Chemical Bath Deposition of ZnO Nanowires at Near-Neutral pH Conditions without Hexamethylenetetramine (HMTA): Understanding the Role of HMTA in ZnO Nanowire Growth

Langmuir ◽  
2011 ◽  
Vol 27 (7) ◽  
pp. 3672-3677 ◽  
Author(s):  
Kevin M. McPeak ◽  
Thinh P. Le ◽  
Nathan G. Britton ◽  
Zhorro S. Nickolov ◽  
Yossef A. Elabd ◽  
...  
Keyword(s):  
Chemical Bath Deposition ◽  
Zno Nanowires ◽  
Nanowire Growth ◽  
Zno Nanowire ◽  
Neutral Ph ◽  
Ph Conditions

Low Temperature Growth of ZnO Nanowires for Hybrid Chemical Sensors

2007 ◽  
Author(s):  
Ebonee A. Walker ◽  
Roberto Aga ◽  
Richard Mu
Keyword(s):  
Low Temperature ◽  
Electrical Transport ◽  
Zno Nanowires ◽  
Hybrid Nanocomposites ◽  
Growth Time ◽  
Nanowire Growth ◽  
Zno Nanowire ◽  
Electrical Transport Properties ◽  
Thermal Evaporation Method ◽  
Sensing Applications

Hybrid nanocomposites, such as ZnO nanowires embedded in conducting polymers, are very attractive for chemical sensing applications. Previous studies have shown that tuning ZnO nanowire concentration with respect to the polymer can be employed to tailor chemical sensitivity and selectivity. In this work, we investigate the effect of ZnO nanowire growth time on the electrical transport properties of sensors with and without the polymer matrix. Varying growth times may affect wire lengths, wire concentration, as well as wire interconnectivity. Using pure Zn as the source, ZnO nanowires are grown on a glass substrate by a low temperature thermal evaporation method. Poly(3-hexylthiophene) is employed as the polymeric matrix to form a hybrid structure. The response to ethanol vapor of sensors with different nanowire growth times is evaluated.

In SituX-ray Absorption Near-Edge Structure Spectroscopy of ZnO Nanowire Growth During Chemical Bath Deposition

2010 ◽  
Vol 22 (22) ◽  
pp. 6162-6170 ◽  
Author(s):  
Kevin M. McPeak ◽  
Matthew A. Becker ◽  
Nathan G. Britton ◽  
Hasti Majidi ◽  
Bruce A. Bunker ◽  
...  
Keyword(s):  
Chemical Bath Deposition ◽  
Nanowire Growth ◽  
Zno Nanowire ◽  
Edge Structure

Prebiotic studies on the interaction of zirconia nanoparticles and ribose nucleotides and their role in chemical evolution

2021 ◽  
Vol 20 (2) ◽  
pp. 142-149
Author(s):  
Avnish Kumar Arora ◽  
Pankaj Kumar
Keyword(s):  
Electron Microscopy ◽  
Metal Oxide ◽  
Metal Oxides ◽  
Chemical Evolution ◽  
Ribonucleic Acid ◽  
Zirconium Oxide ◽  
Origins Of Life ◽  
Neutral Ph ◽  
Interaction Studies

AbstractStudies on the interaction of biomolecules with inorganic compounds, mainly mineral surfaces, are of great concern in identifying their role in chemical evolution and origins of life. Metal oxides are the major constituents of earth and earth-like planets. Hence, studies on the interaction of biomolecules with these minerals are the point of concern for the study of the emergence of life on different planets. Zirconium oxide is one of the metal oxides present in earth's crust as it is a part of several types of rocks found in sandy areas such as beaches and riverbeds, e.g. pebbles of baddeleyite. Different metal oxides have been studied for their role in chemical evolution but no studies have been reported about the role of zirconium oxide in chemical evolution and origins of life. Therefore, studies were carried out on the interaction of ribonucleic acid constituents, 5′-CMP (cytidine monophosphate), 5′-UMP (uridine monophosphate), 5′-GMP (guanosine monophosphate) and 5′-AMP (adenosine monophosphate), with zirconium oxide. Synthesized zirconium oxide particles were characterized by using vibrating sample magnetometer, X-Ray Diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy. Zirconia particles were in the nanometre range, from 14 to 27 nm. The interaction of zirconium oxide with ribonucleic acid constituents was performed in the concentration range of 5 × 10−5–300 × 10−5 M. Interaction studies were carried out in three mediums; acidic (pH 4.0), neutral (pH 7.0) and basic (pH 9.0). At neutral pH, maximum interaction was observed. The interaction of zirconium oxide with 5′-UMP was 49.45% and with 5′-CMP 67.98%, while with others it was in between. Interaction studies were Langmurian in nature. Xm and KL values were calculated. Infrared spectral studies of ribonucleotides, metal oxide and ribonucleotide–metal oxide adducts were carried out to find out the interactive sites. It was observed that the nitrogen base and phosphate moiety of ribonucleotides interact with the positive charge surface of metal oxide. SEM was also carried out to study the adsorption. The results of the present study favour the important role of zirconium oxide in concentrating the organic molecules from their dilute aqueous solutions in primeval seas.

