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Silicate substituted

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https://www.readbyqxmd.com/read/28346797/substituted-borosilicate-glasses-with-improved-osteogenic-capacity-for-bone-tissue-engineering
#1
João S Fernandes, Piergiorgio Gentile, Aileen Crawford, Ricardo A Pires, Paul V Hatton, Rui L Reis
Borosilicate bioactive glasses (BBGs) have shown the capacity to promote higher formation of new bone when compared with silicate bioactive glasses. Herein, we assessed the capacity of BBGs to induce osteogenic differentiation of bone marrow mesenchymal stem cells (BM-MSCs) as a function of their substituted divalent cations (Mg(2+), Ca(2+), Sr(2+)). To this purpose, we synthesized BBG particles by melt quenching. The cell viability, proliferation, and morphology (i.e., PrestoBlue(®), PicoGreen(®), and DAPI and Phalloidin stainings, respectively), as well as protein expression (i...
March 27, 2017: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/28322056/preparation-of-ultrathin-robust-nanohybrid-capsules-through-a-beyond-biomineralization-method
#2
Shaohua Zhang, Zhongyi Jiang, Weilun Qian, Jiafu Shi, Xiaoli Wang, Lei Tang, Hongjian Zou, Hua Liu
Herein, a facile and generic method is developed to prepare ultrathin, robust nanohybrid capsules by manipulating the dynamic structure of supramolecular nanocoatings on CaCO3 sacrificial templates through incorporating multivalent-anion substitution process into biomineralization. Above biomineralization level, multivalent anions, e.g., phosphate, sulfate or citrate, are employed to initiate the assembly of polyamine into continuous (non-segregated) polyamine-anion supramolecular nanocoatings on CaCO3 sacrificial templates...
March 21, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28281635/aluminum-induced-dreierketten-chain-cross-links-increase-the-mechanical-properties-of-nanocrystalline-calcium-aluminosilicate-hydrate
#3
Guoqing Geng, Rupert J Myers, Jiaqi Li, Roya Maboudian, Carlo Carraro, David A Shapiro, Paulo J M Monteiro
The incorporation of Al and increased curing temperature promotes the crystallization and cross-linking of calcium (alumino)silicate hydrate (C-(A-)S-H), which is the primary binding phase in most contemporary concrete materials. However, the influence of Al-induced structural changes on the mechanical properties at atomistic scale is not well understood. Herein, synchrotron radiation-based high-pressure X-ray diffraction is used to quantify the influence of dreierketten chain cross-linking on the anisotropic mechanical behavior of C-(A-)S-H...
March 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28281315/silicates-in-orthopaedics-and-bone-tissue-engineering-materials
#4
REVIEW
Xianfeng Zhou, Nianli Zhang, Steven Mankoci, Nita Sahai
Following the success of silicate-based glasses as bioactive materials, silicates are believed to play important roles in promoting bone formation and have therefore been considered to provide a hydroxyapatite surface layer capable of binding to bone as well as potentially being a pro-osteoinductive factor. Natural silicate minerals and silicate-substituted hydroxyapatites are also being actively investigated as orthopaedic bone and dental biomaterials for application in tissue engineering. However, the mechanisms for the proposed roles of silicate in these materials have not been fully understood and are controversial...
March 9, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28278046/multilayered-polyion-complexes-with-dissolvable-silica-layer-covered-by-controlling-densities-of-crgd-conjugated-peg-chains-for-cancer-targeted-sirna-delivery
#5
Mitsuru Naito, Ryota Azuma, Hiroyasu Takemoto, Mao Hori, Naoto Yoshinaga, Shigehito Osawa, Rimpei Kamegawa, Hyun Jin Kim, Takehiko Ishii, Nobuhiro Nishiyama, Kanjiro Miyata, Kazunori Kataoka
Surface functionalization of nanoparticles is a crucial factor for nanoparticle-mediated drug and nucleic acid delivery. Particularly, the density of targeting ligands on nanoparticle significantly affects the affinity of nanoparticles to specific cellular surface (or receptor) through the multivalent binding effect. Herein, multilayered polyion complexes (mPICs) are prepared to possess varying densities of cyclic RGD peptide (cRGD) ligands for cancer-targeted small interfering RNA (siRNA) delivery. A template PIC is first prepared by mixing siRNAs with homo catiomers of N-substituted polyaspartamide bearing tetraethylenepentamine (PAsp(TEP)) in aqueous solution, followed by silica-coating through silicate condensation reaction...
