Academic literature on the topic 'Borinic acids'

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Journal articles on the topic "Borinic acids":

1

Boyet, Marion, Laurent Chabaud, and Mathieu Pucheault. "Recent Advances in the Synthesis of Borinic Acid Derivatives." Molecules 28, no. 6 (March 15, 2023): 2660. http://dx.doi.org/10.3390/molecules28062660.

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Borinic acids [R2B(OH)] and their chelate derivatives are a subclass of organoborane compounds used in cross-coupling reactions, catalysis, medicinal chemistry, polymer or optoelectronics materials. In this paper, we review the recent advances in the synthesis of diarylborinic acids and their four-coordinated analogs. The main strategies to build up borinic acids rely either on the addition of organometallic reagents to boranes (B(OR)3, BX3, aminoborane, arylboronic esters) or the reaction of triarylboranes with a ligand (diol, amino alcohol, etc.). After general practical considerations of borinic acids, an overview of the main synthetic methods, their scope and limitations is provided. We also discuss some mechanistic aspects.
2

Chudzinski, Michael G., Yuechuan Chi, and Mark S. Taylor. "Borinic Acids: A Neglected Class of Organoboron Compounds for Recognition of Diols in Aqueous Solution." Australian Journal of Chemistry 64, no. 11 (2011): 1466. http://dx.doi.org/10.1071/ch11294.

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Association constants between diphenylborinic acid and representative analytes capable of reversible two-point covalent binding (diols, catechols, and hydroxy acids) were determined using an indicator-displacement assay. Unlike boronic acids, which have been studied in great detail as receptors for diols and related compounds, borinic acids have effectively been ignored as candidates for such applications. The results of this study indicate that diphenylborinic acid displays high affinity for certain analytes of this type in aqueous solution. Of particular interest are differences between the selectivity of the borinic acid and that of a boronic acid of similar pKa towards the series of analytes studied: the borinic acid displays an unusually high level of discrimination for catechols over carbohydrates. The distinct selectivity observed, and the unique opportunities for steric and electronic tuning of diarylborinic acids, suggest that these compounds hold significant potential for applications in aqueous-phase molecular recognition.
3

Marciasini, Ludovic, Bastien Cacciuttolo, Michel Vaultier, and Mathieu Pucheault. "Synthesis of Borinic Acids and Borinate Adducts Using Diisopropylaminoborane." Organic Letters 17, no. 14 (July 6, 2015): 3532–35. http://dx.doi.org/10.1021/acs.orglett.5b01620.

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4

García, Antonio Abad, Alexey Rayevsky, E. Andrade-Jorge, and José G. Trujillo-Ferrara. "Structural and Biological Overview of Boron-containing Amino Acids in the Medicinal Chemistry Field." Current Medicinal Chemistry 26, no. 26 (October 22, 2019): 5077–89. http://dx.doi.org/10.2174/0929867325666180926150403.

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Background: Amino acids are the basic structural units of proteins as well as the precursors of many compounds with biological activity. The addition of boron reportedly induces changes in the chemical-biological profile of amino acids. Methods: We compiled information on the biological effect of some compounds and discussed the structure-activity relationship of the addition of boron. The specific focus presently is on borinic derivatives of α-amino acids, the specific changes in biological activity caused by the addition of a boron-containing moiety, and the identification of some attractive compounds for testing as potential new drugs. Results: Borinic derivatives of α-amino acids have been widely synthesized and tested as potential new therapeutic tools. The B-N (1.65 A°) or B-C (1.61 A°) or B-O (1.50 A°) bond is often key for the stability at different pHs and temperatures and activity of these compounds. The chemical features of synthesized derivatives, such as the specific moieties and the logP, polarizability and position of the boron atom are clearly linked to their pharmacodynamic and pharmacokinetic profiles. Some mechanisms of action have been suggested or demonstrated, while those responsible for other effects remain unknown. Conclusion: The increasing number of synthetic borinic derivatives of α-amino acids as well as the recently reported crystal structures are providing new insights into the stability of these compounds at different pHs and temperatures, their interactions on drug targets, and the ring formation of five-membered heterocycles. Further research is required to clarify the ways to achieve specific synthesis, the mechanisms involved in the observed biological effect, and the toxicological profile of this type of boron-containing compounds (BCCs).
5

Ouadoudi, Omar, Tanja Kaehler, Michael Bolte, Hans-Wolfram Lerner, and Matthias Wagner. "One tool to bring them all: Au-catalyzed synthesis of B,O- and B,N-doped PAHs from boronic and borinic acids." Chemical Science 12, no. 16 (2021): 5898–909. http://dx.doi.org/10.1039/d1sc00543j.

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Singly and doubly B,E-doped PAHs were synthesized using a protocol that starts from easy-to-handle boronic and borinic acids and offers the possibility to choose between the preparation of B,O- and B,N-PAHs in the final reaction step.
6

Le Coz, Erwann, Ziyun Zhang, Thierry Roisnel, Luigi Cavallo, Laura Falivene, Jean‐François Carpentier, and Yann Sarazin. "Barium‐Catalysed Dehydrocoupling of Hydrosilanes and Borinic Acids: A Mechanistic Insight." Chemistry – A European Journal 26, no. 16 (March 18, 2020): 3535–44. http://dx.doi.org/10.1002/chem.201904933.

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Le Coz, Erwann, Ziyun Zhang, Thierry Roisnel, Luigi Cavallo, Laura Falivene, Jean‐François Carpentier, and Yann Sarazin. "Barium‐Catalysed Dehydrocoupling of Hydrosilanes and Borinic Acids: A Mechanistic Insight." Chemistry – A European Journal 26, no. 16 (March 18, 2020): 3445. http://dx.doi.org/10.1002/chem.202000478.