Influence of bend geometry on flow accelerated corrosion under neutral pH conditions

2021 ◽  
Vol 122 ◽  
pp. 105127
Author(s):  
P. Madasamy ◽  
M. Mukunthan ◽  
P. Chandramohan ◽  
T.V. Krishna Mohan ◽  
Andrews Sylvanus ◽  
...  
Keyword(s):  
Accelerated Corrosion ◽  
Neutral Ph ◽  
Ph Conditions ◽  
Flow Accelerated Corrosion

scholarly journals Role of Autochthonous Filamentous Fungi in Bioremediation of a Soil Historically Contaminated with Aromatic Hydrocarbons

2006 ◽  
Vol 72 (1) ◽  
pp. 28-36 ◽  
Author(s):  
A. D'Annibale ◽  
F. Rosetto ◽  
V. Leonardi ◽  
F. Federici ◽  
M. Petruccioli
Keyword(s):  
Aromatic Hydrocarbons ◽  
Contaminated Soil ◽  
Chloride Ions ◽  
Lepidium Sativum ◽  
Fungal Colonization ◽  
Soil Toxicity ◽  
Germination Test ◽  
Lignin Peroxidases ◽  
Ph Conditions

ABSTRACT Nine fungal strains isolated from an aged and heavily contaminated soil were identified and screened to assess their degradative potential. Among them, Allescheriella sp. strain DABAC 1, Stachybotrys sp. strain DABAC 3, and Phlebia sp. strain DABAC 9 were selected for remediation trials on the basis of Poly R-478 decolorization associated with lignin-modifying enzyme (LME) production. These autochthonous fungi were tested for the abilities to grow under nonsterile conditions and to degrade various aromatic hydrocarbons in the same contaminated soil. After 30 days, fungal colonization was clearly visible and was confirmed by ergosterol determination. In spite of subalkaline pH conditions and the presence of heavy metals, the autochthonous fungi produced laccase and Mn and lignin peroxidases. No LME activities were detected in control microcosms. All of the isolates led to a marked removal of naphthalene, dichloroaniline isomers, o-hydroxybiphenyl, and 1,1′-binaphthalene. Stachybotrys sp. strain DABAC 3 was the most effective isolate due to its ability to partially deplete the predominant contaminants 9,10-anthracenedione and 7H-benz[DE]anthracen-7-one. A release of chloride ions was observed in soil treated with either Allescheriella sp. strain DABAC 1 or Stachybotrys sp. strain DABAC 3, suggesting the occurrence of oxidative dehalogenation. The autochthonous fungi led to a significant decrease in soil toxicity, as assessed by both the Lepidium sativum L. germination test and the Collembola mortality test.

A Nickel(II) Complex as a Homogeneous Electrocatalyst for Water Oxidation at Neutral pH: Dual Role of HPO42−in Catalysis

ChemCatChem ◽  
2016 ◽  
Vol 8 (20) ◽  
pp. 3287-3293 ◽  
Author(s):  
Jia-Wei Wang ◽  
Xiang-Qiong Zhang ◽  
Hai-Hua Huang ◽  
Tong-Bu Lu
Keyword(s):  
Water Oxidation ◽  
Dual Role ◽  
Neutral Ph

Wastewater disinfection by neutral pH photo-Fenton: The role of solar radiation intensity

2016 ◽  
Vol 181 ◽  
pp. 1-6 ◽  
Author(s):  
E. Ortega-Gómez ◽  
M.M. Ballesteros Martín ◽  
B. Esteban García ◽  
J.A. Sánchez Pérez ◽  
P. Fernández Ibáñez
Keyword(s):  
Solar Radiation ◽  
Radiation Intensity ◽  
Neutral Ph ◽  
Solar Radiation Intensity ◽  
Wastewater Disinfection

Role of surrounding oxygen on oxide nanowire growth

2010 ◽  
Vol 97 (7) ◽  
pp. 073114 ◽  
Author(s):  
Annop Klamchuen ◽  
Takeshi Yanagida ◽  
Masaki Kanai ◽  
Kazuki Nagashima ◽  
Keisuke Oka ◽  
...  
Keyword(s):  
Nanowire Growth
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