Comparative analysis of adsorption and light decomposition of methylene blue by ordered mesoporous C-Nb-TiO2 nanocomposites prepared via self-assembly and sol-gel methods

2017 ◽  
Vol 90 ◽  
pp. 299-310 ◽  
Author(s):  
Ying Ding ◽  
Jianzhong Zhu ◽  
Di Zhang ◽  
Shengtao Jiang ◽  
Khan Osama Sarwar ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Comparative Analysis ◽  
Self Assembly ◽  
Sol Gel ◽  
Ordered Mesoporous

scholarly journals Effect of boron incorporation on the bioactivity, structure, and mechanical properties of ordered mesoporous bioactive glasses

2020 ◽  
Vol 8 (7) ◽  
pp. 1456-1465 ◽  
Author(s):  
Leonie Deilmann ◽  
Oliver Winter ◽  
Bianca Cerrutti ◽  
Henrik Bradtmüller ◽  
Christopher Herzig ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Self Assembly ◽  
Sol Gel ◽  
Bioactive Glasses ◽  
Structure Directing Agent ◽  
Structural Investigations ◽  
Ordered Mesoporous ◽  
Evaporation Induced Self Assembly

B2O3 doped (0.5–15 mol%) ordered mesoporous bioactive glasses were synthesized via sol–gel based evaporation-induced self-assembly using P123 as a structure directing agent and characterized by biokinetic, mechanical and structural investigations.

Photocatalytic Activity of Pd Doped Tin Dioxide Inverse Opal Films

2012 ◽  
Vol 534 ◽  
pp. 135-140 ◽  
Author(s):  
Yang Liu ◽  
Bo Li ◽  
You Wei Yao ◽  
Jing Jing Gao ◽  
Zhen Dong Liu ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Self Assembly ◽  
Tin Dioxide ◽  
Uv Light ◽  
Sol Gel ◽  
The Self ◽  
Inverse Opal ◽  
Polystyrene Microsphere ◽  
Assembly Technique

Inverse opal films (IOFs) of SnO2 doped with Pd were prepared by the self-assembly technique using polystyrene microsphere (PS sphere) as template in combination with a sol-gel method. The photocatalysis properties of SnO2 IOFs were estimated through measuring the rate of the degradation of methylene blue (MB). The result shows that SnO2 IOFs have good photocatalytic activity, the solution of MB was degradated over 60% in 4 hours when it was dipped in SnO2 IOFs and exposed in the UV light. The addition of Pd in SnO2 IOFs improved the photocatalytic activity of the films and the degradation of MB can exceed 80% with the same condition. This sort of SnO2 IOFs doped with Pd indicated a potential application in photocatalysis field.

scholarly journals Block copolymer self-assembly–directed synthesis of mesoporous gyroidal superconductors

2016 ◽  
Vol 2 (1) ◽  
pp. e1501119 ◽  
Author(s):  
Spencer W. Robbins ◽  
Peter A. Beaucage ◽  
Hiroaki Sai ◽  
Kwan Wee Tan ◽  
Jörg G. Werner ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Self Assembly ◽  
Thermal Processing ◽  
Niobium Oxide ◽  
Sol Gel ◽  
Niobium Nitride ◽  
Ammonia Gas ◽  
Ordered Mesoporous ◽  
Directed Synthesis ◽  
Synthetic Approaches

Superconductors with periodically ordered mesoporous structures are expected to have properties very different from those of their bulk counterparts. Systematic studies of such phenomena to date are sparse, however, because of a lack of versatile synthetic approaches to such materials. We demonstrate the formation of three-dimensionally continuous gyroidal mesoporous niobium nitride (NbN) superconductors from chiral ABC triblock terpolymer self-assembly–directed sol-gel–derived niobium oxide with subsequent thermal processing in air and ammonia gas. Superconducting materials exhibit a critical temperature (Tc) of about 7 to 8 K, a flux exclusion of about 5% compared to a dense NbN solid, and an estimated critical current density (Jc) of 440 A cm−2at 100 Oe and 2.5 K. We expect block copolymer self-assembly–directed mesoporous superconductors to provide interesting subjects for mesostructure-superconductivity correlation studies.

scholarly journals Mesoporous MgTa2O6 thin films with enhanced photocatalytic activity: On the interplay between crystallinity and mesostructure

2012 ◽  
Vol 3 ◽  
pp. 123-133 ◽  
Author(s):  
Jin-Ming Wu ◽  
Igor Djerdj ◽  
Till von Graberg ◽  
Bernd M Smarsly
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Calcination Temperature ◽  
Self Assembly ◽  
Sol Gel ◽  
Mesoporous Structure ◽  
Ordered Mesoporous ◽  
Mesoporous Film ◽  
Evaporation Induced Self Assembly ◽  
Poly Ethylene

