Preparation and characterization of triple polymer-coated controlled-release urea with water-retention property and enhanced durability

2010 ◽  
Vol 120 (4) ◽  
pp. 2103-2111 ◽  
Author(s):  
Shuming Tao ◽  
Jun Liu ◽  
Kemo Jin ◽  
Xiaoyun Qiu ◽  
Yuan Zhang ◽  
...  
Keyword(s):  
Controlled Release ◽  
Water Retention ◽  
Controlled Release Urea

scholarly journals Synthesis and Characterization of Controlled-Release Urea Fertilizer from Superabsorbent Hydrogels

2020 ◽  
Vol 20 (3) ◽  
pp. 616
Author(s):  
Salih Muharam ◽  
Afria Fitri ◽  
Lela Mukmilah Yuningsih ◽  
Yulia Mariana Tessa Ayudia Putri ◽  
Isnaini Rahmawati
Keyword(s):  
Controlled Release ◽  
Ph Control ◽  
Superabsorbent Hydrogel ◽  
Urea Fertilizer ◽  
Urea Release ◽  
Controlled Release Urea ◽  
Carboxy Methyl ◽  
Controlled Release Fertilizers ◽  
Superabsorbent Hydrogels

It is very important to develop controlled-release fertilizers to ensure efficiency and environmental protection. This study aims to make a superabsorbent hydrogel-based controlled-release urea fertilizer. Superabsorbent hydrogels were prepared from the cellulose of corn cobs cross-linking with epichlorohydrin, and then an amount of urea as a fertilizer was stored inside the hydrogels (GEL-A). The GEL-A functionalization with carboxy-methyl was also carried out in this study to improve the hydrophilicity of hydrogels (GEL-B). GEL-A and GEL-B were immersed in water at a certain pH and temperature range and the urea concentration released from the hydrogels was monitored by a spectrophotometer. The results showed that the urea released by GEL-A and GEL-B was not much different. Respectively, the urea efficiency of GEL-A and GEL-Bwas around 5.29% and 5.56% for 180 min. The urea released from both hydrogels was not significantly affected by changes in the temperature of the solution. Urea release was influenced by pH, and the rate of urea release of GEL-B was faster than GEL-A, so pH control was needed in the application of this slow-release fertilizer.

Interaction of deep placed controlled-release urea and water retention agent on nitrogen and water use and maize yield

2016 ◽  
Vol 75 ◽  
pp. 118-129 ◽  
Author(s):  
Liwei Guo ◽  
Tangyuan Ning ◽  
Liangpeng Nie ◽  
Zengjia Li ◽  
Rattan Lal
Keyword(s):  
Controlled Release ◽  
Water Use ◽  
Water Retention ◽  
Maize Yield ◽  
Controlled Release Urea

Optimization of Pan Coating Process for Increased Efficiency of Controlled-Release Urea Fertilizer

2021 ◽  
Vol 57 (4) ◽  
pp. 333-342
Author(s):  
Trung Huu Nguyen ◽  
Tran Nguyen Minh An ◽  
Mahboob Alam ◽  
Duc Hoai Tran ◽  
Nghi Tran ◽  
...  
Keyword(s):  
Controlled Release ◽  
Layer Thickness ◽  
Release Time ◽  
Coating Process ◽  
Analysis Method ◽  
Sauter Mean Diameter ◽  
Urea Fertilizer ◽  
The Relationship ◽  
Central Composite ◽  
Controlled Release Urea

The goal of the research is to develop an experimental mathematical model of pan coating process effect on the biodegradable polymer and to determine optimal process parameters. The polymer solution was conducted with phosphated di-starch phosphate, polyvinyl alcohol, and polyacrylic acid and performed as material coating for the controlled-release urea fertilizer. The image analysis method has been used to determine the particle size distribution, Sauter mean diameter of the particle and layer thickness that is novel. The central composite rotatable design has been selected to determine the regression models of the process, which described the relationship between two objective variables as layer thickness, release time with angle of pan, spray flow, and coating time. The statistical analysis results indicate the fitness of model.

Hydrogel-clay Nanocomposites as Carriers for Controlled Release

2020 ◽  
Vol 27 (6) ◽  
pp. 919-954 ◽  
Author(s):  
Raluca Ianchis ◽  
Claudia Mihaela Ninciuleanu ◽  
Ioana Catalina Gifu ◽  
Elvira Alexandrescu ◽  
Cristina Lavinia Nistor ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Controlled Release ◽  
Hybrid Materials ◽  
Pharmaceutical Formulations ◽  
Tree Of Life ◽  
Present Review ◽  
Clay Nanocomposites ◽  
Delivery Platform ◽  
Complex Hybrid

The present review aims to summarize the research efforts undertaken in the last few years in the development and testing of hydrogel-clay nanocomposites proposed as carriers for controlled release of diverse drugs. Their advantages, disadvantages and different compositions of polymers/biopolymers with diverse types of clays, as well as their interactions are discussed. Illustrative examples of studies regarding hydrogel-clay nanocomposites are detailed in order to underline the progressive researches on hydrogel-clay-drug pharmaceutical formulations able to respond to a series of demands for the most diverse applications. Brief descriptions of the different techniques used for the characterization of the obtained complex hybrid materials such as: swelling, TGA, DSC, FTIR, XRD, mechanical, SEM, TEM and biology tests, are also included. Enlightened by the presented data, we can suppose that hydrogel-clay nanocomposites will still be a challenging subject of global assiduous researches. We can dare to dream to an efficient drug delivery platform for the treatment of multiple affection concomitantly, these being undoubtedly like ”a tree of life” bearing different kinds of fruits and leaves proper for human healing.

DEVELOPMENT AND CHARACTERIZATION OF CHITOSAN NANOPARTICLES LOADED NANOFIBER HYBRID SYSTEM FOR VAGINAL CONTROLLED RELEASE OF BENZYDAMINE

2021 ◽  
pp. 105801
Author(s):  
Fatmanur Tuğcu-Demiröz ◽  
Sinem Saar ◽  
Adnan Altuğ Kara ◽  
Ayşegül Yıldız ◽  
Emre Tunçel ◽  
...  
Keyword(s):  
Controlled Release ◽  
Hybrid System ◽  
Chitosan Nanoparticles
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