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Xing M, Yang G, Liu H, Zhou Z, Zhang S, Gao Y. Industrializable approach for preparing hydrogel microneedles and their application in melanoma treatment. Int J Pharm 2024; 653:123883. [PMID: 38341048 DOI: 10.1016/j.ijpharm.2024.123883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 02/02/2024] [Accepted: 02/03/2024] [Indexed: 02/12/2024]
Abstract
Microneedles (MNs) technology has been studied in transdermal drug delivery for more than 20 years with hundreds of clinical trials conducted. However, there are currently no commercially available MNs in medicine due to challenges in materials safety, cost-effective fabrication, and large-scale manufacturing. Herein, an approach for rapid and green fabrication of hydrogel microneedles (HMNs) based on infrared irradiation process was proposed for the first time. The optimized formulation consisted of polyvinyl alcohol (PVA) and polyvinyl pyrrolidone (PVP), which acted as cross-linked materials and pore-forming agents, respectively. The manufacturing method involved placing MNs patches under infrared irradiation at 70 °C for 2 min and annealing to obtain HMNs with excellent swelling behavior, mechanical strength, and biocompatibility. When model drugs azelaic acid (AZA) and matrine (MAT) were loaded into HMNs systems, the chemical stability of MAT was significantly improved. Ex vivo transdermal delivery experiments indicated that HMNs could achieve synchronous release of AZA and MAT, and the 24-hour percutaneous permeability rates of both drugs were 73.09 ± 0.48 % and 71.56 ± 1.23 %, respectively. In-vivo pharmacokinetic studies, HMNs administration presented dose-dependent stable blood drug concentrations for both drugs. Additionally, prominent anti-tumor efficacy and biosecurity were observed in the drug-loaded HMNs group in the pharmacodynamic evaluation. In summary, the efficient, convenient, and low-cost fabrication method based on infrared irradiation offers the possibility of mass production of drug-loaded HMNs, showing potential for industrial manufacturing development.
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Affiliation(s)
- Mengzhen Xing
- Key Laboratory of New Material Research Institute, Department of Pharmaceutical Research Institute, Shandong University of Traditional Chinese Medicine, Jinan 250355, China; Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry of Chinese Academy of Sciences, Beijing 100190, China.
| | - Guozhong Yang
- Beijing CAS Microneedle Technology Ltd, Beijing 102609, China.
| | - Han Liu
- Beijing CAS Microneedle Technology Ltd, Beijing 102609, China.
| | - Zequan Zhou
- Beijing CAS Microneedle Technology Ltd, Beijing 102609, China.
| | - Suohui Zhang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry of Chinese Academy of Sciences, Beijing 100190, China; Beijing CAS Microneedle Technology Ltd, Beijing 102609, China.
| | - Yunhua Gao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry of Chinese Academy of Sciences, Beijing 100190, China; Beijing CAS Microneedle Technology Ltd, Beijing 102609, China; Qingdao Academy of Chinese Medical Sciences, Shandong University of Traditional Chinese Medicine, 266112 Qingdao, China.
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2
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Ren H, Guo A, Luo C. Sandwich hydrogel to realize cartilage-mimetic structures and performances from polyvinyl alcohol, chitosan and sodium hyaluronate. Carbohydr Polym 2024; 328:121738. [PMID: 38220330 DOI: 10.1016/j.carbpol.2023.121738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 12/12/2023] [Accepted: 12/23/2023] [Indexed: 01/16/2024]
Abstract
Developing artificial substitutes that mimic the structures and performances of natural cartilage is of great importance. However, it is challenging to integrate the high strength, excellent biocompatibility, low coefficient of friction, long-term wear resistance, outstanding swelling resistance, and osseointegration potential into one material. Herein, a sandwich hydrogel with cartilage-mimetic structures and performances was prepared to achieve this goal. The precursor hydrogel was obtained by freezing-thawing the mixture of poly vinyl alcohol, chitosan and deionized water three cycles, accompanied by soaking in sodium hyaluronate solution. The top of the precursor hydrogel was hydrophobically modified with lauroyl chloride and then loaded with lecithin, while the bottom was mineralized with hydroxyapatite. Due to the multiple linkages (crystalline domains, hydrogen bonds, and ionic interactions), the compressive stress was 71 MPa. Owing to the synergy of the hydrophobic modification and lecithin, the coefficient of friction was 0.01. Additionally, no wear trace was observed after 50,000 wear cycles. Remarkably, hydroxyapatite enabled the hydrogel osseointegration potential. The swelling ratio of the hydrogel was 0.06 g/g after soaking in simulated synovial fluid for 7 days. Since raw materials were non-toxic, the cell viability was 100 %. All of the above merits make it an ideal material for cartilage replacement.
