1
|
Kitajima H, Hirota M, Osawa K, Iwai T, Mitsudo K, Saruta J, Ogawa T. The Effects of a Biomimetic Hybrid Meso- and Nano-Scale Surface Topography on Blood and Protein Recruitment in a Computational Fluid Dynamics Implant Model. Biomimetics (Basel) 2023; 8:376. [PMID: 37622981 PMCID: PMC10452410 DOI: 10.3390/biomimetics8040376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2023] [Revised: 08/04/2023] [Accepted: 08/11/2023] [Indexed: 08/26/2023] Open
Abstract
The mechanisms underlying bone-implant integration, or osseointegration, are still incompletely understood, in particular how blood and proteins are recruited to implant surfaces. The objective of this study was to visualize and quantify the flow of blood and the model protein fibrinogen using a computational fluid dynamics (CFD) implant model. Implants with screws were designed with three different surface topographies: (1) amorphous, (2) nano-trabecular, and (3) hybrid meso-spikes and nano-trabeculae. The implant with nano-topography recruited more blood and fibrinogen to the implant interface than the amorphous implant. Implants with hybrid topography further increased recruitment, with particularly efficient recruitment from the thread area to the interface. Blood movement significantly slowed at the implant interface compared with the thread area for all implants. The blood velocity at the interface was 3- and 4-fold lower for the hybrid topography compared with the nano-topography and amorphous surfaces, respectively. Thus, this study for the first time provides insights into how different implant surfaces regulate blood dynamics and the potential advantages of surface texturization in blood and protein recruitment and retention. In particular, co-texturization with a hybrid meso- and nano-topography created the most favorable microenvironment. The established CFD model is simple, low-cost, and expected to be useful for a wide range of studies designing and optimizing implants at the macro and micro levels.
Collapse
Affiliation(s)
- Hiroaki Kitajima
- Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA (M.H.); (J.S.)
- Division of Regenerative and Reconstructive Sciences, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan; (K.O.); (T.I.); (K.M.)
| | - Makoto Hirota
- Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA (M.H.); (J.S.)
- Division of Regenerative and Reconstructive Sciences, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA
- Department of Oral and Maxillofacial Surgery/Orthodontics, Yokohama City University Medical Center, 4-57 Urafune-cho, Minami-ku, Yokohama 232-0024, Japan
| | - Kohei Osawa
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan; (K.O.); (T.I.); (K.M.)
| | - Toshinori Iwai
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan; (K.O.); (T.I.); (K.M.)
| | - Kenji Mitsudo
- Department of Oral and Maxillofacial Surgery, Graduate School of Medicine, Yokohama City University, 3-9 Fukuura, Kanazawa-ku, Yokohama 236-0004, Japan; (K.O.); (T.I.); (K.M.)
| | - Juri Saruta
- Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA (M.H.); (J.S.)
- Department of Education Planning, School of Dentistry, Kanagawa Dental University, 82 Inaoka, Yokosuka 238-8580, Japan
| | - Takahiro Ogawa
- Weintraub Center for Reconstructive Biotechnology, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA (M.H.); (J.S.)
- Division of Regenerative and Reconstructive Sciences, UCLA School of Dentistry, Los Angeles, CA 90095-1668, USA
| |
Collapse
|
2
|
Huang H, Ding M, Zhang Y, Zhang S, Ling Y, Wang W, Zhang S. How organic switches grafting on TiO 2 modifies the surface potentials: theoretical insights. RSC Adv 2023; 13:15148-15156. [PMID: 37213332 PMCID: PMC10193125 DOI: 10.1039/d3ra00537b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2023] [Accepted: 05/01/2023] [Indexed: 05/23/2023] Open
Abstract
Hybrid organic switch-inorganic semiconductor systems have important applications in both photo-responsive intelligent surfaces and microfluidic devices. In this context, herein, we performed first-principles calculations to investigate a series of organic switches of trans/cis-azobenzene fluoride and pristine/oxidized trimethoxysilane adsorbed on low-index anatase slabs. The trends in the surface-adsorbate interplay were examined in terms of the electronic structures and potential distributions. Consequently, it was found that the cis-azobenzene fluoride (oxidized trimethoxysilane)-terminated anatase surface attains a lower ionization potential than the trans-azobenzene fluoride (pristine trimethoxysilane)-terminated anatase surface due to its smaller induced (larger intrinsic) dipole moment, whose direction points inwards (outwards) from the substrate, which originates from the electron charge redistribution at the interface (polarity of attached hydroxyl groups). By combining the induced polar interaction analysis and the experimental measurements in the literature, we demonstrate that the ionization potential is an important predictor of the surface wetting properties of adsorbed systems. The anisotropic absorbance spectra of anatase grafted with azobenzene fluoride and trimethoxysilane are also related to the photoisomerization and oxidization process under UV irradiation, respectively.
Collapse
Affiliation(s)
- Haiming Huang
- Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University Guangzhou 510006 China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University Guangzhou 510555 China
| | - Mingquan Ding
- Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University Guangzhou 510006 China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University Guangzhou 510555 China
| | - Yu Zhang
- Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University Guangzhou 510006 China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University Guangzhou 510555 China
| | - Shuai Zhang
- Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University Guangzhou 510006 China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University Guangzhou 510555 China
| | - Yiyun Ling
- Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University Guangzhou 510006 China
| | - Weiliang Wang
- School of Physics, Guangdong Province Key Laboratory of Display Material and Technology, Sun Yat-sen University Guangzhou 510275 China
| | - Shaolin Zhang
- Solid State Physics & Material Research Laboratory, School of Physics and Materials Science, Guangzhou University Guangzhou 510006 China
- Research Center for Advanced Information Materials (CAIM), Huangpu Research and Graduate School of Guangzhou University Guangzhou 510555 China
| |
Collapse
|
3
|
Pourmadadi M, Yazdian F, Koulivand A, Rahmani E. Green synthesized polyvinylpyrrolidone/titanium dioxide hydrogel nanocomposite modified with agarose macromolecules for sustained and pH-responsive release of anticancer drug. Int J Biol Macromol 2023; 240:124345. [PMID: 37054860 DOI: 10.1016/j.ijbiomac.2023.124345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 03/28/2023] [Accepted: 04/02/2023] [Indexed: 04/15/2023]
Abstract
Cancer, as one of the most challenging diseases of the last century, has a significant number of patients and deaths every year. Various strategies have been explored for the treatment of cancer. Chemotherapy is one of the methods of treating cancer. Doxorubicin is one of the compounds used in chemotherapy to kill cancer cells. Due to their unique properties and low toxicity, metal oxide nanoparticles are effective in combination therapy and increase the effectiveness of anti-cancer compounds. The limited in vivo circulatory period, poor solubility, and inadequate penetration of doxorubicin (DOX) restrict its use in cancer treatment, notwithstanding its attractive characteristics. It is possible to circumvent some of the difficulties in cancer therapy by using green synthesized pH-responsive nanocomposite consisting of polyvinylpyrrolidone (PVP), titanium dioxide (TiO2) modified with agarose (Ag) macromolecules. TiO2 incorporation into the PVP-Ag nanocomposite resulted in limited increased loading and encapsulation efficiencies from 41 % to 47 % and 84 % to 88.5 %, respectively. DOX diffusion among normal cells is prevented by the PVP-Ag-TiO2 nanocarrier at pH = 7.4, though the acidic intracellular microenvironments activate the PVP-Ag-TiO2 nanocarrier at pH = 5.4. Characterization of the nanocarrier was performed using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectrophotometry, field emission scanning electron microscopy (FE-SEM), dynamic light scattering (DLS), and zeta potential. The average particle size and the zeta potential of the particles showed values of 349.8 nm and +57 mV, respectively. In vitro release after 96 h showed a release rate of 92 % at pH 7.4 and a release rate of 96 % at pH 5.4. Meanwhile, the initial release after 24 h was 42 % for pH 7.4 and 76 % for pH 5.4. As shown by an MTT analysis on MCF-7 cells, the toxicity of DOX-loaded PVP-Ag-TiO2 nanocomposite was substantially greater than that of unbound DOX and PVP-Ag-TiO2. After integrating TiO2 nanomaterials into the PVP-Ag-DOX nanocarrier, flow cytometry data showed a greater stimulation of cell death. These data indicate that the DOX-loaded nanocomposite is a suitable alternative for drug delivery systems.
