نتایج جستجو برای: uv visible spectrophotometry

تعداد نتایج: 146117  

2017
Qiong Zhou John Z. Wen Pei Zhao William A. Anderson

Vertically aligned zinc oxide (ZnO) nanowires were hydrothermally synthesized on a glass substrate with the assistance of a pre-coated ZnO seeding layer. The crystalline structure, morphology and transmission spectrum of the as-synthesized sample were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), and ultraviolet-visible (UV-Vis) spectrophotometr...

2018
Linhai Biao Shengnan Tan Qinghuan Meng Jing Gao Xuewei Zhang Zhiguo Liu Yujie Fu

Green synthesis of gold nanoparticles using plant extracts is one of the more promising approaches for obtaining environmentally friendly nanomaterials for biological applications and environmental remediation. In this study, proanthocyanidins-functionalized gold nanoparticles were synthesized via a hydrothermal method. The obtained gold nanoparticles were characterized by ultraviolet and visib...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علم و صنعت ایران - دانشکده شیمی 1387

پورفیرین ها ترکیبات ماکروسیکلی هستند که نور مرئی را از ناحیه 350 تا 700 nm می کنند. در این پایان نامه پنج پورفیرین (tpp)، تتراکیس (4-سولفوکسی فنیل) پورفیرین ((tpps، تتراکیس (4- کربوکسی فنیل) پورفیرین (tpyp) و تتراکیس (4-متیل پیریدین) پورفیرین ((tmpyp و یک متالوپوفیرین (cu(ii) tcpp) سنتز شدند و توسط طیف سنجی uv-visible و ft-tr شناسایی شدند. نانو ذرات tcpp و tpp سنتز و توسط طیف سنجی uv-visible شن...

Journal: :Coatings 2023

In the field of corrosion protection coatings, layered double hydroxide (LDH) has gained wide attention as a novel controlled-release nanocontainer. this paper, by using co-precipitation to store inhibitors in with barrier properties, an environmentally friendly gallic acid (GA) intercalated filler (GA-LDH) was prepared. The epoxy coating then modified GA-LDH improve its performance. structure,...

Journal: :Emergent materials 2021

Abstract Cystic echinococcosis is a public health problem in developing countries that practice sheep breeding extensively. In the current study, protoscolicidal activity of biosynthesized zinc oxide nanoparticles (ZnO NPs) derived from Mentha longifolia L. leaf extracts was investigated. The resultant ZnO NPs were characterized by means various analytical techniques, such as ultraviolet–visibl...

2016
Christian H. Mathis Mohammad Divandari Rok Simic Vikrant V. Naik Edmondo M. Benetti Lucio Isa Nicholas D. Spencer

Solvent interactions with bulk and surface-bound polymer brushes are crucial for functionalities such as controlled friction and thermoresponsive adhesion. To study such interactions, the temperature-induced solvent-quality changes and the effect of surface tethering on the mechanical and tribological properties of poly(dodecyl methacrylate) (P12MA) brushes have been investigated by means of at...

2015
Rodolfo Moresco Virgílio G. Uarrota Aline Pereira Maíra M. Tomazzoli Eduardo da C. Nunes Luiz Augusto Martins Peruch Christopher Costa Miguel Rocha Marcelo Maraschin

Manihot esculenta roots rich in β-carotene are an important staple food for populations with risk of vitamin A deficiency. Cassava genotypes with high provitamin A activity have been identified as a strategy to reduce the prevalence of deficiency of this vitamin, In this study, the metabolomics characterization focusing on the carotenoid composition of ten cassava genotypes cultivated in southe...

2012
Monica Butnariu Cristina Zepa Coradini

BACKGROUND This study aimed to quantify the active biological compounds in C. officinalis flowers. Based on the active principles and biological properties of marigolds flowers reported in the literature, we sought to obtain and characterize the molecular composition of extracts prepared using different solvents. The antioxidant capacities of extracts were assessed by using spectrophotometry to...

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