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Affiliation(s)
- Hanyu Ren
- College of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, Ningxia 750021, China
| | - Andi Guo
- College of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, Ningxia 750021, China
| | - Chunhui Luo
- College of Chemistry and Chemical Engineering, North Minzu University, Yinchuan, Ningxia 750021, China; Key Laboratory of Chemical Engineering and Technology, State Ethnic Affairs Commission, North Minzu University, Yinchuan 750021, Ningxia, China; Ningxia Key Laboratory of Solar Chemical Conversion Technology, North Minzu University, Yinchuan 750021, China.
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3
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Wang Y, Yu W, Liu S. Physically cross-linked gellan gum/hydrophobically associated polyacrylamide double network hydrogel for cartilage repair. Eur Polym J 2022. [DOI: 10.1016/j.eurpolymj.2022.111074] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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4
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Liu S, Zhou X, Nie L, Wang Y, Hu Z, Okoro OV, Shavandi A, Fan L. Anisotropic PLGA microsphere/PVA hydrogel composite with aligned macroporous structures for directed cell adhesion and proliferation. INT J POLYM MATER PO 2021. [DOI: 10.1080/00914037.2021.2018317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Shuang Liu
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
| | - Xiaohu Zhou
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
| | - Lei Nie
- College of Life Sciences, Xinyang Normal University, Xinyang, China
| | - Youli Wang
- Rizhao Biomedicine and New Materials Research, Wuhan University of Technology, Rizhao, China
| | - Zhihai Hu
- Rizhao Biomedicine and New Materials Research, Wuhan University of Technology, Rizhao, China
| | - Oseweuba Valentine Okoro
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles - BioMatter Unit, Brussels, Belgium
| | - Amin Shavandi
- Université libre de Bruxelles (ULB), École polytechnique de Bruxelles - BioMatter Unit, Brussels, Belgium
| | - Lihong Fan
- School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, China
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5
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Bonyadi SZ, Atten M, Dunn AC. Self-regenerating compliance and lubrication of polyacrylamide hydrogels. SOFT MATTER 2019; 15:8728-8740. [PMID: 31553022 DOI: 10.1039/c9sm01607d] [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
Pristine hydrogel surfaces typically have low friction, which is controlled by composition, slip speeds, and immediate slip history. The stiffness of such samples is typically measured with bulk techniques, and is assumed to be homogeneous at the surface. While the surface properties of homogeneous hydrogel samples are generally controlled by composition, the surface also interfaces with the open bath, which distinguishes it from the bulk. In this work, we disrupt as-molded polyacrylamide surfaces with abrasive wear and connect the effects on the surface stiffness and lubrication to the wear events. At both the nanoscale and the microscale, quasistatic indentations reveal a stiffer surface by up to two times following wear events, even considering roughness. Longitudinal experiments with a series of wear episodes interposed with periods of re-equilibration show that increased stiffness is reversible: more compliant surfaces regenerate within 24 hours. The timescale suggests an osmotic swelling mechanism, and we postulate that abrasive wear removes a swollen surface layer, revealing the stiffer bulk. The newly-revealed bulk becomes the surface, which re-swells over time. We quantify the effects on the self-lubricating ability of these surfaces following abrasive wear using micro-tribometry. The lubrication curve shows that robust low friction is maintained, and that the friction becomes less dependent upon the sliding speed. The unique ability of these materials to regenerate swollen surfaces and maintain robust low friction following abrasive wear is promising for designing their slip behavior into aqueous soft robotics components or biomedicine applications.
