نتایج جستجو برای: polymer urea

تعداد نتایج: 130317  

Journal: :Analytical and Bioanalytical Chemistry 2021

Perovskite materials have attracted attention due to their excellent optical and electrical properties; however, unsatisfactory stability limits application in biochemical detection. In this paper, CsPbBr3 perovskite quantum dots were successfully encapsulated poly(styrene/acrylamide) microspheres, using a swelling–shrinking method. The manufactured microspheres (PDPS composites) not only maint...

Journal: :Soil Use and Management 2023

The use of urea as nitrogen (N) fertilizer in agriculture needs to consider environmental, economic and resource conservation aspects because low N-use efficiency (NUE). Polymer-coated (PCU) offers an effective way improve the NUE reduce its environmental trade-offs. However, we lack information on impact climate soil properties N release from PCU. Therefore, this study was performed quantify e...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه علوم کشاورزی و منابع طبیعی گرگان - دانشکده علوم کشاورزی 1392

تاثیر لیپاز و پروتئاز استارتری در تسریع رسیدن و توسعه عطر و طعم پنیر فتای فراپالایش بررسی شد. آنزیم های حاصل از تجزیه سلولی لاکتوباسیلوس پلانتاروم به وسیله التراسوند در 2 غلظت 5/2 میلی لیتر در لیتر و 5 میلی لیتر در لیتر و لیپاز ریزوموکورمهی در 2 غلظت12/0 گرم در لیتر و 24/0 گرم در لیتر به رتنتیت افزوده شدند. خصوصیات فیزیکوشیمیایی نمونه ها در روزهای 15، 30، 45 و 60 آنالیز شـد. بررسـی فرایند پروتئ...

Journal: :IUCrData 2023

The title compound, [Cu 2 (C 5 H 6 O 4 ) 11 10 N O)] n , contains square-pyramidally coordinated Cu II ions linked by anti-gauche conformation glutarate (glu) ligands into ] di-periodic coordination polymer layers with embedded (OCO) paddlewheel clusters. In turn, the layer motifs are connected 1,3-di(pyridin-3-yl)urea (3-dpu) linkers to form a (3-dpu)] tri-periodic network. Treating clusters a...

Journal: :Electrochemistry Communications 2021

Binary and ternary deep eutectic solvent (DES) mixtures based on choline chloride, with ethylene glycol, oxalic acid, urea fructose, were used for the first time as media electropolymerisation of poly(methylene blue) (PMB) glassy carbon electrodes (GCEs) GCEs modified multiwalled nanotubes (MWCNTs). The influence different parameters such DES composition, presence MWCNTs and/or perchlorate dopa...

2016
Rok Zaplotnik Alenka Vesel Gregor Primc Xiangyu Liu Kevin C. Chen Chiju Wei Kaitian Xu Miran Mozetic Esmaiel Jabbari

Polyurethane/urea copolymers based on poly(ethylene glycol) (PURPEG) were exposed to weakly ionized, highly reactive low-pressure oxygen plasma to improve their sorption kinetics. The plasma was sustained with an inductively coupled radiofrequency generator operating at various power levels in either E-mode (up to the forward power of 300 W) or H-mode (above 500 W). The treatments that used H-m...

2018
Wenjun Yuan Yazhen Shen Fei Ma Changwen Du

Polyacrylate polymer (PA) was modified with graphene oxide (GO) and the obtained composites were applied as coatings for controlled-release coated urea (CRU). The physicochemical properties of the different PA/GO coatings were characterized in detail and the nitrogen-release characteristics of the obtained CRU samples were determined in water at 25 ◦C. The experimental results revealed that add...

2017
Jiebing Li Miao Wang Diao She Yadong Zhao

Urea coating has been conducted using polylactic acid (PLA) blended with an industrial softwood kraft lignin. The latter was pre-functionalized via esterification or Mannich reaction. The coated urea becomes therefore a highly effective nitrogen fertilizer due to the controlled release after the coating, the slow release from the organically bound nitrogen structure formed after the Mannich rea...

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