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calcium silicate nanoparticles

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https://www.readbyqxmd.com/read/29052468/evaluation-of-the-content-of-tio2-nanoparticles-in-the-coatings-of-chewing-gums
#1
William Dudefoi, Hélène Terrisse, Aurelian Florin Popa, Eric Gautron, Bernard Humbert, Marie-Hélène Ropers
Titanium dioxide is a metal oxide used as a white pigment in many food categories, including confectionery. Due to differences in the mass fraction of nanoparticles contained in TiO2, the estimated intakes of TiO2 nanoparticles differ by a factor of 10 in the literature. To resolve this problem, a better estimation of the mass of nanoparticles present in food products is needed. In this study, we focused our efforts on chewing gum, which is one of the food products contributing most to the intake of TiO2. The coatings of four kinds of chewing gum, where the presence of TiO2 was confirmed by Raman spectroscopy, were extracted in aqueous phases...
October 20, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/29031416/zinc-silicate-mineral-coated-scaffold-improved-in-vitro-osteogenic-differentiation-of-equine-adipose-derived-mesenchymal-stem-cells
#2
Behnaz Bageshlooyafshar, Saeid Vakilian, Mousa Kehtari, Tarlan Eslami-Arshaghi, Farjad Rafeie, Rouhallah Ramezanifard, Reza Rahchamani, Abdollah Mohammadi-Sangcheshmeh, Yousef Mostafaloo, Ehsan Seyedjafari
In current study we aimed to coat the PLLA scaffold with zinc (Zn) silicate mineral nanoparticles. Then, using equine adipose-derived stem cells (ASCs) we intended to compare the osteogenic induction potency of Zn silicate mineral-coated PLLA scaffold with uncoated PLLA scaffold and tissue culture plastic (TCPS). Adipose tissues were collected from 3 horses, and isolation of ASCs was achieved by enzymatic digestion. PLLA scaffold was successfully prepared using a phase separation method and coated with Zn silicate mineral nanoparticles...
September 18, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28991434/biomimetic-strong-tough-and-self-healing-composites-using-universal-sealant-loaded-porous-building-blocks
#3
Sung Hoon Hwang, Joseph B Miller, Rouzbeh Shahsavari
Many natural materials, such as nacre and dentin, exhibit multifunctional mechanical properties via structural interplay between compliant and stiff constituents arranged in a particular architecture. Herein, we present, for the first time, the bottom-up synthesis and design of strong, tough, and self-healing composite using simple but universal spherical building blocks. Our composite system is composed of calcium silicate porous nanoparticles with unprecedented monodispersity over particle size, particle shape, and pore size, which facilitate effective loading and unloading with organic sealants, resulting in 258% and 307% increases in the indentation hardness and elastic modulus of the compacted composite...
October 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28917149/a-comparison-study-between-electrospun-polycaprolactone-and-piezoelectric-poly-3-hydroxybutyrate-co-3-hydroxyvalerate-scaffolds-for-bone-tissue-engineering
#4
Svetlana N Gorodzha, Albert R Muslimov, Dina S Syromotina, Alexander S Timin, Nikolai Y Tcvetkov, Kirill V Lepik, Aleksandra V Petrova, Maria A Surmeneva, Dmitry A Gorin, Gleb B Sukhorukov, Roman A Surmenev
In this study, bone scaffolds composed of polycaprolactone (PCL), piezoelectric poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and a combination of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and silicate containing hydroxyapatite (PHBV-SiHA) were successfully fabricated by a conventional electrospinning process. The morphological, chemical, wetting and biological properties of the scaffolds were examined. All fabricated scaffolds are composed of randomly oriented fibres with diameters from 800nm to 12μm...
September 5, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28754647/biomimetically-grown-apatite-spheres-from-aggregated-bioglass-nanoparticles-with-ultrahigh-porosity-and-surface-area-imply-potential-drug-delivery-and-cell-engineering-applications
#5
Ahmed El-Fiqi, Jennifer O Buitrago, Sung Hee Yang, Hae-Won Kim
Here we communicate the generation of biomimetically grown apatite spheres from aggregated bioglass nanoparticles and the potential properties applicable for drug delivery and cell/tissue engineering. Ion releasing nanoparticulates of bioglass (85%SiO2-15%CaO) in a mineralizing medium show an intriguing dynamic phenomenon - aggregation, mineralization to apatite, integration and growth into micron-sized (1.5-3μm) spheres. During the progressive ionic dissolution/precipitation reactions, nano-to-micro-morphology, glass-to-crystal composition, and the physico-chemical properties (porosity, surface area, and charge) change dynamically...