March 12, 2017: Journal of Biomaterials Science. Polymer Edition
https://www.readbyqxmd.com/read/28257006/solid-state-nmr-and-short-range-order-in-crystalline-oxides-and-silicates-a-new-tool-in-paramagnetic-resonances
#6
Jonathan F Stebbins, Ryan J McCarty, Aaron C Palke
Most applications of high-resolution NMR to questions of short-range order/disorder in inorganic materials have been made in systems where ions with unpaired electron spins are of negligible concentration, with structural information extracted primarily from chemical shifts, quadrupolar coupling parameters, and nuclear dipolar couplings. In some cases, however, the often-large additional resonance shifts caused by interactions between unpaired electron and nuclear spins can provide unique new structural information in materials with contents of paramagnetic cations ranging from hundreds of ppm to several per cent and even higher...
March 1, 2017: Acta Crystallographica. Section C, Structural Chemistry
https://www.readbyqxmd.com/read/28091955/genome-wide-exploration-of-silicon-si-transporter-genes-lsi1-and-lsi2-in-plants-insights-into-si-accumulation-status-capacity-of-plants
#7
Recep Vatansever, Ibrahim Ilker Ozyigit, Ertugrul Filiz, Nermin Gozukara
Silicon (Si) is a nonessential, beneficial micronutrient for plants. It increases the plant stress tolerance in relation to its accumulation capacity. In this work, root Si transporter genes were characterized in 17 different plants and inferred for their Si-accumulation status. A total of 62 Si transporter genes (31 Lsi1 and 31 Lsi2) were identified in studied plants. Lsi1s were 261-324 residues protein with a MIP family domain whereas Lsi2s were 472-547 residues with a citrate transporter family domain. Lsi1s possessed characteristic sequence features that can be employed as benchmark in prediction of Si-accumulation status/capacity of the plants...
January 13, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28088144/more-room-for-microphase-separation-an-extended-study-on-binary-liquids-confined-in-sba-15-cylindrical-pores
#8
Ramona Mhanna, Abdel Razzak Abdel Hamid, Sujeet Dutta, Ronan Lefort, Laurence Noirez, Bernhard Frick, Denis Morineau
The confinement of liquid mixtures in porous channels provides new insight into fluid ordering at the nanoscale. In this study, we address a phenomenon of microphase separation, which appears as a novel fascinating confinement effect for fully miscible binary liquids. We investigate the structure of tert-butanol-toluene mixtures confined in the straight and mono-dispersed cylindrical nanochannels of SBA-15 mesoporous silicates (D = 8.3 nm). Small angle neutron scattering experiments on samples with carefully designed isotopic compositions are performed to systematically vary the scattering length density of the different compounds and assess the radial concentration profile of the confined phases...
January 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28043751/bone-incorporation-of-silicate-substituted-calcium-phosphate-in-2-stage-revision-anterior-cruciate-ligament-reconstruction-a-histologic-and-radiographic-study
#9
Jan von Recum, Johannes Schwaab, Thorsten Guehring, Paul-Alfred Grützner, Marc Schnetzke
PURPOSE: To evaluate the histologic and radiographic outcomes of using silicate-substituted calcium phosphate (Si-CaP) as bone graft substitute for the augmentation of tunnel defects in 2-stage revision anterior cruciate ligament (ACL) reconstruction. METHODS: Forty patients undergoing 2-stage revision ACL reconstruction were included in a prospective, randomized controlled clinical trial between 2012 and 2015. The inclusion criteria were tunnel diameter of the tibial and/or femoral tunnel of 10 mm or greater after failed ACL reconstruction...
December 30, 2016: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/27994411/comparative-evaluation-of-calcium-silicate-based-dentin-substitute-biodentine-%C3%A2-and-calcium-hydroxide-pulpdent-in-the-formation-of-reactive-dentin-bridge-in-regenerative-pulpotomy-of-vital-primary-teeth-triple-blind-randomized-clinical-trial
#10
Navneet Grewal, Rubica Salhan, Nirapjeet Kaur, Hemal Bipin Patel
BACKGROUND: Considering the biological concerns of calcium hydroxide (CH) as a pulpotomy agent, an alternative silicate based dentin substitute i.e. Biodentine (Ca3SiO5) was evaluated clinically and radiographically. AIMS: To evaluate the effectiveness of dentin substitute (Biodentine) in regenerative pulpotomy of vital primary teeth that would giv a biological base to its use in forming reactive dentin bridge and overcoming the drawbacks of calcium hydroxide. MATERIAL AND METHODS: Randomised clinical trial on 40 bilateral carious primary molars in 20 participant children (aged 5-10 years) was carried out by same operator using Ca3SiO5(group-1) and CH (group-2) as vital pulpotomy agents...
