Marcella Alesiani - Academia.edu (original) (raw)

Papers by Marcella Alesiani

Research paper thumbnail of The Italian Alzheimer's Disease Neuroimaging Initiative (I-ADNI): Validation of Structural MR Imaging

Journal of Alzheimer's Disease, May 19, 2014

Research paper thumbnail of Factors Affecting OPC Early Age Hydration, Studied by NMR: Fineness, Water to Cement Ratio and Curing Temperature

Research paper thumbnail of Evaluation of stone pore size distribution by means of NMR

Proceedings of the 9th International Congress on Deterioration and Conservation of Stone, 2000

Publisher Summary Nuclear magnetic resonance (NMR) is a technique that exploits magnetic properti... more Publisher Summary Nuclear magnetic resonance (NMR) is a technique that exploits magnetic properties of atomic nuclei with spin quantum number different from zero in an external magnetic field. The energy exchanges between the system and its surroundings is obtained by studying the time length needed for the spin system magnetization to reach the equilibrium value, after a selected perturbation. Therefore, NMR helps in determining the interactions between the pore walls and the hydrogen nuclei of water molecules trapped in the stone porous structure. This further gives information about the chemical-physical properties of the porous matrix. The determination of porous matrix properties in natural porous stones is a very important goal in the Cultural Heritage conservation field. Porous structure of a natural stone depends on its genesis and on its particular history. This chapter describes the application of nondestructive NMR technique to determine pore size distribution function on samples of Carrara marble, Candoglia marble, and travertine. The experiment conducted compares the experimental relaxation data with the data obtained from a simulated porous system. Two marbles and one limestone are compared with samples treated with three different agents: (1) a consolidating, adhesive and binding agent; (2) a hydrophobic protective and preconsolidating agent; and (3) a hydrophobic protective no-film agent. NMR data based analysis is totally non-destructive and is representative of the critical regions where water can be dangerous. It provides useful analysis of the material conservation degree and a pointed conservative treatment. The chapter also provides tables and graphs to illustrate mean values and standard deviations of pore size distribution function in different samples.

Research paper thumbnail of Influence of Cellulosic Additives on Tricalcium Silicate Hydration:  Nuclear Magnetic Resonance Relaxation Time Analysis

The Journal of Physical Chemistry B, 2004

This paper reports a study on the effects of cellulose additives on the setting process of trical... more This paper reports a study on the effects of cellulose additives on the setting process of tricalcium silicate (C 3 S) paste. Cellulose and cellulose derivatives are largely used in the cement industry due to their excellent water carrying capacity that makes these additives essential in the practice of the extrusion processes. However, how they are effective in many processes is not known. We addressed this point investigating the hydration kinetics of C 3 S in the presence of cellulose derivative by thermal analysis and water proton NMR relaxation. Both these methods provided useful information on the mechanisms of the C 3 S curing process involving cellulose. The experimental results clearly show that cellulose additives act as a regulator of water release during the whole hydration process. A quantitative description of this process is reported.

Research paper thumbnail of New openings for porous systems research from intermolecular double-quantum NMR

Solid State Nuclear Magnetic Resonance, 2004

It has been recently recognized that residual intermolecular double-quantum coherences (iDQcs) pr... more It has been recently recognized that residual intermolecular double-quantum coherences (iDQcs) provide a novel contrast mechanism to study heterogeneity in liquid systems. This is of much interest in the field of the physics of matter and biomedicine. Nowadays, literature concerning the behaviour of the iDQc signal originated by highly heterogeneous systems such as fluids in porous media is scarce. In this paper, we report and discuss our principal results about iDQc signal behaviour in confined liquid systems (trabecular bone, travertine, porous standard systems) and also some new results obtained on doped water in glass capillary pipes.

Research paper thumbnail of Diffusion tensor imaging to study anisotropy in a particular porous system: The trabecular bone network

Solid State Nuclear Magnetic Resonance, 2005

During the last decade, considerable effort has been invested into the development of diffusion t... more During the last decade, considerable effort has been invested into the development of diffusion tensor imaging (DTI) mainly used to investigate cerebral morphology. The aim of this paper is to review and to discuss our recent results about high magnetic field DTI application to study spongy bone tissue. Due to its peculiar properties, spongy bone represents a particular porous system sample. Strategies to perform DTI on porous systems and issues linked to DTI outcome interpretation are presented on the basis of our results concerning trabecular bone network characterization.