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8

Hubrich, Jonathan, Thomas Himmler, Lars Rodefeld, and Lutz Ackermann. "Ruthenium(II)-Catalyzed CH Arylation of Anilides with Boronic Acids, Borinic Acids and Potassium Trifluoroborates." Advanced Synthesis & Catalysis 357, no. 2-3 (January 19, 2015): 474–80. http://dx.doi.org/10.1002/adsc.201400906.

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Hubrich, Jonathan, Thomas Himmler, Lars Rodefeld, and Lutz Ackermann. "ChemInform Abstract: Ruthenium(II)-Catalyzed C-H Arylation of Anilides with Boronic Acids, Borinic Acids and Potassium Trifluoroborates." ChemInform 46, no. 26 (June 2015): no. http://dx.doi.org/10.1002/chin.201526113.

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10

Cole, Thomas E., Ramona Quintanilla, Brian M. Smith, and David Hurst. "Simple conversion of anhydrides of boronic and borinic acids to the corresponding organodihaloboranes and diorganohaloboranes." Tetrahedron Letters 33, no. 20 (May 1992): 2761–64. http://dx.doi.org/10.1016/s0040-4039(00)78851-4.

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Dissertations / Theses on the topic "Borinic acids":

1

Bonnard, Mélanie. "Vitrimères boriniques : synthèses et applications." Electronic Thesis or Diss., Bordeaux, 2024. http://www.theses.fr/2024BORD0051.

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Les vitrimères représentent une classe novatrice de polymères dévoilée par le Professeur Leibler et ses collègues en 2011. Ils définissent les vitrimères comme étant des « réseaux polymères capables de modifier leur topologie tout en conservant un nombre constant de liaisons chimiques ». Ces matériaux se distinguent par leur aptitude à fusionner les caractéristiques des thermoplastiques (réutilisabilité) et des thermodurcissables (propriétés thermomécaniques et résistance chimique supérieure) grâce à un réseau chimique incorporant des liaisons covalentes dynamiques. Des réactions d'échange telles que la transestérification boronique dans les vitrimères ont été documentées, mettant en lumière la remarquable propriété de la liaison B-O échangeable sans catalyseur. Bien que des vitrimères contenant des monomères d'acides boroniques aient été élaborés, aucune publication n'a jusqu'à présent exposé l'utilisation d'acides boriniques dans ces matériaux. La synthèse d'acides boriniques non symétriques est une tâche complexe, cependant, leur complexation avec des aminoalcools permet de les isoler sous forme d'aminoborinates, dans lesquels l'atome de bore est stabilisé par la paire d'électrons non liants de l'azote. Ces composés pourraient ouvrir la voie à des vitrimères présentant une liaison B–N plus labile que la liaison B–O des esters d'acides boroniques. L'objectif principal de ce projet est de concevoir de nouveaux dérivés d'acides boriniques fonctionnalisés pouvant être utilisés comme monomères ou agents réticulants dans les vitrimères. Ce document décrit la synthèse et l'utilisation de borinates non symétriques à travers une stratégie divergente. Ces composés ont ensuite été employés dans des réactions de post-fonctionnalisation telles que la cycloaddition 1,3-dipolaire et la condensation de Knoevenagel. Ces post-fonctionnalisations visent à générer des structures aptes à être incorporées dans des copolymères pour évaluer la formation de vitrimères
Vitrimers represent an innovative class of polymers introduced by Professor Leibler and colleagues in 2011. They define vitrimers as polymer networks capable of modifying their topology while maintaining a constant number of chemical bonds. These materials distinguish themselves by their ability to merge the characteristics of thermoplastics (reusability) and thermosets (superior thermomechanical properties and chemical resistance) through a chemical network incorporating dynamic covalent bonds. Exchange reactions such as boronic transesterification in vitrimers have been documented, highlighting the remarkable property of the B–O bond exchangeable without a catalyst. Although vitrimers containing boronic acid monomers have been developed, no publication has yet exposed the use of borinic acids in these materials. The synthesis of non-symmetric borinic acids is a complex task, however, their complexation with aminoalcohols allows their isolation in the form of aminoborinates, where the boron atom is stabilized by the lone pair of nitrogen electrons. These compounds could pave the way for vitrimers featuring an B–N bond more labile than the B–O bond in boronic acid esters. The main objective of this project is to design new functionalized borinic acid derivatives that can be used as monomers or crosslinking agents in vitrimers. This document describes the synthesis and utilization of non-symmetric borinates through a divergent strategy. These compounds were then employed in post-functionalization reactions such as 1,3-dipolar cycloaddition and Knoevenagel condensation. This aims to generate structures suitable for incorporation into copolymers to assess vitrimer formation
2

Chardon, Aurelien. "Acides boriniques et hydrosilanes : de la spécificité vers la réactivité." Thesis, Normandie, 2017. http://www.theses.fr/2017NORMC255.

