scholarly journals Selective Separation of Scheelite from Calcite by Self-Assembly of H2SiO3 Polymer Using Al3+ in Pb-BHA Flotation

Minerals ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 43 ◽  
Author(s):  
Zhao Wei ◽  
Yuehua Hu ◽  
Haisheng Han ◽  
Wei Sun ◽  
Ruolin Wang ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Sodium Silicate ◽  
Self Assembly ◽  
Aluminum Sulfate ◽  
Selective Separation ◽  
Chemical Analyses ◽  
Mineral Surface ◽  
Optimum Ratio ◽  
Benzohydroxamic Acid ◽  
Lead Complex

The flotation separation of scheelite from calcite is problematic, where sodium silicate modified by polyvalent metal ions has shown some advantages for selective depression. In this study, an Al-Na2SiO3 polymer was used as the depressant for the flotation separation of scheelite from calcite using a lead complex of benzohydroxamic acid (Pb-BHA) as the collector. Furthermore, a number of measurements were conducted to investigate the structure of the Al-Na2SiO3 polymer and its adsorption behavior with Pb-BHA complexes on the mineral surface. Flotation experiments indicated that the Al-Na2SiO3 polymer shows good selectivity for the flotation separation of scheelite from calcite at pH 8, where the optimum ratio of sodium silicate to aluminum sulfate was 2:1. Fourier-Transform Infrared (FTIR) and solution chemical analyses revealed that aluminum hydroxide complexes and the hydroxy moiety of silicic acid are able to self-assemble via condensation affording an Al-Na2SiO3 polymer, i.e., a composite aluminosilicate polymer. The zeta potential measurements and adsorption capacity measurements indicated that, upon adsorption of the Al-Na2SiO3 polymer and Pb-BHA complexes on the mineral surface, the Al-Na2SiO3 polymer had less influence on the adsorption of Pb-BHA complexes on the scheelite surface, while the opposite was true for calcite. Therefore, more Pb-BHA complexes and fewer Al-Na2SiO3 polymers were deposited on the scheelite surface, while fewer Pb-BHA complexes and more Al-Na2SiO3 polymers were adsorbed on the calcite surface. The selective separation of scheelite from calcite was attributed to the cooperative selectivity of the Pb-BHA complexes and Al-Na2SiO3 polymer.

Investigation on the behavior of collagen self-assembly in vitro via adding sodium silicate

2018 ◽  
Vol 115 ◽  
pp. 635-642 ◽  
Author(s):  
Lirui Shen ◽  
Honghong Bu ◽  
Huan Yang ◽  
Wentao Liu ◽  
Guoying Li
Keyword(s):  
Sodium Silicate ◽  
Self Assembly

Formation of morphologically confined nanospaces via self-assembly of graphene and nanospheres for selective separation of lithium

2018 ◽  
Vol 6 (39) ◽  
pp. 18859-18864 ◽  
Author(s):  
Yan Zhao ◽  
Chen Zhou ◽  
Jiaqian Wang ◽  
Huawen Liu ◽  
Yanqing Xu ◽  
...  
Keyword(s):  
Electric Field ◽  
Self Assembly ◽  
Saline Lakes ◽  
Selective Separation ◽  
Assembly Process ◽  
Polystyrene Nanospheres

A novel organic–inorganic multilayer framework membrane was constructed by using graphene and sulfonated amino-polystyrene nanospheres (rGO@SAPS) through a chemical self-assembly process for selective separation of Li+ from saline lakes under an electric field.

scholarly journals Self-Assembly of a Carboxyl-Functionalized BODIPY Dye via Hydrogen Bonding

Crystals ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 436 ◽  
Author(s):  
Beatriz Matarranz ◽  
Angel Sampedro ◽  
Constantin G. Daniliuc ◽  
Gustavo Fernández
Keyword(s):  
Hydrogen Bonding ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Self Assembly ◽  
Acid Group ◽  
Carboxyl Groups ◽  
X Ray ◽  
Ftir Studies ◽  
Meso Position ◽  
Assembly Behavior

