pH control of the structure, composition, and catalytic activity of sulfated zirconia

Иванов, В. К.; Baranchikov, А. Е.; Kopitsa, G. P.; Лермонтов, С. А.; Yurkova, L. L.; Gubanova, N. N.; Иванова, О. С.; Lermontov, A. S.; Rumyantseva, M. N.; Vasilyeva, Larisa P.; Sharp, Melissa; Pranzas, P. Klaus; Tretyakov, Yuri D.

doi:10.1016/j.jssc.2012.11.022

Cited by 25 publications

(20 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The existence of a broad peak in the range 2θ = 25-45°is likely to be related to strong intra-layer distortions: similar X-ray diffraction patterns are characteristic of strongly amorphized solids with a highly distorted short-range ordering, e.g. hydrated zirconium dioxide [35,36]. Note that, as evidenced by X-ray diffraction (XRD), dialysis purification of the gels only weakly changed their structure.…”

Section: Resultsmentioning

confidence: 95%

Cerous phosphate gels: Synthesis, thermal decomposition and hydrothermal crystallization paths

Шекунова

Baranchikov

Иванова

et al. 2016

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

Section: Resultsmentioning

confidence: 95%

Cerous phosphate gels: Synthesis, thermal decomposition and hydrothermal crystallization paths

Шекунова

Baranchikov

Иванова

et al. 2016

Journal of Non-Crystalline Solids

View full text Add to dashboard Cite

“…composition, temperature, acidity of starting solution, etc.) [39][40][41]. For example, variation of precipitation pH changes the relative rates of the hydrolysis and condensation of zirconium-based clusters.…”

Section: Introductionmentioning

confidence: 99%

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Gubanova

Baranchikov

Kopitsa

et al. 2015

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

In the present work, we have studied for the first time the combined effect of both sonication and precipitation pH on the structure of amorphous zirconia gels synthesized from zirconium(IV) propoxide. The techniques of small-angle neutron and X-ray scattering (SANS and SAXS) and low temperature nitrogen adsorption provided the integral data on the changes in the microstructure and mesostructure of these materials caused by ultrasonic treatment.Amorphous ZrO 2 ·xH 2 O synthesized under ultrasonic treatment was found to possess a very structured surface, characterized by the surface fractal dimension 2.9-3.0, compared to 2.3-2.5 for the non US-assisted synthesis, and it was also found to possess a higher specific surface area, while the sizes of the primary particles remain unchanged.

show abstract

“…2d , Supplementary Movie 2 ). We calculated the adhesion strength for the apoHRP(1.0) gel/FePor(1.0) gel assembly, using the adhesion area (25 mm 2 ) and lifting of the gel weight (22 mg × 3), to be at least 28 Pa. In contrast, the same gel type (e.g., a combination of the apoHRP(1.0) gel/apoHRP(1.0) gel) and the combination of blank gel/apoHRP(1.0) gel and blank gel/FePor(1.0) gel did not adhere to each other.…”

Section: Resultsmentioning

confidence: 99%

“…The oxidative rate was correlated with the adhesive surface area of the apoHRP(1.0) gel/FePor(1.0) gel assembly. The oxidative rate of ABTS in the presence of the apoHRP(1.0) gel/FePor(1.0) gel assembly increased when the adhesive area of the gel assembly increased from 6.2 to 25 mm 2 ( Fig. S15 ).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Manual control of catalytic reactions: Reactions by an apoenzyme gel and a cofactor gel

Kobayashi

Takashima

Hashidzume

et al. 2015

Sci Rep

View full text Add to dashboard Cite

Enzymes play a vital role in catalysing almost all chemical reactions that occur in biological systems. Some enzymes must form complexes with non-protein molecules called cofactors to express catalytic activities. Although the control of catalytic reactions via apoenzyme–cofactor complexes has attracted significant attention, the reports have been limited to the microscale. Here, we report a system to express catalytic activity by adhesion of an apoenzyme gel and a cofactor gel. The apoenzyme and cofactor gels act as catalysts when they form a gel assembly, but they lose catalytic ability upon manual dissociation. We successfully construct a system with switchable catalytic activity via adhesion and separation of the apoenzyme gel with the cofactor gel. We expect that this methodology can be applied to regulate the functional activities of enzymes that bear cofactors in their active sites, such as the oxygen transport of haemoglobin or myoglobin and the electron transport of cytochromes.

show abstract

pH control of the structure, composition, and catalytic activity of sulfated zirconia

Cited by 25 publications

References 40 publications

Cerous phosphate gels: Synthesis, thermal decomposition and hydrothermal crystallization paths

Cerous phosphate gels: Synthesis, thermal decomposition and hydrothermal crystallization paths

Combined SANS and SAXS study of the action of ultrasound on the structure of amorphous zirconia gels

Manual control of catalytic reactions: Reactions by an apoenzyme gel and a cofactor gel

Contact Info

Product

Resources

About