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Affiliation(s)
- Shabnam Z Bonyadi
- Department of Mechanical Science & Engineering, University of Illinois at Urbana-Champaign, MechSE @ UIUC, 1206 W Green St, MC 244, Urbana, IL 61801, USA.
| | - Michael Atten
- Department of Mechanical Science & Engineering, University of Illinois at Urbana-Champaign, MechSE @ UIUC, 1206 W Green St, MC 244, Urbana, IL 61801, USA.
| | - Alison C Dunn
- Department of Mechanical Science & Engineering, University of Illinois at Urbana-Champaign, MechSE @ UIUC, 1206 W Green St, MC 244, Urbana, IL 61801, USA.
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Li B, Gao Y, Guo L, Fan Y, Kawazoe N, Fan H, Zhang X, Chen G. Synthesis of photo-reactive poly (vinyl alcohol) and construction of scaffold-free cartilage like pellets in vitro. Regen Biomater 2018; 5:159-166. [PMID: 29942648 PMCID: PMC6007571 DOI: 10.1093/rb/rby009] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Revised: 04/04/2018] [Accepted: 04/11/2018] [Indexed: 12/24/2022] Open
Abstract
Photo-reactive poly(vinyl alcohol) (PRPVA) was synthesized by introduction of phenyl azido groups into poly(vinyl alcohol) (PVA) and applied for surface modification. PRPVA was grafted onto cell culture plate surface homogeneously or in a micropattern. Human mesenchymal stem cells (hMSCs) cultured on cell culture plate surface and PVA-modified surface showed different behaviors. Cells adhered and spread well on cell culture plate surface, while they did not adhere on PVA-grafted surface at all. When hMSCs were cultured on PVA-micropatterned surface, they formed a cell micropattern. Cells formed pellets after cultured on PVA homogeneously modified surface in chondrogenic induction medium for 2 weeks. The pellets were positively stained by hematoxylin/eosin, safranin-O/fast green and toluidin blue, and they were also stained brown by Type II collagen and proteoglycan immunohistological staining. Real-time PCR analysis was conducted to investigate the expression of colI, colII, colX, aggrecan and sox9 mRNA. Results of gene expression were in agreement with those of histological and immunohistological observations. These results indicated that hMSCs cultured on PVA-modified surface performed chondrogenic differentiation, and it was possible to construct scaffold-free cartilage like pellets with PVA-modified surface in vitro.
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Affiliation(s)
- Bao Li
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, China
| | - Yongli Gao
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, China
| | - Likun Guo
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, China.,Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Yujiang Fan
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, China
| | - Naoki Kawazoe
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
| | - Hongsong Fan
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, China
| | - Xingdong Zhang
- National Engineering Research Center for Biomaterials, Sichuan University, 29 Wangjiang Road, Chengdu, Sichuan 610064, China
| | - Guoping Chen
- Research Center for Functional Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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Yao H, Kang J, Li W, Liu J, Xie R, Wang Y, Liu S, Wang DA, Ren L. Novel
β
-TCP/PVA bilayered hydrogels with considerable physical and bio-functional properties for osteochondral repair. Biomed Mater 2017; 13:015012. [DOI: 10.1088/1748-605x/aa8541] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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8
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Properties and toughening mechanisms of PVA/PAM double-network hydrogels prepared by freeze-thawing and anneal-swelling. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 77:1017-1026. [DOI: 10.1016/j.msec.2017.03.287] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2016] [Revised: 03/24/2017] [Accepted: 03/30/2017] [Indexed: 01/31/2023]
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9
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The mechanical importance of myelination in the central nervous system. J Mech Behav Biomed Mater 2017; 76:119-124. [PMID: 28462864 DOI: 10.1016/j.jmbbm.2017.04.017] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2017] [Accepted: 04/12/2017] [Indexed: 02/06/2023]
