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See detailEinige Beobachtungen über die Waschwirkung der Seifen : Dritte Mitteilung
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

voir Einige Beobazchtungen über die Waschwirkung der Seifen : Zweite Mitteilung

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See detailÜber langsame Aenderungen der Konstitution gewisser Salzlösungen
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

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See detailEinige Beobachtungen über die Waschwirkung der Seifen : Vierte Mitteilung
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

voir Einige Beobazchtungen über die Waschwirkung der Seifen : Zweite Mitteilung

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See detailEtude critique sur Jean d'Outremeuse
Kurth, Godefroid ULg

in Mémoires - Académie royale de Belgique, Classe des Lettres et des Sciences Morales et Politiques. Collection in-8 (1910), VII(2e série), 105

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See detailObservations sur l'action détersive des solutions de savon
Spring, Walthère ULg

in Bulletin de la Société Chimique de Belgique (1910), XXIV

Spring, W. Bull. soc. belg. chim. (1910), 24, 17-54; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). cf. C. A., 3, 1,599, 1613. The theories of ... [more ▼]

Spring, W. Bull. soc. belg. chim. (1910), 24, 17-54; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). cf. C. A., 3, 1,599, 1613. The theories of soap solns. up to the present time, including one of his own previously outlined. Further work shows that Fe2O3, acts similarly to Cu in forming colloidal combinations, and in combining to produce an acid and a basic soap. Soap forms with Fe2O3 a more stable combination than Fe2O3 forms with various solids, particularly with cellulose. It is found that 3.10 mol. Fe2O3 are pptd. by 1 mol. soap when the hydrosol of FeO3H3 and soap 3 are used. Soap agglutinates the hydrosol of alumina as it does Fe. The rapidity in both cases depends upon the proportions of material mixed as well as on other factors not yet so well defined. Solns. of soap with H3SiO3, clay and cellulose behave as lampblack. The experiments show that the detergent action of soap solns. is due to the formation of a combination of adsorption with the material to be removed, the combination having lost to a great extent the adhesive power possessed by the materials before their combination. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailObservations sur l'action détersive des solutions de savon : Troisième communication : Les solutions de savon et l'hydrosol aluminique
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1910), XXIX

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See detailQuelques remarques au sujet du travail de M. A. Reychler sur l'électrophorèse du noir de fumée
Spring, Walthère ULg

in Bulletin de la Société Chimique de Belgique (1910), XXIV(11), 416-420

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See detailSur une modification lente de la constitution des solutions de certains sels
Spring, Walthère ULg

in Bulletin de la Classe des Sciences. Académie Royale de Belgique (1910), (1), 11-22

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See detailObservations sur l'action détersive des solutions de savon : Quatrième et dernière communication : Les solutions de savon et l'acide silicique, l'argile et la cellulose
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1910), XXIX

Spring, W. Luttich. Rec. trav. chim. (1910), 29(1), 8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). see also C. A., 4, 138, 969. Study of the ... [more ▼]

Spring, W. Luttich. Rec. trav. chim. (1910), 29(1), 8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). see also C. A., 4, 138, 969. Study of the action of hydrated iron oxide, 7Fe2O3.3H2O on soap soln. of varying conc. led to the conclusions that the optimum suspension conc. of the soap soln. is 0.5%, that the soap splits into a basic and acid part, the basic combining with the Fe2O3 and the acid part remaining in soln., and that a soap soln. will remove Fe2O3 from its adsorption compds. with cellulose. Substituting an Fe hydrosol for the Fe2O3 it was found that pptn. occurred between limiting ratios of the soap to hydrosol, i. e., between 1 of soap to 2.16 of Fe2O3 and 1 of soap to 3.47 Fe2O3. The pptn. of Al2O3, with soap soln. shows a periodicity, the ratios of soap to Al2O3 in those solns. which become clear being approx. 8.33, 4.16, 2.06. If the wt. of Al2O3. exceeds that of the soap no pptn. occurs. A large excess of soap, 20 times the wt. of Al2O3, gives a suspension optimum, whereas 80 times the wt. of Al2O3 gives pptn. The speed of the reaction depends primarily on the ratio of the reacting substances. 7SiO2.3H2O combines with a basic constituent of soap, leaving an acid constituent of low ash in soln. The % of ash in the soap in soln. increases when more dil. soap solns. are used, due to soln. of SiO2. The adsorption compd. of basic soap with SiO2 dissociates on shaking with H2O. A pptn. optimum occurs at 1/8% soap soln., and a suspension optimum at 1/16 and 1/2%. A hydrated clay gave approx. the same results, pptg. about 60% of the soap from a 1/2% soln. The soap has a solvent action on the clay, a 1/8% soap soln. giving the highest ratio of suspended clay to soap. A suspension optimum for the settling of clay in soap soln. is found at 1/32% soap soln. Cellulose forms an adsorption compd. with the basic constituents of soap, the cleavage of the soap being noticeable only in concs. above 1%. The cleansing action of soap is due to the formation of an adsorption compd. with the material to be removed, which thus loses its adhesive properties. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur une modification lente de la constitution des solutions de certains sels
Spring, Walthère ULg

