Effect of ultrasonic treatment before and after hydrothermal process on the morphologies and formation mechanism of ZnO nanorods

The organization of nanostructures across extended length scales is a key challenge in the design of integrated materials with advanced functions. PbZr0.52Ti0.48O3multilayer disks which were constructed by oriented rectangle nanoparticles were easily prepared by a simple surfactant-free hydrothermal process. The as-prepared powders were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The results indicated that the as-prepared PZT disks were constructed by self-assembly of rectangle nanoparticles by a perfect manner. The formation mechanism of the products was discussed.

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Development of Antibacterial Polyester Fabric by Growth of ZnO Nanorods

Journal of Engineered Fibers and Fabrics ◽

10.1177/155892501400900103 ◽

2014 ◽

Vol 9 (1) ◽

pp. 155892501400900 ◽

Cited By ~ 3

Author(s):

Munir Ashraf ◽

Frédéric Dumont ◽

Christine Campagne ◽

Philippe Champagne ◽

Anne Perwuelz ◽

...

Keyword(s):

Antibacterial Activity ◽

Zno Nanorods ◽

Hydrothermal Process ◽

Polyester Fabric ◽

Gram Negative Bacteria ◽

Air Plasma ◽

Gram Positive ◽

Gram Negative ◽

Polar Groups ◽

Staphyloccocus Aureus

ZnO nanorods were grown on polyester fabric by hydrothermal process. The seeding of fabric to grow ZnO nanorods was necessary because they did not grow without seeding. An air plasma treatment was carried out on polyester fabric to generate polar groups which could attach ZnO seeds. ZnO nanorods were grown on these seeds. The generation of polar groups was confirmed by XPS analysis. The morphology of nanorods was characterized with SEM and TEM. The quantity of ZnO deposited on fabric in the form of nanorods was estimated to be 5.6 % w/w by atomic absorption spectroscopy. Two Gram negative bacteria; Escherichia coli and Pseudomonas aeruginosa and a Gram positive; Staphyloccocus aureus were used for antibacterial activity evaluation by qualitative method. E. coli and S. aureus were used for quantitative assessment by using NF ISO 20743:2009 Transfer Method. It was noted that the functionalized fabric prevented the growth of bacteria not only on and below the fabric but also in the immediate proximities for all three bacteria. It was also observed that the fabric was more effective against Gram positive as compared to Gram negative bacteria. Moreover, it was shown that UV pre-activation of functionalized fabric enhanced the antibacterial activity.

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Surface Defects Control for ZnO Nanorods Synthesized Through a Gas-Assisted Hydrothermal Process

Journal of Electronic Materials ◽

10.1007/s11664-016-4869-7 ◽

2016 ◽

Vol 46 (1) ◽

pp. 432-438 ◽

Cited By ~ 4

Author(s):

Limin Zhao ◽

Changhua Shu ◽

Zhengfeng Jia ◽

Changzheng Wang

Keyword(s):

Surface Defects ◽

Zno Nanorods ◽

Hydrothermal Process

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Synthesis of Lipase-Immobilized CeO2 Nanorods as Heterogeneous Nano-Biocatalyst for Optimized Biodiesel Production from Eruca sativa Seed Oil

Catalysts ◽

10.3390/catal10020231 ◽

2020 ◽

Vol 10 (2) ◽

pp. 231 ◽

Cited By ~ 1

Author(s):

Anam Fatima ◽

Muhammad Waseem Mumtaz ◽

Hamid Mukhtar ◽

Sadia Akram ◽

Tooba Touqeer ◽

...

Keyword(s):

