scholarly journals Modeling the Properties of Curcumin Derivatives in Relation to the Architecture of the Siloxane Host Matrices

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 267
Author(s):  
Florentina Monica Raduly ◽  
Valentin Rădiţoiu ◽  
Alina Rădiţoiu ◽  
Adriana Nicoleta Frone ◽  
Cristian Andi Nicolae ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Optical Properties ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Alcoholic Solution ◽  
Silica Network ◽  
Bioactive Coatings ◽  
Curcumin Derivatives ◽  
Optical Films ◽  
Host Matrices

Research in the field of natural dyes has constantly focused on methods of conditioning curcumin and diversifying their fields of use. In this study, hybrid materials were obtained from modified silica structures, as host matrices, in which curcumin dyes were embedded. The influence of the silica network structure on the optical properties and the antimicrobial activity of the hybrid materials was monitored. By modifying the ratio between phenyltriethoxysilane:diphenyldimethoxysilane (PTES:DPDMES), it was possible to evaluate the influence the organosilane network modifiers had on the morphostructural characteristics of nanocomposites. The nanosols were obtained by the sol–gel method, in acid catalysis. The nanocomposites obtained were deposited as films on a glass support and showed a transmittance value (T measured at 550 nm) of around 90% and reflectance of about 11%, comparable to the properties of the uncovered support. For the coatings deposited on PET (polyethylene terephthalate) films, these properties remained at average values of T550 = 85% and R550 = 11% without significantly modifying the optical properties of the support. The sequestration of the dye in silica networks reduced the antimicrobial activity of the nanocomposites obtained, by comparison to native dyes. Tests performed on Candida albicans fungi showed good results for the two curcumin derivatives embedded in silica networks (11–18 mm) by using the spot inoculation method; in comparison, the alcoholic dye solution has a spot diameter of 20–23 mm. In addition, hybrids with the CA derivative were the most effective (halo diameter of 17–18 mm) in inhibiting the growth of Gram-positive bacteria, compared to the curcumin derivative in alcoholic solution (halo diameter of 21 mm). The results of the study showed that the presence of 20–40% by weight DPDMES in the composition of nanosols is the optimal range for obtaining hybrid films that host curcumin derivatives, with potential uses in the field of optical films or bioactive coatings.

Synthesis and Optical Properties of Sol-Gel Hybrid Materials that Contain Perfluorocyclobutyl Groups

2006 ◽  
Vol 27 (16) ◽  
pp. 1330-1334 ◽  
Author(s):  
Kwan-Soo Lee ◽  
Jae-Pil Kim ◽  
Ho-Suk Song ◽  
Won-Guen Jang ◽  
Young-Sik Park ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hybrid Materials ◽  
Sol Gel

Photodynamic efficiency of porphyrins encapsulated in polysilsesquioxanes

2012 ◽  
Vol 66 (4) ◽  
Author(s):  
Renata Rychtáriková ◽  
Stanislav Šabata ◽  
Jiří Hetflejš ◽  
Gabriela Kuncová
Keyword(s):  
Antimicrobial Activity ◽  
Optical Properties ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
E Coli ◽  
Mesoporous Organosilica

AbstractMesoporous organosilica-porphyrin composites were obtained by entrapment of 5,10,15,20-tetraphenylporphyrin (TPP) and 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin (TMPyP) into three polysilsesquioxanes prepared by the sol-gel method from 1,2-bis(triethoxysilyl)ethane, 1,6-bis(triethoxysilyl)hexane, and 1,8-bis(triethoxysilyl)octane. The materials were characterised by their texture and optical properties (fluorescence and absorbance) and by light-induced antimicrobial activity against E. coli BL21(DE3) (pET16bDsRed) strain.