Ordered mesoporous, crystalline MgTa2O6 thin films with a mesoscopic nanoarchitecture were synthesized by evaporation-induced self-assembly (EISA) in combination with a sol–gel procedure. Utilization of novel templates, namely the block copolymers KLE (poly(ethylene-co-butylene)-b-poly(ethylene oxide)) and PIB6000 (CH3C(CH3)2(CH2C(CH3)2)107CH2C(CH3)2C6H4O(CH2CH2O)100H), was the key to achieving a stable ordered mesoporous structure even upon crystallization of MgTa2O6 within the mesopore walls. The effect of the calcination temperature on the ability of the mesoporous films to assist the photodegradation of rhodamine B in water was studied. As a result, two maxima in the photocatalytic activity were identified in the calcination temperature range of 550–850 °C, peaking at 700 °C and 790 °C, and the origin of this was investigated by using temperature-dependent X-ray scattering. Optimal activity was obtained when the mesoporous film was heated to 790 °C; at this temperature, crystallinity was significantly high, with MgTa2O6 nanocrystals of 1.6 nm in size (averaged over all reflections), and an ordered mesoporous structure was maintained. When considering the turnover frequency of such photocatalysts, the optimized activity of the present nanoarchitectured MgTa2O6 thin film was ca. four times that of analogous anatase TiO2 films with ordered mesopores. Our study demonstrated that high crystallinity and well-developed mesoporosity have to be achieved in order to optimize the physicochemical performance of mesoporous metal-oxide films.

Sol–gel synthesis of 2-dimensional TiO2: self-assembly of Ti–oxoalkoxy–acetate complexes by carboxylate ligand directed condensation

2021 ◽  
Author(s):  
Ruohong Sui ◽  
Connor E. Deering ◽  
Rohen Prinsloo ◽  
Christopher B. Lavery ◽  
Nancy Chou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Sol Gel ◽  
Carboxylate Ligand ◽  
Sol Gel Synthesis ◽  
First Time

2-Dimensional TiO2 is synthesized for the first time by a sol–gel self-assembly of Ti–oxoalkoxy–acetate complexes.

Photocatalytic Degradation of Methylene Blue by NiO Thin Films under Solar Light Irradiation

2019 ◽  
Vol 56 ◽  
pp. 152-157 ◽  
Author(s):  
Abdelouahab Noua ◽  
Hichem Farh ◽  
Rebai Guemini ◽  
Oussama Zaoui ◽  
Tarek Diab Ounis ◽  
...  
Keyword(s):  
Thin Films ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Visible Region ◽  
Optical Transmittance ◽  
Dip Coating ◽  
Light Irradiation ◽  
Solar Light ◽  
Solar Light Irradiation

Nickel oxide (NiO) thin films were successfully deposited by sol-gel dip-coating method on glass substrates. The structural, morphological and optical properties in addition to the photocatalytic activity of the prepared films were investigated. The results show that the films have a polycrystalline NiO cubic structure with dense NiO grains and average optical transmittance in the visible region. The photocatalytic properties of the films were studied through the degradation of methylene blue and 89% of degradation was achieved for 4.5h of solar light irradiation exposure which indicates the capability of NiO photocatalytic activity.

Characterization of ordered mesoporous films on silicon (001) surface using X-ray and electron diffraction

2005 ◽  
Vol 38 (1) ◽  
pp. 211-216 ◽  
Author(s):  
Pang-Hung Liu ◽  
Kuei-Jung Chao ◽  
Xing-Jian Guo ◽  
Kuo-Ying Huang ◽  
Yen-Ru Lee ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Sol Gel ◽  
Dip Coating ◽  
Silica Film ◽  
Continuous Film ◽  
X Ray ◽  
Transmission Electron ◽  
Ordered Mesoporous ◽  
Direction Dependence

A continuous silica film with well aligned mesochannels parallel to the Si(001) surface was found to be formed through sol–gel dip-coating of a silica precursor with nonionic ethylene oxide surfactant. Two two-dimensional mesoporous structures in centered and non-centered rectangular symmetries and with the short axes of elongated ellipsoidal pores normal to the surface were observed by X-ray and electron diffraction. Detailed transmission electron microscopy investigations were employed to view the direction dependence of the channel or pore packing in the continuous film.

KNN-BF Lead-Free Piezoelectric Ceramics Synthesized by Sol-Gel Method

2015 ◽  
Vol 740 ◽  
pp. 3-6
Author(s):  
Guo Yuan Cheng ◽  
Xing Hua Fu ◽  
Xin Jin ◽  
Wen Hong Tao ◽  
Yu Qin Qiang
Keyword(s):  
Comparative Analysis ◽  
Citric Acid ◽  
Dielectric Loss ◽  
Sintering Temperature ◽  
Sol Gel ◽  
Piezoelectric Ceramics ◽  
Lead Free ◽  
Gel Method ◽  
Sol Gel Method ◽  
Metal Chelator

KNN-BF piezoelectric ceramics synthesized by sol-gel method in this experiment. By controlling bismuth and iron content in the system to study effects of them. We selected citric acid as metal chelator and ethylene glycol as esterification agent. PH maintained 5-6 during preparation of the sol. Sintering temperature of ceramic selected 1100°C. Preparation ceramics under these conditions and comparative analysis, the structure of ceramics is single perovskite and shap of crystals are square block. With the increase of x, properties of ceramics firstly increases and then decreases: d33, εr, Qm, Kpreaching the maximum, values of them were 136pC/N, 630(f =1KHz), 212, 0.41 respectively; dielectric loss to minimum is 0.07(f =1KHz); at this point, ceramics had best performance.

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