Preparation of graphene/poly(2-hydroxyethyl acrylate) nanohybrid materials via an ambient temperature “grafting-from” strategy

2015 ◽  
Vol 6 (2) ◽  
pp. 311-321 ◽  
Author(s):  
Zhanzhan Liu ◽  
Shaojia Zhu ◽  
Yongjun Li ◽  
Yongsheng Li ◽  
Ping Shi ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Organic Solvents ◽  
Hybrid Material ◽  
Polymer Brushes ◽  
Graphene Sheets ◽  
Nanohybrid Materials ◽  
Grafting From

PHEA polymer brushes were grownin situfrom the surface of graphene sheetsviaSET-LRP through a “grafting-from” strategy at ambient temperature to afford the PHEA/graphene hybrid material with excellent dispersibility in organic solvents.

The in situ “grafting from” approach for the synthesis of polymer brushes on upconversion nanoparticles via NIR-mediated RAFT polymerization

2021 ◽  
Author(s):  
Lingjuan Hu ◽  
Qianqian Hao ◽  
Linan Wang ◽  
Zhe Cui ◽  
Peng Fu ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Polymer Brushes ◽  
Raft Polymerization ◽  
Surface Growth ◽  
Upconversion Nanoparticles ◽  
Grafting From

Through NIR-mediated RAFT polymerization, surface growth of polymer brushes on UCNPs was realized based on an efficient in situ ligand exchange.

SEM of non-coated hepatocellular cytoskeleton of perfused livers

1984 ◽  
Vol 42 ◽  
pp. 306-307
Author(s):  
S.W. French ◽  
N.C. Benson ◽  
C. Davis-Scibienski
Keyword(s):  
Ambient Temperature ◽  
Critical Point ◽  
Protease Inhibitors ◽  
Metal Deposition ◽  
Heat Damage ◽  
Detergent Extraction ◽  
Cytoskeletal Elements ◽  
Triton X ◽  
Excised Tissue

Previous SEM studies of liver cytoskeletal elements have encountered technical difficulties such as variable metal coating and heat damage which occurs during metal deposition. The majority of studies involving evaluation of the cell cytoskeleton have been limited to cells which could be isolated, maintained in culture as a monolayer and thus easily extracted. Detergent extraction of excised tissue by immersion has often been unsatisfactory beyond the depth of several cells. These disadvantages have been avoided in the present study. Whole C3H mouse livers were perfused in situ with 0.5% Triton X-100 in a modified Jahn's buffer including protease inhibitors. Perfusion was continued for 1 to 2 hours at ambient temperature. The liver was then perfused with a 2% buffered gluteraldehyde solution. Liver samples including spontaneous tumors were then maintained in buffered gluteraldehyde for 2 hours. Samples were processed for SEM and TEM using the modified thicarbohydrazide procedure of Malich and Wilson, cryofractured, and critical point dried (CPD). Some samples were mechanically fractured after CPD.

Nanostructured Polymer Brushes With Reversibly Changing Properties

2002 ◽  
Vol 727 ◽  
Author(s):  
Denys Usov ◽  
Manfred Stamm ◽  
Sergiy Minko ◽  
Christian Froeck ◽  
Andreas Scholl ◽  
...  
Keyword(s):  
Polymer Brushes ◽  
Phase Segregation ◽  
Water Contact ◽  
Angle Measurements ◽  
Nanostructured Polymer ◽  
Contact Angle Measurements ◽  
Vertical Segregation ◽  
Oxygen Plasma Etching ◽  
Grafting From ◽  
Photoemission Electron

AbstractWe investigated the interplay between different mechanisms of the lateral and vertical segregation in the synthesized via “grafting from” approach symmetric A/B (where A and B are poly(styrene-co-2,3,4,5,6-pentafluorostyrene) and poly(methylmethacrylate), respectively) polymer brushes upon exposure to different solvents. We used X-ray photoemission electron spectroscopy and microscopy (X-PEEM), AFM, water contact angle measurements, and oxygen plasma etching to study morphology of the brushes. The ripple morphology after toluene (nonselective solvent) revealed elongated lamellar-like domains of A and B polymers alternating across the surface. The dimple-A morphology consisting of round clusters of the polymer A was observed after acetone (selective solvent for B). The top layer was enriched with the polymer B showing that the brush underwent both the lateral and vertical phase segregation. A qualitative agreement with predictions of SCF theory was found.

scholarly journals Back Cover: In Situ Observation of Non‐Classical 2‐Norbornyl Cation in Confined Zeolites at Ambient Temperature (Angew. Chem. Int. Ed. 9/2021)

2021 ◽  
Vol 60 (9) ◽  
pp. 4952-4952
Author(s):  
Xiaomin Tang ◽  
Wei Chen ◽  
Xianfeng Yi ◽  
Zhiqiang Liu ◽  
Yao Xiao ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
In Situ Observation ◽  
Back Cover

Toxicity of organic solvents used in situ in microbial fermentation

1995 ◽  
Vol 9 (4) ◽  
pp. 247-252 ◽  
Author(s):  
Ján Marták ◽  
Michal Rosenberg ◽  
Štefan Schlosser ◽  
L'udmila Krištofíková
Keyword(s):  
Organic Solvents ◽  
Microbial Fermentation

