Acid–base sensor based on sol–gel encapsulation of bromothymol blue in silica: application for milk spoilage detection

2021 ◽  
Author(s):  
Mariele K. Stocker ◽  
Murilo L. Sanson ◽  
Arthur A. Bernardes ◽  
Antonio Marchi Netto ◽  
Rodrigo Brambilla
Keyword(s):  
Sol Gel ◽  
Bromothymol Blue ◽  
Acid Base

Direct Synthesis of 3,5-Dinitropyrazole Catalyzed by Newly Sulfated Nanosolid Superacid TiO2/ SO

2011 ◽  
Vol 391-392 ◽  
pp. 1296-1301
Author(s):  
Li Min Xi ◽  
Xin Xin Zhang
Keyword(s):  
Direct Synthesis ◽  
Sol Gel ◽  
Acid Base ◽  
Direct Transformation ◽  
Acid Base Titration ◽  
Optimal Reaction Condition ◽  
Superacid Catalyst ◽  
Average Size ◽  
Optimal Reaction ◽  
Xrd And Tem

The newly sulfated nanosolid superacid TiO2/SO4 prepared by sol-gel method was broadly characterized by acid base titration, XRD and TEM, which identified that the superfine solid TiO2/SO4 showing good dispersibility with average size of 27 nm belongs to kind of crystalline nanoparticles. With the help of the catalyst TiO2/SO4, the optimal reaction condition for direct transformation of pyrazole and nitrosonitric acid into 3, 5-Dinitropyrazole was n (pyrazol)=0.10 mol, m (TiO2/SO4 )＝1.5g, V(n-octannol)＝90mL, and V(nitrosonitric acid)＝50mL. Moreover, the optimal yield of the catalytic reaction reached up to 59.4% when the reaction time is 7 hours. The nanosolid superacid catalyst is still of high activity after regenerating eight times by calcination at 600。C.

A silica aerogel as an extractive coating for in-tube solid-phase microextraction to determine polycyclic aromatic hydrocarbons in water samples

2019 ◽  
Vol 11 (45) ◽  
pp. 5784-5792 ◽  
Author(s):  
Xiangping Ji ◽  
Juanjuan Feng ◽  
Chunying Li ◽  
Sen Han ◽  
Jiaqing Feng ◽  
...  
Keyword(s):  
Silica Aerogel ◽  
Solid Phase Microextraction ◽  
Solid Phase ◽  
Ambient Pressure ◽  
High Surface ◽  
Sol Gel ◽  
High Surface Area ◽  
Ambient Pressure Drying ◽  
Acid Base ◽  
Polycyclic Aromatic

A silica aerogel with high surface area was prepared by an acid–base two-step catalytic sol–gel method under ambient pressure drying.

Preparation of SiO2 Antireflective Film by a Base/Acid Two-Step Catalyzed Sol-Gel Process

2013 ◽  
Vol 860-863 ◽  
pp. 845-848 ◽  
Author(s):  
De Yi Li ◽  
Kun Peng ◽  
Ling Ping Zhou ◽  
Jia Jun Zhu
Keyword(s):  
Raw Materials ◽  
Salt Spray ◽  
Sol Gel ◽  
Acid Base ◽  
Gel Method ◽  
Antireflective Film ◽  
Sol Gel Process ◽  
Acid Catalyzed ◽  
Antireflective Films ◽  
Silica Sols

SiO2 antireflective films were prepared by two-step catalyzed sol-gel method with TEOS as the raw materials, acid and ammonia as catalyst. Effects of the ratio of acid-catalyzed and base-catalyzed silica sols on the transmittance and stability of SiO2 film were investigated. The transmittance can be adjusted by change the ratio of base-catalyzed sols, and a higher transmittance can be obtained in the higher ratio of base-catalyzed coatings. A higher stability of SiO2 film in salt spray can be obtained in higher ratio of acid-catalyzed AR coatings. AR coatings with excellent transmittance and stability can be obtained by adjusting the ratio of acid/base catalyzed silica sols.

