Effect of sonication on polymeric membranes

Masselin, Isabelle

doi:10.1016/s0376-7388(00)00534-2

Cited by 155 publications

(61 citation statements)

References 22 publications

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“…Sonication is an effective means of cleaning or disrupting materials adhered to a surface (23,56). Its effectiveness, measured as the amount of material removed from a surface, may give an indirect estimate of surface material-substratum adhesion force.…”

Section: Vol 69 2003 Bacterial Mineralization In Stone Conservationmentioning

confidence: 99%

Conservation of Ornamental Stone by Myxococcus xanthus- Induced Carbonate Biomineralization

Rodríguez-Navarro¹,

Rodríguez-Gallego²,

Chekroun

et al. 2003

Appl Environ Microbiol

462

296

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Increasing environmental pollution in urban areas has been endangering the survival of carbonate stones in monuments and statuary for many decades. Numerous conservation treatments have been applied for the protection and consolidation of these works of art. Most of them, however, either release dangerous gases during curing or show very little efficacy. Bacterially induced carbonate mineralization has been proposed as a novel and environmentally friendly strategy for the conservation of deteriorated ornamental stone. However, the method appeared to display insufficient consolidation and plugging of pores. Here we report that Myxococcus xanthus-induced calcium carbonate precipitation efficiently protects and consolidates porous ornamental limestone. The newly formed carbonate cements calcite grains by depositing on the walls of the pores without plugging them. Sonication tests demonstrate that these new carbonate crystals are strongly attached to the substratum, mostly due to epitaxial growth on preexisting calcite grains. The new crystals are more stress resistant than the calcite grains of the original stone because they are organic-inorganic composites. Variations in the phosphate concentrations of the culture medium lead to changes in local pH and bacterial productivity. These affect the structure of the new cement and the type of precipitated CaCO 3 polymorph (vaterite or calcite). The manipulation of culture medium composition creates new ways of controlling bacterial biomineralization that in the future could be applied to the conservation of ornamental stone.The study of bacterially induced and mediated mineralization is an emerging interdisciplinary research area (see references 6, 28, and 32 for recent reviews on the topic). Bacterially induced precipitation of calcium carbonate, the so-called "carbonatogenesis" (21, 51), has drawn much attention in recent decades because of its numerous implications. These include (i) atmospheric CO 2 fixation through carbonate sediment formation and lithification (22,29,36,48,49,59,65) and dolomite precipitation (76, 93), (ii) solid-phase capture of inorganic contaminants (95), (iii) the production of pathological concretions such as gallstones and kidney stones in humans (41,44,46), and (iv) understanding possible extraterrestrial biological processes like those of Martian carbonate-producing bacteria (58, 88). There is extensive literature on bacterial involvement in carbonate precipitation both in nature and in the laboratory

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Section: Vol 69 2003 Bacterial Mineralization In Stone Conservationmentioning

confidence: 99%

Conservation of Ornamental Stone by Myxococcus xanthus- Induced Carbonate Biomineralization

Rodríguez-Navarro¹,

Rodríguez-Gallego²,

Chekroun

et al. 2003

Appl Environ Microbiol

462

296

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“…At frequency larger than 18 kHz, high intensity sound fields produced a dynamic agitation and shear stresses, which affect the properties, particularly viscosity. 23 To investigate the effect of frequency, runs were performed with the fouled membrane surface facing away from the transducer with different sonication time. Altering ultrasound input to medium frequency changed both of the wave interactions with the fluid and the characteristics of the cavitation bubbles formed.…”

Section: Effect Of Frequencymentioning

confidence: 99%

“…[19][20][21][22] This technology has been extensively used as a method of cleaning materials because of the cavitation phenomenon. 23 It was reported that the permeability enhancement resulted from the acoustic pressure, agitation and micro-current of feed fluid by ultrasound irradiation. Chai et al found that the increase in permeate flux could be ascribed to the increase in bulk mass transfer in the concentration polarisation layer near the membrane.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonically Aided Cross-flow Membrane Filtration for Latex Wastewater

Ahmad¹,

Lah²,

Ismail³

2018

JPS

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“…acoustic irradiation [2][3][4]) or additives (e.g. catalysts, surfactants, blowing agents, etc), which influence the cross-linking processes (e.g.…”

Section: Manuscript Click Here To Download Manuscript: Measurement Ofmentioning

confidence: 99%

Identification of formation stages in a polymeric foam customised by sonication via electrical resistivity measurements

Torres-Sánchez

Corney

2008

J Polym Res

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nucleation, growth, packing, stiffening, solidification) some of which are known to be more sensitive to external inputs than others. Consequently, precise detection of the start and end points of each of the polymerisation stages would enable the fine control of material properties such as porosity.The development of such process control can only be pursued if those sensitive stages can be clearly distinguished during the manufacture process. This paper reports how an electrical resistivity tracking method was used to assess the differences in the foaming processes when ultrasound was irradiated to polymeric melts undergoing foaming. The electrical resistivity tracking method is also appraised with regard to its suitability to accurately identify the formation stages in the foam, as described by other authors. The polymerisation reactions associated with foam formation have distinct stages (i.e. nucleation, growth, packing, stiffening, solidification) some of which are known to be more sensitive to external inputs than others. Consequently, precise detection of the start and end points of each of the polymerisation stages would enable the fine control of material properties such as porosity. The development of such process control can only be pursued if those sensitive stages can be clearly distinguished during the manufacture process. This paper reports how an electrical resistivity tracking method was used to assess the differences in the foaming processes when ultrasound was irradiated to polymeric melts undergoing foaming. The electrical resistivity tracking method is also appraised with regard to its suitability to accurately identify the formation stages in the foam, as described by other authors.

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Effect of sonication on polymeric membranes

Cited by 155 publications

References 22 publications

Conservation of Ornamental Stone by Myxococcus xanthus- Induced Carbonate Biomineralization

Conservation of Ornamental Stone by Myxococcus xanthus- Induced Carbonate Biomineralization

Ultrasonically Aided Cross-flow Membrane Filtration for Latex Wastewater

Identification of formation stages in a polymeric foam customised by sonication via electrical resistivity measurements

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