Collapse
Affiliation(s)
- Mehrab Pourmadadi
- Department of Biotechnology, School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
| | - Fatemeh Yazdian
- Department of Life Science Engineering, Faculty of New Science and Technologies, University of Tehran, Tehran, Iran.
| | - Ali Koulivand
- Department of Life Science Engineering, Faculty of New Science and Technologies, University of Tehran, Tehran, Iran
| | - Erfan Rahmani
- Department of Biomedical Engineering, University of Delaware, Newark, DE, United States
| |
Collapse
|
4
|
Li Sip YY, Jacobs A, Morales A, Sun M, Roberson LB, Hummerick ME, Roy H, Kik P, Zhai L. Slippery lubricant-infused silica nanoparticulate film processing for anti-biofouling applications. J Appl Biomater Funct Mater 2023; 21:22808000231184688. [PMID: 37680075 DOI: 10.1177/22808000231184688] [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] [Indexed: 09/09/2023] Open
Abstract
Microbial biofilm build-up in water distribution systems can pose a risk to human health and pipe material integrity. The impact is more devastating in space stations and to astronauts due to the isolation from necessary replacement parts and medical resources. As a result, there is a need for coatings to be implemented onto the inner region of the pipe to minimize the adherence and growth of biofilms. Lubricant-infused surfaces has been one such interesting material for anti-biofouling applications in which their slippery property promotes repellence to many liquids and thus prevents bacterial adherence. Textured and porous films are suitable substrate candidates to infuse and contain the lubricant. However, there is little investigation in utilizing a nanoparticulate thin film as the substrate material for lubricant infusion. A nanoparticulate film has high porosity within the structure which can promote greater lubricant infusion and retention. The implementation as a thin film structure aids to reduce material consumption and cost. In our study, we utilized a well-studied nanoporous thin film fabricated via layer-by-layer assembly of polycations and colloid silica and then calcination for greater stability. The film was further functionalized to promote fluorinated groups and improve affinity with a fluorinated lubricant. The pristine nanoporous film was characterized to determine its morphology, thickness, wettability, and porosity. The lubricant-infused film was then tested for its lubricant layer stability upon various washing conditions and its performance against bacterial biofilm adherence as a result of its slippery property. Overall, the modified silica nanoparticulate thin film demonstrated potential as a base substrate for lubricant-infused surface fabrication that repelled against ambient aqueous solvents and as an anti-biofouling coating that demonstrated low biofilm coverage and colony forming unit values. Further optimization to improve lubricant retention or incorporation of a secondary function can aid in developing better coatings for biofilm mitigation.
Collapse
Affiliation(s)
- Yuen Yee Li Sip
- Department of Materials Science & Engineering, University of Central Florida, Orlando, FL, USA
| | - Annabel Jacobs
- Herbert Wertheim College of Engineering, University of Florida, Gainesville, FL, USA
| | - Alejandra Morales
- Engineering, Computer Programming and Technology Division, Valencia College, Orlando, FL, USA
| | - Mengdi Sun
- College of Optics and Photonics, University of Central Florida, Orlando, FL, USA
| | - Luke B Roberson
- Kennedy Space Center, National Aeronautics and Space Administration, Brevard County, FL, USA
| | | | - Herve Roy
- Burnett School of Biomedical Sciences, University of Central Florida, Orlando, FL, USA
| | - Pieter Kik
- College of Optics and Photonics, University of Central Florida, Orlando, FL, USA
| | - Lei Zhai
- Department of Chemistry and NanoScience Technology Center, University of Central Florida, Orlando, FL, USA
| |
Collapse
|
5
|
Lu KW, Lin YT, Wei HS, Kuo CC. Superhydrophilic Modification of Polycarbonate Substrate Surface by Organic Plasma Polymerization Film. MATERIALS 2022; 15:ma15134411. [PMID: 35806536 PMCID: PMC9267533 DOI: 10.3390/ma15134411] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/08/2022] [Accepted: 06/19/2022] [Indexed: 11/17/2022]
Abstract
Superhydrophilicity performs well in anti-fog and self-cleaning applications. In this study, polycarbonate substrate was used as the modification object because of the low surface energy characteristics of plastics. Procedures that employ plasma bombardment, such as etching and high surface free energy coating, are applied to improve the hydrophilicity. An organic amino silane that contains terminal amine group is introduced as the monomer to perform plasma polymerization to ensure that hydrophilic radicals can be efficiently deposited on substrates. Different levels of hydrophilicity can be reached by modulating the parameters of plasma bombardment and polymerization, such as plasma current, voltage of the ion source, and bombardment time. The surface of a substrate that is subjected to plasma bombarding at 150 V, 4 A for 5 min remained superhydrophilic for 17 days. After 40 min of Ar/O2 plasma bombardment, which resulted in a substrate surface roughness of 51.6 nm, the plasma polymerization of organic amino silane was performed by tuning the anode voltage and operating time of the ion source, and a water contact angle < 10° and durability up to 34 days can be obtained.