Abstract
Neurons in the central nervous system are surrounded and cross-linked by myelin, a fatty white substance that wraps around axons to create an electrically insulating layer. The electrical function of myelin is widely recognized; yet, its mechanical importance remains underestimated. Here we combined nanoindentation testing and histological staining to correlate brain stiffness to the degree of myelination in immature, pre-natal brains and mature, post-natal brains. We found that both gray and white matter tissue stiffened significantly (p≪0.001) upon maturation: the gray matter stiffness doubled from 0.31±0.20kPa pre-natally to 0.68±0.20kPa post-natally; the white matter stiffness tripled from 0.45±0.18kPa pre-natally to 1.33±0.64kPa post-natally. At the same time, the white matter myelin content increased significantly (p≪0.001) from 58±2% to 74±9%. White matter stiffness and myelin content were correlated with a Pearson correlation coefficient of ρ=0.92 (p≪0.001). Our study suggests that myelin is not only important to ensure smooth electrical signal propagation in neurons, but also to protect neurons against physical forces and provide a strong microstructural network that stiffens the white matter tissue as a whole. Our results suggest that brain tissue stiffness could serve as a biomarker for multiple sclerosis and other forms of demyelinating disorders. Understanding how tissue maturation translates into changes in mechanical properties and knowing the precise brain stiffness at different stages of life has important medical implications in development, aging, and neurodegeneration.
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10
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Synthesis and characterization of a zwitterionic hydrogel blend with low coefficient of friction. Acta Biomater 2016; 46:245-255. [PMID: 27650587 DOI: 10.1016/j.actbio.2016.09.022] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 08/02/2016] [Accepted: 09/16/2016] [Indexed: 02/07/2023]
Abstract
Hydrogels display a great deal of potential for a wide variety of biomedical applications. Often times the performance of these biomimetic materials is limited due to inferior friction and wear properties. This manuscript presents a method inspired by the tribological phenomena observed in nature for enhancing the lubricious properties of poly(vinyl alcohol) (PVA) hydrogels. This was achieved by blending PVA with various amounts of zwitterionic polymer, poly([2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide) (pMEDSAH). Our results indicate that pMEDSAH acts as an effective boundary lubricant, allowing for reduction in coefficient of friction by more than 80%. This reduction in friction coefficient was achieved while maintaining comparable mechanical and physical properties to that of the neat material. Also, these zwitterionic blends were found to be cytocompatible. Analysis of the structure to property relationships within this system indicate that the zwitterionic polymer served as a boundary lubricant and promoted a reduction in friction through hydration lubrication. This novel approach provides a promising platform for further investigations enhancing the tribological properties of hydrogels for biomedical applications. STATEMENT OF SIGNIFICANCE The novelty of this work stems from showing that zwitterionic polymers can be used as an extremely effective hydrogel boundary lubricant. This work will have significant scientific impact because to date, design of hydrogels has emphasized replication of mechanical properties, but in order for these types of materials to be fully utilized as biomaterials it is imperative that they possess improved tribological and lubrication properties, because ignoring the surface and boundary lubrication mechanism, make these potential load-bearing substitutes incompatible with other natural articulating surfaces, leading the constructs to wear, fail, and damage healthy tissue. Our work also provides unique insight to the structure-property-function relationships of these biomaterials which will be of great interest to the readership of the journal.