July 25, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28680554/characterization-and-antimicrobial-efficacy-of-portland-cement-impregnated-with-silver-nanoparticles
#6
Ki Young Nam
PURPOSE: This study investigated the effects of silver nanoparticle (SN) loading into hydraulic calcium silicate-based Portland cement on its mechanical, antibacterial behavior and biocompatibility as a novel dental bone substitute. MATERIALS AND METHODS: Chemically reduced colloidal SN were combined with Portland cement (PC) by the concentrations of 0 (control), 1.0, 3.0, and 5.0 wt%. The physico-mechanical properties of silver-Portland cement nanocomposites (SPNC) were investigated through X-ray diffraction (XRD), setting time, compressive strength, solubility, and silver ion elution...
June 2017: Journal of Advanced Prosthodontics
https://www.readbyqxmd.com/read/28301020/cytotoxicity-and-bioactivity-of-calcium-silicate-cements-combined-with-niobium-oxide-in-different-cell-lines
#7
Leticia Boldrin Mestieri, Ana Lívia Gomes-Cornélio, Elisandra Márcia Rodrigues, Gisele Faria, Juliane Maria Guerreiro-Tanomaru, Mário Tanomaru-Filho
The aim of this study was to evaluate the cytotoxicity and bioactivity of calcium silicate-based cements combined with niobium oxide (Nb2O5) micro and nanoparticles, comparing the response in different cell lines. This evaluation used four cell lines: two primary cultures (human dental pulp cells - hDPCs and human dental follicle cells - hDFCs) and two immortalized cultures (human osteoblast-like cells - Saos-2 and mouse periodontal ligament cells - mPDL). The tested materials were: White Portland Cement (PC), mineral trioxide aggregate (MTA), white Portland cement combined with microparticles (PC/Nb2O5µ) or nanoparticles (PC/Nb2O5n) of niobium oxide (Nb2O5)...
January 2017: Brazilian Dental Journal
https://www.readbyqxmd.com/read/28108409/sol-gel-synthesis-and-characterizations-of-hybrid-chitosan-peg-calcium-silicate-nanocomposite-modified-with-zno-nps-and-e102-for-optical-and-antibacterial-applications
#8
Ahmed M Youssef, Amany M El-Nahrawy, Ali B Abou Hammad
Hybrid Chitosan/Poly ethylene glycol/calcium silicate (CS/PEG/calcium silicate) nanocomposite modified with different two types, zinc oxide nanoparticles (ZnO-NPs) and tartrazine dye (E102) were prepared by sol gel method and the characterization of their structure and biological properties were carried out in order to evaluate the possible use in optical and biomedical fields. The hybrid CS/PEG/calcium silicate complex formations have been established by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopic analysis...
April 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27982226/effect-of-silver-nanoparticles-on-physicochemical-and-antibacterial-properties-of-calcium-silicate-cements
#9
Fernando Vazquez-Garcia, Mário Tanomaru-Filho, Gisselle Moraima Chávez-Andrade, Roberta Bosso-Martelo, Maria Inês Basso-Bernardi, Juliane Maria Guerreiro-Tanomaru
Mineral trioxide aggregate (MTA) and Portland cement (PC) are calcium silicate cements. They have similar physicochemical, mechanical and biological properties. The addition of zirconium oxide (ZrO2) to PC provides radiopacity. Silver nanoparticles (AgNPs) may improve some properties of cements. The aim of this study was to evaluate the effect of AgNPs on physicochemical/mechanical properties and antibacterial activity of white MTA (WMTA) and PC associated with ZrO2. The following materials were evaluated: WMTA; PC 70% + ZrO2 30%; WMTA+ AgNPs; and PC 70% + ZrO2 30% + AgNPs...
