Chitosan Matrix Encapsulation of α‐Lipoic Acid (LA) Anchored Gold Nanoparticles: A Combined Experimental and Theoretical Study

2021 ◽  
Vol 6 (38) ◽  
pp. 10379-10385
Author(s):  
Ravi Gunupuru ◽  
Amritansh Mehrotra ◽  
Pinisetti Swami Sairam ◽  
Gaurav Vyas ◽  
Jitendra K Pandey ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Lipoic Acid ◽  
Theoretical Study ◽  
Chitosan Matrix

A metal-enhanced fluorescence study of primary amines: determination of aminoglycosides with europium and gold nanoparticles

2015 ◽  
Vol 7 (4) ◽  
pp. 1407-1414 ◽  
Author(s):  
Mehmet Gokhan Caglayan ◽  
Feyyaz Onur
Keyword(s):  
Gold Nanoparticles ◽  
Lipoic Acid ◽  
Primary Amines ◽  
Fluorimetric Detection ◽  
Enhanced Fluorescence ◽  
Fluorescence Study ◽  
Metal Enhanced Fluorescence

This paper describes a lipoic acid capped europium nanoparticle-based assay for the fluorimetric detection of primary amines.

scholarly journals PREPARATION OF CHITOSAN-GOLD NANOPARTICLES: PART 2. THE ROLE OF CHITOSAN

2010 ◽  
Vol 8 (3) ◽  
pp. 320-326 ◽  
Author(s):  
Adlim Adlim ◽  
Mohamad Abu Bakar
Keyword(s):  
Gold Nanoparticles ◽  
Acetic Acid ◽  
Colloidal Particles ◽  
Acetic Acid Solution ◽  
Molar Ratio ◽  
Plasmon Band ◽  
Gold Particles ◽  
Chitosan Matrix ◽  
Metal Colloid

Colloidal gold nanoparticles prepared by employing chitosan as the stabilizer in solvent of methanol-acetic acid solution were stable for months without precipitation. The mole ratio of chitosan-gold ions of 5:1 - 30:1 gave dispersed and fine gold particles in range of 9.4-10.4 nm. Gold reduction in chitosan matrix was faster at higher chitosan concentration, and molar ratio of chi : Au, from 5:1 to 40:1. Higher acidity of acetic acid (pH 2-6) led to faster reduction of gold ions. The intensity of gold metal colloid plasmon band increased at higher concentration of acetic acid. Chitosan functioned both as a stabilizer and a reducing agent for gold ions. Gold colloidal particles immobilized on chitosan coated TiO2 as the solid support gave more dispersed and smaller particles (4.6 nm) compared with gold particles supported on TiO2 without chitosan coating.   Keywords: gold nanoparticles, chitosan, chitosan coated TiO2

Electronic transport in organic memories of chitosan with gold nanoparticles

2014 ◽  
Vol 34 (2) ◽  
pp. 105-111 ◽  
Author(s):  
Germán Ayala Valencia ◽  
Jaiber Humberto Rodríguez Llanos ◽  
Luci Cristina de Oliveira Vercik ◽  
Andrés Vercik
Keyword(s):  
Gold Nanoparticles ◽  
Electronic Transport ◽  
Electronic Conductivity ◽  
Bistable Behavior ◽  
Trap Charge ◽  
Chitosan Matrix ◽  
Limited Current ◽  
Current Voltage ◽  
Organic Memories ◽  
Scaling Rule

Abstract The effect of gold nanoparticles (AuNPs) on the electronic transport in chitosan and chitosan/AuNPs films was experimentally and theoretically studied. The electronic properties (current-voltage curves) relative to the transport in the organic bulk in films were fitted to various models: space-charge limited current (SCLC), trap-charge limited current (TCLC) and scaling rule. However, it was found that the TCLC model, ITCLC(V)αVl+1 and scaling rule, I(V)α(V-VT)ξ, describes better the electronic transport in chitosan and chitosan/AuNPs films. Current-voltage (I-V) curves showed an increasing conductivity with the AuNPs concentration. In addition, a bistable behavior was observed in chitosan/AuNPs films and it was attributed to the electron capture in the AuNPs. The results reported in this paper indicate that the electronic conductivity and bistable behavior in chitosan/AuNPs films could be controlled by the AuNPs incorporation on the chitosan matrix.

Theoretical Study of Alkanedithiolated Gold Clusters

2012 ◽  
Vol 1371 ◽  
Author(s):  
J. M. Cabrera-Trujillo ◽  
R. Jiménez-Cataño
Keyword(s):  
Molecular Dynamics ◽  
Gold Nanoparticles ◽  
Molecular Dynamics Simulation ◽  
Room Temperature ◽  
Theoretical Study ◽  
Gold Cluster ◽  
Gold Clusters ◽  
Dynamics Simulation ◽  
Temperature Structure ◽  
Reactive Molecular Dynamics

ABSTRACTA reactive molecular dynamics simulation study on the structure, energetics, and chemistry of alkanethiolated gold cluster is presented. Through very recent reactive molecular dynamics force-fields developed by Järvi et al. [1], chemical reactions of alkanedithiolates and star-like shape gold nanoparticles are studied throughout octanedithiolates and stellated cuboctahedral gold clusters models [2] at room temperature. Structure, energetics, reactants, and some products of the reactions are preliminarily analyzed up to 25 ps. In general, preliminary results of this work are in agreement with those reported in the review by Love et al. [3].

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