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Waseda University Nanotechnology Platform

The following is a translation of the report at the bottom of this page which was created by Waseda University in Japan based on tests of Dglass Coat.

Waseda University Nanotechnology Platform
Microfabrication Nanoplatform Consortium

Date: 2018/11/18

Person in charge: Toru Sasagawa

Research theme: Analysis of samples in iron ball drop test

Research outline (contents of request)
Perform an iron ball drop test on 10 prepared glass samples for each parameter. Excluding the highest and lowest values, an average was obtained for each based on 8 samples. This was then compared to untreated glass.

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Correspondence time and date: 2018/11/18

Confirmed/Sealed: Mizuno Ishikawa

The test piece is blue plate glass 2mm thick, 100mm in length and width. A minimum of 10 samples were used for each test. The average was obtained by excluding the highest and lowest results and averaging the 8 remaining samples. We also compared it to protective film sold at Docomo shops.

table-1 waseda


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Dglass Coating Fundamental TEM/EELS Observation Report

Fundamental TEM/EELS ( transmission electron microscope ) / (electron energy loss spectroscopy) observation report of Dglass Coat sample

National Institute of Advanced Industrial Science and Technology

Experiment purpose and methods

Conduct basic TEM / EELS observation of a cross section Dglass Coat polymer film and obtain insights on the toughness and mechanism of the film

Experimental procedure

  1. Coat a pure Fe thin plate: drip coating onto plate → spread with a microfiber cloth in a concentric motion → spray with pure water → repeat application two more times
  2. Etch obliquely using a focused ion beam (FIB) JIB-4000 (30 kV), creating a thin TEM sample (figure below)
  3. Transmission electron microscope (TEM) / electron energy loss spectrometer (EELS) Observation: FEI Tecnai G2 F30 (300kV) used, Gatan Enifina used for EELS, beam focusing diameter 0.7nnm, measurement shell, Sil2.3Ck, FEL2.3

Fe spectrum: Fe (iron) diffuses to the surface of Dglass Coat
Performs mutual ion exchange and sucks up molecules on the Fe plate.
Chemical bonding is accomplished with coating anchored to plate

Si spectrum: Glass containing SiO2 (silicon dioxide) was observed.
As in the case of the Fe spectrum, since the molecules are chemically bonded by their ion-exchanges with each other, it was observed that the concentration of the glass components increased in density from the bottom layer.

The ion exchange between the coating and the coated surface created a solid bond strengthening the material being coated.

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Osaka Institute of Technology Test of Dglass Coat

August 5, 2019

Test of the glass strengthening properties of the glass coating

Professor, Faculty of Engineering, Osaka Institute of Technology
Ide Nishikawa

The idea of using glass coating as a method to improve the impact resistance of the glass.

The purpose of this test is to quantitatively clarify whether the impact strength of glass is improved by Dglass Coat.

Test method
Commercially available float glass to be tested. The test pieces are 100mm x 100mm x 2mm thick float glass plates. The glass test plate referred to at the treated material will be coated with Dglass Coat. The plate without the coating applied will be referred to as untreated material.

Impact tester consisted of a stand with a 2 meter long pole with a diameter of 13mm. The instrument was created so that the magnetic portion of the magnetic stand was mounted facing down on the pole in a fixed position. This setup was to hold the iron balls with the magnet. The iron balls to be dropped consisted of martensite stainless steel SUS403 and weighed 64g and 95g respectively. The test stand was set up so that the balls would drop at the center of the test glass pieces. This base was made of an strong piece of 100mm x 100mm x 50mm S54C steel so that all the energy of the falling ball was transmitted to the glass. Therefore, by adjusting the drop height, it could be determined whether or not the test piece is destroyed by the energy of the drop.

Basically, each was to be tested with a falling energy of n∞5.

fig-1-and-2fig-3Test results

Results for the 64g iron ball drop test

Next, the results of the 95g iron ball drop test.

Using on the test results of Tables 1 to 4, the energy of the ball hitting the glass plate was determined by the following formula according to the height of the drop. The energy applied to the glass specimen was determined as being equal to the potential energy E of the iron ball.

E = mgh

Here, m is the mass (kg) of the iron ball, g is the gravitational acceleration of 9.80665 (m / s2), and h is the drop height (m).

The probability of the glass samples breaking from added energy is summarized respectively in tables 5-8.

Drop height (m) Energy E (J) Failure rate

Figures 4 and 5 summarize these results in the form of figures for each iron ball used in the test.

Using a 50% probability of failure rate from the energy of the impact, with the 64 gram iron ball, Fig. 4 shows that the fracture energy of the untreated material is approximately 0.155 (J) and the fracture energy of the treated material is 0.217 (J).

With the 95 gram iron ball, FIG. 5 shows the breaking energy of the untreated material is 0.105 (J) and the breaking energy of the treated material is 0.186 (J). When these results are combined, it shows that Dglass Coating coating on the glass plates improved the strength by about 1.4 times in the 64 g ball test and about 1.77 times in the 95 g ball test compared to the untreated material.

It was observed that Dglass Coat significantly improved the impact strength of the glass by about 1.4 to 1.7 times.