The Experts below are selected from a list of 6639 Experts worldwide ranked by ideXlab platform

Eckhard Schollmeyer - One of the best experts on this subject based on the ideXlab platform.

  • surface structuring of synthetic Fibres by uv laser irradiation part iii surface functionality changes resulting from excimer laser irradiation
    Polymer International, 1998
    Co-Authors: Dierk Knittel, Eckhard Schollmeyer
    Abstract:

    The chemical surface composition accompanying UV-laser induced surface structuring of fibrous materials such as poly(ethylene terephthalate) (PETP) is discussed. Only a few real chemical changes have been investigated up to now (formation of carboxylic groups on PETP, formation of C=O bonds on polypropylene). Much more data exist on the formation of yellow layers on the laser-treated samples, consisting of debris derived from the ablation process. Analysis by laser desorption mass spectroscopy (LD-MS) and XPS confirm the composition of those layers as highly carbonaceous. Methods for using LD-MS for Fibre Identification and methods for avoiding debris-layer formation are described together with some surface grafting experiments. In some cases excimer irradiation may be used to remove fabrication agents from polymer surfaces. © 1998 SCI.

Dierk Knittel - One of the best experts on this subject based on the ideXlab platform.

  • surface structuring of synthetic Fibres by uv laser irradiation part iii surface functionality changes resulting from excimer laser irradiation
    Polymer International, 1998
    Co-Authors: Dierk Knittel, Eckhard Schollmeyer
    Abstract:

    The chemical surface composition accompanying UV-laser induced surface structuring of fibrous materials such as poly(ethylene terephthalate) (PETP) is discussed. Only a few real chemical changes have been investigated up to now (formation of carboxylic groups on PETP, formation of C=O bonds on polypropylene). Much more data exist on the formation of yellow layers on the laser-treated samples, consisting of debris derived from the ablation process. Analysis by laser desorption mass spectroscopy (LD-MS) and XPS confirm the composition of those layers as highly carbonaceous. Methods for using LD-MS for Fibre Identification and methods for avoiding debris-layer formation are described together with some surface grafting experiments. In some cases excimer irradiation may be used to remove fabrication agents from polymer surfaces. © 1998 SCI.

Federico Rossetti - One of the best experts on this subject based on the ideXlab platform.

  • asbestos Fibre Identification vs evaluation of asbestos hazard in ophiolitic rock melanges a case study from the ligurian alps italy
    Environmental Earth Sciences, 2014
    Co-Authors: Gianluca Vignaroli, Girolamo Belardi, Federico Rossetti
    Abstract:

    In recent years, the high incidence of harmful health effects through inhalation of airborne asbestos from amphibole-bearing rock melanges has been thoroughly documented. Here, we present a field-based, multi-scale geological approach aimed at illustrating the occurrence of amphibole fibrous mineralisation in an ophiolitic suite from the Ligurian Alps (Italy) and discussing the implication on in situ determination of the asbestos hazard. The rock melange is composed of plurimetre-sized blocks of different lithotypes (metagabbro, serpentinite, chloritoschist) juxtaposed by the meaning of tectonic structures. The geological-structural survey revealed that the fibrous mineralisation is localised in specific structural sites of the rock volume, including veins and schistosity. Both micro-chemical and crystal structure analyses on selected fibrous samples revealed that actinolite Fibres grow in veins within the metagabbro and in chloritoschists, while fibrous tremolite occurs in serpentinite schistosity. The morphological features of these amphibole Fibres have been analysed in TEM images and used for classifying them as “asbestiform” or “non-asbestiform”. The results show that the asbestos hazard determination is not unequivocally identified when different procedures for asbestos Fibre Identification and classification are applied. This may have impact on normatives and regulations in defining environmental hazards due to asbestos occurrence.

  • Asbestos Fibre Identification vs. evaluation of asbestos hazard in ophiolitic rock mélanges, a case study from the Ligurian Alps (Italy)
    'Springer Science and Business Media LLC', 2014
    Co-Authors: Gianluca Vignaroli, Girolamo Belardi, Federico Rossetti
    Abstract:

    In recent years, the high incidence of harmful health effects through inhalation of airborne asbestos from amphibole-bearing rock mélanges has been thoroughly documented. Here, we present a field-based, multi-scale geological approach aimed at illustrating the occurrence of amphibole fibrous mineralisation in an ophiolitic suite from the Ligurian Alps (Italy) and discussing the implication on in situ determination of the asbestos hazard. The rock mélange is composed of plurimetre-sized blocks of different lithotypes (metagabbro, serpentinite, chloritoschist) juxtaposed by the meaning of tectonic structures. The geological-structural survey revealed that the fibrous mineralisation is localised in specific structural sites of the rock volume, including veins and schistosity. Both micro-chemical and crystal structure analyses on selected fibrous samples revealed that actinolite Fibres grow in veins within the metagabbro and in chloritoschists, while fibrous tremolite occurs in serpentinite schistosity. The morphological features of these amphibole Fibres have been analysed in TEM images and used for classifying them as "asbestiform" or "non-asbestiform". The results show that the asbestos hazard determination is not unequivocally identified when different procedures for asbestos Fibre Identification and classification are applied. This may have impact on normatives and regulations in defining environmental hazards due to asbestos occurrence. © 2014 Springer-Verlag Berlin Heidelberg

Gianluca Vignaroli - One of the best experts on this subject based on the ideXlab platform.

