TiO2 Nanoparticles and Epoxy-TiO2 Nanocomposites: A Review of Synthesis, Modification Strategies, and Photocatalytic Potentialities

Ali, Nisar; Ali, Farman; Khurshid, Rafaqat; Ikramullah, Ikramullah; Ali, Zarshad; Afzal, Adeel; Bilal, Muhammad; Iqbal, Hafiz M.N.; Ahmad, Iftikhar

doi:10.1007/s10904-020-01668-6

Cited by 32 publications

(14 citation statements)

References 167 publications

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“… Wang et al, 2020 ). The other process, hydrothermal treatment, was to prepare titanium oxide layer with nanotopography via surface crystallization procedure within an elevated temperature and aqueous media ( Ali et al, 2020 ; Bencina et al, 2020 ). However, these techniques strongly depended on specific apparatus like electrochemical reactors or tefion-lined autoclaves.…”

Section: Discussionmentioning

confidence: 99%

Enhanced Osseointegration by the Hierarchical Micro-Nano Topography on Selective Laser Melting Ti-6Al-4V Dental Implants

Shu

Zhang

Sun

et al. 2021

Front. Bioeng. Biotechnol.

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Currently, selective laser melting (SLM) has been thriving in implant dentistry for on-demand fabricating dental implants. Based on the coarse microtopography of SLM titanium surfaces, constructing nanostructure to form the hierarchical micro-nano topography is effective in enhancing osseointegration. Given that current nanomodification techniques of SLM implants, such as anodization and hydrothermal treatment, are facing the inadequacy in costly specific apparatus and reagents, there has been no recognized nanomodified SLM dental implants. The present study aimed to construct hierarchical micro-nano topography on self-made SLM dental implants by a simple and safe inorganic chemical oxidation, and to evaluate its contribution on osteoblastic cells bioactivity and osseointegration. The surface chemical and physical parameters were characterized by FE-SEM, EDS, profilometer, AFM, and contact angle meter. The alteration on bioactivity of MG-63 human osteoblastic cells were detected by qRT-PCR. Then the osseointegration was assessed by implanting implants on the femur condyle of New Zealand Rabbits. The hierarchical micro-nano topography was constituted by the microrough surface of SLM implants and nanoneedles (diameter: 20∼50 nm, height: 150∼250 nm), after nanomodifying SLM implants in 30% hydrogen peroxide and 30% hydrochloride acid (volume ratio 1:2.5) at room temperature for 36 h. Low chemical impurities content and high hydrophilicity were observed in the nanomodified group. Cell experiments on the nanomodified group showed higher expression of mitophagy related gene (PINK1, PARKIN, LC3B, and LAMP1) at 5 days and higher expression of osteogenesis related gene (Runx2 and OCN) at 14 days. In the early stage of bone formation, the nanomodified SLM implants demonstrated higher bone-to-implant contact. Intriguingly, the initial bone-to-implant contact of nanomodified SLM implants consisted of more mineralized bone with less immature osteoid. After the cessation of bone formation, the bone-to-implant contact of nanomodified SLM implants was equal to untreated SLM implants and marketable TixOs implants. The overall findings indicated that the inorganic chemical oxidized hierarchical micro-nano topography could enhance the bioactivity of osteoblastic cells, and consequently promote the peri-implant bone formation and mineralization of SLM dental implants. This study sheds some light on improvements in additive manufactured dental implants.

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Section: Discussionmentioning

confidence: 99%

Enhanced Osseointegration by the Hierarchical Micro-Nano Topography on Selective Laser Melting Ti-6Al-4V Dental Implants

Shu

Zhang

Sun

et al. 2021

Front. Bioeng. Biotechnol.