Collapse
|
6
|
Bruggeman K, Zhang M, Malagutti N, Soltani Dehnavi S, Williams R, Tricoli A, Nisbet D. Using UV-Responsive Nanoparticles to Provide In Situ Control of Growth Factor Delivery and a More Constant Release Profile from a Hydrogel Environment. ACS APPLIED MATERIALS & INTERFACES 2022; 14:12068-12076. [PMID: 35235309 DOI: 10.1021/acsami.1c24528] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Nanoparticles are popular delivery vehicles, but their diffusional release results in inconstant drug delivery. Here, we flatten the delivery profile into a more constant, zero-order profile. Brain-derived neurotrophic factor (BDNF) is attached to photoactive titanium dioxide nanoparticles and loaded into a nanofibrous self-assembling peptide (SAP) hydrogel. Different UV exposure conditions show three distinct profiles, including a counterintuitive decrease in release after UV exposure. We propose that the adsorption of the freed growth factor onto the hydrogel nanofibers affects release. Nanoparticles diffuse from the hydrogel readily, carrying the bound growth factor, but the freed growth factor (released from the nanoparticles by UV) instead interacts with─and is released less readily from─the hydrogel. UV shifts growth factor from nanoparticles to the hydrogel, therefore changing the diffusional release. Through midpoint UV exposure, we achieve a flattened delivery profile─unusual for diffusion─by changing in situ the amount of growth factor bound to the diffusing nanoparticles. With nanoparticle diffusion alone, we observed an increasing release profile with 36% of release in the first 6 h and 64% in the second 6 h. With midway UV exposure, this was controlled to 49 and 51%, respectively. The release of an unbound (soluble) control growth factor, glial cell-line derived neurotrophic factor (GDNF), was not affected by UV treatment, demonstrating the potential for independent control of temporal delivery profiles in a multiagent material.
Collapse
Affiliation(s)
- Kiara Bruggeman
- School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - Meng Zhang
- School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - Nicolo Malagutti
- School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - Shiva Soltani Dehnavi
- School of Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - Richard Williams
- iMPACT, School of Medicine, Deakin University, Waurn Ponds, VIC 3216, Australia
| | - Antonio Tricoli
- Nanotechnology Research Laboratory, Faculty of Engineering, The University of Sydney, Camperdown 2006, Australia
- Nanotechnology Research Laboratory, Research School of Chemistry, College of Science, The Australian National University, Canberra 2601, Australia
| | - David Nisbet
- The Graeme Clark Institute, The University of Melbourne, Melbourne 3010, Australia
- Department of Biomedical Engineering, Faculty of Engineering and Information Technology, The University of Melbourne, Melbourne 3010, Australia
- Laboratory of Advanced Biomaterials, Research School of Chemistry and the John Curtin School of Medical Research, The Australian National University, Canberra 2601, Australia
- Melbourne Medical School, Faculty of Medicine, Dentistry and Health Science, The University of Melbourne, Melbourne 3010, Australia
| |
Collapse
|
7
|
Motay M, Martel D, Vileno B, Soraru C, Ploux L, Méndez-Medrano MG, Colbeau-Justin C, Decher G, Keller N. Virtually Transparent TiO 2/Polyelectrolyte Thin Multilayer Films as High-Efficiency Nanoporous Photocatalytic Coatings for Breaking Down Formic Acid and for Escherichia coli Removal. ACS APPLIED MATERIALS & INTERFACES 2020; 12:55766-55781. [PMID: 33284584 DOI: 10.1021/acsami.0c13545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Virtually transparent photocatalytic multilayer films composed of TiO2 nanoparticles and polyelectrolytes were built on model surfaces using layer-by-layer assembly and investigated as photocatalytic nanoporous coatings. Formic acid (HCOOH) and Escherichia coli were used as models for the degradation of gaseous pollutants and for studying antibacterial properties. Positively charged TiO2 nanoparticles were coassembled with negatively charged poly(sodium 4-styrenesulfonate) (NaPSS) which leads to highly transparent nanoscale coatings in which the content of TiO2 particles is controlled mainly by the number of deposition cycles and the enhanced translucency with respect to titania powders is likely due to the presence of the polyelectrolytes in the interstitial space between the particles. Build-up and structural properties of the films were determined by ellipsometry, quartz crystal microbalance (QCM-D, with dissipation monitoring), and UV-vis spectrophotometry in transmission and scanning electron microscopy. Complementary photophysical and activity tests of (PSS/TiO2)n multilayer films were performed in the gas-phase under UV-A light and revealed a peculiar dependence on the number of layer pairs (LPs), corresponding to a clear deviation from the usual observations in photocatalysis with increasing TiO2 amounts. Most notably, a single LP film showed a strongly enhanced HCOOH mineralization and outperformed films with a higher number of LPs, with respect to the quantity of TiO2 catalyst present in the films. It is believed that the high quantum yield (8.1%) of a coating consisting of a single TiO2 layer which is 6-7 times higher than that of a 6-10 LP film could be due to the optimum accessibility of the TiO2 crystallites toward both HCOOH and water molecules. In thicker films, while no detrimental light screening was observed with increasing the number of LPs, diffusion phenomena could cap the efficiency of the access of the pollutant and water to the catalytic surface. Unlike for HCOOH mineralization, three PSS/TiO2 LPs were required for observing a maximum antibacterial activity of the nanocomposite coatings. This is likely due to the fact that micrometer-sized E. coli bacteria do not enter into the interstitial space between the TiO2 particles and require a different surface morphology with respect to the number of active contact points for optimum degradation.