We report the synthesis, characterization, and self-assembly behavior of a 4,4-Difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) dye functionalized at the meso-position with a butyric acid group. Various spectroscopic investigations (UV-Vis, emission, and Fourier-transform infrared spectroscopy (FTIR) studies) supported by X-ray analysis revealed the formation of self-assembled structures in the solid state with translationally stacked BODIPY units driven by hydrogen bonding between the carboxyl groups.

scholarly journals Self-assembly of Fibres in Alkylcarboxylate—Sodium Silicate Systems

2002 ◽  
Vol 20 (4) ◽  
pp. 433-440
Author(s):  
A.S. Kovalenko ◽  
N.A. Yaroshenko ◽  
V.V. Strelko ◽  
V.G. Ilyin
Keyword(s):  
Sodium Silicate ◽  
Self Assembly ◽  
Surfactant Molecule ◽  
Metal Salts ◽  
Alkali Metal Salts ◽  
Continuous Formation ◽  
Assembly Mechanism ◽  
Minimal Thickness ◽  
Silicate Surface ◽  
Single Fibres

Fibres of macroscopic size (up to 5 cm in length) formed spontaneously in initially homogeneous systems containing alkali metal salts of saturated n-alkylcarboxylic acids and sodium silicate. After drying, these fibres resembled wool or down, with some being in the form of dense strands which laminated into single fibres with time. The minimal thickness of these single fibres was ca. 0.5 mm and, since a dense parallel cluster contained ca. 34 000 micellar strands, the thickness of each fibre plus associated silicate surface layer amounted to ca. 27 Å. It was suggested that the key feature of the self-assembly mechanism is the weak interaction between a surfactant molecule and a silicate leading to the continuous formation of microscopic sized fibres.

scholarly journals Fourier transform infrared conformational investigation of type I collagen aged by in vitro induced dehydration and non-enzymatic glycation treatments

2017 ◽  
Vol 90 (1) ◽  
Author(s):  
Maria Grazia Bridelli ◽  
Chiaramaria Stani ◽  
Roberta Bedotti
Keyword(s):  
Fourier Transform ◽  
Protein Structure ◽  
Conformational Changes ◽  
Self Assembly ◽  
Type I Collagen ◽  
Protein Secondary Structure ◽  
Fourier Transform Infrared ◽  
Type I ◽  
Absorption Bands

The two main ageing-inducing events in the collagenous tissues are the water loss and the formation of intermolecular crosslinks based on the reaction of collagen with matrix carbohydrates, following a mechanism known as non-enzymatic-glycation. With the aim to mimic the two deleterious processes for the protein structure, rat-tail collagen was submitted to hydration changes and allowed to interact with two sugars characterized by different reducing properties, D-glucose and D-ribose. Fourier transform infrared (FTIR) spectroscopy was employed to investigate the conformational changes induced in the protein by the two treatments by analyzing the subsequent spectra modifications. FTIR spectra monitored: i) the amplitude and position changes of the two characteristic absorption bands OH stretching and Amide I, in dependence on the humidity level: a significant hysteresis effect in the ν(OH) band (ν~3400 cm–1) amplitude of the protein dehydrated and then rehydrated to the initial relative humidity (aw=0.92- 0.06) may be related to the enhancement of the β-sheet fraction in the protein structure as revealed by the parallel modification in the Amide I band (ν~1650 cm–1); ii) the area of the carbohydrate double band peaking at 1080 cm–1 and 1031 cm–1, associated to the accumulation of the glycation products, depending on the sugar concentration and incubation time. The association of both sugars to collagen only minimally affects the protein secondary structure as revealed by Amide I band Gaussian analysis. The whole set of results suggests hints to hypothesize a self-assembly model for collagen molecules induced by ageing.

scholarly journals Mineral Surface Chemistry and Nanoparticle-aggregation Control Membrane Self-Assembly

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Nita Sahai ◽  
Hussein Kaddour ◽  
Punam Dalai ◽  
Ziqiu Wang ◽  
Garrett Bass ◽  
...  
Keyword(s):  
Surface Chemistry ◽  
Self Assembly ◽  
Mineral Surface ◽  
Nanoparticle Aggregation ◽  
Aggregation Control
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