Ioana Stanciu - Academia.edu (original) (raw)

Papers by Ioana Stanciu

Oriental Journal of Chemistry, 2024

This article presents the study of the influence of the oxidation of vegetable oils on therheolog... more This article presents the study of the influence of the oxidation of vegetable oils on therheological parameters. The viscosity of oxidized vegetable oils in relation to non-oxidized ones increases for soybean oil and then corn oil. For oxidized and non-oxidized olive and rapeseed oils, there are no increases as in the previous case.

Oriental Journal of Chemistry/Oriental journal of chemistry, Jun 27, 2024

The first archaeological mentions of cacao date back nearly 4,000 years and were discovered by re... more The first archaeological mentions of cacao date back nearly 4,000 years and were discovered by researchers in Central America and Mexico. Chocolate is a compound that contains milk powder, cocoa, sugar, vanilla sugar and water. This article presents two rheological equations determined by the method of least squares and whose coefficients depend on the chocolate concentration and temperature. We used a DV-3P Anton Paar digital rotational viscometer.

Oriental Journal of Chemistry/Oriental journal of chemistry, Apr 30, 2024

This article proposes a polynomial equation and another exponential equation of the second order ... more This article proposes a polynomial equation and another exponential equation of the second order that describes the rheological behavior of chocolate. The second-order polynomial and exponential functions describe the non-Newtonian behavior of chocolate in the temperature range of 36 and 44°C. The rheological study of the chocolate was carried out at the shear speed of the chocolate wa between 0.1s-1 and 68s-1 .

Oriental Journal of Chemistry/Oriental journal of chemistry, Feb 25, 2024

Sesame (Sesamum indicum) oil is the fatty matter obtained from sesame seeds, by cold pressing or ... more Sesame (Sesamum indicum) oil is the fatty matter obtained from sesame seeds, by cold pressing or hot pressing, followed by refining. The seeds must have a maximum moisture content of 7% and must be free of foreign bodies. After pressing, the oil is decanted and then filtered, through a natural cotton filter, thus ensuring the superior quality of the obtained oil. Sesame oil is the most resistant oil to oxidation and is stable at room temperature. The burning point is 177 degrees for cold pressed sesame oil.

Oriental journal of chemistry, Dec 26, 2023

Vegetable oils are often associated with well-known varieties like sunflower, olive, and corn. Ho... more Vegetable oils are often associated with well-known varieties like sunflower, olive, and corn. However, there are lesser-known options worth exploring to appreciate their distinct qualities. One such overlooked oil is cottonseed oil, derived from the Malvaceae cotton family plant. In a recent study, we delved into the rheological behavior of cottonseed oil. Similar to many vegetable oils, it exhibits a non-Newtonian behavior, making it a viable alternative to mineral oils. The rheological analysis was conducted using the Brookfield RVDV III Ultra Rheometer, with shear rates incrementally increasing.

Oriental Journal Of Chemistry

Almond (Prunus amygdalus) oil is recommended for those for whom other treatments to remedy hair l... more Almond (Prunus amygdalus) oil is recommended for those for whom other treatments to remedy hair loss problems have not worked. Almond oil was studied at increasing temperatures and shear rates and we obtained the rheological parameters corresponding to the oil through regression. This paper reflects a study on the rheology of almond oil used as biodegradable lubricant using the Brookfield RVDV II I Ultra Rheometer system.

IntechOpen eBooks, Dec 14, 2022

Significant progress has been made on biopolymers in recent years. Biopolymers are preferred to o... more Significant progress has been made on biopolymers in recent years. Biopolymers are preferred to other materials because they have specific physical, chemical, biological, biomechanical, and degradation properties. Many natural or synthetic biopolymers can degrade hydrolytically or enzymatically and are used for many applications.

IntechOpen eBooks, Apr 5, 2023

Palm oil is dark yellow to red with a sweet taste and violet scent. Under the action of oxygen in... more Palm oil is dark yellow to red with a sweet taste and violet scent. Under the action of oxygen in the air, palm oil discolors due to the oxidation of carotene. The sample at different temperatures was recorded at different shear rates. Based on the rheograms (graph of the average shear stress versus shear rate), the studied ones proved to be Newtonian fluid. The shear range used did not significantly affect the absolute viscosities of the palm oil at different temperatures. The absolute viscosities of palm oil have decreased with increasing temperature and can be equipped with an Arrheniustype relationship.

