Kinetic studies of attachment and re-orientation of octyltriethoxysilane for formation of self-assembled monolayer on a silica substrate

Hasan, Abshar; Pandey, Lalit M.

doi:10.1016/j.msec.2016.06.003

Cited by 60 publications

(76 citation statements)

References 48 publications

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“…Conversely, in the case of WNC, two distinct narrow peaks with equal intensities can be distinguished within the band. One of them possibly arises from the stretching of Si–O–C bonds, which usually lies very close in energy and even overlaps with Si–O–Si stretching [ 16 , 27 ]. The presence of this additional peak and the lower width of both peaks indicate a lower extent of cross-linking, which is consistent with the more linear character of siloxane oligomers.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Nanocomposites for the Protection of European Architectural Heritage

et al. 2018

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In the field of stone protection, the introduction of inorganic nanoparticles, such as TiO2, ZnO, and Ag in polymeric blends can enhance the protective action of pristine treatments, as well as confer additional properties (photocatalytic, antifouling, and antibacterial). In the framework of the “Nano-Cathedral” European project, nanostructured photocatalytic protective treatments were formulated by using different TiO2 nanoparticles, solvents, and silane/siloxane systems in the blends. The results about the characterization and application of two promising nano-TiO2 based products applied on Apuan marble and Ajarte limestone are here reported, aiming at investigating the complex system “treatment/stone-substrate”. The nanocomposites show better performances when compared to a commercial reference siloxane based protective treatment, resulting in different performances once applied on different carbonatic substrates, with very low and high open porosity, confirming the necessity of correlating precisely the characteristics of the stone material to those of the protective formulations. In particular, the TiO2 photocatalytic behavior is strictly linked to the amount of available nanoparticles and to the active surface area. The alkyl silane oligomers of the water-based formulation have a good penetration into the microstructure of Ajarte limestone, whereas the solvent-based and small size monomeric formulation shows better results for Apuan marble, granting a good coverage of the pores. The encouraging results obtained so far in lab will be confirmed by monitoring tests aiming at assessing the effectiveness of the treatments applied in pilot sites of historical Gothic Cathedrals.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic Nanocomposites for the Protection of European Architectural Heritage

et al. 2018

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“…Hydrophilicity of the prepared films was analyzed by contact angle goniometer, HO‐IAD‐CAM‐01B (Holmarc, India) using sessile drop method described previously . Briefly, 3 µL droplet of di‐iodomethane (HiMedia, India) was dropped on film sample (2x2 cm 2 size) using automated micro‐syringe system.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and characterization of chitosan, polyvinylpyrrolidone, and cellulose nanowhiskers nanocomposite films for wound healing drug delivery application

Hasan

Waibhaw

Tiwari

et al. 2017

J Biomedical Materials Res

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114

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This study describes the preparation of composite film using chitosan (CS) and polyvinylpyrrolidone (PVP) with incorporated cellulose nanowhiskers (CNWs) for drug delivery application. CNWs were prepared by acid hydrolysis of cellulose with sulfuric acid. Field emission scanning electron microscopy studies revealed nanofibrous morphology of CNWs with 20-30 nm diameter and 200-250 nm in length. X-ray powder diffraction analysis confirmed highly crystalline nature of CNWs with 92.81% crystallinity. Incorporation of CNWs enhanced the thermal and mechanical properties of films. Fourier transform infrared spectroscopy data showed physical interactions between polymer-polymer and polymer-drug. Films prepared with CNWs showed improved swelling behavior which resulted in sustained drug release from polymeric matrix. In vitro curcumin release data were fitted with two-step release model; Step 1 as desorption from the outer surface of the film, and Step 2 as diffusion from within the film and subsequent desorption. The release kinetics confirmed biphasic release profile with different release rates along with diffusion controlled curcumin release. Prepared films showed high biocompatibility with excellent antibacterial activities. Overall, the performed studies confirmed CS-PVP-CNWs based release system can as a potential candidate for wound dressing applications with sustained drug release. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 105A: 2391-2404, 2017.

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“…Amine and carboxylic SAMs are reported to be hydrophilic with a water contact angle of 62 ± 2° and 40 ± 2°, respectively [24]. Hydrophobic, methyl, and octyl (alkyl) SAMs resulted in the contact angle of ≥ 100° [20,34]. A mixed and hybrid SAMs showed intermediate wettability of 80 ± 2° [19].…”

Section: Surface Engineering and Detection Strategiesmentioning

confidence: 99%

Design of engineered surfaces for prospective detection of SARS-CoV-2 using quartz crystal microbalance-based techniques

Pandey

2020

Expert Review of Proteomics

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Introduction: Rapid transmission of the severe acute respiratory syndrome coronavirus 2 has affected the whole world and forced it to a halt (lockdown). A fast and label-free detection method for the novel coronavirus needs to be developed along with the existing enzyme-linked immunosorbent assay (ELISA) and reverse transcription polymerase chain reaction (RT-PCR)-based methods. Areas covered: In this report, biophysical aspects of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spike glycoprotein are outlined based on its recent reported electron microscopy structure. Protein binding sites are analyzed theoretically, which consisted of hydrophobic and positive charged amino acid residues. Different strategies to form mixed self-assembled monolayers (SAMs) of hydrophobic (CH 3) and negatively charged (COOH) groups are discussed to be used for the specific and strong interactions with spike protein. Bio-interfacial interactions between the spike protein and device (sensor) surface and its implications toward designing suitable engineered surfaces are summarized. Expert opinion: Implementation of the engineered surfaces in quartz crystal microbalance (QCM)based detection techniques for the diagnosis of the novel coronavirus from oral swab samples is highlighted. The proposed strategy can be explored for the label-free and real-time detection with sensitivity up to ng level. These engineered surfaces can be reused after desorption.

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Kinetic studies of attachment and re-orientation of octyltriethoxysilane for formation of self-assembled monolayer on a silica substrate

Cited by 60 publications

References 48 publications

Photocatalytic Nanocomposites for the Protection of European Architectural Heritage

Photocatalytic Nanocomposites for the Protection of European Architectural Heritage

Fabrication and characterization of chitosan, polyvinylpyrrolidone, and cellulose nanowhiskers nanocomposite films for wound healing drug delivery application

Design of engineered surfaces for prospective detection of SARS-CoV-2 using quartz crystal microbalance-based techniques

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