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L’utilisation des acides de Lewis dérivés du bore tels que les boranes, les acides boroniques et les acides boriniques a émergée récemment comme une alternative intéressante aux métaux de transitions dans le domaine de la catalyse. Lors des travaux précédemment effectués au laboratoire par Tharwat Mohy El Dine, la synthèse d’acides boriniques originaux a été effectuée. Ces catalyseurs ont montrés une activité remarquable et supérieure aux dérivés boroniques correspondants pour la synthèse catalytique de dipeptides et la réaction de formylation d’amines. Au cours de nos travaux, il nous a été possible d’évaluer l’apport des acides boriniques pour la catalyse de la réduction des amides dans des conditions douces avec une bonne compatibilité fonctionnelle, le mécanisme réactionnel a également pu être rationnalisé. Nous avons ensuite évalué l’activité du même acide borinique pour la réaction de réduction des oxydes de phosphines, des sulfoxydes et des N-oxydes d’amines. Après une étude mécanistique portant sur le transfert d’hydrure d’un hydrosilane vers un acide borinique, l’apport des acides boriniques pour l’hydrosilylation des cétones, aldéhydes et imines a également été étudié. Une méthodologie coopérative entre un hydrosilane et un acide borinique pour la catalyse de la réaction d’amidation a été développée. Enfin, une étude théorique utilisant la RMN et la DFT a permis de rationnaliser la relation structure activité de nos catalyseurs. L’ensemble de ces travaux confirme le potentiel des acides boriniques en tant que catalyseurs efficaces pour de nombreuses réactions
Boron based Lewis acid such as borane, boronic and borinic acids, has recently emerged as a strong alternative to transition metal catalysts for catalysis. During Tharwat Mody El Dine thesis, a range of original borinic acids have been synthetized. These catalysts have been used to investigate catalytic peptides synthesis and amines formylation. This thesis work with aimed the association between borinic acids and hydrosilanes for organic synthesis. In the first part a borinic acid catalyzed amides reductions have been developed, our methodology work in mild conditions and displayed high chemoselectivities. In a second chapter, we will study the activity of borinic acids for the reduction of phosphine oxides, sulfoxides and amine N-oxide. After a study on the formation of previously observed amine-borane, a borinic acid mediated ketones, aldehydes and imines hydrosilylation have been demonstrated in the third chapter. In the fourth chapter a cooperative borinic acid-hydrosilane mediated amide bond formation has been developed, the mild conditions and the absence of racemization appear as the keys elements of this methodology. Finally, RMN and DFT instruments have been used to understand the relationship between structure and reactivity of borinic acids.All this study confirms the potential of borinic acids as efficient metal-free catalysts in many organic transformations.Mots clés : catalyse, acide borinique, hydrosilane, réduction, amides
3

Birepinte, Mélodie. "Amino(organo)boranes, synthèse et propriétés." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0231.

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Ce manuscrit présente la synthèse, la réactivité et les propriétés des amino(organo)boranes. Le diisopropylaminoborane a été utilisé dans le cadre de la formation de liaisons carbone-bore. La réactivité du diisopropylaminoborane en tant qu’agent de borylation a d’abord été mise à profit pour l’hydroboration des alcynes catalysée par le réactif de Schwartz. Une grande variété d’alcénylaminoboranes, -boronates et -diazaborolanes a ainsi été synthétisée. Leur transformation stéréosélective en bromoalcènes Z et E a également été optimisée. La borylation des alcynes vrais via un procédé tandem de déshydrogénation / couplage déshydrogénant a permis l’accès à une grande variété d’alcynylaminoboranes. Enfin, les différentes réactivités des aminoboranes ont été mises à profit dans la préparation d’acides boriniques comportant une fonction phosphine, ainsi que d’ une nouvelle classe de dérivés du bore chiraux par atropoisomérie autour de la liaison C-B. Ces aminoarylboranes chiraux ont été caractérisés par séparation des énantiomères complétée d’études spectroscopiques et de racémisation
This manuscript presents the synthesis, reactivity and properties of amino(organo)boranes. The diisopropylaminoborane has been used for the formation of carbon-boron bonds. Its reactivity as a borylating agent was first explored for the hydroboration of alkynes catalyzed by Schwartz reageant. A large variety of alkenylaminoboranes, -boronates and -diazaborolanes was thus synthesized. Their stereoselective transformation into E and Z bromoalkenes was also optimized. The borylation of terminal alkynes via a tandem process of dehydrogenation/ dehydrogenative coupling allowed the access to a large scope of alkynylaminoboranes. Finally, the different reactivities of aminoboranes were used for the preparation of borinic acids bearing a phosphine group but also of a new class of chiral boron derivatives via a C-B atropisomerism. These chiral aminoarylboranes were fully characterized after separating the enantiomers and running spectroscopic analyses and racemization studies
4

Cree, Alistair Murray. "Fatigue in boric acid-sulphuric acid anodised aluminium alloys." Thesis, Open University, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247058.

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5

Dervisoglu, Ozgecan. "Inferential Control Of Boric Acid Production System." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/2/12608766/index.pdf.

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Inferential control of boric acid production system using the reaction of colemanite with sulfuric acid in four continuously stirred tank reactors (CSTR) connected in series is aimed. In this control scheme, pH of the product is measured on-line instead of boric acid concentration for control purposes. An empirical correlation between pH and boric acid concentration is developed using the collected data in a batch reacting system in laboratory-scale and this correlation is utilized in the control system for estimator design. The transfer function model of the 4-CSTR system previously obtained is used in the MPC controller design. In the experiments done previously for the modelling of 4-CSTR system, it was observed that the reaction goes complete within the first reactor. Therefore, the control is based on the measurements of pH of the second reactor by manipulating the flow rate of sulfuric acid given to the first reactor, while the flow rate of colemanite fed to the system is considered as disturbance. The designed controller&rsquo
s performance is tested for set point tracking, disturbance rejection and robustness issues using a simulation program. It is found that, the designed controller is performing satisfactorily, using the inferential control strategy for this complex reacting system.
6

Efhamisisi, Davood. "Preservation of plywood against biological attack with low environmental impact using tannin-boron preservative." Thesis, Montpellier, 2015. http://www.theses.fr/2015MONTS235/document.

