Carboxybetaine Polymer-Protected Gold Nanoparticles: High Dispersion Stability and Resistance against Non-Specific Adsorption of Proteins

2007 ◽  
Vol 208 (8) ◽  
pp. 862-873 ◽  
Author(s):  
Kazuhiro Matsuura ◽  
Kohji Ohno ◽  
Shigehiro Kagaya ◽  
Hiromi Kitano
Keyword(s):  
Gold Nanoparticles ◽  
Specific Adsorption ◽  
Dispersion Stability ◽  
High Dispersion

scholarly journals Enhanced dispersion stability of gold nanoparticles by the physisorption of cyclic poly(ethylene glycol)

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Yubo Wang ◽  
Jose Enrico Q. Quinsaat ◽  
Tomoko Ono ◽  
Masatoshi Maeki ◽  
Manabu Tokeshi ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ethylene Glycol ◽  
Dispersion Stability ◽  
Chemical Inhomogeneity ◽  
Poly Ethylene Glycol ◽  
Alternative Approach ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Tumor Accumulation ◽  
Key Techniques

AbstractNano-sized metal particles are attracting much interest in industrial and biomedical applications due to the recent progress and development of nanotechnology, and the surface-modifications by appropriate polymers are key techniques to stably express their characteristics. Herein, we applied cyclic poly(ethylene glycol) (c-PEG), having no chemical inhomogeneity, to provide a polymer topology-dependent stabilization for the surface-modification of gold nanoparticles (AuNPs) through physisorption. By simply mixing c-PEG, but not linear counterparts, enables AuNPs to maintain dispersibility through freezing, lyophilization, or heating. Surprisingly, c-PEG endowed AuNPs with even better dispersion stability than thiolated PEG (HS–PEG–OMe). The stronger affinity of c-PEG was confirmed by DLS, ζ-potential, and FT-IR. Furthermore, the c-PEG system exhibited prolonged blood circulation and enhanced tumor accumulation in mice. Our data suggests that c-PEG induces physisorption on AuNPs, supplying sufficient stability toward bio-medical applications, and would be an alternative approach to the gold–sulfur chemisorption.

Environmentally Friendly Synthesis of p-Doped Reduced Graphene Oxide with High Dispersion Stability by Using Red Table Wine

2015 ◽  
Vol 10 (5) ◽  
pp. 1192-1197 ◽  
Author(s):  
Suk-Joon Kim ◽  
Jang Mi Lee ◽  
Roy Arup Kumer ◽  
Sung Young Park ◽  
Sang Chun Kim ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Environmentally Friendly ◽  
Dispersion Stability ◽  
High Dispersion ◽  
Reduced Graphene

scholarly journals Site-specific adsorption of gold nanoparticles coated with thermo-responsive peptides

2012 ◽  
Vol 45 (5) ◽  
pp. 523-528 ◽  
Author(s):  
Nobuyuki Higashi ◽  
Takayuki Ochiai ◽  
Chie Kanazawa ◽  
Tomoyuki Koga
Keyword(s):  
Gold Nanoparticles ◽  
Specific Adsorption ◽  
Site Specific

Comparison of the antioxidant activity of catalase immobilized on gold nanoparticles via specific and non-specific adsorption

2018 ◽  
Vol 171 ◽  
pp. 707-714 ◽  
Author(s):  
Ewa Czechowska ◽  
Katarzyna Ranoszek-Soliwoda ◽  
Emilia Tomaszewska ◽  
Agnieszka Pudlarz ◽  
Grzegorz Celichowski ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Gold Nanoparticles ◽  
Specific Adsorption

Enhanced creep behavior of carbon black/epoxy composites with high dispersion stability by fluorination

2019 ◽  
Vol 29 (6) ◽  
pp. 643-648
Author(s):  
Kyung Hoon Kim ◽  
Min-Ji Kim ◽  
Ji Wook Kim ◽  
Kyeong Min Lee ◽  
Hyeong Gi Kim ◽  
...  
Keyword(s):  
Carbon Black ◽  
Creep Behavior ◽  
Dispersion Stability ◽  
Epoxy Composites ◽  
High Dispersion

scholarly journals Modified graphene as novel lubricating additive with high dispersion stability in oil