in Recueil des Travaux Chimiques des Pays-Bas et de la Belgique (1910), XXIX

By Spring, W. Inst. chim. gen., Liege. Rec. trav. chim. (1910), 29, 163-72; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Solns. of a number of ... [more ▼]

By Spring, W. Inst. chim. gen., Liege. Rec. trav. chim. (1910), 29, 163-72; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Solns. of a number of salts (KNO3, KBr, Na2SO4, K2Cr2O7, ZnSO4, CuCl2, CuSO4, MnCl2, AlCl3, etc.) prepared in 1905 and kept at ordinary temp. from the action of direct sunlight were examined at intervals during the following four years and were found to become more and more transparent. The degree of transparency was judged by the degree of luminosity in the soln. of a beam of light projected through it by an electric lantern (50 volts and 12 amp.). To ascertain if there had been any molecular change in the solns., during the four years the conductivities of the original and the four year old solns. were determined and compared. The cond. of the original solns. was determined from portions of the 4-year-old solns. which had been evaporated to dryness and redissolved to the original vol. In the majority of cases the 4-year-old solns. showed markedly smaller conds. This may be explained by a hydrolysis of the salt which occurs when the soln. is first made. The "hydrate" [hydroxide?] thus formed is in a colloidal condition and does not affect the electrical resistance; this colloidal soln. by reflection renders more luminous a beam of light passed through the soln. The free acid initially present is the cause of the high conductivity of the solution. In the old solns. the colloidal hydrate and the free acid have greatly decreased, and the conductivity is therefore smaller than before. The state of equilibrium of such a hydrolysis, when once displaced by change of temp., etc., is restored very slowly. The soln. becomes more optically transparent owing to the gradual disappearance of the colloidal hydrate. The K2Cr2O7 soln. alone was anomalous and showed a decrease in resistance of almost one-half on standing four years. This soln. had become yellow, but on evaporating the soln. and redissolving to the same vol. the color was reddish yellow as in the original soln. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailEinige Beobachtungen über die Waschwirkung der Seifen : Zweite Mitteilung
Spring, Walthère ULg

in Zeitschrift für Chemie und Industrie der Kolloide (1910), 6

Spring, W. Luttich. Z. Chem. Ind. Kolloide (1910), 6, 11-7,109-11,164-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Study of the action of ... [more ▼]