Research paper thumbnail of Intermolecular double-quantum NMR techniques to probe microstructures on porous media

Magnetic Resonance Imaging, 2003

Research paper thumbnail of NMR study on the early stages of hydration of a porous carbonate stone

Magnetic Resonance Imaging, 2003

Nuclear Magnetic Resonance was employed to obtain information on the pore filling during the abso... more Nuclear Magnetic Resonance was employed to obtain information on the pore filling during the absorption process. A porous carbonate stone, largely employed for buildings and mainly outdoor decorations was studied during water absorption by capillary rise, and filled pores radii were evaluated by comparison between experimental and theoretical parametric magnetization decay curves. Non mono-exponential T 2 allowed spin populations to be split among the associated different relaxation times.

Research paper thumbnail of Characterization of porous media structure by non linear NMR methods

Magnetic Resonance Imaging, 2001

In this paper we discuss the possibility of modifying the multiple spin echoes existing theory, d... more In this paper we discuss the possibility of modifying the multiple spin echoes existing theory, developed for a homogeneous system, to describe also an inhomogeneous system such as a porous medium. We report here the first experimental application of MSE methods to materials like travertine. The ratio A 2 /A 1 from water in travertine presents minima for characteristic values of the delay time , like what was previously observed in the trabecular bone. By a judicious choice of the delay time and of the G gradient strength, the MSE sequence can be made sensitive to a specific length-scale of the sample heterogeneity. Furthermore the MSE image shows a particular new contrast that makes the non linear NMR method very attractive for the assessment of variations of the porous structure in porous systems.

Research paper thumbnail of The influence of superplasticizers on the first steps of tricalcium silicate hydration studied by NMR techniques

Magnetic Resonance Imaging, 2005

The influence of superplasticizer sulfonated naphthalene formaldehyde (SNF) on the hydration proc... more The influence of superplasticizer sulfonated naphthalene formaldehyde (SNF) on the hydration process of tricalcium silicate (C3S) paste was investigated by 1 H nuclear magnetic resonance spin-spin and spin lattice relaxation times. The addition of SNF superplasticizer to C3S paste clearly affects the morphology and growth rates of the hydration products, mainly by increasing the dormant period length, which lasts for several hours more than in conventional C3S hydrated paste, while reducing the acceleration period length. The relaxation data indicated that a pronounced delay occurs in the C3S hardening when sulfonated polymers are added to the makeup water. For all the analyzed samples, prepared with a water-to-C3S ratio of 0.4, the decay of the echo magnetization has been fitted by adopting both a monoexponential and a biexponential relaxation model in order to evaluate the contributions from water in different regimes of hydration.

Research paper thumbnail of NMR relaxation times in treated marble samples

Magnetic Resonance Imaging, 2001

Research paper thumbnail of NMR applications to low porosity carbonate stones

Magnetic Resonance Imaging, 2003

The purpose of this paper is to investigate NMR applications to porous materials widely employed ... more The purpose of this paper is to investigate NMR applications to porous materials widely employed in artistic and historical monuments and largely studied in the Cultural Heritage conservation field. Carrara marble, Candoglia marble and travertine samples were studied and data from relaxation times measurements were compared. Very interesting results from treated samples are reported and explained under the structure related spin lattice relaxation time point of view. Images of Carrara marble aged sample (XIX century), coming from the Florence Cathedral obtained for short absorption time of water by capillary rise and for relatively small thickness slices together show the fluid's spatial distribution within the stone. Comparative images showing untreated sample with the treated ones were obtained suggesting very useful applications for the determination of treatment effectiveness.

Research paper thumbnail of Effects induced in marbles by water-repellent compounds: the NMR contribution

Applied Magnetic Resonance, 2002

The purpose of this paper is to investigate nuclear magnetic resonance (NMR) applications to poro... more The purpose of this paper is to investigate nuclear magnetic resonance (NMR) applications to porous materials widely employed in artistic and historieal monuments and largely studied in the Cultural Heritage conservation field, with the airo of studying structural variations induced in the porous matrix by the application of strengthening and water-repellent agents. Carrara marble and Candoglia marble samples, both in the native state and after treatment, were studied and data from relaxation time measurements were compared. Results collected on treated samples are reported and explained in terms of the relation between spin-lattice relaxation time and the structure of the porous materials. Traditional techniques were employed in addition to NMR analysis on marble samples for the evaluation of the preservative performances of three agents generally employed in the restoration yards. Comparative images showing untreated samples with the treated ones were obtained suggesting very useful applications for the determination of treatment effectiveness.

