Materials Chemistry最新文献_第3页

Frittage des melanges pulverulents ternaires fer — chrome — manganese. Role exerce par l'atmosphere de traitement 铁-铬-锰三元粉末混合物的烧结。处理气氛所起的作用

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90065-7

D. Georgeault, R. Dessieux, G. Cizeron

引用次数: 0

Domaine vitreux et conductive ionique des verres du systeme AgPO3Ag2Se 你的系统可以追踪装置

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90074-8

G. Baud, J. Besse

引用次数: 0

Viscosity of dilute solutions of randomly branched poly (butyleneterephthalate) 随机支链聚对苯二甲酸丁二酯稀溶液的粘度

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90068-2

F. Pilati, A. Munari, P. Manaresi

引用次数: 3

Etude infrarouge des sites d'adsorption des alcools sur alumine 醇在氧化铝上吸附位点的红外研究

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90072-4

M Benaïssa, O Saur, J.-C Lavalley

{"title":"Etude infrarouge des sites d'adsorption des alcools sur alumine","authors":"M Benaïssa, O Saur, J.-C Lavalley","doi":"10.1016/0390-6035(82)90072-4","DOIUrl":"https://doi.org/10.1016/0390-6035(82)90072-4","url":null,"abstract":"<div>The adsorption of different alcohols ((CF3)3 COH, (CF3)2 CHOH, CF3 CH2 OH, CH3 OH) has been studied by gravimetry and infrared spectroscopy. Gravimetric results show that the irreversibly and reversibly adsorbed quantities increase with alcohols basicity. Infrared spectra of the irreversible species formed on alumina samples activated at 1120 K provide evidence for alcoholate species. Moreover additional species are present in the case of methanol and 2-propanol: they are coordinated to Lewis acid sites. The reversible species are mainly hydrogen bonded. Poisoning experiments with bases ((CH3)2 O and (CH3)3 CC ≡ N) lead us to conclude that the number of acid sites not involved in the irreversible adsorption of alcohols increases from (CH3)2 CHOH to (CF3)3 COH. Use of CD3 OCD2H shows that these unoccupied sites are strong Lewis acid ones. These results with those obtained from the coadsorption of two alcohols show the heterogeneity of alumina surface sites; basic O2− - weak Lewis acid Al3+ pair sites are involved in the adsorption of the different alcohols. Moreover the surface presents other sites such as O2+ — strong Lewis acid Al3+ pair sites or strong Lewis acid Al3+ sites which are also involved in the adsorption of alcohols with high pka.</div>","PeriodicalId":18221,"journal":{"name":"Materials Chemistry","volume":"7 5","pages":"Pages 699-714"},"PeriodicalIF":0.0,"publicationDate":"1982-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0390-6035(82)90072-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72114828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 9

Zur tribophysikalischen darstellung der magneto-ferroelektrischen emulsion 用于磁-铁电乳液的摩擦物理表示

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90075-X

S. Yamaguchi

引用次数: 2

The influence of concentration of ethylenediamine and acetate ions on the occurrence of underpotential effects in the system Cu(111)/Pb+2 乙二胺和乙酸离子浓度对Cu(111)/Pb+2体系中欠电位效应发生的影响

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90066-9

A. Budniok, J. Baranska

引用次数: 1

Randomly branched poly (butyleneterephthalate): Correlation between melt-flow index and branching parameters 随机支化聚(丁二对苯二甲酸酯):熔体流动指数与支化参数的相关性

Materials Chemistry Pub Date : 1982-09-01 DOI: 10.1016/0390-6035(82)90069-4

F. Pilati, A. Munari, P. Manaresi