Oriental journal of chemistry, Jun 30, 2023

The rheological behavior of corn oil can be studied with four rheological models found in the spe... more The rheological behavior of corn oil can be studied with four rheological models found in the specialized literature.The rheological behavior of corn oil can be analyzed if it is subjected to an increasing shear rate. The behavior of this fluid can be appreciated based on the experimental data, graphically representing the variation the shearing stress with the shear velocity. This curve represents the mathematical model of the rheological behavior of the product. The rheological behavior of the corn oil was analyzed with the mixing rheometer type Viscotester VT 550 (Haake).

Oriental journal of chemistry, Apr 30, 2021

The study was performed to determine the effect of the logarithm of the viscosity on the inverse ... more The study was performed to determine the effect of the logarithm of the viscosity on the inverse of the absolute temperature for orange honey. Based on the studied rheograms, it turned out to be a non-Newtonian fluid. The shear range used did not significantly affect the absolute viscosities of orange honey at different temperatures. The absolute viscosities of orange honey have decreased with increasing temperature and can be equipped with an Arrhenius type relationship. The rheological behavior is influenced by both humidity and its composition.

Oriental Journal Of Chemistry

Corn must go through a complex refining process to produce corn oil. This process gives corn oil ... more Corn must go through a complex refining process to produce corn oil. This process gives corn oil many unique characteristics, although not all of them are positive. Corn oil is 100% fat, with no protein or carbohydrates. One tablespoon (15 ml) of corn oil contains:calories: 122; fats: 14 g and vitamin E: 13% of the recommended daily intake. This article represents the dependence of dynamic viscosity on temperature for corn oil. It was studied with the Rheotest VT 550 system at shear rates and increasing temperatures.

Oriental Journal Of Chemistry

In this article I presented the rheological behavior of corn oil studied in the temperature range... more In this article I presented the rheological behavior of corn oil studied in the temperature range 40-100°C and shear rates between 3.3 and 1312.0 s-1. The experiments showed the decrease of dynamic viscosity with temperature and shear rate. To study the dependence of dynamic viscosity on temperature, we applied two equations that perfectly describe the rheological behavior of corn oil. These equations are the Andrade equation and the Azian equation for which the correlation coefficients have values close to unity.

Oriental Journal of Chemistry, 2024

In this article we studied chocolate with 100% cocoa without lecithin and traces of milk in the f... more In this article we studied chocolate with 100% cocoa without lecithin and traces of milk in the form of chips. The data obtained are in accordance with those obtained from the specialized literature. This article proposes two relations of dependence of log dynamic viscosity on log shear rate. The relations determined by second-order polynomial and exponential fitting can be successfully applied to confectionery products because the obtained correlation coefficients are close to unity.

Oriental journal of chemistry, Feb 28, 2023

Olive oil is a vegetable oil used mainly in the culinary field, which is extracted from freshly h... more Olive oil is a vegetable oil used mainly in the culinary field, which is extracted from freshly harvested olive fruits (Olea europaea). It is the richest source of monounsaturated fats. Its uses are varied, being used in cooking, in cosmetics, medicines and soaps, and in the past as lamp oil. This article presents the experimental research carried out in order to quantify the change in the rheological properties of Olive oil and establish the variation range of the characteristic parameters. The data obtained are useful for the behavior of the engine and, in particular, of lubricants in general.

