Immobilization of bacteria in silica matrices using citric acid in the sol–gel process

2007 ◽  
Vol 73 (5) ◽  
pp. 1059-1064 ◽  
Author(s):  
Gisela S. Alvarez ◽  
Martín F. Desimone ◽  
Luis E. Diaz
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Sol Gel Process ◽  
Silica Matrices

Synthesis of BaMoO4 Nanocrystallites Using Sol-Gel Process

2012 ◽  
Vol 535-537 ◽  
pp. 469-472
Author(s):  
Quan Zheng Zhang
Keyword(s):  
Citric Acid ◽  
Optical Property ◽  
Sol Gel ◽  
Sol Gel Process

BaMoO4nanocrystallites were synthesized successfully using Sol-gel process with (NH4)6Mo7O24•4H2O, BaCl2•2H2O, citric acid and PEG400 as original materials. The result shows that well-crystallized BaMoO4nanoparticles were formed at 600°C with size of ca.50nm. The synthesized BaMoO4nanocrystallites were characterized by XRD and IR, and the optical property was studied as well.

scholarly journals Sol-gel synthesis of α-Al2O3 with enhanced porosity via dicarboxylic acid templating

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Simon Carstens ◽  
Christian Splith ◽  
Dirk Enke
Keyword(s):  
Citric Acid ◽  
Thermal Analyses ◽  
Sol Gel ◽  
Dicarboxylic Acids ◽  
Precise Control ◽  
Sol Gel Process ◽  
Successful Establishment ◽  
The One ◽  
Α Al2o3 ◽  
Sol Gel Synthesis

AbstractOne of the major routes to synthesize macroporous α-Al2O3 is the sol-gel process in presence of templates. Templates include polymers as well as carboxylic acids, such as citric acid. By careful choice of the template, pore diameters can be adjusted between 110 nm and several µm. We report the successful establishment of plain short-chain dicarboxylic acids (DCA) as porogenes in the sol-gel synthesis of macroporous α-Al2O3. By this extension of the recently developed synthesis route, a very precise control of pore diameters is achieved, in addition to enhanced macropore volumes in α-Al2O3. The formation mechanism thereof is closely related to the one postulated for citric acid, as thermal analyses show. However, since branching in the DCA-linked alumina nuclei is not possible, close monomodal pore width distributions are attained, which are accompanied by enhanced pore volumes. This is a significant improvement in terms of controlled enhanced porosity in the synthesis of macroporous α-Al2O3.

Al-Substituted Li[Li(1/3-x/3)Crx-0.05M0.05Mn(2/3-2x/3)]O2 Cathode Synthesized via Sol-Gel Process

2007 ◽  
Vol 124-126 ◽  
pp. 631-634 ◽  
Author(s):  
I. Ruth Mangani ◽  
C.W. Park ◽  
Y.K. Yoon ◽  
S.H. Kim ◽  
J. Kim
Keyword(s):  
Citric Acid ◽  
Cathode Material ◽  
Discharge Capacity ◽  
Current Density ◽  
Sol Gel ◽  
Initial Discharge Capacity ◽  
Initial Discharge ◽  
Sol Gel Process ◽  
A Current ◽  
Effect Of Doping

This work reports the effect of doping aluminium in the Li[Li(1/3-x/3)Crx-0.05M0.05Mn(2/3- 2x/3)]O2 (x= 0.2; M= Al), layered cathode material. The cathode material was prepared by citric acid assisted sol-gel process. The sample is characterized by TG/DTA, XRD and FESEM measurements. The Al- doped cathode has delivered an initial discharge capacity of 250 mAh/g with a current density of 0.12 mA/cm2.

Ni/SiO2 prepared by sol–gel process using citric acid

2003 ◽  
Vol 66 (2-3) ◽  
pp. 197-208 ◽  
Author(s):  
Ryoji Takahashi ◽  
Satoshi Sato ◽  
Toshiaki Sodesawa ◽  
Masanori Suzuki ◽  
Nobuyuki Ichikuni
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Sol Gel Process

scholarly journals Mesoporous silica matrices derived from sol-gel process assisted by low power ultrasonic activation

2009 ◽  
Vol 3 (1-2) ◽  
pp. 59-64 ◽  
Author(s):  
Cecilia Savii ◽  
László Almásy ◽  
Claudia Ionescu ◽  
Kinga Székely ◽  
Corina Enache ◽  
...  
Keyword(s):  
Low Power ◽  
Size Distribution ◽  
Rough Surface ◽  
Sol Gel ◽  
Silica Gels ◽  
Synthesis Process ◽  
Ultrasonic Activation ◽  
Sol Gel Process ◽  
Power Ultrasonic ◽  
Silica Matrices