Spring, W. Luttich. Z. Chem. Ind. Kolloide (1910), 6, 11-7,109-11,164-8; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Study of the action of hydrated iron oxide, 7Fe2O3.3H2O on soap soln. of varying conc. led to the conclusions that the optimum suspension conc. of the soap soln. is 0.5%, that the soap splits into a basic and acid part, the basic combining with the Fe2O3 and the acid part remaining in soln., and that a soap soln. will remove Fe2O3 from its adsorption compds. with cellulose. Substituting an Fe hydrosol for the Fe2O3 it was found that pptn. occurred between limiting ratios of the soap to hydrosol, i. e., between 1 of soap to 2.16 of Fe2O3 and 1 of soap to 3.47 Fe2O3. The pptn. of Al2O3, with soap soln. shows a periodicity, the ratios of soap to Al2O3 in those solns. which become clear being approx. 8.33, 4.16, 2.06. If the wt. of Al2O3. exceeds that of the soap no pptn. occurs. A large excess of soap, 20 times the wt. of Al2O3, gives a suspension optimum, whereas 80 times the wt. of Al2O3 gives pptn. The speed of the reaction depends primarily on the ratio of the reacting substances. 7SiO2.3H2O combines with a basic constituent of soap, leaving an acid constituent of low ash in soln. The % of ash in the soap in soln. increases when more dil. soap solns. are used, due to soln. of SiO2. The adsorption compd. of basic soap with SiO2 dissociates on shaking with H2O. A pptn. optimum occurs at 1/8% soap soln., and a suspension optimum at 1/16 and 1/2%. A hydrated clay gave approx. the same results, pptg. about 60% of the soap from a 1/2% soln. The soap has a solvent action on the clay, a 1/8% soap soln. giving the highest ratio of suspended clay to soap. A suspension optimum for the settling of clay in soap soln. is found at 1/32% soap soln. Cellulose forms an adsorption compd. with the basic constituents of soap, the cleavage of the soap being noticeable only in concs. above 1%. The cleansing action of soap is due to the formation of an adsorption compd. with the material to be removed, which thus loses its adhesive properties. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailSur une modification lente de la constitution des solutions de certains sels
Spring, Walthère ULg

in Archives des Sciences Physiques et Naturelles (1910), 29

Spring, Archives des Sciences Physiques et Naturelles (1910), 29, 145-56; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Solns. of a number of ... [more ▼]

Spring, Archives des Sciences Physiques et Naturelles (1910), 29, 145-56; SciFinder (Chemical Abstracts Service: Columbus, OH); https://scifinder.cas.org (accessed July 8, 2010). Solns. of a number of salts (KNO3, KBr, Na2SO4, K2Cr2O7, ZnSO4, CuCl2, CuSO4, MnCl2, AlCl3, etc.) prepared in 1905 and kept at ordinary temp. from the action of direct sunlight were examined at intervals during the following four years and were found to become more and more transparent. The degree of transparency was judged by the degree of luminosity in the soln. of a beam of light projected through it by an electric lantern (50 volts and 12 amp.). To ascertain if there had been any molecular change in the solns., during the four years the conductivities of the original and the four year old solns. were determined and compared. The cond. of the original solns. was determined from portions of the 4-year-old solns. which had been evaporated to dryness and redissolved to the original vol. In the majority of cases the 4-year-old solns. showed markedly smaller conds. This may be explained by a hydrolysis of the salt which occurs when the soln. is first made. The "hydrate" [hydroxide?] thus formed is in a colloidal condition and does not affect the electrical resistance; this colloidal soln. by reflection renders more luminous a beam of light passed through the soln. The free acid initially present is the cause of the high conductivity of the solution. In the old solns. the colloidal hydrate and the free acid have greatly decreased, and the conductivity is therefore smaller than before. The state of equilibrium of such a hydrolysis, when once displaced by change of temp., etc., is restored very slowly. The soln. becomes more optically transparent owing to the gradual disappearance of the colloidal hydrate. The K2Cr2O7 soln. alone was anomalous and showed a decrease in resistance of almost one-half on standing four years. This soln. had become yellow, but on evaporating the soln. and redissolving to the same vol. the color was reddish yellow as in the original soln. Reprinted with the permission of the American Chemical Society. Copyright © 2010. American Chemical Society (ACS). All Rights Reserved. [less ▲]

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See detailLa cité de Liège au moyen âge
Kurth, Godefroid ULg

Book published by Dewit, Cormaux et Demarteau (1910)

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See detailLes progrès de la cytologie
Gravis, Auguste ULg

Speech (1910)

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See detailEdouard Van Beneden
Fredericq, Léon ULg

in Revue Générale des Sciences Pures et Appliquées (1910)

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See detailOver mimetismus
Fredericq, Léon ULg

in Vlaamse Gids (De) (1910), VI

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See detailCompte-rendu du VIIIe Congrès international de physiologie (Vienne, 27-30 septembre 1910)
Fredericq, Léon ULg

in Archives Internationales de Physiologie (1910)

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See detailEléments de physiologie humaine à l’usage des étudiants en médecine
Fredericq, Léon ULg; Nuel, J. P.

Learning material (1910)

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See detailDie Sekretion von Schutz- und Nutzstoffen
Fredericq, Léon ULg

in Winterstein, Hans (Ed.) Handbuch der vergleichenden Physiologie (1910)

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