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“…Recently, CNCs have been reported as sustainable biosource material, which serve as a valuable colloidal stabilizer [34,35]. They have attracted a dynamic attention in developing and high-performance nano-composites due to their mechanical performance [36,37]. CNCs materials have wide applications due to their unusual properties such as high speci c surface area, static mechanical properties and permeability [38,39].…”

Section: Introductionmentioning

confidence: 99%

Enhancement in Adhesive and Thermal Properties of Bio‐based Epoxy Resin by Using Eugenol Grafted Cellulose Nanocrystals

Aziz

Zheng

Jamil

et al. 2021

J Inorg Organomet Polym

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Bio-based epoxy resins are being used due to their green chemistry. They have better properties than petroleum-based epoxy resins. Recently, environment friendly nanomaterials have been used for different industrial applications. Cellulose nanocrystals (CNCs) are among the best naturally occurring materials.Therefore, the surface of cellulose nanocrystals are modi ed by eugenol-based silane coupling agent (EBSCA). Chemical composition and surface morphologies of CNCs were analyzed and characterized by FTIR, AFM, SEM, TEM and 1 H-NMR. The SEM and AFM results con rmed eugenol-based silane coupling agent was successfully grafted on cellulose nanocrystals. Modi ed CNCs demonstrated an excellent tensile strength (2190 MPa) and modulus (16.00 MPa), as well as storage modulus (1622 MPa) exhibited by 1wt% modi ed cellulose nanocrystals composites. Additionally, modi ed CNCs displayed hydrophobic behavior (CA=102 ± 2°). The corresponding modi ed CNCs have signi cant applications in combination of high stiffness and strength to the epoxy resins. This study lays a foundation towards full bio-based, environment friendly polymers fabrication and consumptions most desirable in adhesive and mechanical industrial elds.

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“…Photoinitiators are an alternative to traditional initiators of radical polymerization process. The photocatalytic water splitting with the formation of hydrogen and organic compounds decomposition in aqueous solutions to carbon dioxide and water suggest either direct interaction with reactive hydroxyl radicals formed as a result of complex transformations of electron-hole pairs, or with oxidizing centers on the photocatalyst surface [1][2][3][4][5][6][7][8][9][10]. The formation of an active hydroxyl radical in the reaction system is of interest for organic synthesis, primarily for the production of new polymer materials without material initiators fragments with organic nature [9,11].…”

Section: Introductionmentioning

confidence: 99%

Features of Polymerization of Methyl Methacrylate using a Photocatalyst—the Complex Oxide RbTe1.5W0.5O6

Семенычева

Chasova

Matkivskaya

et al. 2021

J Inorg Organomet Polym

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Radical polymerization of methylmethacrylate in an aqueous emulsion was carried out using the complex oxide RbTe1.5W0.5O6 as a photoinitiator under visible light irradiation with λ= 400-700 nm. Studies of the process and reaction products using modern methods of physical and chemical analysis (GPC, IR, NMR, etc.) have shown that several directions of monomer transformations occur simultaneously in the reaction mixture. Polymethylmethacrylate, produced in the organic phase and characterized by Mn ~ 140-145 kDa, is a result of polymerization initiation by a hydroxyl radical formed due to complex transformations of electron-hole pairs during irradiation of the photocatalyst. Moreover, the interaction of the hydroxyl radical with OH groups on the complex oxide RbTe1.5W0.5O6 surface and the subsequent formation of oxygen-centered radicals lead to grafting polymer macromolecules onto the photocatalyst surface. In addition, methylmethacrylate is able to oxidize to a cyclic dimer with terminal double bonds and then form a polymer with cyclic dimer links due to coordination by double bonds on the complex oxide RbTe1.5W0.5O6 surface. The high activity of the hydroxyl radical made it possible to obtain the graft copolymer PMMA-pectin by grafting the polymer product onto the surface of the natural polymer-pectin. Comparison of the sponge morphology of the graft copolymer PMMA-pectin and the initial pectin samples using the scanning electron microscopy method showed a noticeable difference in their structural and topological organization. This fact is especially interesting in terms of studying the properties of the graft copolymer as a material for the scaffolds.

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TiO2 Nanoparticles and Epoxy-TiO2 Nanocomposites: A Review of Synthesis, Modification Strategies, and Photocatalytic Potentialities

Cited by 32 publications

References 167 publications

Enhanced Osseointegration by the Hierarchical Micro-Nano Topography on Selective Laser Melting Ti-6Al-4V Dental Implants

Enhanced Osseointegration by the Hierarchical Micro-Nano Topography on Selective Laser Melting Ti-6Al-4V Dental Implants

Enhancement in Adhesive and Thermal Properties of Bio‐based Epoxy Resin by Using Eugenol Grafted Cellulose Nanocrystals

Features of Polymerization of Methyl Methacrylate using a Photocatalyst—the Complex Oxide RbTe1.5W0.5O6

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