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Une étude expérimentale a été menée afin de protéger des attaques biologiques des contreplaqués faits d'essences non durables (hêtre et peuplier), et ce, avec un faible impact environnemental. Des produits de protection à base de tannins et de bore, nouvellement développés afin de réduire le lessivage du bore, ont été sélectionnés pour ce but. Ce système a été utilisé pour protéger les contreplaqués selon deux approches : (1) au niveau de la colle pour remplacer les adhésives à base de formaldéhyde et coller les plis, (2) en traitement des plis avec des formulations plus diluées, les plis étant collés avec des adhésifs mélamine-urée-formaldéhyde. Les données expérimentales de cette thèse peuvent être classées en trois grands groupes : essais chimiques et thermomécaniques des colles tannin-bore, mesure des propriétés physiques et mécaniques, de la résistance biologique avant et après vieillissement des différents panneaux. Les essais chimiques sur les colles tannin/hexamine ont montré que l'addition de bore sous forme d'acide borique peut contribuer à plus de liaisons inter-flavonoids et à ouvrir les cycles pyranes ce qui accélère les réactions de polymérisation. Des analyses thermomécaniques sur les colles contenant des tannins de mimosa et de quebracho ont confirmé que l'addition d'acide borique (1) abaissait le temps et la température de prise, et (2) augmentait les valeurs du module d'élasticité de la colle. L'addition d'une quantité optimale d'acide borique dans la colle à base de tannin augmente les propriétés physiques et la résistance au cisaillement. Une charge excessive d'acide borique (10%) dans la colle est la cause de pertes de propriétés mécaniques et physiques. Bien qu'en faible quantité, l'introduction de l'acide borique dans la colle de tannin amène une protection efficace contre l'attaque fongique, même après un lessivage selon l'EN 1250-2. Les résultats des essais termites montrent que l'acide borique contenu dans la colle cause le plus faible taux de survie des insectes et de perte de masse, mais présentent un fort degré d'attaque selon une cotation visuelle. Aucune amélioration n'a été obtenue lors d'un essai de choix après lessivage. Les contreplaqués faits de plis traités par des solutions tannin-bore ont montré des résistances au cisaillement plus faibles, mais toujours dans les gammes requises pour des applications en atmosphère humide. Des résultats satisfaisants ont été obtenus par les réseaux polymères de tannins, même après une lessivage sévère, vis-à-vis de l'attaque fongique. Les contreplaqués faits de plis traités à l'acide borique seul ont présenté une sensibilité importante à l'attaque biologique après un lessivage. Les résultats des essais termites ont montré un faible taux de survie des insectes et de perte de masse, même après un lessivage sévère, pour les contreplaqués avec des plis traités par des systèmes tannin-bore. Les résultats d'un essai de choix a montré que les termites préféraient se nourrir des témoins quand l'alternative proposée était des échantillons traités avec des systèmes tannin-bore
An experimental investigation was conducted to protect plywood panels made of perishable wood species (beech and poplar) against biological attacks with low environmental impact. The newly developed tannin-boron preservative which was proposed to reduce the leaching of borates was selected for this purpose. This system was used to protect plywood with two approaches: (1) in the glue line to replace formaldehyde based adhesives and gluing wood veneers, (2) pretreatment of wood veneers with the diluted formulations and bonded with melamine-urea-formaldehyde resin The research data in this thesis were obtained from three main groups of experiments: chemicals and thermomechanical testing on the tannin-boron resin, measuring physical and mechanical properties, and different biological tests before and after leaching processes. The chemicals testing on the tannin/hexamine adhesive showed that the addition ofboron, in the form of boric acid, can contribute more inter-flavonoid linkages and the opening of pyran rings which leads to the acceleration of polymerization reactions. Thermomechanical analysis on the adhesives of mimosa and quebracheo tannins confirmed that the addition of boric acid (1) lowered time and temperature of hardening, (2) and increased modulus of elasticity values of the adhesive. The addition of optimal boric acid into the tannin adhesive upgraded physical properties and tensile shear strength. An excess loading of boric acid (10%) in the glue line caused imperfect physical and mechanical features. Despite the low uptake of boric acid but its addition into the tannin glue provided effective resistance against fungal attack even after mild leaching test according to the EN 1250-2. The results of termites test showed that increase in the boric acid content of the adhesive caused the lower survival rate and the weight loss but samples underwent the high level of attack. No improvement against termite attack was obtained after leaching by a choice feeding test. The plywoods made of pretreated veneers by tannin-boron solutions showed partially lower tensile shear strength but still in the range of standards requirements for the humid applications. The satisfactory results were obtained even after severe leaching test against fungal attack with a strong polymeric network of tannin. The control plywoods made of pretreated veneers with boric acid alone solutions presented significant sensitivity against biological attack after leaching test. The results of termite tests showed the lower survival rate and the weight loss even after severe leaching test for the plywoods made of pretreated veneers with tannin-boron systems. The results of choice feeding test showed that termites preferred feeding from the controls when alternative samples were treated with the tannin-boron system. In general the evidence from this study suggests that tannin-boron system can significantly slow down the leaching of boron and it rendered high potential to preserve plywood
7

Zakharova, K., A. Mednikova, V. Rumyantsev, and T. Genusova. "Synthesis of Boron Carbide from Boric Acid and Carbon-Containing Precursors." Thesis, Sumy State University, 2013. http://essuir.sumdu.edu.ua/handle/123456789/35601.

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The paper compares low-temperature techniques for boron carbide synthesis. Boron carbide was syn-thesized via reaction between boric acid and various carbon precursors, e.g. phenol-formaldehyde resin, su-crose, carbon black, and potato starch. Initial compositions and carbon precursor preparation techniques were selected for synthesis. The resulting products were characterized by IR spectrometry, X-ray diffrac-tion (XRD) and scanning electron microscopy. Possible boron carbide yields up to 95 % of the theoretical yield as calculated from initial boron contents at temperatures of 1550 oС were demonstrated. XRD con-firmed that the synthesized boron carbide (B4C) has a rhombohedral crystalline structure. Final product morphology may be tailored, ranging from isometric to needle-like crystallite morphology. Nanopowders as processed via high-energy milling may be further used as sintering additive for processing of boron carbide ceramics. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/35601
8

Yucel, Cakal Gaye O. "Dynamic Behavior Of Continuous Flow Stirred Slurry Reactors In Boric Acid Production." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605047/index.pdf.