Indian journal of science and technology, Jan 29, 2023

Objectives: To determine the viscosity index of hydraulic oil by three methods. These methods are... more Objectives: To determine the viscosity index of hydraulic oil by three methods. These methods are: the viscosity index determined by a mathematical relationship, using a calculation program and the graphic method. The study also intends to determine the viscosity-temperature coefficient for the hydraulic oil. Methods: To determine the kinematic viscosity of the hydraulic oil, we used a calculation formula that transforms the dynamic viscosity into kinetic viscosity knowing the density of the fluid. Thus, we determined the dynamic viscosity of the hydraulic oil with the Schott Ubbelohde viscometer at the temperatures of 40 and 100 • C. To determine the dynamic viscosity of hydraulic oil at 40 • C and 100 • C, we used a water bath. The dynamic viscosity thus obtained was transformed into the kinematic viscosity of the oil by dividing it by density. Findings: The lowest viscosity index of the hydraulic oil determined using the computer program is 101. The viscosity index of the hydraulic oil determined with relation (1) is 58% higher than using the computer program. The viscosity index determined by the graphic method is 50% higher than the one determined by the computer program. The viscositytemperature coefficient has a value of 0.8380. Novelty: Knowing the viscosity index of hydraulic oil is important for starting the engine at high temperatures and at low temperatures. At high temperatures, the oil chemically degrades and the molecules break down. The properties of hydraulic oils depend a lot on the way the hydraulic system works and the limits imposed on them in different conditions.

Oriental Journal Of Chemistry

The purpose of this article is to determine the rheological behavior of fruit and vegetable puree... more The purpose of this article is to determine the rheological behavior of fruit and vegetable purees as well as tomato sauces at a temperature of 250C and to find in the literature a rheological model that describes their behavior. Fruit and vegetable purees as well as tomato sauces have a non-Newtonian behavior. These were studied with the Brookfield DV-III Ultra reovascometer at 250C. The Herschel-Bulkley model was found for products with pseudoplastic behavior, while the law of power and the Bingham model for the others. The clarified and desiccated fruit juices as well as the carrot juice showed a Newtonian behavior.

Oriental Journal Of Chemistry

In this article we studied the olive oil extracted from the cold pressed fruits and separated by ... more In this article we studied the olive oil extracted from the cold pressed fruits and separated by centrifugation. The rheological models found in the literature for the dependence of the shear rate on the shear stress are: the Herschel – Bulkley model, the Ostwald model and the Bingham model. By linearizing the obtained data, we found two models that describe the behavior of the oil at the temperatures at which the olive oil was studied. Olive oil has a non-Newtonian behavior.

Journal of Biochemical Technology

Rheology is a branch of science with multiple implications in numerous sectors of industry, also ... more Rheology is a branch of science with multiple implications in numerous sectors of industry, also constituting a generous field due to its multidisciplinary character. Thus, solving a problem in rheology calls for knowledge from modern mathematics, physics, chemistry, chemical and mechanical engineering, and materials science. Driven by the appearance of new materials (plastics and synthetic fibers, varnishes and paints, detergents, adhesives, pharmaceutical and cosmetic products, biological materials, etc.) Rapeseed ranks third in the world as a source of vegetable oil, after palm oil and soybean oil Through the exponential fit, we found a relation between the dependence of the dynamic viscosity on the temperature at different shear rates. The obtained correlation coefficients have values close to unity for all shear speeds to which the refined rapeseed oil was subjected. The found equation faithfully describes the non-Newtonian behavior of the studied oil in the temperature range. For the studied oil, the correlation coefficients have values between 0.9725 and 0.9955.

Oriental Journal Of Chemistry

Food gums are hydrophilic colloids, which due to their functional properties are used in the food... more Food gums are hydrophilic colloids, which due to their functional properties are used in the food industry. For non-Newtonian rubber solutions to these factors must be added the dependence between the shear stress and the shear rate. Experimental data were obtained with a Haake RV20 rotary viscometer with a con-plate system. The range of shear speeds for which the determinations were made was between 24 and 3177s-1, and the shear stresses between 2.2 and 116.9Pa.

Oriental Journal Of Chemistry

The proposed rheological study for six vegetable oils which are: olive oil, coconut oil, almound ... more The proposed rheological study for six vegetable oils which are: olive oil, coconut oil, almound oil, sesame oil, cottonseed oil and sunflower oil shows their non-Newtonian behavior. With the help of the Rheotest viscometer I determined the shear stress and then the dynamic viscosity. The analysis of the rheograms shows a decrease in the dynamic viscosity with the temperature and shear rate for the four studied vegetable oils.