Ftir Spectroscopy ◽

Alternative Energy ◽

Immobilized Lipase ◽

Hydrothermal Process ◽

Biodiesel Production ◽

Attractive Alternative ◽

Eruca Sativa ◽

Alternative Energy Sources ◽

Biodiesel Synthesis ◽

Before And After

Biodiesel has emerged as one of the most attractive alternative energy sources to meet the growing needs of energy. Many approaches have been adopted for biodiesel synthesis. In the present work, biodiesel was produced from non-edible Eruca sativa oil using nano-biocatalyst-catalysed transesterification. Nano-biocatalyst (CeO2@PDA@A. terreus Lipase) was developed via the immobilization of lipase on polydopamine coated ceria nanorods, and CeO2 nanorods were developed via a hydrothermal process. The mean diameter of nanorods were measured to be 50–60 nm, while their mean length was 150–200 nm. Lipase activity before and after immobilization was measured to be 18.32 and 16.90 U/mg/min, respectively. The immobilized lipase depicted high stability at high temperature and pH. CeO2@PDA@A. terreus Lipase-catalysed transesterification resulted in 89.3% yield of the product. Process optimization through response surface methodology was also executed, and it was depicted that the optimum/maximum E. sativa oil-based biodiesel yield was procured at conditions of 10% CeO2@PDA@A. terreus Lipase, 6:1 methanol/oil ratio, 0.6% water content, 35 °C reaction temperature, and 30 h reaction time. The fuel compatibility of synthesized biodiesel was confirmed via the estimation of fuel properties that were in agreement with the ASTM D standard. The nanorods and dopamine-modified nanorods were characterized by FTIR spectroscopy, SEM, and energy dispersive X-ray (EDX), while conversion of E. sativa oil to biodiesel was confirmed by GC/MS and FTIR spectroscopy. Conclusively, it was revealed that CeO2@PDA@A. terreus Lipase has potential to be employed as an emphatic nano-biocatalyst.

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Decoration of Zinc Oxide Nanorods into the Surface of Activated Carbon Obtained from Agricultural Waste for Effective Removal of Methylene Blue Dye

Materials ◽

10.3390/ma13245667 ◽

2020 ◽

Vol 13 (24) ◽

pp. 5667

Author(s):

Priyanka Shrestha ◽

Manoj Kumar Jha ◽

Jeevan Ghimire ◽

Agni Raj Koirala ◽

Rajeshwar Man Shrestha ◽

...

Keyword(s):

Methylene Blue ◽

Zinc Oxide ◽

Activated Carbon ◽

Agricultural Waste ◽

Chemical Activation ◽

Zno Nanorods ◽

Waste Product ◽

Hydrothermal Process ◽

Photocatalytic Property ◽

Zinc Oxide Nanorods

Zinc oxide (ZnO) nanorods incorporated activated carbon (AC) composite photocatalyst was synthesized using a hydrothermal process. The AC was prepared from lapsi (Choerospondias axillaris) seed stone, an agricultural waste product, found in Nepal by the chemical activation method. An aqueous suspension of AC with ZnO precursor was subjected to the hydrothermal treatment at 140 °C for 2 h to decorate ZnO rods into the surface of AC. As-obtained ZnO nanorods decorated activated carbon (ZnO/AC) photocatalyst was characterized by various techniques, such as scanning electron microscopy (SEM), X-ray diffraction (XRD), and photoluminescence (PL) spectroscopy. Results showed that highly crystalline hexagonal ZnO nanorods were effectively grown on the surface of porous AC. The photocatalytic property of the as-prepared ZnO/AC composite was studied by degrading methylene blue (MB) dye under UV-light irradiation. The ZnO/AC composite showed better photocatalytic property than that of the pristine ZnO nanorods. The enhanced photocatalytic performance in the case of the ZnO/AC composite is attributed to the combined effects of ZnO nanorods and AC.

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Polymer-Assisted Hydrothermal Synthesis of PbTiO3 Crystals

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.528.176 ◽

2012 ◽

Vol 528 ◽

pp. 176-179

Author(s):

Yong Gang Wang ◽

Lin Lin Yang ◽

Xin Wang ◽

Song Li ◽

Yu Jiang Wang ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Hydrothermal Synthesis ◽

Formation Mechanism ◽

Powder Diffraction ◽

Self Assembly ◽

Hydrothermal Process ◽

X Ray ◽

Assembly Structure ◽

Scanning Electron

Using polymer as a surfactant, we successfully synthesized of PbTiO3 crystals with a self-assembly structure by a hydrothermal process. The as-obtained powders were characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The results show that the presence of PVP, PEG and PVA plays a key role on the formation of self-assembly structure and the corresponding formation mechanism was briefly discussed.

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Incorporation of Sb in ZnO Nanostructures Through Hydrothermal Process

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2008.18424 ◽

2008 ◽

Vol 8 (12) ◽

pp. 6551-6557 ◽

Cited By ~ 4

Author(s):

A. Escobedo Morales ◽

U. Pal ◽

M. Herrera Zaldivar

Keyword(s):