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One of the most important boron minerals, colemanite is reacted with sulfuric acid to produce boric acid. During this reaction, gypsum (calcium sulfate dihydrate) is formed as a byproduct. In this study, the boric acid production was handled both in a batch and four continuously stirred slurry reactors (4-CFSSR&rsquo
s) in series system. In this reaction system there are at least three phases, one liquid and two solid phases (colemanite and gypsum). In a batch reactor all the phases have the same operating time (residence time), whereas in a continuous reactor all the phases may have different residence time distributions. The residence time of both the reactant and the product solids are very important because they affect the dissolution conversion of colemanite and the growth of gypsum crystals. The main aim of this study was to investigate the dynamic behavior of continuous flow stirred slurry reactors. By obtaining the residence time distribution of the solid and liquid components, the non-idealities in the reactors can be found. The experiments performed in the continuous flow stirred slurry reactors showed that the reactors to be used during the boric acid production experiments approached an ideal CSTR in the range of the stirring rate (500-750 rpm) studied. The steady state performance of the continuous flow stirred slurry reactors (CFSSR&rsquo
s) in series was also studied. During the studies, two colemanites having the same origin but different compositions and particle sizes were used. The boric acid production reaction consists of two simultaneous reactions, dissolution of colemanite and crystallization of gypsum. The dissolution of colemanite and the gypsum formation was followed from the boric acid and calcium ion concentrations, respectively. The effect of initial CaO/ SO42- molar ratio (1.00, 1.37 and 2.17) on the boric acid and calcium ion concentrations were searched. Also, at these initial molar ratios the colemanite feed rate was varied (5, 7.5, 10 and 15 g/min) to change the residence time of the slurry. Purity of the boric acid solution was examined in terms of the selected impurities, which were the magnesium and sulfate ion concentrations. The concentrations of them were compared at the initial molar ratios of 1.00 and 1.37 with varying colemanite feed rates. It was seen that at high initial CaO/ SO42- molar ratios the sulfate and magnesium ion concentrations decreased but the calcium ion concentration increased. The gypsum crystals formed in the reaction are in the shape of thin needles. These crystals, mixed with the insolubles coming from the mineral, are removed from the boric acid slurry by filtration. Filtration of gypsum crystals has an important role in boric acid production reaction because it affects the efficiency, purity and crystallization of boric acid. These crystals must grow to an appropriate size in the reactor. The growth process of gypsum crystals should be synchronized with the dissolution reaction. The effect of solid hold-up (0.04&ndash
0.09), defined as the volume of solid to the total volume, on the residence time of gypsum crystals was investigated and the change of the residence time (17-60 min) on the growth of the gypsum was searched. The residence time at each reactor was kept constant in each experiment as the volumes of the reactors were equal. The growth of gypsum was examined by a laser diffraction particle size analyzer and the volume weighted mean diameters of the gypsum crystals were obtained. The views of the crystals were taken under a light microscope. It was observed that the high residence time had a positive effect on the growth of gypsum crystals. The crystals had volume weighted mean diameters of even 240 µ
m. The gypsum crystal growth model was obtained by using the second order crystallization reaction rate equation. The residence time of the continuous reactors are used together with the gypsum growth model to simulate the continuous boric acid reactors with macrofluid and microfluid models. The selected residence times (20-240 min) were modeled for different number of CSTR&rsquo
s (1-8) and the PFR. The simulated models were, then verified with the experimental data. The experimentally found calcium ion concentrations checked with the concentrations found from the microfluid model. It was also calculated that the experimental data fitted the microfluid model with a deviation of 4-7%.
9

Ström, Simon. "Boric acid as a lubricating additive in fuels and in hydraulic oils." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-356795.

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Boric acid based fuel and oil additives were investigated in this study, with the aims to gain a deeper understanding of how the boric acid fuel additive behaves, to investigate the effect of low rates of fuel additive addition and tribofilm longevity, and to investigate how boric acid behaves as a hydraulic oil additive. Fuel additive experiments were performed in a reciprocating sliding rig with a cylinder on flat contact geometry with fuel additive sprayed on the contact repeatedly, whereas the hydraulic oil experiments were performed in a reciprocating sliding rig with a ball on flat contact with the oil and additive present from the start. Analysis was performed using vertical scanning interferometry (VSI), scanning electron microscopy (SEM) and energy dispersive x-ray spectroscopy (EDS). The tribofilms created by the fuel additive provided excellent friction reduction capabilities, even with low or no rate of replenishment. As more additive was sprayed, wear resistance seemed to increase as the surface became increasingly covered. Film coverage need to be less than 20% of the surface in order to gain full friction reducing effects. The hydraulic oil additive had little effect on friction or wear resistance under the used parameters and no tribofilm was found.
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Marciasini, Ludovic. "Le diisopropylaminoborane : un agent de borylation alternatif pour la pformation de liaison carbone-bore. Etude de réactivité et développement de nouvelles méthodologies." Thesis, Bordeaux, 2014. http://www.theses.fr/2014BORD0216/document.

