scholarly journals Controllability of pore size on macroporous sol-gel silica films embedding rhodamine 6G

2021 ◽  
Vol 19 (2) ◽  
pp. 87-97
Author(s):  
J. Castañeda Contreras ◽  
H. Pérez Ladrón de Guevara ◽  
M. A. Menéses Nava ◽  
V. F. Marañón Ruiz ◽  
R. Chiu Zarate ◽  
...  
Keyword(s):  
Pore Size ◽  
Spin Coating ◽  
Pore Formation ◽  
Rhodamine 6G ◽  
Sol Gel ◽  
Film Surface ◽  
Silica Films ◽  
Macroporous Silica ◽  
Charged Species ◽  
Evaporation And Condensation

A facile method is reported to synthesize macroporous silica films embedding rhodamine 6G. The films were obtained by sol-gel and spin-coating processes. Results pointed out a dependence of pore formation on the addition of rhodamine 6G in the film composition. The probable formation process of the pores was attributed to the aggregation of charged species from rhodamine 6G. Although the pores were randomly distributed on the film surface, the pore size was tuned at certain extent by controlling the evaporation and condensation rates at early stages of spin coating. Results indicated that the evaporation rate determined the pore size distribution of the films.

Characterization of the Surface Area and Porosity of Sol-Gel Films Using Saw Devices

1988 ◽  
Vol 121 ◽  
Author(s):  
Gregory C. Frye ◽  
Antonio J. Ricco ◽  
Stephen J. Martin ◽  
C. Jeffrey Brinker
Keyword(s):  
Pore Size ◽  
Surface Area ◽  
Adsorption Isotherms ◽  
Sol Gel ◽  
Film Surface ◽  
Nitrogen Adsorption ◽  
Porous Films ◽  
Pore Size Distributions ◽  
Test Film ◽  
Sol Gel Films

ABSTRACTA novel technique for accurately obtaining nitrogen adsorption isotherms on thin porous films has been developed. These isotherms are useful for characterizing the surface area and pore size distribution of porous samples. The sensitivity to adsorbed nitrogen is increased by several orders of magnitude over conventional techniques by forming the test film on the substrate of a surface acoustic wave (SAW) device. This device functions as a microbalance able to detect less than 100 pg/cm2 of film. Surface areas and pore size distributions calculated from adsorption isotherms obtained with this technique on silicate sol-gel films are compared to those for bulk samples prepared from similar sol-gel solutions.

Microstructural Analysis of Disordered and Ordered Mesoporous Silica Films

1998 ◽  
Vol 4 (S2) ◽  
pp. 726-727
Author(s):  
C. A. Drewien ◽  
Y. Lu ◽  
C. J. Brinker ◽  
R. Ganguli ◽  
M. T. Anderson
Keyword(s):  
Mesoporous Silica ◽  
Pore Size ◽  
Size Structure ◽  
Sol Gel ◽  
Microstructural Analysis ◽  
Dip Coating ◽  
Inorganic Membranes ◽  
Cross Sectional ◽  
Silica Films ◽  
Plan View

Processing can be controlled to produce a family of mesoporous silica films with either disordered, lamellar, hexagonal, or cubic pore distributions[l]. These films, formed by surfactant-templated synthesis and exhibiting a unimodal pore size, promise potential use as inorganic membranes, catalysts, and optically-based sensors[l,2]. The mesoporous films can be formed from initially homogeneous silica sols by a continuous, surfactant-templated process, which relies upon solvent evaporation during the sol-gel dip-coating process. Films of 100-500 nm thick are formed within seconds in a continuous coating operation. The microstructure of the films is dependent upon the cationic surfactant concentration CTAB (CH3(CH2)15N+(CH3)3Br-) and the dip-coating rate. Several films, processed under differing conditions, were investigated by TEM to characterize pore size, structure, and orientation.Figures 1 a & b show the plan view and cross-sectional microstructure of a 2-d hexagonal mesoporous silica film deposited on silicon; the sample was calcined at 400 °C for 3 hours in air. The images were obtained on a Philips CM30 TEM, operated at 300 kV.

