Bioinspired Nanomaterials

2021 ◽  
Keyword(s):  
Drug Delivery ◽  
Electrochemical Sensors ◽  
Low Cost ◽  
Nanocomposite Materials ◽  
Biological Synthesis ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Bioinspired Nanomaterials ◽  
The Stability

Biological synthesis employing microorganisms, fungi or plants is an alternative method to produce nanoparticles in low-cost and eco-friendly ways. The book covers the synthesis of metal nanoparticles, metal oxide nanostructures and nanocomposite materials, as well as the stability and characterization of bioinspired nanomaterials. Applications include optical and electrochemical sensors, packaging, SERS and drug delivery processes.

Synthesis and characterization of hyperbranched poly (sulfone-amine) modified β-cyclodextrin

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
Liang Chen ◽  
Peng He ◽  
Zhifeng Jia ◽  
Xinyuan Zhu ◽  
Deyue Yan
Keyword(s):  
Drug Delivery ◽  
Low Cost ◽  
Food Additives ◽  
Synthesis And Characterization ◽  
Good Solubility ◽  
Low Viscosity ◽  
Hyperbranched Poly ◽  
Potential Applications ◽  
Inclusion Ability

AbstractAn economical strategy to prepare hyperbranched poly(sulfone-amine) modified β-cyclodextrins (HPSA-m-CDs) from natural β-cyclodextrin (β-CD) and other commercially available materials has been reported. The final product has many good properties of hyperbranched poly(sulfone-amine)s (good solubility, low viscosity etc.), while its inclusion ability can also be well kept. It is a feasible approach to prepare functionalized modified cyclodextrin at very low cost, and may have potential applications in the fields of catalysis, drug delivery, food additives, etc.

Diffuse reflectance spectroscopic analysis of barium sulfate as a reflection standard within 173–2500 nm: From pure to sintered form

2019 ◽  
Vol 27 (6) ◽  
pp. 393-401
Author(s):  
Abdul Halim Poh ◽  
Mohd Fadzil Jamaludin ◽  
Iman Aris Fadzallah ◽  
Nik Muhd Jazli Nik Ibrahim ◽  
Farazila Yusof ◽  
...  
Keyword(s):  
Barium Sulfate ◽  
Diffuse Reflectance ◽  
Spectroscopic Analysis ◽  
Low Cost ◽  
Salt Form ◽  
Pure Salt ◽  
The Stability ◽  
High Consistency ◽  
High Reflection

The use of barium sulfate (BaSO4) as a low-cost reflectance standard has been documented for some time. In its pure salt form, the optical characteristics do have advantages compared to laboratory-grade sintered polytetrafluoroethylene (PTFE). However, its practical use has little advantage against the stability of PTFE. In this paper, a process of producing pelletized BaSO4, and characterization of its optical reflectance properties is reported. In its sintered form, data-driven analysis shows that BaSO4 is a commendable low-cost, high-reflection and a high-consistency material. The current sintered forms, though crude, registers a relatively stable texture to withstand minor mechanical stress, while having up to an average 92% reflectivity across the UV-VIS-NIR range (173–2500 nm) compared to a PTFE reflection standard.

Review—Trends on the Development of Non-Enzymatic Electrochemical Sensors Modified with Metal-Oxide Nanostructures for the Quantification of Uric Acid

2021 ◽  
Author(s):  
Daniel Hernández Ramírez ◽  
L.H. Mendoza-Huizar ◽  
Carlos Andrés Galán Vidal ◽  
G. Y. Aguilar-Lira ◽  
Giaan Arturo Alvarez Romero
Keyword(s):  
Uric Acid ◽  
Metal Oxide ◽  
Electrochemical Sensors ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures

scholarly journals Preparation and Characterization of Hyaluronic Acid-Polycaprolactone Copolymer Micelles for the Drug Delivery of Radioactive Iodine-131 Labeled Lipiodol

2017 ◽  
Vol 2017 ◽  
pp. 1-8
Author(s):  
Shih-Cheng Chen ◽  
Ming-Hui Yang ◽  
Tze-Wen Chung ◽  
Ting-Syuan Jhuang ◽  
Jean-Dean Yang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Radioactive Tracer ◽  
Cell Uptake ◽  
Hepatic Cells ◽  
Amphiphilic Molecules ◽  
Hydrophobic Tail ◽  
Uptake Activity ◽  
The Stability ◽  
Radioactive Iodine 131

Micelles, with the structure of amphiphilic molecules including a hydrophilic head and a hydrophobic tail, are recently developed as nanocarriers for the delivery of drugs with poor solubility. In addition, micelles have shown many advantages, such as enhanced permeation and retention (EPR) effects, prolonged circulation times, and increased endocytosis through surface modification. In this study, we measured the critical micelle concentrations, diameters, stability, and cytotoxicity and the cell uptake of micelles against hepatic cells with two kinds of hydrophilic materials: PEG-PCL and HA-g-PCL. We used 131I as a radioactive tracer to evaluate the stability, drug delivery, and cell uptake activity of the micelles. The results showed that HA-g-PCL micelles exhibited higher drug encapsulation efficiency and stability in aqueous solutions. In addition, the 131I-lipiodol loaded HA-g-PCL micelles had better affinity and higher cytotoxicity compared to HepG2 cells.

scholarly journals Preanodized Screen Printed Carbon Electrode for Detection of Linalool using Three Terminal Network