Research paper thumbnail of 13C CPMAS NMR spectroscopic analysis applied to wood characterization

Applied Magnetic Resonance, 2005

Solid-state nuclear magnetic resonance (NMR) spectroscopic analysis were carried out on recent an... more Solid-state nuclear magnetic resonance (NMR) spectroscopic analysis were carried out on recent and archaeological wood. Cross-polarization-magic-angle spinning ~3C NMR spectra obtained from samples of poplar (Populus sp.), oak (Quercus sp.), and silver fir (Abies alba) were examined in this study. The most relevan t peaks were assigned according to the extensive literature in the area, and the differences observed discussed in terms of lignin and cellulose composition: by fixing a lignin reference signal intensity, the eellulose and hemicellulose moieties showed a strong depletion compared to the lignin signals in archaeological wood.

Research paper thumbnail of Multiple quantum coherences: New NMR tools to study materials and living systems

Applied Magnetic Resonance, 2004

Intermolecular multiple-quantum coherences have been proven in recent years to provide a novel co... more Intermolecular multiple-quantum coherences have been proven in recent years to provide a novel contrast mechanism to study heterogeneity in liquid systems. This subject represents a source of remarkable interest in the fields of physics of matter and biomedicine. Recent results achieved on intermolecular double-quantum signal transverse relaxation decay in confined liquid systems (such as in vivo bone marrow in trabecular bone, and doped water in glass capillary pipes) are reported and discussed in this paper. Correlated two-dimensional spectroscopy revamped by asymmetric z-gradient echo detection-like sequences were implemented in order to perform intermolecular doublequantum transverse relaxation T2D Q and ~OQ measurements. Our experimental results indicated that the relationship ~.n = ~/n between n-quantum transverse relaxation time and the conventional singlequantum ~ only applies for homogeneous systems and fails in the case of highly heterogeneous systems like porous systems.

Research paper thumbnail of DTI of trabecular bone marrow

Magnetic Resonance Imaging, 2005

The development of NMR diffusion imaging and diffusion tensor imaging (DTI) has offered the possi... more The development of NMR diffusion imaging and diffusion tensor imaging (DTI) has offered the possibility of studying the porous structures beyond anatomical imaging. In fact, random molecular motions, within tissue components, probe tissue microstructures. Up to now, the DTI method was mainly used to investigate cerebral morphology and study white matter diseases. In this study, it has been applied to trabecular bone marrow analysis to obtain structural information on spongy bone tissue. Our first results show that DTI could represent an important tool in studying the microstructural architecture of the trabecular bone as well as the microarchitecture of porous media.

Research paper thumbnail of Characterisation of corrosion layers formed under burial environment of copper-based Greek and Roman coins from Pompeii

Applied Physics A, 2015

ABSTRACT This paper reports on a study carried out on patinas covering copper-based Greek and Rom... more ABSTRACT This paper reports on a study carried out on patinas covering copper-based Greek and Roman coins found in the archaeological excavation of Regio VIII.7.1-15 in Pompeii (Italy). Since in cultural heritage ancient artefacts should not be damaged, non-destructive and micro-destructive techniques have been used to identify typical and uncommon compounds and to characterize the surface morphology. The chlorine content of light green patinas and the presence of typical minerals allowed us to identify the bronze disease. Coins from the same stratigraphic unit have shown different morphologies of corrosion, probably due to different micro-environmental conditions.

Research paper thumbnail of New results in the application of innovative experimental techniques for investigation of stone decay's processes

Proceedings of the 9th International Congress on Deterioration and Conservation of Stone, 2000

Research paper thumbnail of The Italian Alzheimer's Disease Neuroimaging Initiative (IADNI)

Alzheimer's & Dementia, 2012

Research paper thumbnail of Influence of Cellulosic Additives on Tricalcium Silicate Hydration:  Nuclear Magnetic Resonance Relaxation Time Analysis

The Journal of Physical Chemistry B, 2004

This paper reports a study on the effects of cellulose additives on the setting process of trical... more This paper reports a study on the effects of cellulose additives on the setting process of tricalcium silicate (C 3 S) paste. Cellulose and cellulose derivatives are largely used in the cement industry due to their excellent water carrying capacity that makes these additives essential in the practice of the extrusion processes. However, how they are effective in many processes is not known. We addressed this point investigating the hydration kinetics of C 3 S in the presence of cellulose derivative by thermal analysis and water proton NMR relaxation. Both these methods provided useful information on the mechanisms of the C 3 S curing process involving cellulose. The experimental results clearly show that cellulose additives act as a regulator of water release during the whole hydration process. A quantitative description of this process is reported.

