, crystalline state, microstructure, rheological behavior, biodegradation, and drug release behavior of PLA/PEG pentablock copolymers and their gels were investigated; they were also compared with PLA-PEG-PLA triblock copolymers containing the isotactic PLLA or atactic poly(d,l-lactide) (PDLLA) endblocks and PLLA-PEG-PLLA/PDLA-PEG-PDLA enantiomeric mixtures. PLA hydrophobic domains in pentablock copolymer gels changed from a homocrystalline to stereocomplexed structure as the PLLA/PDLA block length ratio approached 1/1. The gel of symmetric pentablock copolymer exhibited a wider gelation region, higher gel-to-sol transition temperature, higher hydrophobic domain crystallinity, larger intermicellar distance, higher storage modulus, and slower degradation and drug release rate compared to those of the asymmetric PLA/PEG pentablock copolymers or triblock copolymers. SAXS results indicated that the PLLA/PDLA blocks stereocomplexation in pentablock copolymers facilitated the intermicellar aggregation and bridging. Cylindrical ordered structures were observed in all the gels formed from the PLA/PEG pentablock and triblock copolymers. The stereocomplexation degree and intermicellar distance of the pentablock copolymer gels increased with heating.
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Affiliation(s)
- Hailiang Mao
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
| | - Guorong Shan
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
| | - Yongzhong Bao
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
| | - Zi Liang Wu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China
| | - Pengju Pan
- State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China.
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Xiang W, Zhu Z, Song X, Zhong C, Wang C, Ma Y. Concentration-induced structural transition of block polymer self-assemblies on a nanoparticle surface: computer simulation. RSC Adv 2016. [DOI: 10.1039/c6ra18739k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Film structure of asymmetric triblock copolymers assembled on different degrees of hydrophobic NP surfaces was controlled by concentration.
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Affiliation(s)
- Wenjun Xiang
- School of Chemistry and Chemical Engineering
- Sichuan University of Arts and Science
- Dazhou
- China
| | - Zhaoju Zhu
- School of Chemistry and Chemical Engineering
- Sichuan University of Arts and Science
- Dazhou
- China
| | - Xianyu Song
- Department of Mechanical and Electrical Engineering
- Dazhou Vocational and Technial College
- Dazhou
- China
| | - Cheng Zhong
- Department of Mechanical and Electrical Engineering
- Dazhou Vocational and Technial College
- Dazhou
- China
| | - Chengjie Wang
- School of Chemistry and Chemical Engineering
- Southwest Petroleum University
- Chengdu
- China
| | - Yongzhang Ma
- Sichuan Province Academy of Industrial Environmental Monitoring
- Chengdu 610500
- China
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20
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Affiliation(s)
- Marcelo A da Silva
- MNP, School of Physics and Astronomy; University of Leeds; 8.61 E.C. Stoner Building Leeds LS2 9JT UK
| | - Cécile A Dreiss
- King's College London, Institute of Pharmaceutical Sciences; 150 Stamford Street London SE1 9NH UK
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21
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Pullulan-based composite scaffolds for bone tissue engineering: Improved osteoconductivity by pore wall mineralization. Carbohydr Polym 2015; 123:180-9. [DOI: 10.1016/j.carbpol.2015.01.038] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2014] [Revised: 01/20/2015] [Accepted: 01/23/2015] [Indexed: 11/23/2022]
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22
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Liu X, Bhatia SR. Laponite® and Laponite®‐PEO hydrogels with enhanced elasticity in phosphate‐buffered saline. POLYM ADVAN TECHNOL 2015. [DOI: 10.1002/pat.3514] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xiao Liu
- 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
- Center for Functional Nanomaterials Brookhaven National Laboratory Upton NY 11793 USA
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23
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Chu CY, Chen MH, Wu ML, Chen HL, Chiu YT, Chen SM, Huang CH. Hierarchical structure and crystal orientation in poly(ethylene oxide)/clay nanocomposite films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:2886-2895. [PMID: 24555858 DOI: 10.1021/la4042748] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Water-cast nanocomposite films formed by poly(ethylene oxide) (PEO) and Laponite clay were found to display three characteristic levels of structure with large-scale orientation. The first level with the length scale of ca. 30-50 nm was the clay lamellar bundles, which tended to stack perpendicularly to the film surface. The second level with the characteristic length of 1.8 nm was associated with the alternating stacking of the silicate layers and the PEO chains sandwiched between them. The preferred orientations of these two levels of structure were independent of clay content, solvent removal rate for the film preparation, and the crystallization temperature of the PEO chains situating outside the clay bundles. The third level of structure was characterized by the preferred orientation of the PEO crystalline stems with respect to the surface of the silicate layers. Perpendicular orientation always dominated in the nanocomposite films prepared by slow solvent removal irrespective of crystallization temperature. In the films prepared by fast solvent removal, however, parallel crystal orientation set in as the clay concentration exceeded ca. 33 wt %. The preferred crystal orientation was ascribed to the confinement effect imposed by the clay bundles to the crystallization of the PEO chains situating in the interbundle region. In the films cast by slow solvent removal, the weaker confinement associated with the larger interbundle distance led to perpendicular crystal orientation. When the interbundle distance was reduced to ca. 30 nm in the films prepared by rapid solvent evaporation, the strong confinement directed the crystals to form parallel orientation.
