58160-99-9Relevant articles and documents
Insitu X-ray reflectivity studies of molecular and molecular-cluster intercalation within purple membrane films
Mohd Kaus, Noor Haida,Collins, Andrew M.,Bikondoa, Oier,Cresswell, Philip T.,Bulpett, Jennifer M.,Briscoe, Wuge H.,Mann, Stephen
, p. 5447 - 5452 (2014)
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.
Graphene oxide coated quartz sand as a high performance adsorption material in the application of water treatment
Hou, Wenjun,Zhang, Yimei,Liu, Tong,Lu, Hongwei,He, Li
, p. 8037 - 8043 (2015)
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.
Non-formaldehyde, crease resistant agent for cotton fabrics based on an organic-inorganic hybrid material
Schramm, Christian,Rinderer, Beate,Tessadri, Richard
, p. 81 - 89 (2014)
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.
