Polyol‐Mediated Synthesis of Zinc Oxide Nanorods and Nanocomposites with Poly(methyl methacrylate)

Anžlovar, Alojz; Orel, Zorica Crnjak; Kogej, Ksenija; Žigon, Majda

doi:10.1155/2012/760872

Cited by 95 publications

(52 citation statements)

References 65 publications

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“…[21][22][23][24][25][26][27] ZnO is an environmentally friendly, important and attractive semiconducting material. It has drawn enormous research attention due to its distinguished properties in optics, photonics and electronics.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO on the Thermal Degradation Behavior of Poly(Methyl Methacrylate) Nanocomposites

Japić

Marinšek

Orel

2016

ACSi

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In the memory of Janez (Janko) Jamnik our dear friend and co-worker. AbstractThe influence of ZnO nanoparticles on the thermal degradation behavior of poly(methyl methacrylate) (PMMA) was tested using thermoanalytical techniques. The studied materials were investigated using TG, DTA, EGA, XRD, SEM and TEM. The ZnO nanoparticles were synthesized via precipitation by adding LiOH into Zn 2+ water/ethylene glycol solutions. The ZnO-PMMA nanocomposites were prepared by adding the appropriate amount of ZnO into MMA and subsequent MMA radical polymerization. According to the experimental results and model-free isoconversional activation energy calculations, the addition of ZnO into PMMA played a double role. The ZnO concentrations up to 0.15% stabilized the composite by shifting the degradation interval toward higher temperatures and increasing the apparent activation energy relative to pure PMMA. At higher concentrations, the catalytic effect of ZnO started to prevail and was reflected in the lower temperature intervals of intense PMMA degradation and lower apparent activation energy. The addition of ZnO generally did not change the nature of the PMMA decomposition process.

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Section: Introductionmentioning

confidence: 99%

Effect of ZnO on the Thermal Degradation Behavior of Poly(Methyl Methacrylate) Nanocomposites

Japić

Marinšek

Orel

2016

ACSi

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“…Therefore, our goal was to prepare nanocrystalline ZnO with high inherent antimicrobial activity before any further surface modification. Out of several synthetic approaches towards ZnO nanomaterials from our past work [64][65][66] (not shown) we opted for synthesis of ZnO nanocrystals following modified procedure presented in the work of Ghoshal et al 56 . Namely, the ethyleneglycol/water solvent mixture afforded sufficient conditions to effectively produce highly nanocrystalline ZnO at rather low temperature (90 °C, 2 h) in favourable yields (45 %).…”

Section: Resultsmentioning

confidence: 99%

Amino- and ionic liquid-functionalised nanocrystalline ZnO via silane anchoring – an antimicrobial synergy

et al. 2015

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The synthesis of highly antimicrobial nanocrystalline zinc oxide and its covalent modifications is presented. In order to achieve further improvement of antimicrobial activity, surface of ZnO was effectively modified with selected silanes comprising amino-and ionic liquidfunctionalities. We demonstrate for the first time ionic liquid surface immobilization on ZnO and application of this hybrid material for antimicrobial purposes. Different microscopic and spectroscopic techniques as well as size, surface and elemental composition analysis were employed to prove these modifications. Characterisations revealed that surface and antimicrobial properties strongly depend on the modification employed. Most of the aminoand ionic liquid-functionalised nanocrystalline ZnO exhibited improved antimicrobial activity compared to commercially available silane-containing antimicrobial agent attached to nanocrystalline ZnO. Bacterial growth reduction was assessed by following optical density of bacterial growth with different concentrations of the novel antimicrobial nanomaterials. Complete bacterial inactivation was achieved for specific amino-and ionic liquidmodifications at 0.125 g L -1 , revealing synergistic effect of ZnO and its modifications, exhibiting up to 2-fold improvement compared to unmodified ZnO.

