Photochemical and Thermal Isomerization of Azobenzene Derivatives in Sol-Gel Bulk Materials

1994 ◽  
Vol 6 (10) ◽  
pp. 1771-1775 ◽  
Author(s):  
Masahide Ueda ◽  
Haeng-Boo Kim ◽  
Kunihiro Ichimura
RSC Advances ◽  
2018 ◽  
Vol 8 (21) ◽  
pp. 11580-11588 ◽  
Author(s):  
Xiao-Mei Liu ◽  
Xing-Yi Jin ◽  
Zhi-Xiang Zhang ◽  
Jian Wang ◽  
Fu-Quan Bai

Quantum chemical calculations of a set of valid photoswitches of azobenzene compounds, with the aim of describing their thermal isomerization.


2006 ◽  
Vol 950 ◽  
Author(s):  
Sabrina Jedlicka ◽  
Silas J. Leavesley ◽  
Kenneth M Little ◽  
J. Paul Robinson ◽  
David E. Nivens ◽  
...  

ABSTRACTFunctional relationships between the biomaterial interface and extracellular matrix (ECM) proteins are intimately involved in cellular adhesion and function. Structural changes of ECM proteins upon adsorption to a surface alter the protein's biological activity by varying the availability of molecular binding sites. Recent work using native and organically modified sol-gel silica as a neuronal biointerface revealed that changes in surface nanotopography of bulk versus thin film materials result in dramatic differences in fibronectin structure, cell survival, and neuronal differentiation. In order to further investigate interactions between chemical functionality and surface topography, we evaluated the global conformation of human fibronectin adsorbed to seven different organically modified silica gels and thin films. Chemical functional groups were introduced into the materials either by altering the starting precursor or by doping with poly-l-lysine or polyethylenimine. Surface topography measurements by atomic force microscopy show that films have surface features less than 25 nm while bulk materials of the same precursor chemistry have features ranging from 50 – 100 nm in size. Fluorescence resonance energy transfer spectroscopy (FRET) revealed a strong interaction between surface topography and chemical functionality. Fibronectin remain globular on all bulk materials regardless of chemical modification. The same changes in precursors or dopant chemistry, however, induced changes in the conformation of fibronectin on the thin films. The differentiation of PC12 cells on the surface indicated a strong impact of the surface features and suggest a possible optimal fibronectin folding state.


2000 ◽  
Vol 11 (0) ◽  
pp. 87-93 ◽  
Author(s):  
S. A. Ennaciri ◽  
K. Malka ◽  
C. Louis ◽  
P. Barboux ◽  
C. R'kha ◽  
...  

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 988
Author(s):  
Kui Zheng ◽  
Jie Zhu ◽  
Haifeng Liu ◽  
Xingquan Zhang ◽  
Enze Wang

A superhydrophobic material was prepared by a simple and easily accessed sol-gel method using epoxy resin (E-51) and γ-aminopropyltriethoxysilane (KH-550) as the precursors, aqueous ammonia (NH4OH) as the catalyst and hydrogenated silicone oil (PMHS) as the hydrophobic modifier, and then pelleting the final product. The morphologies, surface chemical properties and thermal stability of the superhydrophobic bulk materials were characterized by scanning electron microscopy, Fourier infrared spectrometry and thermal analyzer. The hydrophobic properties and repairability of the as-prepared materials were also studied. The results showed that the prepared epoxy resin-hydrogenated silicone oil bulk materials were composed of tightly bound nanoparticles with a size of 50–100 nm in diameter. The material showed excellent superhydrophobic properties with a surface contact angle of 152°. The material also had good thermal resistance with a heat-resistant temperature of 300 °C and showed good repairability. The epoxy resin-hydrogenated silicone oil bulk superhydrophobic material exhibited excellent performance and showed wide application prospects.


CrystEngComm ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 218-227 ◽  
Author(s):  
Jelena Bijelić ◽  
Anamarija Stanković ◽  
Brunislav Matasović ◽  
Berislav Marković ◽  
Mirjana Bijelić ◽  
...  

Characterization of nanocrystalline triple perovskites synthesized by a novel modified sol–gel route instead of bulk materials synthesized by a solid-state route.


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