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Affiliation(s)
- Che-Yi Chu
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University , Hsin-Chu 30013, Taiwan
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24
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Yang X, Bakaic E, Hoare T, Cranston ED. Injectable Polysaccharide Hydrogels Reinforced with Cellulose Nanocrystals: Morphology, Rheology, Degradation, and Cytotoxicity. Biomacromolecules 2013; 14:4447-55. [DOI: 10.1021/bm401364z] [Citation(s) in RCA: 238] [Impact Index Per Article: 21.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xuan Yang
- Department of Chemical Engineering, McMaster University, Hamilton, Canada L8S 4L7
| | - Emilia Bakaic
- Department of Chemical Engineering, McMaster University, Hamilton, Canada L8S 4L7
| | - Todd Hoare
- Department of Chemical Engineering, McMaster University, Hamilton, Canada L8S 4L7
| | - Emily D. Cranston
- Department of Chemical Engineering, McMaster University, Hamilton, Canada L8S 4L7
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25
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Sharifi S, Blanquer SBG, van Kooten TG, Grijpma DW. Biodegradable nanocomposite hydrogel structures with enhanced mechanical properties prepared by photo-crosslinking solutions of poly(trimethylene carbonate)-poly(ethylene glycol)-poly(trimethylene carbonate) macromonomers and nanoclay particles. Acta Biomater 2012; 8:4233-43. [PMID: 22995403 DOI: 10.1016/j.actbio.2012.09.014] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2012] [Revised: 09/10/2012] [Accepted: 09/11/2012] [Indexed: 01/14/2023]
Abstract
Soft hydrogels with elasticity modulus values lower than 100kPa that are tough and biodegradable are of great interest in medicine and in tissue engineering applications. We have developed a series of soft hydrogel structures from different methacrylate-functionalized triblock copolymers of poly(ethylene glycol) (PEG) with poly(trimethylene carbonate) (PTMC) by photo-crosslinking aqueous solutions of the macromonomers in 2.5 and 5wt.% colloidal dispersions of clay nanoparticles (Laponite XLG). The length of the PTMC blocks of the macromonomers and the clay content determined the physicomechanical properties of the obtained hydrogels. While an increase in the PTMC block length in the macromonomers from 0.2 to 5kg/mol resulted in a decrease in the gel content, the addition of 5wt.% Laponite nanoclay to the crosslinking solution lead to very high gel contents of the hydrogels of more than 95%. The effect of PTMC block length on the mechanical properties of the hydrogels was not as pronounced, and soft gels with a compressive modulus of less than 15kPa and toughness values of 25kJm(-3) were obtained. However, the addition of 5wt.% Laponite nanoclay to the formulations considerably increased the compressive modulus and resilience of the hydrogels; swollen nanocomposite networks with compressive modulus and toughness values of up to 67kPa and 200kJm(-3), respectively, could then be obtained. The prepared hydrogels were shown to be enzymatically degradable by cholesterol esterase and by the action of macrophages. With an increase in PTMC block length in the hydrogels, the rates of mass loss increased, while the incorporated Laponite nanoclay suppressed degradation. Nanocomposite hydrogel structures with a designed gyroid pore network architecture were prepared by stereolithography. Furthermore, in the swollen state the porous gyroid structures were mechanically stable and the pore network remained fully open and interconnected.