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Weickenmeier J, de Rooij R, Budday S, Steinmann P, Ovaert T, Kuhl E. Brain stiffness increases with myelin content. Acta Biomater 2016; 42:265-272. [PMID: 27475531 DOI: 10.1016/j.actbio.2016.07.040] [Citation(s) in RCA: 162] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 05/31/2016] [Accepted: 07/22/2016] [Indexed: 10/21/2022]
Abstract
UNLABELLED Brain stiffness plays an important role in neuronal development and disease, but reported stiffness values vary significantly for different species, for different brains, and even for different regions within the same brain. Despite extensive research throughout the past decade, the mechanistic origin of these stiffness variations remains elusive. Here we show that brain tissue stiffness is correlated to the underlying tissue microstructure and directly proportional to the local myelin content. In 116 indentation tests of six freshly harvested bovine brains, we found that the cerebral stiffnesses of 1.33±0.63kPa in white matter and 0.68±0.20kPa in gray matter were significantly different (p<0.01). Strikingly, while the inter-specimen variation was rather moderate, the minimum and maximum cerebral white matter stiffnesses of 0.59±0.19 kPa and 2.36±0.64kPa in each brain varied by a factor of four on average. To provide a mechanistic interpretation for this variation, we performed a histological characterization of the tested brain regions. We stained the samples with hematoxylin and eosin and luxol fast blue and quantified the local myelin content using image analysis. Interestingly, we found that the cerebral white matter stiffness increased with increasing myelin content, from 0.72kPa at a myelin content of 64-2.45kPa at a myelin content of 89%, with a Pearson correlation coefficient of ρ=0.91 (p<0.01). This direct correlation could have significant neurological implications. During development, our results could help explain why immature, incompletely myelinated brains are softer than mature, myelinated brains and more vulnerable to mechanical insult as evident, for example, in shaken baby syndrome. During demyelinating disease, our findings suggest to use stiffness alterations as clinical markers for demyelination to quantify the onset of disease progression, for example, in multiple sclerosis. Taken together, our study indicates that myelin might play a more important function than previously thought: It not only insulates signal propagation and improves electrical function of single axons, it also provides structural support and mechanical stiffness to the brain as a whole. STATEMENT OF SIGNIFICANCE Increasing evidence suggests that the mechanical environment of the brain plays an important role in neuronal development and disease. Reported stiffness values vary significantly, but the origin of these variations remains unknown. Here we show that stiffness of our brain is correlated to the underlying tissue microstructure and directly proportional to the local myelin content. Myelin has been discovered in 1854 as an insulating layer around nerve cells to improve electric signal propagation. Our study now shows that it also plays an important mechanical role: Using a combined mechanical characterization and histological characterization, we found that the white matter stiffness increases linearly with increasing myelin content, from 0.5kPa at a myelin content of 63-2.5kPa at 92%.
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12
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Kim J, Dunn AC. Soft hydrated sliding interfaces as complex fluids. SOFT MATTER 2016; 12:6536-6546. [PMID: 27425448 DOI: 10.1039/c6sm00623j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Hydrogel surfaces are biomimics for sensing and mobility systems in the body such as the eyes and large joints due to their important characteristics of flexibility, permeability, and integrated aqueous component. Recent studies have shown polymer concentration gradients resulting in a less dense region in the top micrometers of the surface. Under shear, this gradient is hypothesized to drive lubrication behavior due to its rheological similarity to a semi-dilute polymer solution. In this work we map 3 distinct lubricating regimes between a polyacrylamide surface and an aluminum annulus using stepped-velocity tribo-rheometry over 5 decades of sliding speed in increasing and decreasing steps. These regimes, characterized by weakly or strongly time-dependent response and thixotropy-like hysteresis, provide the skeleton of a lubrication curve for hydrogel-against-hard material interfaces and support hypotheses of polymer mechanics-driven lubrication. Tribo-rheometry is particularly suited to uncover the lubrication mechanisms of complex interfaces such as are formed with hydrated hydrogel surfaces and biological surfaces.
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Affiliation(s)
- Jiho Kim
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
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13
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Li W, Wang D, Yang W, Song Y. Compressive mechanical properties and microstructure of PVA–HA hydrogels for cartilage repair. RSC Adv 2016. [DOI: 10.1039/c6ra02166b] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
In this paper, hydroxyapatite (HA) was deposited on poly(vinyl alcohol) (PVA) molecular chains by an in situ synthetic method.
