Antonio G.B. Pereira
University of California, Davis
Composite numberSelf-healing hydrogelsNuclear chemistryAdsorptionComposite materialFourier transform infrared spectroscopyDesorptionControlled releaseNanotechnologyOrganic chemistryChemistryPolymer chemistryMaterials scienceSwelling capacitySwellingCelluloseChitosanAcrylic acidChitinChemical engineeringCrystallinityPolymerStarchNanocomposite
39Publications
25H-index
1,784Citations
Publications 38
Newest
#2Cátia S. NunesH-Index: 6
Last. André R. Fajardo (UFPEL: Universidade Federal de Pelotas)H-Index: 29
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Abstract Hydrogels based on biopolymers like Gum Arabic (GA) usually show low applicability due to weak mechanical properties. To overcome this issue, (nano)fillers are utilized as reinforcing agents. Here, GA hydrogels were reinforced by chitin nanowhiskers (CtNWs, aspect ratio of 14) isolated from the biopolymer chitin through acid hydrolysis. Firstly, GA was chemically modified with glycidyl methacrylate (GMA), which allowed its crosslinking by free radical reactions. Next, hydrogel samples c...
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Last. André R. Fajardo (UFPEL: Universidade Federal de Pelotas)H-Index: 29
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Abstract Dye-contamination in water supplies, industrial effluents, and rivers is one of the major water pollution issues. It has put at risk the drinking-water supplies around the globe. Various remediation approaches have been extensively developed and tested to minimize this worrying scenery. In particular, adsorption techniques are often ranked as one of the most prominent strategies to treat dye-contaminated water likely due to their attractive practical and economic advantages. Overall, th...
11 CitationsSource
#1Antonio G.B. Pereira (UC Davis: University of California, Davis)H-Index: 25
#2André R. Fajardo (UFPEL: Universidade Federal de Pelotas)H-Index: 29
Last. You-Lo Hsieh (UC Davis: University of California, Davis)H-Index: 59
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Abstract Physical adsorption has shown to be facile and highly effective to deposit chitosan nanowhiskers (CsNWs, 60 % deacetylated, length: 247 nm, thickness: 4–12 nm, width:15 nm) on electrospun cellulose acetate nanofibers (CANFs, 560 nm) to effect complete surface charge reversal from negatively charged CANFs (−40 mV) to positively charged CsNWs-adsorbed CANFs (+8 mV). The CsNWs coverage did not alter the smooth and homogeneous morphology of fibers, as observed from SEM images. Biological as...
4 CitationsSource
#1Cristiane Spagnol (UEM: Universidade Estadual de Maringá)H-Index: 6
#2Elizângela H. Fragal (UEM: Universidade Estadual de Maringá)H-Index: 8
Last. Adley F. Rubira (UEM: Universidade Estadual de Maringá)H-Index: 50
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Abstract Antimicrobial films based on distinct polymer matrices, poly (vinyl alcohol) (PVA) or poly (N-isopropylacrylamide) (PNIPAAm), and silver nanoparticles (AgNPs) immobilized onto cellulose nanowhiskers (CWs) were successfully prepared by either casting or electrospinning. CWs were first functionalized with carboxylate groups (labeled as CWSAc) and later they were immersed in a silver nitrate solution (AgNO3). After Ag+ ions anchored in the COO− groups are chemically reduced to produce AgNP...
25 CitationsSource
#1Késsily B. RufatoH-Index: 5
#2Juliana P. GaldinoH-Index: 1
Last. Edvani C. MunizH-Index: 5
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7 CitationsSource
Abstract Cellulose nanowhiskers (CNWs, 90% crystalline) were used to enhance the adsorption capacity of chitosan-g-poly(acrylic acid) hydrogel. The composites up to 20 w/w-% CNWs showed improved adsorption capacity towards methylene blue (MB) as compared to the pristine hydrogel. At 5 w/w-% CNWs the composite presented the highest adsorption capacity (1968 mg/g). The maximum removal of MB (>98% of initial concentration 2000 mg/L) was achieved quickly (60 min) at room temperature, pH 6, and at lo...
78 CitationsSource
Background: Gold nanoparticles (AuNPs) have enormous potential for application in imaging, diagnosis, and therapies in the medical field. AuNPs are renowned for their localized surface plasmon resonance (LSPR) properties, large surface area, and biocompatibility with body fluids. Further, AuNPs have featured prominently in new methodologies for cancer treatments, like photothermal and imaging therapies. Although AuNPs present enormous potential for application in the medical field, their instabi...
24 CitationsSource
#1André R. FajardoH-Index: 29
Last. You-Lo Hsieh (University of California, Berkeley)H-Index: 1
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3 CitationsSource
Superabsorbent hydrogels composites based on the biopolymer starch (ST) and rice husk ash (RHA) were successfully developed and tested towards the removal of methylene blue (MB), a cationic dye. RHA content hit the morphology, mechanical and water uptake properties of the composite. Batch adsorption experiments, carried out under pH 5 at 33 °C and with 2000 mg L−1 as the initial concentration of MB, showed that at 5 wt% RHA the composite exhibited a remarkable adsorption capacity reaching up to ...
23 CitationsSource
Last. Edvani C MunizH-Index: 2
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Although the electrospinning (ES) is known for almost 80 years, only in the last two decades this technique has been widely used for obtaining micro- and/or nanofibers. Several aspects contributed for spreading the electrospinning, for instance, the easy operational aspects, affordable equipment, and highly versatile design setup, among others. So, in view of materials chemistry, the electrospinning is one of paramount techniques for processability of polymers and product development at submicro...
3 CitationsSource