Arsenic Removal via Cellulose-Based Organic/Inorganic Hybrid Materials from Drinking Water

2012 ◽  
Vol 730-732 ◽  
pp. 563-568
Author(s):  
Catarina Martins ◽  
Rui F. Duarte ◽  
Maria C.F. Magalhães ◽  
Dmitry Evtuguin
Keyword(s):  
Aqueous Solutions ◽  
Hybrid Materials ◽  
Arsenic Removal ◽  
Sol Gel ◽  
Arsenic Concentration ◽  
Cellulose Fiber ◽  
Silica Network ◽  
Bleached Pulp ◽  
Removal Of Arsenic

Cellulose/silica derived hybrids materials (CSH), functionalized with aluminium, calcium, and propylammonium ions, were tested for their possible use in the removal of arsenic from aqueous solutions with controlled compositions to levels lower than 10 μg As/L. CSH were synthesized by sol-gel method using bleached pulp, as source of cellulose fiber, and tetraethoxysilane (TEOS) as main silica precursor. The silica network, made in situ, contained various anchored cations such as propylammonium (CSH-PA), aluminium (CSH-Al) and, calcium (CSH-Ca). Thin films or mesoparticles of silica were deposited on cellulose fibers as shown by SEM and XRD. These hybrid materials were immersed in controlled ionic strength aqueous solutions with arsenic concentrations lower than 0.2 mg As/L. The best performance was shown by CSH-PA that was able to remove a maximum of 20 % of the total arsenic concentration.

Syntheses and optical properties of hybrid materials containing azobenzene groups via sol–gel process for reversible optical storage

2006 ◽  
Vol 100 (6) ◽  
pp. 4811-4818 ◽  
Author(s):  
Mi-Ra Kim ◽  
Young-Il Choi ◽  
Sang-Wook Park ◽  
Jae-Wook Lee ◽  
Jin-Kook Lee
Keyword(s):  
Optical Properties ◽  
Hybrid Materials ◽  
Sol Gel ◽  
Optical Storage ◽  
Sol Gel Process ◽  
Azobenzene Groups

scholarly journals Peculiarities of Synthesis and Properties of Lignin–Silica Nanocomposites Prepared by Sol-Gel Method

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 950 ◽  
Author(s):  
Tetyana Budnyak ◽  
Selda Aminzadeh ◽  
Ievgen Pylypchuk ◽  
Anastasia Riazanova ◽  
Valentin Tertykh ◽  
...  
Keyword(s):  
Hybrid Materials ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
2D Nmr ◽  
Physicochemical Characteristics ◽  
Size Exclusion ◽  
Silica Network ◽  
Silica Nanocomposites ◽  
Air Atmosphere ◽  
Exclusion Chromatography

The development of advanced hybrid materials based on polymers from biorenewable sources and mineral nanoparticles is currently of high importance. In this paper, we applied softwood kraft lignins for the synthesis of lignin/SiO2 nanostructured composites. We described the peculiarities of composites formation in the sol-gel process through the incorporation of the lignin into a silica network during the hydrolysis of tetraethoxysilane (TEOS). The initial activation of lignins was achieved by means of a Mannich reaction with 3-aminopropyltriethoxysilane (APTES). In the study, we present a detailed investigation of the physicochemical characteristics of initial kraft lignins and modified lignins on each step of the synthesis. Thus, 2D-NMR, 31P-NMR, size-exclusion chromatography (SEC) and dynamic light scattering (DLS) were applied to analyze the characteristics of pristine lignins and lignins in dioxan:water solutions. X-Ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) were used to confirm the formation of the lignin–silica network and characterize the surface and bulk structures of the obtained hybrids. Termogravimetric analysis (TGA) in nitrogen and air atmosphere were applied to a detailed investigation of the thermal properties of pristine lignins and lignins on each step of modification. SEM confirmed the nanostructure of the obtained composites. As was demonstrated, the activation of lignin is crucial for the sol-gel formation of a silica network in order to create novel hybrid materials from lignins and alkoxysilanes (e.g., TEOS). It was concluded that the structure of the lignin had an impact on its reactivity during the activation reaction, and consequently affected the properties of the final hybrid materials.