October 2016: Contemporary Clinical Dentistry
https://www.readbyqxmd.com/read/27973859/nanoscale-charge-balancing-mechanism-in-alkali-substituted-calcium-silicate-hydrate-gels
#11
V Ongun Özçelik, Claire E White
Alkali-activated materials and related alternative cementitious systems are sustainable technologies that have the potential to substantially lower the CO2 emissions associated with the construction industry. However, these systems have augmented chemical compositions as compared to ordinary Portland cement (OPC), which may impact the evolution of the hydrate phases. In particular, calcium-silicate-hydrate (C-S-H) gel, the main hydrate phase in OPC, is likely to be altered at the atomic scale due to changes in the bulk chemical composition, specifically via the addition of alkalis (i...
December 15, 2016: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/27966277/the-luminescent-properties-and-crystal-structure-of-sr-1-5-x-1-5y-mg0-5-sio4-xeu-2-yce-3-blue-phosphor-synthesized-by-co-precipitation-method
#12
Jin Shan Wang, Da-Chuan Zhu, Cong Zhao, Tao Han, ShaSha Liu
In order to improve the luminescent performance of silicate blue phosphors, Sr(1.5-x)-(1.5y) Mg0.5 SiO4 :xEu(2)(+) ,yCe(3+) phosphors were synthesized using one-step calcination of a precursor prepared by chemical co-precipitation. The crystal structure and luminescent properties of the phosphors were analyzed using X-ray diffraction and fluorescence spectrophotometry, respectively. Because the activated ions (Eu(2+) ) can occupy two different types of sites (Sr1 and Sr2 ), the emission spectrum of Eu(2)(+) excited at 350 nm contains two single bands (EM1 and EM2 ) in the wavelength range 400-550 nm, centered at 463 nm, and the emission intensity first increases and then decreases with increasing concentrations of Eu(2)(+) ions...
December 14, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/27897396/acid-mediated-synthesis-of-ordered-mesoporous-aluminosilicates-the-challenge-and-the-promise
#13
Nunna V Krishna, Parasuraman Selvam
A new intrinsic hydrolysis method was employed, for the first-time, to synthesize well-ordered H-AlSBA-15 with trivalent aluminium exclusively in the tetrahedral framework structure of SBA-15. Unlike other methods, which involve incorporation of aluminium ions in both the framework (Brønsted) and non-framework (Lewis) sites of the silicate matrix, the intrinsic hydrolysis method isomorphously substitutes aluminium ions in the tetrahedral network even at high aluminium content. This unique approach relies mainly on the hydrolysis rates of the inorganic (silicon and aluminium) precursors used for the preparation in such a way that the condensation occurs simultaneously so as to overcome the usually encountered difficulties in stabilizing aluminium ions in the silicate matrix...
January 31, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27886316/the-mechanism-of-large-second-harmonic-generation-enhancement-activated-by-zn-2-substitution
#14
Miriding Mutailipu, Zhi Li, Min Zhang, Dianwei Hou, Zhihua Yang, Bingbing Zhang, Hongping Wu, Shilie Pan
Substitution is an effective method to create new nonlinear optical (NLO) materials with an enhanced second harmonic generation (SHG) response. However, the large SHG enhancement caused by the substitution of Mg(2+) for Zn(2+) in an isostructural system is rare and has not been investigated yet. Here we elucidate the contribution of Zn(2+) with d(10) electronic configuration to the SHG response based on two isostructural silicates Sr2MSi2O7 (M = Zn and Mg). The powder SHG measurements show that the SHG response of Sr2ZnSi2O7 is approximately 35 times that of α-SiO2 and 7 times higher than its isostructural compound Sr2MgSi2O7...
December 7, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27809347/atomic-resolution-imaging-of-beryl-an-investigation-of-the-nano-channel-occupation
#15
V Arivazhagan, F D Schmitz, P E Vullum, A T J VAN Helvoort, B Holst
Beryl in different varieties (emerald, aquamarine, heliodor etc.) displays a wide range of colours that have fascinated humans throughout history. Beryl is a hexagonal cyclo-silicate (ring-silicate) with channels going through the crystal along the c-axis. The channels are about 0.5 nm in diameter and can be occupied by water and alkali ions. Pure beryl (Be3 Al2 Si6 O18 ) is colourless (variety goshenite). The characteristic colours are believed to be mainly generated through substitutions with metal atoms in the lattice...
