scholarly journals Self-Assembled Multilayers and Photoluminescence Properties of a New Water-Soluble Poly(Para-Phenylene)

1997 ◽  
Vol 488 ◽  
Author(s):  
Xiaobo Shi ◽  
DeQuan Li ◽  
M. Lütt ◽  
M. R. Fitzsimmons ◽  
G. P. Van Patten
Keyword(s):  
Uv Light ◽  
Water Soluble ◽  
Solubility In Water ◽  
Dimethyl Ammonium ◽  
Wide Ph Range ◽  
Dilute Aqueous Solutions ◽  
Self Assembled ◽  
Ph Range ◽  
Positively Charged ◽  
Soluble Poly

AbstractThis paper reports the synthesis and characterizations of a new water-soluble poly(paraphenylene) (PPP) and its applications in preparing self-assembled multi-layer films. This new water-soluble conducting polymer was prepared through the sulfonation reaction of poly(pquarterphenylene- 2,2'-dicarboxylic acid). The incorporation of sulfonate groups has dramatically improved PPP's solubility in water at a wide pH range, whereas previous PPP is only slightly soluble in basic solutions. Dilute aqueous solutions of this polymer with acidic, neutral or basic pH emit brilliant blue light while irradiated with UV light. The sulfonated PPP emits from 350 nm to 455 nm with a maximum intensity at 380 nm. Self-assembled multilayers of this sulfonated PPP were constructed with a positively charged polymer poly(diallyl dimethyl ammonium chloride) and characterized with various surface analyses. Conductive (RuO2 and ITO), semiconductive (Si wafer), and non-conductive (SiO2) substrates were used in the preparation of self-assembled multilayers. Electrical, optical and structural properties of these novel self-assembled thin films will be discussed.

scholarly journals Synthesis of water-soluble chitosan for biomedical applications

2015 ◽  
Vol 18 (3) ◽  
pp. 170-180
Author(s):  
Anh Thi Tram Tu ◽  
Huy Thuc Ha
Keyword(s):  
Drug Delivery ◽  
Molecular Weight ◽  
Iron Oxide ◽  
Biomedical Applications ◽  
Drug Delivery Systems ◽  
Water Soluble ◽  
Oxide Nanoparticles ◽  
Wide Ph Range ◽  
Ft Ir ◽  
Ph Range

Highly deacetylated chitosan (CS) reacted with anhydride acetic (Ac2O) to produce chitosan with various degree of deacetylation (DDA) depending on the CS/Ac2O ratios. The structure of products was characterized by FT-IR, 1H NMR, 13C NMR, and the molecular weight was identified by GPC. The DDA of products decreases as the CS/Ac2O ratio increases. The products with less than 80 % DDA were soluble in water with a wide pH range. The water-soluble chitosan can be used in many biomedical applications such as manufacturing drug delivery systems or functionalized iron oxide nanoparticles.

Hydrothermally treated chitosan spontaneously forms water-soluble spherical particles stable at a wide pH range

2016 ◽  
Vol 65 (15) ◽  
pp. 751-758 ◽  
Author(s):  
Srijita Basumallick ◽  
Maria Gabriela Nogueira Campos ◽  
David Richardson ◽  
Andre Gesquiere ◽  
Swadeshmukul Santra
Keyword(s):  
Water Soluble ◽  
Spherical Particles ◽  
Wide Ph Range ◽  
Ph Range

Receptors for sulfate that function across a wide pH range in mixed aqueous–DMSO media

2019 ◽  
Vol 55 (82) ◽  
pp. 12312-12315 ◽  
Author(s):  
Lei Qin ◽  
James R. Wright ◽  
Jakob D. E. Lane ◽  
Stuart N. Berry ◽  
Robert B. P. Elmes ◽  
...  
Keyword(s):  
Water Soluble ◽  
Aqueous Dmso ◽  
Wide Ph Range ◽  
Ph Range

Water soluble macrocyclic squaramides bind selectively to sulfate in aqueous–DMSO mixtures across a pH range from 3.2–14.

Labeling Cells with Silver/Dendrimer Nanocomposites

2004 ◽  
Vol 845 ◽  
Author(s):  
Wojciech Lesniak ◽  
Xiangyang Shi ◽  
Anna Bielinska ◽  
Katarzyna Janczak ◽  
Kai Sun ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Uv Light ◽  
Toxicity Testing ◽  
Water Soluble ◽  
Cell Labeling ◽  
Single Particles ◽  
Experimental Conditions ◽  
Silver Nanocomposite ◽  
Positively Charged