Collapse
Affiliation(s)
- Marvin Motay
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES, CNRS, Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, France
- Institut Charles Sadron (UPR 22), CNRS, Université de Strasbourg, 23 rue de Loess, Strasbourg CEDEX 2 67034, France
| | - David Martel
- Institut Charles Sadron (UPR 22), CNRS, Université de Strasbourg, 23 rue de Loess, Strasbourg CEDEX 2 67034, France
| | - Bertrand Vileno
- Institut de Chimie, CNRS, Université de Strasbourg, CNRS, 1 rue Blaise Pascal, Strasbourg CEDEX 67008, France
| | - Charline Soraru
- Institut de Science des Matériaux de Mulhouse (IS2M, UMR7361 CNRS/Université de Haute Alsace), 15 rue Jean Starcky, 68057 Mulhouse, France
| | - Lydie Ploux
- Institut de Science des Matériaux de Mulhouse (IS2M, UMR7361 CNRS/Université de Haute Alsace), 15 rue Jean Starcky, 68057 Mulhouse, France
- Biomaterial Bioengineering (U1121 INSERM/Université de Strasbourg), 11 rue Humann, 67000 Strasbourg, France
| | | | | | - Gero Decher
- Institut Charles Sadron (UPR 22), CNRS, Université de Strasbourg, 23 rue de Loess, Strasbourg CEDEX 2 67034, France
| | - Nicolas Keller
- Institut de Chimie et Procédés pour l'Energie, l'Environnement et la Santé (ICPEES, CNRS, Université de Strasbourg), 25 rue Becquerel, 67087 Strasbourg, France
| |
Collapse
|
8
|
Bouriche R, Tazibet S, Boutillara Y, Melouki R, Benaliouche F, Boucheffa Y. Characterization of Titanium (IV) Oxide Nanoparticles Loaded onto Activated Carbon for the Adsorption of Nitrogen Oxides Produced from the Degradation of Nitrocellulose. ANAL LETT 2020. [DOI: 10.1080/00032719.2020.1829637] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Rachid Bouriche
- Institut National de Criminologie et de Criminalistique, Bouchaoui, Algiers, Algeria
- Unité d’Enseignement et de Recherche en Physico-chimie des Matériaux/Ecole Militaire Polytechnique, Algiers, Algeria
| | - Sana Tazibet
- Unité d’Enseignement et de Recherche en Physico-chimie des Matériaux/Ecole Militaire Polytechnique, Algiers, Algeria
| | - Yasmine Boutillara
- Unité d’Enseignement et de Recherche en Physico-chimie des Matériaux/Ecole Militaire Polytechnique, Algiers, Algeria
| | - Redouane Melouki
- Unité d’Enseignement et de Recherche en Physico-chimie des Matériaux/Ecole Militaire Polytechnique, Algiers, Algeria
| | - Fouad Benaliouche
- Unité d’Enseignement et de Recherche en Physico-chimie des Matériaux/Ecole Militaire Polytechnique, Algiers, Algeria
| | - Youcef Boucheffa
- Laboratoire d’Etude Physico-chimique des Matériaux et Application à l’Environnement, Université des Sciences et de la Technologie Houari Boumediene, Algeria El‑Alia, Bab‑Ezzouar, Algiers, Algeria
| |
Collapse
|
9
|
Poon C, Patel AA. Organic and inorganic nanoparticle vaccines for prevention of infectious diseases. NANO EXPRESS 2020. [DOI: 10.1088/2632-959x/ab8075] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
10
|
Zhu Z, Cai H, Sun D, Wang H. Photocatalytic effects on the quality of pork packed in the package combined with TiO2coated nonwoven fabrics. J FOOD PROCESS ENG 2019. [DOI: 10.1111/jfpe.12993] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Zhiwei Zhu
- School of Food Science and EngineeringSouth China University of Technology Guangzhou China
- Academy of Contemporary Food EngineeringSouth China University of Technology, Guangzhou Higher Education Mega Center Guangzhou China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain FoodsGuangzhou Higher Education Mega Center Guangzhou China
| | - Huanhuan Cai
- School of Food Science and EngineeringSouth China University of Technology Guangzhou China
- Academy of Contemporary Food EngineeringSouth China University of Technology, Guangzhou Higher Education Mega Center Guangzhou China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain FoodsGuangzhou Higher Education Mega Center Guangzhou China
| | - Da‐Wen Sun
- School of Food Science and EngineeringSouth China University of Technology Guangzhou China
- Academy of Contemporary Food EngineeringSouth China University of Technology, Guangzhou Higher Education Mega Center Guangzhou China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain FoodsGuangzhou Higher Education Mega Center Guangzhou China
- Food Refrigeration and Computerized Food Technology (FRCFT), Agriculture and Food Science CentreUniversity College Dublin, National University of Ireland Belfield Dublin 4 Ireland
| | - Hsiao‐Wen Wang
- School of Food Science and EngineeringSouth China University of Technology Guangzhou China
- Academy of Contemporary Food EngineeringSouth China University of Technology, Guangzhou Higher Education Mega Center Guangzhou China
- Engineering and Technological Research Centre of Guangdong Province on Intelligent Sensing and Process Control of Cold Chain FoodsGuangzhou Higher Education Mega Center Guangzhou China
| |
Collapse
|
11
|
Photocatalytic Graphene-TiO2 Thin Films Fabricated by Low-Temperature Ultrasonic Vibration-Assisted Spin and Spray Coating in a Sol-Gel Process. Catalysts 2017. [DOI: 10.3390/catal7050136] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
|
12
|
Boudot C, Kühn M, Kühn-Kauffeldt M, Schein J. Vacuum arc plasma deposition of thin titanium dioxide films on silicone elastomer as a functional coating for medical applications. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 74:508-514. [DOI: 10.1016/j.msec.2016.12.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Revised: 11/30/2016] [Accepted: 12/11/2016] [Indexed: 12/29/2022]
|
13
|
Tasnim N, Kumar A, Joddar B. Attenuation of the in vitro neurotoxicity of 316L SS by graphene oxide surface coating. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 73:788-797. [PMID: 28183673 PMCID: PMC5312756 DOI: 10.1016/j.msec.2016.12.123] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 12/07/2016] [Accepted: 12/22/2016] [Indexed: 12/17/2022]
Abstract
A persistent theme in biomaterials research comprises of surface engineering and modification of bare metallic substrates for improved cellular response and biocompatibility. Graphene Oxide (GO), a derivative of graphene, has outstanding chemical and mechanical properties; its large surface to volume ratio, ease of surface modification and processing make GO an attractive coating material. GO-coatings have been extensively studied as biosensors. Further owing to its surface nano-architecture, GO-coated surfaces promote cell adhesion and growth, making it suitable for tissue engineering applications. The need to improve the long-term durability and therapeutic effectiveness of commercially available bare 316L stainless steel (SS) surfaces led us to adopt a polymer-free approach which is cost-effective and scalable. GO was immobilized on to 316L SS utilizing amide linkage, to generate a strongly adherent uniform coating with surface roughness. GO-coated 316L SS surfaces showed increased hydrophilicity and biocompatibility with SHSY-5Y neuronal cells, which proliferated well and showed decreased reactive oxygen species (ROS) expression. In contrast, cells did not adhere to bare uncoated 316L SS meshes nor maintain viability when cultured in the vicinity of bare meshes. Therefore the combination of the improved surface properties and biocompatibility implies that GO-coating can be utilized to overcome pertinent limitations of bare metallic 316L SS implant surfaces, especially SS neural electrodes. Also, the procedure for making GO-based protective coatings can be applied to numerous other implants where the development of such protective films is necessary.
