- AGENT FOR DYEING HAIR, CONTAINING AT LEAST ONE ORGANIC SILICON COMPOUND, A COLORING COMPOUND AND A FILM-FORMING, HYDROPHILIC POLYMER
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The subject of the present disclosure is a composition for coloring keratinous material, in particular human hair, containing in a cosmetic carrier (a) at least one organic silicon compound selected from silanes having one, two or three silicon atoms, said organic silicon compound further comprising one or more basic chemical functions and one or more hydroxyl groups or hydrolysable groups per molecule,(b) at least one colorant compound from the group of pigments and/or direct dyes, and(c) at least one film-forming hydrophilic polymer.
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- Graphene oxide coated quartz sand as a high performance adsorption material in the application of water treatment
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In order to increase the water treatment performance, the quartz sand filter medium was improved by surface modification using a 3-aminopropyltriethoxy silane coupling agent (KH550), then GO was grafted to the surface of the sand though the chemical reaction between the functional groups. The interfacial interactions between the quartz sand surface and GO was studied. Fourier-transform infrared (FTIR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses showed that the GO binds strongly to the quartz sand surface. Scanning electronic microscopy (SEM) observation showed that a thin GO layer was formed on the surface of the modified quartz sand. The modified sand was used as a sorbent for the removal of turbidity, organic matter, Cd(ii) and Pb(ii) ions from large volumes of aqueous solutions. The results indicate that the GO plays an important role in improving the water treatment performance of a quartz sand filter.
- Hou, Wenjun,Zhang, Yimei,Liu, Tong,Lu, Hongwei,He, Li
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p. 8037 - 8043
(2015/02/19)
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- Non-formaldehyde, crease resistant agent for cotton fabrics based on an organic-inorganic hybrid material
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1,2,3,4-Butanetetracarboxylic acid (BTCA) was reacted with (3-aminopropyl)triethoxysilane (APTES) to a poly(amic)acid (PAA). The molar ratios of BTCA and APTES were 1/1 (B/A-1/1), 1/2 (B/A-1/2), 1/3 (B/A-1/3), and 1/4 (B/A-1/4). The as-prepared precursor solution was applied to cotton substrates. After thermal treatment (180°C) the physical-mechanical properties of the cotton samples were tested by means of dry crease recovery angle and tensile strength. For B/A-1/1 treated fabrics a significant improvement of the crease resistance was observed. FT-IR spectra revealed the formation of an imide group and an ester linkage, indicating the cross-linking of the cellulosic material. SEM images showed a smooth surface. As evidenced by TGA data the thermal stability of the cotton samples was not increased. No hydrophobicity could be observed. For B/A-1/3 and (B/A-1/4) modified cotton samples no crease resistant properties were detected. However, enhanced contact angle values were measured. A reaction mechanism for the formation of the ladder-like polysilsesquioxane and the cross-linking reaction is proposed.
- Schramm, Christian,Rinderer, Beate,Tessadri, Richard
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- Insitu X-ray reflectivity studies of molecular and molecular-cluster intercalation within purple membrane films
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It has been recently demonstrated that molecular and molecular cluster guest species can intercalate within lamellar stacks of purple membrane (PM), and be subsequently dried to produce functional bioinorganic nanocomposite films. However, the mechanism for the intercalation process remains to be fully understood. Here we employ surface X-ray scattering to study the intercalation of aminopropyl silicic acid (APS) or aminopropyl-functionalised magnesium phyllosilicate (AMP) molecular clusters into PM films. The composite films are prepared under aqueous conditions by guest infiltration into preformed PM films, or by co-assembly from an aqueous dispersion of PM sheets and guest molecules/clusters. Our results show that addition of an aqueous solution of guest molecules to a dried preformed PM film results in loss of the lamellar phase, and that subsequent air-drying induces re-stacking of the lipid/protein membrane sheets along with retention of a 2-3 nm hydration layer within the inter-lamellar spaces. We propose that this hydration layer is necessary for the intercalation of APS molecules or AMP oligomers into the PM film, and their subsequent condensation and retention as nano-thin inorganic lamellae within the composite mesostructure after drying. Our results indicate that the intercalated nanocomposites prepared from preformed PM films have a higher degree of ordering than those produced by co-assembly. This journal is the Partner Organisations 2014.