Research paper thumbnail of The Italian Alzheimer's Disease Neuroimaging Initiative (I-ADNI): Validation of Structural MR Imaging

Journal of Alzheimer's Disease, May 19, 2014

Research paper thumbnail of Factors Affecting OPC Early Age Hydration, Studied by NMR: Fineness, Water to Cement Ratio and Curing Temperature

Research paper thumbnail of Evaluation of stone pore size distribution by means of NMR

Proceedings of the 9th International Congress on Deterioration and Conservation of Stone, 2000

Publisher Summary Nuclear magnetic resonance (NMR) is a technique that exploits magnetic properti... more Publisher Summary Nuclear magnetic resonance (NMR) is a technique that exploits magnetic properties of atomic nuclei with spin quantum number different from zero in an external magnetic field. The energy exchanges between the system and its surroundings is obtained by studying the time length needed for the spin system magnetization to reach the equilibrium value, after a selected perturbation. Therefore, NMR helps in determining the interactions between the pore walls and the hydrogen nuclei of water molecules trapped in the stone porous structure. This further gives information about the chemical-physical properties of the porous matrix. The determination of porous matrix properties in natural porous stones is a very important goal in the Cultural Heritage conservation field. Porous structure of a natural stone depends on its genesis and on its particular history. This chapter describes the application of nondestructive NMR technique to determine pore size distribution function on samples of Carrara marble, Candoglia marble, and travertine. The experiment conducted compares the experimental relaxation data with the data obtained from a simulated porous system. Two marbles and one limestone are compared with samples treated with three different agents: (1) a consolidating, adhesive and binding agent; (2) a hydrophobic protective and preconsolidating agent; and (3) a hydrophobic protective no-film agent. NMR data based analysis is totally non-destructive and is representative of the critical regions where water can be dangerous. It provides useful analysis of the material conservation degree and a pointed conservative treatment. The chapter also provides tables and graphs to illustrate mean values and standard deviations of pore size distribution function in different samples.

Research paper thumbnail of Influence of Cellulosic Additives on Tricalcium Silicate Hydration:  Nuclear Magnetic Resonance Relaxation Time Analysis

The Journal of Physical Chemistry B, 2004

This paper reports a study on the effects of cellulose additives on the setting process of trical... more This paper reports a study on the effects of cellulose additives on the setting process of tricalcium silicate (C 3 S) paste. Cellulose and cellulose derivatives are largely used in the cement industry due to their excellent water carrying capacity that makes these additives essential in the practice of the extrusion processes. However, how they are effective in many processes is not known. We addressed this point investigating the hydration kinetics of C 3 S in the presence of cellulose derivative by thermal analysis and water proton NMR relaxation. Both these methods provided useful information on the mechanisms of the C 3 S curing process involving cellulose. The experimental results clearly show that cellulose additives act as a regulator of water release during the whole hydration process. A quantitative description of this process is reported.

Research paper thumbnail of New openings for porous systems research from intermolecular double-quantum NMR

Solid State Nuclear Magnetic Resonance, 2004

It has been recently recognized that residual intermolecular double-quantum coherences (iDQcs) pr... more It has been recently recognized that residual intermolecular double-quantum coherences (iDQcs) provide a novel contrast mechanism to study heterogeneity in liquid systems. This is of much interest in the field of the physics of matter and biomedicine. Nowadays, literature concerning the behaviour of the iDQc signal originated by highly heterogeneous systems such as fluids in porous media is scarce. In this paper, we report and discuss our principal results about iDQc signal behaviour in confined liquid systems (trabecular bone, travertine, porous standard systems) and also some new results obtained on doped water in glass capillary pipes.

Research paper thumbnail of Diffusion tensor imaging to study anisotropy in a particular porous system: The trabecular bone network

Solid State Nuclear Magnetic Resonance, 2005

During the last decade, considerable effort has been invested into the development of diffusion t... more During the last decade, considerable effort has been invested into the development of diffusion tensor imaging (DTI) mainly used to investigate cerebral morphology. The aim of this paper is to review and to discuss our recent results about high magnetic field DTI application to study spongy bone tissue. Due to its peculiar properties, spongy bone represents a particular porous system sample. Strategies to perform DTI on porous systems and issues linked to DTI outcome interpretation are presented on the basis of our results concerning trabecular bone network characterization.

