Intercalation and functionalization of zinc hydroxide nitrate with mono- and dicarboxylic acids

Arízaga, Gregório Guadalupe Carbajal; Gardolinski, José Eduardo Ferreira da Costa

doi:10.1016/j.jcis.2004.08.125

Cited by 71 publications

(47 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Between 131 and 552 °C a mass loss of 27% occurs, attributed to the matrix dehydroxylation along with nitrate decomposition. 26 The mass losses are consistent with the formula Zn 5 (OH) 8 (NO 3 ) 2 ·1.74H 2 O, close to the theoretical formula.TGA/DTA measurements were performed to estimate the composition of the intercalation compounds ( Figure 5). …”

supporting

confidence: 83%

Effect of confinement of anionic organic ultraviolet ray absorbers into two-dimensional zinc hydroxide nitrate galleries

Cursino¹,

Mangrich²,

Gardolinski³

et al. 2011

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

Espécies aniônicas absorvedoras de radiação ultravioleta (UV) (4-metoxibenzoato, N-acetilantranilato, 4-metoxicinamato e 4,4'-diamino-2,2'-estilbenodissulfonato) foram intercaladas em hidroxinitrato de zinco pelo método de co-precipitação ou reação de troca aniônica topotática. A intercalação foi confirmada por difratometria de raios X de pó (XRPD), espectroscopia na região do infravermelho com transformada de Fourier (FTIR), análise térmica (TGA/DTA), microscopia eletrônica de varredura (SEM), difração de elétrons em área selecionada (SAED), análise elementar e espectroscopia eletrônica na região do ultravioleta-visível (UV-Vis). Na reação de co-precipitação uma intercalação completa foi observada, enquanto na reação de troca aniônica os íons nitrato só foram parcialmente substituídos pelos ânions orgânicos. Após a intercalação, a capacidade de absorção de radiação UV foi similar à dos sais e ácidos sólidos, sendo o efeito atribuído ao confinamento das espécies aniônicas na galeria bidimensional da matriz hospedeira. Essa observação abre novas oportunidades para o uso de matrizes lamelares alternativas para a imobilização de ânions, na formulação de protetores solares.Anionic ultraviolet (UV) ray absorbers (4-methoxybenzoate, N-acetylanthranilate, 4-methoxycinnamate and 4,4'-diamino-2,2'-stilbenedisulfonate) were intercalated into zinc hydroxide nitrate, either by direct alkaline co-precipitation or topotactic exchange reactions. The intercalation was confirmed by X-ray powder diffractometry (XRPD), Fourier transform infrared spectroscopy (FTIR), thermal analysis (TGA/DTA), scanning electron microscopy (SEM), selected area electron diffraction (SAED), elemental analysis and ultraviolet visible (UV-Vis) spectroscopy. In the co-precipitation reactions full intercalation was achieved, while during the exchange reactions nitrate anions were not completely replaced by the organic anions. After the intercalation, the UV absorption capacity was similar to that of the solid salts and acids, the effect being attributed to the confinement of the anionic species in the host two-dimensional gallery. This observation opens new opportunities for the use of organic anions immobilized in alternative layered matrixes for the formulation of sunscreens.Keywords: zinc hydroxide nitrate, UV ray absorbers, sunscreens, layered materials, intercalation IntroductionHealth problems related to the exposure to solar ultraviolet (UV) radiation can be minimized by the use of sunscreens and other cosmetic filters. These products are regularly used by millions around the globe. Because of their frequent and long-term use, special attention has been devoted to the efficiency and safety of these formulations. 1UV ray absorbing organic molecules are widely employed as active ingredients of sunscreens. Among such substances are anthranilates and cinnamates.2 Although there are a large number of anthranilates (also known as ortho-aminobenzoates), only two of them are commonly found in commercial products: homomethyl-N-acetylEffect of Confinement o...

show abstract

supporting

confidence: 83%

Effect of confinement of anionic organic ultraviolet ray absorbers into two-dimensional zinc hydroxide nitrate galleries