- Mohd Kaus, Noor Haida,Collins, Andrew M.,Bikondoa, Oier,Cresswell, Philip T.,Bulpett, Jennifer M.,Briscoe, Wuge H.,Mann, Stephen
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p. 5447 - 5452
(2014/07/07)
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- Electrospun amino-functionalized PDMS as a novel SPME sorbent for the speciation of inorganic and organometallic arsenic species
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Sol-gel based amine-functionalized SPME fibers (PDMS-weak anion exchanger) were prepared and used for direct mode extraction of dimethylarsinic acid (DMA), monomethylarsonic acid (MMA), and arsenate (As(v)) from aqueous solutions followed by HPLC-ICPMS determination. Two different methods of coating were employed: (i) electrospinning and (ii) dip coating. Electrospinning was used for the first time for preparation of sol-gel based SPME fibers and was found to be superior in terms of extracted amount of arsenicals, coating homogeneity, accessibility of amine groups on the surface, and preparation time for a single fiber. Various parameters such as solution pH, extraction time, agitation speed, extraction temperature, and ionic strength were studied. Optimum extraction conditions were determined as pH of 5.0, extraction time of 30 min, agitation speed of 700 rpm, and extraction temperature of 20 °C. Extraction ability of the novel coating decreased by the addition of NaCl as a consequence of the competition between anionic arsenic species and chloride ions for active sites of the weak anion exchanger. This novel sol-gel coating prepared by electrospinning was found to be promising for SPME applications. Vibrational spectroscopy revealed the alignment of PDMS chains by elongational force under electrospinning process. The chain alignment accordingly orients the pendant amino functional groups perpendicular to the fiber surface, which may develop the free active functional groups available to the medium and lead to the enhancement of the extraction performance. Moreover, the proposed coating strategy through electrospinning might be able to break new ground for various applications in analytical chemistry as well as other disciplines. The Royal Society of Chemistry 2013.
- Boyaci, Ezel,Horzum, Nesrin,Cagir, Ali,Demir, Mustafa M.,Eroglu, Ahmet E.
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p. 22261 - 22268
(2013/11/06)
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- Manganese phthalocyanine immobilized on silica gel: Efficient and recyclable catalyst for single-step oxidative esterification of aldehydes with alcohols
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The functionalization of silica gel was carried out using 3-aminopropyltriethoxysilane as a reactive surface modifier followed by covalent grafting of novel tetrakis-(2-methoxy-4-formylphenoxy)phthalocyaninato manganese(III) acetate complex. The resulting inorganic-organic hybrid material was found to be a highly selective and recyclable catalyst for the single-step synthesis of esters. The catalyst was characterized by elemental analysis (CHN), diffuse reflectance UV-visible, 13C CPMAS and 29Si CPMAS NMR spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), BET surface area analysis, energy dispersive X-ray fluorescence (ED-XRF), Fourier-transform infrared (FT-IR) and atomic absorption spectroscopy (AAS) techniques, which demonstrates the covalent grafting of the complex onto functionalized silica gel. The catalytic performance of the novel inorganic-organic hybrid catalyst was evaluated in the direct oxidative esterification of aldehydes with alcohols, at ambient temperature, using hydrogen peroxide as an environment friendly oxidant. The hybrid catalyst presented up to 100% of substrate conversion with high turn-over numbers (TONs), up to 100% of selectivity toward the ester product, and can be recovered and reused for multiple cycles without appreciable loss in its catalytic activity.
- Sharma,Gulati, Shikha
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p. 291 - 303
(2012/10/30)
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- Organofunctional alkoxysilanes in dilute aqueous solution: New accounts on the dynamic structural mutability
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The condensation of alkyltrialkoxysilanes was studied using time-dependent 1H- and 29Si-NMR spectroscopy. The main goal was to correlate the results of these investigations with standard conditions in technical applications of the most commonly used commercial silane adhesion promoters. Thus, experiments with 3-aminopropyltriethoxysilane (DYNASYLAN AMEO), 3-glycidyloxypropyltrimethoxysilane (DYNASYLAN GLYMO) and 3-methacryloxypropyltrimethoxysilane (DYNASYLAN MEMO) were carried out in aqueous solutions at a selected range of concentrations. This investigation reflects a convenient way to determine the total concentration of reactive silanol groups during the course of the reaction. Moreover, the activity of the solution in adhesion promoting processes can be monitored and measured.
- Beari, Fatmir,Brand, Marcus,Jenkner, Peter,Lehnert, Robert,Metternich, Hans Jürgen,Monkiewicz, Jaroslaw,Siesler
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p. 208 - 216
(2007/10/03)
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