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Ce manuscrit présente l’utilisation du diisopropylaminoborane comme agent de borylation d’halogénuresd’aryles et de sels d’aryldiazonium. Cet agent de borylation a fait l’objet d’études au sein du laboratoireet de nouvelles méthodologies ont été développées. Une méthodologie générale de borylation de selsde diazonium, catalysée par des métallocènes dérivés du fer, du titane et du zirconium a étédéveloppée, permettant l’accès à des composés d’intérêt comme les halogénures d’aryles borylés. Deplus, une étude cinétique et mécanistique supportée par des calculs théoriques ont permisd’appréhender le mécanisme de cette nouvelle réaction. Une extension de la borylation catalysée aupalladium a été réalisée, permettant l’utilisation de bromures et de chlorures d’aryles ainsi qu’uneméthode de synthèse one-pot de dérivés biaryles non symétriques. Ces méthodes permettent deboryler efficacement des halogénures d’aryles en utilisant une catalyse au palladium homogène ousemi-hétérogène. Enfin, une étude de réactivité entre le diisopropylaminoborane et desorganométalliques dérivés du lithium et du magnésium a été achevée. Une méthodologie généraled’accès aux acides boriniques ainsi qu’une étude mécanistique a été réalisée
This manuscript describes the use of diisopropylaminoborane as borylating agent of aryl halides anddiazonium salts. This borylating agent has been the subject of studies in the laboratory and newmethodologies has been done. A general methodology of borylation of aryl diazonium salt catalyzed byiron, titanium and zirconium metallocene was developed, allowing access to useful compounds such ashalogenated aryl boron species. Furthermore, kinetic and mechanistic studies supported by theoreticalcalculation allowed a better understanding of the mechanism of the reaction. An extension of thepalladium catalyzed reaction was realized, allowing the use of aryl bromides and chlorides together witha new one-pot unsymetrical biaryl synthesis. Those methods allowed an efficient borylation of arylshalides using homogeneous semi-heterogeneous palladium catalyst. Finally, a study of reactivity of thediisopropylaminoborane and organometallics such as Grignard and organolithium was done. A generalmethodology was developed for the synthesis of diarylborinic acids and a mechanistic study wasachieved

Books on the topic "Borinic acids":

1

Shvart͡s, E. M. Vzaimodeĭstvie bornoĭ kisloty so spirtami i oksikislotami. Riga: Zinatne, 1990.

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1870-1925, Lang W. R., ed. The determination of boric acid, alone, and in the presence of phosphoric acid. [Toronto]: University Library, pub. by the Librarian, 1997.

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Minichino, Camille. The boric acid murder: A Gloria Lamerino mystery. Waterville, Me: Thorndike Press, 2002.

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Minichino, Camille. The boric acid murder: A Gloria Lamerino mystery. New York: Thomas Dunne Books/St. Martin's Minotaur, 2002.

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1870-1925, Lang W. R., ed. The estimation of boric acid and borates in foodstuffs and commercial products. [Toronto]: University Library, pub. by the Librarian, 1997.

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Grossman-Canfield, N. Surface interactions of cesium and boric acid with stainless steel. Washington, DC: U.S. Nuclear Regulatory Commission, 1995.

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National Toxicology Program (U.S.). NTP technical report on the toxicology and carcinogenesis studies of boric acid (CAS no. 10043-35-3) in B6C3F1 mice (feed studies). Research Triangle Park, NC: National Toxicology Program, U.S. Dept. of Health and Human Services, Public Health Service, National Institutes of Health, 1987.

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Prokofʹev, V. I︠U︡. Bor i bornye kisloty v ėndogennykh rudoobrazui︠u︡shchikh fli︠u︡idakh. Moskva: Pasʹva, 2003.

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Birchall, K. L. The stress corrosion cracking of a low alloy steel in lithiated boric acid solutions. Manchester: UMIST, 1989.

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Slevin, Joseph. Boric acid: A study of its usefulness as a bacteriostatic and fungistatic preservative for urine samples. [S.l: The Author], 1993.

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Book chapters on the topic "Borinic acids":

1

Bährle-Rapp, Marina. "Boric Acid." In Springer Lexikon Kosmetik und Körperpflege, 72. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_1274.

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Hallenbeck, William H., and Kathleen M. Cunningham-Burns. "Boric Acid." In Pesticides and Human Health, 28–29. New York, NY: Springer New York, 1985. http://dx.doi.org/10.1007/978-1-4612-5054-8_16.

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Berry, Colin, Jason M. Meyer, Marjorie A. Hoy, John B. Heppner, William Tinzaara, Clifford S. Gold, Clifford S. Gold, et al. "Boric Acid." In Encyclopedia of Entomology, 548–49. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6359-6_415.

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Gooch, Jan W. "Boric-Acid Ester." In Encyclopedic Dictionary of Polymers, 90. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_1512.

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Cattant, François. "Boric Acid Corrosion." In Materials Ageing in Light-Water Reactors, 1217–54. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-85600-7_13.

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Criscuoli, A. "Boric Acid Separation by Membrane Contactor." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-40872-4_791-1.

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Winkelmann, Jochen. "Diffusion coefficient of boric acid in water." In Diffusion in Gases, Liquids and Electrolytes, 24. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-54089-3_3.

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Pathan, Shahebaaz K., Paresh Mahaparale, Satish Deshmukh, Hemant Une, Rohidas Arote, and Jaiprakash Sangshetti. "Boric Acid: A Versatile Catalyst in Organic Synthesis." In Nanotechnology in the Life Sciences, 457–83. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44176-0_17.

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Anderson, Joanne E., Jannine Cobb, Roman Davis, Peter J. Dunn, Russ N. Fitzgerald, and Alan J. Pettman. "Industrial Applications of Boric Acid And Boronic Acid-Catalyzed Direct Amidation Reactions." In Sustainable Catalysis, 111–20. Hoboken, New Jersey: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118354520.ch06.

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Liu, Yan, Xiaojing Liu, Sijia Du, Jiageng Wang, and Hui He. "Multi-Physics Coupling Model for Thermal Hydraulics and Solute Transport in CRUD Deposits." In Springer Proceedings in Physics, 396–411. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_35.

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AbstractThe porous Chalk River Unidentified Deposit (CRUD) depositions on the fuel cladding have a great impact on the heat transfer and power distribution of the reactor, resulting in a decrease in reactor safety and economy. In current paper, a multi-physics model is developed to simulate thermal hydraulics and boron hideout within the CRUD depositions. Processes including heat transfer, pressure drop, capillary flow, solute transport, chemical reactions and radiolysis reactions are fully coupled. The coolant flows through the capillary tubes in the porous medium and evaporates into steam at the surface of chimneys. The solute diffuses into the porous medium by capillary flow and maintains its chemical equilibrium. Chemistry and thermal hydraulics are coupled by saturation temperature that varies with solute concentrations. The new model can reasonably predict the distributions of temperature, pressure, Darcy velocity and chemical concentrations. This model shows the effect of evaporation at the chimney surface on CRUD temperature and boric acid concentration. In addition, the results show that boron hideout is caused by the accumulation of boric acid and the precipitation of Li2B4O7 at the bottom of CRUD. The influence of morphology parameters such as porosity, thickness, and chimney geometry on heat transfer and solute transport within CRUD depositions is also evaluated.