The present work contributes to elucidating the differences between silica gels obtained by low doses ultrasonic activation, and those obtained by the conventional method, termed as classical sol gel. Silica matrices were produced by sol-gel synthesis process, assisted and non-assisted by an ultrasonic field, and subsequently characterized by various methods. Nitrogen adsorption and small-angle neutron scattering (SANS) measurements provided texture and microstructure of the dried gels. The adsorption results show that the sample sonicated for 2 hours presents the most ordered microstructure, characterized by pore shape close to spherical and the narrowest size distribution - about 90 % of the pores for this sample fall into the mesopore range (2-50 nm). SANS data reveal the formation of primary structural units of sizes around 1.5-2 nm which are small linear or branched polymeric species of roughly spherical shape and with rough surface. They are generated in the very early stage of sol gel process, as a result of hydrolysis and condensation reactions. The aggregated primary units form the secondary porous structure which can be described as a rough surface with fractal dimension above 2. The best porosity characteristics were obtained for the sample activated for 2 hours, indicating the optimal doses of sonication in the present conditions. Our results demonstrate the possibility of tailoring the pore size distribution using a low power ultrasonic bath. .

Citrate complexing sol–gel process of lead-free (K,Na)NbO3 ferroelectric films

2016 ◽  
Vol 30 (13) ◽  
pp. 1650157 ◽  
Author(s):  
Linlin Yao ◽  
Kongjun Zhu
Keyword(s):  
Thin Films ◽  
Citric Acid ◽  
Sol Gel ◽  
Ferroelectric Thin Films ◽  
Raw Material ◽  
Lead Free ◽  
Ferroelectric Films ◽  
Sol Gel Process ◽  
Porous Morphology ◽  
Loop Measurement

The citrate complexing sol–gel process to fabricate lead-free (K,[Formula: see text]Na)NbO3 ferroelectric thin films was studied. Soluble niobium source of niobium–citric acid (Nb–CA) solution was utilized as a raw material to synthesize (K,[Formula: see text]Na)NbO3 thin films, by pyrolyzing at 450–550[Formula: see text]C and annealing at 650[Formula: see text]C. The film pyrolyzed at 450[Formula: see text]C shows poor crystallization with porous morphology, whereas the film pyrolyzed at 550[Formula: see text]C appear to be well-crystallized and denser, and the ferroelectricity was also proved by the [Formula: see text]–[Formula: see text] hysteresis loop measurement.

Synthesis of Spherical La2Mo2O9 Nanoparticles Using Sol-Gel Process

2014 ◽  
Vol 933 ◽  
pp. 8-11
Author(s):  
Quan Zheng Zhang ◽  
Yu Ting Wang ◽  
Xuan Cheng ◽  
Xiao Liu ◽  
Yan Qin Zhang ◽  
...  
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Sol Gel Process

La2Mo2O9nanoparticles were synthesized successfully using Sol-gel process with (NH4)6Mo7O24·4H2O, La (NO3)3·6H2O and citric acid as original materials. The result shows that well-crystallized spherical La2Mo2O9nanoparticles were formed at 600°C with sizes ofca.50~80 nm. The synthesized La2Mo2O9nanopartile were characterized by XRD, TEM and IR, respectively.

scholarly journals Functionalization of Si-C Using TEOS (Tetra Ethyl Ortho Silica) as Precursor and Organic Catalyst

2020 ◽  
Vol 148 ◽  
pp. 07008 ◽  
Author(s):  
Riani Ayu Lestari ◽  
Muthia Elma ◽  
Erdina Lulu Atika Rampun ◽  
Anna Sumardi ◽  
Adhe Paramitha ◽  
...  
Keyword(s):  
Citric Acid ◽  
Sol Gel ◽  
Acid Catalyst ◽  
Silica Xerogel ◽  
Silica Network ◽  
Infrared Band ◽  
Oh Groups ◽  
Structured Materials ◽  
Sol Gel Process ◽  
Organic Catalyst

Silica network was tailored configuring siloxane (Si-O-Si) and silanol (Si-OH) groups which are essential to produce porous-structured materials. As silanols are hydrophilic, react with water to form fouling. This research address to actualize strategy for synthesizing highly functionalized silica carbon (Si-C) using hybrid organic-inorganic structures as the primary method for improving hydro-stability by employing precursor TEOS and organic catalyst through a sol-gel process. Catalysis employs citric acid or citric acid-ammonia whereas carbon templated into silica network. The synthesis scheme involves: a) sol-gel process at 0°C and b) calcination. Silica sol dried into xerogels were prepared and calcined at 200°C and 250°C. Characterization of xerogels showed the infrared band areas of the organic groups to evaluate the thermal stability. For xerogel employed single (pH 5.5) and dual (pH 7.65) catalyst, infrared spectra showed mostly look similar Si-C area at similar wavelength. Silica xerogel is more effectively prepared from TEOS with one-step single acid catalyst including calcination.

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