A Statistical Approach to the Effect of Sol-Gel Process Variables on the Physical Properties of Polymer [PLLA]-Silica Hybrid Materials for Use as Biomaterials

2002 ◽  
Vol 726 ◽  
Author(s):  
Carole C. Perry ◽  
David Eglin ◽  
Saad A.M. Ali ◽  
Sandra Downes
Keyword(s):  
Hybrid Materials ◽  
Sol Gel ◽  
Organic Polymer ◽  
Molar Ratio ◽  
Interpenetrating Networks ◽  
Silica Network ◽  
Scanning Calorimetry ◽  
Synthesis Conditions ◽  
Molar Ratios ◽  
Physical Form

AbstractHybrid poly(L-lactic acid)-silica materials for potential use in orthopaedic applications have been prepared by a sol-gel method using an experimental design approach to investigate the effect of synthesis variables separately and together on the physical form of the organic polymer. The five factors investigated were the molar ratios of tetraethyl orthosilicate (TEOS)/Poly(Llactic acid) (PLLA), Toluene/PLLA, EtOH/TEOS, Water/TEOS and HCl (catalyst)/TEOS. All other synthesis conditions were kept constant. X-Ray powder diffraction (Statton's graphical method) and differential scanning calorimetry were used to assess the extent of polymer crystallinity in the hybrid materials. In accordance with other studies, increasing the molar ratio of TEOS/PLLA lead to increasing incorporation of the organic polymer into the silica network. Increase of the toluene/PLLA molar ratio lead to an increase in the crystallinity of the polymer phase. As our studies investigated the effect of synthesis variables simultaneously it was possible to identify, for the first time, that interactions between specific reactants are important in the development of the two structural components of this hybrid system. The most important of these was the TEOS/PLLA*H2O/TEOS interaction that may indicate that silica species from hydrolysed TEOS interact with the PLLA phase possibly via hydrogen bonding and leads to the lowering of the crystalline order of the polymer The results from this study give useful information on the ability of the organic polymer and the silica phase to form interpenetrating networks, an important requirement for the generation of a potential hybrid polyester-silica biomaterial for orthopaedic applications.

Thermal and optical properties of PMMA-titania hybrid materials prepared by sol-gel approach with HEMA as coupling agent

2004 ◽  
Vol 94 (1) ◽  
pp. 400-405 ◽  
Author(s):  
Jui-Ming Yeh ◽  
Chang-Jian Weng ◽  
Kuan-Yeh Huang ◽  
Hsi-Ya Huang ◽  
Yuan-Hsiang Yu ◽  
...  
Keyword(s):  
Optical Properties ◽  
Hybrid Materials ◽  
Coupling Agent ◽  
Sol Gel

Improved Sol-Gel Materials for Efficient Solid State Dye Lasers

1993 ◽  
Vol 329 ◽  
Author(s):  
Michael Canva ◽  
Patrick Georges ◽  
Jean-Fran^ois Perelgritz ◽  
Alain Brun ◽  
Fréddric Chaput ◽  
...  
Keyword(s):  
Solid State ◽  
Physical Properties ◽  
Room Temperature ◽  
Sol Gel ◽  
Tunable Lasers ◽  
Optical Quality ◽  
Dye Lasers ◽  
Laser Dyes ◽  
Host Matrix ◽  
Host Matrices

AbstractPhotoresistant laser dyes were trapped in silica based xerogel host matrices to obtain solid state tunable lasers. For this purpose very dense xerogel samples with improved chemical and physical properties were prepared at room temperature by the sol-gel technology. The as-prepared materials were polished to obtain optical quality surfaces and were used as new lasing media.Lasing action of such different dyes as rhodamine, perylene and pyrromethene doping dense sol-gel matrices was demonstrated. Efficiencies of 30 % or lifetimes of more than 100,000 shots were achieved with different new ≤dye dopant/host matrix≥ couples. Their different performances are reviewed and discussed.

Sign in / Sign up

Export Citation Format

Share Document