ABSTRACTWe have developed water-soluble, biocompatible, fluorescent, and photostable silver/dendrimer nanocomposites that have a potential to be used for in vitro cell labeling. A PAMAM_E5.NH2 dendrimer was used as a template to prepare first a silver-dendrimer complex in an aqueous solution at biologic pH=7.4. Conversion into nanocomposite was achieved by irradiating the solution of the [(Ag+)25-PAMAM_E5.NH2] complex by UV light to reduce the bound Ag+ to zero-valent Ag0 atoms, which were simultaneously trapped in the dendrimer network. Results indicate that the {(Ag0)25-PAMAM_E5.NH2} silver/dendrimer nanocomposite forms positively charged single particles of 4–5 nm under the experimental conditions used. The dendrimer nanocomposite proved to be fluorescent. Toxicity testing of {(Ag0)25-PAMAM_E5.NH2} nanocomposite revealed a behavior similar to the template dendrimer. Intracellular internalization of the silver nanocomposite and cell labeling capabilities was confirmed by confocal microscopy.

Water-soluble gold nanoclusters with pH-dependent fluorescence and high colloidal stability over a wide pH range via co-reduction of glutathione and citrate

RSC Advances ◽  
2014 ◽  
Vol 4 (43) ◽  
pp. 22651-22659 ◽  
Author(s):  
Wenchao Ding ◽  
Yong Liu ◽  
Yijing Li ◽  
Qiurong Shi ◽  
Houshen Li ◽  
...  
Keyword(s):  
Fluorescence Intensity ◽  
Colloidal Stability ◽  
Gold Nanoclusters ◽  
Water Soluble ◽  
Simple Strategy ◽  
Wide Ph Range ◽  
Ph Dependent ◽  
Ph Range ◽  
Co Reduction

We present a simple strategy for synthesis of water-soluble, monodisperse, highly fluorescent gold nanoclusters (Au NCs) with sizes of 1.8 nm by co-reduction of glutathione and citrate for 24 h at 50 °C. The fluorescence intensity of the GS/C–Au NCs obtained is pH-dependent and can be reversibly adjusted in the pH range from 4.1 to 8.6.

scholarly journals Novel Enzyme-Free Multifunctional Bentonite/Polypyrrole/Silver Nanocomposite Sensor for Hydrogen Peroxide Detection over a Wide pH Range

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4442 ◽  
Author(s):  
Khouloud Jlassi ◽  
Mostafa H. Sliem ◽  
Kamel Eid ◽  
Igor Krupa ◽  
Mohamed M. Chehimi ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ag Nanoparticles ◽  
Rational Design ◽  
Uv Light ◽  
Low Cost ◽  
Current Response ◽  
Ag Nps ◽  
Hydrogen Peroxide Detection ◽  
Wide Ph Range ◽  
Ph Range

Precise designs of low-cost and efficient catalysts for the detection of hydrogen peroxide (H2O2) over wide ranges of pH are important in various environmental applications. Herein, a versatile and ecofriendly approach is presented for the rational design of ternary bentonite-silylpropyl-polypyrrole/silver nanoarchitectures (denoted as BP-PS-PPy/Ag) via the in-situ photo polymerization of pyrrole with salinized bentonite (BP-PS) in the presence of silver nitrate. The Pyrrolyl-functionalized silane (PS) is used as a coupling agent for tailoring the formation of highly exfoliated BP-PS-PPy sheet-like nanostructures ornamented with monodispersed Ag nanoparticles (NPs). Taking advantage of the combination between the unique physicochemical properties of BP-PS-PPy and the outstanding catalytic merits of Ag nanoparticles (NPs), the as-synthesized BP-PS-PPy/Ag shows a superior electrocatalytic reduction and high-detection activity towards H2O2 under different pH conditions (from 3 to 10). Intriguingly, the UV-light irradiation significantly enhances the electroreduction activity of H2O2 substantially, compared with the dark conditions, due to the high photoelectric response properties of Ag NPs. Moreover, BP-PS-PPy/Ag achived a quick current response with a detection limit at 1 μM within only 1 s. Our present approach is green, facile, scalable and renewable.

Synthesis and Self-Assembled Film Fabricated from Water-Soluble Poly(P-phenylene vinylene) and Fullerene Derivative

2005 ◽  
Vol 153 (1-3) ◽  
pp. 317-320 ◽  
Author(s):  
Fushen Lu ◽  
Yuliang Li ◽  
Huibiao Liu ◽  
Junpeng Zhuang ◽  
Liangbing Gan ◽  
...  
Keyword(s):  
Water Soluble ◽  
Fullerene Derivative ◽  
Phenylene Vinylene ◽  
Self Assembled ◽  
Soluble Poly

scholarly journals Self-assembled multilayers and photoluminescence properties of a new water-soluble poly(para-phenylene)

1998 ◽  
Author(s):  
X. Shi ◽  
D.Q. Li ◽  
M. Luett ◽  
M.R. Fitzsimmons ◽  
G.P. Van Patten
Keyword(s):  
Water Soluble ◽  
Photoluminescence Properties ◽  
Self Assembled ◽  
Soluble Poly
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