Collapse
Affiliation(s)
- Nishat Tasnim
- Department of Metallurgical, Materials Science and Biomedical Engineering, The University of Texas at El Paso, 500 W University Avenue, El Paso, TX 79968, USA
| | - Alok Kumar
- Department of Metallurgical, Materials Science and Biomedical Engineering, The University of Texas at El Paso, 500 W University Avenue, El Paso, TX 79968, USA
| | - Binata Joddar
- Department of Metallurgical, Materials Science and Biomedical Engineering, The University of Texas at El Paso, 500 W University Avenue, El Paso, TX 79968, USA.
| |
Collapse
|
14
|
Yu J, Han S, Hong JS, Sanyal O, Lee I. Synchronous Generation of Nano- and Microscaled Hierarchical Porous Polyelectrolyte Multilayers for Superwettable Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8494-500. [PMID: 27472150 DOI: 10.1021/acs.langmuir.6b01798] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
We created both a superhydrophilic polymer surface and a superhydrophobic surface by using the poly(acrylic acid) (PAA)/poly(allylamine hydrochloride) (PAH) multilayers with the synchronously generated hierarchical porous surface structures. The formation of surface and pore structures induced at acidic pH values is subject to the composition, distribution, and molecular weights of polyelectrolytes in the layer-by-layer (LbL) assembled film, leading to a variety of unique surface topographies and porous structures located on different scales. During the porous induction at pH 2.0, both nano- and microscaled features synchronously developed on the surface as a result of the unique combination of high-molecular-weight PAH (900K g/mol) and low molecular weight PAA (15K g/mol), along with a much reduced deposition time of 1 min. Although thermally cross-linked, the porous surface with hierarchical structure could achieve superhydrophilicity due to the remaining free amine and carboxylate groups on the porous structures. A complete switch from the superhydrophilic to the superhydrophobic surface was achieved via a simple chemical vapor deposition of trichloro(1H,1H,2H,2H-perfluoro-octyl)silane. In this work, the effects of molecular weight of polyelectrolytes (15K-900K g/mol), deposition time (10-900 s) during the LbL assembly, and pH (1.8 to 2.4) for the porous induction on the surface topography, pore structures, and wetting behavior were investigated in detail. A variety of unique porous surface structures on different length scales were systematically studied by controlling the above parameters.
Collapse
Affiliation(s)
- Jing Yu
- Department of Chemical Engineering and Materials Science, Michigan State University, Michigan State University , East Lansing, Michigan 48824, United States
| | - Songyang Han
- Department of Chemical Engineering and Materials Science, Michigan State University, Michigan State University , East Lansing, Michigan 48824, United States
| | - Joung Sook Hong
- Department of Chemical Engineering and Materials Science, Michigan State University, Michigan State University , East Lansing, Michigan 48824, United States
| | - Oishi Sanyal
- Department of Chemical Engineering and Materials Science, Michigan State University, Michigan State University , East Lansing, Michigan 48824, United States
| | - Ilsoon Lee
- Department of Chemical Engineering and Materials Science, Michigan State University, Michigan State University , East Lansing, Michigan 48824, United States
| |
Collapse
|
15
|
Fibrochondrocyte Growth and Functionality on TiO₂ Nanothin Films. J Funct Biomater 2016; 7:jfb7020015. [PMID: 27314395 PMCID: PMC4932472 DOI: 10.3390/jfb7020015] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2016] [Revised: 06/03/2016] [Accepted: 06/07/2016] [Indexed: 12/26/2022] Open
Abstract
Disorders affecting the temporomandibular joint (TMJ) are a long-standing health concern. TMJ disorders (TMJD) are often associated with an internal disc derangement accompanied by a suite of symptoms including joint noises, jaw dysfunction, and severe pain. The severity of patient symptoms and their reoccurrence can be alleviated to some extent with conservative therapy; however, refractory cases often require surgery that has shown only limited success. Bioengineered scaffolds with cell supportive surfaces an d nanoarchitectures that mimic TMJ tissue structure may offer an alternative treatment modality. In this study, titanium dioxide (TiO2) nanothin films, fabricated by layer-by-layer assembly, were examined as means for creating such a scaffold. The viability and growth of TMJ discal fibrochondrocytes (FCs) were assessed through MTT and DNA assays and total protein content over a 14-day experimental period. ELISA was also used to measure expression of types I and II collagen, decorin and aggrecan. Quantitative analyses demonstrated that FCs synthesized characteristic discal matrix proteins, with an increased production of type I collagen and decorin as opposed to collagen type II and aggrecan. A stimulatory effect on discal FC proliferation and extracellular matrix (ECM) expression with thicker nanofilms was also observed. The cumulative results suggest that TiO2 nanofilms may have potential as a TMJ scaffolding material.
Collapse
|
16
|
Pavasupree S, Dubas ST, Rangkupan R. Surface modification of polypropylene non-woven fibers with TiO2 nanoparticles via layer-by-layer self assembly method: Preparation and photocatalytic activity. J Environ Sci (China) 2015; 37:59-66. [PMID: 26574088 DOI: 10.1016/j.jes.2015.04.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 03/06/2015] [Accepted: 04/08/2015] [Indexed: 06/05/2023]
Abstract
Polypropylene (PP) meltblown fibers were coated with titanium dioxide (TiO2) nanoparticles using layer-by-layer (LbL) deposition technique. The fibers were first modified with 3 layers of poly(4-styrenesulfonic acid) (PSS) and poly(diallyl-dimethylammonium chloride) (PDADMAC) to improve the anchoring of the TiO2 nanoparticle clusters. PDADMAC, which is positively charged, was then used as counter polyelectrolyte in tandem with anionic TiO2 nanoparticles to construct TiO2/PDADMAC bilayer in the LbL fashion. The number of deposited TiO2/PDADMAC layers was varied from 1 to 7 bilayer, and could be used to adjust TiO2 loading. The LbL technique showed higher TiO2 loading efficiency than the impregnation approach. The modified fibers were tested for their photocatalytic activity against a model dye, Methylene Blue (MB). Results showed that the TiO2 modified fibers exhibited excellent photocatalytic activity efficiency similar to that of TiO2 powder dispersed in solution. The deposition of TiO2 3 bilayer on the PP substrate was sufficient to produce nanocomposite fibers that could bleach the MB solution in less than 4hr. TiO2-LbL constructions also preserved TiO2 adhesion on substrate surface after 1cycle of photocatalytic test. Successive photocatalytic test showed decline in MB reduction rate with loss of TiO2 particles from the substrate outer surface. However, even in the third cycle, the TiO2 modified fibers are still moderately effective as it could remove more than 95% of MB after 8hr of treatment.
Collapse
Affiliation(s)
- Suttipan Pavasupree
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand.
| | - Stephan T Dubas
- Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand
| | - Ratthapol Rangkupan
- Metallurgy and Materials Science Research Institute, Chulalongkorn University, Bangkok 10330, Thailand; Chulalongkorn University, Nanotec-CU Center of Excellence on Food and Agriculture, Chulalongkorn University, Bangkok 10330, Thailand.
| |
Collapse
|
17
|
Lamberti A, Virga A, Rivolo P, Angelini A, Giorgis F. Easy Tuning of Surface and Optical Properties of PDMS Decorated by Ag Nanoparticles. J Phys Chem B 2015; 119:8194-200. [DOI: 10.1021/acs.jpcb.5b02581] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrea Lamberti
- Department of Applied Science
and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Alessandro Virga
- Department of Applied Science
and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Paola Rivolo
- Department of Applied Science
and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Angelo Angelini
- Department of Applied Science
and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| | - Fabrizio Giorgis
- Department of Applied Science
and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
| |
Collapse
|
18
|
Carré G, Garnier L, Moeller-Siegert J, Gies JP, Keller V, André P, Keller N. Antibacterial textiles functionalized by layer-by-layer assembly of polyelectrolytes and TiO2photocatalyst. RSC Adv 2015. [DOI: 10.1039/c5ra05541e] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Abstract
Antibacterial photocatalytic textiles with high self-decontaminating activity under solar light againstE. colihave been prepared by sprayed layer-by-layer assembly of TiO2and polyethylenimine or polyanionic poly(styrene sulfonate) polyelectrolyte.