Conference papers on the topic "Borinic acids":

1

"Kinetics of Boric Acid Dissolution." In 2023 4th International Scientific Conference "Chemical Technology and Engineering". Lviv Polytechnic National University, 2023. http://dx.doi.org/10.23939/cte2023.087.

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Kabir, M. A., C. F. Higgs, and M. Lovell. "Development of a Novel Green Lubricant for Sheet Metal Forming Operation." In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44289.

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The main purpose of the present investigation is to analyze a novel, green, and petroleum-free lubricant that is produced by mixing two environmentally benign components—canola oil and boric acid powder. To study the influence of boric acid crystal size and volume ratio on the proposed lubricants performance, computerized pin on disk experiments were conducted with spherical copper pins (radius 6.5 mm) and aluminum disks (Ra = 1.35μm). Friction coefficient measurements were taken at more than twenty distinct operating conditions while varying the lubrication condition (unlubricated, boric acid, canola oil, boric acid/canola oil mixture), boric acid volume fraction (3.5%, 7%, 10.5 and 21%), and boric acid crystal size (0–100 microns, 100–150 microns, 150–180 microns, 180–350 microns and 350–710 microns). Based on the experiments, it was determined that a 7% by volume boric acid powder in canola oil with 350–700 micron particles was the optimum green lubricant for minimizing the friction at the conditions tested. In addition, the results indicated that the boric acid/canola oil lubricant demonstrated excellent potential for use in industrial applications such as sheet metal stamping.
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Kabir, M. A., C. F. Higgs, and M. Lovell. "Tribological Performance of Sub-Micron Scale Boric Acid Powder Additives for Extended Duration." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71261.

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In this investigation, the friction and wear performance of sub-micron scale boric acid powder lubricant additives were studied during extended duration pin-on-disk experiments. The sub-micron (600 nm) and micro (4 μm) powder additives were created from 250 micron sized crystals using an 1800D SPEX Mill/Mixer. Lubricant combinations were prepared by homogeneously mixing the additives with canola oil in a vortex generator. Three different boric acid additives were investigated by combining 5.0 wt. % of 4 μm boric acid particles, 5.0 wt % of 600 nm sized boric acid particles, and a 5.0 wt % mixture of the 4 μm (2.5 wt. %) and 600 nm (2.5 wt. %) boric acid particles. A fourth additive, 5.0 wt. % of 0.5 – 5μm MoS2 powder, was also purchased and mixed with the canola oil to form a basis for comparison. It was determined that the oil mixed with a combination of micro and sub-micron scale boric acid powder additives exhibited better frictional performance than the oil mixed with micro or sub-micron boric acid additives.
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Koop, Rodney, and Yukimori Moji. "Boric/Sulfuric Acid Anodize-Alternative to Chromic Acid Anodize." In Airframe Finishing, Maintenance & Repair Conference & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1992. http://dx.doi.org/10.4271/920944.

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Zhang, Xinyu, Bing Dong, Hui Yang, Wentao Zhou, and Dezhong Wang. "Simulation and Experimental Verification of Boron Diffusion and Mixing in T-Tube Flow." In 2022 29th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/icone29-92341.

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Abstract 10B has a high neutron absorption cross section, so boric acid is generally used as a neutron absorber for reactor control. During an emergency of a nuclear power system, boric acid water is injected into the reactor core by safety injection system to shut down the reactor. Boron concentration has an important impact on the operation safety of the power plant. The mixing process of boric acid and water is influenced by diffusion, convection and turbulence. A new laser-induced fluorescence method is proposed, which can accurately and quickly measure the concentration field of boric acid. This paper introduces the measurement method and the experimental study of boric acid diffusion in T-tube, and compares it with the measurement of wire mesh sensor. In addition, the CFD method is used to calculate the experimental conditions. The results obtained by the three methods were compared with each other, and the diffusion law and research of boric acid are obtained. This study can provide a certain basis for the follow-up study of boron diffusion.
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Parada, Corey, William Corbin, and Erica Redline. "Sustainable Functional Epoxies through Boric Acid Templating ." In Proposed for presentation at the American Chemical Society held March 22-25, 2022 in San Diego, California United States of America. US DOE, 2022. http://dx.doi.org/10.2172/2001974.

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Terrell, Elon J., and C. Fred Higgs. "Multi-Phase Modeling of Journal Bearing With Oil and Boric Acid Lubricant." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71297.

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Past studies have shown that oil lubricants with boric acid powder additives have the ability to both lubricate and support large amounts of applied load. In order to develop the predictive capability for a journal bearing that is lubricated with an oil/boric acid mixture, a multi-phase simulation was created which used particle dynamics and computational fluid dynamics (CFD) modeling.
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Philipov, Svetlin. "CFD Analysis of Boron Distribution at Core Entrance in Case of Reverse Flow Induced From PRISE." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30410.