Oriental Journal of Chemistry, 2024

This article presents the study of the influence of the oxidation of vegetable oils on therheolog... more This article presents the study of the influence of the oxidation of vegetable oils on therheological parameters. The viscosity of oxidized vegetable oils in relation to non-oxidized ones increases for soybean oil and then corn oil. For oxidized and non-oxidized olive and rapeseed oils, there are no increases as in the previous case.

Oriental Journal of Chemistry/Oriental journal of chemistry, Jun 27, 2024

The first archaeological mentions of cacao date back nearly 4,000 years and were discovered by re... more The first archaeological mentions of cacao date back nearly 4,000 years and were discovered by researchers in Central America and Mexico. Chocolate is a compound that contains milk powder, cocoa, sugar, vanilla sugar and water. This article presents two rheological equations determined by the method of least squares and whose coefficients depend on the chocolate concentration and temperature. We used a DV-3P Anton Paar digital rotational viscometer.

Oriental Journal of Chemistry/Oriental journal of chemistry, Apr 30, 2024

This article proposes a polynomial equation and another exponential equation of the second order ... more This article proposes a polynomial equation and another exponential equation of the second order that describes the rheological behavior of chocolate. The second-order polynomial and exponential functions describe the non-Newtonian behavior of chocolate in the temperature range of 36 and 44°C. The rheological study of the chocolate was carried out at the shear speed of the chocolate wa between 0.1s-1 and 68s-1 .

Oriental Journal of Chemistry/Oriental journal of chemistry, Feb 25, 2024

Sesame (Sesamum indicum) oil is the fatty matter obtained from sesame seeds, by cold pressing or ... more Sesame (Sesamum indicum) oil is the fatty matter obtained from sesame seeds, by cold pressing or hot pressing, followed by refining. The seeds must have a maximum moisture content of 7% and must be free of foreign bodies. After pressing, the oil is decanted and then filtered, through a natural cotton filter, thus ensuring the superior quality of the obtained oil. Sesame oil is the most resistant oil to oxidation and is stable at room temperature. The burning point is 177 degrees for cold pressed sesame oil.

Oriental journal of chemistry, Dec 26, 2023

Vegetable oils are often associated with well-known varieties like sunflower, olive, and corn. Ho... more Vegetable oils are often associated with well-known varieties like sunflower, olive, and corn. However, there are lesser-known options worth exploring to appreciate their distinct qualities. One such overlooked oil is cottonseed oil, derived from the Malvaceae cotton family plant. In a recent study, we delved into the rheological behavior of cottonseed oil. Similar to many vegetable oils, it exhibits a non-Newtonian behavior, making it a viable alternative to mineral oils. The rheological analysis was conducted using the Brookfield RVDV III Ultra Rheometer, with shear rates incrementally increasing.

Oriental Journal Of Chemistry

Almond (Prunus amygdalus) oil is recommended for those for whom other treatments to remedy hair l... more Almond (Prunus amygdalus) oil is recommended for those for whom other treatments to remedy hair loss problems have not worked. Almond oil was studied at increasing temperatures and shear rates and we obtained the rheological parameters corresponding to the oil through regression. This paper reflects a study on the rheology of almond oil used as biodegradable lubricant using the Brookfield RVDV II I Ultra Rheometer system.

IntechOpen eBooks, Dec 14, 2022

Significant progress has been made on biopolymers in recent years. Biopolymers are preferred to o... more Significant progress has been made on biopolymers in recent years. Biopolymers are preferred to other materials because they have specific physical, chemical, biological, biomechanical, and degradation properties. Many natural or synthetic biopolymers can degrade hydrolytically or enzymatically and are used for many applications.

IntechOpen eBooks, Apr 5, 2023

Palm oil is dark yellow to red with a sweet taste and violet scent. Under the action of oxygen in... more Palm oil is dark yellow to red with a sweet taste and violet scent. Under the action of oxygen in the air, palm oil discolors due to the oxidation of carotene. The sample at different temperatures was recorded at different shear rates. Based on the rheograms (graph of the average shear stress versus shear rate), the studied ones proved to be Newtonian fluid. The shear range used did not significantly affect the absolute viscosities of the palm oil at different temperatures. The absolute viscosities of palm oil have decreased with increasing temperature and can be equipped with an Arrheniustype relationship.