Research paper thumbnail of Intermolecular double-quantum NMR techniques to probe microstructures on porous media

Magnetic Resonance Imaging, 2003

Research paper thumbnail of NMR study on the early stages of hydration of a porous carbonate stone

Magnetic Resonance Imaging, 2003

Nuclear Magnetic Resonance was employed to obtain information on the pore filling during the abso... more Nuclear Magnetic Resonance was employed to obtain information on the pore filling during the absorption process. A porous carbonate stone, largely employed for buildings and mainly outdoor decorations was studied during water absorption by capillary rise, and filled pores radii were evaluated by comparison between experimental and theoretical parametric magnetization decay curves. Non mono-exponential T 2 allowed spin populations to be split among the associated different relaxation times.

Research paper thumbnail of Characterization of porous media structure by non linear NMR methods

Magnetic Resonance Imaging, 2001

In this paper we discuss the possibility of modifying the multiple spin echoes existing theory, d... more In this paper we discuss the possibility of modifying the multiple spin echoes existing theory, developed for a homogeneous system, to describe also an inhomogeneous system such as a porous medium. We report here the first experimental application of MSE methods to materials like travertine. The ratio A 2 /A 1 from water in travertine presents minima for characteristic values of the delay time , like what was previously observed in the trabecular bone. By a judicious choice of the delay time and of the G gradient strength, the MSE sequence can be made sensitive to a specific length-scale of the sample heterogeneity. Furthermore the MSE image shows a particular new contrast that makes the non linear NMR method very attractive for the assessment of variations of the porous structure in porous systems.

Research paper thumbnail of The influence of superplasticizers on the first steps of tricalcium silicate hydration studied by NMR techniques

Magnetic Resonance Imaging, 2005

The influence of superplasticizer sulfonated naphthalene formaldehyde (SNF) on the hydration proc... more The influence of superplasticizer sulfonated naphthalene formaldehyde (SNF) on the hydration process of tricalcium silicate (C3S) paste was investigated by 1 H nuclear magnetic resonance spin-spin and spin lattice relaxation times. The addition of SNF superplasticizer to C3S paste clearly affects the morphology and growth rates of the hydration products, mainly by increasing the dormant period length, which lasts for several hours more than in conventional C3S hydrated paste, while reducing the acceleration period length. The relaxation data indicated that a pronounced delay occurs in the C3S hardening when sulfonated polymers are added to the makeup water. For all the analyzed samples, prepared with a water-to-C3S ratio of 0.4, the decay of the echo magnetization has been fitted by adopting both a monoexponential and a biexponential relaxation model in order to evaluate the contributions from water in different regimes of hydration.

Research paper thumbnail of NMR relaxation times in treated marble samples

Magnetic Resonance Imaging, 2001

Research paper thumbnail of NMR applications to low porosity carbonate stones

Magnetic Resonance Imaging, 2003

The purpose of this paper is to investigate NMR applications to porous materials widely employed ... more The purpose of this paper is to investigate NMR applications to porous materials widely employed in artistic and historical monuments and largely studied in the Cultural Heritage conservation field. Carrara marble, Candoglia marble and travertine samples were studied and data from relaxation times measurements were compared. Very interesting results from treated samples are reported and explained under the structure related spin lattice relaxation time point of view. Images of Carrara marble aged sample (XIX century), coming from the Florence Cathedral obtained for short absorption time of water by capillary rise and for relatively small thickness slices together show the fluid's spatial distribution within the stone. Comparative images showing untreated sample with the treated ones were obtained suggesting very useful applications for the determination of treatment effectiveness.

Research paper thumbnail of Effects induced in marbles by water-repellent compounds: the NMR contribution

Applied Magnetic Resonance, 2002

The purpose of this paper is to investigate nuclear magnetic resonance (NMR) applications to poro... more The purpose of this paper is to investigate nuclear magnetic resonance (NMR) applications to porous materials widely employed in artistic and historieal monuments and largely studied in the Cultural Heritage conservation field, with the airo of studying structural variations induced in the porous matrix by the application of strengthening and water-repellent agents. Carrara marble and Candoglia marble samples, both in the native state and after treatment, were studied and data from relaxation time measurements were compared. Results collected on treated samples are reported and explained in terms of the relation between spin-lattice relaxation time and the structure of the porous materials. Traditional techniques were employed in addition to NMR analysis on marble samples for the evaluation of the preservative performances of three agents generally employed in the restoration yards. Comparative images showing untreated samples with the treated ones were obtained suggesting very useful applications for the determination of treatment effectiveness.

