Sulfated zirconia foams synthesized by integrative route combining surfactants, air bubbles and sol–gel transition applied to heterogeneous catalysis

RSC Advances ◽  
2016 ◽  
Vol 6 (8) ◽  
pp. 6686-6694 ◽  
Author(s):  
Marinalva A. Alves-Rosa ◽  
Leandro Martins ◽  
Peter Hammer ◽  
Sandra H. Pulcinelli ◽  
Celso V. Santilli
Keyword(s):  
Heterogeneous Catalysis ◽  
Sulfated Zirconia ◽  
Sol Gel ◽  
Ceramic Materials ◽  
Air Bubbles ◽  
Catalytic Application ◽  
Sol Gel Transition ◽  
Gel Transition

Creation of macro–mesopores in ceramic materials through air–liquid foaming and sol–gel processes for catalytic application.

Sol – Gel Modelling Associated with the Rheology of Polymeric Precursors of Ceramic Materials

2003 ◽  
Vol 13 (5) ◽  
pp. 251-258 ◽  
Author(s):  
Corneliu Balan ◽  
Ralf Riedel
Keyword(s):  
Reaction Time ◽  
Constitutive Relation ◽  
Sol Gel ◽  
Viscoelastic Behavior ◽  
Ceramic Materials ◽  
Avrami Equation ◽  
Creep Tests ◽  
Polymer Systems ◽  
Sol Gel Transition ◽  
Gel Transition

Abstract A general constitutive relation describing the change of viscoelastic behavior during the liquid - solid (sol - gel) transition which takes place in preceramic polymers is derived on the basis of Jeffrey’s 3-constants model with time dependent viscosities and elasticity. It is postulated that the sol - gel - transition can be analyzed analogous to the solutions of the Avrami equation used for modeling crystallization processes. Two different polymer systems used as precursor for the production of ceramic materials are investigated here: i) a mixture based on polysiloxane, alumatrane and isopropanol; ii) a non-oxidic carbodiimide gel based on the reaction of chlorosi-lanes with bis(trimethylsilyl)carbodiimide. Continuous measurements of the dynamic moduli versus reaction time, as well as creep tests at constant shear stress, evidenced both qualitative similarities and quantitative differences associated with the sol - gel transition of the two polymer systems. The shear rate and viscosity dependence of reaction time in creep tests, respectively the evolution of Lissajous figures associated with oscillatory experiments, are found to be consistent with the numerical simulations of the proposed constitutive relation.

Sol-gel transition in silica alkaline solutions. A NMR study

1994 ◽  
Vol 91 ◽  
pp. 901-908 ◽  
Author(s):  
H Zanni ◽  
P Nieto ◽  
L Fernandez ◽  
R Couty ◽  
P Barret ◽  
...  
Keyword(s):  
Sol Gel ◽  
Alkaline Solutions ◽  
Nmr Study ◽  
Sol Gel Transition ◽  
Gel Transition

scholarly journals Synthesis of Nanogels: Current Trends and Future Outlook

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 36
Author(s):  
Emanuele Mauri ◽  
Sara Maria Giannitelli ◽  
Marcella Trombetta ◽  
Alberto Rainer
Keyword(s):  
3D Printing ◽  
Ad Hoc ◽  
Sol Gel ◽  
Controlled Polymerization ◽  
Current Trends ◽  
Chip Technology ◽  
Physico Chemical ◽  
Physical Interactions ◽  
Sol Gel Transition ◽  
Gel Transition

Nanogels represent an innovative platform for tunable drug release and targeted therapy in several biomedical applications, ranging from cancer to neurological disorders. The design of these nanocarriers is a pivotal topic investigated by the researchers over the years, with the aim to optimize the procedures and provide advanced nanomaterials. Chemical reactions, physical interactions and the developments of engineered devices are the three main areas explored to overcome the shortcomings of the traditional nanofabrication approaches. This review proposes a focus on the current techniques used in nanogel design, highlighting the upgrades in physico-chemical methodologies, microfluidics and 3D printing. Polymers and biomolecules can be combined to produce ad hoc nanonetworks according to the final curative aims, preserving the criteria of biocompatibility and biodegradability. Controlled polymerization, interfacial reactions, sol-gel transition, manipulation of the fluids at the nanoscale, lab-on-a-chip technology and 3D printing are the leading strategies to lean on in the next future and offer new solutions to the critical healthcare scenarios.

Analyzing the Effects of Silica Nanospheres on the Sol–Gel Transition Profile of Thermosensitive Hydrogels

Langmuir ◽  
2021 ◽  
Author(s):  
Lucas S. Ribeiro ◽  
Renata L. Sala ◽  
Leticia A. O. de Jesus ◽  
Sandra A. Cruz ◽  
Emerson R. Camargo
Keyword(s):  
Sol Gel ◽  
Silica Nanospheres ◽  
Thermosensitive Hydrogels ◽  
Sol Gel Transition ◽  
Gel Transition ◽  
Transition Profile
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