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Affiliation(s)
- Shahriar Sharifi
- W.J. Kolff Institute, Department of Biomedical Engineering, University Medical Centre Groningen, University of Groningen, P.O. Box 196, 9700 AD Groningen, The Netherlands
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26
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Lemmers M, Spruijt E, Akerboom S, Voets IK, van Aelst AC, Stuart MAC, van der Gucht J. Physical gels based on charge-driven bridging of nanoparticles by triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:12311-12318. [PMID: 22834713 DOI: 10.1021/la301917e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We have prepared an aqueous physical gel consisting of negatively charged silica nanoparticles bridged by ABA triblock copolymers, in which the A blocks are positively charged and the B block is neutral and water-soluble. Irreversible aggregation of the silica nanoparticles was prevented by precoating them with a neutral hydrophilic polymer. Both the elastic plateau modulus and the relaxation time increase slowly as the gel ages, indicating an increase both in the number of active bridges and in the strength with which the end blocks are adsorbed. The rate of this aging process can be increased significantly by applying a small shear stress to the sample. Our results indicate that charge-driven bridging of nanoparticles by triblock copolymers is a promising strategy for thickening of aqueous particle containing materials, such as water-based coatings.
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Affiliation(s)
- Marc Lemmers
- Laboratory of Physical Chemistry and Colloid Science, Wageningen University, Wageningen, The Netherlands
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27
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Zhang Q, Mochalin VN, Neitzel I, Hazeli K, Niu J, Kontsos A, Zhou JG, Lelkes PI, Gogotsi Y. Mechanical properties and biomineralization of multifunctional nanodiamond-PLLA composites for bone tissue engineering. Biomaterials 2012; 33:5067-75. [DOI: 10.1016/j.biomaterials.2012.03.063] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Accepted: 03/18/2012] [Indexed: 10/28/2022]
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28
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Viscoelastic and fractal characteristics of a supramolecular hydrogel hybridized with clay nanoparticles. Colloids Surf B Biointerfaces 2010; 81:486-91. [DOI: 10.1016/j.colsurfb.2010.07.044] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 07/19/2010] [Accepted: 07/21/2010] [Indexed: 11/19/2022]
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29
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Agrawal SK, Sanabria-DeLong N, Bhatia SK, Tew GN, Bhatia SR. Energetics of association in poly(lactic acid)-based hydrogels with crystalline and nanoparticle-polymer junctions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:17330-8. [PMID: 20945859 PMCID: PMC3457807 DOI: 10.1021/la102760g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We report the energetics of association in polymeric gels with two types of junction points: crystalline hydrophobic junctions and polymer-nanoparticle junctions. Time-temperature superposition (TTS) of small-amplitude oscillatory rheological measurements was used to probe crystalline poly(L-lactide) (PLLA)-based gels with and without added laponite nanoparticles. For associative polymer gels, the activation energy derived from the TTS shift factors is generally accepted as the associative strength or energy needed to break a junction point. Our systems were found to obey TTS over a wide temperature range of 15-70 °C. For systems with no added nanoparticles, two distinct behaviors were seen, with a transition occurring at a temperature close to the glass transition temperature of PLLA, T(g). Above T(g), the activation energy was similar to the PLLA crystallization enthalpy, suggesting that the activation energy is related to the energy needed to pull a PLLA chain out of the crystalline domain. Below T(g), the activation energy is expected to be the energy required to increase mobility of the polymer chains and soften the glassy regions of the PLLA core. Similar behavior was seen in the nanocomposite gels with added laponite; however, the added clay appears to reduce the average value of the activation enthalpy. This confirms our SAXS results and suggests that laponite particles are participating in the network structure.