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“…The FL-ZnO-PMMA composites showed the most distinct peaks indicating the existence of ZnO crystal structure in the polymer matrix. The peaks in X-ray spectra of FL-ZnO-PMMA composites, which correspond to the (100), (002), (101), (110) and (103) basal diffraction of wurtzite ZnO hexagonal phase of ZnO nanoparticles [15][16][17][18][19][20]. XRD patterns showed here exhibit the crystal structure of ZnO in polymer matrix.…”

Section: Fig 3:-ftir Spectra Of the Zno-pmma Composites With Differementioning

confidence: 87%

“…Therefore, theoretically, we can harvest high efficient UV exciton emission and laser at room temperature, which will strongly prompt the applications of UV laser in the fields of benthal detection, communication and optical memory with magnitude enhancement in the performance [17][18][19]. Moreover, the melting point of ZnO is 1975 °C, which determines its high thermal and chemical stability [19][20]. Plus, ZnO has owned a huge potentially commercial value due to its cheaper price, abundant resources in the nature, environment friendly, simply fabrication process and so on.…”

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SPECIFIC HEAT CAPACITY OF FLOWERLIKE ZnO-PMMA COMPOSITES INVESTIGATED BY DSC.

Ijar¹,

Gültek²,

Sezer³

et al. 2017

IJAR

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A series flowerlike ZnO-PMMA (FL-ZnO-PMMA) composites were synthesized from PMMA and different amount of flowerlike ZnO (FLZnO) particles via the solution direct-dispersing and in-situ polymerization method. FL-ZnO particles have been synthesized using the hydrothermally technique. Effects of synthesis conditions on the crystal structure, crystallite size, microstructure and morphological properties of the produced FL-ZnO particles were investigated by FTIR, X-ray and SEM. The prepared ZnO nanostructures with flowerlike morphology have been blended with methyl methacrylate and this solution was polymerized by in-situ radical polymerization technique to prepare FL-ZnO-PMMA composite films. The obtained nanocomposite films are highly transparent, flexible and chemically stable. Investigation of specific heat capacity of composites is achieved by using differential scanning calorimeter. This study is unique about exploration of effect of FL-ZnO amount on specific heat capacity of polymeric composites.Copy Right, IJAR, 2017,. All rights reserved. …………………………………………………………………………………………………….... Introduction:-Since the beginning of this century, in the science and engineering have seen a rapid increase in interest for synthesis of the materials at the nano scale. Nanomaterials have attracted a great deal of research attention due to their potential use as catalysts, sensors, ceramic and biomaterial because of the physical, electronic, and magnetic properties resulting from their quantum size [1-3]. The potential for nanotechnology is immensely diverse with potential applications in the fields of electronics, biomedical devices, energy applications, military uses, and waste management [3][4][5]. Nanomaterials could be utilized to design nanotransistors, to develop and deliver medicines for locally treating diseases and ailments within the body, and for the creation new age weapons and armor for military applications [6][7][8]. Within the field of nanomaterials under worldwide research is the subset of electronic nanomaterials and optic nanoparticles.Specific heat capacity as a basic thermal property is one of the main parameters for evaluation, calculation and design of thermal system. It is defined as the required heat per unit mass of material when raising 1°C. Composites have an extremely broad usage range, and there are different requirements on specific heat capacity according to different cases. For example, for high-temperature heat shielding composites used in a short term, high specific heat is required in order to absorb more heat in use; however, for thermal sensitive function composites, small specific heat is required in order to have a higher thermal sensitivity. By the addition of fillers to plastics the thermal behavior of polymers and composites can be increased significantly [9][10][11][12][13][14].

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Polyol‐Mediated Synthesis of Zinc Oxide Nanorods and Nanocomposites with Poly(methyl methacrylate)

Cited by 95 publications

References 65 publications

Effect of ZnO on the Thermal Degradation Behavior of Poly(Methyl Methacrylate) Nanocomposites

Effect of ZnO on the Thermal Degradation Behavior of Poly(Methyl Methacrylate) Nanocomposites

Amino- and ionic liquid-functionalised nanocrystalline ZnO via silane anchoring – an antimicrobial synergy

SPECIFIC HEAT CAPACITY OF FLOWERLIKE ZnO-PMMA COMPOSITES INVESTIGATED BY DSC.

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