Oriental journal of chemistry, Jun 30, 2023

The rheological behavior of corn oil can be studied with four rheological models found in the spe... more The rheological behavior of corn oil can be studied with four rheological models found in the specialized literature.The rheological behavior of corn oil can be analyzed if it is subjected to an increasing shear rate. The behavior of this fluid can be appreciated based on the experimental data, graphically representing the variation the shearing stress with the shear velocity. This curve represents the mathematical model of the rheological behavior of the product. The rheological behavior of the corn oil was analyzed with the mixing rheometer type Viscotester VT 550 (Haake).

Oriental journal of chemistry, Apr 30, 2021

The study was performed to determine the effect of the logarithm of the viscosity on the inverse ... more The study was performed to determine the effect of the logarithm of the viscosity on the inverse of the absolute temperature for orange honey. Based on the studied rheograms, it turned out to be a non-Newtonian fluid. The shear range used did not significantly affect the absolute viscosities of orange honey at different temperatures. The absolute viscosities of orange honey have decreased with increasing temperature and can be equipped with an Arrhenius type relationship. The rheological behavior is influenced by both humidity and its composition.

Oriental Journal Of Chemistry

Corn must go through a complex refining process to produce corn oil. This process gives corn oil ... more Corn must go through a complex refining process to produce corn oil. This process gives corn oil many unique characteristics, although not all of them are positive. Corn oil is 100% fat, with no protein or carbohydrates. One tablespoon (15 ml) of corn oil contains:calories: 122; fats: 14 g and vitamin E: 13% of the recommended daily intake. This article represents the dependence of dynamic viscosity on temperature for corn oil. It was studied with the Rheotest VT 550 system at shear rates and increasing temperatures.

Oriental Journal Of Chemistry

In this article I presented the rheological behavior of corn oil studied in the temperature range... more In this article I presented the rheological behavior of corn oil studied in the temperature range 40-100°C and shear rates between 3.3 and 1312.0 s-1. The experiments showed the decrease of dynamic viscosity with temperature and shear rate. To study the dependence of dynamic viscosity on temperature, we applied two equations that perfectly describe the rheological behavior of corn oil. These equations are the Andrade equation and the Azian equation for which the correlation coefficients have values close to unity.

Oriental Journal of Chemistry, 2024

In this article we studied chocolate with 100% cocoa without lecithin and traces of milk in the f... more In this article we studied chocolate with 100% cocoa without lecithin and traces of milk in the form of chips. The data obtained are in accordance with those obtained from the specialized literature. This article proposes two relations of dependence of log dynamic viscosity on log shear rate. The relations determined by second-order polynomial and exponential fitting can be successfully applied to confectionery products because the obtained correlation coefficients are close to unity.

Oriental journal of chemistry, Feb 28, 2023

Olive oil is a vegetable oil used mainly in the culinary field, which is extracted from freshly h... more Olive oil is a vegetable oil used mainly in the culinary field, which is extracted from freshly harvested olive fruits (Olea europaea). It is the richest source of monounsaturated fats. Its uses are varied, being used in cooking, in cosmetics, medicines and soaps, and in the past as lamp oil. This article presents the experimental research carried out in order to quantify the change in the rheological properties of Olive oil and establish the variation range of the characteristic parameters. The data obtained are useful for the behavior of the engine and, in particular, of lubricants in general.