September 2016: Brazilian Dental Journal
https://www.readbyqxmd.com/read/27939733/mesoporous-calcium-silicate-nanoparticles-with-drug-delivery-and-odontogenesis-properties
#10
Ching-Yuang Huang, Tsui-Hsien Huang, Chia-Tze Kao, Yuan-Haw Wu, Wan-Chen Chen, Ming-You Shie
INTRODUCTION: Calcium silicate (CS) -based materials play an important role in the development of endodontic materials that induce bone/cementum tissue regeneration and inhibit bacterial viability. The aim of this study was to prepare novel mesoporous CS (MesoCS) nanoparticles that have osteogenic, drug delivery, and antibacterial characteristics for endodontic materials and also have an excellent ability to develop apatite mineralization. METHODS: The MesoCS nanoparticles were prepared using sol-gel methods...
January 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/27918627/exploring-dynamic-surface-processes-during-silicate-mineral-wollastonite-dissolution-with-liquid-cell-tem
#11
D N Leonard, R Hellmann
Most liquid cell transmission electron microscopy (LC TEM) studies focus on nanoparticles or nanowires, in large part because the preparation and study of materials in this size range is straightforward. By contrast, this is not true for samples in the micrometre size range, in large part because of the difficulties associated with sample preparation starting from a 'bulk' material. There are also many advantages inherent to the study of micrometre-sized samples compared to their nanometre-sized counterparts...
December 5, 2016: Journal of Microscopy
https://www.readbyqxmd.com/read/27769275/calcium-silicate-mesoporous-nanoparticles-loaded-with-chlorhexidine-for-both-anti-enterococcus-faecalis-and-mineralization-properties
#12
Wei Fan, Yanyun Li, Qing Sun, Tengjiao Ma, Bing Fan
BACKGROUND: In infected periapical tissues, Enterococcus faecalis is one of the most common dominant bacteria. Chlorhexidine has been proved to show strong antibacterial ability against E. faecalis but is ineffective in promoting mineralization for tissues around root apex. Mesoporous calcium-silicate nanoparticles are newly synthesized biomaterials with excellent ability to promote mineralization and carry-release bioactive molecules in a controlled manner. In this study, mesoporous calcium-silicate nanoparticles were functionalized with chlorhexidine and their releasing profile, antibacterial ability, effect on cell proliferation and in vitro mineralization property were evaluated...
October 21, 2016: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/27704764/synthesis-and-adsorption-properties-of-hierarchically-ordered-nanostructures-derived-from-porous-cao-network
#13
Weijie You, Yali Weng, Xiu Wang, Zanyong Zhuang, Yan Yu
Using the porous framework of CaO as templates and reagents, we explored a surfactant-free and economical method for preparing calcium silicate hydrate (CSH) hierarchically ordered nanostructures. Incorporation of SiO2 nanoparticles into the CaO framework, followed by a reaction assisted by hydrothermal treatment, resulted in the formation of CSH with well-defined morphologies. The structural features of CSH were characterized by 3-D hierarchical networks, wherein nanofibers assembled to form nanosheets, and nanosheets assembled to form hierarchically ordered structures...
December 14, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27612739/nanostructured-silicate-substituted-calcium-phosphate-nanosicaps-nanoparticles-efficient-calcium-phosphate-based-non-viral-gene-delivery-systems
#14
Sudhanshu Shekhar, Abhijit Roy, Daeho Hong, Prashant N Kumta
Nanostructured ceramic particles, particularly, nanoparticles of calcium phosphate (CaP) remain an attractive option among the various types of non-viral gene delivery vectors studied because of their safety, biocompatibility, biodegradability, and ease of handling as well as their adsorptive capacity for DNA. We have accordingly developed an enhanced version of nanostructured calcium phosphates (NanoCaPs), by substituting known amounts of silicate for phosphate in the hydroxyapatite (HA) lattice (NanoSiCaPs)...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/27543348/influences-of-ag-nps-doping-chitosan-calcium-silicate-nanocomposites-for-optical-and-antibacterial-activity
#15
Amany M El-Nahrawy, Ahmed I Ali, Ali B Abou Hammad, Ahmed M Youssef
Chitosan (CS)/calcium silicate nanocomposites pure and doped with Ag ions (1, 2mol%) were prepared via sol-gel method. The prepared CS/calcium silicate nanocomposites were investigated through X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). The XRD results, indicating that after increasing the Ag ions in the CS/calcium silicate nanocomposite the crystallinity degree increased regularly in the prepared nanocomposites accompanying to the continuously rearrangement in the internal structure of nanocomposite under the effect of inorganic nanoparticles...