November 3, 2016: Journal of Microscopy
https://www.readbyqxmd.com/read/27745960/lead-recovery-and-high-silica-glass-powder-synthesis-from-waste-crt-funnel-glasses-through-carbon-thermal-reduction-enhanced-glass-phase-separation-process
#16
Mingfei Xing, Zegang Fu, Yaping Wang, Jingyu Wang, Zhiyuan Zhang
In this study, a novel process for the removal of toxic lead from the CRT funnel glass and synchronous preparation of high silica glass powder was developed by a carbon-thermal reduction enhanced glass phase separation process. CRT funnel glass was remelted with B2O3 in reducing atmosphere. In the thermal process, a part of PbO contained in the funnel glass was reduced into metallic Pb and detached from the glass phase. The rest of PbO and other metal oxides (including Na2O, K2O, Al2O3, BaO and CaO) were mainly concentrated in the boric oxide phase...
October 6, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27711438/preparation-and-structure-of-fe-containing-aluminosilicate-thin-films
#17
Héloïse Tissot, Linfei Li, Shamil Shaikhutdinov, Hans-Joachim Freund
In attempts to fabricate model systems of Fe-containing aluminosilicates, we studied the incorporation of iron into silicate and aluminosilicate bilayer films grown on Ru(0001). Structural characterization was performed by low energy electron diffraction, X-ray photoelectron spectroscopy, infrared reflection-absorption spectroscopy and scanning tunneling microscopy. The experimental results show that even at low concentrations Fe does not randomly substitute Si(Al) cations in the silicate framework, but segregates into a pure silicate (aluminosilicate) phase and an Fe-silicate phase which is formed by an FeO(111)-like layer underneath a silicate layer...
September 14, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27623299/radiographic-and-clinical-outcome-of-silicate-substituted-calcium-phosphate-si-cap-ceramic-bone-graft-in-spinal-fusion-procedures
#18
Marjan Alimi, Rodrigo Navarro-Ramirez, Karishma Parikh, Innocent Njoku, Christoph P Hofstetter, Apostolos J Tsiouris, Roger Härtl
STUDY DESIGN: Retrospective cohort study. OBJECTIVE: To evaluate the radiographic and clinical outcome of silicate-substituted calcium phosphate (Si-CaP), utilized as a graft substance in spinal fusion procedures. SUMMARY OF BACKGROUND DATA: Specific properties of Si-CaP provide the graft with negative surface charge that can result in a positive effect on the osteoblast activity and neovascularization of the bone. METHODS: This study included those patients who underwent spinal fusion procedures between 2007 and 2011 in which Si-CaP was used as the only bone graft substance...
September 10, 2016: Clinical Spine Surgery
https://www.readbyqxmd.com/read/27613416/solidification-and-immobilization-of-mswi-fly-ash-through-aluminate-geopolymerization-based-on-partial-charge-model-analysis
#19
Lei Zheng, Wei Wang, Xingbao Gao
This study presents an integrated synopsis of the solidification and immobilization mechanisms of fly ash-based geopolymers. A rational analysis of the ion reactions involved in geopolymerization was conducted using the partial charge model (PCM). The following conclusions were obtained: (1) heavy metal cations cannot be immobilized as counter cations through exchange with Na(+); (2) isomorphous substitution of heavy metals in the geopolymer can be expected from the condensation reaction between the hydrolyzed heavy metal species and aluminosilicate; (3) the hydrolyzed species condensation could result in solidification and immobilization and be promoted by aluminates; and (4) a geopolymer with the highest immobilization and solidification efficiency can be obtained at an intermediate pH value...
December 2016: Waste Management
https://www.readbyqxmd.com/read/27612803/effect-of-ti-4-on-in-vitro-bioactivity-and-antibacterial-activity-of-silicate-glass-ceramics
#20
Madeeha Riaz, Rehana Zia, Farhat Saleemi, Tousif Hussain, Farooq Bashir, Hafeez Ikhram
A novel glass-ceramic series in (48-x) SiO2-36 CaO-4 P2O5-12 Na2O-xTiO2 (where x=0, 3.5, 7, 10.5 and 14mol %) system was synthesized by crystallization of glass powders, obtained by melt quenching technique. The differential scanning calorimetric analysis (DSC) was used to study the non-isothermal crystallization kinetics of the as prepared glasses. The crystallization behaviour of glasses was analyzed under non-isothermal conditions, and qualitative phase analysis of glass-ceramics was made by X-ray diffraction...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
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