On the preparation and swelling properties of hydrogel nanocomposite based on Sodium alginate-g-Poly (acrylic acid-co-acrylamide)/Clinoptilolite and its application as slow release fertilizer

Rashidzadeh, Azam; Olad, Ali; Salari, Dariush; Reyhanitabar, Adel

doi:10.1007/s10965-013-0344-9

Cited by 161 publications

(81 citation statements)

References 58 publications

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“…The slow watering potential of composites was also demonstrated with soil-pot experiments, in which plants exhibited much better growth when nanoparticle-mixed soil was used ). Rashidzadeh et al (2014) have found that the presence of the clinoptilolite zeolite in the Sodium alginate-g-Poly (acrylic acid-co-acrylamide)/Clinoptilolite hydrogel caused the system to liberate the nutrient in a more controlled manner than that with the neat hydrogel. The prepared hydrogel nanocomposite formulation releases about 54.23 % of fertilizer in 30 days which is an indication of a good slow-release property.…”

Section: +3mentioning

confidence: 99%

“…Slow-released NPK fertilizer encapsulated by superabsorbent composite has been prepared via in situ free radical polymerization of sodium alginate, acrylic acid, acrylamide, and montmorillonite in the presence of fertilizer compounds by Rashidzadeh et al (2014). Results indicated that the presence of the montmorillonite caused the system to liberate the nutrient in a more controlled manner than that with the neat superabsorbent.…”

Section: +3mentioning

confidence: 99%

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Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

278

175

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Agrochemicals are used to improve the production of crops. Conventional formulations of agrochemicals can contaminate the environment, in particular in the case of intensive cropping. Hence, there is a need for controlledrelease formulations of agrochemicals such as polysaccharides to reduce pollution and health hazards. Natural polysaccharides are hydrophilic, biodegradable polymers. This article reviews the use of polysaccharides in the form of micro-and nanoparticles, beads and hydrogels. The main points are: (1) slow release formulations minimize environmental impact by reducing agrochemical leaching, volatilization and degradation. For example, 50 % of the encapsulated insecticide chlorpyrifos is released in 5 days, whereas free chlorpyrifos is released in 1 day. (2) Slow release formulations increase the water-holding capacity of soil. (3) Slow release formulations better control weeds in the long run. (4) Polymer-clay formulations store ionic plant nutrients. (5) Polymer hydrogel formulations reduce compaction, erosion, and water run-off. They increase soil permeability and aeration, infiltration rates, and microbial activity, and, in turn, plant performance. In conclusion, polysaccharide formulations can be used for safer use of agrochemicals.

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Section: +3mentioning

confidence: 99%

Section: +3mentioning

confidence: 99%

Polysaccharides as safer release systems for agrochemicals

Campos

Oliveira

Fraceto

et al. 2014

Agron. Sustain. Dev.

278

175

View full text Add to dashboard Cite

show abstract

“…This kind or polymers had been previously synthesized and characterized. 25,[35][36][37][38][39][40][41] Besides the FTIR spectra were done as a function of the crosslinking agent concentration (0.5, 1, 4 and 8 wt.% of GDA), keeping the relation acrylamide/ acrylic acid constant. The results show a decrease in the signal of 1572 cm -1 in contrast with 1677 cm -1…”

Section: Fourier-transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

THE USE OF POLYSACCHARIDES EXTRACTED FROM SEED OF Persea americana var. Hass ON THE SYNTHESIS OF ACRYLIC HYDROGELS

Lara-Valencia¹,

Dávila-Soto²,

Moscoso-Sánchez³

et al. 2017

Quim. Nova

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This paper reports the use of polysaccharides extracted from seed of Persea americana var. Hass in the synthesis of acrylic hydrogels. The effects of the chemical composition (acrylamide/acrylic acid), the concentration of crosslinking agent (glycerol diacrylate) and the type of initiation (redox, photoinitiation) of the hydrogels were evaluated with and without polysaccharides. Xerogels were characterized by FTIR spectroscopy, differential scanning calorimetry (DSC) and scanning electron microscopy (SEM), while for the swollen hydrogels the swelling kinetic and mechanical properties were evaluated. The kinetic parameters were obtained using the second order equation proposed by Schott, where it is reported that by increasing the concentration of the crosslinking agent, the degree of swelling is reduced because of the greater structural level. The increase of the amount of acrylamide and the amount of polysaccharides causes also a decrease in the swelling degree. The type of initiation also affected the hydrogels swelling kinetic, the photoinitiated hydrogels were the ones that captured less water. Moreover, the increasing of the glass transition temperature and the compression modulus with the crosslinking agent concentration and molar ratio AAm/AAc are observed for hydrogels with and without polysaccharides. The results demonstrate a successful incorporation of polysaccharides into the polymeric network.