Optical Band Gap ◽

Catalytic Effect ◽

Low Cost ◽

Zno Nanorods ◽

Hydrothermal Process ◽

Semiconductor Nanostructures ◽

Zno Nanostructures ◽

High Concentration ◽

Heavy Doping ◽

Chemical Techniques

Incorporation of dopants in optoelectronic semiconductor nanostructures has been a matter of great interest in recent times. While such doping has been performed almost routinely using physical methods, use of low-cost chemical techniques for that purpose is still rare. We incorporated antimony in zinc oxide (ZnO) nanostructures through a low temperature hydrothermal method. In as-grown nanostructures, antimony remains partially in Sb2O3 phase. On thermal annealing at 500 °C, it dissociates and antimony incorporates into ZnO mainly by substituting zinc from the crystal lattice. Incorporation of Sb drastically modifies the morphology of the ZnO nanostructures. While incorporation of Sb in low concentration promotes the formation of uniform prismatic ZnO nanorods probably due to catalytic effect, high concentration of Sb causes the formation of rounded shaped nanoparticles due to high interfacial compressive stress. Incorporated Sb in the ZnO nanostructures remains inhomogeneously distributed. The optical band gap of the ZnO nanostructures increases a bit for lightly doped samples but it decreases for heavy doping.

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Comparative characteristics of microflora root dentine at the use of different variants of medicamentous treatment of root canals

Journal of New Medical Technologies eJournal ◽

10.12737/4791 ◽

2014 ◽

Vol 8 (1) ◽

pp. 1-4

Author(s):

Беленова ◽

I. Belenova ◽

Красичкова ◽

Olga Krasichkova

Keyword(s):

Sodium Hypochlorite ◽

Ultrasonic Treatment ◽

Root Canal ◽

Economic Effect ◽

Scientific Data ◽

Tooth Pulp ◽

Root Canals ◽

Antiseptic Treatment ◽

Before And After ◽

Abutment Teeth

Application of ultrasonic treatment combined with conventional methods of endodontic treatment contributes to reduce the cases of relapses and the time of treatment, and causes the highest economic effect. The proposed method allows to successfully treating chronic granulating periodontitis and to save the need for prosthetics abutment teeth. The purpose of this study is to increase the effectiveness of treatment of granulating periodontitis by optimizing antiseptic treatment of root canals by means of ultrasound. In a series of studies the material of the examination and treatment of patients in the therapeutic department «Lipetsk municipal dental polyclinic №2» was examined. The basis for receiving scientific data – contingent of 127 patients from 26 to 51 years with granulating form of chronic periodontitis, of these were 83 women and 44 men. Depending on the tactics of the treatment the patients were divided into two groups: the 1st group – 43 patients who were treated by the traditional method of treatment of periodontitis; the 2nd group – 84 persons were treated by means of ultrasound. Clinical examination of patients included visual diagnostics, sensing, thermometry, percussion, determination of conductivity of the tooth pulp, radiovisiographic and x-ray study. It is established, that after use of a 3% solution of sodium hypochlorite the changes are observed not qualitative composition of the microflora, but quantitative. The methods of ultrasonic treatment of chronic granulating periodontitis are developed. The ultrasound effect on the microflora of each root channel is conducted during 30 seconds with the frequency of 30 kHz. The structure of the dentin of the root canal with the help of scanning electronic microscopy, before and after the influence of ultrasound is studied and described. After exposure to 3% of sodium hypochlorite, activated by ultrasound, on the wall of the root canal by granulating periodontitis the growth of microorganisms didn’t revealed in 94,8% of cases.

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Characteristic of Al-Doped ZnO Nanorods by a Hydrothermal Process

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.434-435.646 ◽

2010 ◽

Vol 434-435 ◽

pp. 646-648 ◽

Cited By ~ 1

Author(s):

Jenn Kai Tsai ◽

Ju Yu Wei ◽

Yi Chi Chen ◽

You Cheng Jheng ◽

Teen Hang Meen

Keyword(s):

Electron Microscopy ◽

Zno Nanorods ◽

Hydrothermal Process ◽

Zinc Nitrate ◽

Diffraction Field ◽

Si Substrate ◽

X Ray ◽

Transmission Electron ◽

Dilute Aqueous Solution ◽

Doped Zno

In this study, well-aligned single-crystalline zinc oxide (ZnO) nanorods arrays were synthesized on Si substrate by simple hydrothermal process in dilute aqueous solution which consisting of zinc nitrate tetrahydrate (Zn(NO3)2•4H2O) and hexamethyltetramine (C6H12N4, HMT) at 90 °C, in the autoclave. ZnO thin film was pre-deposited on Si substrate by the sputter deposition to serve as the seed layer. Aluminum nitrite (Al(NO3)3) also has been mixed into reaction solution. Al doped ZnO nanorod arrays were fabricated successfully. ZnO nanorods were characterized by high resolution X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, energy dispersive x-ray spectroscopy, and photoluminescence measurement.

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