Instrumental Methods of Chemical Analysis

Müller, Ralph H.

doi:10.1021/i560098a001

Cited by 37 publications

(9 citation statements)

References 166 publications

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“…Accordingly, 2 well‐defined peaks could be identified at low diffraction angle (2θ) values in the XR diffractograms of the control and DPNs crosslinked with CaCl 2 (Fig. B), located at 19.16 and 22.56 o , which are characteristic of the material's semi‐crystallinity …”

Section: Resultsmentioning

confidence: 97%

Gellan gum‐hydroxyapatite composite spongy‐like hydrogels for bone tissue engineering

Manda

Silva

Cerqueira

et al. 2017

J Biomedical Materials Res

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Osteoinductive biomaterials represent a promising approach to advance bone grafting. Despite promising, the combination of sustained biodegradability, mechanical strength, and biocompatibility in a unique biomaterial that can also support cell performance and bone formation in vivo is demanding. Herein, we developed gellan gum (GG)-hydroxyapatite (HAp) spongy-like hydrogels to mimic the organic (GG) and inorganic (HAp) phases of the bone. HAp was successfully introduced within the GG polymeric networks, as determined by FTIR and XRD, without compromising the thermostability of the biomaterials, as showed by TGA. The developed biomaterials showed sustained degradation, high swelling, pore sizes between 200 and 300 μm, high porosity (>90%) and interconnectivity (<60%) that was inversely proportional to the total polymeric amount and to CaCl crosslinker. CaCl and HAp reinforced the mechanical properties of the biomaterials from a storage modulus of 40 KPa to 70-80 KPa. This study also showed that HAp and CaCl favored the bioactivity and that cells were able to adhere and spread within the biomaterials up to 21 days of culture. Overall, the possibility to tailor spongy-like hydrogels properties by including calcium as a crosslinker and by varying the amount of HAp will further contribute to understand how these features influence bone cells performance in vitro and bone formation in vivo. © 2017 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 479-490, 2018.

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Section: Resultsmentioning

confidence: 97%

Gellan gum‐hydroxyapatite composite spongy‐like hydrogels for bone tissue engineering

Manda

Silva

Cerqueira

et al. 2017

J Biomedical Materials Res

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“…Numerous analytical devices utilizing the heat of catalytic conversion have been described in the literature and two excellent surveys on the subject have appeared (8,6). With instruments manufactured previously, only down to 0.01% of oxy'gen can be detected (3), which is rather insensitive.…”

Section: Selection Of Methodsmentioning

confidence: 99%

Instrument for Continuous Measurement of Low Concentrations of Oxygen in Gases

Cohn¹

1947

Anal. Chem.

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“…Hydrogen is then passed through it at a rate near 85 liters (3 cubic feet) per hour. While the hydrogen is flowing, occasional checks for hydrogen sulfide are made on the effluent from the hydrogenation tube with a Mine Safety Appliance Co. hydrogen sulfide detector tube (7) which may be inserted just ahead of flowmeter K. When a fresh detector tube shows practically no discoloration after a 5-minute exposure the silica gel may be considered free from sulfur and the purification procedure stopped. After cooling, the silica gel is sealed into glass tubes such as shown in Figure 1, A.…”

Section: Apparatusmentioning

confidence: 99%

“…THE use of "detergent" type additives in motor oils resulted in an increase in the bearing corrosion problem and it became necessary to develop a laboratory test that would predict the corrosive tendencies of these additives. The present study was undertaken with the objective of developing a laboratory corrosion test that could be correlated with the standard Chevrolet laboratory engine test (7). An attempt was made to incorporate into the test as many as possible of the factors that are responsible for the corrosion of bearings in engines.…”

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confidence: 99%