Sol–gel encapsulation of bromothymol blue pH indicator in presence of Gemini 12-2-12 surfactant

2014 ◽  
Vol 71 (1) ◽  
pp. 16-23 ◽  
Author(s):  
Issa M. El-Nahhal ◽  
Shehata M. Zourab ◽  
Fawzi S. Kodeh ◽  
Fatma H. Abdelsalam
Keyword(s):  
Sol Gel ◽  
Bromothymol Blue ◽  
Ph Indicator

Surface characterization of alumina-supported catalysts prepared by sol–gel method. Part I. Acid–base properties

2001 ◽  
Vol 3 (7) ◽  
pp. 1366-1370 ◽  
Author(s):  
Masaaki Haneda ◽  
c Emmanuel Joubert ◽  
Jean-Christophe Me´ne´zo ◽  
Daniel Duprez ◽  
Jacques Barbier ◽  
...  
Keyword(s):  
Surface Characterization ◽  
Supported Catalysts ◽  
Sol Gel ◽  
Acid Base ◽  
Gel Method ◽  
Sol Gel Method ◽  
Base Properties

An optical fiber biosensor for chlorpyrifos using a single sol–gel film containing acetylcholinesterase and bromothymol blue

Talanta ◽  
2008 ◽  
Vol 74 (4) ◽  
pp. 613-618 ◽  
Author(s):  
Bambang Kuswandi ◽  
Chulaifah Indah Fikriyah ◽  
Agus Abdul Gani
Keyword(s):  
Optical Fiber ◽  
Sol Gel ◽  
Bromothymol Blue ◽  
Gel Film

Fabrication and Characterization for Innate Super-Hydrophilic SiO2 Thin Films

2013 ◽  
Vol 743-744 ◽  
pp. 377-381
Author(s):  
Kai Bo Shen ◽  
Huan Yang ◽  
Jian Liu ◽  
Wei Wang ◽  
Yue Huang ◽  
...  
Keyword(s):  
Thin Films ◽  
Sol Gel ◽  
Acid Base ◽  
Coating Films ◽  
Hydroxyl Content ◽  
Force Microscopy ◽  
Atomic Force ◽  
Inorganic Thin Films ◽  
Ft Ir ◽  
Fabrication And Characterization

Distinguished with photoinduced super-hydrophilic inorganic thin films, non-photoinduced innate super-hydrophilic SiO2 thin films were successfully fabricated in this work. The SiO2 sol was prepared by acid-base two-step sol-gel method. The mix solution containing SiO2 sol and polyethylene glycol (PEG) was coated on glass substrate and then went through thermal treatment to obtain innate super-hydrophilic SiO2 thin films. The films were characterized by atomic force microscopy (AFM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and contact angle meter. The results show that the surface concave-convex microstructure and the hydroxyl content are the factors that endow the SiO2 coating films with innate super-hydrophilic property.

scholarly journals Novel sol–gel prepared zinc fluoride: synthesis, characterisation and acid–base sites analysis

2012 ◽  
Vol 22 (29) ◽  
pp. 14587 ◽  
Author(s):  
Ying Guo ◽  
Stefan Wuttke ◽  
Alexandre Vimont ◽  
Marco Daturi ◽  
Jean-Claude Lavalley ◽  
...  
Keyword(s):  
Sol Gel ◽  
Acid Base

Thermoplastic and thermosetting properties of polyphenylsilsesquioxane particles prepared by two-step acid-base catalyzed sol-gel process

2007 ◽  
Vol 41 (3) ◽  
pp. 217-222 ◽  
Author(s):  
Kenji Takahashi ◽  
Kiyoharu Tadanaga ◽  
Atsunori Matsuda ◽  
Akitoshi Hayashi ◽  
Masahiro Tatsumisago
Keyword(s):  
Sol Gel ◽  
Acid Base ◽  
Sol Gel Process

Fabrication of Anti-Reflective Coatings on Solar Collector Tubes

2011 ◽  
Vol 306-307 ◽  
pp. 125-129 ◽  
Author(s):  
Yu Chao Niu ◽  
Guo Wei Huang ◽  
Ying Chen ◽  
Wen Wen Dou ◽  
De Ming Sun ◽  
...  
Keyword(s):  
Solar Collector ◽  
Sol Gel ◽  
Scratch Resistance ◽  
Scanning Microscope ◽  
Acid Base ◽  
Pencil Hardness ◽  
Reflective Coating ◽  
Atomic Force ◽  
Relative Standard ◽  
Reflective Coatings

In order to reduce the reflection of solar collector cover tube and improve its transmissivity, a kind of SiO2anti-reflective coating on the cover tube was prepared using acid-base two-step sol-gel method. The surface morphology of the anti-reflective coating was observed using atomic force microscope and electronic scanning microscope. The scratch resistance of the coating was tested using pencil hardness apparatus. The transmissivity and anti-impact properties of the cover tube coated with the coating were measured respectively by means of the spectrophotometer and the relative standard method. The results showed that the anti-reflective coating possesses a higher scratch resistance and the coated cover tube has good transmissivity and anti-impact.

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