A novel synthetic route to natural rubber/montmorillonite nanocomposites using colloid stabilization–destabilization method

Lee, Chan‐Woo; Hwang, Taehyun; Nam, Gi-Yong; Hong, Jeong Hee; Lee, Dong-Ah; Oh, Joon-Suk; Kwak, Sung Bok; Lee, Seong-Hoon; Lee, Wan-Sul; Yang, Ki Yeon; Park, Jong-Min; Lee, Yong Sang; Chung, Kyung Ho; Lee, Youngkwan; Choi, Hyouk Ryeol; Nam, Jae‐Do

doi:10.1016/j.compositesa.2011.08.007

Cited by 15 publications

(4 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As figure 1(a) shows, there are two peaks in the XRD pattern of REC, and its interlayer distance is 2.45 nm, calculated by Bragg's equation. In contrast with REC, no diffraction peak was found in all QCRAg nanocomposites, indicating that the REC layers were exfoliated [8], and the result is different from our previous study [7]. It reveals that the formation of Ag NPs produced a large driving force to make clay layer exfoliate.…”

Section: Resultscontrasting

confidence: 86%

Green fabrication of quaternized chitosan/rectorite/Ag NP nanocomposites with antimicrobial activity

Luo¹,

Xie²,

Wang³

2014

Biomed. Mater.

View full text Add to dashboard Cite

Silver nanoparticles (Ag NPs) were synthesized rapidly in one pot via the Tollens reaction, in which quaternized chitosan (QCS) and rectorite (REC) acted as the reducing and stabilizing agent, while other chemical reducing and stabilizing agents and the surfactant were not included. X-ray diffraction, scanning electron microscopy and transmission electron microscopy results showed that spherical Ag NPs with uniform sizes were obtained, the layers of clay were peeled and thus exfoliated QCS/REC/Ag NP (QCRAg) nanocomposite was achieved. Moreover, Ag NPs dispersed well in the exfoliated nanocomposite matrix, some Ag NPs even entered into the interlayer of REC. QCRAg nanocomposites showed strong antimicrobial activity; the lowest minimum inhibitory concentration against Staphyloccocus aureus was only 0.0001% (w/v). The study reveals that the obtained QCRAg nanocomposites have great potential for biomedical applications.

show abstract

Section: Resultscontrasting

confidence: 86%

Green fabrication of quaternized chitosan/rectorite/Ag NP nanocomposites with antimicrobial activity

Luo¹,

Xie²,

Wang³

2014

Biomed. Mater.

View full text Add to dashboard Cite

show abstract

“…In contrast, when the particles take low zeta potential, there is little repulsive force among the particles, leading to agglomeration. 31 The pH value of the colloid usually affects the zeta potential of the colloidal particles. The colloid is considered to be stable in the zeta potential range more positive than +30 mV or more negative than À30 mV.…”

Section: Resultsmentioning

confidence: 99%

An interleaved porous laminate composed of reduced graphene oxide sheets and carbon black spacers by in situ electrophoretic deposition

Wang

Ghosh

et al. 2014

RSC Adv.

Self Cite

View full text Add to dashboard Cite

Although the graphene-based materials have a great potential to be used for various energy storage devices, the expected performance of graphene has not been achieved yet seemingly due to the lack of interconnected porosity and actively-exposed surface area that should be developed in the re-stacked graphene electrodes. Herein we used an electrophoretic deposition (EPD) method to fabricate a binderfree porous supercapacitor electrode composed of reduced graphene oxide (RGO) sheets and conductive carbon black (CB) particles. Applying EPD for an electrostatically-stabilized aqueous mixture of RGO and CB nanoparticles, the electrophoretic squeezing force in EPD induced the RGO sheets to align in the in-plane direction along with the CB particles placed in the interlayers of RGO. The developed ladder-like interleaved composite structure allowed a desirable porosity network and conductive path for a facile movement of ions and electrons. Controlling the ratios of concentrations (C s,RGO /C s,CB ) and/or zeta potentials (x RGO /x CB ) of the RGO and CB nanoparticles in aqueous mixtures, different nanostructures of the interleaved RGO/CB laminates could be fabricated. Thoroughly tested as a supercapacitor electrode in an organic electrolyte (TEA BF 4 ), the developed RGO/CB electrodes provided excellent performance of the specific capacitance of 218 F g À1 at a scan rate of 1 mV s À1 (133.3 F g À1 at a current density of 2 A g À1 ), energy density of 43.6 W h kg À1 and power density of 71.3 kW kg À1 .It is believed that an ideal performance of intrinsic graphene properties could be exerted by the unique nanostructure of binder-free interleaved graphene laminates as developed by the scalable in situ EPD process for large-volume production.

show abstract

“…Graphene@PS core–shell spheres are fabricated via the electrostatic self-assembly of positively charged graphene nanosheets and anionic PS spheres, following the stabilization–destabilization method. ,, The graphene dispersion (16 mL) is diluted with deionized water (400 mL) and sonicated tip-wise for 6 h, resulting in a stable dispersion. The diluted graphene dispersion is added dropwise to a PS emulsion (80 mL) diluted with 800 mL of deionized water under vigorous stirring at pH 4.…”

Section: Methodsmentioning

confidence: 99%

Frequency-Selective Radar-Absorbing Composites Using Hybrid Core–Shell Spheres

Hwang,

Nam

2024

ACS Nano

Self Cite

View full text Add to dashboard Cite

Radar-absorbing materials (RAMs) covering the exterior surfaces of installed parts and assembled devices are crucial in absorbing most incident electromagnetic (EM) waves. This absorption minimizes reflected energy, thereby enhancing pilot safety and the stability of operating electronic devices without interference. Particularly, active stealth aircraft require effective protection from near-and far-field EM radiation across a wide spectrum of frequencies from both highly integrated electronic components and advanced enemy radars. Studies of RAMs often prioritize absorption over crucial tunability in frequency selectivity, revealing a research gap. In this study, we propose smart RAMs with frequency-selective absorption capabilities. Our approach involves incorporating two types of core−shell spheres in a polymer matrix, which feature shells of either wave-diffuse reflecting metal or wave-absorbing graphene. The key innovation lies in the ability to tailor absorption frequencies in the X-band range (8.2−12.4 GHz) by adjusting the interstitial spaces between the metallic spheres while the scattered waves are efficiently attenuated by graphene networks in the composites. On a metal substrate, a 2 mmthick composite with an optimized structural composition and ratio of the two types of spheres exhibits a maximum absorption efficiency of 99.3%, effectively trapping and extinguishing incident waves. Combined with the structural tunability and frequency-selective properties of spherical fillers, our approach provides a scalable and effective method for creating functional isotropic coverings on various metallic surfaces.

show abstract

A novel synthetic route to natural rubber/montmorillonite nanocomposites using colloid stabilization–destabilization method

Cited by 15 publications

References 10 publications

Green fabrication of quaternized chitosan/rectorite/Ag NP nanocomposites with antimicrobial activity

Green fabrication of quaternized chitosan/rectorite/Ag NP nanocomposites with antimicrobial activity

An interleaved porous laminate composed of reduced graphene oxide sheets and carbon black spacers by in situ electrophoretic deposition

Frequency-Selective Radar-Absorbing Composites Using Hybrid Core–Shell Spheres

Contact Info

Product

Resources

About