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Affiliation(s)
- Wenxu Li
- Dept. of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Duo Wang
- Dept. of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Wen Yang
- Dept. of Chemistry
- Harbin Institute of Technology
- Harbin 150001
- China
| | - Ying Song
- Chemical Engineering and Technology
- Harbin Institute of Technology
- Harbin
- China
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Du M, Zhang Y, Song Y, Zheng Q. Negative velocity dependence of friction for poly(2-Acrylamido-2-methyl propanesulfonic acid) hydrogel sliding against a glass surface in the low-velocity region. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23480] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Miao Du
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
| | - Yan Zhang
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
| | - Yihu Song
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
| | - Qiang Zheng
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering; Zhejiang University; Hangzhou 310027 China
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15
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Delattre E, Lemière G, Desmurs JR, Boulay B, Duñach E. Poly(vinyl alcohol) functionalization with aldehydes in organic solvents: Shining properties of poly(vinyl acetals). J Appl Polym Sci 2014. [DOI: 10.1002/app.40677] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Emilie Delattre
- Institut de Chimie de Nice; Université de Nice Sophia-Antipolis; UMR 7272, CNRS, Faculté des Sciences Parc Valrose, 06108 Nice Cedex 2 France
- Chanel Parfums Beauté; 8 rue du Cheval Blanc, CS 40045, 93694 Pantin Cedex France
| | - Gilles Lemière
- Institut de Chimie de Nice; Université de Nice Sophia-Antipolis; UMR 7272, CNRS, Faculté des Sciences Parc Valrose, 06108 Nice Cedex 2 France
| | - Jean-Roger Desmurs
- CDP-Innovation SAS; Espace G2C, 63 Rue André Bollier, 69307 Lyon cedex 7 France
| | - Benjamin Boulay
- Chanel Parfums Beauté; 8 rue du Cheval Blanc, CS 40045, 93694 Pantin Cedex France
| | - Elisabet Duñach
- Institut de Chimie de Nice; Université de Nice Sophia-Antipolis; UMR 7272, CNRS, Faculté des Sciences Parc Valrose, 06108 Nice Cedex 2 France
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Chu E, Sidorenko A. Surface reconstruction by a "grafting through" approach: polyacrylamide grafted onto chitosan film. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:12585-12592. [PMID: 24024703 DOI: 10.1021/la402609w] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Grafted polymers and polymer brushes in particular have attracted significant attention in the last 2 decades as a way to alter and control interfacial properties. In the case of polymer brushes on solid substrates, a high grafting density of polymer chains results in stretching of the polymer coils normal to the substrate surface due to the effect of excluded volume. In this study, polyacrylamide is grafted to the surface of relatively soft thin films of chitosan. The "grafting through" approach is used by introducing double C═C bonds to amino groups of chitosan. The acquired kinetic data of grafting along with AFM and ellipsometry characterization suggest that the chitosan substrate undergoes surface reconstruction during the grafting of PAAm and simultaneously induces PAAm growth inside the soft substrate. As a result, much higher amounts of grafted polymer are achieved in comparison to traditional hard substrates like silicon or glass. Additionally, selective plasma etching of PAAm reveals filament-like structures oriented normal to the surface.
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Affiliation(s)
- Elza Chu
- Department of Chemistry & Biochemistry, University of the Sciences in Philadelphia , Philadelphia, Pennsylvania 19104, United States
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Low friction hydrogel for articular cartilage repair: Evaluation of mechanical and tribological properties in comparison with natural cartilage tissue. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:4377-83. [DOI: 10.1016/j.msec.2013.06.035] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2012] [Revised: 04/09/2013] [Accepted: 06/20/2013] [Indexed: 11/24/2022]
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18
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Bibliography Current World Literature. CURRENT ORTHOPAEDIC PRACTICE 2013. [DOI: 10.1097/bco.0b013e3182a6a18b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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