Indian journal of science and technology, Jan 29, 2023

Objectives: To determine the viscosity index of hydraulic oil by three methods. These methods are... more Objectives: To determine the viscosity index of hydraulic oil by three methods. These methods are: the viscosity index determined by a mathematical relationship, using a calculation program and the graphic method. The study also intends to determine the viscosity-temperature coefficient for the hydraulic oil. Methods: To determine the kinematic viscosity of the hydraulic oil, we used a calculation formula that transforms the dynamic viscosity into kinetic viscosity knowing the density of the fluid. Thus, we determined the dynamic viscosity of the hydraulic oil with the Schott Ubbelohde viscometer at the temperatures of 40 and 100 • C. To determine the dynamic viscosity of hydraulic oil at 40 • C and 100 • C, we used a water bath. The dynamic viscosity thus obtained was transformed into the kinematic viscosity of the oil by dividing it by density. Findings: The lowest viscosity index of the hydraulic oil determined using the computer program is 101. The viscosity index of the hydraulic oil determined with relation (1) is 58% higher than using the computer program. The viscosity index determined by the graphic method is 50% higher than the one determined by the computer program. The viscositytemperature coefficient has a value of 0.8380. Novelty: Knowing the viscosity index of hydraulic oil is important for starting the engine at high temperatures and at low temperatures. At high temperatures, the oil chemically degrades and the molecules break down. The properties of hydraulic oils depend a lot on the way the hydraulic system works and the limits imposed on them in different conditions.

Oriental Journal Of Chemistry

The purpose of this article is to determine the rheological behavior of fruit and vegetable puree... more The purpose of this article is to determine the rheological behavior of fruit and vegetable purees as well as tomato sauces at a temperature of 250C and to find in the literature a rheological model that describes their behavior. Fruit and vegetable purees as well as tomato sauces have a non-Newtonian behavior. These were studied with the Brookfield DV-III Ultra reovascometer at 250C. The Herschel-Bulkley model was found for products with pseudoplastic behavior, while the law of power and the Bingham model for the others. The clarified and desiccated fruit juices as well as the carrot juice showed a Newtonian behavior.

Oriental Journal Of Chemistry

In this article we studied the olive oil extracted from the cold pressed fruits and separated by ... more In this article we studied the olive oil extracted from the cold pressed fruits and separated by centrifugation. The rheological models found in the literature for the dependence of the shear rate on the shear stress are: the Herschel – Bulkley model, the Ostwald model and the Bingham model. By linearizing the obtained data, we found two models that describe the behavior of the oil at the temperatures at which the olive oil was studied. Olive oil has a non-Newtonian behavior.

Journal of Biochemical Technology

Rheology is a branch of science with multiple implications in numerous sectors of industry, also ... more Rheology is a branch of science with multiple implications in numerous sectors of industry, also constituting a generous field due to its multidisciplinary character. Thus, solving a problem in rheology calls for knowledge from modern mathematics, physics, chemistry, chemical and mechanical engineering, and materials science. Driven by the appearance of new materials (plastics and synthetic fibers, varnishes and paints, detergents, adhesives, pharmaceutical and cosmetic products, biological materials, etc.) Rapeseed ranks third in the world as a source of vegetable oil, after palm oil and soybean oil Through the exponential fit, we found a relation between the dependence of the dynamic viscosity on the temperature at different shear rates. The obtained correlation coefficients have values close to unity for all shear speeds to which the refined rapeseed oil was subjected. The found equation faithfully describes the non-Newtonian behavior of the studied oil in the temperature range. For the studied oil, the correlation coefficients have values between 0.9725 and 0.9955.

Oriental Journal Of Chemistry

Food gums are hydrophilic colloids, which due to their functional properties are used in the food... more Food gums are hydrophilic colloids, which due to their functional properties are used in the food industry. For non-Newtonian rubber solutions to these factors must be added the dependence between the shear stress and the shear rate. Experimental data were obtained with a Haake RV20 rotary viscometer with a con-plate system. The range of shear speeds for which the determinations were made was between 24 and 3177s-1, and the shear stresses between 2.2 and 116.9Pa.

Oriental Journal Of Chemistry

The proposed rheological study for six vegetable oils which are: olive oil, coconut oil, almound ... more The proposed rheological study for six vegetable oils which are: olive oil, coconut oil, almound oil, sesame oil, cottonseed oil and sunflower oil shows their non-Newtonian behavior. With the help of the Rheotest viscometer I determined the shear stress and then the dynamic viscosity. The analysis of the rheograms shows a decrease in the dynamic viscosity with the temperature and shear rate for the four studied vegetable oils.