Research on Nano Porous Cu Films Prepared by Sol-Gel Method

2011 ◽  
Vol 415-417 ◽  
pp. 606-610 ◽  
Author(s):  
Hui Jun Zhang ◽  
Ming Yu Li ◽  
Qing Xuan Zeng ◽  
Chang Gen Feng
Keyword(s):  
Grain Size ◽  
Pore Size ◽  
Spin Coating ◽  
Sol Gel ◽  
Chelating Agent ◽  
Raw Material ◽  
Spin Coating Technique ◽  
Gel Method ◽  
Cu Films ◽  
Coating Technique

Nanocrystalline porous Cu films were prepared on glass subtrates by sol-gel spin coating technique with copper(II) acetate as raw material and NH(C2H2OH)2as chelating agent. The characteristics of films were analyzed by IR, TG-DTG, XRD and SEM. The structure of Cu films was remarkable influenced by sol concentration and PEG content. The effects of calcining temperature and the way of the gelation on grain size were discussed. The results showed that the pore size and density are homogeneous when the sol concentration was 0.6 mol/L and the PEG content was 0.35 g.

scholarly journals Positron annihilation in latex-templated macroporous silica films: pore size and ortho-positronium escape

2012 ◽  
Vol 14 (6) ◽  
pp. 065009 ◽  
Author(s):  
L Liszkay ◽  
F Guillemot ◽  
C Corbel ◽  
J-P Boilot ◽  
T Gacoin ◽  
...  
Keyword(s):  
Pore Size ◽  
Positron Annihilation ◽  
Silica Films ◽  
Macroporous Silica

Vegetal nanoclusters in hybrid silica films prepared by sol-gel spin coating technique

2011 ◽  
Vol 357 (7) ◽  
pp. 1716-1723 ◽  
Author(s):  
I. Lacatusu ◽  
N. Badea ◽  
A. Murariu ◽  
C. Pirvu ◽  
A. Meghea
Keyword(s):  
Spin Coating ◽  
Sol Gel ◽  
Spin Coating Technique ◽  
Silica Films ◽  
Coating Technique ◽  
Hybrid Silica

Heat treatment of spun-on acid-catalyzed sol-gel silica films

1994 ◽  
Vol 9 (3) ◽  
pp. 723-730 ◽  
Author(s):  
T.M. Parrill
Keyword(s):  
Heat Treatment ◽  
Refractive Index ◽  
Spin Coating ◽  
Compressive Strain ◽  
Sol Gel ◽  
Silica Films ◽  
Si Substrates ◽  
Acid Catalyzed ◽  
Film Porosity

SiO2 films, formed by spin coating acid-catalyzed TEOS-based sol-gel on Si substrates, were annealed at 300–1000 °C and analyzed using ellipsometry, FTIR, and in situ stress measurements. Film porosity ranged from an average of 28% before annealing to 7% after annealing 3 h at 1000 °C. Below ≍800 °C, water and silanol removal caused a decrease in refractive index and increase in the in-plane tensile stress. Infrared spectra indicated compressive strain normal to the plane, however. Above ≍800 °C, further densification and structural relaxation occurred. Exposure to H2O also caused relaxation after annealing, as the most compressed Si–O–Si units reacted preferentially with moisture.

A New Technique for Synthesizing Nanoporous Silica Films from Sol–Gel and Spin Coating Methods

2007 ◽  
Vol 121-123 ◽  
pp. 81-84
Author(s):  
Jia Cai Kuang ◽  
Da Xiang Yang ◽  
Jian Feng ◽  
Chang Rui Zhang
Keyword(s):  
Spin Coating ◽  
Sol Gel ◽  
New Technique ◽  
Nanoporous Silica ◽  
Silica Films ◽  
Coating Methods ◽  
A New Technique

scholarly journals Polystyrene-block-poly(ethylene oxide) copolymers as templates for stacked, spherical large-mesopore silica coatings: dependence of silica pore size on the PS/PEO ratio

2016 ◽  
Vol 7 ◽  
pp. 1454-1460 ◽  
Author(s):  
Roberto Nisticò ◽  
Giuliana Magnacca ◽  
Sushilkumar A Jadhav ◽  
Dominique Scalarone
Keyword(s):  
Ethylene Oxide ◽  
Pore Size ◽  
Silicon Oxide ◽  
Sol Gel ◽  
High Porosity ◽  
Silica Films ◽  
Systematic Analysis ◽  
Silica Coatings ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

Large-mesopore silica films with a narrow pore size distribution and high porosity have been obtained by a sol–gel reaction of a silicon oxide precursor (TEOS) and using polystyrene-block-poly(ethylene oxide) (PS-b-PEO) copolymers as templates in an acidic environment. PS-b-PEO copolymers with different molecular weight and composition have been studied in order to assess the effects of the block length on the pore size of the templated silica films. The changes in the morphology of the porous systems have been investigated by transmission electron microscopy and a systematic analysis has been carried out, evidencing the dependence between the hydrophilic/hydrophobic ratio of the two polymer blocks and the size of the final silica pores. The obtained results prove that by tuning the PS/PEO ratio, the pore size of the templated silica films can be easily and finely predicted.

Sign in / Sign up

Export Citation Format

Share Document