Collapse
Affiliation(s)
- Gaëlle Carré
- Institut de Chimie et Procédés pour l'Energie
- l'Environnement et la Santé (ICPEES)
- CNRS and Strasbourg University
- 67087 Strasbourg Cedex
- France
| | - Laurent Garnier
- Laboratoire de Biophotonique et Pharmacologie
- CNRS and Strasbourg University
- 67400 Illkirch
- France
| | - Janina Moeller-Siegert
- Institut de Chimie et Procédés pour l'Energie
- l'Environnement et la Santé (ICPEES)
- CNRS and Strasbourg University
- 67087 Strasbourg Cedex
- France
| | - Jean-Pierre Gies
- Laboratoire de Biophotonique et Pharmacologie
- CNRS and Strasbourg University
- 67400 Illkirch
- France
| | - Valérie Keller
- Institut de Chimie et Procédés pour l'Energie
- l'Environnement et la Santé (ICPEES)
- CNRS and Strasbourg University
- 67087 Strasbourg Cedex
- France
| | - Philippe André
- Laboratoire de Biophotonique et Pharmacologie
- CNRS and Strasbourg University
- 67400 Illkirch
- France
| | - Nicolas Keller
- Institut de Chimie et Procédés pour l'Energie
- l'Environnement et la Santé (ICPEES)
- CNRS and Strasbourg University
- 67087 Strasbourg Cedex
- France
| |
Collapse
|
19
|
Karnik S, Hines K, Mills DK. Nanoenhanced hydrogel system with sustained release capabilities. J Biomed Mater Res A 2014; 103:2416-26. [PMID: 25424733 DOI: 10.1002/jbm.a.35376] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 11/04/2014] [Accepted: 11/19/2014] [Indexed: 01/24/2023]
Abstract
An alginate/halloysite nanotube (HNT) nanocomposite was developed with sustained release of bone morphogenetic proteins (BMPs) at picogram low levels. BMP-2, 4, and 6 and osteoblasts were chosen as our model "growth factor" and "cell type" as the interaction of BMPs with osteoblasts is well known and thoroughly investigated. Alginate hydrogels with HNTs doped with BMP-2, 4, or 6 only or BMP-4 and 6 in combination. Osteoblasts were seeded within the hydrogels and studied for changes in cell proliferation, phenotypic expression, and mineralization over a 28-day experimental period. Osteoblast behavior was enhanced in BMP doped hydrogel/HNTs nanocomposites as compared with control groups. Release profiles showed that BMP-2 was released in a sustained fashion over a 7-day period and at picogram levels. Mineralization, as showed by Von Kossa staining, and protein synthesis peaked at 28 days, for all three growth factor combinations. BMP-4 provided a marked stimulus for osteoblast functionality base and was comparable to BMP-6 in terms of osteoblast differentiation and mineralization. BMP-4 and 6, in combination, showed a marked enhancement in osteoblast differentiation and functionality; however, the response seemed to be delayed when compared with BMP-4 and 6 release. Hydrogel surfaces had a complex surface topography and greater structural integrity with increased halloysite addition. The data suggest that these nanocomposites may provide a mechanism to enhance repair and regeneration in damaged or diseased tissues, reducing the need for more invasive treatment modalities.
Collapse
Affiliation(s)
- Sonali Karnik
- Center for Biomedical Engineering and Rehabilitation Science, Louisiana Tech University, Ruston, Louisiana, 71272
| | - Kanesha Hines
- Center for Biomedical Engineering and Rehabilitation Science, Louisiana Tech University, Ruston, Louisiana, 71272
| | - David K Mills
- Center for Biomedical Engineering and Rehabilitation Science, Louisiana Tech University, Ruston, Louisiana, 71272.,The School of Biological Sciences, Louisiana Tech University, Ruston, Louisiana, 71272
| |
Collapse
|
20
|
Lowe TC, A Reiss R. Understanding the biological responses of nanostructured metals and surfaces. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1757-899x/63/1/012172] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
21
|
Logar M, Bračko I, Potočnik A, Jančar B. Cu and CuO/titanate nanobelt based network assemblies for enhanced visible light photocatalysis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:4852-4862. [PMID: 24697758 DOI: 10.1021/la5008704] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
3D network configurations of copper(II) oxide/titanate nanobelt (CuO/TiNBs) and copper/titanate nanobelt (Cu/TiNBs) were formed using a two-step polyelectrolyte-assisted synthesis and assembly approach. The photoactivity of the TiNB/CuO and Cu/TiNB composite networks is significantly enhanced as compared to the activity of 3D structures formed of pristine TiNB. An efficient, UV-vis-light-induced electron transfer at the two-component interface achieved by the intimate coupling of TiNB with p-type semiconducting CuO and plasmonic Cu nanoparticles in composite heterostructures facilitates control over the system's exciton dynamics, which results in highly efficient UV-vis photocatalytic performance of heterostructures. The superior photocatalytic activity of the metal and semiconductor/semiconductor nanocomposite structures in the visible region is discussed, highlighting the role of interfacial electron-charge transfer (IFCT) in semiconductor-semiconductor (CuO/TiNB) and surface plasmon resonance (SPR) of Cu nanoparticles in metal-semiconductor heterostructures.