Novel environment friendly olive pomace-cyclohexanone formaldehyde composite resin

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Selda Sert ◽  
Nilgün Kızılcan
Keyword(s):  
Organic Solvents ◽  
Condensation Reaction ◽  
Agricultural Waste ◽  
Composite Resins ◽  
Formaldehyde Resin ◽  
Olive Pomace ◽  
Adhesion Properties ◽  
Content Type ◽  
Naoh Solution

Purpose Cyclohexanone-formaldehyde resin (CFR) was in situ modified with olive pomace (OP) in the presence of sodium hydroxide. The purpose of this study is to produce eco-friendly OP modified cyclohexanone composite resins (OPCFCR) with a one-step method that has higher condensation reaction temperature than CFR. The water absorption properties, gloss value and cross-cut adhesion properties of the product were investigated. Design/methodology/approach Cyclohexanone, formalin (37% aqueous solution) and tannin were mixed and 20% aqueous NaOH solution was added to produce the resin. OP has environmentally friendly bio-based lignin, cellulose and phenolic compounds and the OP structure has been incorporated into the structure of the CFR resin during the in situ modification, such as resole resin and polysaccharide. The weights of pomace were used as 5% and 10% of the weight of cyclohexanone in cyclohexanone-formaldehyde composite resins, respectively. Findings There is an improvement in the properties of the OPCFCR produced from an agricultural waste that is very abundant in Gulf of Edremit region of Balikesir. The OPCFCRs were soluble in common organic solvents. The product OPCFCR has a dark red-brown color. Research limitations/implications The reaction mixture must be stirred continuously. Subsequently, 37% formalin was added dropwise in total while refluxing. The amount of aqueous NaOH solution is limited as the formed resin may become insoluble in common organic solvents. At the end of the reaction, a water-insoluble resin is obtained. Practical implications This study provides the application of ketonic resins. The OPCFCR containing phenolic groups may also promote the adhesive strength of a coating. Social implications These resins may be used for the preparation of adhesive. OP, with a large amount of catechol groups, was considered for reducing the formaldehyde emission level on the adhesive system. Originality/value OPCFCR has been synthesized in the presence of a base catalyst. Environmental and ecological concerns have increased the attention paid by chemical industry to renewable raw materials.

Facile preparation of asymmetric phthalocyanine/multi-walled carbon nanotube hybrid material by in situ click chemistry

2018 ◽  
Vol 29 (24) ◽  
pp. 21078-21087 ◽  
Author(s):  
Zhenglong Yang ◽  
Jing Yu ◽  
Kangyu Fu ◽  
Fengfeng Tang
Keyword(s):  
Carbon Nanotube ◽  
Click Chemistry ◽  
Hybrid Material ◽  
Multi Walled Carbon Nanotube ◽  
Facile Preparation

In Situ Synthesis of Silver Nanospheres, Nanocubes, and Nanowires over Boron-Doped Graphene Sheets for Surface-Enhanced Raman Scattering Application and Enzyme-Free Detection of Hydrogen Peroxide

Langmuir ◽  
2018 ◽  
Vol 34 (45) ◽  
pp. 13603-13614 ◽  
Author(s):  
Anju K. Nair ◽  
Kala Moolepparambil Sukumaran Nair ◽  
Sabu Thomas ◽  
Didier Rouxel ◽  
Subbiah Alwarappan ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Raman Scattering ◽  
In Situ Synthesis ◽  
Graphene Sheets ◽  
Boron Doped ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Doped Graphene ◽  
Enhanced Raman Scattering

A novel cellulose–manganese oxide hybrid material by in situ soft chemical synthesis and its application for the removal of Pb(II) from water

2010 ◽  
Vol 181 (1-3) ◽  
pp. 986-995 ◽  
Author(s):  
Shihabudheen M. Maliyekkal ◽  
Kinattukara P. Lisha ◽  
T. Pradeep
Keyword(s):  
Chemical Synthesis ◽  
Manganese Oxide ◽  
Hybrid Material ◽  
Soft Chemical Synthesis

scholarly journals Synthesis of Poly(ester-graft-methyl methacrylate) on a Macroinitiator with Lateral Sulfonyl Chloride Groups by Atom Transfer Radical Polymerization

2021 ◽  
Vol 63 (4) ◽  
pp. 385-391
Author(s):  
T. K. Meleshko ◽  
A. B. Razina ◽  
N. N. Bogorad ◽  
M. P. Kurlykin ◽  
A. V. Kashina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Methyl Methacrylate ◽  
Atom Transfer Radical Polymerization ◽  
Radical Polymerization ◽  
Polymer Brushes ◽  
Sulfonyl Chloride ◽  
Physical And Mechanical Properties ◽  
Degree Of Polymerization ◽  
Side Chains ◽  
Grafting From

Abstract New polymer brushes with an ester backbone and poly(methyl methacrylate) side chains are synthesized by polycondensation and polymerization methods. The initiating groups are sulfonyl chloride groups laterally attached to the polyester chain. PMMA side chains are grafted by the ATRP method according to the “grafting from” multicenter macroinitiator strategy. The conditions for the polymerization processes in a controlled mode are selected, and the ways of targeted regulation of the degree of polymerization of methacrylate side chains are determined. Using the synthesized copolymers self-supporting films are obtained, and their physical and mechanical properties are studied.

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