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Affiliation(s)
- Sarvesh K. Agrawal
- Department of Chemical Engineering, University of Massachusetts, Amherst, 686 North Pleasant Street, Amherst, MA 01003
| | - Naomi Sanabria-DeLong
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, 120 Governors Drive, Amherst, MA 01003
| | - Sujata K. Bhatia
- Dupont Applied BioSciences, Experimental Station E328/140B, Wilmington, DE 19880
| | - Gregory N. Tew
- Department of Polymer Science and Engineering, University of Massachusetts, Amherst, 120 Governors Drive, Amherst, MA 01003
| | - Surita R. Bhatia
- Department of Chemical Engineering, University of Massachusetts, Amherst, 686 North Pleasant Street, Amherst, MA 01003
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30
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Damm C, Mallembakam MR, Voronov A, Peukert W. Production of filled hydrogels by mechanochemically induced polymerization. J Appl Polym Sci 2010. [DOI: 10.1002/app.33102] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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31
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Al Helou M, Anjum N, Guedeau-Boudeville MA, Rosticher M, Mourchid A. Structure and mechanical properties of polylactide copolymer microspheres and capsules. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.09.023] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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32
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Xu W, Ma J, Jabbari E. Material properties and osteogenic differentiation of marrow stromal cells on fiber-reinforced laminated hydrogel nanocomposites. Acta Biomater 2010; 6:1992-2002. [PMID: 19995620 DOI: 10.1016/j.actbio.2009.12.003] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 11/24/2009] [Accepted: 12/01/2009] [Indexed: 12/01/2022]
Abstract
The fibrils in the bone matrix are glued together by extracellular matrix proteins to form laminated structures (osteons) to provide elasticity and a supportive substrate for osteogenesis. The objective of this work was to investigate material properties and osteogenic differentiation of bone marrow stromal (BMS) cells seeded on osteon-mimetic fiber-reinforced hydrogel/apatite composites. Layers of electrospun poly(l-lactide) fiber mesh coated with a poly(lactide-co-ethylene oxide fumarate) (PLEOF) hydrogel precursor solution were stacked and pressed together, and crosslinked to produce a laminated fiber-reinforced composite. Hydroxyapatite (HA) nanocrystals were added to the precursor solution to produce an osteoconductive matrix for BMS cells. Acrylamide-terminated Arg-Gly-Asp (RGD) peptide (Ac-GRGD) was conjugated to the PLEOF/HA hydrogel phase to promote focal point adhesion of BMS cells. Laminates were characterized with respect to the Young's modulus, degradation kinetics and osteogenic differentiation of BMS cells. The moduli of the laminates under dry and wet conditions were significantly higher than those of the fiber mesh and PLEOF/HA hydrogel, and within the range of values reported for wet human cancellous bone. At days 14 and 21, alkaline phosphatase (ALPase) activity of the laminates was significantly higher than those of the fiber mesh and hydrogel. Lamination significantly increased the extent of mineralization of BMS cells and laminates with HA and conjugated with RGD (Lam-RGD-HA) had 2.7-, 3.5- and 2.8-fold higher calcium content (compared to laminates without HA or RGD) after 7, 14 and 21days, respectively. The Lam-RGD-HA group had significantly higher expression of osteopontin and osteocalcin compared to the hydrogel or laminates without HA or RGD, consistent with the higher ALPase activity and calcium content of Lam-RGD-HA. Laminated osteon-mimetic structures have the potential to provide mechanical strength to the regenerating region as well as supporting the differentiation of progenitor cells to the osteogenic lineage.
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Affiliation(s)
- Weijie Xu
- Biomimetic Materials and Tissue Engineering Laboratories, Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, USA
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33
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Hu X, Wang T, Xiong L, Wang C, Liu X, Tong Z. Preferential adsorption of poly(ethylene glycol) on hectorite clay and effects on poly(N-isopropylacrylamide)/hectorite nanocomposite hydrogels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:4233-4238. [PMID: 19994842 DOI: 10.1021/la903298n] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Poly(N-isopropylacrylamide)/Laponite nanocomposite hydrogel (NC gel) was synthesized via in situ polymerization in the Laponite suspension containing PEG. The adsorption of PEG on Laponite platelets was characterized by zeta-potential, which decreased with the PEG adsorption. The tensile strength decreased and elongation at break increased with increasing PEG concentration. The effective network chain density of PNIPAm/Laponite NC gels determined from the equilibrium modulus G(e) decreased upon adsorption of PEG on the Laponite. All of these results revealed the preferential adsorption of PEG on the Laponite platelets occupying the active sites for the PNIPAm chain anchoring, which hindered their cross-linking effect in the NC gels. However, the temperature sensitive swelling behavior still remained in the PNIPAm/Laponite NC gels containing PEG with higher swelling volume below the LCST due to the lower cross-linker density. By adjusting the amount of added PEG, we can easily control the properties of the PNIPAm/Laponite NC gels.
