Rational design of block copolymer self-assemblies in photodynamic therapy

• Maxime Demazeau,
• Laure Gibot,
• Anne-Françoise Mingotaud,
• Patricia Vicendo,
• Clément Roux and
• Barbara Lonetti

Beilstein J. Nanotechnol. 2020, 11, 180–212, doi:10.3762/bjnano.11.15

Preparation of thick silica coatings on carbon fibers with fine-structured silica nanotubes induced by a self-assembly process

• Benjamin Baumgärtner,
• Hendrik Möller,
• Thomas Neumann and
• Dirk Volkmer

Beilstein J. Nanotechnol. 2017, 8, 1145–1155, doi:10.3762/bjnano.8.116

• carbon fibers with a silica shell is presented in this work. By immobilizing linear polyamines on the carbon fiber surface, the high catalytic activity of polyamines in the sol–gel-processing of silica precursors is used to deposit a silica coating directly on the fiber’s surface. The surface

• localization of the catalyst is achieved either by attaching short-chain polyamines (e.g., tetraethylenepentamine) via covalent bonds to the carbon fiber surface or by depositing long-chain polyamines (e.g., linear poly(ethylenimine)) on the carbon fiber by weak non-covalent bonding. The long-chain polyamine

• addition, amines and polyamines can facilitate the silicic acid polycondensation [11][12][13]. A biomimetic system, which employs linear poly(ethylenimine) (LPEI) and was introduced recently by Jin et al., is capable of both catalyzing silicification and directing the silica morphology [14][15][16]. LPEI

Chemoselective silicification of synthetic peptides and polyamines

• Maryna Abacilar,
• Fabian Daus and
• Armin Geyer

Beilstein J. Nanotechnol. 2015, 6, 103–110, doi:10.3762/bjnano.6.10

• present experiments which quantify the additivity, and potential cooperativity of long chain polyamines (LCPAs) and cationic peptides in the silicification process. Keywords: biomineralisation; biosilicification; NMR spectroscopy; polyamines; silaffin; Introduction Modifications of the Stöber method [1

• mixed with a known oligoamine to identify the better precipitator based on the stronger reduction in 1H NMR signal intensity. Results Polyamines and cationic peptides The cell wall of diatoms is a composite material with a high content of organic molecules from various compound classes such as

• consist of two-component mixtures of defined concentration of each individual molecular species. Polyamines and peptides compete for silicic acid in the NMR tube. Further parameters such as the excess of silicic acid, the pH value, and phosphate concentration are selected by us based on former

Electrostatic interplay: The interaction triangle of polyamines, silicic acid, and phosphate studied through turbidity measurements, silicomolybdic acid test, and ²⁹Si NMR spectroscopy

• Anne Jantschke,
• Katrin Spinde and
• Eike Brunner

Beilstein J. Nanotechnol. 2014, 5, 2026–2035, doi:10.3762/bjnano.5.211

• Anne Jantschke Katrin Spinde Eike Brunner TU Dresden, Fachrichtung Chemie und Lebensmittelchemie, Bioanalytische Chemie, 01062 Dresden, Germany 10.3762/bjnano.5.211 Abstract The discovery of long-chain polyamines as biomolecules that are tightly associated to biosilica in diatom cell walls has

• synthesis approaches. The present contribution deals with the influence of amines and polyamines upon the initial self-assembly processes taking place during polyamine-mediated silica formation in solution. The influence of phosphate upon these processes is studied. For this purpose, sodium metasilicate

• silica. Keywords: phosphate; self-assembly; silica–polyamine interactions; silicomolybdic acid test; 29Si NMR; turbidity measurements; Introduction Long-chain polyamines (LCPAs) were previously found biomolecules that are tightly associated to the biosilica of various diatom species [1][2][3][4][5

Controlled synthesis and tunable properties of ultrathin silica nanotubes through spontaneous polycondensation on polyamine fibrils

• Jian-Jun Yuan,
• Pei-Xin Zhu,
• Daisuke Noda and
• Ren-Hua Jin

Beilstein J. Nanotechnol. 2013, 4, 793–804, doi:10.3762/bjnano.4.90

• precisely controlled nanopatterns, a hierarchical morphology and organic–inorganic hybrid structures [16][17][18]. It has been demonstrated that the long-chain polyamines (partially combined with proteins) in diatom shells and the silicateins in marine sponges play a vital role in templating the