  • asbestos Fibre Identification vs evaluation of asbestos hazard in ophiolitic rock melanges a case study from the ligurian alps italy
    Environmental Earth Sciences, 2014
    Co-Authors: Gianluca Vignaroli, Girolamo Belardi, Federico Rossetti
    Abstract:

    In recent years, the high incidence of harmful health effects through inhalation of airborne asbestos from amphibole-bearing rock melanges has been thoroughly documented. Here, we present a field-based, multi-scale geological approach aimed at illustrating the occurrence of amphibole fibrous mineralisation in an ophiolitic suite from the Ligurian Alps (Italy) and discussing the implication on in situ determination of the asbestos hazard. The rock melange is composed of plurimetre-sized blocks of different lithotypes (metagabbro, serpentinite, chloritoschist) juxtaposed by the meaning of tectonic structures. The geological-structural survey revealed that the fibrous mineralisation is localised in specific structural sites of the rock volume, including veins and schistosity. Both micro-chemical and crystal structure analyses on selected fibrous samples revealed that actinolite Fibres grow in veins within the metagabbro and in chloritoschists, while fibrous tremolite occurs in serpentinite schistosity. The morphological features of these amphibole Fibres have been analysed in TEM images and used for classifying them as “asbestiform” or “non-asbestiform”. The results show that the asbestos hazard determination is not unequivocally identified when different procedures for asbestos Fibre Identification and classification are applied. This may have impact on normatives and regulations in defining environmental hazards due to asbestos occurrence.

  • Asbestos Fibre Identification vs. evaluation of asbestos hazard in ophiolitic rock mélanges, a case study from the Ligurian Alps (Italy)
    'Springer Science and Business Media LLC', 2014
    Co-Authors: Gianluca Vignaroli, Girolamo Belardi, Federico Rossetti
    Abstract:

    In recent years, the high incidence of harmful health effects through inhalation of airborne asbestos from amphibole-bearing rock mélanges has been thoroughly documented. Here, we present a field-based, multi-scale geological approach aimed at illustrating the occurrence of amphibole fibrous mineralisation in an ophiolitic suite from the Ligurian Alps (Italy) and discussing the implication on in situ determination of the asbestos hazard. The rock mélange is composed of plurimetre-sized blocks of different lithotypes (metagabbro, serpentinite, chloritoschist) juxtaposed by the meaning of tectonic structures. The geological-structural survey revealed that the fibrous mineralisation is localised in specific structural sites of the rock volume, including veins and schistosity. Both micro-chemical and crystal structure analyses on selected fibrous samples revealed that actinolite Fibres grow in veins within the metagabbro and in chloritoschists, while fibrous tremolite occurs in serpentinite schistosity. The morphological features of these amphibole Fibres have been analysed in TEM images and used for classifying them as "asbestiform" or "non-asbestiform". The results show that the asbestos hazard determination is not unequivocally identified when different procedures for asbestos Fibre Identification and classification are applied. This may have impact on normatives and regulations in defining environmental hazards due to asbestos occurrence. © 2014 Springer-Verlag Berlin Heidelberg

Rossetti Federico - One of the best experts on this subject based on the ideXlab platform.

  • Asbestos Fibre Identification vs. evaluation of asbestos hazard in ophiolitic rock mélanges, a case study from the Ligurian Alps (Italy)
    2014
    Co-Authors: Vignaroli Gianluca*, Ballirano Paolo, Belardi Girolamo, Rossetti Federico
    Abstract:

    In recent years, the high incidence of harmful health effects through inhalation of airborne asbestos from amphibole-bearing rock mélanges has been thoroughly documented. Here, we present a field-based, multi-scale geological approach aimed at illustrating the occurrence of amphibole fibrous mineralisation in an ophiolitic suite from the Ligurian Alps (Italy) and discussing the implication on in situ determination of the asbestos hazard. The rock mélange is composed of plurimetre-sized blocks of different lithotypes (metagabbro, serpentinite, chloritoschist) juxtaposed by the meaning of tectonic structures. The geological-structural survey revealed that the fibrous mineralisation is localised in specific structural sites of the rock volume, including veins and schistosity. Both micro-chemical and crystal structure analyses on selected fibrous samples revealed that actinolite Fibres grow in veins within the metagabbro and in chloritoschists, while fibrous tremolite occurs in serpentinite schistosity. The morphological features of these amphibole Fibres have been analysed in TEM images and used for classifying them as “asbestiform” or “non-asbestiform”. The results show that the asbestos hazard determination is not unequivocally identified when different procedures for asbestos Fibre Identification and classification are applied. This may have impact on normatives and regulations in defining environmental hazards due to asbestos occurrence