December 2016: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/27383700/effect-of-addition-of-nano-hydroxyapatite-on-physico-chemical-and-antibiofilm-properties-of-calcium-silicate-cements
#16
Juliane Maria Guerreiro-Tanomaru, Fernando Antonio Vázquez-García, Roberta Bosso-Martelo, Maria Inês Basso Bernardi, Gisele Faria, Mario Tanomaru
OBJECTIVE: Mineral Trioxide Aggregate (MTA) is a calcium silicate cement composed of Portland cement (PC) and bismuth oxide. Hydroxyapatite has been incorporated to enhance mechanical and biological properties of dental materials. This study evaluated physicochemical and mechanical properties and antibiofilm activity of MTA and PC associated with zirconium oxide (ZrO2) and hydroxyapatite nanoparticles (HAn). MATERIAL AND METHODS: White MTA (Angelus, Brazil); PC (70%)+ZrO2 (30%); PC (60%)+ZrO2 (30%)+HAn (10%); PC (50%)+ZrO2 (30%)+HAn (20%) were evaluated...
May 2016: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/27383373/self-sealing-porous-silicon-calcium-silicate-core-shell-nanoparticles-for-targeted-sirna-delivery-to-the-injured-brain
#17
Jinyoung Kang, Jinmyoung Joo, Ester J Kwon, Matthew Skalak, Sazid Hussain, Zhi-Gang She, Erkki Ruoslahti, Sangeeta N Bhatia, Michael J Sailor
Calcium ions react with silicic acid released from dissolving porous silicon nanoparticles to create an insoluble calcium silicate shell. The calcium silicate shell traps and protects an siRNA payload, which can be delivered to neuronal tissues in vitro or in vivo. Gene delivery is enhanced by the action of targeting and cell-penetrating peptides attached to the calcium silicate shell.
September 2016: Advanced Materials
https://www.readbyqxmd.com/read/26866999/interaction-grand-potential-between-calcium-silicate-hydrate-nanoparticles-at-the-molecular-level
#18
Patrick A Bonnaud, Christophe Labbez, Ryuji Miura, Ai Suzuki, Naoto Miyamoto, Nozomu Hatakeyama, Akira Miyamoto, Krystyn J Van Vliet
Calcium-silicate-hydrate (or C-S-H), an inosilicate, is the major binding phase in cement pastes and concretes and a porous hydrated material made up of a percolated and dense network of crystalline nanoparticles of a mean apparent spherical diameter of ∼5 nm that are each stacks of multiple C-S-H layers. Interaction forces between these nanoparticles are at the origin of C-S-H chemical, physical, and mechanical properties at the meso- and macroscales. These particle interactions and the resulting properties may be affected significantly by nanoparticle density and environmental conditions such as the temperature, relative humidity, or concentration of chemical species in the bulk solution...
February 21, 2016: Nanoscale
https://www.readbyqxmd.com/read/26858450/mesoscale-texture-of-cement-hydrates
#19
Katerina Ioannidou, Konrad J Krakowiak, Mathieu Bauchy, Christian G Hoover, Enrico Masoero, Sidney Yip, Franz-Josef Ulm, Pierre Levitz, Roland J-M Pellenq, Emanuela Del Gado
Strength and other mechanical properties of cement and concrete rely upon the formation of calcium-silicate-hydrates (C-S-H) during cement hydration. Controlling structure and properties of the C-S-H phase is a challenge, due to the complexity of this hydration product and of the mechanisms that drive its precipitation from the ionic solution upon dissolution of cement grains in water. Departing from traditional models mostly focused on length scales above the micrometer, recent research addressed the molecular structure of C-S-H...
February 23, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/26811852/encapsulation-of-fret-based-glucose-and-maltose-biosensors-to-develop-functionalized-silica-nanoparticles
#20
G Faccio, M B Bannwarth, C Schulenburg, V Steffen, D Jankowska, M Pohl, R M Rossi, K Maniura-Weber, L F Boesel, M Richter
Silicate nanoparticles with immobilized FRET-based biosensors were developed for the detection of glucose and maltose. Immobilization of the protein biosensor in the nanoparticle was achieved through specific interaction between the hexa-histidine tag of the protein and a calcium-silicate complex of the silica matrix. Encapsulation of the biosensors preserved the affinity for the respective sugar. Compared to the free biosensors, encapsulation had a stabilizing effect on the biosensor towards chemical and thermal denaturation...
June 20, 2016: Analyst
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