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Initiating events such as primary to secondary loss of coolant (PRISE) can lead to conditions forming reversed flow from the second to the primary circuit. Current issue shows the results of a CFD analysis of the distribution of boric acid on the entrance of the core in case of such reversed flow of coolant as a result of PRISE initiation event. Analyzed accident is included in the list of design basis accidents and requires precise approach in analyzing the phenomena associated with the possibility of injection of coolant with low concentration of boric acid in the primary side. The paper emphasizes on the application of CFD to solve the problem. Analyzing the accident is done in advance with the help of system code RELAP. The input data as flow rate, concentration and temperature at the inlet of the reactor is submitted as boundary conditions in FLUENT and boric acid mixing is analyzed to the core inlet.
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Kojo, Retsu, Akitoshi Hotta, Masahiro Furuya, Miyuki Akiba, and Harutaka Hoshi. "Detailed Observation of Seawater Precipitation With 5×5 Mockup Fuel Bundle Based on X-Ray Computated Tomography Technique." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30129.

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In order to conform to the new regulatory standard in Japan, seawater is regarded as the alternative water source both for BWRs (Boiling water reactors) and PWRs (Pressurized water reactors). For preventing further accident evolutions occurred in Fukushima Daiichi nuclear power plants, seawater was injected into the reactors for more than one week. With long-term seawater injection, sea salt compositions are condensed and many of them will precipitate when saturated concentrations are exceeded. Unlike corrosion issues, impacts of sea salt precipitation on the heat removal has not been studied widely in the past because it has not been regarded as the alternative water source before Fukushima Daiichi nuclear power plants accident. The existent knowledge base of boric acid precipitation under LOCA conditions was studied. Based on the existent study on impacts of boric acid precipitation under LOCA conditions, the experimental project of seawater consisting of four experiments was proposed. The existent database of physical properties, such as viscosity, of seawater is rather poor under severe accident conditions. In addition, it is likely that boric acid will be injected with water or seawater to prevent re-criticality. It is known that physical properties of boric acid vary widely under high temperature conditions. Measurement of viscosity of the seawater-boric acid mixture was conducted in high temperature using a rotational viscometer. Under conditions equivalent to the estimated bulk coolant conditions under a long-term cooling phase of severe accidents. In this range, no obvious change of viscosity is expected. Then a detailed structure of seawater precipitates was observed using a mockup fuel bundle with 5×5 in the square lattice and 500 mm in the length. Images of precipitates were taken using the X-ray CT. The water level, the concentration of sea salt and the heat flux are employed as experimental parameters. The heat flux, bubble stirring in downstream of spacers and heat loss by a non-heated channel box were identified as influential factors to local and overall precipitates in fuel bundles.
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Amaya, Miguel, Sang M. Kwark, Ajay Gurung, and Seung M. You. "Pool Boiling Heat Transfer of Borated (H3BO3) Water on a Nanoporous Surface." In ASME 2012 Third International Conference on Micro/Nanoscale Heat and Mass Transfer. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/mnhmt2012-75041.

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With regard to potential application in pressurized water reactors (PWRs), a nanoporous heated surface was tested in pool boiling of an aqueous solution of boric acid (H3BO3), or borated water (1% volume concentration). The effect of different system pressures and different surface orientations on pool boiling heat transfer was studied. The nanoporous surface consisted of a coating of alumina nanoparticles applied on a 1 cm2 flat copper surface through nanofluid boiling. An uncoated surface in borated water was similarly tested, and due to boric acid deposition, the boiling heat transfer (BHT) degraded and the critical heat flux (CHF) enhanced relative to pure water. Also, the possibility of transient pool boiling behavior of borated water was investigated but none was detected. For all pressures and orientations, the nanoporous surface further enhanced the CHF of borated water to the CHF produced by the nanoporous surface in pure water. Over the nanoporous surface, the CHF of borated water was increasingly better with decreasing pressure, than that over the plain surface. However, BHT degraded slightly further. Boric acid deposition over the nanoporous surface was believed to be the source of this BHT degradation, but played no apparent role in the further CHF enhancement.

Reports on the topic "Borinic acids":

1

Crapse, K., and E. Kyser. LITERATURE REVIEW OF BORIC ACID SOLUBILITY DATA. Office of Scientific and Technical Information (OSTI), September 2011. http://dx.doi.org/10.2172/1025802.

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Parada, Corey, Erica Redline, Benjamin Juba, Brynal Benally, Patricia Sawyer, Curtis Mowry, and William Corbin. Sustainable Functional Epoxies through Boric Acid Templating. Office of Scientific and Technical Information (OSTI), October 2021. http://dx.doi.org/10.2172/1829196.

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Pesce-Rodriguez, Rose. Solubility of RDX, PETN and Boric Acid in Methylene Chloride. Fort Belvoir, VA: Defense Technical Information Center, August 2010. http://dx.doi.org/10.21236/ada532998.

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Grossman-Canfield, N. Surface interactions of cesium and boric acid with stainless steel. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/97355.

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Czajkowski, C. Survey of boric acid corrosion of carbon steel components in nuclear plants. Office of Scientific and Technical Information (OSTI), June 1990. http://dx.doi.org/10.2172/6769556.

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Zhou, H., and P. Colombo. Solidification of low-level radioactive wastes in masonry cement. [Masonry cement-boric acid waste forms]. Office of Scientific and Technical Information (OSTI), March 1987. http://dx.doi.org/10.2172/6338376.

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Stone, M. PRELIMINARY EVALUATION OF DWPF IMPACTS OF BORIC ACID USE IN CESIUM STRIP FOR SWPF AND MCU. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/991221.

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Imrich, K. Corrosion resistance of inconel 690 to borax, boric acid, and boron nitride at 1100{degrees}C. Office of Scientific and Technical Information (OSTI), December 1996. http://dx.doi.org/10.2172/522764.

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Sopok, Samuel. Determination of Nickel, Nickel Chloride Hexahydrate and Boric Acid in Nickel Sulfamate Plating Solutions by Titration. Fort Belvoir, VA: Defense Technical Information Center, June 1991. http://dx.doi.org/10.21236/ada420005.

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Kyser, E. A. Purex Processing of Dissolved Sand, Slag, and Crucible Containing High Levels of Boric Acid and Calcium Fluoride. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/676796.

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