The aggregation of thionine and methylene blue dye in smectite dispersion

Czı́merová, Adriana; Bujdák, Juraj; Gáplovský, Anton

doi:10.1016/j.colsurfa.2004.05.002

Cited by 50 publications

(28 citation statements)

References 34 publications

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“…Additionally, light-scattering measurements are performed for WS-TDI dodecyl (data not shown) and reveal the presence of small particles in water, typically several hundreds of nanometers in size. These observations strongly indi- cate the presence of H-aggregates for WS-TDI dodecyl in water, as already reported for WS-TDI and other fluorophores with large and rigid p-electron systems; [17][18][19][20] this phenomenon of aggregation is due to the strong inter-molecular interaction between the hydrophobic dye molecules in polar solvents such as water and is obviously not hindered by the alkyl chain in WS-TDI dodecyl.…”

Section: Absorption and Fluorescence Spectrasupporting

confidence: 58%

Photophysics of New Water‐Soluble Terrylenediimide Derivatives and Applications in Biology

et al. 2009

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The photophysical properties of three new water-soluble terrylenediimide (WS-TDI) derivatives are investigated and their utilization in biological experiments is demonstrated. Each of these dyes can be excited in the far red region of the visible spectrum, making them good candidates for in-vivo studies. Single-molecule techniques characterize their photophysics that is, the number of emitted photons, blinking characteristics and survival times until photobleaching takes place. All three dyes exhibit bright fluorescence, as well as an extremely high resistance against photodegradation compared to other well-known fluorophores. Due to their different characteristics the three new WS-TDI derivatives are suitable for specialized biological applications. WS-TDI dodecyl forms non-fluorescent aggregates in water which can be disrupted in a hydrophobic environment leading to a monomeric fluorescent form. Due to its high lipophilicity WS-TDI dodecyl anchors efficiently in lipid bilayers with its alkyl chain and hence can be ideally used to image membranes and membrane-containing compartments in living cells. In contrast, the positively charged WS-TDI pyridoxy is a new type of chromophore in the WS-TDI family. It is fully solubilized in water forming fluorescent monomers and is successfully used to label the envelope of herpes simplex viruses. Finally, it is shown that a WS-TDI derivative functionalized with N-hydroxysuccinimide ester moiety (WS-TDI/NHS ester) provides a versatile reactive dye molecule for the specific labelling of amino groups in biomolecules such as DNA.

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Section: Absorption and Fluorescence Spectrasupporting

confidence: 58%

Photophysics of New Water‐Soluble Terrylenediimide Derivatives and Applications in Biology

et al. 2009

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“…Although activated carbons have been most widely used for the adsorption of dyes (Rao and Ashutosh 1994;Pelekani and Snoeyink 2001;Lorenc-Grabowska and Gryglewicz 2007), clay minerals have been increasingly gaining attention because they are cheaper than activated carbons and they usually have chemical and mechanical stability, high surface area and structural properties. Many workers have employed clay minerals such as bentonite (Tahir and Rauf 2006;Hu et al 2006), montmorillonite (Wang et al 2004), smectite (Ogawa et al 1996;Czímerová et al 2004), kaolinite (Harris et al 2001), sepiolite (Alkan et al 2004(Alkan et al , 2005, and zeolite (Armagan et al 2004), etc. for removing the dyes from wastewater.…”

Section: Introductionmentioning

confidence: 99%

Adsorption study for removal of Congo red anionic dye using organo-attapulgite

2009

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The organo-attapulgite was prepared using hexadecyltrimethylammonium bromide (HTMAB) with equation equivalent ratio of HTMAB to CEC of attapulgite added and then used as adsorbent for the removal of Congo red (CR) anionic dye from aqueous solution. Adsorbent characterizations were investigated using infrared spectroscopy and X-ray diffraction. The effects of contact time, temperature, pH and initial dye concentration on organo-attapulgite adsorption for CR were investigated. The results show that the amount adsorbed of CR on the organo-attapulgite increase with increasing dye concentration, temperature, and by decreasing pH. The adsorption kinetics was studied with the pseudo-first-order, pseudo-second-order and intraparticle diffusion models, and the rate constants were evaluated. It was found that the adsorption mechanisms in the dye/organo-attapulgite system follow pseudo-second-order kinetics with a significant contribution of film diffusion. Equilibrium data fitted perfectly with Langmuir isotherm model compared to Freundlich isotherm model, and the maximum adsorption capacity was 189.39 mg g −1 for the adsorbent. Kinetic and desorption studies both suggest that chemisorption should be the major mode of CR removal by the organo-attapulgite. The results indicate that HTMABmodified attapulgite could be employed as low-cost material for the removal of Congo red anionic dye from wastewater.

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“…Oriented films of layered silicates, clay minerals of a smectite group FHT, KF and LAP (Czímerová et al, 2004) were prepared by a spin-coating method using 25 mg/5 ml aqueous suspensions of layered silicates on a fused silica substrate. The fused silica slides were transparent in a UV-VIS range at the wavelengths above 200 nm.…”

Section: Experimental and Discussionmentioning

confidence: 99%

Spectral study on the molecular orientation of a tetracationic porphyrin dye on the surface of layered silicates

et al. 2007

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Abstract:Tetracationic porphyrin dyes TMPyP and ZnPyP were intercalated into hydrophobized layered silicate films of three smectites. The smectites represented the layered silicate specimens of high (Fluorohectorite, Corning; FHT), medium (Kunipia F montmorillonite; KF) and low layer charge (Laponite, Laporte; LAP). The molecular orientations of the dye cations were studied by means of linearly-polarized ultraviolet-visible (UV-VIS) spectroscopy. The spectral analysis and consequent calculations of tilting angles of the transition moments at the wavelengths of Soret band transitions were in the range of 25• -35• . The determined angles indicated molecular orientation of the dye cations being almost parallel to the surface of the silicates. Slightly higher values (above 35 • ), determined for a FHT film, indicated either a slightly tilted orientation of the dye cations or the change of molecular comformation after the intercalation of the dye.

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The aggregation of thionine and methylene blue dye in smectite dispersion

Cited by 50 publications

References 34 publications

Photophysics of New Water‐Soluble Terrylenediimide Derivatives and Applications in Biology

Photophysics of New Water‐Soluble Terrylenediimide Derivatives and Applications in Biology

Adsorption study for removal of Congo red anionic dye using organo-attapulgite

Spectral study on the molecular orientation of a tetracationic porphyrin dye on the surface of layered silicates

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