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Affiliation(s)
- Xiaobo Hu
- Research Institute of Materials Science, South China University of Technology, Guangzhou 510640, China
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34
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Posocco P, Fermeglia M, Pricl S. Morphology prediction of block copolymers for drug delivery by mesoscale simulations. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/c0jm01301c] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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Baker BM, Handorf AM, Ionescu LC, Li WJ, Mauck RL. New directions in nanofibrous scaffolds for soft tissue engineering and regeneration. Expert Rev Med Devices 2009; 6:515-32. [PMID: 19751124 DOI: 10.1586/erd.09.39] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
This review focuses on the role of nanostructure and nanoscale materials for tissue engineering applications. We detail a scaffold production method (electrospinning) for the production of nanofiber-based scaffolds that can approximate many critical features of the normal cellular microenvironment, and so foster and direct tissue formation. Further, we describe new and emerging methods to increase the applicability of these scaffolds for in vitro and in vivo application. This discussion includes a focus on methods to further functionalize scaffolds to promote cell infiltration, methods to tune scaffold mechanics to meet in vivo demands and methods to control the release of pharmaceuticals and other biologic agents to modulate the wound environment and foster tissue regeneration. This review provides a perspective on the state-of-the-art production, application and functionalization of these unique nanofibrous structures, and outlines future directions in this growing field.
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Affiliation(s)
- Brendon M Baker
- McKay Orthopaedic Research Laboratory, Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA 19104, USA
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36
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Stefanescu EA, Daranga C, Stefanescu C. Insight into the Broad Field of Polymer Nanocomposites: From Carbon Nanotubes to Clay Nanoplatelets, via Metal Nanoparticles. MATERIALS 2009. [PMCID: PMC5513574 DOI: 10.3390/ma2042095] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Highly ordered polymer nanocomposites are complex materials that display a rich morphological behavior owing to variations in composition, structure, and properties on a nanometer length scale. Metal-polymer nanocomposite materials are becoming more popular for applications requiring low cost, high metal surface areas. Catalytic systems seem to be the most prevalent application for a wide range of metals used in polymer nanocomposites, particularly for metals like Pt, Ni, Co, and Au, with known catalytic activities. On the other hand, among the most frequently utilized techniques to prepare polymer/CNT and/or polymer/clay nanocomposites are approaches like melt mixing, solution casting, electrospinning and solid-state shear pulverization. Additionally, some of the current and potential applications of polymer/CNT and/or polymer/clay nanocomposites include photovoltaic devices, optical switches, electromagnetic interference (EMI) shielding, aerospace and automotive materials, packaging, adhesives and coatings. This extensive review covers a broad range of articles, typically from high impact-factor journals, on most of the polymer-nanocomposites known to date: polymer/carbon nanotubes, polymer/metal nanospheres, and polymer/clay nanoplatelets composites. The various types of nanocomposites are described form the preparation stages to performance and applications. Comparisons of the various types of nanocomposites are conducted and conclusions are formulated.
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Affiliation(s)
- Eduard A. Stefanescu
- Department of Chemical & Life Science Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA
- Authors to whom correspondence should be addressed; E-Mail: (E.A.S); Tel.: +1-804-827-7000; Fax: +1-804-828-3846; E-Mail: (C.S.); Tel.: +1-225-578-1720; Fax: +1-225-578- 2697
| | - Codrin Daranga
- Department of Civil & Environmental Engineering, University of Wisconsin, Madison, WI 53706, USA; E-Mail: (C.D.)
| | - Cristina Stefanescu
- Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803, USA
- Authors to whom correspondence should be addressed; E-Mail: (E.A.S); Tel.: +1-804-827-7000; Fax: +1-804-828-3846; E-Mail: (C.S.); Tel.: +1-225-578-1720; Fax: +1-225-578- 2697
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37
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Liang S, Liu L, Huang Q, Yam KL. Unique Rheological Behavior of Chitosan-Modified Nanoclay at Highly Hydrated State. J Phys Chem B 2009; 113:5823-8. [DOI: 10.1021/jp8107304] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Songmiao Liang
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| | - Linshu Liu
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| | - Qingrong Huang
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
| | - Kit L. Yam
- Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, Eastern Regional Research Center, United States Department of Agriculture, 600 East Mermaid Lane, Wyndmoor, Pennsylvania 19038
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