Cursino¹,

Mangrich²,

Gardolinski³

et al. 2011

J. Braz. Chem. Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

“…FTIR spectra of samples F1-F4 are compared in Figure 3. Predictably, the characteristic band of wurtzite ZnO [2,[14][15][16] in the range of 400-500 cm -1 is strongest in the case of single phase ZnO (sample F3) and weakest in the case of Zn 5 (OH) 6 (CO 3 ) 2 (sample F1). Other marked absorption bands in sample F3 correspond to O-H bending and stretching 17,18 .…”

Section: Nh H O Nh Ohmentioning

confidence: 97%

Effects of precursor concentration and reaction time on sonochemically synthesized ZnO nanoparticles

et al. 2013

View full text Add to dashboard Cite

The sonochemical reaction between Zn(NO 3 ) 2 and hexamethylenetetramine (HMT) resulted in different products depending on amounts of Zn(II) cations in the aqueous solution. Crystalline phase pure ZnO nanoparticles were obtained by using 0.05 M Zn(NO 3 ) 2 -HMT. This single phase was formed by low power sonication for 20 min in an ultrasonic bath at ambient conditions and its morphology did not change for the next 60 min. Higher concentrations of precursors (0.1 and 0.5 M) led to a mixture of zinc compounds including plate-like Zn 5 (OH) 8 (NO 3 ) 2 (H 2 O). In contrast, a mixed phase ZnO/Zn 5 (OH) 6 (CO 3 ) 2 and a single phase Zn 5 (OH) 6 (CO 3 ) 2 were formed when the precursor concentrations were decreased to 0.01 and 0.005 M, respectively. The resulting infrared absorption and ultraviolet/visible emission were dependent on the phases and defects in these zinc compounds.

show abstract

“…[6] Different methods are there for the synthesis of layered zinc hydroxide; hydrolysis of salts and oxides, [7] urea hydrolysis, [8] precipitation with alkaline solutions, [9,10] solid state reactions. [11] The advantages of the LZH for the drug delivery includes improved delivery of poorly water-soluble drugs, [12] lowered systemic toxicity of drug, [13] and the ability to optimise drug release rate. [14] LZH nanocarriers are unstable in low pH medium when dissolved in liposomes at pH 4.5À5, zinc anions released and become part of the nutrient cycle.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterisation and sustained release properties of layered zinc hydroxide intercalated with amoxicillin trihydrate

Nabipour

Sadr

Thomas

2015

Journal of Experimental Nanoscience

View full text Add to dashboard Cite

The intercalation of amoxicillin trihydrate (AMOX) into layered zinc hydroxide (LZH) has been achieved via ion-exchange method. The resulted nanocomposite (AMOX-LZH) has been thoroughly characterised by a number of techniques including powder X-ray diffraction (PXRD), FT-IR spectroscopy, TGA/DTG analysis and scanning electron microscopy (SEM). The PXRD results showed that the gallery height of LZH was expanded from 9.57 to 11.97 A , indicating that the AMOX anions were successfully intercalated into the interlayer space of LZHs. The increased thermal stability of nanocomposite was confirmed by TGA/ DTG analyses. Improved antibacterial activity and minimum inhibitory concentration of AMOX-LZH nanocomposite was evaluated against Grampositive bacteria Staphylococcus aureus, Klebsiella pneumonia and Gram-negative Escherichia coli using the disk diffusion technique. The sustained release of amoxicillin drug from the AMOX-LZH nanocomposite was also verified.

show abstract

Intercalation and functionalization of zinc hydroxide nitrate with mono- and dicarboxylic acids

Cited by 71 publications

References 19 publications

Effect of confinement of anionic organic ultraviolet ray absorbers into two-dimensional zinc hydroxide nitrate galleries

Effect of confinement of anionic organic ultraviolet ray absorbers into two-dimensional zinc hydroxide nitrate galleries

Effects of precursor concentration and reaction time on sonochemically synthesized ZnO nanoparticles

Synthesis, characterisation and sustained release properties of layered zinc hydroxide intercalated with amoxicillin trihydrate

Contact Info

Product

Resources

About