2019 ◽  
Vol 9 (2) ◽  
pp. 477-482
Keyword(s):  
Electrochemical Sensors ◽  
Low Cost ◽  
Moving Average ◽  
Chemical Compounds ◽  
Carbon Electrode ◽  
Impedance Plot ◽  
Analytical Instruments ◽  
Screen Printed Carbon Electrode ◽  
The Stability ◽  
Screen Printed

Linalool is a very important flavouring compound found in plants which is used in food and beverages. Linalool has been traditionally detected by analytical instruments such as gas chromatography (GC) coupled with mass spectroscopy(MS) which are not suitable for routine tests. For fast and low cost detection of chemical compounds electrochemial sensors are most suitable. Screen printed carbon electrode (SPCE) is one of the most popular and low cost device used for detection of chemical compounds. In this article we present the detection of linalool using a low cost preannodized commercial screen printed carbon electrode (SPCE). Traditionally electrochemical sensors are used in two terminal mode, however three terminal analysis of electrochemical sensors are found to be more rationale and accurate. In this paper we have analyzed detection of linalool by an advanced three terminal analysis. First we have performed cyclic voltammetry(CV) of the SPCE which showed clear oxidation peaks at different concentration of linalool. The input-output data of the CV has been used for analysis of the impedance of the SPCE.The impedance model of the SPCE was estimated by autoregressive moving average with exogenous inputs(ARMAX) modelling technique using the CV data. The three terminal impedance fitting revealed the values of electrical parameters and the parasitic elements at different linalool concentration. The stability limits of the SPCE was also determined from the pole-zero and Nyquist plots of the estimated models. Impedance behaviour to frequency of the SPCE was further analyzed by impedance plot( 𝒁 vs −𝒁 ′ ) from which we are able to relate the CV scan rate to the impedance of the SPCE. Finally the sensitivity and repeatability of the SPCE was determined using a measurement circuit.

scholarly journals Electrochemical Characterization of Aromatic Molecules with 1,4-Diaza Groups for Flow Battery Applications

Molecules ◽  
2021 ◽  
Vol 26 (8) ◽  
pp. 2227
Author(s):  
Alexandros Pasadakis-Kavounis ◽  
Vanessa Baj ◽  
Johan Hjelm
Keyword(s):  
Large Scale ◽  
Low Cost ◽  
Strong Impact ◽  
Molecular Aggregation ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Aromatic Molecules ◽  
The Rich ◽  
The Stability

The aqueous redox flow battery is a promising technology for large-scale low cost energy storage. The rich possibilities for the tailoring of organic molecules and the possibility to discover active materials of lower cost and decreased environmental impact continue to drive research and development of organic compounds suitable for redox flow battery applications. In this work, we focus on the characterization of aromatic molecules with 1,4-diaza groups for flow battery applications. We examine the influence of electron-withdrawing and electron-donating substituents and the effect of the relative position of the substituent(s) on the molecule. We found that electron-withdrawing substituents increased the potential, while electron-donating decreased it, in agreement with expectations. The number of carboxy-groups on the pyrazinic ring was found to have a strong impact on the heterogeneous electron transfer kinetics, with the slowest kinetics observed for pyrazine-2,3,5,6-tetracarboxylic acid. The stability of quinoxaline was investigated by cyclic voltammetry and in a flow cell configuration. Substitution at the 2,3-positions in quinoxaline was found to decrease the capacity fade rate significantly. Furthermore, we demonstrated how molecular aggregation reduces the effective number of electrons involved in the redox process for quinoxalines. This translates to a significant reduction of the achievable volumetric capacity at higher concentrations, yielding values significantly lower than the theoretical capacity. Finally, we demonstrate that such capacity-limiting molecular aggregation may be reduced by introducing flexible side chains with bulky charged groups in order to increase electrostatic repulsion and steric hindrance.

Electrochemical Sensors and Biosensors Based on Graphene Functionalized with Metal Oxide Nanostructures for Healthcare Applications

2019 ◽  
Vol 4 (18) ◽  
pp. 5322-5337 ◽  
Author(s):  
Sudesh Kumar ◽  
Shikandar D. Bukkitgar ◽  
Supriya Singh ◽  
Pratibha ◽  
Vanshika Singh ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Electrochemical Sensors ◽  
Healthcare Applications ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures

scholarly journals Metal oxide nanostructures: preparation, characterization and functional applications as chemical sensors

2017 ◽  
Vol 8 ◽  
pp. 1205-1217 ◽  
Author(s):  
Dario Zappa ◽  
Angela Bertuna ◽  
Elisabetta Comini ◽  
Navpreet Kaur ◽  
Nicola Poli ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Chemical Sensors ◽  
Contaminated Water ◽  
Oxide Nanowires ◽  
Metal Oxide Nanowires ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
P Type ◽  
Surface Morphologies

Preparation and characterization of different metal oxide (NiO, WO3, ZnO, SnO2 and Nb2O5) nanostructures for chemical sensing are presented. p-Type (NiO) and n-type (WO3, SnO2, ZnO and Nb2O5) metal oxide nanostructures were grown on alumina substrates using evaporation–condensation, thermal oxidation and hydrothermal techniques. Surface morphologies and crystal structures were investigated through scanning electron microscopy and Raman spectroscopy. Furthermore, different batches of sensors have been prepared, and their sensing performances towards carbon monoxide and nitrogen dioxide have been explored. Moreover, metal oxide nanowires have been integrated into an electronic nose and successfully applied to discriminate between drinking and contaminated water.

Sign in / Sign up

Export Citation Format

Share Document