Collapse
Affiliation(s)
- Manca Logar
- Department of Materials Science and Engineering, Stanford University , Stanford, California 94305, United States
| | | | | | | |
Collapse
|
22
|
Yang M, Di Z, Lee JK. Facile control of surface wettability in TiO2/poly(methyl methacrylate) composite films. J Colloid Interface Sci 2012; 368:603-7. [DOI: 10.1016/j.jcis.2011.11.037] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2011] [Revised: 11/14/2011] [Accepted: 11/17/2011] [Indexed: 10/14/2022]
|
23
|
Dissette V, Bozzi P, Bignozzi CA, Dalpiaz A, Ferraro L, Beggiato S, Leo E, Vighi E, Pasti L. Particulate adducts based on sodium risedronate and titanium dioxide for the bioavailability enhancement of oral administered bisphosphonates. Eur J Pharm Sci 2010; 41:328-36. [DOI: 10.1016/j.ejps.2010.06.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2010] [Revised: 06/04/2010] [Accepted: 06/29/2010] [Indexed: 11/17/2022]
|
24
|
Gill R, Mazhar M, Félix O, Decher G. Covalent Layer-by-Layer Assembly and Solvent Memory of Multilayer Films from Homobifunctional Poly(dimethylsiloxane). Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200907161] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
25
|
Gill R, Mazhar M, Félix O, Decher G. Covalent Layer-by-Layer Assembly and Solvent Memory of Multilayer Films from Homobifunctional Poly(dimethylsiloxane). Angew Chem Int Ed Engl 2010; 49:6116-9. [DOI: 10.1002/anie.200907161] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
26
|
Yashchenok AM, Gorin DA, Badylevich M, Serdobintsev AA, Bedard M, Fedorenko YG, Khomutov GB, Grigoriev DO, Möhwald H. Impact of magnetite nanoparticle incorporation on optical and electrical properties of nanocomposite LbL assemblies. Phys Chem Chem Phys 2010; 12:10469-75. [PMID: 20602000 DOI: 10.1039/c004242k] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Optical and electrical properties of polyelectrolyte/iron oxide nanocomposite planar films on silicon substrates were investigated for different amount of iron oxide nanoparticles incorporated in the films. The nanocomposite assemblies prepared by the layer-by-layer assembly technique were characterized by ellipsometry, atomic force microscopy, and secondary ion mass-spectrometry. Absorption spectra of the films reveal a shift of the optical absorption edge to higher energy when the number of deposited layers decreases. Capacitance-voltage and current-voltage measurements were applied to study the electrical properties of metal-oxide-semiconductor structures prepared by thermal evaporation of gold electrodes on nanocomposite films. The capacitance-voltage measurements show that the dielectric constant of the film increases with the number of deposited layers and the fixed charge and the trapped charge densities have a negative sign.
Collapse
Affiliation(s)
- Alexey M Yashchenok
- Faculty of Nano- and Biomedical Technologies, Saratov State University, Saratov 410012, Russia
| | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Ex vivo expansion of human circulating myogenic progenitors on cluster-assembled nanostructured TiO2. Biomaterials 2010; 31:5385-96. [PMID: 20398929 DOI: 10.1016/j.biomaterials.2010.03.021] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2009] [Accepted: 03/09/2010] [Indexed: 01/22/2023]
Abstract
Ex vivo expansion of hematopoietic stem cells has been explored in the fields of stem cell biology, gene therapy and clinical transplantation. Recently, we demonstrated the existence of a circulating myogenic progenitor expressing the CD133 antigen. The relative inability of circulating CD133+ stem cells to reproduce themselves ex vivo imposes substantial limitations on their use for clinical applications in muscular dystrophies. Here we report that the use of cluster-assembled nanostructured titanium dioxide (ns-TiO(2)) substrates, in combination with cytokine enriched medium, enables high-level expansion of circulating CD133+ stem cells in vitro. Furthermore, we demonstrate that expanded circulating CD133+ stem cells retain their in vitro capacity to differentiate into myogenic cells. The exploitation of cluster-assembled ns-TiO(2) substrates for the expansion of CD133+ stem cells in vitro could therefore make the clinical application of these stem cells for the treatment of muscle diseases practical.
Collapse
|
28
|
Stefanou E, Evangelou A, Falaras P. Effects of UV-irradiated titania nanoparticles on cell proliferation, cancer metastasis and promotion. Catal Today 2010. [DOI: 10.1016/j.cattod.2010.02.016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
29
|
Gorin DA, Yashchenok AM, Manturov AO, Kolesnikova TA, Möhwald H. Effect of layer-by-layer electrostatic assemblies on the surface potential and current voltage characteristic of metal-insulator-semiconductor structures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:12529-12534. [PMID: 19795820 DOI: 10.1021/la901379d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In the present Article, the Kelvin probe method for surface potential measurement is introduced to study polyelectrolyte multilayer coatings deposited on silicon plates. Metal-insulator-semiconductor (MIS) structures with polyelectrolyte layers as insulator were fabricated. The polyelectrolyte layer deposition on the surface of silicon plates led to a change of the current-voltage characteristics connected with resistance changes of the MIS structures. Poly(ethylenimine) (PEI) monolayer formation resulted in resistance decrease, and the following increase of the polyelectrolyte layer number led to MIS structure resistance increase. The results are interpreted as an interplay between accumulation of majority carriers (electrons) near the semiconductor surface and resistance increase due to insulating polyelectrolyte adsorption, and both effects can be discriminated by varying the polyelectrolyte layer thickness.
Collapse
Affiliation(s)
- D A Gorin
- Department of Interfaces, Max-Planck Institute of Colloids and Interfaces, Golm/Potsdam D14476, Germany.
| | | | | | | | | |
Collapse
|
30
|
Ramanathan M, Luckarift HR, Sarsenova A, Wild JR, Ramanculov EK, Olsen EV, Simonian AL. Lysozyme-mediated formation of protein–silica nano-composites for biosensing applications. Colloids Surf B Biointerfaces 2009; 73:58-64. [DOI: 10.1016/j.colsurfb.2009.04.024] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 04/24/2009] [Accepted: 04/28/2009] [Indexed: 10/20/2022]
|
31
|
Grigoriev D, Gorin D, Sukhorukov GB, Yashchenok A, Maltseva E, Möhwald H. Polyelectrolyte/magnetite nanoparticle multilayers: preparation and structure characterization. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:12388-12396. [PMID: 17958452 DOI: 10.1021/la700963h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Polyelectrolyte composite planar films containing a different number of iron oxide (Fe3O4) nanoparticle layers have been prepared using the layer-by-layer adsorption technique. The nanocomposite assemblies were characterized by ellipsometry, UV-vis spectroscopy, and AFM. Linear growth of the multilayer thickness with the increase of the layer number, N, up to 12 reflects an extensive character of this parameter in this range. A more complicated behavior of the refractive index is caused by changes in the multilayer structure, especially for the thicker nanocomposites. A quantitative analysis of the nanocomposite structure is provided comparing a classical and a modified effective medium approach taking into account the influence of light absorption by the Fe3O4 nanoparticles on the complex refractive index of the nanocomposite and contributions of all components to film thickness. Dominant influence of co-adsorbed water on their properties was found to be another interesting peculiarity of the nanocomposite film. This effect, as well as possible film property modulation by light, is discussed.
Collapse
Affiliation(s)
- D Grigoriev
- Max-Planck Institute of Colloids and Interfaces, Golm/Potsdam, Germany.
| | | | | | | | | | | |
Collapse
|
32
|
Kniprath R, Duhm S, Glowatzki H, Koch N, Rogaschewski S, Rabe JP, Kirstein S. Internal structure of nanoporous TiO2/polyion thin films prepared by layer-by-layer deposition. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:9860-5. [PMID: 17696454 DOI: 10.1021/la700385v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The internal structure of porous TiO2 films prepared by electrostatic layer-by-layer deposition was investigated. The films were prepared by alternate dipping of solid substrates into dispersions of TiO2 nanoparticles and polycations, polyanions, or pure buffer solution, respectively. The surface charge of the amphoteric TiO2 particles was controlled by the pH of the aqueous dispersions. The morphology of the film surface was investigated by means of scanning electron microscopy. It was found that the surface roughness strongly depends on the polymeric material used for the deposition process but is independent of the ionic strength of the solution or the molecular weight of the polyions. The samples with rough surfaces feature strong light scattering. The porosity and internal structure of the TiO2/polyelectrolyte films were investigated by adsorption/desorption of dye molecules. A crude estimate yields an internal surface that is up to 160 times the plane surface of the substrate for a film thickness of 1 microm. The composition of the films was investigated by X-ray photoelectron spectroscopy (XPS). Detection of the XPS signal after each deposition step of the first three dipping cycles shows a significant increase of the relative surface coverage of Ti after the TiO2 deposition step and of PSS after the PSS deposition step. For later dipping cycles, such an increase was also detectable but less prominent.