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“…Ao analisar os dados da Tabela 3, observou-se que em algumas condições experimentais o grau de intumescimento do grânulos de hidrogéis com 5% de zeólita foi menor do que os valores do grau de intumescimento dos grânulos de hidrogéis puros (hidrogéis de alginato de cálcio) que estão apresentados na Tabela 1. Neste caso, mesmo a zeólita sendo um material hidrofílico, possivelmente esta deve estar atuando como um reticulador físico na matriz do hidrogel, na qual os grupos óxidos polares estabelecem interações físicas e/ou ligações de hidrogênio com os grupos carboxílicos ou hidroxílas, diminuindo assim a capacidade de expansão do hidrogel 26 e refletindo em menor capacidade de absorção de água.…”

Section: Influência Da Incorporação De Nanocargas Na Matriz Poliméricunclassified

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

Fernandes¹,

Moura²,

Aouada³

2016

Quim. Nova

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. In this study, the hydrogel formulations based on polysaccharide sodium alginate were investigated for further development of intercalated nanocomposite hydrogels, for purposes of future applications in the areas of health as a carrier in drug delivery systems. Thus, the objective of the work dealt with in the optimization of hydrogels synthesis and obtaining nanostructured hydrogels with clay in an intercalated conformation. The optimization of the hydrogel synthesis was successful, and it is possible to define the materials and / or solutions to be used and concentrations of these solutions to the best formulations of hydrogels. The choice of the concentration of the polysaccharide, the type of crosslinking agent and nanofiller to continued development work, it was determined following criteria as the degree of swelling, and in some cases the physical properties, contributed to determine the best hydrogels. The development of intercalated nanocomposites hydrogel beads was confirmed by the X-ray diffraction technique, which thus could be used to observe evidence of effective incorporation or intercalation of the nanoclay in the hydrogel matrix.Keywords: hydrogels; nanocomposites; sodium alginate; nanofillers; intercalation. INTRODUÇÃOTendo em vista a necessidade de equipamentos sofisticados na área biomédica, os que são disponibilizados para utilização apresentam alto custo, sendo este um impasse no que diz respeito à aquisição. Deste modo, os biomateriais surgem como uma opção interessante, já que desde a última década vem se estudando e trabalhando com este tipo de material, principalmente na área médica. Existem diferentes maneiras de se definir o termo biomateriais. Dentre essas, os biomateriais são definidos como materiais utilizados na substituição de algum órgão vital que perdeu sua atividade no organismo. Atualmente o campo de aplicação engloba desde as próteses até a utilização para regeneração óssea. 1 Dentro da classe dos biomateriais, existem os polímeros, que são macromoléculas que se permitem serem moldadas de acordo com a área a ser empregada. 2 A utilização de polímeros está em ascendência, e se mostra altamente proveitoso na biomedicina principalmente quando se trata de polímeros naturais. A motivação está fundamentada nas propriedades como biodegradabilidade e biocompatibilidade. Dessa maneira, o alginato de sódio (sendo um polímero natural), em razão das propriedades já mencionadas e pelo fato de ser atóxico, termoestável e de baixo custo, vem recebendo grande atenção para tal finalidade. 3 O alginato de sódio é um polissacarídeo obtido por meio da extração de algas marrons (Phaeophyceae). As cadeias macromoleculares são lineares com segmento rígidos e flexíveis. 4 O segmento rígido é atribuído aos blocos G formado pelo monossacarídeo ácido α-L-gulurônico e o segmento flexível está associado aos blocos M que são constituídos de unidades monossacarídicas de ácido β-D-manurônico. 4 O alginato de sódio pode apresentar cadeias com apenas blocos M ou apenas blocos G, ou pode ser constituída por ...

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On the preparation and swelling properties of hydrogel nanocomposite based on Sodium alginate-g-Poly (acrylic acid-co-acrylamide)/Clinoptilolite and its application as slow release fertilizer

Cited by 161 publications

References 58 publications

Polysaccharides as safer release systems for agrochemicals

Polysaccharides as safer release systems for agrochemicals

THE USE OF POLYSACCHARIDES EXTRACTED FROM SEED OF Persea americana var. Hass ON THE SYNTHESIS OF ACRYLIC HYDROGELS

Otimização da síntese de hidrogéis nanocompósitos intercalados para possível aplicação na área médica

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