Research paper thumbnail of 13C CPMAS NMR spectroscopic analysis applied to wood characterization

Applied Magnetic Resonance, 2005

Solid-state nuclear magnetic resonance (NMR) spectroscopic analysis were carried out on recent an... more Solid-state nuclear magnetic resonance (NMR) spectroscopic analysis were carried out on recent and archaeological wood. Cross-polarization-magic-angle spinning ~3C NMR spectra obtained from samples of poplar (Populus sp.), oak (Quercus sp.), and silver fir (Abies alba) were examined in this study. The most relevan t peaks were assigned according to the extensive literature in the area, and the differences observed discussed in terms of lignin and cellulose composition: by fixing a lignin reference signal intensity, the eellulose and hemicellulose moieties showed a strong depletion compared to the lignin signals in archaeological wood.

Research paper thumbnail of Multiple quantum coherences: New NMR tools to study materials and living systems

Applied Magnetic Resonance, 2004

Intermolecular multiple-quantum coherences have been proven in recent years to provide a novel co... more Intermolecular multiple-quantum coherences have been proven in recent years to provide a novel contrast mechanism to study heterogeneity in liquid systems. This subject represents a source of remarkable interest in the fields of physics of matter and biomedicine. Recent results achieved on intermolecular double-quantum signal transverse relaxation decay in confined liquid systems (such as in vivo bone marrow in trabecular bone, and doped water in glass capillary pipes) are reported and discussed in this paper. Correlated two-dimensional spectroscopy revamped by asymmetric z-gradient echo detection-like sequences were implemented in order to perform intermolecular doublequantum transverse relaxation T2D Q and ~OQ measurements. Our experimental results indicated that the relationship ~.n = ~/n between n-quantum transverse relaxation time and the conventional singlequantum ~ only applies for homogeneous systems and fails in the case of highly heterogeneous systems like porous systems.

Research paper thumbnail of DTI of trabecular bone marrow

Magnetic Resonance Imaging, 2005

The development of NMR diffusion imaging and diffusion tensor imaging (DTI) has offered the possi... more The development of NMR diffusion imaging and diffusion tensor imaging (DTI) has offered the possibility of studying the porous structures beyond anatomical imaging. In fact, random molecular motions, within tissue components, probe tissue microstructures. Up to now, the DTI method was mainly used to investigate cerebral morphology and study white matter diseases. In this study, it has been applied to trabecular bone marrow analysis to obtain structural information on spongy bone tissue. Our first results show that DTI could represent an important tool in studying the microstructural architecture of the trabecular bone as well as the microarchitecture of porous media.

Research paper thumbnail of Characterisation of corrosion layers formed under burial environment of copper-based Greek and Roman coins from Pompeii

Applied Physics A, 2015

ABSTRACT This paper reports on a study carried out on patinas covering copper-based Greek and Rom... more ABSTRACT This paper reports on a study carried out on patinas covering copper-based Greek and Roman coins found in the archaeological excavation of Regio VIII.7.1-15 in Pompeii (Italy). Since in cultural heritage ancient artefacts should not be damaged, non-destructive and micro-destructive techniques have been used to identify typical and uncommon compounds and to characterize the surface morphology. The chlorine content of light green patinas and the presence of typical minerals allowed us to identify the bronze disease. Coins from the same stratigraphic unit have shown different morphologies of corrosion, probably due to different micro-environmental conditions.

Research paper thumbnail of New results in the application of innovative experimental techniques for investigation of stone decay's processes

Proceedings of the 9th International Congress on Deterioration and Conservation of Stone, 2000

Research paper thumbnail of The Italian Alzheimer's Disease Neuroimaging Initiative (IADNI)

Alzheimer's & Dementia, 2012

Research paper thumbnail of Influence of Cellulosic Additives on Tricalcium Silicate Hydration:  Nuclear Magnetic Resonance Relaxation Time Analysis

The Journal of Physical Chemistry B, 2004

This paper reports a study on the effects of cellulose additives on the setting process of trical... more This paper reports a study on the effects of cellulose additives on the setting process of tricalcium silicate (C 3 S) paste. Cellulose and cellulose derivatives are largely used in the cement industry due to their excellent water carrying capacity that makes these additives essential in the practice of the extrusion processes. However, how they are effective in many processes is not known. We addressed this point investigating the hydration kinetics of C 3 S in the presence of cellulose derivative by thermal analysis and water proton NMR relaxation. Both these methods provided useful information on the mechanisms of the C 3 S curing process involving cellulose. The experimental results clearly show that cellulose additives act as a regulator of water release during the whole hydration process. A quantitative description of this process is reported.