Collapse
Affiliation(s)
- R Kniprath
- Department of Physics, Humboldt University Berlin, Newtonstrasse 15, 12489 Berlin, Germany
| | | | | | | | | | | | | |
Collapse
|
33
|
Wu Z, Lee D, Rubner MF, Cohen RE. Structural color in porous, superhydrophilic, and self-cleaning SiO2/TiO2 Bragg stacks. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2007; 3:1445-51. [PMID: 17583907 DOI: 10.1002/smll.200700084] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Thin-film Bragg stacks exhibiting structural color have been fabricated by a layer-by-layer (LbL) deposition process involving the sequential adsorption of nanoparticles and polymers. High- and low-refractive-index regions of quarter-wave stacks were generated by calcining LbL-assembled multilayers containing TiO(2) and SiO(2) nanoparticles, respectively. The physical attributes of each region were characterized by a recently developed ellipsometric method. The structural color characteristics of the resultant nanoporous Bragg stacks could be precisely tuned in the visible region by varying the number of stacks and the thickness of the high- and low-refractive-index stacks. These Bragg stacks also exhibited potentially useful superhydrophilicity and self-cleaning properties.
Collapse
Affiliation(s)
- Zhizhong Wu
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
| | | | | | | |
Collapse
|
34
|
Varahramyan K, Lvov Y. Nanomanufacturing by layer-by-layer assembly - from nanoscale coating to device applications. ACTA ACUST UNITED AC 2007. [DOI: 10.1243/17403499jnn47] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Layer-by-layer (LbL) assembly is emerging as a key nanomanufacturing technique that is finding a broad range of applications. It is a versatile, simple, and easy to use technique, allowing the realization of novel nanometer-scale multi-layered materials and structures that can be made to have highly desirable properties, including chemical, mechanical, electrical, magnetic, thermal, and optical. The present paper discusses the LbL assembly technique and its applications, including for nanoelectromechanical systems (NEMS) and micro-electromechanical systems (MEMS) (in combination with microfabrication), for biocompatible coating, for nanoengineered capsules, for pulp microfibre nanocoating to obtain better paper, and for polymer-based electronic devices.
Collapse
Affiliation(s)
- K Varahramyan
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana, USA
| | - Y Lvov
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana, USA
| |
Collapse
|
35
|
Amplification of antigen–antibody interactions via back-filling of HRP on the layer-by-layer self-assembling of thionine and gold nanoparticles films on Titania nanoparticles/gold nanoparticles-coated Au electrode. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2007.02.027] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
36
|
Gan WY, Lam SW, Chiang K, Amal R, Zhao H, Brungs MP. Novel TiO2 thin film with non-UV activated superwetting and antifogging behaviours. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b618280a] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
37
|
|
38
|
Kommireddy DS, Sriram SM, Lvov YM, Mills DK. Stem cell attachment to layer-by-layer assembled TiO2 nanoparticle thin films. Biomaterials 2006; 27:4296-303. [PMID: 16647115 DOI: 10.1016/j.biomaterials.2006.03.042] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2005] [Accepted: 03/08/2006] [Indexed: 10/24/2022]
Abstract
Surface topography is one of the most important factors influencing the attachment and spreading of cells. In the present study, layer-by-layer assembled titanium dioxide (TiO2) nanoparticle thin films were chosen for attachment, proliferation and spreading studies on mouse mesenchymal stem cells (MSC). Increasing surface roughness was observed with increasing number of layer-by-layer assembled TiO2 thin films. Four layer TiO2 thin film showed higher number of attached cells than a one layer thin film and control surfaces. MSCs experienced no cytotoxic effects after culture on the TiO2 coated substrates as observed from the cytotoxicity tests. Cell spreading, visualized with scanning electron microscopy, showed a faster rate of spreading on a rougher surface. Cells on a four-layer substrate, at 12 h showed complete spreading, where as most of the cells on a control surface and a one-layer surface, at 24 h, retained a rounded morphology. In conclusion, TiO2 nanoparticle thin films were successfully assembled in alternation with polyelectrolytes and in-vitro studies with MSC showed an increase in the attachment and faster spreading of cells on rougher surfaces.
Collapse
Affiliation(s)
- Dinesh S Kommireddy
- Institute for Micromanufacturing, Louisiana Tech University, 911 Hergot Avenue, Ruston, LA 71272, USA
| | | | | | | |
Collapse
|
39
|
Andreeva DV, Gorin DA, Shchukin DG, Sukhorukov GB. Magnetic Microcapsules with Low Permeable Polypyrrole Skin Layer. Macromol Rapid Commun 2006. [DOI: 10.1002/marc.200600111] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
40
|
Cebeci FC, Wu Z, Zhai L, Cohen RE, Rubner MF. Nanoporosity-driven superhydrophilicity: a means to create multifunctional antifogging coatings. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:2856-62. [PMID: 16519495 DOI: 10.1021/la053182p] [Citation(s) in RCA: 128] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Multifunctional nanoporous thin films have been fabricated from layer-by-layer assembled silica nanoparticles and a polycation. The resultant multilayer films were found to exhibit both antifogging and antireflection properties. The antifogging properties are a direct result of the development of superhydrophilic wetting characteristics (water droplet contact angle <5 degrees within 0.5 s or less). The nearly instantaneous sheetlike wetting promoted by the superhydrophilic multilayer prevents light scattering water droplets from forming on a surface. The low refractive index of the multilayer film (as low as 1.22) resulting from the presence of nanopores was found to impart excellent antireflection properties. Glass slides coated on both sides with a nanoporous multilayer film exhibited transmission levels as high as 99.8%. Stable superhydrophilic wetting characteristics were obtained only after a critical number of bilayers were deposited onto a surface. The assembly conditions (solution pH and nanoparticle concentration), as well as the choice of nanoparticle size, were found to strongly influence film properties. It is suggested that the superhydrophilic behavior is driven by the rapid infiltration of water into a 3D nanoporous network created under specific assembly conditions.
Collapse
Affiliation(s)
- Fevzi C Cebeci
- Department of Materials Science and Engineering and Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | | | | | | | | |
Collapse
|