Friction ◽  
2020 ◽  
Vol 9 (1) ◽  
pp. 143-154 ◽  
Author(s):  
Pu Wu ◽  
Xinchun Chen ◽  
Chenhui Zhang ◽  
Jiping Zhang ◽  
Jianbin Luo ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Wear Track ◽  
Normal Load ◽  
Lubricant Additive ◽  
Tribological Performance ◽  
Dispersion Stability ◽  
High Dispersion ◽  
Base Oil ◽  
The Coefficient Of Friction ◽  
Modified Graphene

Abstract Graphene is a promising material as a lubricant additive for reducing friction and wear. Here, a dispersing method which combines chemical modification of graphene by octadecylamine and dicyclohexylcarbodiimide with a kind of effective dispersant has been successfully developed to achieve the remarkable dispersion stability of graphene in base oil. The stable dispersion time of modified graphene (0.5 wt%) with dispersant (1 wt%) in PAO-6 could be up to about 120 days, which was the longest time reported so far. At the same time, the lubricant exhibits a significant improvement of tribological performance for a steel ball to plate tribo-system with a normal load of 2 N. The coefficient of friction between sliding surfaces was ~0.10 and the depth of wear track on plate was ~21 nm, which decreased by about 44% and 90% when compared to pure PAO-6, respectively. Furthermore, the analysis of the lubricating mechanisms in regard to the sliding-induced formation of nanostructured tribo-film has been contacted by using Raman spectra and TEM.

Control of the Particle Size of Gold on Tin Modified Silica Support

2008 ◽  
Vol 589 ◽  
pp. 155-160
Author(s):  
Ferenc Somodi ◽  
Irina Borbáth ◽  
Mihály Hegedűs ◽  
István E. Sajó ◽  
József L. Margitfalvi
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Ph Value ◽  
Synthesis Method ◽  
Hydrogen Atmosphere ◽  
High Dispersion ◽  
Chloroauric Acid ◽  
Silica Support ◽  
Gold Solution ◽  
Modified Silica

In this study we describe a two-step synthesis method for the preparation of gold nanoparticles supported on tin modified silica. The key step of the preparation procedure is the formation of surface grafted organotin complexes. The reduction of these surface species in a hydrogen atmosphere resulted in both metallic (Sno) and ionic (Sn2+) forms of tin. These forms of tin are capable to reduce gold from chloroauric acid solution forming gold nanoparticles with high dispersion on the surface of silica. It has been found that the particle size of gold strongly depends on the pH value of the gold solution and the presence or absence of ammonia.

scholarly journals High dynamic range and high dispersion stability of a magnetorheological grease damper for semi-active vibration suppression

2021 ◽  
pp. 1045389X2110188
Author(s):  
Toshihiko Shiraishi ◽  
Shuto Nagamatsu ◽  
Hirotaka Misaki
Keyword(s):  
Performance Test ◽  
Dynamic Range ◽  
Vibration Suppression ◽  
High Dynamic Range ◽  
Dispersion Stability ◽  
High Dispersion ◽  
Test Results ◽  
Active Vibration Suppression ◽  
Active Vibration ◽  
High Dynamic

In this study, the dynamic range and dispersion stability of a shear-type magnetorheological (MR) grease damper were experimentally investigated as important characteristics affecting the performance of semi-active vibration suppression. Furthermore, the damper was applied to the semi-active vibration suppression of a small single-degree-of-freedom model structure subjected to seismic excitation. The performance test results of the damper indicated that it has a dynamic range of 157 times, which is much higher than that of conventional MR dampers. Also, because of the high dispersion stability of MR grease, the results showed that its performance can be kept for 9 days longer in comparison with a similar damper using MR fluid. Moreover, the structural vibration suppression test results demonstrated that the damper can suppress vibration response over a wide frequency range by applying skyhook-based control, which can take full advantage of the damper’s high dynamic range.

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