Triple shape-memory effect by silanized polyurethane/silane-functionalized graphene oxide nanocomposites bilayer

Kim, Yoon Jun; Hc, Park; Kim, BK

doi:10.1177/0954008314565398

Cited by 17 publications

(9 citation statements)

References 28 publications

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“…The spectrum of the pretreated, functionalized PA12 membrane presented an intense band at 1078 cm −1 , typical of the Si-O-Si group, and at 943 cm −1 , due to the Si-OH bond, confirming that the PA12 membrane was functionalized using TEOS and APTES, as reported by Souza et al [3]. and Kim et al [29].…”

Section: Resultssupporting

confidence: 81%

Silver nanoparticle incorporation into flexible polyamide 12 membranes

Souza

Batista

Faria

et al. 2022

J Sol-Gel Sci Technol

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To meet the demands of the market and society, the development of structured polymeric materials for application in the medical field is constantly increasing. Over the last decades, metallic silver nanoparticles have been explored due to their antimicrobial action. Here, we aimed to incorporate metallic silver nanoparticles into polymeric pieces obtained by additive manufacture via a chemical route involving silver nitrate and sodium borohydride. Polyamide 12 membranes were obtained by selective laser sintering, which was followed by washing, pretreatment, and functionalization with the alkoxides tetraethylorthosilicate and 3-aminopropyl tetraethoxysilane. For nanoparticle preparation and incorporation, a chemical route was tested under different conditions. The samples were characterized by techniques, such as X-ray diffraction, ultravioletvisible spectroscopy, and infrared vibrational spectroscopy. Nanoparticle formation and incorporation into the polyamide 12 membranes were demonstrated by the absorbance band at 420 nm, which indicated that the particles measured between 10 and 50 nm in size; by the X-ray diffraction peaks at 2θ = 38, 44, and 64°, which are typical of crystalline silver; and by vibrational spectroscopy, which evidenced that the nanoparticles interacted with the polyamide 12 nitrogen groups. Polyamide 12 membranes containing metallic silver nanoparticles have promising biomedical applications as antimicrobial wound dressings associated with drug carriers.

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Section: Resultssupporting

confidence: 81%

Silver nanoparticle incorporation into flexible polyamide 12 membranes

Souza

Batista

Faria

et al. 2022

J Sol-Gel Sci Technol

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“…FT-IR spectrum of GOA showed the functional groups of N-C (1388 cm −1 ), C-Si (774 cm −1 ), Si-O (1078 cm −1 ), C-O (1103 cm −1 ), OH (up to 3000 cm −1 ), and SP 3 CH (2934 cm −1 ) that corresponded to this intermediate. 12 In the next step, GOA sheets were grafted to spermine in DMF as solvent, at 70°C to achieve the GO-supported-APTES-spermine that known as GOAS.…”

Section: Discussionmentioning

confidence: 99%

<p>Nano-Graphene Oxide-supported APTES-Spermine, as Gene Delivery System, for Transfection of pEGFP-p53 into Breast Cancer Cell Lines</p>

Mirzaie

Ansari

Nematollahi-Mahani

et al. 2020

DDDT

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Purpose Genetic diseases can be the result of genetic dysfunctions that happen due to some inhibitory and/or environmental risk factors, which are mostly called mutations. One of the most promising treatments for these diseases is correcting the faulty gene. Gene delivery systems are an important issue in improving the gene therapy efficiency. Therefore, the main purpose of this study was modifying graphene oxide nanoparticles by spermine in order to optimize the gene delivery system. Methods Graphene oxide/APTES was modified by spermine (GOAS) and characterized by FT-IR, DLS, SEM and AFM techniques. Then pEGFP-p53 was loaded on GOAS, transfected into cells and evaluated by fluorescent microscopy and gene expression techniques. Results FT-IR data approved the GOAS sheet formation. Ninety percent of the particles were less than 56 nm based on DLS analysis. SEM analysis indicated that the sheets were dispersed with no aggregation. AFM results confirmed the dispersed structures with thickness of 1.25±0.87 nm. STA analysis showed that GOAS started to decompose from 400°C and was very unstable during the heating process. The first weight loss up to 200°C was due to the evaporation of absorbed water, the second one observed in the range of 200–550°C was assigned to the decomposition of labile oxygen- and nitrogen-containing functional groups, and the third one above 550°C was attributed to the removal of oxygen functionalities. In vitro release of DNA demonstrated the efficient activity of the new synthesized system. Ninety percent of the cells were transfected and showed the GFP under fluorescence microscopy, and TP53 gene was expressed 51-fold in BT-20 cells compared to β-actin as the reference gene. Flow cytometry analysis confirmed the apoptosis of the cells rather than necrosis. Conclusion It could be concluded that the new synthesized structure could transfer a high amount of the therapeutic agent into cells with best activity.

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“…A composite with triple stage shape memory performance was demonstrated by combining chemically modified graphene oxide with an interpenetrating polymer network of polyurethane with two different molecular weights [ 117 ].…”

Section: Properties and Multifunctional Applications Of Conducting Polymersmentioning

confidence: 99%

Recent Trends and Developments in Conducting Polymer Nanocomposites for Multifunctional Applications

et al. 2021

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Electrically-conducting polymers (CPs) were first developed as a revolutionary class of organic compounds that possess optical and electrical properties comparable to that of metals as well as inorganic semiconductors and display the commendable properties correlated with traditional polymers, like the ease of manufacture along with resilience in processing. Polymer nanocomposites are designed and manufactured to ensure excellent promising properties for anti-static (electrically conducting), anti-corrosion, actuators, sensors, shape memory alloys, biomedical, flexible electronics, solar cells, fuel cells, supercapacitors, LEDs, and adhesive applications with desired-appealing and cost-effective, functional surface coatings. The distinctive properties of nanocomposite materials involve significantly improved mechanical characteristics, barrier-properties, weight-reduction, and increased, long-lasting performance in terms of heat, wear, and scratch-resistant. Constraint in availability of power due to continuous depletion in the reservoirs of fossil fuels has affected the performance and functioning of electronic and energy storage appliances. For such reasons, efforts to modify the performance of such appliances are under way through blending design engineering with organic electronics. Unlike conventional inorganic semiconductors, organic electronic materials are developed from conducting polymers (CPs), dyes and charge transfer complexes. However, the conductive polymers are perhaps more bio-compatible rather than conventional metals or semi-conductive materials. Such characteristics make it more fascinating for bio-engineering investigators to conduct research on polymers possessing antistatic properties for various applications. An extensive overview of different techniques of synthesis and the applications of polymer bio-nanocomposites in various fields of sensors, actuators, shape memory polymers, flexible electronics, optical limiting, electrical properties (batteries, solar cells, fuel cells, supercapacitors, LEDs), corrosion-protection and biomedical application are well-summarized from the findings all across the world in more than 150 references, exclusively from the past four years. This paper also presents recent advancements in composites of rare-earth oxides based on conducting polymer composites. Across a variety of biological and medical applications, the fact that numerous tissues were receptive to electric fields and stimuli made CPs more enticing.

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Triple shape-memory effect by silanized polyurethane/silane-functionalized graphene oxide nanocomposites bilayer

Cited by 17 publications

References 28 publications

Silver nanoparticle incorporation into flexible polyamide 12 membranes

Silver nanoparticle incorporation into flexible polyamide 12 membranes

<p>Nano-Graphene Oxide-supported APTES-Spermine, as Gene Delivery System, for Transfection of pEGFP-p53 into Breast Cancer Cell Lines</p>

Recent Trends and Developments in Conducting Polymer Nanocomposites for Multifunctional Applications

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